| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * AAC decoder | ||
| 3 | * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org ) | ||
| 4 | * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com ) | ||
| 5 | * Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com> | ||
| 6 | * | ||
| 7 | * AAC LATM decoder | ||
| 8 | * Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz> | ||
| 9 | * Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net> | ||
| 10 | * | ||
| 11 | * AAC decoder fixed-point implementation | ||
| 12 | * Copyright (c) 2013 | ||
| 13 | * MIPS Technologies, Inc., California. | ||
| 14 | * | ||
| 15 | * This file is part of FFmpeg. | ||
| 16 | * | ||
| 17 | * FFmpeg is free software; you can redistribute it and/or | ||
| 18 | * modify it under the terms of the GNU Lesser General Public | ||
| 19 | * License as published by the Free Software Foundation; either | ||
| 20 | * version 2.1 of the License, or (at your option) any later version. | ||
| 21 | * | ||
| 22 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 25 | * Lesser General Public License for more details. | ||
| 26 | * | ||
| 27 | * You should have received a copy of the GNU Lesser General Public | ||
| 28 | * License along with FFmpeg; if not, write to the Free Software | ||
| 29 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 30 | */ | ||
| 31 | |||
| 32 | #ifndef AVCODEC_AAC_AACDEC_FIXED_COUPLING_H | ||
| 33 | #define AVCODEC_AAC_AACDEC_FIXED_COUPLING_H | ||
| 34 | |||
| 35 | #include "aacdec.h" | ||
| 36 | |||
| 37 | /** | ||
| 38 | * Apply dependent channel coupling (applied before IMDCT). | ||
| 39 | * | ||
| 40 | * @param index index into coupling gain array | ||
| 41 | */ | ||
| 42 | ✗ | static void AAC_RENAME(apply_dependent_coupling)(AACDecContext *ac, | |
| 43 | SingleChannelElement *target, | ||
| 44 | ChannelElement *cce, int index) | ||
| 45 | { | ||
| 46 | ✗ | IndividualChannelStream *ics = &cce->ch[0].ics; | |
| 47 | ✗ | const uint16_t *offsets = ics->swb_offset; | |
| 48 | ✗ | int *dest = target->coeffs_fixed; | |
| 49 | ✗ | const int *src = cce->ch[0].coeffs_fixed; | |
| 50 | ✗ | int g, i, group, k, idx = 0; | |
| 51 | ✗ | if (ac->oc[1].m4ac.object_type == AOT_AAC_LTP) { | |
| 52 | ✗ | av_log(ac->avctx, AV_LOG_ERROR, | |
| 53 | "Dependent coupling is not supported together with LTP\n"); | ||
| 54 | ✗ | return; | |
| 55 | } | ||
| 56 | ✗ | for (g = 0; g < ics->num_window_groups; g++) { | |
| 57 | ✗ | for (i = 0; i < ics->max_sfb; i++, idx++) { | |
| 58 | ✗ | if (cce->ch[0].band_type[idx] != ZERO_BT) { | |
| 59 | ✗ | const int gain = cce->coup.gain[index][idx]; | |
| 60 | int shift, round, c, tmp; | ||
| 61 | |||
| 62 | ✗ | if (gain < 0) { | |
| 63 | ✗ | c = -cce_scale_fixed[-gain & 7]; | |
| 64 | ✗ | shift = (-gain-1024) >> 3; | |
| 65 | } | ||
| 66 | else { | ||
| 67 | ✗ | c = cce_scale_fixed[gain & 7]; | |
| 68 | ✗ | shift = (gain-1024) >> 3; | |
| 69 | } | ||
| 70 | |||
| 71 | ✗ | if (shift < -31) { | |
| 72 | // Nothing to do | ||
| 73 | ✗ | } else if (shift < 0) { | |
| 74 | ✗ | shift = -shift; | |
| 75 | ✗ | round = 1 << (shift - 1); | |
| 76 | |||
| 77 | ✗ | for (group = 0; group < ics->group_len[g]; group++) { | |
| 78 | ✗ | for (k = offsets[i]; k < offsets[i + 1]; k++) { | |
| 79 | ✗ | tmp = (int)(((int64_t)src[group * 128 + k] * c + \ | |
| 80 | ✗ | (int64_t)0x1000000000) >> 37); | |
| 81 | ✗ | dest[group * 128 + k] += (tmp + (int64_t)round) >> shift; | |
| 82 | } | ||
| 83 | } | ||
| 84 | } | ||
| 85 | else { | ||
| 86 | ✗ | for (group = 0; group < ics->group_len[g]; group++) { | |
| 87 | ✗ | for (k = offsets[i]; k < offsets[i + 1]; k++) { | |
| 88 | ✗ | tmp = (int)(((int64_t)src[group * 128 + k] * c + \ | |
| 89 | ✗ | (int64_t)0x1000000000) >> 37); | |
| 90 | ✗ | dest[group * 128 + k] += tmp * (1U << shift); | |
| 91 | } | ||
| 92 | } | ||
| 93 | } | ||
| 94 | } | ||
| 95 | } | ||
| 96 | ✗ | dest += ics->group_len[g] * 128; | |
| 97 | ✗ | src += ics->group_len[g] * 128; | |
| 98 | } | ||
| 99 | } | ||
| 100 | |||
| 101 | /** | ||
| 102 | * Apply independent channel coupling (applied after IMDCT). | ||
| 103 | * | ||
| 104 | * @param index index into coupling gain array | ||
| 105 | */ | ||
| 106 | 650 | static void AAC_RENAME(apply_independent_coupling)(AACDecContext *ac, | |
| 107 | SingleChannelElement *target, | ||
| 108 | ChannelElement *cce, int index) | ||
| 109 | { | ||
| 110 | int i, c, shift, round, tmp; | ||
| 111 | 650 | const int gain = cce->coup.gain[index][0]; | |
| 112 | 650 | const int *src = cce->ch[0].output_fixed; | |
| 113 | 650 | unsigned int *dest = target->output_fixed; | |
| 114 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 650 times.
|
650 | const int len = 1024 << (ac->oc[1].m4ac.sbr == 1); |
| 115 | |||
| 116 | 650 | c = cce_scale_fixed[gain & 7]; | |
| 117 | 650 | shift = (gain-1024) >> 3; | |
| 118 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 650 times.
|
650 | if (shift < -31) { |
| 119 | ✗ | return; | |
| 120 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 650 times.
|
650 | } else if (shift < 0) { |
| 121 | ✗ | shift = -shift; | |
| 122 | ✗ | round = 1 << (shift - 1); | |
| 123 | |||
| 124 | ✗ | for (i = 0; i < len; i++) { | |
| 125 | ✗ | tmp = (int)(((int64_t)src[i] * c + (int64_t)0x1000000000) >> 37); | |
| 126 | ✗ | dest[i] += (tmp + round) >> shift; | |
| 127 | } | ||
| 128 | } | ||
| 129 | else { | ||
| 130 |
2/2✓ Branch 0 taken 665600 times.
✓ Branch 1 taken 650 times.
|
666250 | for (i = 0; i < len; i++) { |
| 131 | 665600 | tmp = (int)(((int64_t)src[i] * c + (int64_t)0x1000000000) >> 37); | |
| 132 | 665600 | dest[i] += tmp * (1U << shift); | |
| 133 | } | ||
| 134 | } | ||
| 135 | } | ||
| 136 | |||
| 137 | #endif /* AVCODEC_AAC_AACDEC_FIXED_COUPLING_H */ | ||
| 138 |