swr: add native matrix for rematrixing

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/rematrix.c

@@ -253,12 +253,30 @@ static int auto_matrix(SwrContext *s)
 
 int swri_rematrix_init(SwrContext *s){
     int i, j;
+    int nb_in  = av_get_channel_layout_nb_channels(s->in_ch_layout);
+    int nb_out = av_get_channel_layout_nb_channels(s->out_ch_layout);
 
     if (!s->rematrix_custom) {
         int r = auto_matrix(s);
         if (r)
             return r;
     }
+    if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){
+        s->native_matrix = av_mallocz(nb_in * nb_out * sizeof(int));
+        s->native_one    = av_mallocz(sizeof(int));
+        for (i = 0; i < nb_out; i++)
+            for (j = 0; j < nb_in; j++)
+                ((int*)s->native_matrix)[i * nb_in + j] = lrintf(s->matrix[i][j] * 32768);
+        *((int*)s->native_one) = 32768;
+    }else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
+        s->native_matrix = av_mallocz(nb_in * nb_out * sizeof(float));
+        s->native_one    = av_mallocz(sizeof(float));
+        for (i = 0; i < nb_out; i++)
+            for (j = 0; j < nb_in; j++)
+                ((float*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
+        *((float*)s->native_one) = 1.0;
+    }else
+        av_assert0(0);
     //FIXME quantize for integeres
     for (i = 0; i < SWR_CH_MAX; i++) {
         int ch_in=0;
@@ -281,6 +299,11 @@ void swri_sum2(enum AVSampleFormat format, void *dst, const void *src0, const vo
     }
 }
 
+void swri_rematrix_free(SwrContext *s){
+    av_freep(&s->native_matrix);
+    av_freep(&s->native_one);
+}
+
 int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy){
     int out_i, in_i, i, j;
 

libswresample/swresample.c

@@ -176,6 +176,7 @@ void swr_free(SwrContext **ss){
         swri_audio_convert_free(&s->out_convert);
         swri_audio_convert_free(&s->full_convert);
         swri_resample_free(&s->resample);
+        swri_rematrix_free(s);
     }
 
     av_freep(ss);
@@ -193,6 +194,7 @@ int swr_init(struct SwrContext *s){
     swri_audio_convert_free(&s-> in_convert);
     swri_audio_convert_free(&s->out_convert);
     swri_audio_convert_free(&s->full_convert);
+    swri_rematrix_free(s);
 
     s->flushed = 0;
 

libswresample/swresample_internal.h

@@ -80,6 +80,8 @@ struct SwrContext {
     struct ResampleContext *resample;               ///< resampling context
 
     float matrix[SWR_CH_MAX][SWR_CH_MAX];           ///< floating point rematrixing coefficients
+    uint8_t *native_matrix;
+    uint8_t *native_one;
     int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX];       ///< 17.15 fixed point rematrixing coefficients
     uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1];    ///< Lists of input channels per output channel that have non zero rematrixing coefficients
 
@@ -96,6 +98,7 @@ int swri_resample_float(struct ResampleContext *c, float   *dst, const float   *
 int swri_resample_double(struct ResampleContext *c,double  *dst, const double  *src, int *consumed, int src_size, int dst_size, int update_ctx);
 
 int swri_rematrix_init(SwrContext *s);
+void swri_rematrix_free(SwrContext *s);
 int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
 void swri_sum2(enum AVSampleFormat format, void *dst, const void *src0, const void *src1, float coef0, float coef1, int len);