mpegaudiodec_template.c File Reference

MPEG Audio decoder. More...

#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/libm.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "mpegaudiodsp.h"
#include "mpegaudio.h"
#include "mpegaudiodecheader.h"
#include "mpegaudiodata.h"
#include "mpegaudiodectab.h"
#include "mpegaudio_tablegen.h"

Classes
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)   { FIXR_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (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)

Typedefs
typedef struct GranuleDef	GranuleDef
typedef struct MPADecodeContext	MPADecodeContext

Detailed Description

MPEG Audio decoder.

Macro Definition Documentation

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)

READ_FLIP_SIGN

#define READ_FLIP_SIGN	(		dst,
			src
	)

Value:

v      = -get_bits1(&s->gb);    \
    *(dst) = (*(src) ^ v) - v;

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;                    \
    }