mpegaudioenc.c File Reference

#include "config.h"
#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "put_bits.h"
#include "mpegaudio.h"
#include "mpegaudiodsp.h"
#include "mpegaudiodata.h"
#include "mpegaudiotab.h"

Go to the source code of this file.

Data Structures
struct	MpegAudioContext

Macros
#define	FRAC_BITS   15 /* fractional bits for sb_samples and dct */
#define	WFRAC_BITS   14 /* fractional bits for window */
#define	MUL(a, b)   (((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)
#define	SAMPLES_BUF_SIZE   4096
#define	IS_FIXED(s)   (CONFIG_MP2_ENCODER && CONFIG_MP2FIXED_ENCODER ? (s)->is_fixed : CONFIG_MP2FIXED_ENCODER)
#define	P   15
#define	WSHIFT   (WFRAC_BITS + 15 - FRAC_BITS)
#define	SB_NOTALLOCATED   0
#define	SB_ALLOCATED   1
#define	SB_NOMORE   2

Functions
static av_cold int	mpa_encode_init (AVCodecContext *avctx)
static void	idct32 (int *out, int *tab)
static void	filter (MpegAudioContext *s, int ch, const short *samples, int incr)
static void	compute_scale_factors (MpegAudioContext *s, unsigned char scale_code[SBLIMIT], unsigned char scale_factors[SBLIMIT][3], int sb_samples[3][12][SBLIMIT], int sblimit)
static void	psycho_acoustic_model (MpegAudioContext *s, short smr[SBLIMIT])
static unsigned	compute_bit_allocation (MpegAudioContext *s, short smr1[MPA_MAX_CHANNELS][SBLIMIT], unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int *padding)
static av_always_inline void	encode_subbands (MpegAudioContext *const s, PutBitContext *const p, const uint8_t bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int is_fixed)
	Quantization & write sub band samples. More...
static void	encode_frame (MpegAudioContext *s, uint8_t *buf, unsigned buf_size, unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int padding)
static int	mpa_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

Variables
static const FFCodecDefault	mp2_defaults []

Detailed Description

The simplest mpeg audio layer 2 encoder.

Definition in file mpegaudioenc.c.

Macro Definition Documentation

FRAC_BITS

#define FRAC_BITS   15 /* fractional bits for sb_samples and dct */

Definition at line 38 of file mpegaudioenc.c.

WFRAC_BITS

#define WFRAC_BITS   14 /* fractional bits for window */

Definition at line 39 of file mpegaudioenc.c.

MUL

#define MUL	(		a,
			b
	)		(((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)

Definition at line 48 of file mpegaudioenc.c.

SAMPLES_BUF_SIZE

#define SAMPLES_BUF_SIZE   4096

Definition at line 50 of file mpegaudioenc.c.

IS_FIXED

#define IS_FIXED

(

s

)

(CONFIG_MP2_ENCODER && CONFIG_MP2FIXED_ENCODER ? (s)->is_fixed : CONFIG_MP2FIXED_ENCODER)

Definition at line 82 of file mpegaudioenc.c.

P

#define P   15

WSHIFT

#define WSHIFT   (WFRAC_BITS + 15 - FRAC_BITS)

Definition at line 322 of file mpegaudioenc.c.

SB_NOTALLOCATED

#define SB_NOTALLOCATED   0

Definition at line 503 of file mpegaudioenc.c.

SB_ALLOCATED

#define SB_ALLOCATED   1

Definition at line 504 of file mpegaudioenc.c.

SB_NOMORE

#define SB_NOMORE   2

Definition at line 505 of file mpegaudioenc.c.

Function Documentation

mpa_encode_init()

static av_cold int mpa_encode_init ( AVCodecContext *  avctx )

static

Definition at line 84 of file mpegaudioenc.c.

idct32()

static void idct32 ( int *  out, int *  tab  )

static

Definition at line 203 of file mpegaudioenc.c.

Referenced by filter().

filter()

static void filter ( MpegAudioContext *  s, int  ch, const short *  samples, int  incr  )

static

Definition at line 324 of file mpegaudioenc.c.

Referenced by mpa_encode_frame().

compute_scale_factors()

static void compute_scale_factors ( MpegAudioContext *  s, unsigned char  scale_code[SBLIMIT], unsigned char  scale_factors[SBLIMIT][3], int  sb_samples[3][12][SBLIMIT], int  sblimit  )

static

Definition at line 377 of file mpegaudioenc.c.

Referenced by mpa_encode_frame().

psycho_acoustic_model()

static void psycho_acoustic_model ( MpegAudioContext *  s, short  smr[SBLIMIT]  )

static

Definition at line 493 of file mpegaudioenc.c.

Referenced by mpa_encode_frame().

compute_bit_allocation()

static unsigned compute_bit_allocation ( MpegAudioContext *  s, short  smr1[MPA_MAX_CHANNELS][SBLIMIT], unsigned char  bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int *  padding  )

static

Definition at line 510 of file mpegaudioenc.c.

Referenced by mpa_encode_frame().

encode_subbands()

static av_always_inline void encode_subbands ( MpegAudioContext *const  s, PutBitContext *const  p, const uint8_t  bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int  is_fixed  )

static

Quantization & write sub band samples.

Definition at line 604 of file mpegaudioenc.c.

Referenced by encode_frame().

encode_frame()

static void encode_frame ( MpegAudioContext *  s, uint8_t *  buf, unsigned  buf_size, unsigned char  bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int  padding  )

static

Definition at line 671 of file mpegaudioenc.c.

Referenced by mpa_encode_frame().

mpa_encode_frame()

static int mpa_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 755 of file mpegaudioenc.c.

Variable Documentation

mp2_defaults

const FFCodecDefault mp2_defaults[]

static

Initial value:

= {
    { "b", "0" },
    { NULL },
}

Definition at line 790 of file mpegaudioenc.c.