/* * Mpeg Layer-3 audio decoder * -------------------------- * copyright (c) 1995,1996,1997 by Michael Hipp. * All rights reserved. See also 'README' */ #include #include "mpg123.h" #include "mpglib.h" #include "huffman.h" #define MPEG1 /* These should all be constants setup once using init_layer3_const */ static real __ispow[8207]; static real aa_ca[8], aa_cs[8]; static real COS1[12][6]; static real win[4][36]; static real win1[4][36]; static real gainpow2[256 + 118 + 4]; static real COS9[9]; static real COS6_1, COS6_2; static real tfcos36[9]; static real tfcos12[3]; struct bandInfoStruct { short longIdx[23]; short longDiff[22]; short shortIdx[14]; short shortDiff[13]; }; #ifndef _WIN32 static inline real find_pow(int i) #else static real find_pow(int i) #endif { return (i > 0 && i < 8207) ? __ispow[i] : 1; } struct bandInfoStruct bandInfo[9] = { /* MPEG 1.0 */ {{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576}, {4, 4, 4, 4, 4, 4, 6, 6, 8, 8, 10, 12, 16, 20, 24, 28, 34, 42, 50, 54, 76, 158}, {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 30 * 3, 40 * 3, 52 * 3, 66 * 3, 84 * 3, 106 * 3, 136 * 3, 192 * 3}, {4, 4, 4, 4, 6, 8, 10, 12, 14, 18, 22, 30, 56}}, {{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576}, {4, 4, 4, 4, 4, 4, 6, 6, 6, 8, 10, 12, 16, 18, 22, 28, 34, 40, 46, 54, 54, 192}, {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 28 * 3, 38 * 3, 50 * 3, 64 * 3, 80 * 3, 100 * 3, 126 * 3, 192 * 3}, {4, 4, 4, 4, 6, 6, 10, 12, 14, 16, 20, 26, 66}}, {{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576}, {4, 4, 4, 4, 4, 4, 6, 6, 8, 10, 12, 16, 20, 24, 30, 38, 46, 56, 68, 84, 102, 26}, {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 30 * 3, 42 * 3, 58 * 3, 78 * 3, 104 * 3, 138 * 3, 180 * 3, 192 * 3}, {4, 4, 4, 4, 6, 8, 12, 16, 20, 26, 34, 42, 12}}, /* MPEG 2.0 */ {{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}, {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54}, {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 24 * 3, 32 * 3, 42 * 3, 56 * 3, 74 * 3, 100 * 3, 132 * 3, 174 * 3, 192 * 3}, {4, 4, 4, 6, 6, 8, 10, 14, 18, 26, 32, 42, 18}}, {{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 330, 394, 464, 540, 576}, {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 18, 22, 26, 32, 38, 46, 52, 64, 70, 76, 36}, {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 26 * 3, 36 * 3, 48 * 3, 62 * 3, 80 * 3, 104 * 3, 136 * 3, 180 * 3, 192 * 3}, {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 32, 44, 12}}, {{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}, {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54}, {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 26 * 3, 36 * 3, 48 * 3, 62 * 3, 80 * 3, 104 * 3, 134 * 3, 174 * 3, 192 * 3}, {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18}}, /* MPEG 2.5 */ {{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}, {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54}, {0, 12, 24, 36, 54, 78, 108, 144, 186, 240, 312, 402, 522, 576}, {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18}}, {{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576}, {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54}, {0, 12, 24, 36, 54, 78, 108, 144, 186, 240, 312, 402, 522, 576}, {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18}}, {{0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576}, {12, 12, 12, 12, 12, 12, 16, 20, 24, 28, 32, 40, 48, 56, 64, 76, 90, 2, 2, 2, 2, 2}, {0, 24, 48, 72, 108, 156, 216, 288, 372, 480, 486, 492, 498, 576}, {8, 8, 8, 12, 16, 20, 24, 28, 36, 2, 2, 2, 26}}, }; static int mapbuf0[9][152]; static int mapbuf1[9][156]; static int mapbuf2[9][44]; static int *map[9][3]; static int *mapend[9][3]; static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */ static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */ static real tan1_1[16], tan2_1[16], tan1_2[16], tan2_2[16]; static real pow1_1[2][16], pow2_1[2][16], pow1_2[2][16], pow2_2[2][16]; /* * init constant tables for layer-3 */ void init_layer3_const(void) { int i, j, k, l; for (i = -256; i < 118 + 4; i++) gainpow2[i + 256] = pow((double) 2.0, -0.25 * (double) (i + 210)); for (i = 0; i < 8207; i++) __ispow[i] = pow((double) i, (double) 4.0 / 3.0); for (i = 0; i < 8; i++) { static double Ci[8] = { -0.6, -0.535, -0.33, -0.185, -0.095, -0.041, -0.0142, -0.0037 }; double sq = sqrt(1.0 + Ci[i] * Ci[i]); aa_cs[i] = 1.0 / sq; aa_ca[i] = Ci[i] / sq; } for (i = 0; i < 18; i++) { win[0][i] = win[1][i] = 0.5 * sin(M_PI / 72.0 * (double) (2 * (i + 0) + 1)) / cos(M_PI * (double) (2 * (i + 0) + 19) / 72.0); win[0][i + 18] = win[3][i + 18] = 0.5 * sin(M_PI / 72.0 * (double) (2 * (i + 18) + 1)) / cos(M_PI * (double) (2 * (i + 18) + 19) / 72.0); } for (i = 0; i < 6; i++) { win[1][i + 18] = 0.5 / cos(M_PI * (double) (2 * (i + 18) + 19) / 72.0); win[3][i + 12] = 0.5 / cos(M_PI * (double) (2 * (i + 12) + 19) / 72.0); win[1][i + 24] = 0.5 * sin(M_PI / 24.0 * (double) (2 * i + 13)) / cos(M_PI * (double) (2 * (i + 24) + 19) / 72.0); win[1][i + 30] = win[3][i] = 0.0; win[3][i + 6] = 0.5 * sin(M_PI / 24.0 * (double) (2 * i + 1)) / cos(M_PI * (double) (2 * (i + 6) + 19) / 72.0); } for (i = 0; i < 9; i++) COS9[i] = cos(M_PI / 18.0 * (double) i); for (i = 0; i < 9; i++) tfcos36[i] = 0.5 / cos(M_PI * (double) (i * 2 + 1) / 36.0); for (i = 0; i < 3; i++) tfcos12[i] = 0.5 / cos(M_PI * (double) (i * 2 + 1) / 12.0); COS6_1 = cos(M_PI / 6.0 * (double) 1); COS6_2 = cos(M_PI / 6.0 * (double) 2); for (i = 0; i < 12; i++) { win[2][i] = 0.5 * sin(M_PI / 24.0 * (double) (2 * i + 1)) / cos(M_PI * (double) (2 * i + 7) / 24.0); for (j = 0; j < 6; j++) COS1[i][j] = cos(M_PI / 24.0 * (double) ((2 * i + 7) * (2 * j + 1))); } for (j = 0; j < 4; j++) { static int len[4] = { 36, 36, 12, 36 }; for (i = 0; i < len[j]; i += 2) win1[j][i] = +win[j][i]; for (i = 1; i < len[j]; i += 2) win1[j][i] = -win[j][i]; } for (i = 0; i < 16; i++) { double t = tan((double) i * M_PI / 12.0); tan1_1[i] = t / (1.0 + t); tan2_1[i] = 1.0 / (1.0 + t); tan1_2[i] = M_SQRT2 * t / (1.0 + t); tan2_2[i] = M_SQRT2 / (1.0 + t); for (j = 0; j < 2; j++) { double base = pow(2.0, -0.25 * (j + 1.0)); double p1 = 1.0, p2 = 1.0; if (i > 0) { if (i & 1) p1 = pow(base, (i + 1.0) * 0.5); else p2 = pow(base, i * 0.5); } pow1_1[j][i] = p1; pow2_1[j][i] = p2; pow1_2[j][i] = M_SQRT2 * p1; pow2_2[j][i] = M_SQRT2 * p2; } } for (j = 0; j < 9; j++) { struct bandInfoStruct *bi = &bandInfo[j]; int *mp; int cb, lwin; short *bdf; mp = map[j][0] = mapbuf0[j]; bdf = bi->longDiff; for (i = 0, cb = 0; cb < 8; cb++, i += *bdf++) { *mp++ = (*bdf) >> 1; *mp++ = i; *mp++ = 3; *mp++ = cb; } bdf = bi->shortDiff + 3; for (cb = 3; cb < 13; cb++) { int l = (*bdf++) >> 1; for (lwin = 0; lwin < 3; lwin++) { *mp++ = l; *mp++ = i + lwin; *mp++ = lwin; *mp++ = cb; } i += 6 * l; } mapend[j][0] = mp; mp = map[j][1] = mapbuf1[j]; bdf = bi->shortDiff + 0; for (i = 0, cb = 0; cb < 13; cb++) { int l = (*bdf++) >> 1; for (lwin = 0; lwin < 3; lwin++) { *mp++ = l; *mp++ = i + lwin; *mp++ = lwin; *mp++ = cb; } i += 6 * l; } mapend[j][1] = mp; mp = map[j][2] = mapbuf2[j]; bdf = bi->longDiff; for (cb = 0; cb < 22; cb++) { *mp++ = (*bdf++) >> 1; *mp++ = cb; } mapend[j][2] = mp; } for (i = 0; i < 5; i++) { for (j = 0; j < 6; j++) { for (k = 0; k < 6; k++) { int n = k + j * 6 + i * 36; i_slen2[n] = i | (j << 3) | (k << 6) | (3 << 12); } } } for (i = 0; i < 4; i++) { for (j = 0; j < 4; j++) { for (k = 0; k < 4; k++) { int n = k + j * 4 + i * 16; i_slen2[n + 180] = i | (j << 3) | (k << 6) | (4 << 12); } } } for (i = 0; i < 4; i++) { for (j = 0; j < 3; j++) { int n = j + i * 3; i_slen2[n + 244] = i | (j << 3) | (5 << 12); n_slen2[n + 500] = i | (j << 3) | (2 << 12) | (1 << 15); } } for (i = 0; i < 5; i++) { for (j = 0; j < 5; j++) { for (k = 0; k < 4; k++) { for (l = 0; l < 4; l++) { int n = l + k * 4 + j * 16 + i * 80; n_slen2[n] = i | (j << 3) | (k << 6) | (l << 9) | (0 << 12); } } } } for (i = 0; i < 5; i++) { for (j = 0; j < 5; j++) { for (k = 0; k < 4; k++) { int n = k + j * 4 + i * 20; n_slen2[n + 400] = i | (j << 3) | (k << 6) | (1 << 12); } } } } /* MP3 file specific rates */ void init_layer3_sample_limits(struct mpstr *mp, int down_sample_sblimit) { int i, j; for (j = 0; j < 9; j++) { for (i = 0; i < 23; i++) { (mp->longLimit)[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1; if ((mp->longLimit)[j][i] > (down_sample_sblimit)) (mp->longLimit)[j][i] = down_sample_sblimit; } for (i = 0; i < 14; i++) { (mp->shortLimit)[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1; if ((mp->shortLimit)[j][i] > (down_sample_sblimit)) (mp->shortLimit)[j][i] = down_sample_sblimit; } } } /* * read additional side information */ #ifdef MPEG1 static int III_get_side_info_1(struct mpstr *mp, struct III_sideinfo *si, int stereo, int ms_stereo, long sfreq, int single) { int ch, gr; int powdiff = (single == 3) ? 4 : 0; si->main_data_begin = getbits(mp, 9); if (stereo == 1) si->private_bits = getbits_fast(mp, 5); else si->private_bits = getbits_fast(mp, 3); for (ch = 0; ch < stereo; ch++) { si->ch[ch].gr[0].scfsi = -1; si->ch[ch].gr[1].scfsi = getbits_fast(mp, 4); } for (gr = 0; gr < 2; gr++) { for (ch = 0; ch < stereo; ch++) { register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]); gr_info->part2_3_length = getbits(mp, 12); gr_info->big_values = getbits_fast(mp, 9); if (gr_info->big_values > 288) { debug_printf("%d big_values too large!\n", __LINE__); gr_info->big_values = 288; } gr_info->pow2gain = gainpow2 + 256 - getbits_fast(mp, 8) + powdiff; if (ms_stereo) gr_info->pow2gain += 2; gr_info->scalefac_compress = getbits_fast(mp, 4); /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */ if (get1bit(mp)) { int i; gr_info->block_type = getbits_fast(mp, 2); gr_info->mixed_block_flag = get1bit(mp); gr_info->table_select[0] = getbits_fast(mp, 5); gr_info->table_select[1] = getbits_fast(mp, 5); /* * table_select[2] not needed, because there is no region2, * but to satisfy some verifications tools we set it either. */ gr_info->table_select[2] = 0; for (i = 0; i < 3; i++) gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(mp, 3) << 3); if (gr_info->block_type == 0) { debug_printf("%d Blocktype == 0 and window-switching == 1 not allowed.\n", __LINE__); return (1); } /* region_count/start parameters are implicit in this case. */ gr_info->region1start = 36 >> 1; gr_info->region2start = 576 >> 1; } else { int i, r0c, r1c; for (i = 0; i < 3; i++) gr_info->table_select[i] = getbits_fast(mp, 5); r0c = getbits_fast(mp, 4); r1c = getbits_fast(mp, 3); gr_info->region1start = bandInfo[sfreq].longIdx[r0c + 1] >> 1; gr_info->region2start = bandInfo[sfreq].longIdx[r0c + 1 + r1c + 1] >> 1; gr_info->block_type = 0; gr_info->mixed_block_flag = 0; } gr_info->preflag = get1bit(mp); gr_info->scalefac_scale = get1bit(mp); gr_info->count1table_select = get1bit(mp); } } return (0); } #endif /* * Side Info for MPEG 2.0 / LSF */ static int III_get_side_info_2(struct mpstr *mp, struct III_sideinfo *si, int stereo, int ms_stereo, long sfreq, int single) { int ch; int powdiff = (single == 3) ? 4 : 0; si->main_data_begin = getbits(mp, 8); if (stereo == 1) si->private_bits = get1bit(mp); else si->private_bits = getbits_fast(mp, 2); for (ch = 0; ch < stereo; ch++) { register struct gr_info_s *gr_info = &(si->ch[ch].gr[0]); gr_info->part2_3_length = getbits(mp, 12); gr_info->big_values = getbits_fast(mp, 9); if (gr_info->big_values > 288) { debug_printf("%d big_values too large!\n", __LINE__); gr_info->big_values = 288; } gr_info->pow2gain = gainpow2 + 256 - getbits_fast(mp, 8) + powdiff; if (ms_stereo) gr_info->pow2gain += 2; gr_info->scalefac_compress = getbits(mp, 9); /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */ if (get1bit(mp)) { int i; gr_info->block_type = getbits_fast(mp, 2); gr_info->mixed_block_flag = get1bit(mp); gr_info->table_select[0] = getbits_fast(mp, 5); gr_info->table_select[1] = getbits_fast(mp, 5); /* * table_select[2] not needed, because there is no region2, * but to satisfy some verifications tools we set it either. */ gr_info->table_select[2] = 0; for (i = 0; i < 3; i++) gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(mp, 3) << 3); if (gr_info->block_type == 0) { debug_printf("%d Blocktype == 0 and window-switching == 1 not allowed.\n", __LINE__); return (1); } /* region_count/start parameters are implicit in this case. */ /* check this again! */ if (gr_info->block_type == 2) gr_info->region1start = 36 >> 1; else if (sfreq == 8) /* check this for 2.5 and sfreq=8 */ gr_info->region1start = 108 >> 1; else gr_info->region1start = 54 >> 1; gr_info->region2start = 576 >> 1; } else { int i, r0c, r1c; for (i = 0; i < 3; i++) gr_info->table_select[i] = getbits_fast(mp, 5); r0c = getbits_fast(mp, 4); r1c = getbits_fast(mp, 3); gr_info->region1start = bandInfo[sfreq].longIdx[r0c + 1] >> 1; gr_info->region2start = bandInfo[sfreq].longIdx[r0c + 1 + r1c + 1] >> 1; gr_info->block_type = 0; gr_info->mixed_block_flag = 0; } gr_info->scalefac_scale = get1bit(mp); gr_info->count1table_select = get1bit(mp); } return (0); } /* * read scalefactors */ #ifdef MPEG1 static int III_get_scale_factors_1(struct mpstr *mp, int *scf, struct gr_info_s *gr_info) { static unsigned char slen[2][16] = { {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4}, {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3} }; int numbits; int num0 = slen[0][gr_info->scalefac_compress]; int num1 = slen[1][gr_info->scalefac_compress]; if (gr_info->block_type == 2) { int i = 18; numbits = (num0 + num1) * 18; if (gr_info->mixed_block_flag) { for (i = 8; i; i--) *scf++ = getbits_fast(mp, num0); i = 9; numbits -= num0; /* num0 * 17 + num1 * 18 */ } for (; i; i--) *scf++ = getbits_fast(mp, num0); for (i = 18; i; i--) *scf++ = getbits_fast(mp, num1); *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */ } else { int i; int scfsi = gr_info->scfsi; if (scfsi < 0) { /* scfsi < 0 => granule == 0 */ for (i = 11; i; i--) *scf++ = getbits_fast(mp, num0); for (i = 10; i; i--) *scf++ = getbits_fast(mp, num1); numbits = (num0 + num1) * 10 + num0; } else { numbits = 0; if (!(scfsi & 0x8)) { for (i = 6; i; i--) *scf++ = getbits_fast(mp, num0); numbits += num0 * 6; } else { *scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */ *scf++ = 0; *scf++ = 0; *scf++ = 0; } if (!(scfsi & 0x4)) { for (i = 5; i; i--) *scf++ = getbits_fast(mp, num0); numbits += num0 * 5; } else { *scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */ *scf++ = 0; *scf++ = 0; } if (!(scfsi & 0x2)) { for (i = 5; i; i--) *scf++ = getbits_fast(mp, num1); numbits += num1 * 5; } else { *scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */ *scf++ = 0; *scf++ = 0; } if (!(scfsi & 0x1)) { for (i = 5; i; i--) *scf++ = getbits_fast(mp, num1); numbits += num1 * 5; } else { *scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */ *scf++ = 0; *scf++ = 0; } } *scf++ = 0; /* no l[21] in original sources */ } return numbits; } #endif static int III_get_scale_factors_2(struct mpstr *mp, int *scf, struct gr_info_s *gr_info, int i_stereo) { unsigned char *pnt; int i, j; unsigned int slen; int n = 0; int numbits = 0; static unsigned char stab[3][6][4] = { {{6, 5, 5, 5}, {6, 5, 7, 3}, {11, 10, 0, 0}, {7, 7, 7, 0}, {6, 6, 6, 3}, {8, 8, 5, 0}}, {{9, 9, 9, 9}, {9, 9, 12, 6}, {18, 18, 0, 0}, {12, 12, 12, 0}, {12, 9, 9, 6}, {15, 12, 9, 0}}, {{6, 9, 9, 9}, {6, 9, 12, 6}, {15, 18, 0, 0}, {6, 15, 12, 0}, {6, 12, 9, 6}, {6, 18, 9, 0}} }; if (i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */ slen = i_slen2[gr_info->scalefac_compress >> 1]; else slen = n_slen2[gr_info->scalefac_compress]; gr_info->preflag = (slen >> 15) & 0x1; n = 0; if (gr_info->block_type == 2) { n++; if (gr_info->mixed_block_flag) n++; } pnt = stab[n][(slen >> 12) & 0x7]; for (i = 0; i < 4; i++) { int num = slen & 0x7; slen >>= 3; if (num) { for (j = 0; j < (int) (pnt[i]); j++) *scf++ = getbits_fast(mp, num); numbits += pnt[i] * num; } else { for (j = 0; j < (int) (pnt[i]); j++) *scf++ = 0; } } n = (n << 1) + 1; for (i = 0; i < n; i++) *scf++ = 0; return numbits; } static int pretab1[22] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0 }; static int pretab2[22] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; /* * don't forget to apply the same changes to III_dequantize_sample_ms() !!! */ static int III_dequantize_sample(struct mpstr *mp, real xr[SBLIMIT][SSLIMIT], int *scf, struct gr_info_s *gr_info, int sfreq, int part2bits) { int shift = 1 + gr_info->scalefac_scale; real *xrpnt = (real *) xr; real *toomuch = (real *) xr + (SBLIMIT * SBLIMIT * sizeof(real)); int l[3], l3; int part2remain = gr_info->part2_3_length - part2bits; int *me; { int bv = gr_info->big_values; int region1 = gr_info->region1start; int region2 = gr_info->region2start; l3 = ((576 >> 1) - bv) >> 1; /* * we may lose the 'odd' bit here !! * check this later again */ if (bv <= region1) { l[0] = bv; l[1] = 0; l[2] = 0; } else { l[0] = region1; if (bv <= region2) { l[1] = bv - l[0]; l[2] = 0; } else { l[1] = region2 - l[0]; l[2] = bv - region2; } } } if (gr_info->block_type == 2) { /* * decoding with short or mixed mode BandIndex table */ int i, max[4]; int step = 0, lwin = 0, cb = 0; register real v = 0.0; register int *m, mc; if (gr_info->mixed_block_flag) { max[3] = -1; max[0] = max[1] = max[2] = 2; m = map[sfreq][0]; me = mapend[sfreq][0]; } else { max[0] = max[1] = max[2] = max[3] = -1; /* max[3] not really needed in this case */ m = map[sfreq][1]; me = mapend[sfreq][1]; } mc = 0; for (i = 0; i < 2; i++) { int lp = l[i]; struct newhuff *h = ht + gr_info->table_select[i]; for (; lp; lp--, mc--) { register int x, y; if ((!mc)) { mc = *m++; if ((xrpnt = ((real *) xr) + (*m++)) > toomuch) { return 1; } lwin = *m++; cb = *m++; if (lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } { register short *val = h->table; while ((y = *val++) < 0) { if (get1bit(mp)) val -= y; part2remain--; } x = y >> 4; y &= 0xf; } if (x == 15) { max[lwin] = cb; part2remain -= h->linbits + 1; x += getbits(mp, h->linbits); if (get1bit(mp)) *xrpnt = find_pow(x) * -1 * v; else *xrpnt = find_pow(x) * v; } else if (x) { max[lwin] = cb; if (get1bit(mp)) *xrpnt = find_pow(x) * -1 * v; else *xrpnt = find_pow(x) * v; part2remain--; } else *xrpnt = 0.0; if ((xrpnt += step) > toomuch) { return 1; } if (y == 15) { max[lwin] = cb; part2remain -= h->linbits + 1; y += getbits(mp, h->linbits); if (get1bit(mp)) *xrpnt = find_pow(y) * -1 * v; else *xrpnt = find_pow(y) * v; } else if (y) { max[lwin] = cb; if (get1bit(mp)) *xrpnt = find_pow(y) * -1 * v; else *xrpnt = find_pow(y) * v; part2remain--; } else *xrpnt = 0.0; if ((xrpnt += step) > toomuch) { return 1; } } } for (; l3 && (part2remain > 0); l3--) { struct newhuff *h = htc + gr_info->count1table_select; register short *val = h->table, a; while ((a = *val++) < 0) { part2remain--; if (part2remain < 0) { part2remain++; a = 0; break; } if (get1bit(mp)) val -= a; } for (i = 0; i < 4; i++) { if (!(i & 1)) { if (!mc) { mc = *m++; if ((xrpnt = ((real *) xr) + (*m++)) > toomuch) { return 1; } lwin = *m++; cb = *m++; if (lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } mc--; } if ((a & (0x8 >> i))) { max[lwin] = cb; part2remain--; if (part2remain < 0) { part2remain++; break; } if (get1bit(mp)) *xrpnt = -v; else *xrpnt = v; } else *xrpnt = 0.0; if ((xrpnt += step) > toomuch) { return 1; } } } while (m < me) { if (!mc) { mc = *m++; if ((xrpnt = ((real *) xr) + *m++) > toomuch) { return 1; } if ((*m++) == 3) step = 1; else step = 3; m++; /* cb */ } mc--; *xrpnt = 0.0; if ((xrpnt += step) > toomuch) { return 1; } *xrpnt = 0.0; if ((xrpnt += step) > toomuch) { return 1; } /* we could add a little opt. here: * if we finished a band for window 3 or a long band * further bands could copied in a simple loop without a * special 'map' decoding */ } gr_info->maxband[0] = max[0] + 1; gr_info->maxband[1] = max[1] + 1; gr_info->maxband[2] = max[2] + 1; gr_info->maxbandl = max[3] + 1; { int rmax = max[0] > max[1] ? max[0] : max[1]; rmax = (rmax > max[2] ? rmax : max[2]) + 1; gr_info->maxb = rmax ? (mp->shortLimit)[sfreq][rmax] : (mp->longLimit)[sfreq][max[3] + 1]; } } else { /* * decoding with 'long' BandIndex table (block_type != 2) */ int *pretab = gr_info->preflag ? pretab1 : pretab2; int i, max = -1; int cb = 0; register int *m = map[sfreq][2]; register real v = 0.0; register int mc = 0; #if 0 me = mapend[sfreq][2]; #endif /* * long hash table values */ for (i = 0; i < 3; i++) { int lp = l[i]; struct newhuff *h = ht + gr_info->table_select[i]; for (; lp; lp--, mc--) { int x, y; if (!mc) { unsigned sanity; mc = *m++; if ((unsigned) *scf < 100 && (unsigned) *pretab < 100) { sanity = (((*scf++) + (*pretab++)) << shift); //v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; if (sanity < 100) { v = gr_info->pow2gain[sanity]; cb = *m++; } else { return 1; } } else { return 1; } } { register short *val = h->table; while ((y = *val++) < 0) { if (get1bit(mp)) val -= y; part2remain--; } x = y >> 4; y &= 0xf; } if (xrpnt >= toomuch) { return 1; } if (x == 15) { max = cb; part2remain -= h->linbits + 1; x += getbits(mp, h->linbits); if (get1bit(mp)) *xrpnt++ = find_pow(x) * -1 * v; else *xrpnt++ = find_pow(x) * v; } else if (x) { max = cb; if (get1bit(mp)) *xrpnt++ = find_pow(x) * -1 * v; else *xrpnt++ = find_pow(x) * v; part2remain--; } else *xrpnt++ = 0.0; if (y == 15) { max = cb; part2remain -= h->linbits + 1; y += getbits(mp, h->linbits); if (get1bit(mp)) *xrpnt++ = find_pow(y) * -1 * v; else *xrpnt++ = find_pow(y) * v; } else if (y) { max = cb; if (get1bit(mp)) *xrpnt++ = find_pow(y) * -1 * v; else *xrpnt++ = find_pow(y) * v; part2remain--; } else *xrpnt++ = 0.0; } } /* * short (count1table) values */ for (; l3 && (part2remain > 0); l3--) { struct newhuff *h = htc + gr_info->count1table_select; register short *val = h->table, a; while ((a = *val++) < 0) { part2remain--; if (part2remain < 0) { part2remain++; a = 0; break; } if (get1bit(mp)) val -= a; } for (i = 0; i < 4; i++) { if (!(i & 1)) { if (!mc) { mc = *m++; cb = *m++; v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; } mc--; } if ((a & (0x8 >> i))) { max = cb; part2remain--; if (part2remain < 0) { part2remain++; break; } if (get1bit(mp)) *xrpnt++ = -v; else *xrpnt++ = v; } else *xrpnt++ = 0.0; } } /* * zero part */ for (i = (&xr[SBLIMIT][0] - xrpnt) >> 1; i; i--) { *xrpnt++ = 0.0; *xrpnt++ = 0.0; } gr_info->maxbandl = max + 1; gr_info->maxb = (mp->longLimit)[sfreq][gr_info->maxbandl]; } while (part2remain > 16) { getbits(mp, 16); /* Dismiss stuffing Bits */ part2remain -= 16; } if (part2remain > 0) getbits(mp, part2remain); #if 0 else if (part2remain < 0) { debug_printf("mpg123: %d Can't rewind stream by %d bits!\n", -part2remain, __LINE__); return 1; /* -> error */ } #endif return 0; } #if 0 static int III_dequantize_sample_ms(real xr[2][SBLIMIT][SSLIMIT], int *scf, struct gr_info_s *gr_info, int sfreq, int part2bits) { ma int shift = 1 + gr_info->scalefac_scale; real *xrpnt = (real *) xr[1]; real *xr0pnt = (real *) xr[0]; int l[3], l3; int part2remain = gr_info->part2_3_length - part2bits; int *me; { int bv = gr_info->big_values; int region1 = gr_info->region1start; int region2 = gr_info->region2start; l3 = ((576 >> 1) - bv) >> 1; /* * we may lose the 'odd' bit here !! * check this later gain */ if (bv <= region1) { l[0] = bv; l[1] = 0; l[2] = 0; } else { l[0] = region1; if (bv <= region2) { l[1] = bv - l[0]; l[2] = 0; } else { l[1] = region2 - l[0]; l[2] = bv - region2; } } } if (gr_info->block_type == 2) { int i, max[4]; int step = 0, lwin = 0, cb = 0; register real v = 0.0; register int *m, mc = 0; if (gr_info->mixed_block_flag) { max[3] = -1; max[0] = max[1] = max[2] = 2; m = map[sfreq][0]; me = mapend[sfreq][0]; } else { max[0] = max[1] = max[2] = max[3] = -1; /* max[3] not really needed in this case */ m = map[sfreq][1]; me = mapend[sfreq][1]; } for (i = 0; i < 2; i++) { int lp = l[i]; struct newhuff *h = ht + gr_info->table_select[i]; for (; lp; lp--, mc--) { int x, y; if (!mc) { mc = *m++; xrpnt = ((real *) xr[1]) + *m; xr0pnt = ((real *) xr[0]) + *m++; lwin = *m++; cb = *m++; if (lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } { register short *val = h->table; while ((y = *val++) < 0) { if (get1bit(mp)) val -= y; part2remain--; } x = y >> 4; y &= 0xf; } if (x == 15) { max[lwin] = cb; part2remain -= h->linbits + 1; x += getbits(mp, h->linbits); if (get1bit(mp)) { real a = find_pow(x) * v; *xrpnt = *xr0pnt + a; *xr0pnt -= a; } else { real a = find_pow(x) * v; *xrpnt = *xr0pnt - a; *xr0pnt += a; } } else if (x) { max[lwin] = cb; if (get1bit(mp)) { real a = find_pow(x) * v; *xrpnt = *xr0pnt + a; *xr0pnt -= a; } else { real a = find_pow(x) * v; *xrpnt = *xr0pnt - a; *xr0pnt += a; } part2remain--; } else *xrpnt = *xr0pnt; xrpnt += step; xr0pnt += step; if (y == 15) { max[lwin] = cb; part2remain -= h->linbits + 1; y += getbits(mp, h->linbits); if (get1bit(mp)) { real a = find_pow(y) * v; *xrpnt = *xr0pnt + a; *xr0pnt -= a; } else { real a = find_pow(y) * v; *xrpnt = *xr0pnt - a; *xr0pnt += a; } } else if (y) { max[lwin] = cb; if (get1bit(mp)) { real a = find_pow(y) * v; *xrpnt = *xr0pnt + a; *xr0pnt -= a; } else { real a = find_pow(y) * v; *xrpnt = *xr0pnt - a; *xr0pnt += a; } part2remain--; } else *xrpnt = *xr0pnt; xrpnt += step; xr0pnt += step; } } for (; l3 && (part2remain > 0); l3--) { struct newhuff *h = htc + gr_info->count1table_select; register short *val = h->table, a; while ((a = *val++) < 0) { part2remain--; if (part2remain < 0) { part2remain++; a = 0; break; } if (get1bit(mp)) val -= a; } for (i = 0; i < 4; i++) { if (!(i & 1)) { if (!mc) { mc = *m++; xrpnt = ((real *) xr[1]) + *m; xr0pnt = ((real *) xr[0]) + *m++; lwin = *m++; cb = *m++; if (lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } mc--; } if ((a & (0x8 >> i))) { max[lwin] = cb; part2remain--; if (part2remain < 0) { part2remain++; break; } if (get1bit(mp)) { *xrpnt = *xr0pnt + v; *xr0pnt -= v; } else { *xrpnt = *xr0pnt - v; *xr0pnt += v; } } else *xrpnt = *xr0pnt; xrpnt += step; xr0pnt += step; } } while (m < me) { if (!mc) { mc = *m++; xrpnt = ((real *) xr[1]) + *m; xr0pnt = ((real *) xr[0]) + *m++; if (*m++ == 3) step = 1; else step = 3; m++; /* cb */ } mc--; *xrpnt = *xr0pnt; xrpnt += step; xr0pnt += step; *xrpnt = *xr0pnt; xrpnt += step; xr0pnt += step; /* we could add a little opt. here: * if we finished a band for window 3 or a long band * further bands could copied in a simple loop without a * special 'map' decoding */ } gr_info->maxband[0] = max[0] + 1; gr_info->maxband[1] = max[1] + 1; gr_info->maxband[2] = max[2] + 1; gr_info->maxbandl = max[3] + 1; { int rmax = max[0] > max[1] ? max[0] : max[1]; rmax = (rmax > max[2] ? rmax : max[2]) + 1; gr_info->maxb = rmax ? (mp->shortLimit)[sfreq][rmax] : (mp->longLimit)[sfreq][max[3] + 1]; } } else { int *pretab = gr_info->preflag ? pretab1 : pretab2; int i, max = -1; int cb = 0; register int mc = 0, *m = map[sfreq][2]; register real v = 0.0; #if 0 me = mapend[sfreq][2]; #endif for (i = 0; i < 3; i++) { int lp = l[i]; struct newhuff *h = ht + gr_info->table_select[i]; for (; lp; lp--, mc--) { int x, y; if (!mc) { mc = *m++; cb = *m++; v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; } { register short *val = h->table; while ((y = *val++) < 0) { if (get1bit(mp)) val -= y; part2remain--; } x = y >> 4; y &= 0xf; } if (x == 15) { max = cb; part2remain -= h->linbits + 1; x += getbits(mp, h->linbits); if (get1bit(mp)) { real a = find_pow(x) * v; *xrpnt++ = *xr0pnt + a; *xr0pnt++ -= a; } else { real a = find_pow(x) * v; *xrpnt++ = *xr0pnt - a; *xr0pnt++ += a; } } else if (x) { max = cb; if (get1bit(mp)) { real a = find_pow(x) * v; *xrpnt++ = *xr0pnt + a; *xr0pnt++ -= a; } else { real a = find_pow(x) * v; *xrpnt++ = *xr0pnt - a; *xr0pnt++ += a; } part2remain--; } else *xrpnt++ = *xr0pnt++; if (y == 15) { max = cb; part2remain -= h->linbits + 1; y += getbits(mp, h->linbits); if (get1bit(mp)) { real a = find_pow(y) * v; *xrpnt++ = *xr0pnt + a; *xr0pnt++ -= a; } else { real a = find_pow(y) * v; *xrpnt++ = *xr0pnt - a; *xr0pnt++ += a; } } else if (y) { max = cb; if (get1bit(mp)) { real a = find_pow(y) * v; *xrpnt++ = *xr0pnt + a; *xr0pnt++ -= a; } else { real a = find_pow(y) * v; *xrpnt++ = *xr0pnt - a; *xr0pnt++ += a; } part2remain--; } else *xrpnt++ = *xr0pnt++; } } for (; l3 && (part2remain > 0); l3--) { struct newhuff *h = htc + gr_info->count1table_select; register short *val = h->table, a; while ((a = *val++) < 0) { part2remain--; if (part2remain < 0) { part2remain++; a = 0; break; } if (get1bit(mp)) val -= a; } for (i = 0; i < 4; i++) { if (!(i & 1)) { if (!mc) { mc = *m++; cb = *m++; v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; } mc--; } if ((a & (0x8 >> i))) { max = cb; part2remain--; if (part2remain <= 0) { part2remain++; break; } if (get1bit(mp)) { *xrpnt++ = *xr0pnt + v; *xr0pnt++ -= v; } else { *xrpnt++ = *xr0pnt - v; *xr0pnt++ += v; } } else *xrpnt++ = *xr0pnt++; } } for (i = (&xr[1][SBLIMIT][0] - xrpnt) >> 1; i; i--) { *xrpnt++ = *xr0pnt++; *xrpnt++ = *xr0pnt++; } gr_info->maxbandl = max + 1; gr_info->maxb = longLimit[sfreq][gr_info->maxbandl]; } while (part2remain > 16) { getbits(mp, 16); /* Dismiss stuffing Bits */ part2remain -= 16; } if (part2remain > 0) getbits(mp, part2remain); else if (part2remain < 0) { debug_printf("mpg123_ms: %d: Can't rewind stream by %d bits!\n", -part2remain, __LINE__); return 1; /* -> error */ } return 0; } #endif /* * III_stereo: calculate real channel values for Joint-I-Stereo-mode */ static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT], int *scalefac, struct gr_info_s *gr_info, int sfreq, int ms_stereo, int lsf) { real(*xr)[SBLIMIT * SSLIMIT] = (real(*)[SBLIMIT * SSLIMIT]) xr_buf; struct bandInfoStruct *bi = &bandInfo[sfreq]; real *tab1, *tab2; if (lsf) { int p = gr_info->scalefac_compress & 0x1; if (ms_stereo) { tab1 = pow1_2[p]; tab2 = pow2_2[p]; } else { tab1 = pow1_1[p]; tab2 = pow2_1[p]; } } else { if (ms_stereo) { tab1 = tan1_2; tab2 = tan2_2; } else { tab1 = tan1_1; tab2 = tan2_1; } } if (gr_info->block_type == 2) { int lwin, do_l = 0; if (gr_info->mixed_block_flag) do_l = 1; for (lwin = 0; lwin < 3; lwin++) { /* process each window */ /* get first band with zero values */ int is_p, sb, idx, sfb = gr_info->maxband[lwin]; /* sfb is minimal 3 for mixed mode */ if (sfb > 3) do_l = 0; for (; sfb < 12; sfb++) { is_p = scalefac[sfb * 3 + lwin - gr_info->mixed_block_flag]; /* scale: 0-15 */ if (is_p != 7) { real t1, t2; sb = bi->shortDiff[sfb]; idx = bi->shortIdx[sfb] + lwin; t1 = tab1[is_p]; t2 = tab2[is_p]; for (; sb > 0; sb--, idx += 3) { real v = xr[0][idx]; xr[0][idx] = v * t1; xr[1][idx] = v * t2; } } } #if 1 /* in the original: copy 10 to 11 , here: copy 11 to 12 maybe still wrong??? (copy 12 to 13?) */ is_p = scalefac[11 * 3 + lwin - gr_info->mixed_block_flag]; /* scale: 0-15 */ sb = bi->shortDiff[12]; idx = bi->shortIdx[12] + lwin; #else is_p = scalefac[10 * 3 + lwin - gr_info->mixed_block_flag]; /* scale: 0-15 */ sb = bi->shortDiff[11]; idx = bi->shortIdx[11] + lwin; #endif if (is_p != 7) { real t1, t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for (; sb > 0; sb--, idx += 3) { real v = xr[0][idx]; xr[0][idx] = v * t1; xr[1][idx] = v * t2; } } } /* end for(lwin; .. ; . ) */ if (do_l) { /* also check l-part, if ALL bands in the three windows are 'empty' * and mode = mixed_mode */ int sfb = gr_info->maxbandl; int idx = bi->longIdx[sfb]; for (; sfb < 8; sfb++) { int sb = bi->longDiff[sfb]; int is_p = scalefac[sfb]; /* scale: 0-15 */ if (is_p != 7) { real t1, t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for (; sb > 0; sb--, idx++) { real v = xr[0][idx]; xr[0][idx] = v * t1; xr[1][idx] = v * t2; } } else idx += sb; } } } else { /* ((gr_info->block_type != 2)) */ int sfb = gr_info->maxbandl; int is_p, idx = bi->longIdx[sfb]; for (; sfb < 21; sfb++) { int sb = bi->longDiff[sfb]; is_p = scalefac[sfb]; /* scale: 0-15 */ if (is_p != 7) { real t1, t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for (; sb > 0; sb--, idx++) { real v = xr[0][idx]; xr[0][idx] = v * t1; xr[1][idx] = v * t2; } } else idx += sb; } is_p = scalefac[20]; /* copy l-band 20 to l-band 21 */ if (is_p != 7) { int sb; real t1 = tab1[is_p], t2 = tab2[is_p]; for (sb = bi->longDiff[21]; sb > 0; sb--, idx++) { real v = xr[0][idx]; xr[0][idx] = v * t1; xr[1][idx] = v * t2; } } } /* ... */ } static void III_antialias(real xr[SBLIMIT][SSLIMIT], struct gr_info_s *gr_info) { int sblim; if (gr_info->block_type == 2) { if (!gr_info->mixed_block_flag) return; sblim = 1; } else { sblim = gr_info->maxb - 1; } /* 31 alias-reduction operations between each pair of sub-bands */ /* with 8 butterflies between each pair */ { int sb; real *xr1 = (real *) xr[1]; for (sb = sblim; sb; sb--, xr1 += 10) { int ss; real *cs = aa_cs, *ca = aa_ca; real *xr2 = xr1; for (ss = 7; ss >= 0; ss--) { /* upper and lower butterfly inputs */ register real bu = *--xr2, bd = *xr1; *xr2 = (bu * (*cs)) - (bd * (*ca)); *xr1++ = (bd * (*cs++)) + (bu * (*ca++)); } } } } /* DCT insipired by Jeff Tsay's DCT from the maplay package this is an optimized version with manual unroll. References: [1] S. Winograd: "On Computing the Discrete Fourier Transform", Mathematics of Computation, Volume 32, Number 141, January 1978, Pages 175-199 */ static void dct36(real * inbuf, real * o1, real * o2, real * wintab, real * tsbuf) { { register real *in = inbuf; in[17] += in[16]; in[16] += in[15]; in[15] += in[14]; in[14] += in[13]; in[13] += in[12]; in[12] += in[11]; in[11] += in[10]; in[10] += in[9]; in[9] += in[8]; in[8] += in[7]; in[7] += in[6]; in[6] += in[5]; in[5] += in[4]; in[4] += in[3]; in[3] += in[2]; in[2] += in[1]; in[1] += in[0]; in[17] += in[15]; in[15] += in[13]; in[13] += in[11]; in[11] += in[9]; in[9] += in[7]; in[7] += in[5]; in[5] += in[3]; in[3] += in[1]; { #define MACRO0(v) { \ real tmp; \ out2[9+(v)] = (tmp = sum0 + sum1) * w[27+(v)]; \ out2[8-(v)] = tmp * w[26-(v)]; } \ sum0 -= sum1; \ ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \ ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)]; #define MACRO1(v) { \ real sum0,sum1; \ sum0 = tmp1a + tmp2a; \ sum1 = (tmp1b + tmp2b) * tfcos36[(v)]; \ MACRO0(v); } #define MACRO2(v) { \ real sum0,sum1; \ sum0 = tmp2a - tmp1a; \ sum1 = (tmp2b - tmp1b) * tfcos36[(v)]; \ MACRO0(v); } register const real *c = COS9; register real *out2 = o2; register real *w = wintab; register real *out1 = o1; register real *ts = tsbuf; real ta33, ta66, tb33, tb66; ta33 = in[2 * 3 + 0] * c[3]; ta66 = in[2 * 6 + 0] * c[6]; tb33 = in[2 * 3 + 1] * c[3]; tb66 = in[2 * 6 + 1] * c[6]; { real tmp1a, tmp2a, tmp1b, tmp2b; tmp1a = in[2 * 1 + 0] * c[1] + ta33 + in[2 * 5 + 0] * c[5] + in[2 * 7 + 0] * c[7]; tmp1b = in[2 * 1 + 1] * c[1] + tb33 + in[2 * 5 + 1] * c[5] + in[2 * 7 + 1] * c[7]; tmp2a = in[2 * 0 + 0] + in[2 * 2 + 0] * c[2] + in[2 * 4 + 0] * c[4] + ta66 + in[2 * 8 + 0] * c[8]; tmp2b = in[2 * 0 + 1] + in[2 * 2 + 1] * c[2] + in[2 * 4 + 1] * c[4] + tb66 + in[2 * 8 + 1] * c[8]; MACRO1(0); MACRO2(8); } { real tmp1a, tmp2a, tmp1b, tmp2b; tmp1a = (in[2 * 1 + 0] - in[2 * 5 + 0] - in[2 * 7 + 0]) * c[3]; tmp1b = (in[2 * 1 + 1] - in[2 * 5 + 1] - in[2 * 7 + 1]) * c[3]; tmp2a = (in[2 * 2 + 0] - in[2 * 4 + 0] - in[2 * 8 + 0]) * c[6] - in[2 * 6 + 0] + in[2 * 0 + 0]; tmp2b = (in[2 * 2 + 1] - in[2 * 4 + 1] - in[2 * 8 + 1]) * c[6] - in[2 * 6 + 1] + in[2 * 0 + 1]; MACRO1(1); MACRO2(7); } { real tmp1a, tmp2a, tmp1b, tmp2b; tmp1a = in[2 * 1 + 0] * c[5] - ta33 - in[2 * 5 + 0] * c[7] + in[2 * 7 + 0] * c[1]; tmp1b = in[2 * 1 + 1] * c[5] - tb33 - in[2 * 5 + 1] * c[7] + in[2 * 7 + 1] * c[1]; tmp2a = in[2 * 0 + 0] - in[2 * 2 + 0] * c[8] - in[2 * 4 + 0] * c[2] + ta66 + in[2 * 8 + 0] * c[4]; tmp2b = in[2 * 0 + 1] - in[2 * 2 + 1] * c[8] - in[2 * 4 + 1] * c[2] + tb66 + in[2 * 8 + 1] * c[4]; MACRO1(2); MACRO2(6); } { real tmp1a, tmp2a, tmp1b, tmp2b; tmp1a = in[2 * 1 + 0] * c[7] - ta33 + in[2 * 5 + 0] * c[1] - in[2 * 7 + 0] * c[5]; tmp1b = in[2 * 1 + 1] * c[7] - tb33 + in[2 * 5 + 1] * c[1] - in[2 * 7 + 1] * c[5]; tmp2a = in[2 * 0 + 0] - in[2 * 2 + 0] * c[4] + in[2 * 4 + 0] * c[8] + ta66 - in[2 * 8 + 0] * c[2]; tmp2b = in[2 * 0 + 1] - in[2 * 2 + 1] * c[4] + in[2 * 4 + 1] * c[8] + tb66 - in[2 * 8 + 1] * c[2]; MACRO1(3); MACRO2(5); } { real sum0, sum1; sum0 = in[2 * 0 + 0] - in[2 * 2 + 0] + in[2 * 4 + 0] - in[2 * 6 + 0] + in[2 * 8 + 0]; sum1 = (in[2 * 0 + 1] - in[2 * 2 + 1] + in[2 * 4 + 1] - in[2 * 6 + 1] + in[2 * 8 + 1]) * tfcos36[4]; MACRO0(4); } } } } /* * new DCT12 */ static void dct12(real * in, real * rawout1, real * rawout2, register real * wi, register real * ts) { #define DCT12_PART1 \ in5 = in[5*3]; \ in5 += (in4 = in[4*3]); \ in4 += (in3 = in[3*3]); \ in3 += (in2 = in[2*3]); \ in2 += (in1 = in[1*3]); \ in1 += (in0 = in[0*3]); \ \ in5 += in3; in3 += in1; \ \ in2 *= COS6_1; \ in3 *= COS6_1; \ #define DCT12_PART2 \ in0 += in4 * COS6_2; \ \ in4 = in0 + in2; \ in0 -= in2; \ \ in1 += in5 * COS6_2; \ \ in5 = (in1 + in3) * tfcos12[0]; \ in1 = (in1 - in3) * tfcos12[2]; \ \ in3 = in4 + in5; \ in4 -= in5; \ \ in2 = in0 + in1; \ in0 -= in1; { real in0, in1, in2, in3, in4, in5; register real *out1 = rawout1; ts[SBLIMIT * 0] = out1[0]; ts[SBLIMIT * 1] = out1[1]; ts[SBLIMIT * 2] = out1[2]; ts[SBLIMIT * 3] = out1[3]; ts[SBLIMIT * 4] = out1[4]; ts[SBLIMIT * 5] = out1[5]; DCT12_PART1 { real tmp0, tmp1 = (in0 - in4); { real tmp2 = (in1 - in5) * tfcos12[1]; tmp0 = tmp1 + tmp2; tmp1 -= tmp2; } ts[(17 - 1) * SBLIMIT] = out1[17 - 1] + tmp0 * wi[11 - 1]; ts[(12 + 1) * SBLIMIT] = out1[12 + 1] + tmp0 * wi[6 + 1]; ts[(6 + 1) * SBLIMIT] = out1[6 + 1] + tmp1 * wi[1]; ts[(11 - 1) * SBLIMIT] = out1[11 - 1] + tmp1 * wi[5 - 1]; } DCT12_PART2 ts[(17 - 0) * SBLIMIT] = out1[17 - 0] + in2 * wi[11 - 0]; ts[(12 + 0) * SBLIMIT] = out1[12 + 0] + in2 * wi[6 + 0]; ts[(12 + 2) * SBLIMIT] = out1[12 + 2] + in3 * wi[6 + 2]; ts[(17 - 2) * SBLIMIT] = out1[17 - 2] + in3 * wi[11 - 2]; ts[(6 + 0) * SBLIMIT] = out1[6 + 0] + in0 * wi[0]; ts[(11 - 0) * SBLIMIT] = out1[11 - 0] + in0 * wi[5 - 0]; ts[(6 + 2) * SBLIMIT] = out1[6 + 2] + in4 * wi[2]; ts[(11 - 2) * SBLIMIT] = out1[11 - 2] + in4 * wi[5 - 2]; } in++; { real in0, in1, in2, in3, in4, in5; register real *out2 = rawout2; DCT12_PART1 { real tmp0, tmp1 = (in0 - in4); { real tmp2 = (in1 - in5) * tfcos12[1]; tmp0 = tmp1 + tmp2; tmp1 -= tmp2; } out2[5 - 1] = tmp0 * wi[11 - 1]; out2[0 + 1] = tmp0 * wi[6 + 1]; ts[(12 + 1) * SBLIMIT] += tmp1 * wi[1]; ts[(17 - 1) * SBLIMIT] += tmp1 * wi[5 - 1]; } DCT12_PART2 out2[5 - 0] = in2 * wi[11 - 0]; out2[0 + 0] = in2 * wi[6 + 0]; out2[0 + 2] = in3 * wi[6 + 2]; out2[5 - 2] = in3 * wi[11 - 2]; ts[(12 + 0) * SBLIMIT] += in0 * wi[0]; ts[(17 - 0) * SBLIMIT] += in0 * wi[5 - 0]; ts[(12 + 2) * SBLIMIT] += in4 * wi[2]; ts[(17 - 2) * SBLIMIT] += in4 * wi[5 - 2]; } in++; { real in0, in1, in2, in3, in4, in5; register real *out2 = rawout2; out2[12] = out2[13] = out2[14] = out2[15] = out2[16] = out2[17] = 0.0; DCT12_PART1 { real tmp0, tmp1 = (in0 - in4); { real tmp2 = (in1 - in5) * tfcos12[1]; tmp0 = tmp1 + tmp2; tmp1 -= tmp2; } out2[11 - 1] = tmp0 * wi[11 - 1]; out2[6 + 1] = tmp0 * wi[6 + 1]; out2[0 + 1] += tmp1 * wi[1]; out2[5 - 1] += tmp1 * wi[5 - 1]; } DCT12_PART2 out2[11 - 0] = in2 * wi[11 - 0]; out2[6 + 0] = in2 * wi[6 + 0]; out2[6 + 2] = in3 * wi[6 + 2]; out2[11 - 2] = in3 * wi[11 - 2]; out2[0 + 0] += in0 * wi[0]; out2[5 - 0] += in0 * wi[5 - 0]; out2[0 + 2] += in4 * wi[2]; out2[5 - 2] += in4 * wi[5 - 2]; } } /* * III_hybrid */ static void III_hybrid(struct mpstr *mp, real fsIn[SBLIMIT][SSLIMIT], real tsOut[SSLIMIT][SBLIMIT], int ch, struct gr_info_s *gr_info) { real *tspnt = (real *) tsOut; real(*block)[2][SBLIMIT * SSLIMIT] = mp->hybrid_block; int *blc = mp->hybrid_blc; real *rawout1, *rawout2; int bt; int sb = 0; { int b = blc[ch]; rawout1 = block[b][ch]; b = -b + 1; rawout2 = block[b][ch]; blc[ch] = b; } if (gr_info->mixed_block_flag) { sb = 2; dct36(fsIn[0], rawout1, rawout2, win[0], tspnt); dct36(fsIn[1], rawout1 + 18, rawout2 + 18, win1[0], tspnt + 1); rawout1 += 36; rawout2 += 36; tspnt += 2; } bt = gr_info->block_type; if (bt == 2) { for (; sb < gr_info->maxb; sb += 2, tspnt += 2, rawout1 += 36, rawout2 += 36) { dct12(fsIn[sb], rawout1, rawout2, win[2], tspnt); dct12(fsIn[sb + 1], rawout1 + 18, rawout2 + 18, win1[2], tspnt + 1); } } else { for (; sb < gr_info->maxb; sb += 2, tspnt += 2, rawout1 += 36, rawout2 += 36) { dct36(fsIn[sb], rawout1, rawout2, win[bt], tspnt); dct36(fsIn[sb + 1], rawout1 + 18, rawout2 + 18, win1[bt], tspnt + 1); } } for (; sb < SBLIMIT; sb++, tspnt++) { int i; for (i = 0; i < SSLIMIT; i++) { tspnt[i * SBLIMIT] = *rawout1++; *rawout2++ = 0.0; } } } /* * main layer3 handler */ int do_layer3(struct mpstr *mp, unsigned char *pcm_sample, int *pcm_point) { int gr, ch, ss, clip = 0; int scalefacs[39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */ struct III_sideinfo sideinfo; struct frame *fr; int stereo, single, sfreq; int ms_stereo, i_stereo; int stereo1, granules; fr = &(mp->fr); stereo = fr->stereo; single = fr->single; sfreq = fr->sampling_frequency; if (stereo == 1) { /* stream is mono */ stereo1 = 1; single = 0; } else if (single >= 0) /* stream is stereo, but force to mono */ stereo1 = 1; else stereo1 = 2; if (fr->mode == MPG_MD_JOINT_STEREO) { ms_stereo = fr->mode_ext & 0x2; i_stereo = fr->mode_ext & 0x1; } else ms_stereo = i_stereo = 0; if (fr->lsf) { granules = 1; if (III_get_side_info_2(mp, &sideinfo, stereo, ms_stereo, sfreq, single)) return (MP3_ERR); } else { granules = 2; #ifdef MPEG1 if (III_get_side_info_1(mp, &sideinfo, stereo, ms_stereo, sfreq, single)) return (MP3_ERR); #else debug_printf("%d Not supported\n", __LINE__); #endif } if (set_pointer(mp, sideinfo.main_data_begin) == MP3_ERR) return 0; for (gr = 0; gr < granules; gr++) { static real hybridIn[2][SBLIMIT][SSLIMIT]; static real hybridOut[2][SSLIMIT][SBLIMIT]; { struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]); long part2bits; if (fr->lsf) part2bits = III_get_scale_factors_2(mp, scalefacs, gr_info, 0); else { #ifdef MPEG1 part2bits = III_get_scale_factors_1(mp, scalefacs, gr_info); #else debug_printf("%d Not supported\n", __LINE__); #endif } if (III_dequantize_sample(mp, hybridIn[0], scalefacs, gr_info, sfreq, part2bits)) return (MP3_ERR); } if (stereo == 2) { struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]); long part2bits; if (fr->lsf) part2bits = III_get_scale_factors_2(mp, scalefacs, gr_info, i_stereo); else { #ifdef MPEG1 part2bits = III_get_scale_factors_1(mp, scalefacs, gr_info); #else debug_printf("%d Not supported\n", __LINE__); #endif } if (III_dequantize_sample(mp, hybridIn[1], scalefacs, gr_info, sfreq, part2bits)) return (MP3_ERR); if (ms_stereo) { int i; for (i = 0; i < SBLIMIT * SSLIMIT; i++) { real tmp0, tmp1; tmp0 = ((real *) hybridIn[0])[i]; tmp1 = ((real *) hybridIn[1])[i]; ((real *) hybridIn[1])[i] = tmp0 - tmp1; ((real *) hybridIn[0])[i] = tmp0 + tmp1; } } if (i_stereo) III_i_stereo(hybridIn, scalefacs, gr_info, sfreq, ms_stereo, fr->lsf); if (ms_stereo || i_stereo || (single == 3)) { if (gr_info->maxb > sideinfo.ch[0].gr[gr].maxb) sideinfo.ch[0].gr[gr].maxb = gr_info->maxb; else gr_info->maxb = sideinfo.ch[0].gr[gr].maxb; } switch (single) { case 3: { register int i; register real *in0 = (real *) hybridIn[0], *in1 = (real *) hybridIn[1]; for (i = 0; i < SSLIMIT * gr_info->maxb; i++, in0++) *in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */ } break; case 1: { register int i; register real *in0 = (real *) hybridIn[0], *in1 = (real *) hybridIn[1]; for (i = 0; i < SSLIMIT * gr_info->maxb; i++) *in0++ = *in1++; } break; } } for (ch = 0; ch < stereo1; ch++) { struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]); III_antialias(hybridIn[ch], gr_info); III_hybrid(mp, hybridIn[ch], hybridOut[ch], ch, gr_info); } for (ss = 0; ss < SSLIMIT; ss++) { if (single >= 0) { clip += synth_ntom_mono(mp, hybridOut[0][ss], pcm_sample, pcm_point); } else { int p1 = *pcm_point; clip += synth_ntom(mp, hybridOut[0][ss], 0, pcm_sample, &p1); clip += synth_ntom(mp, hybridOut[1][ss], 1, pcm_sample, pcm_point); } } } return 0; }