audio_data.h File Reference

#include <stdint.h>
#include "libavutil/audio_fifo.h"
#include "libavutil/log.h"
#include "libavutil/samplefmt.h"
#include "avresample.h"
#include "internal.h"

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Data Structures
struct	AudioData
	Audio buffer used for intermediate storage between conversion phases. More...

Functions
int	ff_audio_data_set_channels (AudioData *a, int channels)
int	ff_audio_data_init (AudioData *a, uint8_t **src, int plane_size, int channels, int nb_samples, enum AVSampleFormat sample_fmt, int read_only, const char *name)
	Initialize AudioData using a given source. More...
AudioData *	ff_audio_data_alloc (int channels, int nb_samples, enum AVSampleFormat sample_fmt, const char *name)
	Allocate AudioData. More...
int	ff_audio_data_realloc (AudioData *a, int nb_samples)
	Reallocate AudioData. More...
void	ff_audio_data_free (AudioData **a)
	Free AudioData. More...
int	ff_audio_data_copy (AudioData *out, AudioData *in, ChannelMapInfo *map)
	Copy data from one AudioData to another. More...
int	ff_audio_data_combine (AudioData *dst, int dst_offset, AudioData *src, int src_offset, int nb_samples)
	Append data from one AudioData to the end of another. More...
void	ff_audio_data_drain (AudioData *a, int nb_samples)
	Drain samples from the start of the AudioData. More...
int	ff_audio_data_add_to_fifo (AVAudioFifo *af, AudioData *a, int offset, int nb_samples)
	Add samples in AudioData to an AVAudioFifo. More...
int	ff_audio_data_read_from_fifo (AVAudioFifo *af, AudioData *a, int nb_samples)
	Read samples from an AVAudioFifo to AudioData. More...

Function Documentation

int ff_audio_data_add_to_fifo	(	AVAudioFifo *	af,
		AudioData *	a,
		int	offset,
		int	nb_samples
	)

Add samples in AudioData to an AVAudioFifo.

Parameters

af	Audio FIFO Buffer
a	AudioData struct
offset	number of samples to skip from the start of the data
nb_samples	number of samples to add to the FIFO

Returns

number of samples actually added to the FIFO, or negative AVERROR code on error

Definition at line 342 of file audio_data.c.

Referenced by avresample_set_compensation(), and handle_buffered_output().

AudioData* ff_audio_data_alloc	(	int	channels,
		int	nb_samples,
		enum AVSampleFormat	sample_fmt,
		const char *	name
	)

Allocate AudioData.

This allocates an internal buffer and sets audio parameters.

Parameters

channels	channel count
nb_samples	number of samples to allocate space for
sample_fmt	sample format
name	name for debug logging (can be NULL)

Returns

newly allocated AudioData struct, or NULL on error

Definition at line 110 of file audio_data.c.

Referenced by avresample_open(), avresample_set_compensation(), ff_audio_resample_init(), and ff_dither_alloc().

int ff_audio_data_combine	(	AudioData *	dst,
		int	dst_offset,
		AudioData *	src,
		int	src_offset,
		int	nb_samples
	)

Append data from one AudioData to the end of another.

Parameters

dst	destination AudioData
dst_offset	offset, in samples, to start writing, relative to the start of dst
src	source AudioData
src_offset	offset, in samples, to start copying, relative to the start of the src
nb_samples	number of samples to copy

Returns

0 on success, negative AVERROR value on error

Definition at line 269 of file audio_data.c.

Referenced by ff_audio_resample().

int ff_audio_data_copy	(	AudioData *	out,
		AudioData *	in,
		ChannelMapInfo *	map
	)

Copy data from one AudioData to another.

Parameters

out	output AudioData
in	input AudioData
map	channel map, NULL if not remapping

Returns

0 on success, negative AVERROR value on error

Definition at line 216 of file audio_data.c.

Referenced by avresample_convert(), ff_convert_dither(), and handle_buffered_output().

void ff_audio_data_drain	(	AudioData *	a,
		int	nb_samples
	)

Drain samples from the start of the AudioData.

Remaining samples are shifted to the start of the AudioData.

Parameters

a	AudioData struct
nb_samples	number of samples to drain

Definition at line 325 of file audio_data.c.

Referenced by ff_audio_resample().

void ff_audio_data_free

(

AudioData **

a

)

Free AudioData.

The AudioData must have been previously allocated with ff_audio_data_alloc().

Parameters

a	AudioData struct

Definition at line 208 of file audio_data.c.

Referenced by avresample_close(), avresample_set_compensation(), ff_audio_resample_free(), ff_audio_resample_init(), and ff_dither_free().

int ff_audio_data_init	(	AudioData *	a,
		uint8_t **	src,
		int	plane_size,
		int	channels,
		int	nb_samples,
		enum AVSampleFormat	sample_fmt,
		int	read_only,
		const char *	name
	)

Initialize AudioData using a given source.

This does not allocate an internal buffer. It only sets the data pointers and audio parameters.

Parameters

a	AudioData struct
src	source data pointers
plane_size	plane size, in bytes. This can be 0 if unknown, but that will lead to optimized functions not being used in many cases, which could slow down some conversions.
channels	channel count
nb_samples	number of samples in the source data
sample_fmt	sample format
read_only	indicates if buffer is read only or read/write
name	name for debug logging (can be NULL)

Returns

0 on success, negative AVERROR value on error

Definition at line 65 of file audio_data.c.

Referenced by avresample_convert().

int ff_audio_data_read_from_fifo	(	AVAudioFifo *	af,
		AudioData *	a,
		int	nb_samples
	)

Read samples from an AVAudioFifo to AudioData.

Parameters

af	Audio FIFO Buffer
a	AudioData struct
nb_samples	number of samples to read from the FIFO

Returns

number of samples actually read from the FIFO, or negative AVERROR code on error

Definition at line 357 of file audio_data.c.

Referenced by avresample_set_compensation(), and handle_buffered_output().

int ff_audio_data_realloc	(	AudioData *	a,
		int	nb_samples
	)

Reallocate AudioData.

The AudioData must have been previously allocated with ff_audio_data_alloc().

Parameters

a	AudioData struct
nb_samples	number of samples to allocate space for

Returns

0 on success, negative AVERROR value on error

Definition at line 153 of file audio_data.c.

Referenced by avresample_convert(), ff_audio_data_alloc(), ff_audio_data_combine(), ff_audio_data_copy(), ff_audio_data_read_from_fifo(), ff_audio_resample(), and ff_convert_dither().

int ff_audio_data_set_channels	(	AudioData *	a,
		int	channels
	)

Definition at line 51 of file audio_data.c.

Referenced by avresample_convert(), and ff_audio_mix().