Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: stable
Fetching contributors…

Cannot retrieve contributors at this time

212 lines (183 sloc) 6.584 kb
/*
* Raw TAK demuxer
* 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 "libavcodec/tak.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "rawdec.h"
#include "apetag.h"
typedef struct TAKDemuxContext {
int mlast_frame;
int64_t data_end;
} TAKDemuxContext;
static int tak_probe(AVProbeData *p)
{
if (!memcmp(p->buf, "tBaK", 4))
return AVPROBE_SCORE_EXTENSION;
return 0;
}
static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
unsigned int len)
{
return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len);
}
static int tak_read_header(AVFormatContext *s)
{
TAKDemuxContext *tc = s->priv_data;
AVIOContext *pb = s->pb;
GetBitContext gb;
AVStream *st;
uint8_t *buffer = NULL;
int ret;
st = avformat_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = AV_CODEC_ID_TAK;
st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
tc->mlast_frame = 0;
if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
avio_seek(pb, -4, SEEK_CUR);
return 0;
}
while (!avio_feof(pb)) {
enum TAKMetaDataType type;
int size;
type = avio_r8(pb) & 0x7f;
size = avio_rl24(pb);
switch (type) {
case TAK_METADATA_STREAMINFO:
case TAK_METADATA_LAST_FRAME:
case TAK_METADATA_ENCODER:
if (size <= 3)
return AVERROR_INVALIDDATA;
buffer = av_malloc(size - 3 + FF_INPUT_BUFFER_PADDING_SIZE);
if (!buffer)
return AVERROR(ENOMEM);
memset(buffer + size - 3, 0, FF_INPUT_BUFFER_PADDING_SIZE);
ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
if (avio_read(pb, buffer, size - 3) != size - 3) {
av_freep(&buffer);
return AVERROR(EIO);
}
if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
if (s->error_recognition & AV_EF_EXPLODE) {
av_freep(&buffer);
return AVERROR_INVALIDDATA;
}
}
init_get_bits8(&gb, buffer, size - 3);
break;
case TAK_METADATA_MD5: {
uint8_t md5[16];
int i;
if (size != 19)
return AVERROR_INVALIDDATA;
ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
avio_read(pb, md5, 16);
if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
if (s->error_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
av_log(s, AV_LOG_VERBOSE, "MD5=");
for (i = 0; i < 16; i++)
av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
av_log(s, AV_LOG_VERBOSE, "\n");
break;
}
case TAK_METADATA_END: {
int64_t curpos = avio_tell(pb);
if (pb->seekable) {
ff_ape_parse_tag(s);
avio_seek(pb, curpos, SEEK_SET);
}
tc->data_end += curpos;
return 0;
}
default:
ret = avio_skip(pb, size);
if (ret < 0)
return ret;
}
if (type == TAK_METADATA_STREAMINFO) {
TAKStreamInfo ti;
avpriv_tak_parse_streaminfo(&gb, &ti);
if (ti.samples > 0)
st->duration = ti.samples;
st->codec->bits_per_coded_sample = ti.bps;
if (ti.ch_layout)
st->codec->channel_layout = ti.ch_layout;
st->codec->sample_rate = ti.sample_rate;
st->codec->channels = ti.channels;
st->start_time = 0;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
st->codec->extradata = buffer;
st->codec->extradata_size = size - 3;
buffer = NULL;
} else if (type == TAK_METADATA_LAST_FRAME) {
if (size != 11)
return AVERROR_INVALIDDATA;
tc->mlast_frame = 1;
tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS);
av_freep(&buffer);
} else if (type == TAK_METADATA_ENCODER) {
av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
get_bits_long(&gb, TAK_ENCODER_VERSION_BITS));
av_freep(&buffer);
}
}
return AVERROR_EOF;
}
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
TAKDemuxContext *tc = s->priv_data;
int ret;
if (tc->mlast_frame) {
AVIOContext *pb = s->pb;
int64_t size, left;
left = tc->data_end - avio_tell(pb);
size = FFMIN(left, 1024);
if (size <= 0)
return AVERROR_EOF;
ret = av_get_packet(pb, pkt, size);
if (ret < 0)
return ret;
pkt->stream_index = 0;
} else {
ret = ff_raw_read_partial_packet(s, pkt);
}
return ret;
}
AVInputFormat ff_tak_demuxer = {
.name = "tak",
.long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
.priv_data_size = sizeof(TAKDemuxContext),
.read_probe = tak_probe,
.read_header = tak_read_header,
.read_packet = raw_read_packet,
.flags = AVFMT_GENERIC_INDEX,
.extensions = "tak",
.raw_codec_id = AV_CODEC_ID_TAK,
};
Jump to Line
Something went wrong with that request. Please try again.