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2ba45a60 DM |
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 | #include "tak.h" | |
25 | ||
26 | static const int64_t tak_channel_layouts[] = { | |
27 | 0, | |
28 | AV_CH_FRONT_LEFT, | |
29 | AV_CH_FRONT_RIGHT, | |
30 | AV_CH_FRONT_CENTER, | |
31 | AV_CH_LOW_FREQUENCY, | |
32 | AV_CH_BACK_LEFT, | |
33 | AV_CH_BACK_RIGHT, | |
34 | AV_CH_FRONT_LEFT_OF_CENTER, | |
35 | AV_CH_FRONT_RIGHT_OF_CENTER, | |
36 | AV_CH_BACK_CENTER, | |
37 | AV_CH_SIDE_LEFT, | |
38 | AV_CH_SIDE_RIGHT, | |
39 | AV_CH_TOP_CENTER, | |
40 | AV_CH_TOP_FRONT_LEFT, | |
41 | AV_CH_TOP_FRONT_CENTER, | |
42 | AV_CH_TOP_FRONT_RIGHT, | |
43 | AV_CH_TOP_BACK_LEFT, | |
44 | AV_CH_TOP_BACK_CENTER, | |
45 | AV_CH_TOP_BACK_RIGHT, | |
46 | }; | |
47 | ||
48 | static const uint16_t frame_duration_type_quants[] = { | |
49 | 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048, | |
50 | }; | |
51 | ||
52 | static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type) | |
53 | { | |
54 | int nb_samples, max_nb_samples; | |
55 | ||
56 | if (type <= TAK_FST_250ms) { | |
57 | nb_samples = sample_rate * frame_duration_type_quants[type] >> | |
58 | TAK_FRAME_DURATION_QUANT_SHIFT; | |
59 | max_nb_samples = 16384; | |
60 | } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) { | |
61 | nb_samples = frame_duration_type_quants[type]; | |
62 | max_nb_samples = sample_rate * | |
63 | frame_duration_type_quants[TAK_FST_250ms] >> | |
64 | TAK_FRAME_DURATION_QUANT_SHIFT; | |
65 | } else { | |
66 | return AVERROR_INVALIDDATA; | |
67 | } | |
68 | ||
69 | if (nb_samples <= 0 || nb_samples > max_nb_samples) | |
70 | return AVERROR_INVALIDDATA; | |
71 | ||
72 | return nb_samples; | |
73 | } | |
74 | ||
75 | int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size) | |
76 | { | |
77 | uint32_t crc, CRC; | |
78 | ||
79 | if (buf_size < 4) | |
80 | return AVERROR_INVALIDDATA; | |
81 | buf_size -= 3; | |
82 | ||
83 | CRC = AV_RB24(buf + buf_size); | |
84 | crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size); | |
85 | if (CRC != crc) | |
86 | return AVERROR_INVALIDDATA; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s) | |
92 | { | |
93 | uint64_t channel_mask = 0; | |
94 | int frame_type, i; | |
95 | ||
96 | s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS); | |
97 | skip_bits(gb, TAK_ENCODER_PROFILE_BITS); | |
98 | ||
99 | frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS); | |
100 | s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS); | |
101 | ||
102 | s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS); | |
103 | s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) + | |
104 | TAK_SAMPLE_RATE_MIN; | |
105 | s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) + | |
106 | TAK_BPS_MIN; | |
107 | s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) + | |
108 | TAK_CHANNELS_MIN; | |
109 | ||
110 | if (get_bits1(gb)) { | |
111 | skip_bits(gb, TAK_FORMAT_VALID_BITS); | |
112 | if (get_bits1(gb)) { | |
113 | for (i = 0; i < s->channels; i++) { | |
114 | int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS); | |
115 | ||
116 | if (value < FF_ARRAY_ELEMS(tak_channel_layouts)) | |
117 | channel_mask |= tak_channel_layouts[value]; | |
118 | } | |
119 | } | |
120 | } | |
121 | ||
122 | s->ch_layout = channel_mask; | |
123 | s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type); | |
124 | } | |
125 | ||
126 | int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, | |
127 | TAKStreamInfo *ti, int log_level_offset) | |
128 | { | |
129 | if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) { | |
130 | av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n"); | |
131 | return AVERROR_INVALIDDATA; | |
132 | } | |
133 | ||
134 | ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS); | |
135 | ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS); | |
136 | ||
137 | if (ti->flags & TAK_FRAME_FLAG_IS_LAST) { | |
138 | ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1; | |
139 | skip_bits(gb, 2); | |
140 | } else { | |
141 | ti->last_frame_samples = 0; | |
142 | } | |
143 | ||
144 | if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) { | |
145 | avpriv_tak_parse_streaminfo(gb, ti); | |
146 | ||
147 | if (get_bits(gb, 6)) | |
148 | skip_bits(gb, 25); | |
149 | align_get_bits(gb); | |
150 | } | |
151 | ||
152 | if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA) | |
153 | return AVERROR_INVALIDDATA; | |
154 | ||
155 | skip_bits(gb, 24); | |
156 | ||
157 | return 0; | |
158 | } |