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
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 60 of file audioconvert.c.

Referenced by audio_resample().

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 39 of file audioconvert.c.

Referenced by av_audio_resample_init().

void av_audio_convert_free

(

AVAudioConvert *

ctx

)

Free audio sample format converter context.

Definition at line 55 of file audioconvert.c.

Referenced by audio_resample_close(), and av_audio_resample_init().