FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/aac/aacdec_fixed_coupling.h
Date: 2024-07-16 12:46:59
Exec Total Coverage
Lines: 12 52 23.1%
Functions: 1 2 50.0%
Branches: 5 32 15.6%

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
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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
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650 if (shift < -31) {
119 return;
120
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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
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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