mpegaudioenc_template.c File Reference

The simplest mpeg audio layer 2 encoder. More...

#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "internal.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	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 void	compute_bit_allocation (MpegAudioContext *s, short smr1[MPA_MAX_CHANNELS][SBLIMIT], unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT], int *padding)
static void	encode_frame (MpegAudioContext *s, 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 AVCodecDefault	mp2_defaults []

Detailed Description

The simplest mpeg audio layer 2 encoder.

Definition in file mpegaudioenc_template.c.

Macro Definition Documentation

FRAC_BITS

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

Definition at line 33 of file mpegaudioenc_template.c.

WFRAC_BITS

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

Definition at line 34 of file mpegaudioenc_template.c.

Referenced by MPA_encode_init().

MUL

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

Definition at line 43 of file mpegaudioenc_template.c.

Referenced by idct32().

SAMPLES_BUF_SIZE

#define SAMPLES_BUF_SIZE   4096

Definition at line 45 of file mpegaudioenc_template.c.

Referenced by filter().

P

#define P   15

Referenced by color_graticule(), color_graticule16(), direct_search(), encode_frame(), encode_q_branch(), estimate_motion_b(), ff_estimate_p_frame_motion(), ff_h263_round_chroma(), ff_pre_estimate_p_frame_motion(), filter_color(), filter_color2(), filter_frame(), filter_mono(), green_graticule(), green_graticule16(), h263_mv4_search(), interlaced_search(), ipvideo_decode_block_opcode_0x7(), ipvideo_decode_block_opcode_0x7_16(), ipvideo_decode_block_opcode_0x8(), ipvideo_decode_block_opcode_0x8_16(), ipvideo_decode_block_opcode_0x9(), ipvideo_decode_block_opcode_0x9_16(), ipvideo_decode_block_opcode_0xA(), ipvideo_decode_block_opcode_0xA_16(), ipvideo_decode_block_opcode_0xD(), ipvideo_decode_block_opcode_0xD_16(), MPA_encode_init(), query_formats(), twofish_decrypt(), and twofish_encrypt().

WSHIFT

#define WSHIFT   (WFRAC_BITS + 15 - FRAC_BITS)

Definition at line 321 of file mpegaudioenc_template.c.

Referenced by filter().

SB_NOTALLOCATED

#define SB_NOTALLOCATED   0

Definition at line 502 of file mpegaudioenc_template.c.

Referenced by compute_bit_allocation().

SB_ALLOCATED

#define SB_ALLOCATED   1

Definition at line 503 of file mpegaudioenc_template.c.

Referenced by compute_bit_allocation().

SB_NOMORE

#define SB_NOMORE   2

Definition at line 504 of file mpegaudioenc_template.c.

Referenced by compute_bit_allocation().

Function Documentation

MPA_encode_init()

static av_cold int MPA_encode_init ( AVCodecContext *  avctx )

static

Definition at line 76 of file mpegaudioenc_template.c.

idct32()

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

static

Definition at line 202 of file mpegaudioenc_template.c.

Referenced by filter().

filter()

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

static

Definition at line 323 of file mpegaudioenc_template.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 376 of file mpegaudioenc_template.c.

Referenced by MPA_encode_frame().

psycho_acoustic_model()

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

static

Definition at line 492 of file mpegaudioenc_template.c.

Referenced by MPA_encode_frame().

compute_bit_allocation()

static void 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 509 of file mpegaudioenc_template.c.

Referenced by MPA_encode_frame().

encode_frame()

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

static

Definition at line 605 of file mpegaudioenc_template.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 744 of file mpegaudioenc_template.c.

Variable Documentation

mp2_defaults

const AVCodecDefault mp2_defaults[]

static

Initial value:

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

Definition at line 781 of file mpegaudioenc_template.c.