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

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.

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

int	ff_audio_data_realloc (AudioData *a, int nb_samples)
	Reallocate AudioData.

void	ff_audio_data_free (AudioData **a)
	Free AudioData.

int	ff_audio_data_copy (AudioData out, AudioData in, ChannelMapInfo *map)
	Copy data from one AudioData to another.

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.

void	ff_audio_data_drain (AudioData *a, int nb_samples)
	Drain samples from the start of the AudioData.

int	ff_audio_data_add_to_fifo (AVAudioFifo af, AudioData a, int offset, int nb_samples)
	Add samples in AudioData to an AVAudioFifo.

int	ff_audio_data_read_from_fifo (AVAudioFifo af, AudioData a, int nb_samples)
	Read samples from an AVAudioFifo to AudioData.

Function Documentation

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().

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().

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_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().

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_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().

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().

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().

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().

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().

Data Structures

Functions

Function Documentation