static int filter_get_audio( mlt_frame frame, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
{
mlt_filter filter = mlt_frame_pop_audio( frame );
private_data* pdata = (private_data*)filter->child;
mlt_position pos = mlt_frame_get_position( frame );
// Get the producer's audio
*format = mlt_audio_f32le;
mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
check_for_reset( filter, *channels, *frequency );
if( pos != pdata->prev_pos )
{
// Only analyze the audio if the producer is not paused.
analyze_audio( filter, *buffer, *samples );
}
pdata->prev_pos = pos;
mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
return 0;
}
static int filter_get_audio( mlt_frame frame, void **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
{
mlt_filter filter = mlt_frame_pop_audio( frame );
private_data* pdata = (private_data*)filter->child;
mlt_position o_pos = mlt_frame_original_position( frame );
// Get the producer's audio
*format = mlt_audio_f32le;
mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
if( abs( o_pos - pdata->prev_o_pos ) > 1 )
{
// Assume this is a new clip and restart
// Use original position so that transitions between clips are detected.
pdata->reset = 1;
mlt_log_info( MLT_FILTER_SERVICE( filter ), "Reset. Old Pos: %d\tNew Pos: %d\n", pdata->prev_o_pos, o_pos );
}
check_for_reset( filter, *channels, *frequency );
if( o_pos != pdata->prev_o_pos )
{
// Only analyze the audio is the producer is not paused.
analyze_audio( filter, *buffer, *samples, *frequency );
}
double start_coeff = pdata->start_gain > -90.0 ? pow(10.0, pdata->start_gain / 20.0) : 0.0;
double end_coeff = pdata->end_gain > -90.0 ? pow(10.0, pdata->end_gain / 20.0) : 0.0;
double coeff_factor = pow( (end_coeff / start_coeff), 1.0 / (double)*samples );
double coeff = start_coeff;
float* p = *buffer;
int s = 0;
int c = 0;
for( s = 0; s < *samples; s++ )
{
coeff = coeff * coeff_factor;
for ( c = 0; c < *channels; c++ )
{
*p = *p * coeff;
p++;
}
}
pdata->prev_o_pos = o_pos;
mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
return 0;
}
