sync from b7516

tools/mtmd/mtmd-audio.h

@@ -17,38 +17,6 @@ struct mtmd_audio_mel {
     std::vector<float> data;
 };
 
-struct mtmd_audio_mel_filters {
-    int32_t n_mel;
-    int32_t n_fft;
-
-    std::vector<float> data;
-};
-
-// cache for audio processing, each processor instance owns its own cache
-struct mtmd_audio_cache {
-    std::vector<float> sin_vals;
-    std::vector<float> cos_vals;
-
-    std::vector<float> hann_window;
-
-    mtmd_audio_mel_filters filters;
-
-    void fill_sin_cos_table(int n);
-
-    void fill_hann_window(int length, bool periodic);
-
-    // Build mel filterbank matrix [n_mel × n_fft_bins] at runtime.
-    // n_fft_bins must be (N_fft / 2 + 1). Example: if N_fft=512 -> n_fft_bins=257.
-    void fill_mel_filterbank_matrix(int   n_mel,
-                                    int   n_fft,
-                                    int   sample_rate,               // e.g. 16000
-                                    float fmin             = 0.0f,   // e.g. 0.0
-                                    float fmax             = -1.0f,  // e.g. sr/2; pass -1 for auto
-                                    bool  slaney_area_norm = true,
-                                    float scale = 1.0f  // optional extra scaling
-    );
-};
-
 struct mtmd_audio_preprocessor {
     const clip_hparams & hparams;
 
@@ -63,51 +31,10 @@ struct mtmd_audio_preprocessor_whisper : mtmd_audio_preprocessor {
     mtmd_audio_preprocessor_whisper(const clip_ctx * ctx) : mtmd_audio_preprocessor(ctx) {}
     void initialize() override;
     bool preprocess(const float * samples, size_t n_samples, std::vector<mtmd_audio_mel> & output) override;
-
-  private:
-    mtmd_audio_cache cache;
 };
 
 struct mtmd_audio_preprocessor_conformer : mtmd_audio_preprocessor {
     mtmd_audio_preprocessor_conformer(const clip_ctx * ctx) : mtmd_audio_preprocessor(ctx) {}
     void initialize() override;
     bool preprocess(const float * samples, size_t n_samples, std::vector<mtmd_audio_mel> & output) override;
-
-  private:
-    mtmd_audio_cache cache;
-};
-
-//
-// streaming ISTFT - converts spectrogram frames back to audio one frame at a time
-//
-struct mtmd_audio_streaming_istft {
-    mtmd_audio_streaming_istft(int n_fft, int hop_length);
-
-    // reset streaming state
-    void reset();
-
-    // process a single STFT frame (streaming)
-    // frame_spectrum: [n_fft_bins x 2] interleaved real/imag
-    // returns: up to hop_length samples
-    std::vector<float> process_frame(const float * frame_spectrum);
-
-    // flush remaining samples at end of stream
-    std::vector<float> flush();
-
-  private:
-    int n_fft;
-    int hop_length;
-    int n_fft_bins;
-
-    // Own cache for output processing
-    mtmd_audio_cache cache;
-
-    // Streaming state
-    std::vector<float> overlap_buffer;
-    std::vector<float> window_sum_buffer;
-    int                padding_to_remove;
-
-    // Working buffers for IFFT
-    std::vector<float> ifft_in;
-    std::vector<float> ifft_out;
 };