feat: add Wan2.2 S2V (audio+img-to-video) support (#1925)

Co-authored-by: leejet <leejet714@gmail.com>

docs/wan.md

@@ -34,6 +34,10 @@
         - Wan2.2 I2V A14B
             - safetensors: https://huggingface.co/Comfy-Org/Wan_2.2_ComfyUI_Repackaged/tree/main/split_files/diffusion_models
             - gguf: https://huggingface.co/QuantStack/Wan2.2-I2V-A14B-GGUF/tree/main
+        - Wan2.2 S2V 14B
+            - safetensors: https://huggingface.co/Comfy-Org/Wan_2.2_ComfyUI_Repackaged/tree/main/split_files/diffusion_models
+            - gguf: https://huggingface.co/QuantStack/Wan2.2-S2V-14B-GGUF/tree/main
+            - int8_convrot safetensors: https://huggingface.co/noctrex/Wan2.2-S2V-14B-int8_convrot
 - Download vae
     - wan_2.1_vae (for all the wan model except Wan2.2 TI2V 5B)
         - safetensors: https://huggingface.co/Comfy-Org/Wan_2.1_ComfyUI_repackaged/blob/main/split_files/vae/wan_2.1_vae.safetensors
@@ -49,6 +53,9 @@
 - Download clip_vison_h (for Wan2.1 I2V/FLF2V only)
     - safetensors: https://huggingface.co/Comfy-Org/Wan_2.1_ComfyUI_repackaged/blob/main/split_files/clip_vision/clip_vision_h.safetensors
 
+- Download audio_encoder (for Wan2.2 S2V only)
+    - safetensors: https://huggingface.co/Comfy-Org/Wan_2.2_ComfyUI_Repackaged/blob/main/split_files/audio_encoders/wav2vec2_large_english_fp16.safetensors
+
 
 ## Examples
 
@@ -94,6 +101,48 @@
 
 <video src=../assets/wan/Wan2.2_14B_i2v.mp4 controls="controls" muted="muted" type="video/mp4"></video>
 
+### Wan2.2 S2V 14B
+
+Audio-driven video (speech-to-video). The reference image (`-i`) is the speaker
+portrait, `--audio` is the driving audio track and `--audio-encoder` is the
+wav2vec2 audio encoder. Wan2.2 S2V requires the wan_2.1 vae (16 channel), not
+the wan2.2 vae.
+
+```
+.\bin\Release\sd-cli.exe -M vid_gen --diffusion-model  ..\models\diffusion_models\wan2.2_s2v-14B-Q8_0.gguf --audio-encoder ..\models\audio_encoders\wav2vec2_large_english_fp16.safetensors --vae ..\models\vae\wan_2.1_vae.safetensors --t5xxl ..\models\text_encoders\umt5-xxl-encoder-Q8_0.gguf  -p "a person is talking" --cfg-scale 6.0 --steps 20 --sampling-method euler -v -n "色调艳丽，过曝，静态，细节模糊不清，字幕，风格，作品，画作，画面，静止，整体发灰，最差质量，低质量，JPEG压缩残留，丑陋的，残缺的，多余的手指，画得不好的手部，画得不好的脸部，畸形的，毁容的，形态畸形的肢体，手指融合，静止不动的画面，杂乱的背景，三条腿，背景人很多，倒着走" -W 832 -H 480 --diffusion-fa --offload-to-cpu --vae-tiling --video-frames 81 -i ..\assets\cat_with_sd_cpp_42.png --audio .\input\speech.wav --flow-shift 3.0
+```
+
+Notes:
+
+- Recommended settings: `--sampling-method euler --steps 20 --cfg-scale 6.0`.
+  `dpm++2m` produces heavy artifacts on S2V. 4 steps with the lightning LoRA
+  (below) is the fast option.
+- Resolutions: width and height must be multiples of 16; the examples use
+  multiples of 64. 832x480 is a fast starting point; generation cost scales
+  with pixel area.
+- `--audio` accepts a WAV file; it is downmixed to mono and resampled to 16 kHz
+  internally. Audio longer than the video is truncated, video longer than the
+  audio is padded with silence. Pick `--video-frames` to match the audio:
+  roughly `audio_seconds * 16` frames, capped at one chunk (77-81 frames,
+  ~5 s at the model's 16 fps). 33, 77 and 81 map to clean latent frame counts.
+- S2V always uses 16 fps. Other requested frame rates are automatically
+  changed to 16 with a warning, including the CLI and server video output.
+  `generate_video()` returns the actual frame rate through `fps_out`; C API
+  callers should use that value when encoding the output video.
+- One generation covers the first S2V chunk window (`--video-frames` frames).
+  Long-video chunked extend mode is not implemented yet.
+- Speed: the lightx2v lightning LoRA works with S2V at 4 steps and
+  `--cfg-scale 1.0`. Use the **low_noise** variant;
+  the high_noise variant produces artifacts on S2V:
+
+  ```
+  --lora-model-dir ..\models\loras
+  -p "...<lora:lightx2v-Wan2.2-T2V-A14B-4steps-lora-rank64-Seko-V2.0-low_noise:1.0>"
+  --cfg-scale 1.0 --steps 4
+  ```
+
+  Expect some quality/dynamics loss compared to the full 20-step run.
+
 ### Wan2.2 T2V A14B T2I
 
 ```

examples/cli/main.cpp

@@ -419,7 +419,8 @@ void step_callback(int step, int frame_count, sd_image_t* image, bool is_noisy,
             LOG_ERROR("save preview image to '%s' failed", path.string().c_str());
         }
     } else {
-        if (create_video_from_sd_images(cli_params->preview_path.c_str(), image, frame_count, cli_params->preview_fps, cli_params->compression_quality) != 0) {
+        int fps = cli_params->preview_method == PREVIEW_PROJ ? cli_params->preview_fps / 4 : cli_params->preview_fps;
+        if (create_video_from_sd_images(cli_params->preview_path.c_str(), image, frame_count, fps, cli_params->compression_quality) != 0) {
             LOG_ERROR("save preview video to '%s' failed", cli_params->preview_path.c_str());
         }
     }
@@ -687,8 +688,6 @@ int main(int argc, const char* argv[]) {
         }
     }
     cli_params.preview_fps = gen_params.fps;
-    if (cli_params.preview_method == PREVIEW_PROJ)
-        cli_params.preview_fps /= 4;
 
     sd_set_preview_callback(step_callback,
                             cli_params.preview_method,
@@ -951,9 +950,10 @@ int main(int argc, const char* argv[]) {
         } else if (cli_params.mode == VID_GEN) {
             sd_vid_gen_params_t vid_gen_params = gen_params.to_sd_vid_gen_params_t();
             sd_image_t* generated_video        = nullptr;
-            if (!generate_video(sd_ctx.get(), &vid_gen_params, &generated_video, &num_results, &generated_audio)) {
+            if (!generate_video(sd_ctx.get(), &vid_gen_params, &generated_video, &num_results, &generated_audio, &cli_params.preview_fps)) {
                 generated_video = nullptr;
             }
+            gen_params.fps = cli_params.preview_fps;
             results.adopt(generated_video, num_results);
         }
 

examples/common/common.cpp

@@ -460,6 +460,11 @@ ArgOptions SDContextParams::get_options() {
          "path to standalone LTX audio vae model",
          0,
          &audio_vae_path},
+        {"",
+         "--audio-encoder",
+         "path to wav2vec2 audio encoder model (Wan2.2 S2V)",
+         0,
+         &audio_encoder_path},
         {"",
          "--taesd",
          "path to taesd. Using Tiny AutoEncoder for fast decoding (low quality)",
@@ -898,6 +903,7 @@ std::string SDContextParams::to_string() const {
         << "  vae_path: \"" << vae_path << "\",\n"
         << "  vae_format: \"" << vae_format << "\",\n"
         << "  audio_vae_path: \"" << audio_vae_path << "\",\n"
+        << "  audio_encoder_path: \"" << audio_encoder_path << "\",\n"
         << "  taesd_path: \"" << taesd_path << "\",\n"
         << "  esrgan_path: \"" << esrgan_path << "\",\n"
         << "  control_net_path: \"" << control_net_path << "\",\n"
@@ -963,6 +969,7 @@ sd_ctx_params_t SDContextParams::to_sd_ctx_params_t(bool taesd_preview) {
     sd_ctx_params.embeddings_connectors_path      = embeddings_connectors_path.c_str();
     sd_ctx_params.vae_path                        = vae_path.c_str();
     sd_ctx_params.audio_vae_path                  = audio_vae_path.c_str();
+    sd_ctx_params.audio_encoder_path              = audio_encoder_path.c_str();
     sd_ctx_params.taesd_path                      = taesd_path.c_str();
     sd_ctx_params.control_net_path                = control_net_path.c_str();
     sd_ctx_params.ip_adapter_path                 = ip_adapter_path.c_str();
@@ -1515,6 +1522,14 @@ ArgOptions SDGenerationParams::get_options() {
         return 1;
     };
 
+    auto on_audio_arg = [&](int argc, const char** argv, int index) {
+        if (++index >= argc) {
+            return -1;
+        }
+        ref_audio_paths.push_back(argv[index]);
+        return 1;
+    };
+
     auto on_cache_mode_arg = [&](int argc, const char** argv, int index) {
         if (++index >= argc) {
             return -1;
@@ -1704,6 +1719,10 @@ ArgOptions SDGenerationParams::get_options() {
          "--ref-audio",
          "standalone WAV reference for MiniMax-H3 Ref2VA (can be used multiple times)",
          on_ref_audio_arg},
+        {"",
+         "--audio",
+         "driving audio track (Wan2.2 S2V; can be used once)",
+         on_audio_arg},
         {"",
          "--cache-mode",
          "caching method: 'easycache' (DiT), 'ucache' (UNET), 'dbcache'/'taylorseer'/'cache-dit' (DiT block-level), 'spectrum' (UNET/DiT Chebyshev+Taylor forecasting)",

examples/common/common.h

@@ -131,6 +131,7 @@ struct SDContextParams {
     std::string vae_path;
     std::string vae_format = "auto";
     std::string audio_vae_path;
+    std::string audio_encoder_path;
     std::string taesd_path;
     std::string esrgan_path;
     std::string control_net_path;

examples/server/async_jobs.cpp

@@ -245,7 +245,7 @@ bool execute_vid_gen_job(ServerRuntime& runtime,
     {
         std::lock_guard<std::mutex> lock(*runtime.sd_ctx_mutex);
         sd_image_t* raw_results = nullptr;
-        if (!generate_video(runtime.sd_ctx, &params, &raw_results, &num_results, &generated_audio)) {
+        if (!generate_video(runtime.sd_ctx, &params, &raw_results, &num_results, &generated_audio, &output_fps)) {
             raw_results = nullptr;
         }
         results.adopt(raw_results, num_results);
@@ -261,7 +261,7 @@ bool execute_vid_gen_job(ServerRuntime& runtime,
     std::vector<uint8_t> video_bytes = create_video_from_sd_images_to_vector(job.vid_gen.output_format,
                                                                              results.data(),
                                                                              num_results,
-                                                                             job.vid_gen.gen_params.fps,
+                                                                             output_fps,
                                                                              job.vid_gen.output_compression,
                                                                              generated_audio);
     free_sd_audio(generated_audio);
@@ -273,7 +273,6 @@ bool execute_vid_gen_job(ServerRuntime& runtime,
     output_media_b64       = base64_encode(video_bytes);
     output_media_mime_type = video_mime_type(job.vid_gen.output_format);
     output_frame_count     = num_results;
-    output_fps             = job.vid_gen.gen_params.fps;
     return true;
 }
 

include/stable-diffusion.h

@@ -208,6 +208,7 @@ typedef struct {
     const char* embeddings_connectors_path;
     const char* vae_path;
     const char* audio_vae_path;
+    const char* audio_encoder_path;
     const char* taesd_path;
     const char* control_net_path;
     const char* ip_adapter_path;
@@ -521,11 +522,13 @@ enum sd_cancel_mode_t {
 SD_API void sd_cancel_generation(sd_ctx_t* sd_ctx, enum sd_cancel_mode_t mode);
 
 SD_API void sd_vid_gen_params_init(sd_vid_gen_params_t* sd_vid_gen_params);
+// If non-NULL, fps_out receives the effective encoding frame rate before preview callbacks.
 SD_API bool generate_video(sd_ctx_t* sd_ctx,
                            const sd_vid_gen_params_t* sd_vid_gen_params,
                            sd_image_t** frames_out,
                            int* num_frames_out,
-                           sd_audio_t** audio_out);
+                           sd_audio_t** audio_out,
+                           int* fps_out);
 
 typedef struct upscaler_ctx_t upscaler_ctx_t;
 

src/conditioning/wan_audio.cpp

@@ -0,0 +1,103 @@
+#include "wan_audio.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+
+namespace sd::wan_audio {
+
+    static BucketPlan plan_buckets(int audio_frames, int batch_frames, int video_rate, int fps) {
+        BucketPlan plan;
+        plan.audio_frames  = audio_frames;
+        plan.batch_frames  = batch_frames;
+        plan.video_rate    = video_rate;
+        plan.fps           = fps;
+        const double scale = static_cast<double>(video_rate) / fps;
+        // Keep a trailing chunk even when audio ends on a chunk boundary.
+        plan.num_chunks          = static_cast<int>(audio_frames / (batch_frames * scale)) + 1;
+        plan.bucket_frames       = plan.num_chunks * batch_frames;
+        plan.padded_audio_frames = static_cast<int>(
+            std::ceil(plan.bucket_frames / static_cast<double>(fps) * video_rate));
+        return plan;
+    }
+
+    // Match NumPy's round-half-even sampling.
+    static int bucket_source_frame(int bucket_frame, int video_rate, int fps) {
+        return static_cast<int>(std::nearbyint(static_cast<double>(bucket_frame) * video_rate / fps));
+    }
+
+    static int interpolated_frame_count(int in_frames, int input_fps, int output_fps) {
+        return static_cast<int>(in_frames / static_cast<double>(input_fps) * output_fps);
+    }
+
+    // Match PyTorch linear interpolation with align_corners=True.
+    static std::vector<float> linear_interpolate_frames(const std::vector<float>& in,
+                                                        int num_layers,
+                                                        int in_frames,
+                                                        int dim,
+                                                        int out_frames) {
+        std::vector<float> out(static_cast<size_t>(num_layers) * out_frames * dim, 0.0f);
+        if (in.empty() || in_frames <= 0 || out_frames <= 0 || num_layers <= 0 || dim <= 0) {
+            return out;
+        }
+        const double scale = out_frames > 1 ? static_cast<double>(in_frames - 1) / (out_frames - 1) : 0.0;
+        for (int layer = 0; layer < num_layers; ++layer) {
+            for (int out_i = 0; out_i < out_frames; ++out_i) {
+                const double pos     = out_i * scale;
+                const int src0       = static_cast<int>(pos);
+                const int src1       = std::min(src0 + 1, in_frames - 1);
+                const float frac     = static_cast<float>(pos - src0);
+                const float* in_row  = &in[(static_cast<size_t>(layer) * in_frames + src0) * dim];
+                const float* in_next = &in[(static_cast<size_t>(layer) * in_frames + src1) * dim];
+                float* out_row       = &out[(static_cast<size_t>(layer) * out_frames + out_i) * dim];
+                for (int d = 0; d < dim; ++d) {
+                    out_row[d] = in_row[d] * (1.0f - frac) + in_next[d] * frac;
+                }
+            }
+        }
+        return out;
+    }
+
+    std::vector<float> build_audio_buckets(const float* stacked_states,
+                                           int num_layers,
+                                           int in_frames,
+                                           int dim,
+                                           int batch_frames,
+                                           BucketPlan* plan_out,
+                                           int input_fps,
+                                           int video_rate,
+                                           int fps) {
+        if (stacked_states == nullptr || num_layers <= 0 || in_frames <= 0 || dim <= 0 || batch_frames <= 0) {
+            return {};
+        }
+        const int audio_frames = interpolated_frame_count(in_frames, input_fps, video_rate);
+        if (audio_frames <= 0) {
+            return {};
+        }
+        const std::vector<float> interpolated =
+            linear_interpolate_frames(std::vector<float>(stacked_states,
+                                                         stacked_states + static_cast<size_t>(num_layers) * in_frames * dim),
+                                      num_layers,
+                                      in_frames,
+                                      dim,
+                                      audio_frames);
+        const BucketPlan plan = plan_buckets(audio_frames, batch_frames, video_rate, fps);
+        if (plan_out != nullptr) {
+            *plan_out = plan;
+        }
+        std::vector<float> buckets(static_cast<size_t>(plan.bucket_frames) * num_layers * dim, 0.0f);
+        for (int frame = 0; frame < plan.bucket_frames; ++frame) {
+            const int src = bucket_source_frame(frame, video_rate, fps);
+            if (src >= plan.audio_frames) {
+                continue;
+            }
+            for (int layer = 0; layer < num_layers; ++layer) {
+                std::copy_n(interpolated.data() + (static_cast<size_t>(layer) * audio_frames + src) * dim,
+                            static_cast<size_t>(dim),
+                            buckets.data() + (static_cast<size_t>(frame) * num_layers + layer) * dim);
+            }
+        }
+        return buckets;
+    }
+
+}  // namespace sd::wan_audio

src/conditioning/wan_audio.h

@@ -0,0 +1,32 @@
+#ifndef __SD_CONDITIONING_WAN_AUDIO_H__
+#define __SD_CONDITIONING_WAN_AUDIO_H__
+
+#include <vector>
+
+namespace sd::wan_audio {
+
+    struct BucketPlan {
+        int audio_frames;  // frames at video_rate
+        int batch_frames;  // latent_t * 4
+        int video_rate;
+        int fps;         // bucket frame rate
+        int num_chunks;  // includes trailing padding
+        int bucket_frames;
+        int padded_audio_frames;
+    };
+
+    // [layers, frames, dim] at input_fps -> [bucket_frames, layers, dim] at fps.
+    // Pads past the audio end; returns an empty vector on invalid input.
+    std::vector<float> build_audio_buckets(const float* stacked_states,
+                                           int num_layers,
+                                           int in_frames,
+                                           int dim,
+                                           int batch_frames,
+                                           BucketPlan* plan_out = nullptr,
+                                           int input_fps        = 50,
+                                           int video_rate       = 30,
+                                           int fps              = 16);
+
+}  // namespace sd::wan_audio
+
+#endif  // __SD_CONDITIONING_WAN_AUDIO_H__

src/core/ggml_extend.cpp

@@ -325,6 +325,76 @@ ggml_tensor* ggml_ext_pad(ggml_context* ctx,
     return ggml_ext_pad_ext(ctx, nullptr, x, 0, p0, 0, p1, 0, p2, 0, p3, circular_x, circular_y);
 }
 
+static ggml_tensor* conv_1d(ggml_context* ctx, ggml_tensor* x, ggml_tensor* w, int s0, int p0, int d0, bool force_prec_f32) {
+    ggml_tensor* result;
+    if (force_prec_f32) {
+        ggml_tensor* patches = ggml_im2col(ctx, w, x, s0, 0, p0, 0, d0, 0, false, GGML_TYPE_F32);
+        result               = ggml_mul_mat(ctx,
+                                            ggml_reshape_2d(ctx, patches, patches->ne[0], patches->ne[2] * patches->ne[1]),
+                                            ggml_reshape_2d(ctx, w, w->ne[0] * w->ne[1], w->ne[2]));
+        result               = ggml_reshape_3d(ctx, result, patches->ne[1], w->ne[2], patches->ne[2]);
+    } else {
+        result = ggml_conv_1d(ctx, w, x, s0, p0, d0);
+    }
+    if (x->ne[2] > 1) {
+        // mul_mat packs positions and batches before output channels: [OL, N, OC].
+        result = ggml_reshape_3d(ctx, result, result->ne[0], x->ne[2], w->ne[2]);
+        result = ggml_cont(ctx, ggml_permute(ctx, result, 0, 2, 1, 3));
+    }
+    return result;
+}
+
+ggml_tensor* ggml_ext_conv_1d(ggml_context* ctx,
+                              ggml_tensor* x,
+                              ggml_tensor* w,
+                              ggml_tensor* b,
+                              int s0,
+                              int p0,
+                              int d0,
+                              int64_t groups,
+                              bool force_prec_f32) {
+    GGML_ASSERT(s0 > 0 && p0 >= 0 && d0 > 0 && groups > 0);
+    GGML_ASSERT(x->type == GGML_TYPE_F32 && x->ne[3] == 1 && w->ne[3] == 1);
+    GGML_ASSERT(x->ne[1] % groups == 0 && w->ne[2] % groups == 0);
+    GGML_ASSERT(w->ne[1] == x->ne[1] / groups);
+    GGML_ASSERT(b == nullptr || (b->type == GGML_TYPE_F32 && ggml_is_vector(b) && b->ne[0] == w->ne[2]));
+
+    // im2col requires contiguous time rows; group views must retain the real channel and batch strides.
+    if (!ggml_is_contiguous(x)) {
+        x = ggml_cont(ctx, x);
+    }
+    if (force_prec_f32 && w->type != GGML_TYPE_F32) {
+        w = ggml_cast(ctx, w, GGML_TYPE_F32);
+    }
+    if (!ggml_is_contiguous(w)) {
+        w = ggml_cont(ctx, w);
+    }
+
+    ggml_tensor* result = nullptr;
+    if (groups == 1) {
+        result = conv_1d(ctx, x, w, s0, p0, d0, force_prec_f32);
+    } else {
+        const int64_t ic_g = x->ne[1] / groups;
+        const int64_t oc_g = w->ne[2] / groups;
+        std::vector<ggml_tensor*> outputs;
+        outputs.reserve(groups);
+        for (int64_t group = 0; group < groups; ++group) {
+            ggml_tensor* x_i = ggml_view_3d(ctx, x, x->ne[0], ic_g, x->ne[2], x->nb[1], x->nb[2], group * ic_g * x->nb[1]);
+            ggml_tensor* w_i = ggml_view_3d(ctx, w, w->ne[0], ic_g, oc_g, w->nb[1], w->nb[2], group * oc_g * w->nb[2]);
+            outputs.push_back(conv_1d(ctx, x_i, w_i, s0, p0, d0, force_prec_f32));
+        }
+        result = ggml_ext_vec_concat(ctx, outputs, 1);
+    }
+    if (b != nullptr) {
+        if (!ggml_is_contiguous(b)) {
+            b = ggml_cont(ctx, b);
+        }
+        b      = ggml_reshape_3d(ctx, b, 1, w->ne[2], 1);
+        result = ggml_add_inplace(ctx, result, b);
+    }
+    return result;
+}
+
 ggml_tensor* ggml_ext_conv_2d(ggml_context* ctx,
                               ggml_tensor* x,
                               ggml_tensor* w,
@@ -683,17 +753,16 @@ ggml_tensor* ggml_ext_group_norm(ggml_context* ctx,
                                  ggml_tensor* x,
                                  ggml_tensor* w,
                                  ggml_tensor* b,
-                                 int num_groups) {
+                                 int num_groups,
+                                 float eps) {
     if (ggml_n_dims(x) >= 3 && w != nullptr && b != nullptr) {
         w = ggml_reshape_4d(ctx, w, 1, 1, w->ne[0], 1);
         b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
     }
 
-    const float eps = 1e-6f;  // default eps parameter
-    x               = ggml_group_norm(ctx, x, num_groups, eps);
+    x = ggml_group_norm(ctx, x, num_groups, eps);
     if (w != nullptr && b != nullptr) {
         x = ggml_mul_inplace(ctx, x, w);
-        // b = ggml_repeat(ctx, b, x);
         x = ggml_add_inplace(ctx, x, b);
     }
     return x;

src/core/ggml_extend.h

@@ -103,6 +103,18 @@ ggml_tensor* ggml_ext_pad(ggml_context* ctx,
                           bool circular_x = false,
                           bool circular_y = false);
 
+// ggml layout: x [L, IC, N], w [K, IC/groups, OC], b [OC], result [OL, OC, N].
+// force_prec_f32 keeps both input patches and weights in F32.
+ggml_tensor* ggml_ext_conv_1d(ggml_context* ctx,
+                              ggml_tensor* x,
+                              ggml_tensor* w,
+                              ggml_tensor* b,
+                              int s0              = 1,
+                              int p0              = 0,
+                              int d0              = 1,
+                              int64_t groups      = 1,
+                              bool force_prec_f32 = false);
+
 // w: [OC，IC, KH, KW]
 // x: [N, IC, IH, IW]
 // b: [OC,]
@@ -219,7 +231,8 @@ ggml_tensor* ggml_ext_group_norm(ggml_context* ctx,
                                  ggml_tensor* x,
                                  ggml_tensor* w,
                                  ggml_tensor* b,
-                                 int num_groups = 32);
+                                 int num_groups = 32,
+                                 float eps      = 1e-6f);
 
 ggml_tensor* ggml_ext_timestep_embedding(
     ggml_context* ctx,

src/core/ggml_extend_backend.cpp

@@ -87,6 +87,10 @@ static bool parse_backend_module(const std::string& raw_name, SDBackendModule* m
         *module = SDBackendModule::DETECTOR;
         return true;
     }
+    if (name == "audioencoder" || name == "audio") {
+        *module = SDBackendModule::AUDIO_ENCODER;
+        return true;
+    }
     return false;
 }
 
@@ -968,6 +972,8 @@ const char* sd_backend_module_name(SDBackendModule module) {
             return "upscaler";
         case SDBackendModule::DETECTOR:
             return "detector";
+        case SDBackendModule::AUDIO_ENCODER:
+            return "audio_encoder";
     }
     return "unknown";
 }

src/core/ggml_extend_backend.h

@@ -21,6 +21,7 @@ enum class SDBackendModule {
     PHOTOMAKER,
     UPSCALER,
     DETECTOR,
+    AUDIO_ENCODER,
 };
 
 struct SDBackendAssignment {

src/model.h

@@ -35,6 +35,7 @@ enum SDVersion {
     VERSION_WAN2,
     VERSION_WAN2_2_I2V,
     VERSION_WAN2_2_TI2V,
+    VERSION_WAN2_2_S2V,
     VERSION_LINGBOT_VIDEO,
     VERSION_QWEN_IMAGE,
     VERSION_QWEN_IMAGE_LAYERED,
@@ -130,7 +131,7 @@ static inline bool sd_version_is_minimax_h3(SDVersion version) {
 }
 
 static inline bool sd_version_is_wan(SDVersion version) {
-    if (version == VERSION_WAN2 || version == VERSION_WAN2_2_I2V || version == VERSION_WAN2_2_TI2V) {
+    if (version == VERSION_WAN2 || version == VERSION_WAN2_2_I2V || version == VERSION_WAN2_2_TI2V || version == VERSION_WAN2_2_S2V) {
         return true;
     }
     return false;

src/model/audio/wav2vec2.hpp

@@ -0,0 +1,413 @@
+#ifndef __SD_MODEL_AUDIO_WAV2VEC2_HPP__
+#define __SD_MODEL_AUDIO_WAV2VEC2_HPP__
+
+#include <algorithm>
+#include <cinttypes>
+#include <cmath>
+#include <cstdio>
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "core/ggml_extend.h"
+#include "core/ggml_runner.h"
+#include "model.h"
+#include "model/common/ggml_block.hpp"
+
+namespace Wav2Vec2 {
+
+    struct Wav2Vec2Config {
+        int64_t embed_dim             = 1024;
+        int64_t conv_dim              = 512;
+        int num_heads                 = 16;
+        int num_layers                = 24;
+        std::string feat_extract_norm = "layer";
+        bool conv_bias                = true;
+        bool do_normalize             = true;
+        bool do_stable_layer_norm     = true;
+
+        static Wav2Vec2Config detect_from_weights(const String2TensorStorage& tensor_storage_map, const std::string& prefix) {
+            Wav2Vec2Config config;
+            auto it = tensor_storage_map.find(prefix + "encoder.layer_norm.bias");
+            if (it == tensor_storage_map.end()) {
+                LOG_WARN("wav2vec2: %sencoder.layer_norm.bias not found, using large defaults", prefix.c_str());
+                return config;
+            }
+            config.embed_dim = it->second.ne[0];
+            if (config.embed_dim == 1024) {
+                config.embed_dim            = 1024;
+                config.num_heads            = 16;
+                config.num_layers           = 24;
+                config.feat_extract_norm    = "layer";
+                config.conv_bias            = true;
+                config.do_normalize         = true;
+                config.do_stable_layer_norm = true;
+            } else if (config.embed_dim == 768) {
+                config.embed_dim            = 768;
+                config.num_heads            = 12;
+                config.num_layers           = 12;
+                config.feat_extract_norm    = "group";
+                config.conv_bias            = false;
+                config.do_normalize         = false;
+                config.do_stable_layer_norm = false;
+            } else {
+                LOG_WARN("wav2vec2: unsupported embed_dim %" PRId64 ", using large defaults", config.embed_dim);
+                config.embed_dim = 1024;
+            }
+            return config;
+        }
+    };
+
+    struct Wav2Vec2NoLayerNormConvLayer : public UnaryBlock {
+        Wav2Vec2NoLayerNormConvLayer(int64_t in_channels, int64_t out_channels, int kernel_size, int stride, bool bias) {
+            blocks["conv"] = std::make_shared<Conv1d>(in_channels, out_channels, kernel_size, stride, 0, 1, 1, bias, true);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            auto conv = std::dynamic_pointer_cast<Conv1d>(blocks["conv"]);
+            x         = conv->forward(ctx, x);
+            return ggml_gelu_erf_inplace(ctx->ggml_ctx, ggml_ext_cont(ctx->ggml_ctx, x));
+        }
+    };
+
+    struct Wav2Vec2LayerNormConvLayer : public UnaryBlock {
+        Wav2Vec2LayerNormConvLayer(int64_t in_channels, int64_t out_channels, int kernel_size, int stride, bool bias) {
+            blocks["conv"]       = std::make_shared<Conv1d>(in_channels, out_channels, kernel_size, stride, 0, 1, 1, bias, true);
+            blocks["layer_norm"] = std::make_shared<LayerNorm>(out_channels);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            auto conv       = std::dynamic_pointer_cast<Conv1d>(blocks["conv"]);
+            auto layer_norm = std::dynamic_pointer_cast<LayerNorm>(blocks["layer_norm"]);
+            x               = conv->forward(ctx, x);
+            // LayerNorm normalizes channels: [N, C, L] -> [N, L, C].
+            x = ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3);
+            x = layer_norm->forward(ctx, x);
+            x = ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3);
+            return ggml_gelu_erf_inplace(ctx->ggml_ctx, ggml_ext_cont(ctx->ggml_ctx, x));
+        }
+    };
+
+    struct Wav2Vec2GroupNormConvLayer : public UnaryBlock {
+        Wav2Vec2GroupNormConvLayer(int64_t in_channels, int64_t out_channels, int kernel_size, int stride, bool bias) {
+            blocks["conv"]       = std::make_shared<Conv1d>(in_channels, out_channels, kernel_size, stride, 0, 1, 1, bias, true);
+            blocks["layer_norm"] = std::make_shared<GroupNorm>((int)out_channels, out_channels, 1e-05f);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            auto conv       = std::dynamic_pointer_cast<Conv1d>(blocks["conv"]);
+            auto layer_norm = std::dynamic_pointer_cast<GroupNorm>(blocks["layer_norm"]);
+            x               = conv->forward(ctx, x);
+            // ggml GroupNorm needs [N, C, H, W], with H=1 for audio.
+            x = ggml_reshape_4d(ctx->ggml_ctx, x, x->ne[0], 1, x->ne[1], x->ne[2]);
+            x = layer_norm->forward(ctx, x);
+            x = ggml_reshape_3d(ctx->ggml_ctx, x, x->ne[0], x->ne[2], x->ne[3]);
+            return ggml_gelu_erf_inplace(ctx->ggml_ctx, ggml_ext_cont(ctx->ggml_ctx, x));
+        }
+    };
+
+    struct Wav2Vec2FeatureEncoder : public UnaryBlock {
+        Wav2Vec2FeatureEncoder(const Wav2Vec2Config& config) {
+            GGML_ASSERT(config.feat_extract_norm == "layer" || config.feat_extract_norm == "group");
+            const int kernels[7] = {10, 3, 3, 3, 3, 2, 2};
+            const int strides[7] = {5, 2, 2, 2, 2, 2, 2};
+            int64_t in_channels  = 1;
+            for (int i = 0; i < 7; ++i) {
+                const std::string name = "conv_layers." + std::to_string(i);
+                if (config.feat_extract_norm == "layer") {
+                    blocks[name] = std::make_shared<Wav2Vec2LayerNormConvLayer>(in_channels, config.conv_dim, kernels[i], strides[i], config.conv_bias);
+                } else if (i == 0) {
+                    blocks[name] = std::make_shared<Wav2Vec2GroupNormConvLayer>(in_channels, config.conv_dim, kernels[i], strides[i], config.conv_bias);
+                } else {
+                    blocks[name] = std::make_shared<Wav2Vec2NoLayerNormConvLayer>(in_channels, config.conv_dim, kernels[i], strides[i], config.conv_bias);
+                }
+                in_channels = config.conv_dim;
+            }
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            for (int i = 0; i < 7; ++i) {
+                auto conv = std::dynamic_pointer_cast<UnaryBlock>(blocks["conv_layers." + std::to_string(i)]);
+                x         = conv->forward(ctx, x);
+            }
+            return ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3);
+        }
+    };
+
+    struct Wav2Vec2FeatureProjection : public UnaryBlock {
+        Wav2Vec2FeatureProjection(const Wav2Vec2Config& config) {
+            blocks["layer_norm"] = std::make_shared<LayerNorm>(config.conv_dim);
+            blocks["projection"] = std::make_shared<Linear>(config.conv_dim, config.embed_dim);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) {
+            auto ln         = std::dynamic_pointer_cast<LayerNorm>(blocks["layer_norm"]);
+            auto projection = std::dynamic_pointer_cast<Linear>(blocks["projection"]);
+            x               = ln->forward(ctx, x);
+            x               = projection->forward(ctx, x);
+            return x;
+        }
+    };
+
+    class Wav2Vec2PositionalConvEmbedding : public UnaryBlock {
+    private:
+        int64_t embed_dim_;
+        static constexpr int groups_      = 16;
+        static constexpr int kernel_size_ = 128;
+        std::string weight_g_name_;
+        std::string weight_v_name_;
+
+        ggml_tensor* weight(GGMLRunnerContext* ctx) {
+            auto g       = params[weight_g_name_];
+            auto v       = ggml_cast(ctx->ggml_ctx, params[weight_v_name_], GGML_TYPE_F32);
+            auto squared = ggml_mul(ctx->ggml_ctx, v, v);
+            // PyTorch weight_norm(dim=2) reduces both channel axes, retaining each kernel tap.
+            squared   = ggml_cont(ctx->ggml_ctx, ggml_permute(ctx->ggml_ctx, squared, 2, 0, 1, 3));
+            squared   = ggml_reshape_2d(ctx->ggml_ctx, squared, embed_dim_ / groups_ * embed_dim_, kernel_size_);
+            auto norm = ggml_sqrt(ctx->ggml_ctx, ggml_sum_rows(ctx->ggml_ctx, squared));
+            norm      = ggml_reshape_3d(ctx->ggml_ctx, norm, kernel_size_, 1, 1);
+            return ggml_mul(ctx->ggml_ctx, v, ggml_div(ctx->ggml_ctx, g, norm));
+        }
+
+    public:
+        Wav2Vec2PositionalConvEmbedding(const Wav2Vec2Config& config)
+            : embed_dim_(config.embed_dim) {
+            GGML_ASSERT(embed_dim_ > 0 && embed_dim_ % groups_ == 0);
+        }
+
+        void init_params(ggml_context* ctx, const String2TensorStorage& tensor_storage_map = {}, const std::string prefix = "") override {
+            bool legacy    = tensor_storage_map.count(prefix + "conv.weight_g") > 0;
+            weight_g_name_ = legacy ? "conv.weight_g" : "conv.parametrizations.weight.original0";
+            weight_v_name_ = legacy ? "conv.weight_v" : "conv.parametrizations.weight.original1";
+            auto g         = tensor_storage_map.find(prefix + weight_g_name_);
+            auto v         = tensor_storage_map.find(prefix + weight_v_name_);
+            GGML_ASSERT(g != tensor_storage_map.end() && v != tensor_storage_map.end());
+            GGML_ASSERT(g->second.ne[0] == kernel_size_ && g->second.ne[1] == 1 && g->second.ne[2] == 1 && g->second.ne[3] == 1);
+            GGML_ASSERT(v->second.ne[0] == kernel_size_ && v->second.ne[1] == embed_dim_ / groups_ && v->second.ne[2] == embed_dim_ && v->second.ne[3] == 1);
+
+            params[weight_g_name_] = ggml_new_tensor_3d(ctx, GGML_TYPE_F32, kernel_size_, 1, 1);
+            params[weight_v_name_] = ggml_new_tensor_3d(ctx, get_type(prefix + weight_v_name_, tensor_storage_map, GGML_TYPE_F16),
+                                                        kernel_size_, embed_dim_ / groups_, embed_dim_);
+            if (tensor_storage_map.count(prefix + "conv.bias") > 0) {
+                params["conv.bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, embed_dim_);
+            }
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            auto w = weight(ctx);
+            auto b = params.count("conv.bias") > 0 ? params["conv.bias"] : nullptr;
+            x      = ggml_cont(ctx->ggml_ctx, ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3));
+            x      = ggml_ext_conv_1d(ctx->ggml_ctx, x, w, b, 1, kernel_size_ / 2, 1, groups_, true);
+            // Apply GELU out of place before cropping to keep graph buffer reuse safe.
+            x = ggml_gelu_erf(ctx->ggml_ctx, x);
+            x = ggml_view_3d(ctx->ggml_ctx, x, x->ne[0] - 1, x->ne[1], x->ne[2], x->nb[1], x->nb[2], 0);
+            return ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3);
+        }
+    };
+
+    struct Wav2Vec2FeedForward : public UnaryBlock {
+        Wav2Vec2FeedForward(const Wav2Vec2Config& config) {
+            blocks["intermediate_dense"] = std::make_shared<Linear>(config.embed_dim, config.embed_dim * 4);
+            blocks["output_dense"]       = std::make_shared<Linear>(config.embed_dim * 4, config.embed_dim);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) {
+            auto intermediate_dense = std::dynamic_pointer_cast<Linear>(blocks["intermediate_dense"]);
+            auto output_dense       = std::dynamic_pointer_cast<Linear>(blocks["output_dense"]);
+            x                       = intermediate_dense->forward(ctx, x);
+            x                       = ggml_ext_gelu(ctx->ggml_ctx, x, true);
+            x                       = output_dense->forward(ctx, x);
+            return x;
+        }
+    };
+
+    struct Wav2Vec2EncoderLayer : public UnaryBlock {
+        bool do_stable_layer_norm;
+
+        Wav2Vec2EncoderLayer(const Wav2Vec2Config& config)
+            : do_stable_layer_norm(config.do_stable_layer_norm) {
+            blocks["attention"]        = std::make_shared<MultiheadAttention>(config.embed_dim, config.num_heads, true, true);
+            blocks["layer_norm"]       = std::make_shared<LayerNorm>(config.embed_dim);
+            blocks["feed_forward"]     = std::make_shared<Wav2Vec2FeedForward>(config);
+            blocks["final_layer_norm"] = std::make_shared<LayerNorm>(config.embed_dim);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) {
+            auto attention        = std::dynamic_pointer_cast<MultiheadAttention>(blocks["attention"]);
+            auto layer_norm       = std::dynamic_pointer_cast<LayerNorm>(blocks["layer_norm"]);
+            auto feed_forward     = std::dynamic_pointer_cast<Wav2Vec2FeedForward>(blocks["feed_forward"]);
+            auto final_layer_norm = std::dynamic_pointer_cast<LayerNorm>(blocks["final_layer_norm"]);
+
+            ggml_tensor* residual = x;
+            if (do_stable_layer_norm) {
+                x = layer_norm->forward(ctx, x);
+                x = attention->forward(ctx, x);
+                x = ggml_add(ctx->ggml_ctx, residual, x);
+                x = ggml_add(ctx->ggml_ctx, x, feed_forward->forward(ctx, final_layer_norm->forward(ctx, x)));
+            } else {
+                x = attention->forward(ctx, x);
+                x = ggml_add(ctx->ggml_ctx, residual, x);
+                x = layer_norm->forward(ctx, x);
+                x = final_layer_norm->forward(ctx, ggml_add(ctx->ggml_ctx, x, feed_forward->forward(ctx, x)));
+            }
+            return x;
+        }
+    };
+
+    struct Wav2Vec2Encoder : public GGMLBlock {
+        int num_layers;
+        bool do_stable_layer_norm;
+
+        Wav2Vec2Encoder(const Wav2Vec2Config& config)
+            : num_layers(config.num_layers), do_stable_layer_norm(config.do_stable_layer_norm) {
+            blocks["pos_conv_embed"] = std::make_shared<Wav2Vec2PositionalConvEmbedding>(config);
+            for (int i = 0; i < config.num_layers; ++i) {
+                blocks["layers." + std::to_string(i)] = std::make_shared<Wav2Vec2EncoderLayer>(config);
+            }
+            blocks["layer_norm"] = std::make_shared<LayerNorm>(config.embed_dim);
+        }
+
+        // For N == 1, all_layers stacks pre-layer states and the final state as [embed_dim, L, num_layers + 1].
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x, ggml_tensor** all_layers = nullptr) {
+            auto pos_conv_embed = std::dynamic_pointer_cast<Wav2Vec2PositionalConvEmbedding>(blocks["pos_conv_embed"]);
+            auto layer_norm     = std::dynamic_pointer_cast<LayerNorm>(blocks["layer_norm"]);
+
+            std::vector<ggml_tensor*> collected;
+            if (all_layers != nullptr) {
+                collected.reserve(num_layers + 1);
+            }
+
+            x = ggml_add(ctx->ggml_ctx, x, pos_conv_embed->forward(ctx, x));
+            if (!do_stable_layer_norm) {
+                x = layer_norm->forward(ctx, x);
+            }
+            for (int i = 0; i < num_layers; ++i) {
+                if (all_layers != nullptr) {
+                    collected.push_back(x);
+                }
+                auto layer = std::dynamic_pointer_cast<Wav2Vec2EncoderLayer>(blocks["layers." + std::to_string(i)]);
+                x          = layer->forward(ctx, x);
+            }
+            if (do_stable_layer_norm) {
+                x = layer_norm->forward(ctx, x);
+            }
+            if (all_layers != nullptr) {
+                collected.push_back(x);
+                ggml_tensor* stack = collected[0];
+                for (size_t i = 1; i < collected.size(); ++i) {
+                    stack = ggml_concat(ctx->ggml_ctx, stack, collected[i], 2);
+                }
+                *all_layers = stack;
+            }
+            return x;
+        }
+    };
+
+    struct Wav2Vec2Model : public GGMLBlock {
+        Wav2Vec2Config config;
+
+        Wav2Vec2Model() = default;
+        Wav2Vec2Model(const Wav2Vec2Config& config_)
+            : config(config_) {
+            blocks["feature_extractor"]  = std::make_shared<Wav2Vec2FeatureEncoder>(config);
+            blocks["feature_projection"] = std::make_shared<Wav2Vec2FeatureProjection>(config);
+            blocks["encoder"]            = std::make_shared<Wav2Vec2Encoder>(config);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x, ggml_tensor** all_layers = nullptr) {
+            auto feature_extractor  = std::dynamic_pointer_cast<Wav2Vec2FeatureEncoder>(blocks["feature_extractor"]);
+            auto feature_projection = std::dynamic_pointer_cast<Wav2Vec2FeatureProjection>(blocks["feature_projection"]);
+            auto encoder            = std::dynamic_pointer_cast<Wav2Vec2Encoder>(blocks["encoder"]);
+
+            x = feature_extractor->forward(ctx, x);
+            x = feature_projection->forward(ctx, x);
+            x = encoder->forward(ctx, x, all_layers);
+            return x;
+        }
+    };
+
+    class Wav2Vec2ModelRunner : public GGMLRunner {
+    private:
+        Wav2Vec2Config config;
+
+    public:
+        Wav2Vec2Model model;
+        std::string weight_prefix;
+
+        Wav2Vec2ModelRunner(ggml_backend_t backend,
+                            const String2TensorStorage& tensor_storage_map      = {},
+                            const std::string prefix                            = "wav2vec2.",
+                            std::shared_ptr<RunnerWeightManager> weight_manager = nullptr)
+            : GGMLRunner(backend, weight_manager),
+              config(Wav2Vec2Config::detect_from_weights(tensor_storage_map, prefix)),
+              model(config),
+              weight_prefix(prefix) {
+            // GGMLBlock appends its own separator; loader prefixes already include one.
+            std::string block_prefix = weight_prefix;
+            if (!block_prefix.empty() && block_prefix.back() == '.') {
+                block_prefix.pop_back();
+            }
+            model.init(params_ctx, tensor_storage_map, block_prefix);
+            LOG_INFO("%s", get_desc().c_str());
+        }
+
+        std::string get_desc() override {
+            return "wav2vec2";
+        }
+
+        void get_param_tensors(std::map<std::string, ggml_tensor*>& tensors) {
+            std::string block_prefix = weight_prefix;
+            if (!block_prefix.empty() && block_prefix.back() == '.') {
+                block_prefix.pop_back();
+            }
+            model.get_param_tensors(tensors, block_prefix);
+        }
+
+        ggml_cgraph* build_graph(const sd::Tensor<float>& waveform_tensor) {
+            ggml_cgraph* gf         = ggml_new_graph(compute_ctx);
+            ggml_tensor* waveform   = make_input(waveform_tensor);
+            auto runner_ctx         = get_context();
+            ggml_tensor* all_layers = nullptr;
+            model.forward(&runner_ctx, waveform, &all_layers);
+            GGML_ASSERT(all_layers != nullptr);
+            ggml_build_forward_expand(gf, all_layers);
+            return gf;
+        }
+
+        sd::Tensor<float> compute(const int n_threads, const std::vector<float>& mono_waveform) {
+            GGML_ASSERT(!mono_waveform.empty());
+            const int64_t num_samples = (int64_t)mono_waveform.size();
+            sd::Tensor<float> waveform({num_samples, 1, 1});
+            std::copy(mono_waveform.begin(), mono_waveform.end(), waveform.data());
+            normalize(waveform.data(), num_samples);
+
+            auto get_graph = [&]() -> ggml_cgraph* {
+                return build_graph(waveform);
+            };
+            return take_or_empty(GGMLRunner::compute(get_graph, n_threads, true));
+        }
+
+    private:
+        static void normalize(float* x, int64_t n) {
+            double mean = 0.0;
+            for (int64_t i = 0; i < n; ++i) {
+                mean += x[i];
+            }
+            mean /= n;
+            double var = 0.0;
+            for (int64_t i = 0; i < n; ++i) {
+                const double d = x[i] - mean;
+                var += d * d;
+            }
+            var /= n;
+            const float scale = (float)(1.0 / std::sqrt(var + 1e-7));
+            for (int64_t i = 0; i < n; ++i) {
+                x[i] = (float)((x[i] - mean) * scale);
+            }
+        }
+    };
+
+}  // namespace Wav2Vec2
+
+#endif  // __SD_MODEL_AUDIO_WAV2VEC2_HPP__

src/model/common/ggml_block.hpp

@@ -368,6 +368,61 @@ public:
     }
 };
 
+class Conv1d : public UnaryBlock {
+protected:
+    int64_t in_channels;
+    int64_t out_channels;
+    int64_t groups;
+    int kernel_size;
+    int stride;
+    int padding;
+    int dilation;
+    bool bias;
+    bool force_prec_f32;
+
+    void init_params(ggml_context* ctx, const String2TensorStorage& tensor_storage_map = {}, const std::string prefix = "") override {
+        ggml_type wtype  = get_type(prefix + "weight", tensor_storage_map, GGML_TYPE_F16);
+        params["weight"] = ggml_new_tensor_3d(ctx, wtype, kernel_size, in_channels / groups, out_channels);
+        if (bias) {
+            params["bias"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, out_channels);
+        }
+    }
+
+public:
+    Conv1d(int64_t in_channels,
+           int64_t out_channels,
+           int kernel_size,
+           int stride          = 1,
+           int padding         = 0,
+           int dilation        = 1,
+           int64_t groups      = 1,
+           bool bias           = true,
+           bool force_prec_f32 = false)
+        : in_channels(in_channels),
+          out_channels(out_channels),
+          groups(groups),
+          kernel_size(kernel_size),
+          stride(stride),
+          padding(padding),
+          dilation(dilation),
+          bias(bias),
+          force_prec_f32(force_prec_f32) {
+        GGML_ASSERT(in_channels > 0 && out_channels > 0 && groups > 0);
+        GGML_ASSERT(in_channels % groups == 0 && out_channels % groups == 0);
+        GGML_ASSERT(kernel_size > 0 && stride > 0 && padding >= 0 && dilation > 0);
+    }
+
+    std::string get_desc() override {
+        return "Conv1d";
+    }
+
+    ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+        GGML_ASSERT(x->ne[1] == in_channels);
+        return ggml_ext_conv_1d(ctx->ggml_ctx, x, params["weight"], bias ? params["bias"] : nullptr,
+                                stride, padding, dilation, groups, force_prec_f32);
+    }
+};
+
 class Conv2d : public UnaryBlock {
 protected:
     int64_t in_channels;
@@ -766,7 +821,7 @@ public:
                 b = ctx->weight_adapter->patch_weight(ctx->ggml_ctx, ctx->backend, b, prefix + "bias");
             }
         }
-        return ggml_ext_group_norm(ctx->ggml_ctx, x, w, b, num_groups);
+        return ggml_ext_group_norm(ctx->ggml_ctx, x, w, b, num_groups, eps);
     }
 };
 

src/model/common/rope.hpp

@@ -818,8 +818,9 @@ namespace Rope {
                                                     int pw,
                                                     int bs,
                                                     int theta,
-                                                    const std::vector<int>& axes_dim) {
-        std::vector<std::vector<float>> ids = gen_vid_ids(t, h, w, pt, ph, pw, bs);
+                                                    const std::vector<int>& axes_dim,
+                                                    int t_offset = 0) {
+        std::vector<std::vector<float>> ids = gen_vid_ids(t, h, w, pt, ph, pw, bs, t_offset);
         return embed_nd(ids, bs, static_cast<float>(theta), axes_dim);
     }
 

src/model/diffusion/model.hpp

@@ -69,6 +69,8 @@ struct AnimaDiffusionExtra {
 struct WanDiffusionExtra {
     const sd::Tensor<float>* vace_context = nullptr;
     float vace_strength                   = 1.f;
+    // S2V audio, sd::Tensor layout: [dim, T_latent*4, layers].
+    const sd::Tensor<float>* audio_embed = nullptr;
 };
 
 struct HiDreamO1DiffusionExtra {

src/model/diffusion/wan.hpp

@@ -1,6 +1,7 @@
 #ifndef __SD_MODEL_DIFFUSION_WAN_HPP__
 #define __SD_MODEL_DIFFUSION_WAN_HPP__
 
+#include <algorithm>
 #include <cinttypes>
 #include <map>
 #include <memory>
@@ -33,11 +34,16 @@ namespace WAN {
         int vace_layers                        = 0;
         int64_t vace_in_dim                    = 96;
         std::map<int, int> vace_layers_mapping = {};
-        bool qk_norm                           = true;
-        bool cross_attn_norm                   = true;
-        float eps                              = 1e-6f;
-        int64_t flf_pos_embed_token_number     = 0;
-        int theta                              = 10000;
+        int64_t audio_dim                       = 1024;
+        int num_audio_token                     = 4;     // excludes the learned padding token
+        std::vector<int> audio_inject_layers    = {};
+        std::map<int, int> audio_inject_mapping = {};  // block index -> injector index
+        std::string adain_mode                  = "attn_norm";
+        bool qk_norm                            = true;
+        bool cross_attn_norm                    = true;
+        float eps                               = 1e-6f;
+        int64_t flf_pos_embed_token_number      = 0;
+        int theta                               = 10000;
         // wan2.1 1.3B: 1536/12, wan2.1/2.2 14B: 5120/40, wan2.2 5B: 3074/24
         std::vector<int> axes_dim = {44, 42, 42};
         int64_t axes_dim_sum      = 128;
@@ -74,6 +80,10 @@ namespace WAN {
                 if (name.find("img_emb") != std::string::npos) {
                     config.model_type = "i2v";
                 }
+                if (name.find("audio_injector") != std::string::npos || name.find("casual_audio_encoder") != std::string::npos) {
+                    config.model_type          = "s2v";
+                    config.audio_inject_layers = {0, 4, 8, 12, 16, 20, 24, 27, 30, 33, 36, 39};
+                }
                 if (name.find("img_emb.emb_pos") != std::string::npos) {
                     config.flf_pos_embed_token_number = 514;
                 }
@@ -265,6 +275,13 @@ namespace WAN {
         }
     };
 
+}  // namespace WAN
+
+// Audio injection reuses WanT2VCrossAttention defined above.
+#include "model/diffusion/wan_audio.hpp"
+
+namespace WAN {
+
     static ggml_tensor* modulate_add(ggml_context* ctx, ggml_tensor* x, ggml_tensor* e) {
         // x: [N, n_token, dim]
         // e: [N, 1, dim] or [N, T, 1, dim]
@@ -532,6 +549,13 @@ namespace WAN {
     protected:
         WanConfig config;
 
+        void init_params(ggml_context* ctx, const String2TensorStorage& tensor_storage_map = {}, const std::string prefix = "") override {
+            if (config.model_type == "s2v") {
+                enum ggml_type wtype                 = GGML_TYPE_F32;  // elementwise add vs F32 activations
+                params["trainable_cond_mask.weight"] = ggml_new_tensor_2d(ctx, wtype, config.dim, 3);
+            }
+        }
+
     public:
         Wan() {}
         Wan(WanConfig config)
@@ -554,7 +578,7 @@ namespace WAN {
 
             // blocks
             for (int i = 0; i < config.num_layers; i++) {
-                auto block                            = std::shared_ptr<GGMLBlock>(new WanAttentionBlock(config.model_type == "t2v",
+                auto block                            = std::shared_ptr<GGMLBlock>(new WanAttentionBlock(config.model_type != "i2v",
                                                                                                          config.dim,
                                                                                                          config.ffn_dim,
                                                                                                          config.num_heads,
@@ -595,6 +619,14 @@ namespace WAN {
 
                 blocks["vace_patch_embedding"] = std::shared_ptr<GGMLBlock>(new Conv3d(config.vace_in_dim, config.dim, config.patch_size, config.patch_size));
             }
+
+            if (config.model_type == "s2v") {
+                blocks["casual_audio_encoder"] = std::make_shared<WanCausalAudioEncoder>(config.audio_dim, config.dim, config.num_audio_token);
+                blocks["audio_injector"]       = std::make_shared<WanAudioInjector>(config.dim, config.num_heads, (int)config.audio_inject_layers.size(), config.qk_norm, config.eps);
+                for (size_t i = 0; i < config.audio_inject_layers.size(); i++) {
+                    config.audio_inject_mapping[config.audio_inject_layers[i]] = (int)i;
+                }
+            }
         }
 
         ggml_tensor* pad_to_patch_size(GGMLRunnerContext* ctx,
@@ -642,18 +674,24 @@ namespace WAN {
                                   ggml_tensor* timestep,
                                   ggml_tensor* context,
                                   ggml_tensor* pe,
-                                  ggml_tensor* clip_fea     = nullptr,
-                                  ggml_tensor* vace_context = nullptr,
-                                  float vace_strength       = 1.f,
-                                  int64_t N                 = 1) {
+                                  ggml_tensor* clip_fea         = nullptr,
+                                  ggml_tensor* vace_context     = nullptr,
+                                  float vace_strength           = 1.f,
+                                  int64_t N                     = 1,
+                                  ggml_tensor* audio_embed      = nullptr,
+                                  ggml_tensor* reference_latent = nullptr) {
             // x: [N*C, T, H, W], C => in_dim
             // vace_context: [N*vace_in_dim, T, H, W]
             // timestep: [N,] or [T]
             // context: [N, L, text_dim]
-            // return: [N, t_len*h_len*w_len, out_dim*pt*ph*pw]
+            // audio_embed: [layers, T*4, audio_dim]
+            // reference_latent: [N*C, T_ref, H, W]
+            // return: [N, (t_len [+ t_ref_len]) * h_len*w_len, out_dim*pt*ph*pw]
 
             GGML_ASSERT(N == 1);
 
+            int64_t T = x->ne[2];
+
             auto patch_embedding = std::dynamic_pointer_cast<Conv3d>(blocks["patch_embedding"]);
 
             auto text_embedding_0 = std::dynamic_pointer_cast<Linear>(blocks["text_embedding.0"]);
@@ -670,6 +708,40 @@ namespace WAN {
             x = ggml_reshape_3d(ctx->ggml_ctx, x, x->ne[0] * x->ne[1] * x->ne[2], x->ne[3] / N, N);  // [N, dim, t_len*h_len*w_len]
             x = ggml_ext_cont(ctx->ggml_ctx, ggml_ext_torch_permute(ctx->ggml_ctx, x, 1, 0, 2, 3));  // [N, t_len*h_len*w_len, dim]
 
+            ggml_tensor* audio_local  = nullptr;
+            ggml_tensor* audio_global = nullptr;
+            int64_t seq_len           = x->ne[1];
+            int64_t t_ref_len         = 0;
+            if (config.model_type == "s2v") {
+                if (audio_embed != nullptr) {
+                    GGML_ASSERT(audio_embed->ne[1] == T * 4);
+                    auto audio_encoder = std::dynamic_pointer_cast<WanCausalAudioEncoder>(blocks["casual_audio_encoder"]);
+                    auto audio_emb     = audio_encoder->forward(ctx, audio_embed);
+                    audio_local        = audio_emb.first;
+                    audio_global       = audio_emb.second;
+                    GGML_ASSERT(audio_local->ne[2] == T);
+                }
+
+                // video tokens get cond_mask[0], reference tokens cond_mask[1]
+                auto cond_mask = params["trainable_cond_mask.weight"];
+                auto cm0       = ggml_reshape_3d(ctx->ggml_ctx, ggml_ext_slice(ctx->ggml_ctx, cond_mask, 1, 0, 1), config.dim, 1, 1);
+                x              = ggml_add(ctx->ggml_ctx, x, cm0);
+
+                if (reference_latent != nullptr) {
+                    t_ref_len = reference_latent->ne[2];
+                    auto ref  = patch_embedding->forward(ctx, reference_latent);
+                    ref       = ggml_reshape_3d(ctx->ggml_ctx, ref, ref->ne[0] * ref->ne[1] * ref->ne[2], ref->ne[3] / N, N);
+                    ref       = ggml_ext_cont(ctx->ggml_ctx, ggml_ext_torch_permute(ctx->ggml_ctx, ref, 1, 0, 2, 3));  // [N, t_ref*h_len*w_len, dim]
+                    auto cm1  = ggml_reshape_3d(ctx->ggml_ctx, ggml_ext_slice(ctx->ggml_ctx, cond_mask, 1, 1, 2), config.dim, 1, 1);
+                    ref       = ggml_add(ctx->ggml_ctx, ref, cm1);
+                    x         = ggml_concat(ctx->ggml_ctx, x, ref, 1);
+
+                    // Reference tokens use timestep 0.
+                    GGML_ASSERT(timestep->ne[0] == T);
+                    timestep = ggml_ext_pad(ctx->ggml_ctx, timestep, (int)t_ref_len, 0, 0, 0);
+                }
+            }
+
             // time_embedding
             auto e = ggml_ext_timestep_embedding(ctx->ggml_ctx, timestep, config.freq_dim);
             e      = time_embedding_0->forward(ctx, e);
@@ -714,6 +786,11 @@ namespace WAN {
 
             auto x_orig = x;
 
+            std::shared_ptr<WanAudioInjector> audio_injector;
+            if (audio_local != nullptr) {
+                audio_injector = std::dynamic_pointer_cast<WanAudioInjector>(blocks["audio_injector"]);
+            }
+
             for (int i = 0; i < config.num_layers; i++) {
                 auto block = std::dynamic_pointer_cast<WanAttentionBlock>(blocks["blocks." + std::to_string(i)]);
 
@@ -731,6 +808,13 @@ namespace WAN {
                     c_skip      = ggml_ext_scale(ctx->ggml_ctx, c_skip, vace_strength);
                     x           = ggml_add(ctx->ggml_ctx, x, c_skip);
                 }
+
+                if (audio_injector != nullptr) {
+                    auto inject_iter = config.audio_inject_mapping.find(i);
+                    if (inject_iter != config.audio_inject_mapping.end()) {
+                        x = audio_injector->forward(ctx, x, seq_len, T, inject_iter->second, audio_local, audio_global);
+                    }
+                }
                 sd::ggml_graph_cut::mark_graph_cut(x, "wan.blocks." + std::to_string(i), "x");
                 if (c != nullptr) {
                     sd::ggml_graph_cut::mark_graph_cut(c, "wan.blocks." + std::to_string(i), "c");
@@ -747,11 +831,13 @@ namespace WAN {
                              ggml_tensor* timestep,
                              ggml_tensor* context,
                              ggml_tensor* pe,
-                             ggml_tensor* clip_fea        = nullptr,
-                             ggml_tensor* time_dim_concat = nullptr,
-                             ggml_tensor* vace_context    = nullptr,
-                             float vace_strength          = 1.f,
-                             int64_t N                    = 1) {
+                             ggml_tensor* clip_fea         = nullptr,
+                             ggml_tensor* time_dim_concat  = nullptr,
+                             ggml_tensor* vace_context     = nullptr,
+                             float vace_strength           = 1.f,
+                             int64_t N                     = 1,
+                             ggml_tensor* audio_embed      = nullptr,
+                             ggml_tensor* reference_latent = nullptr) {
             // Forward pass of DiT.
             // x: [N*C, T, H, W]
             // timestep: [N,]
@@ -779,7 +865,12 @@ namespace WAN {
                 t_len           = ((x->ne[2] + (std::get<0>(config.patch_size) / 2)) / std::get<0>(config.patch_size));
             }
 
-            auto out = forward_orig(ctx, x, timestep, context, pe, clip_fea, vace_context, vace_strength, N);  // [N, t_len*h_len*w_len, pt*ph*pw*C]
+            auto out = forward_orig(ctx, x, timestep, context, pe, clip_fea, vace_context, vace_strength, N, audio_embed, reference_latent);  // [N, (t_len [+t_ref]) *h_len*w_len, pt*ph*pw*C]
+
+            if (reference_latent != nullptr) {
+                // Exclude reference tokens from the generated video.
+                out = ggml_ext_slice(ctx->ggml_ctx, out, 1, 0, t_len * h_len * w_len);
+            }
 
             out = unpatchify(ctx->ggml_ctx, out, t_len, h_len, w_len);  // [N*C, (T+pad_t) + (T2+pad_t2), H + pad_h, W + pad_w]
 
@@ -839,7 +930,10 @@ namespace WAN {
                     config.text_len  = 512;
                 }
             } else if (config.num_layers == 40) {
-                if (config.model_type == "t2v") {
+                if (version == VERSION_WAN2_2_S2V) {
+                    desc          = "Wan2.2-S2V-14B";
+                    config.in_dim = 16;
+                } else if (config.model_type == "t2v") {
                     if (version == VERSION_WAN2_2_I2V) {
                         desc          = "Wan2.2-I2V-14B";
                         config.in_dim = 36;
@@ -891,7 +985,9 @@ namespace WAN {
                                  const sd::Tensor<float>& c_concat_tensor        = {},
                                  const sd::Tensor<float>& time_dim_concat_tensor = {},
                                  const sd::Tensor<float>& vace_context_tensor    = {},
-                                 float vace_strength                             = 1.f) {
+                                 float vace_strength                             = 1.f,
+                                 const sd::Tensor<float>& audio_embed_tensor     = {},
+                                 const sd::Tensor<float>& ref_latent_tensor      = {}) {
             ggml_cgraph* gf = new_graph_custom(WAN_GRAPH_SIZE);
 
             ggml_tensor* x               = make_input(x_tensor);
@@ -901,16 +997,33 @@ namespace WAN {
             ggml_tensor* c_concat        = make_optional_input(c_concat_tensor);
             ggml_tensor* time_dim_concat = make_optional_input(time_dim_concat_tensor);
             ggml_tensor* vace_context    = make_optional_input(vace_context_tensor);
+            ggml_tensor* audio_embed     = make_optional_input(audio_embed_tensor);
+            ggml_tensor* ref_latent      = make_optional_input(ref_latent_tensor);
 
-            pe_vec      = Rope::gen_wan_pe(static_cast<int>(x->ne[2]),
-                                           static_cast<int>(x->ne[1]),
-                                           static_cast<int>(x->ne[0]),
-                                           std::get<0>(config.patch_size),
-                                           std::get<1>(config.patch_size),
-                                           std::get<2>(config.patch_size),
-                                           1,
-                                           config.theta,
-                                           config.axes_dim);
+            pe_vec = Rope::gen_wan_pe(static_cast<int>(x->ne[2]),
+                                      static_cast<int>(x->ne[1]),
+                                      static_cast<int>(x->ne[0]),
+                                      std::get<0>(config.patch_size),
+                                      std::get<1>(config.patch_size),
+                                      std::get<2>(config.patch_size),
+                                      1,
+                                      config.theta,
+                                      config.axes_dim);
+            if (ref_latent != nullptr) {
+                // Match S2V's reference-frame temporal offset.
+                int t_start = std::max(30, static_cast<int>(x->ne[2]) + 9);
+                auto ref_pe = Rope::gen_wan_pe(static_cast<int>(ref_latent->ne[2]),
+                                               static_cast<int>(ref_latent->ne[1]),
+                                               static_cast<int>(ref_latent->ne[0]),
+                                               std::get<0>(config.patch_size),
+                                               std::get<1>(config.patch_size),
+                                               std::get<2>(config.patch_size),
+                                               1,
+                                               config.theta,
+                                               config.axes_dim,
+                                               t_start);
+                pe_vec.insert(pe_vec.end(), ref_pe.begin(), ref_pe.end());
+            }
             int pos_len = static_cast<int>(pe_vec.size() / config.axes_dim_sum / 2);
             // LOG_VERBOSE("pos_len %d", pos_len);
             auto pe = ggml_new_tensor_4d(compute_ctx, GGML_TYPE_F32, 2, 2, config.axes_dim_sum / 2, pos_len);
@@ -933,7 +1046,10 @@ namespace WAN {
                                            clip_fea,
                                            time_dim_concat,
                                            vace_context,
-                                           vace_strength);
+                                           vace_strength,
+                                           1,
+                                           audio_embed,
+                                           ref_latent);
 
             ggml_build_forward_expand(gf, out);
 
@@ -948,9 +1064,11 @@ namespace WAN {
                                   const sd::Tensor<float>& c_concat        = {},
                                   const sd::Tensor<float>& time_dim_concat = {},
                                   const sd::Tensor<float>& vace_context    = {},
-                                  float vace_strength                      = 1.f) {
+                                  float vace_strength                      = 1.f,
+                                  const sd::Tensor<float>& audio_embed     = {},
+                                  const sd::Tensor<float>& ref_latent      = {}) {
             auto get_graph = [&]() -> ggml_cgraph* {
-                return build_graph(x, timesteps, context, clip_fea, c_concat, time_dim_concat, vace_context, vace_strength);
+                return build_graph(x, timesteps, context, clip_fea, c_concat, time_dim_concat, vace_context, vace_strength, audio_embed, ref_latent);
             };
 
             return restore_trailing_singleton_dims(GGMLRunner::compute(get_graph, n_threads, false), x.dim());
@@ -961,6 +1079,12 @@ namespace WAN {
             GGML_ASSERT(diffusion_params.x != nullptr);
             GGML_ASSERT(diffusion_params.timesteps != nullptr);
             const auto* extra = diffusion_extra_as<WanDiffusionExtra>(diffusion_params);
+            static const std::vector<sd::Tensor<float>> no_ref_latents;
+            const auto& ref_latents = config.model_type == "s2v" && diffusion_params.ref_latents != nullptr
+                                          ? *diffusion_params.ref_latents
+                                          : no_ref_latents;
+            const sd::Tensor<float> empty_tensor;
+            const sd::Tensor<float>& ref_latent = ref_latents.empty() ? empty_tensor : ref_latents[0];
             return compute(n_threads,
                            *diffusion_params.x,
                            *diffusion_params.timesteps,
@@ -969,7 +1093,9 @@ namespace WAN {
                            tensor_or_empty(diffusion_params.c_concat),
                            sd::Tensor<float>(),
                            tensor_or_empty(extra->vace_context),
-                           extra->vace_strength);
+                           extra->vace_strength,
+                           tensor_or_empty(extra->audio_embed),
+                           ref_latent);
         }
 
         void test() {

src/model/diffusion/wan_audio.hpp

@@ -0,0 +1,215 @@
+#ifndef __SD_MODEL_DIFFUSION_WAN_AUDIO_HPP__
+#define __SD_MODEL_DIFFUSION_WAN_AUDIO_HPP__
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "model/common/ggml_block.hpp"
+
+namespace WAN {
+
+    class WanCausalConv1d : public UnaryBlock {
+    private:
+        int kernel_size_;
+
+    public:
+        WanCausalConv1d(int64_t in_dim,
+                        int64_t out_dim,
+                        int kernel_size = 3,
+                        int stride      = 1)
+            : kernel_size_(kernel_size) {
+            blocks["conv"] = std::make_shared<Conv1d>(in_dim, out_dim, kernel_size, stride, 0, 1, 1, true, true);
+        }
+
+        ggml_tensor* forward(GGMLRunnerContext* ctx, ggml_tensor* x) override {
+            // Replicate the first sample for causal left padding.
+            if (kernel_size_ > 1) {
+                auto first = ggml_ext_slice(ctx->ggml_ctx, x, 0, 0, 1);
+                for (int i = 0; i < kernel_size_ - 1; i++) {
+                    x = ggml_concat(ctx->ggml_ctx, first, x, 0);
+                }
+            }
+            return std::dynamic_pointer_cast<Conv1d>(blocks["conv"])->forward(ctx, x);
+        }
+    };
+
+    class WanMotionEncoder : public GGMLBlock {
+    private:
+        int64_t hidden_dim_;
+        int num_token_;
+        bool need_global_;
+
+        void init_params(ggml_context* ctx, const String2TensorStorage& tensor_storage_map = {}, const std::string prefix = "") override {
+            // The padding token is combined with F32 activations.
+            params["padding_tokens"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, hidden_dim_);
+        }
+
+        ggml_tensor* conv_norm_silu(GGMLRunnerContext* ctx,
+                                    ggml_tensor* x,
+                                    const std::string& conv_key,
+                                    const std::string& norm_key,
+                                    bool to_conv_layout) {
+            x = std::dynamic_pointer_cast<WanCausalConv1d>(blocks[conv_key])->forward(ctx, x);
+            x = ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3);
+            x = std::dynamic_pointer_cast<LayerNorm>(blocks[norm_key])->forward(ctx, x);
+            x = ggml_silu(ctx->ggml_ctx, x);
+            if (to_conv_layout) {
+                x = ggml_ext_cont(ctx->ggml_ctx, ggml_permute(ctx->ggml_ctx, x, 1, 0, 2, 3));
+            }
+            return x;
+        }
+
+    public:
+        WanMotionEncoder(int64_t in_dim,
+                         int64_t hidden_dim,
+                         int num_token,
+                         bool need_global = true)
+            : hidden_dim_(hidden_dim), num_token_(num_token), need_global_(need_global) {
+            blocks["conv1_local"] = std::make_shared<WanCausalConv1d>(in_dim, hidden_dim / 4 * num_token);
+            if (need_global) {
+                blocks["conv1_global"] = std::make_shared<WanCausalConv1d>(in_dim, hidden_dim / 4);
+            }
+            blocks["norm1"] = std::make_shared<LayerNorm>(hidden_dim / 4, 1e-6f, false);
+            blocks["conv2"] = std::make_shared<WanCausalConv1d>(hidden_dim / 4, hidden_dim / 2, 3, 2);
+            blocks["norm2"] = std::make_shared<LayerNorm>(hidden_dim / 2, 1e-6f, false);
+            blocks["conv3"] = std::make_shared<WanCausalConv1d>(hidden_dim / 2, hidden_dim, 3, 2);
+            blocks["norm3"] = std::make_shared<LayerNorm>(hidden_dim, 1e-6f, false);
+            if (need_global) {
+                blocks["final_linear"] = std::make_shared<Linear>(hidden_dim, hidden_dim);
+            }
+        }
+
+        std::pair<ggml_tensor*, ggml_tensor*> forward(GGMLRunnerContext* ctx, ggml_tensor* x) {
+            auto local = std::dynamic_pointer_cast<WanCausalConv1d>(blocks["conv1_local"])->forward(ctx, x);
+            auto norm1 = std::dynamic_pointer_cast<LayerNorm>(blocks["norm1"]);
+            std::vector<ggml_tensor*> tokens;
+            // Each token group is normalized independently over channels.
+            for (auto& group : ggml_ext_chunk(ctx->ggml_ctx, local, num_token_, 1)) {
+                ggml_tensor* s = ggml_permute(ctx->ggml_ctx, group, 1, 0, 2, 3);
+                s              = norm1->forward(ctx, s);
+                s              = ggml_silu(ctx->ggml_ctx, s);
+                s              = ggml_ext_cont(ctx->ggml_ctx, ggml_permute(ctx->ggml_ctx, s, 1, 0, 2, 3));
+                s              = conv_norm_silu(ctx, s, "conv2", "norm2", true);
+                s              = conv_norm_silu(ctx, s, "conv3", "norm3", false);
+                tokens.push_back(ggml_reshape_3d(ctx->ggml_ctx, s, s->ne[0], 1, s->ne[1]));
+            }
+            auto padding = ggml_reshape_3d(ctx->ggml_ctx, params["padding_tokens"], hidden_dim_, 1, 1);
+            padding      = ggml_repeat(ctx->ggml_ctx, padding, tokens[0]);
+            tokens.push_back(padding);
+            ggml_tensor* local_out = ggml_ext_vec_concat(ctx->ggml_ctx, tokens, 1);
+
+            if (!need_global_) {
+                return {local_out, nullptr};
+            }
+            ggml_tensor* g = conv_norm_silu(ctx, x, "conv1_global", "norm1", true);
+            g              = conv_norm_silu(ctx, g, "conv2", "norm2", true);
+            g              = conv_norm_silu(ctx, g, "conv3", "norm3", false);
+            g              = std::dynamic_pointer_cast<Linear>(blocks["final_linear"])->forward(ctx, g);
+            return {local_out, g};
+        }
+    };
+
+    class WanCausalAudioEncoder : public GGMLBlock {
+    private:
+        int num_layers_;
+
+        void init_params(ggml_context* ctx, const String2TensorStorage& tensor_storage_map = {}, const std::string prefix = "") override {
+            // Preserve the checkpoint shape for loading; layer mixing requires F32.
+            auto it = tensor_storage_map.find(prefix + "weights");
+            if (it != tensor_storage_map.end()) {
+                params["weights"] = ggml_new_tensor(ctx, GGML_TYPE_F32, it->second.n_dims, it->second.ne);
+            } else {
+                params["weights"] = ggml_new_tensor_1d(ctx, GGML_TYPE_F32, num_layers_);
+            }
+        }
+
+    public:
+        WanCausalAudioEncoder(int64_t audio_dim,
+                              int64_t dim,
+                              int num_token,
+                              int num_layers = 25)
+            : num_layers_(num_layers) {
+            blocks["encoder"] = std::make_shared<WanMotionEncoder>(audio_dim, dim, num_token, true);
+        }
+
+        // features: [layers, frames, audio_dim]; outputs: [T, tokens+1, dim] and [T, dim].
+        std::pair<ggml_tensor*, ggml_tensor*> forward(GGMLRunnerContext* ctx, ggml_tensor* features) {
+            auto weights = ggml_silu(ctx->ggml_ctx, params["weights"]);
+            auto x       = ggml_mul(ctx->ggml_ctx, features, ggml_reshape_3d(ctx->ggml_ctx, weights, 1, 1, num_layers_));
+            x            = ggml_div(ctx->ggml_ctx, x, ggml_sum(ctx->ggml_ctx, weights));
+            // Move the layer axis to ggml dimension 0 for reduction.
+            x = ggml_ext_cont(ctx->ggml_ctx, ggml_ext_torch_permute(ctx->ggml_ctx, x, 2, 0, 1, 3));
+            x = ggml_sum_rows(ctx->ggml_ctx, x);
+            x = ggml_reshape_2d(ctx->ggml_ctx, x, x->ne[1], x->ne[2]);
+            x = ggml_ext_cont(ctx->ggml_ctx, ggml_ext_torch_permute(ctx->ggml_ctx, x, 1, 0, 2, 3));
+            return std::dynamic_pointer_cast<WanMotionEncoder>(blocks["encoder"])->forward(ctx, x);
+        }
+    };
+
+    class WanAudioInjector : public GGMLBlock {
+    private:
+        int64_t dim_;
+
+    public:
+        WanAudioInjector(int64_t dim,
+                         int64_t num_heads,
+                         int count,
+                         bool qk_norm = true,
+                         float eps    = 1e-6f)
+            : dim_(dim) {
+            for (int i = 0; i < count; i++) {
+                blocks["injector." + std::to_string(i)] =
+                    std::make_shared<WanT2VCrossAttention>(dim, num_heads, qk_norm, eps);
+                blocks["injector_adain_layers." + std::to_string(i) + ".linear"] =
+                    std::make_shared<Linear>(dim, dim * 2);
+            }
+            // S2V AdaLayerNorm uses its own epsilon, independent of attention norms.
+            blocks["adain_norm"] = std::make_shared<LayerNorm>(dim, 1e-5f, false);
+        }
+
+        // Inject into the video prefix; trailing reference tokens pass through unchanged.
+        ggml_tensor* forward(GGMLRunnerContext* ctx,
+                             ggml_tensor* x,
+                             int64_t seq_len,
+                             int64_t T,
+                             int injector_id,
+                             ggml_tensor* audio_local,
+                             ggml_tensor* audio_global) {
+            int64_t n_tok   = seq_len / T;
+            int64_t n_token = x->ne[1];
+
+            auto adain_linear = std::dynamic_pointer_cast<Linear>(blocks["injector_adain_layers." + std::to_string(injector_id) + ".linear"]);
+            auto injector     = std::dynamic_pointer_cast<WanT2VCrossAttention>(blocks["injector." + std::to_string(injector_id)]);
+            auto adain_norm   = std::dynamic_pointer_cast<LayerNorm>(blocks["adain_norm"]);
+
+            auto temb  = ggml_silu(ctx->ggml_ctx, audio_global);
+            temb       = adain_linear->forward(ctx, temb);
+            auto shift = ggml_ext_slice(ctx->ggml_ctx, temb, 0, 0, dim_);
+            auto scale = ggml_ext_slice(ctx->ggml_ctx, temb, 0, dim_, dim_ * 2);
+            shift      = ggml_reshape_3d(ctx->ggml_ctx, shift, dim_, 1, T);
+            scale      = ggml_reshape_3d(ctx->ggml_ctx, scale, dim_, 1, T);
+
+            auto x_vid = ggml_ext_slice(ctx->ggml_ctx, x, 1, 0, seq_len);
+            auto h     = ggml_reshape_3d(ctx->ggml_ctx, x_vid, dim_, n_tok, T);
+            h          = adain_norm->forward(ctx, h);
+            h          = ggml_add(ctx->ggml_ctx, h, ggml_mul(ctx->ggml_ctx, h, scale));
+            h          = ggml_add(ctx->ggml_ctx, h, shift);
+
+            auto res = injector->forward(ctx, h, audio_local, 0);
+            res      = ggml_reshape_2d(ctx->ggml_ctx, res, dim_, seq_len);
+
+            auto x_head = ggml_add(ctx->ggml_ctx, x_vid, res);
+            if (seq_len < n_token) {
+                auto x_tail = ggml_ext_slice(ctx->ggml_ctx, x, 1, seq_len, n_token);
+                return ggml_concat(ctx->ggml_ctx, x_head, x_tail, 1);
+            }
+            return x_head;
+        }
+    };
+
+}  // namespace WAN
+
+#endif  // __SD_MODEL_DIFFUSION_WAN_AUDIO_HPP__

src/model_component.h

@@ -10,6 +10,7 @@ enum class ModelComponent {
     VAE,
     PreviewVAE,
     AudioVAE,
+    AudioEncoder,
     ControlNet,
     PhotoMaker,
     PuLID,
@@ -38,6 +39,8 @@ inline const char* model_component_name(ModelComponent component) {
             return "preview VAE";
         case ModelComponent::AudioVAE:
             return "audio VAE";
+        case ModelComponent::AudioEncoder:
+            return "audio encoder";
         case ModelComponent::ControlNet:
             return "ControlNet";
         case ModelComponent::PhotoMaker:

src/model_io/safetensors_io.cpp

@@ -247,6 +247,11 @@ bool read_safetensors_file(const std::string& file_path,
         std::string dtype    = tensor_info["dtype"];
         nlohmann::json shape = tensor_info["shape"];
 
+        // ComfyUI FP8 activation scales cancel when inference uses F16/F32 activations.
+        if (ends_with(name, ".scale_input")) {
+            continue;
+        }
+
         size_t begin = tensor_info["data_offsets"][0].get<size_t>();
         size_t end   = tensor_info["data_offsets"][1].get<size_t>();
         if (begin > end || end > file_size_ - data_start) {

src/model_loader.cpp

@@ -435,6 +435,7 @@ SDVersion ModelLoader::get_sd_version() const {
     bool is_flux2                    = false;
     bool has_single_block_47         = false;
     bool is_wan                      = false;
+    bool is_s2v                      = false;
     int64_t patch_embedding_channels = 0;
     bool has_img_emb                 = false;
     bool has_middle_block_1          = false;
@@ -524,6 +525,11 @@ SDVersion ModelLoader::get_sd_version() const {
         if (tensor_storage.name.find("model.diffusion_model.blocks.0.cross_attn.norm_k.weight") != std::string::npos) {
             is_wan = true;
         }
+        if (tensor_storage.name.find("casual_audio_encoder.weights") != std::string::npos ||
+            tensor_storage.name.find("audio_injector.injector.0.q.weight") != std::string::npos) {
+            // S2V and T2V-14B share patch_embedding shapes.
+            is_s2v = true;
+        }
         if (tensor_storage.name.find("model.diffusion_model.patch_embedder.weight") != std::string::npos) {
             return VERSION_LINGBOT_VIDEO;
         }
@@ -587,6 +593,9 @@ SDVersion ModelLoader::get_sd_version() const {
     }
     if (is_wan) {
         LOG_VERBOSE("patch_embedding_channels %d", patch_embedding_channels);
+        if (is_s2v) {
+            return VERSION_WAN2_2_S2V;
+        }
         if (patch_embedding_channels == 184320 && !has_img_emb) {
             return VERSION_WAN2_2_I2V;
         }

src/pipeline/diffusion_engine.cpp

@@ -33,12 +33,14 @@
 #include "extensions/generation_extension.h"
 #include "model/adapter/ip_adapter.hpp"
 #include "model/adapter/lora.hpp"
+#include "model/audio/wav2vec2.hpp"
 #include "model/diffusion/animatediff.hpp"
 #include "model/diffusion/control.hpp"
 #include "model/diffusion/model.hpp"
 #include "model/vae/audio_vae.hpp"
 #include "model/vae/ltx_vae.hpp"
 #include "model/vae/vae.hpp"
+#include "runtime/audio_processing.h"
 #include "runtime/denoiser.hpp"
 #include "runtime/guidance.h"
 #include "runtime/preview_interval.h"
@@ -74,6 +76,7 @@ const char* model_version_to_str[] = {
     "Wan 2.x",
     "Wan 2.2 I2V",
     "Wan 2.2 TI2V",
+    "Wan 2.2 S2V",
     "LingBot Video",
     "Qwen Image",
     "Qwen Image Layered",
@@ -136,7 +139,7 @@ StableDiffusionGGML::~StableDiffusionGGML() = default;
 
 const std::map<StableDiffusionGGML::RunnerGroup, std::set<ModelComponent>>& StableDiffusionGGML::runner_components() {
     static const std::map<RunnerGroup, std::set<ModelComponent>> components{
-        {RunnerGroup::Core, {ModelComponent::Conditioner, ModelComponent::Diffusion, ModelComponent::HighNoiseDiffusion, ModelComponent::CLIPVision, ModelComponent::IPAdapter}},
+        {RunnerGroup::Core, {ModelComponent::Conditioner, ModelComponent::Diffusion, ModelComponent::HighNoiseDiffusion, ModelComponent::CLIPVision, ModelComponent::IPAdapter, ModelComponent::AudioEncoder}},
         {RunnerGroup::VAE, {ModelComponent::VAE, ModelComponent::PreviewVAE, ModelComponent::AudioVAE}},
         {RunnerGroup::ControlNet, {ModelComponent::ControlNet}},
         {RunnerGroup::Extensions, {ModelComponent::PhotoMaker, ModelComponent::PuLID}},
@@ -804,6 +807,13 @@ bool StableDiffusionGGML::init_model_loader(ModelLoader& model_loader, ModelConf
         }
     }
 
+    if (strlen(SAFE_STR(sd_ctx_params->audio_encoder_path)) > 0) {
+        LOG_INFO("loading audio encoder (wav2vec2) from '%s'", sd_ctx_params->audio_encoder_path);
+        if (!model_loader.init_from_file(sd_ctx_params->audio_encoder_path, "wav2vec2.")) {
+            LOG_WARN("loading audio encoder weights from '%s' failed", sd_ctx_params->audio_encoder_path);
+        }
+    }
+
     if (strlen(SAFE_STR(sd_ctx_params->motion_module_path)) > 0) {
         LOG_INFO("loading motion module (AnimateDiff) from '%s'", sd_ctx_params->motion_module_path);
         if (!model_loader.init_from_file(sd_ctx_params->motion_module_path,
@@ -1010,6 +1020,7 @@ bool StableDiffusionGGML::build_core_runners() {
     high_noise_diffusion_model = std::move(runners.high_noise_diffusion);
     clip_vision                = std::move(runners.clip_vision);
     ip_adapter                 = std::move(runners.ip_adapter);
+    audio_encoder              = std::move(runners.audio_encoder);
 
     cond_stage_model->set_max_graph_vram_bytes(max_graph_vram_bytes_for_module(SDBackendModule::TE));
     diffusion_model->set_max_graph_vram_bytes(max_graph_vram_bytes_for_module(SDBackendModule::DIFFUSION));
@@ -1019,11 +1030,15 @@ bool StableDiffusionGGML::build_core_runners() {
     if (clip_vision) {
         clip_vision->set_max_graph_vram_bytes(max_graph_vram_bytes_for_module(SDBackendModule::CLIP_VISION));
     }
+    if (audio_encoder) {
+        audio_encoder->set_max_graph_vram_bytes(max_graph_vram_bytes_for_module(SDBackendModule::AUDIO_ENCODER));
+    }
     return register_runner_params(ModelComponent::Conditioner, cond_stage_model, SDBackendModule::TE) &&
            register_runner_params(ModelComponent::Diffusion, diffusion_model, SDBackendModule::DIFFUSION) &&
            register_runner_params(ModelComponent::HighNoiseDiffusion, high_noise_diffusion_model, SDBackendModule::DIFFUSION) &&
            register_runner_params(ModelComponent::CLIPVision, clip_vision, SDBackendModule::CLIP_VISION) &&
-           register_runner_params(ModelComponent::IPAdapter, ip_adapter, SDBackendModule::DIFFUSION);
+           register_runner_params(ModelComponent::IPAdapter, ip_adapter, SDBackendModule::DIFFUSION) &&
+           register_runner_params(ModelComponent::AudioEncoder, audio_encoder, SDBackendModule::AUDIO_ENCODER);
 }
 
 bool StableDiffusionGGML::build_vae_runners() {
@@ -1121,6 +1136,12 @@ bool StableDiffusionGGML::validate_and_load_runners() {
     ignore_tensors.insert("model.diffusion_model.__32x32__");
     ignore_tensors.insert("model.diffusion_model.__index_timestep_zero__");
 
+    if (audio_encoder != nullptr) {
+        // These wav2vec2 tensors are unused during feature extraction.
+        ignore_tensors.insert("wav2vec2.lm_head.");
+        ignore_tensors.insert("wav2vec2.masked_spec_embed");
+    }
+
     if (audio_vae_model) {
         if (!sd_version_is_minimax_h3(version)) {
             ignore_tensors.insert("audio_vae.encoder");
@@ -1755,6 +1776,29 @@ sd::Tensor<float> StableDiffusionGGML::get_clip_vision_output(const sd::Tensor<f
     return output;
 }
 
+// Returns 50 Hz wav2vec2 states in sd::Tensor layout: [dim, frames, layers].
+sd::Tensor<float> StableDiffusionGGML::get_audio_embedding(const sd_audio_t& audio) {
+    if (audio_encoder == nullptr) {
+        LOG_ERROR("audio encoder model is not loaded");
+        return {};
+    }
+    if (audio.data == nullptr || audio.sample_count == 0 || audio.channels == 0 || audio.sample_rate == 0) {
+        LOG_ERROR("invalid driving audio");
+        return {};
+    }
+    auto mono = sd::audio::downmix_to_mono(audio.data, audio.sample_count, audio.channels);
+    if (mono.empty()) {
+        LOG_ERROR("audio mono downmix failed");
+        return {};
+    }
+    mono = sd::audio::resample_audio(mono.data(), mono.size(), audio.sample_rate, 16000);
+    if (mono.empty()) {
+        LOG_ERROR("audio resample to 16 kHz failed");
+        return {};
+    }
+    return audio_encoder->compute(n_threads, mono);
+}
+
 void StableDiffusionGGML::compute_ip_adapter_tokens(const sd_image_t& image, float strength) {
     ip_adapter_tokens        = {};
     ip_adapter_uncond_tokens = {};
@@ -1810,6 +1854,10 @@ std::vector<float> StableDiffusionGGML::process_timesteps(const std::vector<floa
             }
         }
         return new_timesteps;
+    }
+    if (diffusion_model->get_desc() == "Wan2.2-S2V-14B") {
+        int64_t frame_count = init_latent.shape()[2];
+        return std::vector<float>(static_cast<size_t>(frame_count), timesteps[0]);
     } else {
         return timesteps;
     }
@@ -2318,7 +2366,8 @@ sd::Tensor<float> StableDiffusionGGML::sample(const std::shared_ptr<DiffusionMod
                                                              condition.c_t5_weights.empty() ? nullptr : &condition.c_t5_weights};
             } else if (sd_version_is_wan(version)) {
                 diffusion_params.extra = WanDiffusionExtra{vace_context.empty() ? nullptr : &vace_context,
-                                                           vace_strength};
+                                                           vace_strength,
+                                                           condition.c_ref_audios.empty() ? nullptr : &condition.c_ref_audios[0]};
             } else if (sd_version_is_hunyuan_video(version)) {
                 diffusion_params.extra = HunyuanVideoDiffusionExtra{
                     &guidance_tensor,

src/pipeline/diffusion_engine.h

@@ -27,6 +27,9 @@ struct LoraModel;
 struct ConditionerParams;
 struct SDCondition;
 struct RefImageParams;
+namespace Wav2Vec2 {
+    class Wav2Vec2ModelRunner;
+}
 
 extern const char* model_version_to_str[];
 
@@ -63,6 +66,7 @@ public:
     std::shared_ptr<VAE> first_stage_model;
     std::shared_ptr<VAE> preview_vae;
     std::shared_ptr<AudioVAERunner> audio_vae_model;
+    std::shared_ptr<Wav2Vec2::Wav2Vec2ModelRunner> audio_encoder;
     std::shared_ptr<ControlNet> control_net;
     std::shared_ptr<IPAdapter::IPAdapterRunner> ip_adapter;
     sd::Tensor<float> ip_adapter_tokens;
@@ -363,6 +367,8 @@ public:
                                              int clip_skip        = -1,
                                              bool zero_out_masked = false);
 
+    sd::Tensor<float> get_audio_embedding(const sd_audio_t& audio);
+
     void compute_ip_adapter_tokens(const sd_image_t& image, float strength);
 
     std::vector<float> process_timesteps(const std::vector<float>& timesteps,

src/pipeline/generation.h

@@ -28,6 +28,7 @@ namespace sd::pipeline {
         sd::Tensor<float> denoise_mask;
         sd::Tensor<float> clip_vision_output;
         sd::Tensor<float> vace_context;
+        sd::Tensor<float> s2v_audio_embed;
         int64_t ref_image_num                  = 0;
         int64_t video_conditioning_frame_count = 0;
         int64_t video_target_frame_count       = 0;
@@ -59,7 +60,8 @@ namespace sd::pipeline {
                         const sd_vid_gen_params_t* sd_vid_gen_params,
                         sd_image_t** frames_out,
                         int* num_frames_out,
-                        sd_audio_t** audio_out);
+                        sd_audio_t** audio_out,
+                        int* fps_out);
 
     sd::Tensor<float> upscale_ltx_spatial_video_latent(StableDiffusionGGML* sd,
                                                        const char* model_path,

src/pipeline/model_builders.cpp

@@ -8,6 +8,7 @@
 #include "core/util.h"
 #include "extensions/generation_extension.h"
 #include "model/adapter/ip_adapter.hpp"
+#include "model/audio/wav2vec2.hpp"
 #include "model/diffusion/anima.hpp"
 #include "model/diffusion/boogu.hpp"
 #include "model/diffusion/control.hpp"
@@ -234,6 +235,16 @@ namespace sd::model_builders {
                                                                                 tensor_storage_map,
                                                                                 weight_manager);
             }
+            if (version == VERSION_WAN2_2_S2V &&
+                tensor_storage_map.count("wav2vec2.encoder.layer_norm.bias") > 0) {
+                if (!ensure_backend_pair(ctx.backends, SDBackendModule::AUDIO_ENCODER)) {
+                    return false;
+                }
+                result.audio_encoder = std::make_shared<Wav2Vec2::Wav2Vec2ModelRunner>(ctx.backends.runtime_backend(SDBackendModule::AUDIO_ENCODER),
+                                                                                       tensor_storage_map,
+                                                                                       "wav2vec2.",
+                                                                                       weight_manager);
+            }
         } else if (sd_version_is_lingbot_video(version)) {
             bool enable_vision = false;
             for (const auto& [name, _] : tensor_storage_map) {

src/pipeline/model_builders.h

@@ -15,6 +15,9 @@ struct DiffusionModelRunner;
 struct VAE;
 struct AudioVAERunner;
 struct ControlNet;
+namespace Wav2Vec2 {
+    class Wav2Vec2ModelRunner;
+}
 struct GenerationExtension;
 struct GenerationExtensionInitContext;
 namespace IPAdapter {
@@ -37,6 +40,7 @@ namespace sd::model_builders {
         std::shared_ptr<DiffusionModelRunner> high_noise_diffusion;
         std::shared_ptr<FrozenCLIPVisionEmbedder> clip_vision;
         std::shared_ptr<IPAdapter::IPAdapterRunner> ip_adapter;
+        std::shared_ptr<Wav2Vec2::Wav2Vec2ModelRunner> audio_encoder;
     };
 
     struct VAEOptions {

src/pipeline/request.cpp

@@ -161,7 +161,10 @@ namespace sd::pipeline {
         frames           = sd->align_video_frames(requested_frames);
         clip_skip        = sd_vid_gen_params->clip_skip;
         fps              = std::max(1, sd_vid_gen_params->fps);
-        if (sd_version_is_minimax_h3(sd->version) && fps != 24) {
+        if (sd->version == VERSION_WAN2_2_S2V && sd_vid_gen_params->fps != 16) {
+            LOG_WARN("Wan2.2 S2V uses 16 fps; overriding requested fps %d", sd_vid_gen_params->fps);
+            fps = 16;
+        } else if (sd_version_is_minimax_h3(sd->version) && fps != 24) {
             LOG_WARN("MiniMax-H3 uses 24 fps; overriding requested fps %d", fps);
             fps = 24;
         }

src/pipeline/video.cpp

@@ -5,6 +5,7 @@
 #include <cstdlib>
 #include <optional>
 
+#include "conditioning/wan_audio.h"
 #include "core/rng.hpp"
 #include "core/rng_philox.hpp"
 #include "diffusion_engine.h"
@@ -420,6 +421,45 @@ namespace sd::pipeline {
         return audio;
     }
 
+    // Build the first 16 fps audio window, zero-padding past the track end.
+    static sd::Tensor<float> build_s2v_audio_window(const sd::Tensor<float>& stacked, int64_t batch_frames) {
+        const int64_t embed_dim  = stacked.shape()[0];
+        const int64_t in_frames  = stacked.shape()[1];
+        const int64_t num_layers = stacked.shape()[2];
+        if (embed_dim <= 0 || in_frames <= 0 || num_layers <= 0 || batch_frames <= 0) {
+            return {};
+        }
+        std::vector<float> layer_first(static_cast<size_t>(num_layers) * in_frames * embed_dim);
+        for (int64_t l = 0; l < num_layers; ++l) {
+            for (int64_t f = 0; f < in_frames; ++f) {
+                const float* src = stacked.data() + l * embed_dim * in_frames + f * embed_dim;
+                std::copy_n(src,
+                            static_cast<size_t>(embed_dim),
+                            layer_first.data() + (static_cast<size_t>(l) * in_frames + f) * embed_dim);
+            }
+        }
+        sd::wan_audio::BucketPlan plan;
+        std::vector<float> buckets = sd::wan_audio::build_audio_buckets(layer_first.data(),
+                                                                        static_cast<int>(num_layers),
+                                                                        static_cast<int>(in_frames),
+                                                                        static_cast<int>(embed_dim),
+                                                                        static_cast<int>(batch_frames),
+                                                                        &plan);
+        if (buckets.empty() || plan.bucket_frames < batch_frames) {
+            return {};
+        }
+        // Reorder frame-major buckets into sd::Tensor's [dim, frame, layer] layout.
+        sd::Tensor<float> window({embed_dim, batch_frames, num_layers});
+        for (int64_t f = 0; f < batch_frames; ++f) {
+            for (int64_t l = 0; l < num_layers; ++l) {
+                const float* src = buckets.data() + (static_cast<size_t>(f) * num_layers + l) * embed_dim;
+                float* dst       = window.data() + l * embed_dim * batch_frames + f * embed_dim;
+                std::copy_n(src, static_cast<size_t>(embed_dim), dst);
+            }
+        }
+        return window;
+    }
+
     static std::optional<ImageGenerationLatents> prepare_video_generation_latents(StableDiffusionGGML* sd,
                                                                                   const sd_vid_gen_params_t* sd_vid_gen_params,
                                                                                   GenerationRequest* request) {
@@ -1033,6 +1073,53 @@ namespace sd::pipeline {
             latents.vace_context = sd::ops::concat(vace_context, mask_context, 3);  // [b, 2*c + vae_scale_factor*vae_scale_factor, t + 1 or t, h/vae_scale_factor, w/vae_scale_factor]
             int64_t t2           = ggml_time_ms();
             LOG_INFO("encode_first_stage completed, taking %" PRId64 " ms", t2 - t1);
+        } else if (sd->diffusion_model->get_desc() == "Wan2.2-S2V-14B") {
+            LOG_INFO("S2V");
+            if (!end_image.empty()) {
+                LOG_WARN("Wan2.2 S2V ignores end_image");
+            }
+            if (sd_vid_gen_params->ref_audios_count > 1) {
+                LOG_ERROR("Wan2.2 S2V supports a single driving audio track");
+                return std::nullopt;
+            }
+            int64_t t1 = ggml_time_ms();
+            if (!start_image.empty()) {
+                auto ref_img     = start_image.reshape({start_image.shape()[0],
+                                                        start_image.shape()[1],
+                                                        1,
+                                                        start_image.shape()[2],
+                                                        1});
+                auto encoded_ref = sd->encode_first_stage(ref_img);
+                if (encoded_ref.empty()) {
+                    LOG_ERROR("failed to encode S2V reference image");
+                    return std::nullopt;
+                }
+                // Wan consumes reference latents in 4D.
+                latents.ref_latents.push_back(encoded_ref.reshape({encoded_ref.shape()[0],
+                                                                   encoded_ref.shape()[1],
+                                                                   encoded_ref.shape()[2],
+                                                                   encoded_ref.shape()[3]}));
+            }
+            if (sd_vid_gen_params->ref_audios_count == 1) {
+                if (sd->audio_encoder == nullptr) {
+                    LOG_ERROR("S2V audio conditioning requires --audio-encoder (wav2vec2)");
+                    return std::nullopt;
+                }
+                auto stacked = sd->get_audio_embedding(sd_vid_gen_params->ref_audios[0]);
+                if (stacked.empty()) {
+                    LOG_ERROR("failed to compute wav2vec2 embedding for driving audio");
+                    return std::nullopt;
+                }
+                int64_t latent_t        = sd->video_frames_to_latent_frames(request->frames);
+                int64_t batch_frames    = latent_t * 4;
+                latents.s2v_audio_embed = build_s2v_audio_window(stacked, batch_frames);
+                if (latents.s2v_audio_embed.empty()) {
+                    LOG_ERROR("failed to build S2V audio window");
+                    return std::nullopt;
+                }
+            }
+            int64_t t2 = ggml_time_ms();
+            LOG_INFO("s2v conditioning prepared, taking %" PRId64 " ms", t2 - t1);
         }
 
         if (latents.init_latent.empty()) {
@@ -1084,6 +1171,12 @@ namespace sd::pipeline {
                     latents.keyframe_indices);
             }
         }
+        if (sd->version == VERSION_WAN2_2_S2V) {
+            embeds.cond.c_ref_images = latents.ref_latents;
+            if (!latents.s2v_audio_embed.empty()) {
+                embeds.cond.c_ref_audios = {latents.s2v_audio_embed};
+            }
+        }
         if (request.use_uncond) {
             condition_params.text  = request.negative_prompt;
             embeds.uncond          = sd->cond_stage_model->get_learned_condition(sd->n_threads,
@@ -1096,6 +1189,12 @@ namespace sd::pipeline {
                 embeds.uncond.c_reference_blocks = latents.minimax_reference_blocks;
                 embeds.uncond.c_position_ids     = embeds.cond.c_position_ids;
             }
+            if (sd->version == VERSION_WAN2_2_S2V) {
+                embeds.uncond.c_ref_images = latents.ref_latents;
+                if (!latents.s2v_audio_embed.empty()) {
+                    embeds.uncond.c_ref_audios = {sd::Tensor<float>::zeros_like(latents.s2v_audio_embed)};
+                }
+            }
         }
 
         int64_t t1 = ggml_time_ms();
@@ -1422,10 +1521,14 @@ namespace sd::pipeline {
                         const sd_vid_gen_params_t* sd_vid_gen_params,
                         sd_image_t** frames_out,
                         int* num_frames_out,
-                        sd_audio_t** audio_out) {
+                        sd_audio_t** audio_out,
+                        int* fps_out) {
         if (sd->config_->animatediff_loaded && sd_version_supports_animatediff(sd->version)) {
             LOG_INFO("AnimateDiff dispatch: %d frames, %dx%d",
                      sd_vid_gen_params->video_frames, sd_vid_gen_params->width, sd_vid_gen_params->height);
+            if (fps_out != nullptr) {
+                *fps_out = std::max(1, sd_vid_gen_params->fps);
+            }
             return generate_animatediff_video(sd, sd_vid_gen_params, frames_out, num_frames_out);
         }
 
@@ -1437,6 +1540,9 @@ namespace sd::pipeline {
         sd->vae_tiling_params = sd_vid_gen_params->vae_tiling_params;
         sd->apply_circular_axes(sd_vid_gen_params->circular_x, sd_vid_gen_params->circular_y);
         GenerationRequest request(sd, sd_vid_gen_params);
+        if (fps_out != nullptr) {
+            *fps_out = request.fps;
+        }
         bool latent_upscale_enabled     = request.hires.enabled;
         GenerationRequest hires_request = request;
         if (latent_upscale_enabled) {
@@ -1725,6 +1831,33 @@ namespace sd::pipeline {
         LOG_INFO("generating latent video completed, taking %.2fs", (latent_end - latent_start) * 1.0f / 1000);
 
         sd_audio_t* generated_audio = nullptr;
+        if (sd->version == VERSION_WAN2_2_S2V && sd_vid_gen_params->ref_audios_count > 0) {
+            // Return the driving track for muxing with the generated video.
+            const sd_audio_t& driving = sd_vid_gen_params->ref_audios[0];
+            generated_audio           = (sd_audio_t*)malloc(sizeof(sd_audio_t));
+            if (generated_audio != nullptr) {
+                generated_audio->sample_rate  = driving.sample_rate;
+                generated_audio->channels     = driving.channels;
+                generated_audio->sample_count = driving.sample_count;
+                generated_audio->data         = (float*)malloc(sizeof(float) * driving.sample_count * driving.channels);
+                if (generated_audio->data == nullptr) {
+                    free(generated_audio);
+                    generated_audio = nullptr;
+                } else {
+                    memcpy(generated_audio->data,
+                           driving.data,
+                           sizeof(float) * driving.sample_count * driving.channels);
+                }
+            }
+            if (generated_audio != nullptr) {
+                LOG_DEBUG("s2v output audio: %u Hz, %u channels, %llu samples",
+                          generated_audio->sample_rate,
+                          generated_audio->channels,
+                          (unsigned long long)generated_audio->sample_count);
+            } else {
+                LOG_DEBUG("s2v output audio copy failed (out of memory)");
+            }
+        }
         if ((sd_version_is_ltxav(sd->version) || sd_version_is_minimax_h3(sd->version)) &&
             latents.audio_length > 0 &&
             sd->audio_vae_model != nullptr) {
@@ -1774,6 +1907,7 @@ namespace sd::pipeline {
             return false;
         }
         auto result = decode_video_outputs(sd, latent_upscale_enabled ? hires_request : request, final_latent, num_frames_out);
+        LOG_DEBUG("decode_video_outputs returned %s", result == nullptr ? "nullptr (failed)" : "frames");
         if (result == nullptr) {
             free_sd_audio(generated_audio);
             return false;
@@ -1786,6 +1920,20 @@ namespace sd::pipeline {
         if (frames_out != nullptr) {
             *frames_out = result;
         }
+        if (sd->version == VERSION_WAN2_2_S2V && generated_audio != nullptr) {
+            // Limit the driving track to the generated video's duration.
+            int fps               = request.fps;
+            uint64_t video_frames = num_frames_out != nullptr ? (uint64_t)*num_frames_out : 0;
+            uint64_t want_samples = (uint64_t)((double)video_frames / fps * generated_audio->sample_rate);
+            LOG_DEBUG("s2v audio truncate: %llu samples -> %llu (video %llu frames @ %d fps)",
+                      (unsigned long long)generated_audio->sample_count,
+                      (unsigned long long)want_samples,
+                      (unsigned long long)video_frames,
+                      fps);
+            if (want_samples > 0 && want_samples < generated_audio->sample_count) {
+                generated_audio->sample_count = want_samples;
+            }
+        }
         if (audio_out != nullptr) {
             *audio_out = generated_audio;
         } else {

src/runtime/audio_processing.cpp

@@ -0,0 +1,97 @@
+#include "audio_processing.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+#include <numeric>
+
+namespace sd::audio {
+
+    // Match torchaudio's Hann-windowed sinc resampler.
+    std::vector<float> resample_audio(const float* samples,
+                                      uint64_t sample_count,
+                                      uint32_t orig_sample_rate,
+                                      uint32_t target_sample_rate) {
+        if (samples == nullptr || sample_count == 0 || orig_sample_rate == 0 || target_sample_rate == 0) {
+            return {};
+        }
+        if (orig_sample_rate == target_sample_rate) {
+            return std::vector<float>(samples, samples + sample_count);
+        }
+
+        constexpr int kLowpassFilterWidth = 6;
+        constexpr double kRolloff         = 0.99;
+        constexpr double kPi              = 3.14159265358979323846;
+
+        const uint64_t gcd        = std::gcd(static_cast<uint64_t>(orig_sample_rate),
+                                             static_cast<uint64_t>(target_sample_rate));
+        const int64_t orig_freq   = static_cast<int64_t>(orig_sample_rate / gcd);
+        const int64_t new_freq    = static_cast<int64_t>(target_sample_rate / gcd);
+        const double base_freq    = static_cast<double>(std::min(orig_freq, new_freq)) * kRolloff;
+        const int64_t width       = static_cast<int64_t>(std::ceil(kLowpassFilterWidth * orig_freq / base_freq));
+        const int64_t kernel_size = 2 * width + orig_freq;
+
+        std::vector<double> kernel(static_cast<size_t>(new_freq) * kernel_size);
+        for (int64_t j = 0; j < new_freq; ++j) {
+            for (int64_t i = 0; i < kernel_size; ++i) {
+                double t = -static_cast<double>(j) / new_freq + static_cast<double>(i - width) / orig_freq;
+                t *= base_freq;
+                t                           = std::clamp(t, -static_cast<double>(kLowpassFilterWidth), static_cast<double>(kLowpassFilterWidth));
+                const double cos_arg        = std::cos(t * kPi / kLowpassFilterWidth / 2);
+                const double window         = cos_arg * cos_arg;
+                double s                    = t * kPi;
+                const double sinc           = (s == 0.0) ? 1.0 : std::sin(s) / s;
+                kernel[j * kernel_size + i] = sinc * window * (base_freq / orig_freq);
+            }
+        }
+
+        const uint64_t num_phases    = static_cast<uint64_t>(sample_count / orig_freq) + 1;
+        const uint64_t target_length = (static_cast<uint64_t>(new_freq) * sample_count +
+                                        static_cast<uint64_t>(orig_freq) - 1) /
+                                       static_cast<uint64_t>(orig_freq);
+        std::vector<float> out(target_length);
+        for (uint64_t phase = 0; phase < num_phases; ++phase) {
+            const int64_t src_base = static_cast<int64_t>(phase * orig_freq) - width;
+            for (int64_t j = 0; j < new_freq; ++j) {
+                const uint64_t out_index = phase * new_freq + j;
+                if (out_index >= target_length) {
+                    break;
+                }
+                const double* k = &kernel[j * kernel_size];
+                double acc      = 0.0;
+                for (int64_t i = 0; i < kernel_size; ++i) {
+                    const int64_t src = src_base + i;
+                    if (src >= 0 && src < static_cast<int64_t>(sample_count)) {
+                        acc += samples[src] * k[i];
+                    }
+                }
+                out[out_index] = static_cast<float>(acc);
+            }
+        }
+        return out;
+    }
+
+    std::vector<float> downmix_to_mono(const float* interleaved_samples,
+                                       uint64_t sample_count,
+                                       uint32_t channels) {
+        std::vector<float> mono;
+        if (interleaved_samples == nullptr || sample_count == 0 || channels == 0) {
+            return mono;
+        }
+        mono.resize(static_cast<size_t>(sample_count));
+        if (channels == 1) {
+            std::memcpy(mono.data(), interleaved_samples, static_cast<size_t>(sample_count) * sizeof(float));
+            return mono;
+        }
+        const float scale = 1.0f / static_cast<float>(channels);
+        for (uint64_t i = 0; i < sample_count; ++i) {
+            float sum = 0.0f;
+            for (uint32_t c = 0; c < channels; ++c) {
+                sum += interleaved_samples[i * channels + c];
+            }
+            mono[static_cast<size_t>(i)] = sum * scale;
+        }
+        return mono;
+    }
+
+}  // namespace sd::audio

src/runtime/audio_processing.h

@@ -0,0 +1,22 @@
+#ifndef __SD_RUNTIME_AUDIO_PROCESSING_H__
+#define __SD_RUNTIME_AUDIO_PROCESSING_H__
+
+#include <cstdint>
+#include <vector>
+
+namespace sd::audio {
+
+    // Returns the input unchanged when sample rates are equal, and an empty vector on invalid input.
+    std::vector<float> resample_audio(const float* samples,
+                                      uint64_t sample_count,
+                                      uint32_t orig_sample_rate,
+                                      uint32_t target_sample_rate);
+
+    // Average interleaved channels; return an empty vector on invalid input.
+    std::vector<float> downmix_to_mono(const float* interleaved_samples,
+                                       uint64_t sample_count,
+                                       uint32_t channels);
+
+}  // namespace sd::audio
+
+#endif  // __SD_RUNTIME_AUDIO_PROCESSING_H__

src/stable-diffusion.cpp

@@ -355,6 +355,7 @@ char* sd_ctx_params_to_str(const sd_ctx_params_t* sd_ctx_params) {
              "embeddings_connectors_path: %s\n"
              "vae_path: %s\n"
              "audio_vae_path: %s\n"
+             "audio_encoder_path: %s\n"
              "taesd_path: %s\n"
              "control_net_path: %s\n"
              "photo_maker_path: %s\n"
@@ -392,6 +393,7 @@ char* sd_ctx_params_to_str(const sd_ctx_params_t* sd_ctx_params) {
              SAFE_STR(sd_ctx_params->embeddings_connectors_path),
              SAFE_STR(sd_ctx_params->vae_path),
              SAFE_STR(sd_ctx_params->audio_vae_path),
+             SAFE_STR(sd_ctx_params->audio_encoder_path),
              SAFE_STR(sd_ctx_params->taesd_path),
              SAFE_STR(sd_ctx_params->control_net_path),
              SAFE_STR(sd_ctx_params->photo_maker_path),
@@ -736,8 +738,12 @@ SD_API bool generate_video(sd_ctx_t* sd_ctx,
                            const sd_vid_gen_params_t* sd_vid_gen_params,
                            sd_image_t** frames_out,
                            int* num_frames_out,
-                           sd_audio_t** audio_out) {
+                           sd_audio_t** audio_out,
+                           int* fps_out) {
     if (sd_ctx == nullptr || sd_ctx->sd == nullptr || sd_vid_gen_params == nullptr) {
+        if (fps_out != nullptr) {
+            *fps_out = 0;
+        }
         return false;
     }
 
@@ -753,10 +759,13 @@ SD_API bool generate_video(sd_ctx_t* sd_ctx,
 
     StableDiffusionGGML::ExecutionScope execution(*sd_ctx->sd);
     if (!execution.ready) {
+        if (fps_out != nullptr) {
+            *fps_out = 0;
+        }
         return false;
     }
 
-    return sd::pipeline::generate_video(sd_ctx->sd, sd_vid_gen_params, frames_out, num_frames_out, audio_out);
+    return sd::pipeline::generate_video(sd_ctx->sd, sd_vid_gen_params, frames_out, num_frames_out, audio_out, fps_out);
 }
 
 SD_API void free_sd_images(sd_image_t* result_images, int num_images) {