PeerStreamer

/*

 * a52_internal.h

 * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>

 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>

 *

 * This file is part of a52dec, a free ATSC A-52 stream decoder.

 * See http://liba52.sourceforge.net/ for updates.

 *

 * a52dec is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * a52dec is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

typedef struct {

    uint8_t bai;                /* fine SNR offset, fast gain */

    uint8_t deltbae;                /* delta bit allocation exists */

    int8_t deltba[50];                /* per-band delta bit allocation */

} ba_t;

typedef struct {

    uint8_t exp[256];                /* decoded channel exponents */

    int8_t bap[256];                /* derived channel bit allocation */

} expbap_t;

struct a52_state_s {

    uint8_t fscod;                /* sample rate */

    uint8_t halfrate;                /* halfrate factor */

    uint8_t acmod;                /* coded channels */

    uint8_t lfeon;                /* coded lfe channel */

    level_t clev;                /* centre channel mix level */

    level_t slev;                /* surround channels mix level */

    int output;                        /* type of output */

    level_t level;                /* output level */

    sample_t bias;                /* output bias */

    int dynrnge;                /* apply dynamic range */

    level_t dynrng;                /* dynamic range */

    void * dynrngdata;                /* dynamic range callback funtion and data */

    level_t (* dynrngcall) (level_t range, void * dynrngdata);

    uint8_t chincpl;                /* channel coupled */

    uint8_t phsflginu;                /* phase flags in use (stereo only) */

    uint8_t cplstrtmant;        /* coupling channel start mantissa */

    uint8_t cplendmant;                /* coupling channel end mantissa */

    uint32_t cplbndstrc;        /* coupling band structure */

    level_t cplco[5][18];        /* coupling coordinates */

    /* derived information */

    uint8_t cplstrtbnd;                /* coupling start band (for bit allocation) */

    uint8_t ncplbnd;                /* number of coupling bands */

    uint8_t rematflg;                /* stereo rematrixing */

    uint8_t endmant[5];                /* channel end mantissa */

    uint16_t bai;                /* bit allocation information */

    uint32_t * buffer_start;

    uint16_t lfsr_state;        /* dither state */

    uint32_t bits_left;

    uint32_t current_word;

    uint8_t csnroffst;                /* coarse SNR offset */

    ba_t cplba;                        /* coupling bit allocation parameters */

    ba_t ba[5];                        /* channel bit allocation parameters */

    ba_t lfeba;                        /* lfe bit allocation parameters */

    uint8_t cplfleak;                /* coupling fast leak init */

    uint8_t cplsleak;                /* coupling slow leak init */

    expbap_t cpl_expbap;

    expbap_t fbw_expbap[5];

    expbap_t lfe_expbap;

    sample_t * samples;

    int downmixed;

};

#define LEVEL_PLUS6DB 2.0

#define LEVEL_PLUS3DB 1.4142135623730951

#define LEVEL_3DB 0.7071067811865476

#define LEVEL_45DB 0.5946035575013605

#define LEVEL_6DB 0.5

#define EXP_REUSE (0)

#define EXP_D15   (1)

#define EXP_D25   (2)

#define EXP_D45   (3)

#define DELTA_BIT_REUSE (0)

#define DELTA_BIT_NEW (1)

#define DELTA_BIT_NONE (2)

#define DELTA_BIT_RESERVED (3)

void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,

                       int start, int end, int fastleak, int slowleak,

                       expbap_t * expbap);

int a52_downmix_init (int input, int flags, level_t * level,

                      level_t clev, level_t slev);

int a52_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,

                       level_t clev, level_t slev);

void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,

                  level_t clev, level_t slev);

void a52_upmix (sample_t * samples, int acmod, int output);

void a52_imdct_init (uint32_t mm_accel);

void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias);

void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias);

//extern void (* a52_imdct_256) (sample_t data[], sample_t delay[], sample_t bias);

//extern void (* a52_imdct_512) (sample_t data[], sample_t delay[], sample_t bias);

#define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5)))

#ifndef LIBA52_FIXED

typedef sample_t quantizer_t;

#define SAMPLE(x) (x)

#define LEVEL(x) (x)

#define MUL(a,b) ((a) * (b))

#define MUL_L(a,b) ((a) * (b))

#define MUL_C(a,b) ((a) * (b))

#define DIV(a,b) ((a) / (b))

#define BIAS(x) ((x) + bias)

#else /* LIBA52_FIXED */

typedef int16_t quantizer_t;

#define SAMPLE(x) (sample_t)((x) * (1 << 30))

#define LEVEL(x) (level_t)((x) * (1 << 26))

#if 0

#define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30))

#define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26))

#elif 1

#define MUL(a,b) \

({ int32_t _ta=(a), _tb=(b), _tc; \

   _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)(((_tc >> 14))+ (((_ta >> 16)*(_tb >> 16)) << 2 )); })

#define MUL_L(a,b) \

({ int32_t _ta=(a), _tb=(b), _tc; \

   _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)((_tc >> 10) + (((_ta >> 16)*(_tb >> 16)) << 6)); })

#else

#define MUL(a,b) (((a) >> 15) * ((b) >> 15))

#define MUL_L(a,b) (((a) >> 13) * ((b) >> 13))

#endif

#define MUL_C(a,b) MUL_L (a, LEVEL (b))

#define DIV(a,b) ((((int64_t)LEVEL (a)) << 26) / (b))

#define BIAS(x) (x)

#endif