shithub: aubio

Info  •  Files  •  Log  •  Branches

[source] [avcodec] downmix signal manually

--- a/src/io/source_avcodec.c

+++ b/src/io/source_avcodec.c

@@ -310,8 +310,7 @@

   if ( (multi != s->multi) || (s->avr == NULL) ) {

     int err;

     int64_t input_layout = av_get_default_channel_layout(s->input_channels);

-    uint_t output_channels = multi ? s->input_channels : 1;

-    int64_t output_layout = av_get_default_channel_layout(output_channels);

+    int64_t output_layout = av_get_default_channel_layout(s->input_channels);

 #ifdef HAVE_AVRESAMPLE

     AVAudioResampleContext *avr = avresample_alloc_context();

     AVAudioResampleContext *oldavr = s->avr;

@@ -503,7 +502,12 @@

   while (total_wrote < s->hop_size) {

     end = MIN(s->read_samples - s->read_index, s->hop_size - total_wrote);

     for (i = 0; i < end; i++) {

-      read_data->data[i + total_wrote] = s->output[i + s->read_index];

+      read_data->data[i + total_wrote] = 0.;

+      for (j = 0; j < s->input_channels; j++) {

+        read_data->data[i + total_wrote] +=

+          s->output[(i + s->read_index) * s->input_channels + j];

+      }

+      read_data->data[i + total_wrote] *= 1./s->input_channels;

     }

     total_wrote += end;

     if (total_wrote < s->hop_size) {