Functions

const AVClass *  swr_get_class (void)

  Get the AVClass for SwrContext. More...

 

struct SwrContext *  swr_alloc (void)

  Allocate SwrContext. More...

 

int  swr_init (struct SwrContext *s)

  Initialize context after user parameters have been set. More...

 

int  swr_is_initialized (struct SwrContext *s)

  Check whether an swr context has been initialized or not. More...

 

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. More...

 

void  swr_free (struct SwrContext **s)

  Free the given SwrContext and set the pointer to NULL. More...

 

void  swr_close (struct SwrContext *s)

  Closes the context so that swr_is_initialized() returns 0. More...

 

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

  Convert audio. More...

 

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. More...

 

int  swr_set_compensation (struct SwrContext *s, int sample_delta, int compensation_distance)

  Activate resampling compensation ("soft" compensation). More...

 

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

  Set a customized input channel mapping. More...

 

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. More...

 

int  swr_set_matrix (struct SwrContext *s, const double *matrix, int stride)

  Set a customized remix matrix. More...

 

int  swr_drop_output (struct SwrContext *s, int count)

  Drops the specified number of output samples. More...

 

int  swr_inject_silence (struct SwrContext *s, int count)

  Injects the specified number of silence samples. More...

 

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. More...

 

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. More...

 

unsigned  swresample_version (void)

  Return the LIBSWRESAMPLE_VERSION_INT constant. More...

 

const char *  swresample_configuration (void)

  Return the swr build-time configuration. More...

 

const char *  swresample_license (void)

  Return the swr license. More...

 

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. More...

 

int  swr_config_frame (SwrContext *swr, const AVFrame *out, const AVFrame *in)

  Configure or reconfigure the SwrContext using the information provided by the AVFrames. More...

 

Option constants

These constants are used for the AVOptions interface for lswr.

#define  SWR_FLAG_RESAMPLE   1

  Force resampling even if equal sample rate. More...

 

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...