mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
159 lines
4.7 KiB
C
159 lines
4.7 KiB
C
/*
|
|
* TAK common code
|
|
* Copyright (c) 2012 Paul B Mahol
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/crc.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "tak.h"
|
|
|
|
static const int64_t tak_channel_layouts[] = {
|
|
0,
|
|
AV_CH_FRONT_LEFT,
|
|
AV_CH_FRONT_RIGHT,
|
|
AV_CH_FRONT_CENTER,
|
|
AV_CH_LOW_FREQUENCY,
|
|
AV_CH_BACK_LEFT,
|
|
AV_CH_BACK_RIGHT,
|
|
AV_CH_FRONT_LEFT_OF_CENTER,
|
|
AV_CH_FRONT_RIGHT_OF_CENTER,
|
|
AV_CH_BACK_CENTER,
|
|
AV_CH_SIDE_LEFT,
|
|
AV_CH_SIDE_RIGHT,
|
|
AV_CH_TOP_CENTER,
|
|
AV_CH_TOP_FRONT_LEFT,
|
|
AV_CH_TOP_FRONT_CENTER,
|
|
AV_CH_TOP_FRONT_RIGHT,
|
|
AV_CH_TOP_BACK_LEFT,
|
|
AV_CH_TOP_BACK_CENTER,
|
|
AV_CH_TOP_BACK_RIGHT,
|
|
};
|
|
|
|
static const uint16_t frame_duration_type_quants[] = {
|
|
3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
|
|
};
|
|
|
|
static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
|
|
{
|
|
int nb_samples, max_nb_samples;
|
|
|
|
if (type <= TAK_FST_250ms) {
|
|
nb_samples = sample_rate * frame_duration_type_quants[type] >>
|
|
TAK_FRAME_DURATION_QUANT_SHIFT;
|
|
max_nb_samples = 16384;
|
|
} else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
|
|
nb_samples = frame_duration_type_quants[type];
|
|
max_nb_samples = sample_rate *
|
|
frame_duration_type_quants[TAK_FST_250ms] >>
|
|
TAK_FRAME_DURATION_QUANT_SHIFT;
|
|
} else {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (nb_samples <= 0 || nb_samples > max_nb_samples)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
return nb_samples;
|
|
}
|
|
|
|
int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
|
|
{
|
|
uint32_t crc, CRC;
|
|
|
|
if (buf_size < 4)
|
|
return AVERROR_INVALIDDATA;
|
|
buf_size -= 3;
|
|
|
|
CRC = AV_RB24(buf + buf_size);
|
|
crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
|
|
if (CRC != crc)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
|
|
{
|
|
uint64_t channel_mask = 0;
|
|
int frame_type, i;
|
|
|
|
s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
|
|
skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
|
|
|
|
frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
|
|
s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
|
|
|
|
s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
|
|
s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
|
|
TAK_SAMPLE_RATE_MIN;
|
|
s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
|
|
TAK_BPS_MIN;
|
|
s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
|
|
TAK_CHANNELS_MIN;
|
|
|
|
if (get_bits1(gb)) {
|
|
skip_bits(gb, TAK_FORMAT_VALID_BITS);
|
|
if (get_bits1(gb)) {
|
|
for (i = 0; i < s->channels; i++) {
|
|
int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
|
|
|
|
if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
|
|
channel_mask |= tak_channel_layouts[value];
|
|
}
|
|
}
|
|
}
|
|
|
|
s->ch_layout = channel_mask;
|
|
s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
|
|
}
|
|
|
|
int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
|
|
TAKStreamInfo *ti, int log_level_offset)
|
|
{
|
|
if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
|
|
av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
|
|
ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
|
|
|
|
if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
|
|
ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
|
|
skip_bits(gb, 2);
|
|
} else {
|
|
ti->last_frame_samples = 0;
|
|
}
|
|
|
|
if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
|
|
avpriv_tak_parse_streaminfo(gb, ti);
|
|
|
|
if (get_bits(gb, 6))
|
|
skip_bits(gb, 25);
|
|
align_get_bits(gb);
|
|
}
|
|
|
|
if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
skip_bits(gb, 24);
|
|
|
|
return 0;
|
|
}
|