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Data Structures | Macros | Functions | Variables
mpegaudiodec_template.c File Reference

MPEG Audio decoder. More...

#include <math.h>
#include "config_components.h"
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "decode.h"
#include "get_bits.h"
#include "mathops.h"
#include "mpegaudiodsp.h"
#include "mpegaudio.h"
#include "mpegaudiodecheader.h"
#include "mpegaudiodata.h"
#include "mpegaudio_tablegen.h"

Go to the source code of this file.

Data Structures

struct  GranuleDef
struct  MPADecodeContext

Macros

#define BACKSTEP_SIZE   512
#define EXTRABYTES   24
#define LAST_BUF_SIZE   2 * BACKSTEP_SIZE + EXTRABYTES
#define HEADER_SIZE   4
#define SCALE_GEN(v)
#define C3   FIXHR(0.86602540378443864676/2)
#define C4   FIXHR(0.70710678118654752439/2)
#define C5   FIXHR(0.51763809020504152469/2)
#define C6   FIXHR(1.93185165257813657349/4)
#define SPLIT(dst, sf, n)
#define READ_FLIP_SIGN(dst, src)
#define ISQRT2   FIXR(0.70710678118654752440)
#define AA(j)

Functions

static void region_offset2size (GranuleDef *g)
 Convert region offsets to region sizes and truncate size to big_values.
static void init_short_region (MPADecodeContext *s, GranuleDef *g)
static void init_long_region (MPADecodeContext *s, GranuleDef *g, int ra1, int ra2)
static void compute_band_indexes (MPADecodeContext *s, GranuleDef *g)
static int l1_unscale (int n, int mant, int scale_factor)
static int l2_unscale_group (int steps, int mant, int scale_factor)
static int l3_unscale (int value, int exponent)
static av_cold void decode_init_static (void)
static av_cold int decode_ctx_init (AVCodecContext *avctx, MPADecodeContext *s)
static av_cold int decode_init (AVCodecContext *avctx)
static void imdct12 (INTFLOAT *out, SUINTFLOAT *in)
static int handle_crc (MPADecodeContext *s, int sec_len)
static int mp_decode_layer1 (MPADecodeContext *s)
static int mp_decode_layer2 (MPADecodeContext *s)
static av_always_inline void lsf_sf_expand (int *slen, int sf, int n1, int n2, int n3)
static void exponents_from_scale_factors (MPADecodeContext *s, GranuleDef *g, int16_t *exponents)
static void switch_buffer (MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2)
static int huffman_decode (MPADecodeContext *s, GranuleDef *g, int16_t *exponents, int end_pos2)
static void reorder_block (MPADecodeContext *s, GranuleDef *g)
static void compute_stereo (MPADecodeContext *s, GranuleDef *g0, GranuleDef *g1)
static void compute_antialias (MPADecodeContext *s, GranuleDef *g)
static void compute_imdct (MPADecodeContext *s, GranuleDef *g, INTFLOAT *sb_samples, INTFLOAT *mdct_buf)
static int mp_decode_layer3 (MPADecodeContext *s)
static int mp_decode_frame (MPADecodeContext *s, OUT_INT **samples, const uint8_t *buf, int buf_size)
static int decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
static av_cold void mp_flush (MPADecodeContext *ctx)
static av_cold void flush (AVCodecContext *avctx)

Variables

static INTFLOAT is_table_lsf [2][2][16]
static int32_t scale_factor_mult [15][3]
static const int32_t scale_factor_mult2 [3][3]

Detailed Description

MPEG Audio decoder.

Definition in file mpegaudiodec_template.c.

Macro Definition Documentation

◆ BACKSTEP_SIZE

#define BACKSTEP_SIZE   512

Definition at line 54 of file mpegaudiodec_template.c.

Referenced by mp_decode_frame().

◆ EXTRABYTES

#define EXTRABYTES   24

Definition at line 55 of file mpegaudiodec_template.c.

◆ LAST_BUF_SIZE

#define LAST_BUF_SIZE   2 * BACKSTEP_SIZE + EXTRABYTES

Definition at line 56 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ HEADER_SIZE

#define HEADER_SIZE   4

Definition at line 102 of file mpegaudiodec_template.c.

◆ SCALE_GEN

#define SCALE_GEN ( v)
Value:
{ FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) }
FIXR_OLD
#define FIXR_OLD(a)
Definition mpegaudiodec_fixed.c:32

Definition at line 114 of file mpegaudiodec_template.c.

◆ C3

#define C3   FIXHR(0.86602540378443864676/2)

Definition at line 323 of file mpegaudiodec_template.c.

Referenced by idct4col_add(), imdct12(), imdct36(), and lbr_bank_c().

◆ C4

#define C4   FIXHR(0.70710678118654752439/2)

Definition at line 324 of file mpegaudiodec_template.c.

Referenced by imdct12(), imdct36(), lbr_bank_c(), and xbr_filter().

◆ C5

#define C5   FIXHR(0.51763809020504152469/2)

Definition at line 325 of file mpegaudiodec_template.c.

Referenced by imdct12(), and imdct36().

◆ C6

#define C6   FIXHR(1.93185165257813657349/4)

Definition at line 326 of file mpegaudiodec_template.c.

Referenced by imdct12().

◆ SPLIT

#define SPLIT ( dst,
sf,
n )
Value:
if (n == 3) { \
int m = (sf * 171) >> 9; \
dst = sf - 3 * m; \
sf = m; \
} else if (n == 4) { \
dst = sf & 3; \
sf >>= 2; \
} else if (n == 5) { \
int m = (sf * 205) >> 10; \
dst = sf - 5 * m; \
sf = m; \
} else if (n == 6) { \
int m = (sf * 171) >> 10; \
dst = sf - 6 * m; \
sf = m; \
} else { \
dst = 0; \
}
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition dsp.h:87

Definition at line 660 of file mpegaudiodec_template.c.

Referenced by lsf_sf_expand().

◆ READ_FLIP_SIGN

#define READ_FLIP_SIGN ( dst,
src )
Value:
v = -get_bits1(&s->gb); \
*(dst) = (*(src) ^ v) - v;
s
#define s(width, name)
Definition cbs_vp9.c:198
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition get_bits.h:391
src
#define src
Definition vp8dsp.c:248

Definition at line 752 of file mpegaudiodec_template.c.

Referenced by huffman_decode().

◆ ISQRT2

#define ISQRT2   FIXR(0.70710678118654752440)

Definition at line 942 of file mpegaudiodec_template.c.

Referenced by compute_stereo().

◆ AA

#define AA ( j)
Value:
do { \
SUINT tmp0 = ptr[-1-j]; \
SUINT tmp1 = ptr[ j]; \
SUINT tmp2 = MULH(tmp0 + tmp1, csa_table[j][0]); \
ptr[-1-j] = 4 * (tmp2 - MULH(tmp1, csa_table[j][2])); \
ptr[ j] = 4 * (tmp2 + MULH(tmp0, csa_table[j][3])); \
} while (0)
SUINT
#define SUINT
Definition dct32_template.c:30
csa_table
static const int32_t csa_table[8][4]
Definition mpegaudiodec_fixed.c:50
MULH
#define MULH
Definition mathops.h:42

Definition at line 1093 of file mpegaudiodec_template.c.

Referenced by compute_antialias().

Function Documentation

◆ region_offset2size()

void region_offset2size ( GranuleDef * g)
static

Convert region offsets to region sizes and truncate size to big_values.

Definition at line 127 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ init_short_region()

void init_short_region ( MPADecodeContext * s,
GranuleDef * g )
static

Definition at line 138 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ init_long_region()

void init_long_region ( MPADecodeContext * s,
GranuleDef * g,
int ra1,
int ra2 )
static

Definition at line 156 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ compute_band_indexes()

void compute_band_indexes ( MPADecodeContext * s,
GranuleDef * g )
static

Definition at line 166 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ l1_unscale()

int l1_unscale ( int n,
int mant,
int scale_factor )
inlinestatic

Definition at line 193 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer1(), and mp_decode_layer2().

◆ l2_unscale_group()

int l2_unscale_group ( int steps,
int mant,
int scale_factor )
inlinestatic

Definition at line 207 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer2().

◆ l3_unscale()

int l3_unscale ( int value,
int exponent )
inlinestatic

Definition at line 223 of file mpegaudiodec_template.c.

Referenced by huffman_decode().

◆ decode_init_static()

av_cold void decode_init_static ( void )
static

Definition at line 242 of file mpegaudiodec_template.c.

◆ decode_ctx_init()

av_cold int decode_ctx_init ( AVCodecContext * avctx,
MPADecodeContext * s )
static

Definition at line 284 of file mpegaudiodec_template.c.

Referenced by decode_init().

◆ decode_init()

av_cold int decode_init ( AVCodecContext * avctx)
static

Definition at line 318 of file mpegaudiodec_template.c.

◆ imdct12()

void imdct12 ( INTFLOAT * out,
SUINTFLOAT * in )
static

Definition at line 330 of file mpegaudiodec_template.c.

Referenced by compute_imdct().

◆ handle_crc()

int handle_crc ( MPADecodeContext * s,
int sec_len )
static

Definition at line 371 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer1(), mp_decode_layer2(), and mp_decode_layer3().

◆ mp_decode_layer1()

int mp_decode_layer1 ( MPADecodeContext * s)
static

Definition at line 398 of file mpegaudiodec_template.c.

Referenced by mp_decode_frame().

◆ mp_decode_layer2()

int mp_decode_layer2 ( MPADecodeContext * s)
static

Definition at line 468 of file mpegaudiodec_template.c.

Referenced by mp_decode_frame().

◆ lsf_sf_expand()

av_always_inline void lsf_sf_expand ( int * slen,
int sf,
int n1,
int n2,
int n3 )
static

Definition at line 680 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ exponents_from_scale_factors()

void exponents_from_scale_factors ( MPADecodeContext * s,
GranuleDef * g,
int16_t * exponents )
static

Definition at line 689 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ switch_buffer()

void switch_buffer ( MPADecodeContext * s,
int * pos,
int * end_pos,
int * end_pos2 )
static

Definition at line 726 of file mpegaudiodec_template.c.

Referenced by huffman_decode().

◆ huffman_decode()

int huffman_decode ( MPADecodeContext * s,
GranuleDef * g,
int16_t * exponents,
int end_pos2 )
static

Definition at line 757 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ reorder_block()

void reorder_block ( MPADecodeContext * s,
GranuleDef * g )
static

Definition at line 909 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ compute_stereo()

void compute_stereo ( MPADecodeContext * s,
GranuleDef * g0,
GranuleDef * g1 )
static

Definition at line 944 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ compute_antialias()

void compute_antialias ( MPADecodeContext * s,
GranuleDef * g )
static

Definition at line 1102 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ compute_imdct()

void compute_imdct ( MPADecodeContext * s,
GranuleDef * g,
INTFLOAT * sb_samples,
INTFLOAT * mdct_buf )
static

Definition at line 1133 of file mpegaudiodec_template.c.

Referenced by mp_decode_layer3().

◆ mp_decode_layer3()

int mp_decode_layer3 ( MPADecodeContext * s)
static

Definition at line 1213 of file mpegaudiodec_template.c.

Referenced by mp_decode_frame().

◆ mp_decode_frame()

int mp_decode_frame ( MPADecodeContext * s,
OUT_INT ** samples,
const uint8_t * buf,
int buf_size )
static

Definition at line 1472 of file mpegaudiodec_template.c.

Referenced by decode_frame().

◆ decode_frame()

int decode_frame ( AVCodecContext * avctx,
AVFrame * frame,
int * got_frame_ptr,
AVPacket * avpkt )
static

Definition at line 1559 of file mpegaudiodec_template.c.

◆ mp_flush()

av_cold void mp_flush ( MPADecodeContext * ctx)
static

Definition at line 1631 of file mpegaudiodec_template.c.

Referenced by flush().

◆ flush()

av_cold void flush ( AVCodecContext * avctx)
static

Definition at line 1639 of file mpegaudiodec_template.c.

Variable Documentation

◆ is_table_lsf

INTFLOAT is_table_lsf[2][2][16]
static

Definition at line 108 of file mpegaudiodec_template.c.

Referenced by compute_stereo(), and decode_init_static().

◆ scale_factor_mult

int32_t scale_factor_mult[15][3]
static

Definition at line 111 of file mpegaudiodec_template.c.

Referenced by decode_init_static(), and l1_unscale().

◆ scale_factor_mult2

const int32_t scale_factor_mult2[3][3]
static
Initial value:
= {
SCALE_GEN(4.0 / 3.0),
SCALE_GEN(4.0 / 5.0),
SCALE_GEN(4.0 / 9.0),
}
SCALE_GEN
#define SCALE_GEN(v)
Definition mpegaudiodec_template.c:114

Definition at line 117 of file mpegaudiodec_template.c.

Referenced by l2_unscale_group().

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