libswresample/swresample.c File Reference

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

Go to the source code of this file.

Defines

#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

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.

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)

void swr_free (SwrContext **ss)

Free the given SwrContext and set the pointer to NULL.

int swr_init (struct SwrContext *s)

Initialize context after user parameters have been set.

static int 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_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_next_pts (struct SwrContext *s, int64_t pts)

Convert the next timestamp from input to output timestampe are in 1/(in_sample_rate * out_sample_rate) units.

Variables

static const AVOption options []

static const AVClass av_class

Define Documentation

#define ALIGN 32

Definition at line 37 of file swresample.c.

#define C15DB 1.189207115

Definition at line 30 of file swresample.c.

#define C30DB M_SQRT2

Definition at line 29 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 C__0DB 1.0

Definition at line 31 of file swresample.c.

#define LICENSE_PREFIX "libswresample license: "

#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 RSC 1

Referenced by swr_init().

Function Documentation

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

out may be equal in.

Definition at line 415 of file swresample.c.

Referenced by resample(), and swr_convert().

static const char* context_to_name ( void * ptr ) [static]

Definition at line 95 of file swresample.c.

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

Definition at line 375 of file swresample.c.

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

Definition at line 388 of file swresample.c.

Referenced by swr_convert().

static void free_temp ( AudioData * a ) [static]

Definition at line 175 of file swresample.c.

Referenced by swr_free(), and swr_init().

static int realloc_audio	(	AudioData *	a,
		int	count
	)			`[static]`

Definition at line 343 of file swresample.c.

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

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 430 of file swresample.c.

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

Definition at line 401 of file swresample.c.

Referenced by swr_convert(), and swr_inject_silence().

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

Definition at line 169 of file swresample.c.

Referenced by swr_init().

struct SwrContext* swr_alloc ( void ) [read]

Allocate SwrContext.

If you use this function you will need to set the parameters (manually or with swr_alloc_set_opts()) before calling swr_init().

See also:: swr_alloc_set_opts(), swr_init(), swr_free()

Returns:: NULL on error, allocated context otherwise

Definition at line 137 of file swresample.c.

Referenced by init(), init_opts(), and swr_alloc_set_opts().

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
	)			`[read]`

Allocate SwrContext if needed and set/reset common parameters.

This function does not require s to be allocated with swr_alloc(). On the other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters on the allocated context.

Parameters:

	s	Swr context, can be NULL
	out_ch_layout	output channel layout (AV_CH_LAYOUT_*)
	out_sample_fmt	output sample format (AV_SAMPLE_FMT_*).
	out_sample_rate	output sample rate (frequency in Hz)
	in_ch_layout	input channel layout (AV_CH_LAYOUT_*)
	in_sample_fmt	input sample format (AV_SAMPLE_FMT_*).
	in_sample_rate	input sample rate (frequency in Hz)
	log_offset	logging level offset
	log_ctx	parent logging context, can be NULL

See also:: swr_init(), swr_free()

Returns:: NULL on error, allocated context otherwise

Definition at line 146 of file swresample.c.

Referenced by audio_decode_frame(), config_output(), config_props(), and main().

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
	)

Definition at line 608 of file swresample.c.

Referenced by audio_decode_frame(), filter_samples(), main(), request_frame(), swr_drop_output(), and swr_inject_silence().

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

Definition at line 508 of file swresample.c.

Referenced by swr_convert().

int swr_drop_output	(	struct SwrContext *	s,
		int	count
	)

Drops the specified number of output samples.

Definition at line 720 of file swresample.c.

Referenced by swr_next_pts().

void swr_free ( SwrContext ** ss )

Free the given SwrContext and set the pointer to NULL.

Definition at line 180 of file swresample.c.

Referenced by audio_decode_frame(), stream_component_close(), uninit(), and uninit_opts().

const AVClass* swr_get_class ( void )

Get the AVClass for swrContext.

It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.

See also:: av_opt_find().

Definition at line 132 of file swresample.c.

Referenced by opt_default().

int swr_init ( struct SwrContext * s )

Initialize context after user parameters have been set.

Returns:: AVERROR error code in case of failure.

Definition at line 198 of file swresample.c.

Referenced by audio_decode_frame(), config_output(), config_props(), main(), and swr_set_compensation().

int swr_inject_silence	(	struct SwrContext *	s,
		int	count
	)

Injects the specified number of silence samples.

Definition at line 730 of file swresample.c.

Referenced by swr_next_pts().

int64_t swr_next_pts	(	struct SwrContext *	s,
		int64_t	pts
	)

Convert the next timestamp from input to output timestampe are in 1/(in_sample_rate * out_sample_rate) units.

Note:: There are 2 slightly differently behaving modes. First is when automatic timestamp compensation is not used, (min_compensation >= FLT_MAX) in this case timestamps will be passed through with delays compensated Second is when automatic timestamp compensation is used, (min_compensation < FLT_MAX) in this case the output timestamps will match output sample numbers

Parameters:

pts

timstamp for the next input sample, INT64_MIN if unknown

Returns:: the output timestamp for the next output sample

Definition at line 755 of file swresample.c.

Referenced by filter_samples(), and request_frame().

int swr_set_channel_mapping	(	struct SwrContext *	s,
		const int *	channel_map
	)

Set a customized input channel mapping.

Parameters:

	s	allocated Swr context, not yet initialized
	channel_map	customized input channel mapping (array of channel indexes, -1 for a muted channel)

Returns:: AVERROR error code in case of failure.

Definition at line 125 of file swresample.c.

Referenced by config_props().

const char* swresample_configuration ( void )

Return the swr build-time configuration.

Definition at line 114 of file swresample.c.

const char* swresample_license ( void )

Return the swr license.

Definition at line 119 of file swresample.c.

unsigned swresample_version ( void )

Return the LIBSWRESAMPLE_VERSION_INT constant.

Definition at line 108 of file swresample.c.

Variable Documentation

const AVClass av_class [static]

Initial value:

 {
    .class_name                = "SwrContext",
    .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),
}

Definition at line 99 of file swresample.c.

const AVOption options[] [static]

Definition at line 43 of file swresample.c.


Defines
#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
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.
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)
void	swr_free (SwrContext **ss)
	Free the given SwrContext and set the pointer to NULL.
int	swr_init (struct SwrContext *s)
	Initialize context after user parameters have been set.
static int	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_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_next_pts (struct SwrContext *s, int64_t pts)
	Convert the next timestamp from input to output timestampe are in 1/(in_sample_rate * out_sample_rate) units.
Variables
static const AVOption	options []
static const AVClass	av_class