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684 lines
16 KiB
684 lines
16 KiB
/* |
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* parse.c |
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* |
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* Copyright (C) Aaron Holtzman - May 1999 |
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* |
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* This file is part of ac3dec, a free Dolby AC-3 stream decoder. |
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* |
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* ac3dec is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2, or (at your option) |
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* any later version. |
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* |
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* ac3dec is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with GNU Make; see the file COPYING. If not, write to |
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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* |
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*/ |
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#include <inttypes.h> |
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#include <string.h> |
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#include "ac3.h" |
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#include "ac3_internal.h" |
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#include "bitstream.h" |
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#include "tables.h" |
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extern stream_samples_t samples; // FIXME |
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static float delay[6][256]; |
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void ac3_init (void) |
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{ |
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imdct_init (); |
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} |
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static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3}; |
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int ac3_syncinfo (uint8_t * buf, int * flags, |
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int * sample_rate, int * bit_rate) |
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{ |
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static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112, |
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128, 160, 192, 224, 256, 320, 384, 448, |
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512, 576, 640}; |
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static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01}; |
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int frmsizecod; |
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int bitrate; |
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int half; |
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int acmod; |
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if ((buf[0] != 0x0b) || (buf[1] != 0x77)) // syncword |
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return 0; |
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if (buf[5] >= 0x60) // bsid >= 12 |
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return 0; |
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half = halfrate[buf[5] >> 3]; |
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// acmod, dsurmod and lfeon |
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acmod = buf[6] >> 5; |
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*flags = (((buf[6] & 0xf8) == 0x50) ? AC3_DOLBY : acmod) | |
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((buf[6] & lfeon[acmod]) ? AC3_LFE : 0); |
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frmsizecod = buf[4] & 63; |
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if (frmsizecod >= 38) |
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return 0; |
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bitrate = rate [frmsizecod >> 1]; |
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*bit_rate = (bitrate * 1000) >> half; |
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switch (buf[4] & 0xc0) { |
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case 0: // 48 KHz |
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*sample_rate = 48000 >> half; |
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return 4 * bitrate; |
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case 0x40: |
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*sample_rate = 44100 >> half; |
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return 2 * (320 * bitrate / 147 + (frmsizecod & 1)); |
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case 0x80: |
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*sample_rate = 32000 >> half; |
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return 6 * bitrate; |
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default: |
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return 0; |
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} |
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} |
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int ac3_frame (ac3_state_t * state, uint8_t * buf, int * flags, float * level, |
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float bias) |
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{ |
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static float clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB}; |
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static float slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB}; |
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int chaninfo; |
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int acmod; |
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state->fscod = buf[4] >> 6; |
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state->halfrate = halfrate[buf[5] >> 3]; |
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state->acmod = acmod = buf[6] >> 5; |
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bitstream_set_ptr (buf + 6); |
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bitstream_get (3); // skip acmod we already parsed |
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if ((acmod == 2) && (bitstream_get (2) == 2)) // dsurmod |
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acmod = AC3_DOLBY; |
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if ((acmod & 1) && (acmod != 1)) |
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state->clev = clev[bitstream_get (2)]; // cmixlev |
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if (acmod & 4) |
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state->slev = slev[bitstream_get (2)]; // surmixlev |
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state->lfeon = bitstream_get (1); |
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state->output = downmix_init (acmod, *flags, level, |
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state->clev, state->slev); |
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if (state->output < 0) |
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return 1; |
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*flags = state->output; |
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state->level = *level; |
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state->bias = bias; |
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chaninfo = !acmod; |
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do { |
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bitstream_get (5); // dialnorm |
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if (bitstream_get (1)) // compre |
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bitstream_get (8); // compr |
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if (bitstream_get (1)) // langcode |
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bitstream_get (8); // langcod |
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if (bitstream_get (1)) // audprodie |
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bitstream_get (7); // mixlevel + roomtyp |
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} while (chaninfo--); |
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bitstream_get (2); // copyrightb + origbs |
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if (bitstream_get (1)) // timecod1e |
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bitstream_get (14); // timecod1 |
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if (bitstream_get (1)) // timecod2e |
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bitstream_get (14); // timecod2 |
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if (bitstream_get (1)) { // addbsie |
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int addbsil; |
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addbsil = bitstream_get (6); |
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do { |
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bitstream_get (8); // addbsi |
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} while (addbsil--); |
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} |
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return 0; |
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} |
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static int parse_exponents (int expstr, int ngrps, uint8_t exponent, |
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uint8_t * dest) |
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{ |
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int exps; |
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while (ngrps--) { |
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exps = bitstream_get (7); |
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exponent += exp_1[exps]; |
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if (exponent > 24) |
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return 1; |
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switch (expstr) { |
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case EXP_D45: |
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*(dest++) = exponent; |
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*(dest++) = exponent; |
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case EXP_D25: |
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*(dest++) = exponent; |
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case EXP_D15: |
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*(dest++) = exponent; |
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} |
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exponent += exp_2[exps]; |
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if (exponent > 24) |
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return 1; |
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switch (expstr) { |
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case EXP_D45: |
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*(dest++) = exponent; |
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*(dest++) = exponent; |
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case EXP_D25: |
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*(dest++) = exponent; |
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case EXP_D15: |
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*(dest++) = exponent; |
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} |
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exponent += exp_3[exps]; |
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if (exponent > 24) |
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return 1; |
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switch (expstr) { |
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case EXP_D45: |
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*(dest++) = exponent; |
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*(dest++) = exponent; |
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case EXP_D25: |
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*(dest++) = exponent; |
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case EXP_D15: |
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*(dest++) = exponent; |
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} |
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} |
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return 0; |
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} |
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static int parse_deltba (int8_t * deltba) |
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{ |
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int deltnseg, deltlen, delta, j; |
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memset (deltba, 0, 50); |
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deltnseg = bitstream_get (3); |
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j = 0; |
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do { |
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j += bitstream_get (5); |
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deltlen = bitstream_get (4); |
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delta = bitstream_get (3); |
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delta -= (delta >= 4) ? 3 : 4; |
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if (!deltlen) |
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continue; |
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if (j + deltlen >= 50) |
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return 1; |
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while (deltlen--) |
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deltba[j++] = delta; |
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} while (deltnseg--); |
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return 0; |
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} |
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static inline int zero_snr_offsets (int nfchans, ac3_state_t * state) |
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{ |
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int i; |
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if ((state->csnroffst) || (state->cplinu && state->cplba.fsnroffst) || |
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(state->lfeon && state->lfeba.fsnroffst)) |
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return 0; |
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for (i = 0; i < nfchans; i++) |
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if (state->ba[i].fsnroffst) |
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return 0; |
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return 1; |
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} |
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static float q_1[2]; |
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static float q_2[2]; |
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static float q_4; |
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static int q_1_pointer; |
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static int q_2_pointer; |
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static int q_4_pointer; |
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#define GET_COEFF(COEFF,DITHER) \ |
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switch (bap[i]) { \ |
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case 0: \ |
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DITHER (scale_factor[exp[i]]); \ |
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\ |
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case -1: \ |
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if (q_1_pointer >= 0) { \ |
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COEFF (q_1[q_1_pointer--] * scale_factor[exp[i]]); \ |
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} else { \ |
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int code; \ |
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\ |
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code = bitstream_get (5); \ |
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\ |
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q_1_pointer = 1; \ |
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q_1[0] = q_1_2[code]; \ |
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q_1[1] = q_1_1[code]; \ |
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COEFF (q_1_0[code] * scale_factor[exp[i]]); \ |
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} \ |
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\ |
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case -2: \ |
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if (q_2_pointer >= 0) { \ |
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COEFF (q_2[q_2_pointer--] * scale_factor[exp[i]]); \ |
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} else { \ |
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int code; \ |
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\ |
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code = bitstream_get (7); \ |
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\ |
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q_2_pointer = 1; \ |
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q_2[0] = q_2_2[code]; \ |
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q_2[1] = q_2_1[code]; \ |
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COEFF (q_2_0[code] * scale_factor[exp[i]]); \ |
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} \ |
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\ |
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case 3: \ |
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COEFF (q_3[bitstream_get (3)] * scale_factor[exp[i]]); \ |
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\ |
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case -3: \ |
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if (q_4_pointer == 0) { \ |
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q_4_pointer = -1; \ |
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COEFF (q_4 * scale_factor[exp[i]]); \ |
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} else { \ |
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int code; \ |
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\ |
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code = bitstream_get (7); \ |
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\ |
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q_4_pointer = 0; \ |
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q_4 = q_4_1[code]; \ |
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COEFF (q_4_0[code] * scale_factor[exp[i]]); \ |
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} \ |
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\ |
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case 4: \ |
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COEFF (q_5[bitstream_get (4)] * scale_factor[exp[i]]); \ |
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\ |
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default: \ |
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COEFF (((int16_t)(bitstream_get(bap[i]) << (16 - bap[i]))) * \ |
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scale_factor[exp[i]]); \ |
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} |
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#define CHANNEL_COEFF(val) \ |
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coeff[i++] = val; \ |
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continue; |
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#define CHANNEL_DITHER(val) \ |
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if (dither) { \ |
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coeff[i++] = dither_gen () * val; \ |
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continue; \ |
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} else { \ |
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coeff[i++] = 0; \ |
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continue; \ |
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} |
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static uint16_t lfsr_state = 1; |
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static inline int16_t dither_gen(void) |
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{ |
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int16_t state; |
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state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8); |
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lfsr_state = (uint16_t) state; |
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return ((state * (int) (LEVEL_3DB * 256)) >> 8); |
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} |
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static void coeff_get (float * coeff, uint8_t * exp, int8_t * bap, |
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int dither, int end) |
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{ |
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int i; |
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i = 0; |
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while (i < end) |
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GET_COEFF (CHANNEL_COEFF, CHANNEL_DITHER); |
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} |
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#define COUPLING_COEFF(val) \ |
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cplcoeff = val; \ |
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break; |
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#define COUPLING_DITHER(val) \ |
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cplcoeff = val; \ |
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for (ch = 0; ch < nfchans; ch++) \ |
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if (state->chincpl[ch]) { \ |
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if (dithflag[ch]) \ |
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samples[ch][i] = \ |
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state->cplco[ch][bnd] * dither_gen () * cplcoeff; \ |
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else \ |
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samples[ch][i] = 0; \ |
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} \ |
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i++; \ |
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continue; |
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int ac3_block (ac3_state_t * state) |
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{ |
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static const uint8_t nfchans_tbl[8] = {2, 1, 2, 3, 3, 4, 4, 5}; |
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static int rematrix_band[4] = {25, 37, 61, 253}; |
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int i, nfchans, chaninfo; |
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uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl; |
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uint8_t blksw[5], dithflag[5]; |
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nfchans = nfchans_tbl[state->acmod]; |
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for (i = 0; i < nfchans; i++) |
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blksw[i] = bitstream_get (1); |
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for (i = 0; i < nfchans; i++) |
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dithflag[i] = bitstream_get (1); |
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chaninfo = !(state->acmod); |
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do { |
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if (bitstream_get (1)) // dynrnge |
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bitstream_get (8); // dynrng |
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} while (chaninfo--); |
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if (bitstream_get (1)) { // cplstre |
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state->cplinu = bitstream_get (1); |
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if (state->cplinu) { |
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static int bndtab[16] = {31, 35, 37, 39, 41, 42, 43, 44, |
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45, 45, 46, 46, 47, 47, 48, 48}; |
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int cplbegf; |
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int cplendf; |
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int ncplsubnd; |
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for (i = 0; i < nfchans; i++) |
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state->chincpl[i] = bitstream_get (1); |
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switch (state->acmod) { |
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case 0: case 1: |
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return 1; |
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case 2: |
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state->phsflginu = bitstream_get (1); |
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} |
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cplbegf = bitstream_get (4); |
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cplendf = bitstream_get (4); |
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if (cplendf + 3 - cplbegf < 0) |
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return 1; |
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state->ncplbnd = ncplsubnd = cplendf + 3 - cplbegf; |
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state->cplstrtbnd = bndtab[cplbegf]; |
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state->cplstrtmant = cplbegf * 12 + 37; |
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state->cplendmant = cplendf * 12 + 73; |
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for (i = 0; i < ncplsubnd - 1; i++) { |
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state->cplbndstrc[i] = bitstream_get (1); |
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state->ncplbnd -= state->cplbndstrc[i]; |
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} |
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state->cplbndstrc[i] = 0; // last value is a sentinel |
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} |
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} |
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if (state->cplinu) { |
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int j, cplcoe; |
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cplcoe = 0; |
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for (i = 0; i < nfchans; i++) |
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if (state->chincpl[i]) |
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if (bitstream_get (1)) { // cplcoe |
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int mstrcplco, cplcoexp, cplcomant; |
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cplcoe = 1; |
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mstrcplco = 3 * bitstream_get (2); |
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for (j = 0; j < state->ncplbnd; j++) { |
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cplcoexp = bitstream_get (4); |
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cplcomant = bitstream_get (4); |
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if (cplcoexp == 15) |
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cplcomant <<= 14; |
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else |
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cplcomant = (cplcomant | 0x10) << 13; |
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state->cplco[i][j] = |
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cplcomant * scale_factor[cplcoexp + mstrcplco]; |
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} |
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} |
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if ((state->acmod == 2) && state->phsflginu && cplcoe) |
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for (j = 0; j < state->ncplbnd; j++) |
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if (bitstream_get (1)) // phsflg |
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state->cplco[1][j] = -state->cplco[1][j]; |
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} |
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if ((state->acmod == 2) && (bitstream_get (1))) { // rematstr |
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int end; |
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end = (state->cplinu) ? state->cplstrtmant : 253; |
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i = 0; |
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do |
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state->rematflg[i] = bitstream_get (1); |
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while (rematrix_band[i++] < end); |
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} |
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cplexpstr = EXP_REUSE; |
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lfeexpstr = EXP_REUSE; |
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if (state->cplinu) |
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cplexpstr = bitstream_get (2); |
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for (i = 0; i < nfchans; i++) |
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chexpstr[i] = bitstream_get (2); |
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if (state->lfeon) |
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lfeexpstr = bitstream_get (1); |
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for (i = 0; i < nfchans; i++) |
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if (chexpstr[i] != EXP_REUSE) { |
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if (state->cplinu && state->chincpl[i]) |
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state->endmant[i] = state->cplstrtmant; |
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else { |
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int chbwcod; |
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chbwcod = bitstream_get (6); |
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if (chbwcod > 60) |
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return 1; |
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state->endmant[i] = chbwcod * 3 + 73; |
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} |
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} |
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do_bit_alloc = 0; |
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if (cplexpstr != EXP_REUSE) { |
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int cplabsexp, ncplgrps; |
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do_bit_alloc = 1; |
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ncplgrps = ((state->cplendmant - state->cplstrtmant) / |
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(3 << (cplexpstr - 1))); |
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cplabsexp = bitstream_get (4) << 1; |
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if (parse_exponents (cplexpstr, ncplgrps, cplabsexp, |
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state->cpl_exp + state->cplstrtmant)) |
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return 1; |
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} |
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for (i = 0; i < nfchans; i++) |
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if (chexpstr[i] != EXP_REUSE) { |
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int grp_size, nchgrps; |
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|
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do_bit_alloc = 1; |
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grp_size = 3 << (chexpstr[i] - 1); |
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nchgrps = (state->endmant[i] + grp_size - 4) / grp_size; |
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state->fbw_exp[i][0] = bitstream_get (4); |
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if (parse_exponents (chexpstr[i], nchgrps, state->fbw_exp[i][0], |
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state->fbw_exp[i] + 1)) |
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return 1; |
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bitstream_get (2); // gainrng |
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} |
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if (lfeexpstr != EXP_REUSE) { |
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do_bit_alloc = 1; |
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state->lfe_exp[0] = bitstream_get (4); |
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if (parse_exponents (lfeexpstr, 2, state->lfe_exp[0], |
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state->lfe_exp + 1)) |
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return 1; |
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} |
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|
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if (bitstream_get (1)) { // baie |
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do_bit_alloc = 1; |
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state->sdcycod = bitstream_get (2); |
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state->fdcycod = bitstream_get (2); |
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state->sgaincod = bitstream_get (2); |
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state->dbpbcod = bitstream_get (2); |
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state->floorcod = bitstream_get (3); |
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} |
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if (bitstream_get (1)) { //snroffste |
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do_bit_alloc = 1; |
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state->csnroffst = bitstream_get (6); |
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if (state->cplinu) { |
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state->cplba.fsnroffst = bitstream_get (4); |
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state->cplba.fgaincod = bitstream_get (3); |
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} |
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for (i = 0; i < nfchans; i++) { |
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state->ba[i].fsnroffst = bitstream_get (4); |
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state->ba[i].fgaincod = bitstream_get (3); |
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} |
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if (state->lfeon) { |
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state->lfeba.fsnroffst = bitstream_get (4); |
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state->lfeba.fgaincod = bitstream_get (3); |
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} |
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} |
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if ((state->cplinu) && (bitstream_get (1))) { // cplleake |
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do_bit_alloc = 1; |
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state->cplfleak = 2304 - (bitstream_get (3) << 8); |
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state->cplsleak = 2304 - (bitstream_get (3) << 8); |
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} |
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|
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if (bitstream_get (1)) { // deltbaie |
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do_bit_alloc = 1; |
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if (state->cplinu) |
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state->cplba.deltbae = bitstream_get (2); |
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for (i = 0; i < nfchans; i++) |
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state->ba[i].deltbae = bitstream_get (2); |
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if (state->cplinu && (state->cplba.deltbae == DELTA_BIT_NEW) && |
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parse_deltba (state->cplba.deltba)) |
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return 1; |
|
for (i = 0; i < nfchans; i++) |
|
if ((state->ba[i].deltbae == DELTA_BIT_NEW) && |
|
parse_deltba (state->ba[i].deltba)) |
|
return 1; |
|
} |
|
|
|
if (do_bit_alloc) { |
|
if (zero_snr_offsets (nfchans, state)) { |
|
memset (state->cpl_bap, 0, sizeof (state->cpl_bap)); |
|
memset (state->fbw_bap, 0, sizeof (state->fbw_bap)); |
|
memset (state->lfe_bap, 0, sizeof (state->lfe_bap)); |
|
} else { |
|
if (state->cplinu) |
|
bit_allocate (state, &state->cplba, state->cplstrtbnd, |
|
state->cplstrtmant, state->cplendmant, |
|
state->cplfleak, state->cplsleak, |
|
state->cpl_exp, state->cpl_bap); |
|
for (i = 0; i < nfchans; i++) |
|
bit_allocate (state, state->ba + i, 0, 0, state->endmant[i], |
|
0, 0, state->fbw_exp[i], state->fbw_bap[i]); |
|
if (state->lfeon) { |
|
state->lfeba.deltbae = DELTA_BIT_NONE; |
|
bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0, |
|
state->lfe_exp, state->lfe_bap); |
|
} |
|
} |
|
} |
|
|
|
if (bitstream_get (1)) { // skiple |
|
i = bitstream_get (9); // skipl |
|
while (i--) |
|
bitstream_get (8); |
|
} |
|
|
|
q_1_pointer = q_2_pointer = q_4_pointer = -1; |
|
done_cpl = 0; |
|
|
|
for (i = 0; i < nfchans; i++) { |
|
int j; |
|
|
|
coeff_get (samples[i], state->fbw_exp[i], state->fbw_bap[i], |
|
dithflag[i], state->endmant[i]); |
|
|
|
if (state->cplinu && state->chincpl[i]) { |
|
if (!done_cpl) { |
|
int i, i_end, bnd, sub_bnd, ch; |
|
float cplcoeff; |
|
|
|
done_cpl = 1; |
|
|
|
#define bap state->cpl_bap |
|
#define exp state->cpl_exp |
|
|
|
sub_bnd = bnd = 0; |
|
i = state->cplstrtmant; |
|
while (i < state->cplendmant) { |
|
i_end = i + 12; |
|
while (state->cplbndstrc[sub_bnd++]) |
|
i_end += 12; |
|
|
|
while (i < i_end) { |
|
GET_COEFF (COUPLING_COEFF, COUPLING_DITHER); |
|
for (ch = 0; ch < nfchans; ch++) |
|
if (state->chincpl[ch]) |
|
samples[ch][i] = |
|
state->cplco[ch][bnd] * cplcoeff; |
|
i++; |
|
} |
|
bnd++; |
|
} |
|
|
|
#undef bap |
|
#undef exp |
|
} |
|
j = state->cplendmant; |
|
} else |
|
j = state->endmant[i]; |
|
for (; j < 256; j++) |
|
samples[i][j] = 0; |
|
} |
|
|
|
if (state->acmod == 2) { |
|
int j, end, band; |
|
|
|
end = ((state->endmant[0] < state->endmant[1]) ? |
|
state->endmant[0] : state->endmant[1]); |
|
|
|
i = 0; |
|
j = 13; |
|
do { |
|
if (!state->rematflg[i]) { |
|
j = rematrix_band[i++]; |
|
continue; |
|
} |
|
band = rematrix_band[i++]; |
|
if (band > end) |
|
band = end; |
|
do { |
|
float tmp0, tmp1; |
|
|
|
tmp0 = samples[0][j]; |
|
tmp1 = samples[1][j]; |
|
samples[0][j] = tmp0 + tmp1; |
|
samples[1][j] = tmp0 - tmp1; |
|
} while (++j < band); |
|
} while (j < end); |
|
} |
|
|
|
if (state->lfeon) { |
|
coeff_get (samples[5], state->lfe_exp, state->lfe_bap, 0, 7); |
|
#if 0 |
|
for (i = 7; i < 256; i++) |
|
samples[5][i] = 0; |
|
#endif |
|
} |
|
|
|
for (i = 0; i < nfchans; i++) |
|
if (blksw[i]) |
|
imdct_256 (samples[i], delay[i]); |
|
else |
|
imdct_512 (samples[i], delay[i]); |
|
|
|
#if 0 |
|
if (state->lfeon) |
|
imdct_512 (samples[5], delay[5]); |
|
#endif |
|
|
|
downmix (*samples, state->acmod, state->output, state->level, state->bias, |
|
state->clev, state->slev); |
|
|
|
return 0; |
|
}
|
|
|