FFmpeg: libavcodec/resample2.c File Reference

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libavcodec

Data Structures | Macros | Typedefs | Functions

resample2.c File Reference

audio resampling More...

#include "libavutil/avassert.h"
#include "avcodec.h"
#include "libavutil/common.h"

Go to the source code of this file.

Data Structures

struct AVResampleContext

Macros

#define FILTER_SHIFT 15

#define FELEM_MAX INT16_MAX

#define FELEM_MIN INT16_MIN

#define WINDOW_TYPE 9

Typedefs

typedef int16_t FELEM

typedef int32_t FELEM2

typedef int64_t FELEML

Functions

static double bessel (double x)

0th order modified bessel function of the first kind. More...

static int build_filter (FELEM *filter, double factor, int tap_count, int phase_count, int scale, int type)

Build a polyphase filterbank. More...

AVResampleContext * av_resample_init (int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff)

Initialize an audio resampler. More...

void av_resample_close (AVResampleContext *c)

void av_resample_compensate (AVResampleContext *c, int sample_delta, int compensation_distance)

Compensate samplerate/timestamp drift. More...

int av_resample (AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)

Resample an array of samples using a previously configured context. More...

Detailed Description

audio resampling

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

Definition in file resample2.c.

Macro Definition Documentation

#define FILTER_SHIFT 15

Definition at line 35 of file resample2.c.

Referenced by av_resample(), av_resample_init(), and build_filter().

#define FELEM_MAX INT16_MAX

Definition at line 40 of file resample2.c.

Referenced by build_filter().

#define FELEM_MIN INT16_MIN

Definition at line 41 of file resample2.c.

Referenced by build_filter().

#define WINDOW_TYPE 9

Definition at line 42 of file resample2.c.

Referenced by av_resample_init().

Typedef Documentation

typedef int16_t FELEM

Definition at line 37 of file resample2.c.

typedef int32_t FELEM2

Definition at line 38 of file resample2.c.

typedef int64_t FELEML

Definition at line 39 of file resample2.c.

Function Documentation

static double bessel ( double x )

static

0th order modified bessel function of the first kind.

Definition at line 80 of file resample2.c.

Referenced by build_filter(), and ff_kbd_window_init().

static int build_filter ( FELEM * filter,

double factor,

int tap_count,

int phase_count,

int scale,

int type

)

static

Build a polyphase filterbank.

Parameters: factor resampling factor

scale wanted sum of coefficients for each filter

type 0->cubic, 1->blackman nuttall windowed sinc, 2..16->kaiser windowed sinc beta=2..16

Returns: 0 on success, negative on error

Definition at line 102 of file resample2.c.

Referenced by av_resample_init().

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