libswresample/swresample.c File Reference

#include "libavutil/opt.h"
#include "swresample_internal.h"
#include "audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/audioconvert.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 OFFSET(x)   offsetof(SwrContext,x)

#define RSC   1

Functions

static const char * context_to_name (void *ptr)

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

Set a customized input channel mapping.

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 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 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)

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)

Convert audio.

Variables

static const AVOption options []

static const AVClass av_class

Define Documentation

#define C15DB 1.189207115

Definition at line 28 of file swresample.c.

#define C30DB M_SQRT2

Definition at line 27 of file swresample.c.

#define C_15DB 0.840896415

Definition at line 30 of file swresample.c.

#define C_30DB M_SQRT1_2

Definition at line 31 of file swresample.c.

#define C_45DB 0.594603558

Definition at line 32 of file swresample.c.

#define C_60DB 0.5

Definition at line 33 of file swresample.c.

#define C__0DB 1.0

Definition at line 29 of file swresample.c.

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

Definition at line 37 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 312 of file swresample.c.

Referenced by resample().

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

Definition at line 60 of file swresample.c.

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

Definition at line 284 of file swresample.c.

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

Definition at line 297 of file swresample.c.

Referenced by swr_convert().

static void free_temp ( AudioData * a ) [static]

Definition at line 113 of file swresample.c.

Referenced by swr_free(), and swr_init().

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

Definition at line 255 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 325 of file swresample.c.

Referenced by swr_convert().

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 80 of file swresample.c.

Referenced by 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 89 of file swresample.c.

Referenced by audio_decode_frame(), do_audio_out(), and main().

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

Convert audio.

in and in_count can be set to 0 to flush the last few samples out at the end.

Parameters:

	s	allocated Swr context, with parameters set
	out	output buffers, only the first one need be set in case of packed audio
	out_count	amount of space available for output in samples per channel
	in	input buffers, only the first one need to be set in case of packed audio
	in_count	number of input samples available in one channel

Returns:: number of samples output per channel

Definition at line 399 of file swresample.c.

Referenced by audio_decode_frame(), do_audio_out(), and main().

void swr_free ( SwrContext ** ss )

Free the given SwrContext and set the pointer to NULL.

Definition at line 118 of file swresample.c.

Referenced by audio_decode_frame(), do_audio_out(), stream_component_close(), and transcode().

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 134 of file swresample.c.

Referenced by audio_decode_frame(), do_audio_out(), and main().

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 73 of file swresample.c.

Referenced by do_audio_out().

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 64 of file swresample.c.

const AVOption options[] [static]

Initial value:

{
{"ich",  "input channel count", OFFSET( in.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
{"och", "output channel count", OFFSET(out.ch_count   ), AV_OPT_TYPE_INT, {.dbl=2}, 0, SWR_CH_MAX, 0},
{"uch",   "used channel count", OFFSET(used_ch_count  ), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_CH_MAX, 0},
{"isr",  "input sample rate"  , OFFSET( in_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},
{"osr", "output sample rate"  , OFFSET(out_sample_rate), AV_OPT_TYPE_INT, {.dbl=48000}, 1, INT_MAX, 0},


{"isf",  "input sample format", OFFSET( in_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
{"osf", "output sample format", OFFSET(out_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_S16}, 0, AV_SAMPLE_FMT_NB-1+256, 0},
{"tsf", "internal sample format", OFFSET(int_sample_fmt ), AV_OPT_TYPE_INT, {.dbl=AV_SAMPLE_FMT_NONE}, -1, AV_SAMPLE_FMT_FLT, 0},
{"icl",  "input channel layout" , OFFSET( in_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
{"ocl",  "output channel layout", OFFSET(out_ch_layout), AV_OPT_TYPE_INT64, {.dbl=0}, 0, INT64_MAX, 0, "channel_layout"},
{"clev", "center mix level"     , OFFSET(clev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
{"slev", "sourround mix level"  , OFFSET(slev)         , AV_OPT_TYPE_FLOAT, {.dbl=C_30DB}, 0, 4, 0},
{"rmvol", "rematrix volume"     , OFFSET(rematrix_volume), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, -1000, 1000, 0},
{"flags", NULL                  , OFFSET(flags)        , AV_OPT_TYPE_FLAGS, {.dbl=0}, 0,  UINT_MAX, 0, "flags"},
{"res", "force resampling", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"},

{0}
}

Definition at line 38 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	OFFSET(x) offsetof(SwrContext,x)
#define	RSC 1
Functions
static const char *	context_to_name (void *ptr)
int	swr_set_channel_mapping (struct SwrContext s, const int channel_map)
	Set a customized input channel mapping.
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	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	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)
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)
	Convert audio.
Variables
static const AVOption	options []
static const AVClass	av_class