filters.c File Reference

Include dependency graph for filters.c:

Functions
static filter_t *	FindFilter (vlc_object_t *obj, const audio_sample_format_t *p_input_format, const audio_sample_format_t *p_output_format)
static int	SplitConversion (const audio_sample_format_t *restrict infmt, const audio_sample_format_t *restrict outfmt, audio_sample_format_t *midfmt)
	Splits audio format conversion in two simpler conversions.
int	aout_FiltersCreatePipeline (vlc_object_t *obj, filter_t **filters, int *nb_filters, const audio_sample_format_t *restrict infmt, const audio_sample_format_t *restrict outfmt)
	Allocates audio format conversion filters.
void	aout_FiltersDestroyPipeline (filter_t *const *filters, unsigned n)
	Destroys a chain of audio filters.
void	aout_FiltersPlay (filter_t *const *pp_filters, unsigned i_nb_filters, block_t **pp_block)
	Filters an audio buffer through a chain of filters.

---

Function Documentation

int aout_FiltersCreatePipeline	(	vlc_object_t *	obj,
		filter_t **	filters,
		int *	nb_filters,
		const audio_sample_format_t *restrict	infmt,
		const audio_sample_format_t *restrict	outfmt
	)

Allocates audio format conversion filters.

Parameters:

	obj	parent VLC object for new filters
	filters	table of filters [IN/OUT]
	nb_filters	pointer to the number of filters in the table [IN/OUT]
	infmt	input audio format
	outfmt	output audio format

Returns:

0 on success, -1 on failure

References _, aout_FiltersDestroyPipeline(), AOUT_FMTS_IDENTICAL, aout_FormatsPrint, dialog_Fatal, FindFilter(), msg_Dbg, msg_Err, and SplitConversion().

void aout_FiltersDestroyPipeline	(	filter_t *const *	filters,
		unsigned	n
	)

Destroys a chain of audio filters.

References module_unneed, filter_t::p_module, filter_t::p_owner, and vlc_object_release.

Referenced by aout_FiltersCreatePipeline(), aout_InputDelete(), aout_InputNew(), and aout_OutputDelete().

void aout_FiltersPlay	(	filter_t *const *	pp_filters,
		unsigned	i_nb_filters,
		block_t **	pp_block
	)

Filters an audio buffer through a chain of filters.

Referenced by aout_InputPlay(), and aout_OutputPlay().

static filter_t* FindFilter	(	vlc_object_t *	obj,
		const audio_sample_format_t *	p_input_format,
		const audio_sample_format_t *	p_output_format
	)			[static]

References es_format_t::audio, filter_t::fmt_in, filter_t::fmt_out, es_format_t::i_codec, audio_format_t::i_format, module_need, filter_t::p_module, filter_t::p_owner, vlc_custom_create, and vlc_object_release.

Referenced by aout_FiltersCreatePipeline().

static int SplitConversion	(	const audio_sample_format_t *restrict	infmt,
		const audio_sample_format_t *restrict	outfmt,
		audio_sample_format_t *	midfmt
	)			[static]

Splits audio format conversion in two simpler conversions.

Returns:

0 on successful split, -1 if the input and output formats are too similar to split the conversion.

References AOUT_FMT_LINEAR, AOUT_FMTS_IDENTICAL, aout_FormatPrepare(), HAVE_FPU, audio_format_t::i_format, audio_format_t::i_original_channels, audio_format_t::i_physical_channels, audio_format_t::i_rate, and VLC_CODEC_FL32.

Referenced by aout_FiltersCreatePipeline().