swresample.h File Reference

libswresample public header More...

#include <stdint.h>
#include "libavutil/frame.h"
#include "libavutil/samplefmt.h"
#include "libswresample/version.h"

Go to the source code of this file.

Macros
#define	SWR_CH_MAX   32
	Maximum number of channels.

Functions
const AVClass *	swr_get_class (void)
	Get the AVClass for SwrContext.
SwrContext constructor functions
struct SwrContext *	swr_alloc (void)
	Allocate SwrContext.
int	swr_init (struct SwrContext *s)
	Initialize context after user parameters have been set.
int	swr_is_initialized (struct SwrContext *s)
	Check whether an swr context has been initialized or not.
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.
SwrContext destructor functions
void	swr_free (struct SwrContext **s)
	Free the given SwrContext and set the pointer to NULL.
void	swr_close (struct SwrContext *s)
	Closes the context so that swr_is_initialized() returns 0.
Core conversion functions
int	swr_convert (struct SwrContext *s, uint8_t **out, int out_count, const uint8_t **in, int in_count)
	Convert audio.
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.
Low-level option setting functions
These functons provide a means to set low-level options that is not possible with the AVOption API.
int	swr_set_compensation (struct SwrContext *s, int sample_delta, int compensation_distance)
	Activate resampling compensation ("soft" compensation).
int	swr_set_channel_mapping (struct SwrContext *s, const int *channel_map)
	Set a customized input channel mapping.
int	swr_set_matrix (struct SwrContext *s, const double *matrix, int stride)
	Set a customized remix matrix.
Sample handling functions
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.
Configuration accessors
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.
AVFrame based API
int	swr_convert_frame (SwrContext *swr, AVFrame *output, const AVFrame *input)
	Convert the samples in the input AVFrame and write them to the output AVFrame.
int	swr_config_frame (SwrContext *swr, const AVFrame *out, const AVFrame *in)
	Configure or reconfigure the SwrContext using the information provided by the AVFrames.

Option constants
These constants are used for the AVOptions interface for lswr.
#define	SWR_FLAG_RESAMPLE   1
	Force resampling even if equal sample rate.
enum	SwrDitherType {   SWR_DITHER_NONE = 0, SWR_DITHER_RECTANGULAR, SWR_DITHER_TRIANGULAR, SWR_DITHER_TRIANGULAR_HIGHPASS,   SWR_DITHER_NS = 64, SWR_DITHER_NS_LIPSHITZ, SWR_DITHER_NS_F_WEIGHTED, SWR_DITHER_NS_MODIFIED_E_WEIGHTED,   SWR_DITHER_NS_IMPROVED_E_WEIGHTED, SWR_DITHER_NS_SHIBATA, SWR_DITHER_NS_LOW_SHIBATA, SWR_DITHER_NS_HIGH_SHIBATA,   SWR_DITHER_NB }
	Dithering algorithms. More...
enum	SwrEngine { SWR_ENGINE_SWR, SWR_ENGINE_SOXR, SWR_ENGINE_NB }
	Resampling Engines. More...
enum	SwrFilterType { SWR_FILTER_TYPE_CUBIC, SWR_FILTER_TYPE_BLACKMAN_NUTTALL, SWR_FILTER_TYPE_KAISER }
	Resampling Filter Types. More...

Detailed Description

libswresample public header

Definition in file swresample.h.