libavcodec/audioconvert.h File Reference

Audio format conversion routines. More...

#include "avcodec.h"

Go to the source code of this file.

Typedefs
typedef struct AVAudioConvert	AVAudioConvert
Functions
void	avcodec_sample_fmt_string (char *buf, int buf_size, int sample_fmt)
	Generate string corresponding to the sample format with number sample_fmt, or a header if sample_fmt is negative.
const char *	avcodec_get_sample_fmt_name (int sample_fmt)
enum SampleFormat	avcodec_get_sample_fmt (const char *name)
const char *	avcodec_get_channel_name (int channel_id)
void	avcodec_get_channel_layout_string (char *buf, int buf_size, int nb_channels, int64_t channel_layout)
	Return description of channel layout.
int64_t	avcodec_guess_channel_layout (int nb_channels, enum CodecID codec_id, const char *fmt_name)
	Guess the channel layout.
AVAudioConvert *	av_audio_convert_alloc (enum SampleFormat out_fmt, int out_channels, enum SampleFormat in_fmt, int in_channels, const float *matrix, int flags)
	Create an audio sample format converter context.
void	av_audio_convert_free (AVAudioConvert *ctx)
	Free audio sample format converter context.
int	av_audio_convert (AVAudioConvert *ctx, void *const out[6], const int out_stride[6], const void *const in[6], const int in_stride[6], int len)
	Convert between audio sample formats.

---

Detailed Description

Audio format conversion routines.

Definition in file audioconvert.h.

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Typedef Documentation

typedef struct AVAudioConvert AVAudioConvert

Definition at line 78 of file audioconvert.h.

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Function Documentation

int av_audio_convert	(	AVAudioConvert *	ctx,
		void *const	out[6],
		const int	out_stride[6],
		const void *const	in[6],
		const int	in_stride[6],
		int	len
	)

Convert between audio sample formats.

Parameters:

[in]	out	array of output buffers for each channel. set to NULL to ignore processing of the given channel.
[in]	out_stride	distance between consecutive input samples (measured in bytes)
[in]	in	array of input buffers for each channel
[in]	in_stride	distance between consecutive output samples (measured in bytes)
	len	length of audio frame size (measured in samples)

Definition at line 179 of file audioconvert.c.

Referenced by audio_decode_frame(), audio_resample(), and do_audio_out().

AVAudioConvert* av_audio_convert_alloc	(	enum SampleFormat	out_fmt,
		int	out_channels,
		enum SampleFormat	in_fmt,
		int	in_channels,
		const float *	matrix,
		int	flags
	)

Create an audio sample format converter context.

Parameters:

	out_fmt	Output sample format
	out_channels	Number of output channels
	in_fmt	Input sample format
	in_channels	Number of input channels
[in]	matrix	Channel mixing matrix (of dimension in_channel*out_channels). Set to NULL to ignore.
	flags	See FF_MM_xx

Returns:

NULL on error

Definition at line 158 of file audioconvert.c.

Referenced by audio_decode_frame(), av_audio_resample_init(), and do_audio_out().

void av_audio_convert_free

(

AVAudioConvert *

ctx

)

Free audio sample format converter context.

Definition at line 174 of file audioconvert.c.

Referenced by audio_decode_frame(), audio_resample_close(), av_audio_resample_init(), av_encode(), do_audio_out(), and stream_component_close().

void avcodec_get_channel_layout_string	(	char *	buf,
		int	buf_size,
		int	nb_channels,
		int64_t	channel_layout
	)

Return description of channel layout.

Definition at line 121 of file audioconvert.c.

Referenced by avcodec_string().

const char* avcodec_get_channel_name

(

int

channel_id

)

Returns:

NULL on error

enum SampleFormat avcodec_get_sample_fmt

(

const char *

name

)

Returns:

SAMPLE_FMT_NONE on error

Definition at line 53 of file audioconvert.c.

Referenced by opt_audio_sample_fmt().

const char* avcodec_get_sample_fmt_name

(

int

sample_fmt

)

Returns:

NULL on error

Definition at line 46 of file audioconvert.c.

Referenced by audio_decode_frame(), av_audio_resample_init(), avcodec_string(), and do_audio_out().

int64_t avcodec_guess_channel_layout	(	int	nb_channels,
		enum CodecID	codec_id,
		const char *	fmt_name
	)

Guess the channel layout.

Parameters:

	nb_channels
	codec_id	Codec identifier, or CODEC_ID_NONE if unknown
	fmt_name	Format name, or NULL if unknown

Returns:

Channel layout mask

Definition at line 89 of file audioconvert.c.

Referenced by avcodec_get_channel_layout_string().

void avcodec_sample_fmt_string	(	char *	buf,
		int	buf_size,
		int	sample_fmt
	)

Generate string corresponding to the sample format with number sample_fmt, or a header if sample_fmt is negative.

Parameters:

[in]	buf	the buffer where to write the string
[in]	buf_size	the size of buf
[in]	sample_fmt	the number of the sample format to print the corresponding info string, or a negative value to print the corresponding header. Meaningful values for obtaining a sample format info vary from 0 to SAMPLE_FMT_NB -1.

Definition at line 63 of file audioconvert.c.

Referenced by opt_audio_sample_fmt().