3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/crc.h"
23 #include "libavutil/intreadwrite.h"
26 static const int64_t tak_channel_layouts[] = {
34 AV_CH_FRONT_LEFT_OF_CENTER,
35 AV_CH_FRONT_RIGHT_OF_CENTER,
41 AV_CH_TOP_FRONT_CENTER,
42 AV_CH_TOP_FRONT_RIGHT,
44 AV_CH_TOP_BACK_CENTER,
48 static const uint16_t frame_duration_type_quants[] = {
49 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
52 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
54 int nb_samples, max_nb_samples;
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;
66 return AVERROR_INVALIDDATA;
69 if (nb_samples <= 0 || nb_samples > max_nb_samples)
70 return AVERROR_INVALIDDATA;
75 static int crc_init = 0;
77 #define CRC_TABLE_SIZE 257
79 #define CRC_TABLE_SIZE 1024
81 static AVCRC crc_24[CRC_TABLE_SIZE];
83 av_cold void ff_tak_init_crc(void)
86 av_crc_init(crc_24, 0, 24, 0x864CFBU, sizeof(crc_24));
91 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
96 return AVERROR_INVALIDDATA;
99 CRC = AV_RB24(buf + buf_size);
100 crc = av_crc(crc_24, 0xCE04B7U, buf, buf_size);
102 return AVERROR_INVALIDDATA;
107 void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
109 uint64_t channel_mask = 0;
112 s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
113 skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
115 frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
116 s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
118 s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
119 s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
121 s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
123 s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
127 skip_bits(gb, TAK_FORMAT_VALID_BITS);
129 for (i = 0; i < s->channels; i++) {
130 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
132 if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
133 channel_mask |= tak_channel_layouts[value];
138 s->ch_layout = channel_mask;
139 s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
142 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
143 TAKStreamInfo *ti, int log_level_offset)
145 if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
146 av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
147 return AVERROR_INVALIDDATA;
150 ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
151 ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
153 if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
154 ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
157 ti->last_frame_samples = 0;
160 if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
161 avpriv_tak_parse_streaminfo(gb, ti);
168 if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
169 return AVERROR_INVALIDDATA;