audio_convert.h File Reference

#include "libavutil/samplefmt.h"
#include "avresample.h"
#include "internal.h"
#include "audio_data.h"

Go to the source code of this file.

Functions
void	ff_audio_convert_set_func (AudioConvert *ac, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int ptr_align, int samples_align, const char *descr, void *conv)
	Set conversion function if the parameters match.
AudioConvert *	ff_audio_convert_alloc (AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map)
	Allocate and initialize AudioConvert context for sample format conversion.
void	ff_audio_convert_free (AudioConvert **ac)
	Free AudioConvert.
int	ff_audio_convert (AudioConvert *ac, AudioData *out, AudioData *in)
	Convert audio data from one sample format to another.
void	ff_audio_convert_init_arm (AudioConvert *ac)
void	ff_audio_convert_init_x86 (AudioConvert *ac)

Function Documentation

void ff_audio_convert_set_func	(	AudioConvert *	ac,
		enum AVSampleFormat	out_fmt,
		enum AVSampleFormat	in_fmt,
		int	channels,
		int	ptr_align,
		int	samples_align,
		const char *	descr,
		void *	conv
	)

Set conversion function if the parameters match.

This compares the parameters of the conversion function to the parameters in the AudioConvert context. If the parameters do not match, no changes are made to the active functions. If the parameters do match and the alignment is not constrained, the function is set as the generic conversion function. If the parameters match and the alignment is constrained, the function is set as the optimized conversion function.

Parameters

ac	AudioConvert context
out_fmt	output sample format
in_fmt	input sample format
channels	number of channels, or 0 for any number of channels
ptr_align	buffer pointer alignment, in bytes
samples_align	buffer size alignment, in samples
descr	function type description (e.g. "C" or "SSE")
conv	conversion function pointer

Definition at line 70 of file audio_convert.c.

Referenced by ff_audio_convert_init_arm(), and ff_audio_convert_init_x86().

AudioConvert* ff_audio_convert_alloc	(	AVAudioResampleContext *	avr,
		enum AVSampleFormat	out_fmt,
		enum AVSampleFormat	in_fmt,
		int	channels,
		int	sample_rate,
		int	apply_map
	)

Allocate and initialize AudioConvert context for sample format conversion.

Parameters

avr	AVAudioResampleContext
out_fmt	output sample format
in_fmt	input sample format
channels	number of channels
sample_rate	sample rate (used for dithering)
apply_map	apply channel map during conversion

Returns

newly-allocated AudioConvert context

Referenced by avresample_open(), and ff_dither_alloc().

void ff_audio_convert_free

(

AudioConvert **

ac

)

Free AudioConvert.

The AudioConvert must have been previously allocated with ff_audio_convert_alloc().

Parameters

ac	AudioConvert struct

Referenced by avresample_close(), and ff_dither_free().

int ff_audio_convert	(	AudioConvert *	ac,
		AudioData *	out,
		AudioData *	in
	)

Convert audio data from one sample format to another.

For each call, the alignment of the input and output AudioData buffers are examined to determine whether to use the generic or optimized conversion function (when available).

The number of samples to convert is determined by in->nb_samples. The output buffer must be large enough to handle this many samples. out->nb_samples is set by this function before a successful return.

Parameters

ac	AudioConvert context
out	output audio data
in	input audio data

Returns

0 on success, negative AVERROR code on failure

Referenced by avresample_convert(), and ff_convert_dither().

void ff_audio_convert_init_arm

(

AudioConvert *

ac

)

Definition at line 34 of file audio_convert_init.c.

void ff_audio_convert_init_x86

(

AudioConvert *

ac

)

Definition at line 146 of file audio_convert_init.c.