mpegaudioenc.c File Reference

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

#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)
#define	SAMPLES_BUF_SIZE   4096
#define	IS_FIXED(s)
#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.
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 )

Value:

(((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)

Definition at line 48 of file mpegaudioenc.c.

Referenced by idct32().

SAMPLES_BUF_SIZE

#define SAMPLES_BUF_SIZE   4096

Definition at line 50 of file mpegaudioenc.c.

Referenced by filter().

IS_FIXED

#define IS_FIXED

(

s

)

Value:

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

Definition at line 82 of file mpegaudioenc.c.

Referenced by encode_frame(), and mpa_encode_init().

P

#define P   15

Referenced by color_graticule(), color_graticule16(), compute_band_corr(), compute_frame_features(), direct_search(), encode_q_branch(), encode_subbands(), epzs_motion_search2(), epzs_motion_search_internal(), estimate_motion_b(), ff_epzs_motion_search(), ff_estimate_p_frame_motion(), ff_linear_int_to_srgb_u8(), ff_me_init(), ff_pre_estimate_p_frame_motion(), ff_videotoolbox_hvcc_extradata_create(), filter_channel(), filter_channel(), filter_color(), filter_color2(), filter_frame(), filter_mono(), frame_header(), generate_slice(), get_cap(), green_graticule(), green_graticule16(), h263_mv4_search(), interlaced_search(), invert_graticule(), invert_graticule16(), 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(), lup_decompose(), lup_invert(), mpa_encode_init(), none_graticule(), pitch_filter(), rnnoise_channel(), twofish_decrypt(), twofish_encrypt(), and update_hue_peaks().

WSHIFT

#define WSHIFT   (WFRAC_BITS + 15 - FRAC_BITS)

Definition at line 322 of file mpegaudioenc.c.

Referenced by filter().

SB_NOTALLOCATED

#define SB_NOTALLOCATED   0

Definition at line 503 of file mpegaudioenc.c.

Referenced by compute_bit_allocation().

SB_ALLOCATED

#define SB_ALLOCATED   1

Definition at line 504 of file mpegaudioenc.c.

Referenced by compute_bit_allocation().

SB_NOMORE

#define SB_NOMORE   2

Definition at line 505 of file mpegaudioenc.c.

Referenced by compute_bit_allocation().

Function Documentation

mpa_encode_init()

av_cold int mpa_encode_init ( AVCodecContext * avctx )

static

Definition at line 84 of file mpegaudioenc.c.

idct32()

void idct32 ( int * out, int * tab )

static

Definition at line 203 of file mpegaudioenc.c.

Referenced by filter().

filter()

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

static

Definition at line 324 of file mpegaudioenc.c.

compute_scale_factors()

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()

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()

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()

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()

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()

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.