FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/dca.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 48 76 63.2%
Branches: 14 36 38.9%

Line Branch Exec Source
1 /*
2 * DCA compatible decoder data
3 * Copyright (C) 2004 Gildas Bazin
4 * Copyright (C) 2004 Benjamin Zores
5 * Copyright (C) 2006 Benjamin Larsson
6 * Copyright (C) 2007 Konstantin Shishkov
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include <stdint.h>
26 #include <string.h>
27
28 #include "libavutil/error.h"
29
30 #include "dca.h"
31 #include "dca_core.h"
32 #include "dca_syncwords.h"
33 #include "get_bits.h"
34 #include "put_bits.h"
35
36 const uint32_t avpriv_dca_sample_rates[16] = {
37 0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
38 12000, 24000, 48000, 96000, 192000
39 };
40
41 const uint32_t ff_dca_sampling_freqs[16] = {
42 8000, 16000, 32000, 64000, 128000, 22050, 44100, 88200,
43 176400, 352800, 12000, 24000, 48000, 96000, 192000, 384000,
44 };
45
46 const uint8_t ff_dca_freq_ranges[16] = {
47 0, 1, 2, 3, 4, 1, 2, 3, 4, 4, 0, 1, 2, 3, 4, 4
48 };
49
50 const uint8_t ff_dca_bits_per_sample[8] = {
51 16, 16, 20, 20, 0, 24, 24, 0
52 };
53
54 4519 int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
55 int max_size)
56 {
57 uint32_t mrk;
58 int i, tmp;
59 PutBitContext pb;
60
61
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4519 if ((unsigned) src_size > (unsigned) max_size)
62 src_size = max_size;
63
64 4519 mrk = AV_RB32(src);
65
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4519 switch (mrk) {
66 4519 case DCA_SYNCWORD_CORE_BE:
67 case DCA_SYNCWORD_SUBSTREAM:
68 4519 memcpy(dst, src, src_size);
69 4519 return src_size;
70 case DCA_SYNCWORD_CORE_LE:
71 for (i = 0; i < (src_size + 1) >> 1; i++) {
72 AV_WB16(dst, AV_RL16(src));
73 src += 2;
74 dst += 2;
75 }
76 return src_size;
77 case DCA_SYNCWORD_CORE_14B_BE:
78 case DCA_SYNCWORD_CORE_14B_LE:
79 init_put_bits(&pb, dst, max_size);
80 for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
81 tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
82 put_bits(&pb, 14, tmp);
83 }
84 flush_put_bits(&pb);
85 return put_bytes_output(&pb);
86 default:
87 return AVERROR_INVALIDDATA;
88 }
89 }
90
91 6983 int ff_dca_parse_core_frame_header(DCACoreFrameHeader *h, GetBitContext *gb)
92 {
93
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6983 if (get_bits_long(gb, 32) != DCA_SYNCWORD_CORE_BE)
94 return DCA_PARSE_ERROR_SYNC_WORD;
95
96 6983 h->normal_frame = get_bits1(gb);
97 6983 h->deficit_samples = get_bits(gb, 5) + 1;
98
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6983 if (h->deficit_samples != DCA_PCMBLOCK_SAMPLES)
99 return DCA_PARSE_ERROR_DEFICIT_SAMPLES;
100
101 6983 h->crc_present = get_bits1(gb);
102 6983 h->npcmblocks = get_bits(gb, 7) + 1;
103
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6983 if (h->npcmblocks & (DCA_SUBBAND_SAMPLES - 1))
104 return DCA_PARSE_ERROR_PCM_BLOCKS;
105
106 6983 h->frame_size = get_bits(gb, 14) + 1;
107
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6983 if (h->frame_size < 96)
108 return DCA_PARSE_ERROR_FRAME_SIZE;
109
110 6983 h->audio_mode = get_bits(gb, 6);
111
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6983 if (h->audio_mode >= DCA_AMODE_COUNT)
112 return DCA_PARSE_ERROR_AMODE;
113
114 6983 h->sr_code = get_bits(gb, 4);
115
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6983 if (!avpriv_dca_sample_rates[h->sr_code])
116 return DCA_PARSE_ERROR_SAMPLE_RATE;
117
118 6983 h->br_code = get_bits(gb, 5);
119
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6983 if (get_bits1(gb))
120 return DCA_PARSE_ERROR_RESERVED_BIT;
121
122 6983 h->drc_present = get_bits1(gb);
123 6983 h->ts_present = get_bits1(gb);
124 6983 h->aux_present = get_bits1(gb);
125 6983 h->hdcd_master = get_bits1(gb);
126 6983 h->ext_audio_type = get_bits(gb, 3);
127 6983 h->ext_audio_present = get_bits1(gb);
128 6983 h->sync_ssf = get_bits1(gb);
129 6983 h->lfe_present = get_bits(gb, 2);
130
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6983 if (h->lfe_present == DCA_LFE_FLAG_INVALID)
131 return DCA_PARSE_ERROR_LFE_FLAG;
132
133 6983 h->predictor_history = get_bits1(gb);
134
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6983 if (h->crc_present)
135 skip_bits(gb, 16);
136 6983 h->filter_perfect = get_bits1(gb);
137 6983 h->encoder_rev = get_bits(gb, 4);
138 6983 h->copy_hist = get_bits(gb, 2);
139 6983 h->pcmr_code = get_bits(gb, 3);
140
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6983 if (!ff_dca_bits_per_sample[h->pcmr_code])
141 return DCA_PARSE_ERROR_PCM_RES;
142
143 6983 h->sumdiff_front = get_bits1(gb);
144 6983 h->sumdiff_surround = get_bits1(gb);
145 6983 h->dn_code = get_bits(gb, 4);
146 6983 return 0;
147 }
148
149 4519 int avpriv_dca_parse_core_frame_header(DCACoreFrameHeader *h, const uint8_t *buf, int size)
150 {
151 GetBitContext gb;
152 int ret;
153
154 4519 ret = init_get_bits8(&gb, buf, size);
155
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4519 if (ret < 0)
156 return ret;
157
158
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4519 if (ff_dca_parse_core_frame_header(h, &gb) < 0)
159 return AVERROR_INVALIDDATA;
160
161 4519 return 0;
162 }
163