Macros

#define  SWR_CH_MAX   32

  Maximum number of channels.

 

Functions

const AVClass *  swr_get_class (void)

  Get the AVClass for SwrContext.

 

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.

 

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.

 

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.

 

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.

 

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.

 

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_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...