libavcodec/audioconvert.c File Reference

audio conversion More...

#include "libavutil/avstring.h"
#include "libavutil/libm.h"
#include "libavutil/samplefmt.h"
#include "avcodec.h"
#include "audioconvert.h"

Go to the source code of this file.

Data Structures
struct	AVAudioConvert
Defines
#define	CONV(ofmt, otype, ifmt, expr)
Functions
const char *	avcodec_get_sample_fmt_name (int sample_fmt)
enum AVSampleFormat	avcodec_get_sample_fmt (const char *name)
void	avcodec_sample_fmt_string (char *buf, int buf_size, int sample_fmt)
uint64_t	avcodec_guess_channel_layout (int nb_channels, enum CodecID codec_id, const char *fmt_name)
	Guess the channel layout.
int64_t	avcodec_get_channel_layout (const char *name)
void	avcodec_get_channel_layout_string (char *buf, int buf_size, int nb_channels, int64_t channel_layout)
int	avcodec_channel_layout_num_channels (int64_t channel_layout)
AVAudioConvert *	av_audio_convert_alloc (enum AVSampleFormat out_fmt, int out_channels, enum AVSampleFormat 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 conversion

Author:

Michael Niedermayer <michaelni@gmx.at>

Definition in file audioconvert.c.

---

Define Documentation

#define CONV	(	ofmt,
		otype,
		ifmt,
		expr		)

Value:

if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\
    do{\
        *(otype*)po = expr; pi += is; po += os;\
    }while(po < end);\
}

Referenced by av_audio_convert().

---

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 output samples (measured in bytes)
[in]	in	array of input buffers for each channel
[in]	in_stride	distance between consecutive input samples (measured in bytes)
	len	length of audio frame size (measured in samples)

Definition at line 108 of file audioconvert.c.

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

AVAudioConvert* av_audio_convert_alloc	(	enum AVSampleFormat	out_fmt,
		int	out_channels,
		enum AVSampleFormat	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 AV_CPU_FLAG_xx

Returns:

NULL on error

Definition at line 87 of file audioconvert.c.

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

void av_audio_convert_free

(

AVAudioConvert *

ctx

)

Free audio sample format converter context.

Definition at line 103 of file audioconvert.c.

Referenced by audio_resample_close(), av_audio_resample_init(), do_audio_out(), transcode(), and uninit().

int avcodec_channel_layout_num_channels

(

int64_t

channel_layout

)

Deprecated:

Use av_get_channel_layout_nb_channels() instead.

Definition at line 76 of file audioconvert.c.

int64_t avcodec_get_channel_layout

(

const char *

name

)

Deprecated:

Use av_get_channel_layout() instead.

Definition at line 66 of file audioconvert.c.

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

Deprecated:

Use av_get_channel_layout_string() instead.

Definition at line 71 of file audioconvert.c.

enum AVSampleFormat avcodec_get_sample_fmt

(

const char *

name

)

Deprecated:

Use av_get_sample_fmt() instead.

Definition at line 40 of file audioconvert.c.

const char* avcodec_get_sample_fmt_name

(

int

sample_fmt

)

Deprecated:

Use av_get_sample_fmt_name() instead.

Definition at line 35 of file audioconvert.c.

uint64_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 51 of file audioconvert.c.

Referenced by set_channel_info().

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

Deprecated:

Use av_get_sample_fmt_string() instead.

Definition at line 45 of file audioconvert.c.