resample.c File Reference

audio resampling More...

#include "libavutil/avassert.h"
#include "resample.h"

Go to the source code of this file.

Functions
static double	bessel (double x)
	0th order modified bessel function of the first kind. More...
static int	build_filter (ResampleContext *c, void *filter, double factor, int tap_count, int alloc, int phase_count, int scale, int filter_type, int kaiser_beta)
	builds a polyphase filterbank. More...
static ResampleContext *	resample_init (ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff0, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby)
static void	resample_free (ResampleContext **c)
static int	set_compensation (ResampleContext *c, int sample_delta, int compensation_distance)
static int	swri_resample (ResampleContext *c, uint8_t *dst, const uint8_t *src, int *consumed, int src_size, int dst_size, int update_ctx)
static int	multiple_resample (ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed)
static int64_t	get_delay (struct SwrContext *s, int64_t base)
static int64_t	get_out_samples (struct SwrContext *s, int in_samples)
static int	resample_flush (struct SwrContext *s)
static int	invert_initial_buffer (ResampleContext *c, AudioData *dst, const AudioData *src, int in_count, int *out_idx, int *out_sz)

Variables
struct Resampler const	swri_resampler

Detailed Description

audio resampling

Author

Michael Niedermayer micha.nosp@m.elni.nosp@m.@gmx..nosp@m.at

Definition in file resample.c.

Function Documentation

static double bessel ( double  x )

static

0th order modified bessel function of the first kind.

Definition at line 34 of file resample.c.

Referenced by build_filter().

static int build_filter ( ResampleContext *  c, void *  filter, double  factor, int  tap_count, int  alloc, int  phase_count, int  scale, int  filter_type, int  kaiser_beta  )

static

builds a polyphase filterbank.

Parameters

factor	resampling factor
scale	wanted sum of coefficients for each filter
filter_type	filter type
kaiser_beta	kaiser window beta

Returns

0 on success, negative on error

Definition at line 70 of file resample.c.

Referenced by resample_init().

static ResampleContext* resample_init ( ResampleContext *  c, int  out_rate, int  in_rate, int  filter_size, int  phase_shift, int  linear, double  cutoff0, enum AVSampleFormat  format, enum SwrFilterType  filter_type, int  kaiser_beta, double  precision, int  cheby  )

static

Definition at line 174 of file resample.c.

static void resample_free ( ResampleContext **  c )

static

Definition at line 250 of file resample.c.

static int set_compensation ( ResampleContext *  c, int  sample_delta, int  compensation_distance  )

static

Definition at line 257 of file resample.c.

static int swri_resample ( ResampleContext *  c, uint8_t *  dst, const uint8_t *  src, int *  consumed, int  src_size, int  dst_size, int  update_ctx  )

static

Definition at line 270 of file resample.c.

Referenced by multiple_resample().

static int multiple_resample ( ResampleContext *  c, AudioData *  dst, int  dst_size, AudioData *  src, int  src_size, int *  consumed  )

static

Definition at line 308 of file resample.c.

static int64_t get_delay ( struct SwrContext *  s, int64_t  base  )

static

Definition at line 338 of file resample.c.

static int64_t get_out_samples ( struct SwrContext *  s, int  in_samples  )

static

Definition at line 348 of file resample.c.

static int resample_flush ( struct SwrContext *  s )

static

Definition at line 367 of file resample.c.

static int invert_initial_buffer ( ResampleContext *  c, AudioData *  dst, const AudioData *  src, int  in_count, int *  out_idx, int *  out_sz  )

static

Definition at line 384 of file resample.c.

Variable Documentation

struct Resampler const swri_resampler

Initial value:

={
  resample_init,
  resample_free,
  multiple_resample,
  resample_flush,
  set_compensation,
  get_delay,
  invert_initial_buffer,
  get_out_samples,
}

Definition at line 428 of file resample.c.

Referenced by swr_init().