1 /*
2 * TAK common code
3 * Copyright (c) 2012 Paul B Mahol
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
24
25 #define BITSTREAM_READER_LE
26 #include "tak.h"
27
28 static const int64_t tak_channel_layouts[] = {
29 0,
30 AV_CH_FRONT_LEFT,
31 AV_CH_FRONT_RIGHT,
32 AV_CH_FRONT_CENTER,
33 AV_CH_LOW_FREQUENCY,
34 AV_CH_BACK_LEFT,
35 AV_CH_BACK_RIGHT,
36 AV_CH_FRONT_LEFT_OF_CENTER,
37 AV_CH_FRONT_RIGHT_OF_CENTER,
38 AV_CH_BACK_CENTER,
39 AV_CH_SIDE_LEFT,
40 AV_CH_SIDE_RIGHT,
41 AV_CH_TOP_CENTER,
42 AV_CH_TOP_FRONT_LEFT,
43 AV_CH_TOP_FRONT_CENTER,
44 AV_CH_TOP_FRONT_RIGHT,
45 AV_CH_TOP_BACK_LEFT,
46 AV_CH_TOP_BACK_CENTER,
47 AV_CH_TOP_BACK_RIGHT,
48 };
49
50 static const uint16_t frame_duration_type_quants[] = {
51 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
52 };
53
tak_get_nb_samples(int sample_rate,enum TAKFrameSizeType type)54 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
55 {
56 int nb_samples, max_nb_samples;
57
58 if (type <= TAK_FST_250ms) {
59 nb_samples = sample_rate * frame_duration_type_quants[type] >>
60 TAK_FRAME_DURATION_QUANT_SHIFT;
61 max_nb_samples = 16384;
62 } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
63 nb_samples = frame_duration_type_quants[type];
64 max_nb_samples = sample_rate *
65 frame_duration_type_quants[TAK_FST_250ms] >>
66 TAK_FRAME_DURATION_QUANT_SHIFT;
67 } else {
68 return AVERROR_INVALIDDATA;
69 }
70
71 if (nb_samples <= 0 || nb_samples > max_nb_samples)
72 return AVERROR_INVALIDDATA;
73
74 return nb_samples;
75 }
76
ff_tak_check_crc(const uint8_t * buf,unsigned int buf_size)77 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
78 {
79 uint32_t crc, CRC;
80
81 if (buf_size < 4)
82 return AVERROR_INVALIDDATA;
83 buf_size -= 3;
84
85 CRC = AV_RB24(buf + buf_size);
86 crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
87 if (CRC != crc)
88 return AVERROR_INVALIDDATA;
89
90 return 0;
91 }
92
ff_tak_parse_streaminfo(TAKStreamInfo * s,GetBitContext * gb)93 void ff_tak_parse_streaminfo(TAKStreamInfo *s, GetBitContext *gb)
94 {
95 uint64_t channel_mask = 0;
96 int frame_type, i;
97
98 s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
99 skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
100
101 frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
102 s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
103
104 s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
105 s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
106 TAK_SAMPLE_RATE_MIN;
107 s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
108 TAK_BPS_MIN;
109 s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
110 TAK_CHANNELS_MIN;
111
112 if (get_bits1(gb)) {
113 skip_bits(gb, TAK_FORMAT_VALID_BITS);
114 if (get_bits1(gb)) {
115 for (i = 0; i < s->channels; i++) {
116 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
117
118 if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
119 channel_mask |= tak_channel_layouts[value];
120 }
121 }
122 }
123
124 s->ch_layout = channel_mask;
125 s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
126 }
127
avpriv_tak_parse_streaminfo(TAKStreamInfo * s,const uint8_t * buf,int size)128 int avpriv_tak_parse_streaminfo(TAKStreamInfo *s, const uint8_t *buf, int size)
129 {
130 GetBitContext gb;
131 int ret = init_get_bits8(&gb, buf, size);
132
133 if (ret < 0)
134 return AVERROR_INVALIDDATA;
135
136 ff_tak_parse_streaminfo(s, &gb);
137
138 return 0;
139 }
140
ff_tak_decode_frame_header(AVCodecContext * avctx,GetBitContext * gb,TAKStreamInfo * ti,int log_level_offset)141 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
142 TAKStreamInfo *ti, int log_level_offset)
143 {
144 if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
145 av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
146 return AVERROR_INVALIDDATA;
147 }
148
149 ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
150 ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
151
152 if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
153 ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
154 skip_bits(gb, 2);
155 } else {
156 ti->last_frame_samples = 0;
157 }
158
159 if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
160 ff_tak_parse_streaminfo(ti, gb);
161
162 if (get_bits(gb, 6))
163 skip_bits(gb, 25);
164 align_get_bits(gb);
165 }
166
167 if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
168 return AVERROR_INVALIDDATA;
169
170 skip_bits(gb, 24);
171
172 return 0;
173 }
174