/*****************************************************************************
* aout_FiltersCreatePipeline: create a filters pipeline to transform a sample
* format to another
*****************************************************************************
* TODO : allow the user to add/remove specific filters
*****************************************************************************/
int aout_FiltersCreatePipeline( aout_instance_t * p_aout,
aout_filter_t ** pp_filters,
int * pi_nb_filters,
const audio_sample_format_t * p_input_format,
const audio_sample_format_t * p_output_format )
{
audio_sample_format_t temp_format;
int i_nb_conversions;
if ( AOUT_FMTS_IDENTICAL( p_input_format, p_output_format ) )
{
msg_Dbg( p_aout, "no need for any filter" );
*pi_nb_filters = 0;
return 0;
}
aout_FormatsPrint( p_aout, "filter(s)", p_input_format, p_output_format );
/* Try to find a filter to do the whole conversion. */
pp_filters[0] = FindFilter( p_aout, p_input_format, p_output_format );
if ( pp_filters[0] != NULL )
{
msg_Dbg( p_aout, "found a filter for the whole conversion" );
*pi_nb_filters = 1;
return 0;
}
/* We'll have to split the conversion. We always do the downmixing
* before the resampling, because the audio decoder can probably do it
* for us. */
i_nb_conversions = SplitConversion( p_input_format,
p_output_format, &temp_format );
if ( !i_nb_conversions )
{
/* There was only one conversion to do, and we already failed. */
msg_Err( p_aout, "couldn't find a filter for the conversion" );
return -1;
}
pp_filters[0] = FindFilter( p_aout, p_input_format, &temp_format );
if ( pp_filters[0] == NULL && i_nb_conversions == 2 )
{
/* Try with only one conversion. */
SplitConversion( p_input_format, &temp_format, &temp_format );
pp_filters[0] = FindFilter( p_aout, p_input_format, &temp_format );
}
if ( pp_filters[0] == NULL )
{
msg_Err( p_aout,
"couldn't find a filter for the first part of the conversion" );
return -1;
}
/* We have the first stage of the conversion. Find a filter for
* the rest. */
pp_filters[1] = FindFilter( p_aout, &pp_filters[0]->output,
p_output_format );
if ( pp_filters[1] == NULL )
{
/* Try to split the conversion. */
i_nb_conversions = SplitConversion( &pp_filters[0]->output,
p_output_format, &temp_format );
if ( !i_nb_conversions )
{
vlc_object_detach( pp_filters[0] );
vlc_object_destroy( pp_filters[0] );
msg_Err( p_aout,
"couldn't find a filter for the second part of the conversion" );
}
pp_filters[1] = FindFilter( p_aout, &pp_filters[0]->output,
&temp_format );
pp_filters[2] = FindFilter( p_aout, &temp_format,
p_output_format );
if ( pp_filters[1] == NULL || pp_filters[2] == NULL )
{
vlc_object_detach( pp_filters[0] );
vlc_object_destroy( pp_filters[0] );
if ( pp_filters[1] != NULL )
{
vlc_object_detach( pp_filters[1] );
vlc_object_destroy( pp_filters[1] );
}
if ( pp_filters[2] != NULL )
{
vlc_object_detach( pp_filters[2] );
vlc_object_destroy( pp_filters[2] );
}
msg_Err( p_aout,
"couldn't find filters for the second part of the conversion" );
}
*pi_nb_filters = 3;
}
else
{
*pi_nb_filters = 2;
}
/* We have enough filters. */
msg_Dbg( p_aout, "found %d filters for the whole conversion",
*pi_nb_filters );
return 0;
}
/*****************************************************************************
* aout_FiltersCreatePipeline: create a filters pipeline to transform a sample
* format to another
*****************************************************************************
* pi_nb_filters must be initialized before calling this function
*****************************************************************************/
int aout_FiltersCreatePipeline( aout_instance_t * p_aout,
aout_filter_t ** pp_filters_start,
int * pi_nb_filters,
const audio_sample_format_t * p_input_format,
const audio_sample_format_t * p_output_format )
{
aout_filter_t** pp_filters = pp_filters_start + *pi_nb_filters;
audio_sample_format_t temp_format;
int i_nb_conversions;
if ( AOUT_FMTS_IDENTICAL( p_input_format, p_output_format ) )
{
msg_Dbg( p_aout, "no need for any filter" );
return 0;
}
aout_FormatsPrint( p_aout, "filter(s)", p_input_format, p_output_format );
if( *pi_nb_filters + 1 > AOUT_MAX_FILTERS )
{
msg_Err( p_aout, "max filter reached (%d)", AOUT_MAX_FILTERS );
return -1;
}
/* Try to find a filter to do the whole conversion. */
pp_filters[0] = FindFilter( p_aout, p_input_format, p_output_format );
if ( pp_filters[0] != NULL )
{
msg_Dbg( p_aout, "found a filter for the whole conversion" );
++*pi_nb_filters;
return 0;
}
/* We'll have to split the conversion. We always do the downmixing
* before the resampling, because the audio decoder can probably do it
* for us. */
i_nb_conversions = SplitConversion( p_input_format,
p_output_format, &temp_format );
if ( !i_nb_conversions )
{
/* There was only one conversion to do, and we already failed. */
msg_Err( p_aout, "couldn't find a filter for the conversion" );
return -1;
}
pp_filters[0] = FindFilter( p_aout, p_input_format, &temp_format );
if ( pp_filters[0] == NULL && i_nb_conversions == 2 )
{
/* Try with only one conversion. */
SplitConversion( p_input_format, &temp_format, &temp_format );
pp_filters[0] = FindFilter( p_aout, p_input_format, &temp_format );
}
if ( pp_filters[0] == NULL )
{
msg_Err( p_aout,
"couldn't find a filter for the first part of the conversion" );
return -1;
}
/* We have the first stage of the conversion. Find a filter for
* the rest. */
if( *pi_nb_filters + 2 > AOUT_MAX_FILTERS )
{
ReleaseFilter( pp_filters[0] );
msg_Err( p_aout, "max filter reached (%d)", AOUT_MAX_FILTERS );
return -1;
}
pp_filters[1] = FindFilter( p_aout, &pp_filters[0]->output,
p_output_format );
if ( pp_filters[1] == NULL )
{
/* Try to split the conversion. */
i_nb_conversions = SplitConversion( &pp_filters[0]->output,
p_output_format, &temp_format );
if ( !i_nb_conversions )
{
ReleaseFilter( pp_filters[0] );
msg_Err( p_aout,
"couldn't find a filter for the second part of the conversion" );
return -1;
}
if( *pi_nb_filters + 3 > AOUT_MAX_FILTERS )
{
ReleaseFilter( pp_filters[0] );
msg_Err( p_aout, "max filter reached (%d)", AOUT_MAX_FILTERS );
return -1;
}
pp_filters[1] = FindFilter( p_aout, &pp_filters[0]->output,
&temp_format );
pp_filters[2] = FindFilter( p_aout, &temp_format,
p_output_format );
if ( pp_filters[1] == NULL || pp_filters[2] == NULL )
{
ReleaseFilter( pp_filters[0] );
if ( pp_filters[1] != NULL )
{
ReleaseFilter( pp_filters[1] );
}
if ( pp_filters[2] != NULL )
{
ReleaseFilter( pp_filters[2] );
}
msg_Err( p_aout,
"couldn't find filters for the second part of the conversion" );
return -1;
}
*pi_nb_filters += 3;
msg_Dbg( p_aout, "found 3 filters for the whole conversion" );
}
else
{
*pi_nb_filters += 2;
msg_Dbg( p_aout, "found 2 filters for the whole conversion" );
}
return 0;
}
