resample.c File Reference

samplerate conversion for both audio and video More...

#include <string.h>
#include "avcodec.h"
#include "audioconvert.h"
#include "libavutil/opt.h"
#include "libavutil/mem.h"
#include "libavutil/samplefmt.h"

Go to the source code of this file.

Data Structures
struct	ReSampleContext

Macros
#define	MAX_CHANNELS   8
#define	SUPPORT_RESAMPLE(ch1, ch2, ch3, ch4, ch5, ch6, ch7, ch8)   ch8<<7 | ch7<<6 | ch6<<5 | ch5<<4 | ch4<<3 | ch3<<2 | ch2<<1 | ch1<<0

Functions
static const char *	context_to_name (void *ptr)
static void	stereo_to_mono (short *output, short *input, int n1)
static void	mono_to_stereo (short *output, short *input, int n1)
static void	surround_to_stereo (short **output, short *input, int channels, int samples)
static void	deinterleave (short **output, short *input, int channels, int samples)
static void	interleave (short *output, short **input, int channels, int samples)
static void	ac3_5p1_mux (short *output, short *input1, short *input2, int n)
ReSampleContext *	av_audio_resample_init (int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)
	Initialize audio resampling context.
int	audio_resample (ReSampleContext *s, short *output, short *input, int nb_samples)
void	audio_resample_close (ReSampleContext *s)
	Free resample context.

Variables
static const AVOption	options [] = {{NULL}}
static const AVClass	audioresample_context_class
static const uint8_t	supported_resampling [MAX_CHANNELS]

Detailed Description

samplerate conversion for both audio and video

Definition in file resample.c.

Macro Definition Documentation

#define MAX_CHANNELS   8

Definition at line 37 of file resample.c.

Referenced by audio_resample(), and av_audio_resample_init().

#define SUPPORT_RESAMPLE	(		ch1,
			ch2,
			ch3,
			ch4,
			ch5,
			ch6,
			ch7,
			ch8
	)		ch8<<7 | ch7<<6 | ch6<<5 | ch5<<4 | ch4<<3 | ch3<<2 | ch2<<1 | ch1<<0

Definition at line 188 of file resample.c.

Function Documentation

static const char* context_to_name ( void *  ptr )

static

Definition at line 41 of file resample.c.

static void stereo_to_mono ( short *  output, short *  input, int  n1  )

static

Definition at line 66 of file resample.c.

Referenced by audio_resample().

static void mono_to_stereo ( short *  output, short *  input, int  n1  )

static

Definition at line 91 of file resample.c.

Referenced by audio_resample().

static void surround_to_stereo ( short **  output, short *  input, int  channels, int  samples  )

static

Definition at line 123 of file resample.c.

Referenced by audio_resample().

static void deinterleave ( short **  output, short *  input, int  channels, int  samples  )

static

Definition at line 149 of file resample.c.

Referenced by audio_resample().

static void interleave ( short *  output, short **  input, int  channels, int  samples  )

static

Definition at line 160 of file resample.c.

Referenced by audio_resample().

static void ac3_5p1_mux ( short *  output, short *  input1, short *  input2, int  n  )

static

Definition at line 171 of file resample.c.

Referenced by audio_resample().

Variable Documentation

const AVOption options[] = {{NULL}}

static

Definition at line 46 of file resample.c.

const AVClass audioresample_context_class

static

Initial value:

= {
    "ReSampleContext", context_to_name, options, LIBAVUTIL_VERSION_INT
}

Definition at line 47 of file resample.c.

const uint8_t supported_resampling[MAX_CHANNELS]

static

Initial value:

= {
    
    SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 0, 0, 0), 
    SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 1, 0, 0), 
    SUPPORT_RESAMPLE(0, 0, 1, 0, 0, 0, 0, 0), 
    SUPPORT_RESAMPLE(0, 0, 0, 1, 0, 0, 0, 0), 
    SUPPORT_RESAMPLE(0, 0, 0, 0, 1, 0, 0, 0), 
    SUPPORT_RESAMPLE(0, 1, 0, 0, 0, 1, 0, 0), 
    SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 1, 0), 
    SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 0, 1), 
}

Definition at line 191 of file resample.c.

Referenced by av_audio_resample_init().