// Parse the header for meta info
dv_parse_header( decoder, dv_data );
- // Obtain required values
- *frequency = decoder->audio->frequency;
- *samples = decoder->audio->samples_this_frame;
- *channels = decoder->audio->num_channels;
-
- // Create a temporary workspace
- for ( i = 0; i < 4; i++ )
- audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
-
- // Create a workspace for the result
- *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
-
- // Pass the allocated audio buffer as a property
- mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
-
- // Decode the audio
- dv_decode_full_audio( decoder, dv_data, audio_channels );
+ // Check that we have audio
+ if ( decoder->audio->num_channels > 0 )
+ {
+ // Obtain required values
+ *frequency = decoder->audio->frequency;
+ *samples = decoder->audio->samples_this_frame;
+ *channels = decoder->audio->num_channels;
+
+ // Create a temporary workspace
+ for ( i = 0; i < 4; i++ )
+ audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
+
+ // Create a workspace for the result
+ *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
+
+ // Pass the allocated audio buffer as a property
+ mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
- // Interleave the audio
- p = *buffer;
- for ( i = 0; i < *samples; i++ )
- for ( j = 0; j < *channels; j++ )
- *p++ = audio_channels[ j ][ i ];
-
- // Free the temporary work space
- for ( i = 0; i < 4; i++ )
- mlt_pool_release( audio_channels[ i ] );
+ // Decode the audio
+ dv_decode_full_audio( decoder, dv_data, audio_channels );
+
+ // Interleave the audio
+ p = *buffer;
+ for ( i = 0; i < *samples; i++ )
+ for ( j = 0; j < *channels; j++ )
+ *p++ = audio_channels[ j ][ i ];
+
+ // Free the temporary work space
+ for ( i = 0; i < 4; i++ )
+ mlt_pool_release( audio_channels[ i ] );
+ }
+ else
+ {
+ // No audio available on the frame, so get test audio (silence)
+ this->get_audio = NULL;
+ mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
+ }
return 0;
}