audioconvert.h File Reference

Audio format conversion routines. More...

#include "libavutil/cpu.h"
#include "avcodec.h"
#include "libavutil/audioconvert.h"

Go to the source code of this file.

Typedefs
typedef struct AVAudioConvert	AVAudioConvert

Functions
uint64_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 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 format conversion routines.

Definition in file audioconvert.h.

Typedef Documentation

typedef struct AVAudioConvert AVAudioConvert

Definition at line 86 of file audioconvert.h.

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_decode_frame(), audio_resample(), and do_audio_out().

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 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 103 of file audioconvert.c.

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

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().