swresample.c File Reference

#include "libavutil/opt.h"
#include "swresample_internal.h"
#include "audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include <float.h>

Go to the source code of this file.

Macros
#define	ALIGN   32
#define	LICENSE_PREFIX   "libswresample license: "
#define	RSC   1
#define	MAX_DROP_STEP   16384
#define	MAX_SILENCE_STEP   16384

Functions
unsigned	swresample_version (void)
	Return the LIBSWRESAMPLE_VERSION_INT constant.
const char *	swresample_configuration (void)
	Return the swr build-time configuration.
const char *	swresample_license (void)
	Return the swr license.
int	swr_set_channel_mapping (struct SwrContext *s, const int *channel_map)
	Set a customized input channel mapping.
struct SwrContext *	swr_alloc_set_opts (struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx)
	Allocate SwrContext if needed and set/reset common parameters.
static void	set_audiodata_fmt (AudioData *a, enum AVSampleFormat fmt)
static void	free_temp (AudioData *a)
static void	clear_context (SwrContext *s)
av_cold void	swr_free (SwrContext **ss)
	Free the given SwrContext and set the pointer to NULL.
av_cold void	swr_close (SwrContext *s)
	Closes the context so that swr_is_initialized() returns 0.
av_cold int	swr_init (struct SwrContext *s)
	Initialize context after user parameters have been set.
int	swri_realloc_audio (AudioData *a, int count)
static void	copy (AudioData *out, AudioData *in, int count)
static void	fill_audiodata (AudioData *out, uint8_t *in_arg[SWR_CH_MAX])
static void	reversefill_audiodata (AudioData *out, uint8_t *in_arg[SWR_CH_MAX])
static void	buf_set (AudioData *out, AudioData *in, int count)
	out may be equal in.
static int	resample (SwrContext *s, AudioData *out_param, int out_count, const AudioData *in_param, int in_count)
static int	swr_convert_internal (struct SwrContext *s, AudioData *out, int out_count, AudioData *in, int in_count)
int	swr_is_initialized (struct SwrContext *s)
	Check whether an swr context has been initialized or not.
int	swr_convert (struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count, const uint8_t *in_arg[SWR_CH_MAX], int in_count)
int	swr_drop_output (struct SwrContext *s, int count)
	Drops the specified number of output samples.
int	swr_inject_silence (struct SwrContext *s, int count)
	Injects the specified number of silence samples.
int64_t	swr_get_delay (struct SwrContext *s, int64_t base)
	Gets the delay the next input sample will experience relative to the next output sample.
int	swr_set_compensation (struct SwrContext *s, int sample_delta, int compensation_distance)
	Activate resampling compensation ("soft" compensation).
int64_t	swr_next_pts (struct SwrContext *s, int64_t pts)
	Convert the next timestamp from input to output timestamps are in 1/(in_sample_rate * out_sample_rate) units.

Macro Definition Documentation

#define ALIGN   32

Definition at line 29 of file swresample.c.

Referenced by swri_realloc_audio().

#define LICENSE_PREFIX   "libswresample license: "

#define RSC   1

Referenced by swr_init().

#define MAX_DROP_STEP   16384

Referenced by swr_convert().

#define MAX_SILENCE_STEP   16384

Referenced by swr_inject_silence().

Function Documentation

static void set_audiodata_fmt ( AudioData *  a, enum AVSampleFormat  fmt  )

static

Definition at line 78 of file swresample.c.

Referenced by swr_init().

static void free_temp ( AudioData *  a )

static

Definition at line 84 of file swresample.c.

Referenced by clear_context().

static void clear_context ( SwrContext *  s )

static

Definition at line 89 of file swresample.c.

Referenced by swr_close(), swr_free(), and swr_init().

int swri_realloc_audio	(	AudioData *	a,
		int	count
	)

Definition at line 311 of file swresample.c.

Referenced by invert_initial_buffer(), resample(), resample_flush(), swr_convert(), swr_convert_internal(), and swr_inject_silence().

static void copy ( AudioData *  out, AudioData *  in, int  count  )

static

Definition at line 343 of file swresample.c.

Referenced by resample(), swr_convert(), and swr_convert_internal().

static void fill_audiodata ( AudioData *  out, uint8_t *  in_arg[SWR_CH_MAX]  )

static

Definition at line 356 of file swresample.c.

Referenced by swr_convert().

static void reversefill_audiodata ( AudioData *  out, uint8_t *  in_arg[SWR_CH_MAX]  )

static

Definition at line 369 of file swresample.c.

Referenced by swr_convert(), and swr_inject_silence().

static void buf_set ( AudioData *  out, AudioData *  in, int  count  )

static

out may be equal in.

Definition at line 383 of file swresample.c.

Referenced by resample(), and swr_convert().

static int resample ( SwrContext *  s, AudioData *  out_param, int  out_count, const AudioData *  in_param, int  in_count  )

static

Returns

number of samples output per channel

Definition at line 398 of file swresample.c.

Referenced by swr_convert_internal().

static int swr_convert_internal ( struct SwrContext *  s, AudioData *  out, int  out_count, AudioData *  in, int  in_count  )

static

Definition at line 487 of file swresample.c.

Referenced by swr_convert().

int swr_convert	(	struct SwrContext *	s,
		uint8_t *	out_arg[SWR_CH_MAX],
		int	out_count,
		const uint8_t *	in_arg[SWR_CH_MAX],
		int	in_count
	)

Examples:

muxing.c, resampling_audio.c, and transcode_aac.c.

Definition at line 618 of file swresample.c.

Referenced by audio_decode_frame(), convert_samples(), filter_frame(), main(), opus_decode_frame(), opus_flush_resample(), opus_init_resample(), request_frame(), swr_drop_output(), swr_inject_silence(), wrap(), and write_audio_frame().