3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
26 #define BITSTREAM_READER_LE
29 static const uint16_t frame_duration_type_quants[] = {
30 3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
33 static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
35 int nb_samples, max_nb_samples;
37 if (type <= TAK_FST_250ms) {
38 nb_samples = sample_rate * frame_duration_type_quants[type] >>
39 TAK_FRAME_DURATION_QUANT_SHIFT;
40 max_nb_samples = 16384;
41 } else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
42 nb_samples = frame_duration_type_quants[type];
43 max_nb_samples = sample_rate *
44 frame_duration_type_quants[TAK_FST_250ms] >>
45 TAK_FRAME_DURATION_QUANT_SHIFT;
47 return AVERROR_INVALIDDATA;
50 if (nb_samples <= 0 || nb_samples > max_nb_samples)
51 return AVERROR_INVALIDDATA;
56 static int crc_init = 0;
58 #define CRC_TABLE_SIZE 257
60 #define CRC_TABLE_SIZE 1024
62 static AVCRC crc_24[CRC_TABLE_SIZE];
64 av_cold void ff_tak_init_crc(void)
67 av_crc_init(crc_24, 0, 24, 0x864CFBU, sizeof(crc_24));
72 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
77 return AVERROR_INVALIDDATA;
80 CRC = av_bswap32(AV_RL24(buf + buf_size)) >> 8;
81 crc = av_crc(crc_24, 0xCE04B7U, buf, buf_size);
83 return AVERROR_INVALIDDATA;
88 void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
90 uint64_t channel_mask = 0;
93 s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
94 skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
96 frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
97 s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
99 s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
100 s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
102 s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
104 s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
108 skip_bits(gb, TAK_FORMAT_VALID_BITS);
110 for (i = 0; i < s->channels; i++) {
111 int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
113 if (value > 0 && value <= 18)
114 channel_mask |= 1 << (value - 1);
119 s->ch_layout = channel_mask;
120 s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
123 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
124 TAKStreamInfo *ti, int log_level_offset)
126 if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
127 av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
128 return AVERROR_INVALIDDATA;
131 ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
132 ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
134 if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
135 ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
138 ti->last_frame_samples = 0;
141 if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
142 avpriv_tak_parse_streaminfo(gb, ti);