159 lines
4.7 KiB
C
159 lines
4.7 KiB
C
/*
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* TAK common code
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "tak.h"
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static const int64_t tak_channel_layouts[] = {
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0,
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AV_CH_FRONT_LEFT,
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AV_CH_FRONT_RIGHT,
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AV_CH_FRONT_CENTER,
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AV_CH_LOW_FREQUENCY,
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AV_CH_BACK_LEFT,
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AV_CH_BACK_RIGHT,
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AV_CH_FRONT_LEFT_OF_CENTER,
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AV_CH_FRONT_RIGHT_OF_CENTER,
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AV_CH_BACK_CENTER,
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AV_CH_SIDE_LEFT,
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AV_CH_SIDE_RIGHT,
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AV_CH_TOP_CENTER,
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AV_CH_TOP_FRONT_LEFT,
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AV_CH_TOP_FRONT_CENTER,
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AV_CH_TOP_FRONT_RIGHT,
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AV_CH_TOP_BACK_LEFT,
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AV_CH_TOP_BACK_CENTER,
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AV_CH_TOP_BACK_RIGHT,
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};
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static const uint16_t frame_duration_type_quants[] = {
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3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
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};
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static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
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{
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int nb_samples, max_nb_samples;
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if (type <= TAK_FST_250ms) {
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nb_samples = sample_rate * frame_duration_type_quants[type] >>
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TAK_FRAME_DURATION_QUANT_SHIFT;
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max_nb_samples = 16384;
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} else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
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nb_samples = frame_duration_type_quants[type];
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max_nb_samples = sample_rate *
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frame_duration_type_quants[TAK_FST_250ms] >>
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TAK_FRAME_DURATION_QUANT_SHIFT;
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} else {
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return AVERROR_INVALIDDATA;
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}
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if (nb_samples <= 0 || nb_samples > max_nb_samples)
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return AVERROR_INVALIDDATA;
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return nb_samples;
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}
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int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
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{
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uint32_t crc, CRC;
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if (buf_size < 4)
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return AVERROR_INVALIDDATA;
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buf_size -= 3;
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CRC = AV_RB24(buf + buf_size);
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crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
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if (CRC != crc)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
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{
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uint64_t channel_mask = 0;
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int frame_type, i;
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s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
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skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
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frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
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s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
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s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
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s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
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TAK_SAMPLE_RATE_MIN;
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s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
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TAK_BPS_MIN;
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s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
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TAK_CHANNELS_MIN;
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if (get_bits1(gb)) {
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skip_bits(gb, TAK_FORMAT_VALID_BITS);
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if (get_bits1(gb)) {
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for (i = 0; i < s->channels; i++) {
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int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
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if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
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channel_mask |= tak_channel_layouts[value];
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}
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}
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}
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s->ch_layout = channel_mask;
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s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
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}
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int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
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TAKStreamInfo *ti, int log_level_offset)
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{
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if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
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av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
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return AVERROR_INVALIDDATA;
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}
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ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
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ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
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if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
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ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
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skip_bits(gb, 2);
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} else {
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ti->last_frame_samples = 0;
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}
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if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
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avpriv_tak_parse_streaminfo(gb, ti);
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if (get_bits(gb, 6))
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skip_bits(gb, 25);
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align_get_bits(gb);
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}
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if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
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return AVERROR_INVALIDDATA;
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skip_bits(gb, 24);
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return 0;
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}
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