resample.c File Reference

audio resampling More...

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

Go to the source code of this file.

Functions
static int	build_filter (ResampleContext *c, void *filter, double factor, int tap_count, int alloc, int phase_count, int scale, int filter_type, double kaiser_beta)
	builds a polyphase filterbank.
static void	resample_free (ResampleContext **cc)
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, double kaiser_beta, double precision, int cheby, int exact_rational)
static int	rebuild_filter_bank_with_compensation (ResampleContext *c)
static int	set_compensation (ResampleContext *c, int sample_delta, int compensation_distance)
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
const struct Resampler	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

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, double 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 41 of file resample.c.

Referenced by rebuild_filter_bank_with_compensation(), and resample_init().

resample_free()

static void resample_free ( ResampleContext ** cc )

static

Definition at line 176 of file resample.c.

Referenced by resample_init().

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, double kaiser_beta, double precision, int cheby, int exact_rational )

static

Definition at line 184 of file resample.c.

rebuild_filter_bank_with_compensation()

static int rebuild_filter_bank_with_compensation ( ResampleContext * c )

static

Definition at line 280 of file resample.c.

Referenced by set_compensation().

set_compensation()

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

static

Definition at line 328 of file resample.c.

multiple_resample()

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

static

Definition at line 349 of file resample.c.

get_delay()

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

static

Definition at line 408 of file resample.c.

get_out_samples()

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

static

Definition at line 418 of file resample.c.

resample_flush()

static int resample_flush ( struct SwrContext * s )

static

Definition at line 437 of file resample.c.

invert_initial_buffer()

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 457 of file resample.c.

Variable Documentation

swri_resampler

const struct Resampler swri_resampler

Initial value:

= {
    .init                  = resample_init,
    .free                  = resample_free,
    .multiple_resample     = multiple_resample,
    .flush                 = resample_flush,
    .set_compensation      = set_compensation,
    .get_delay             = get_delay,
    .invert_initial_buffer = invert_initial_buffer,
    .get_out_samples       = get_out_samples,
}

Definition at line 504 of file resample.c.

Referenced by swr_init().