FFmpeg: libavcodec/mpegaudio.h File Reference

FFmpeg

[フレーム]

libavcodec

Macros | Typedefs | Functions

mpegaudio.h File Reference

#include <stdint.h>
#include "libavutil/internal.h"

Go to the source code of this file.

Macros

#define USE_FLOATS 0

#define MPA_FRAME_SIZE 1152

#define MPA_MAX_CODED_FRAME_SIZE 1792

#define MPA_MAX_CHANNELS 2

#define SBLIMIT 32 /* number of subbands */

#define MPA_STEREO 0

#define MPA_JSTEREO 1

#define MPA_DUAL 2

#define MPA_MONO 3

#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */

#define WFRAC_BITS 16 /* fractional bits for window */

#define IMDCT_SCALAR 1.759

#define FRAC_ONE (1 << FRAC_BITS)

#define FIX(a) ((int)((a) * FRAC_ONE))

#define INTFLOAT int

#define SUINTFLOAT SUINT

Typedefs

typedef int32_t MPA_INT

typedef int16_t OUT_INT

Functions

int ff_mpa_l2_select_table (int bitrate, int nb_channels, int freq, int lsf)

Detailed Description

mpeg audio declarations for both encoder and decoder.

Definition in file mpegaudio.h.

Macro Definition Documentation

◆ USE_FLOATS

#define USE_FLOATS 0

Definition at line 30 of file mpegaudio.h.

◆ MPA_FRAME_SIZE

#define MPA_FRAME_SIZE 1152

Definition at line 37 of file mpegaudio.h.

◆ MPA_MAX_CODED_FRAME_SIZE

#define MPA_MAX_CODED_FRAME_SIZE 1792

Definition at line 40 of file mpegaudio.h.

◆ MPA_MAX_CHANNELS

#define MPA_MAX_CHANNELS 2

Definition at line 42 of file mpegaudio.h.

◆ SBLIMIT

#define SBLIMIT 32 /* number of subbands */

Definition at line 44 of file mpegaudio.h.

◆ MPA_STEREO

#define MPA_STEREO 0

Definition at line 46 of file mpegaudio.h.

◆ MPA_JSTEREO

#define MPA_JSTEREO 1

Definition at line 47 of file mpegaudio.h.

◆ MPA_DUAL

#define MPA_DUAL 2

Definition at line 48 of file mpegaudio.h.

◆ MPA_MONO

#define MPA_MONO 3

Definition at line 49 of file mpegaudio.h.

◆ FRAC_BITS

#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */

Definition at line 52 of file mpegaudio.h.

◆ WFRAC_BITS

#define WFRAC_BITS 16 /* fractional bits for window */

Definition at line 53 of file mpegaudio.h.

◆ IMDCT_SCALAR

#define IMDCT_SCALAR 1.759

Definition at line 56 of file mpegaudio.h.

◆ FRAC_ONE

#define FRAC_ONE (1 << FRAC_BITS)

Definition at line 58 of file mpegaudio.h.

◆ FIX

#define FIX ( a ) ((int)((a) * FRAC_ONE))

Definition at line 60 of file mpegaudio.h.

◆ INTFLOAT

#define INTFLOAT int

Definition at line 73 of file mpegaudio.h.

◆ SUINTFLOAT

#define SUINTFLOAT SUINT

Definition at line 74 of file mpegaudio.h.

Typedef Documentation

◆ MPA_INT

typedef int32_t MPA_INT

Definition at line 75 of file mpegaudio.h.

◆ OUT_INT

typedef int16_t OUT_INT

Definition at line 76 of file mpegaudio.h.

Function Documentation

◆ ff_mpa_l2_select_table()

int ff_mpa_l2_select_table ( int bitrate,

int nb_channels,

int freq,

int lsf

)

Definition at line 31 of file mpegaudio.c.

Referenced by mp_decode_layer2(), and MPA_encode_init().

Generated on Wed Aug 24 2022 21:38:41 for FFmpeg by doxygen 1.8.17