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swresample.h File Reference
libswresample

libswresample public header More...

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

Go to the source code of this file.

## Typedefs

typedef struct SwrContext | SwrContext
| The libswresample context.

## 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.
int | swr_alloc_set_opts2 (struct SwrContext **ps, const AVChannelLayout *out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, const AVChannelLayout *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 *const *out, int out_count, const uint8_t *const *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 functions 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_build_matrix2 (const AVChannelLayout *in_layout, const AVChannelLayout *out_layout, double center_mix_level, double surround_mix_level, double lfe_mix_level, double maxval, double rematrix_volume, double *matrix, ptrdiff_t stride, enum AVMatrixEncoding matrix_encoding, void *log_context)
| Generate a channel mixing matrix.
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.
int | swr_get_out_samples (struct SwrContext *s, int in_samples)
| Find an upper bound on the number of samples that the next swr_convert call will output, if called with in_samples of input samples.
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.