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

Macros
#define	C30DB M_SQRT2

#define	C15DB 1.189207115

#define	C__0DB 1.0

#define	C_15DB 0.840896415

#define	C_30DB M_SQRT1_2

#define	C_45DB 0.594603558

#define	C_60DB 0.5

#define	ALIGN 32

#define	OFFSET(x) offsetof(SwrContext,x)

#define	PARAM AV_OPT_FLAG_AUDIO_PARAM

#define	LICENSE_PREFIX "libswresample license: "

#define	RSC 1

#define	MAX_DROP_STEP 16384

#define	MAX_SILENCE_STEP 16384

Functions
static const char *	context_to_name (void *ptr)

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.

const AVClass *	swr_get_class (void)
	Get the AVClass for swrContext.

av_cold struct SwrContext *	swr_alloc (void)
	Allocate SwrContext.

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 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.

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.

Variables
static const AVOption	options []

static const AVClass	av_class

Macro Definition Documentation

#define C30DB M_SQRT2

Definition at line 29 of file swresample.c.

#define C15DB 1.189207115

Definition at line 30 of file swresample.c.

#define C__0DB 1.0

Definition at line 31 of file swresample.c.

#define C_15DB 0.840896415

Definition at line 32 of file swresample.c.

#define C_30DB M_SQRT1_2

Definition at line 33 of file swresample.c.

#define C_45DB 0.594603558

Definition at line 34 of file swresample.c.

#define C_60DB 0.5

Definition at line 35 of file swresample.c.

#define ALIGN 32

Definition at line 37 of file swresample.c.

Referenced by swri_realloc_audio().

#define OFFSET ( x ) offsetof(SwrContext,x)

Definition at line 40 of file swresample.c.

#define PARAM AV_OPT_FLAG_AUDIO_PARAM

Definition at line 41 of file swresample.c.

#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 const char* context_to_name ( void * ptr )

static

Definition at line 135 of file swresample.c.

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

static

Definition at line 210 of file swresample.c.

Referenced by swr_init().

static void free_temp ( AudioData * a )

static

Definition at line 216 of file swresample.c.

Referenced by clear_context().

static void clear_context ( SwrContext * s )

static

Definition at line 221 of file swresample.c.

Referenced by swr_free(), and swr_init().

int swri_realloc_audio	(	AudioData *	a,
		int	count
	)

Definition at line 439 of file swresample.c.

Referenced by 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 471 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 484 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 497 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 511 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 526 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 609 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 740 of file swresample.c.

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

Variable Documentation

const AVOption options[]

static

Definition at line 43 of file swresample.c.

const AVClass av_class

static

Initial value:

= {
    .class_name                = "SWResampler",
    .item_name                 = context_to_name,
    .option                    = options,
    .version                   = LIBAVUTIL_VERSION_INT,
    .log_level_offset_offset   = OFFSET(log_level_offset),
    .parent_log_context_offset = OFFSET(log_ctx),
    .category                  = AV_CLASS_CATEGORY_SWRESAMPLER,
}

Definition at line 139 of file swresample.c.

Referenced by swr_alloc(), and swr_get_class().

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation