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/*
* Raw DTS-HD 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/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavcodec/dca.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#define AUPR_HDR 0x415550522D484452
#define AUPRINFO 0x41555052494E464F
#define BITSHVTB 0x4249545348565442
#define BLACKOUT 0x424C41434B4F5554
#define BRANCHPT 0x4252414E43485054
#define BUILDVER 0x4255494C44564552
#define CORESSMD 0x434F524553534D44
#define DTSHDHDR 0x4454534844484452
#define EXTSS_MD 0x45585453535f4d44
#define FILEINFO 0x46494C45494E464F
#define NAVI_TBL 0x4E4156492D54424C
#define STRMDATA 0x5354524D44415441
#define TIMECODE 0x54494D45434F4445
typedef struct DTSHDDemuxContext {
uint64_t data_end;
} DTSHDDemuxContext;
static int dtshd_probe(const AVProbeData *p)
{
if (AV_RB64(p->buf) == DTSHDHDR)
return AVPROBE_SCORE_MAX;
return 0;
}
static int dtshd_read_header(AVFormatContext *s)
{
DTSHDDemuxContext *dtshd = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t chunk_type, chunk_size;
int64_t duration, orig_nb_samples, data_start;
AVStream *st;
int ret;
char *value;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_DTS;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
for (;;) {
chunk_type = avio_rb64(pb);
chunk_size = avio_rb64(pb);
if (avio_feof(pb))
break;
if (chunk_size < 4) {
av_log(s, AV_LOG_ERROR, "chunk size too small\n");
return AVERROR_INVALIDDATA;
}
if (chunk_size > ((uint64_t)1 << 61)) {
av_log(s, AV_LOG_ERROR, "chunk size too big\n");
return AVERROR_INVALIDDATA;
}
switch (chunk_type) {
case STRMDATA:
data_start = avio_tell(pb);
dtshd->data_end = data_start + chunk_size;
if (dtshd->data_end <= chunk_size)
return AVERROR_INVALIDDATA;
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
goto break_loop;
goto skip;
break;
case AUPR_HDR:
if (chunk_size < 21)
return AVERROR_INVALIDDATA;
avio_skip(pb, 3);
st->codecpar->sample_rate = avio_rb24(pb);
if (!st->codecpar->sample_rate)
return AVERROR_INVALIDDATA;
duration = avio_rb32(pb); // num_frames
duration *= avio_rb16(pb); // samples_per_frames
st->duration = duration;
orig_nb_samples = avio_rb32(pb);
orig_nb_samples <<= 8;
orig_nb_samples |= avio_r8(pb);
st->codecpar->ch_layout.nb_channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
st->codecpar->initial_padding = avio_rb16(pb);
st->codecpar->trailing_padding = FFMAX(st->duration - orig_nb_samples - st->codecpar->initial_padding, 0);
avio_skip(pb, chunk_size - 21);
break;
case FILEINFO:
if (chunk_size > INT_MAX)
goto skip;
value = av_malloc(chunk_size);
if (!value)
goto skip;
avio_read(pb, value, chunk_size);
value[chunk_size - 1] = 0;
av_dict_set(&s->metadata, "fileinfo", value,
AV_DICT_DONT_STRDUP_VAL);
break;
default:
skip:
ret = avio_skip(pb, chunk_size);
if (ret < 0)
return ret;
};
}
if (!dtshd->data_end)
return AVERROR_EOF;
avio_seek(pb, data_start, SEEK_SET);
break_loop:
if (st->codecpar->sample_rate)
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DTSHDDemuxContext *dtshd = s->priv_data;
int64_t size, left;
int ret;
left = dtshd->data_end - avio_tell(s->pb);
size = FFMIN(left, 1024);
if (size <= 0)
return AVERROR_EOF;
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
pkt->stream_index = 0;
return ret;
}
const FFInputFormat ff_dtshd_demuxer = {
.p.name = "dtshd",
.p.long_name = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.extensions = "dtshd",
.priv_data_size = sizeof(DTSHDDemuxContext),
.read_probe = dtshd_probe,
.read_header = dtshd_read_header,
.read_packet = raw_read_packet,
.raw_codec_id = AV_CODEC_ID_DTS,
};
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