move audio sample calculator to mlt_frame and use from ffmpeg and mcmpeg, add mlt_fra...

[melted] / src / framework / mlt_frame.c

diff --git a/src/framework/mlt_frame.c b/src/framework/mlt_frame.c
index dd17983..5a5701a 100644 (file)
--- a/src/framework/mlt_frame.c
+++ b/src/framework/mlt_frame.c
@@ -688,3 +688,78 @@ uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
        return input;
 }
 
+int mlt_frame_mix_audio( mlt_frame this, mlt_frame that, float weight, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
+{
+       int ret = 0;
+       int16_t *p_src, *p_dest;
+       int frequency_src, frequency_dest;
+       int channels_src, channels_dest;
+       int samples_src, samples_dest;
+       int i, j;
+
+       mlt_frame_get_audio( this, &p_dest, format, &frequency_dest, &channels_dest, &samples_dest );
+       mlt_frame_get_audio( that, &p_src, format, &frequency_src, &channels_src, &samples_src );
+
+       *samples = samples_src < samples_dest ? samples_src : samples_dest;
+       *channels = channels_src < channels_dest ? channels_src : channels_dest;
+       *buffer = p_dest;
+
+       for ( i = 0; i < *samples; i++ )
+       {
+               for ( j = 0; j < *channels; j++ )
+               {
+                       double dest = (double) p_dest[ i * channels_dest + j ];
+                       double src = (double) p_src[ i * channels_src + j ];
+                       p_dest[ i * channels_dest + j ] = src * weight + dest * ( 1.0 - weight );
+               }
+       }
+       
+       return ret;
+}
+
+int mlt_sample_calculator( float fps, int frequency, int64_t position )
+{
+       int samples = 0;
+
+       if ( fps > 29 && fps <= 30 )
+       {
+               samples = frequency / 30;
+
+               switch ( frequency )
+               {
+                       case 48000:
+                               if ( position % 5 != 0 )
+                                       samples += 2;
+                               break;
+                       case 44100:
+                               if ( position % 300 == 0 )
+                                       samples = 1471;
+                               else if ( position % 30 == 0 )
+                                       samples = 1470;
+                               else if ( position % 2 == 0 )
+                                       samples = 1472;
+                               else
+                                       samples = 1471;
+                               break;
+                       case 32000:
+                               if ( position % 30 == 0 )
+                                       samples = 1068;
+                               else if ( position % 29 == 0 )
+                                       samples = 1067;
+                               else if ( position % 4 == 2 )
+                                       samples = 1067;
+                               else
+                                       samples = 1068;
+                               break;
+                       default:
+                               samples = 0;
+               }
+       }
+       else if ( fps != 0 )
+       {
+               samples = frequency / fps;
+       }
+
+       return samples;
+}
+