90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
|
/*
|
||
|
|
* DC STR demuxer
|
||
|
|
* Copyright (c) 2015 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 "avformat.h"
|
||
|
|
#include "internal.h"
|
||
|
|
|
||
|
|
static int dcstr_probe(const AVProbeData *p)
|
||
|
|
{
|
||
|
|
if (p->buf_size < 224 || memcmp(p->buf + 213, "Sega Stream", 11))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return AVPROBE_SCORE_MAX;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dcstr_read_header(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
unsigned codec, align;
|
||
|
|
int mult;
|
||
|
|
AVStream *st;
|
||
|
|
|
||
|
|
st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
||
|
|
st->codecpar->channels = avio_rl32(s->pb);
|
||
|
|
st->codecpar->sample_rate = avio_rl32(s->pb);
|
||
|
|
if (st->codecpar->sample_rate <= 0)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
codec = avio_rl32(s->pb);
|
||
|
|
align = avio_rl32(s->pb);
|
||
|
|
avio_skip(s->pb, 4);
|
||
|
|
st->duration = avio_rl32(s->pb);
|
||
|
|
mult = avio_rl32(s->pb);
|
||
|
|
if (st->codecpar->channels <= 0 || mult <= 0 || mult > INT_MAX / st->codecpar->channels) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "invalid number of channels %d x %d\n", st->codecpar->channels, mult);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
st->codecpar->channels *= mult;
|
||
|
|
if (!align || align > INT_MAX / st->codecpar->channels)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
st->codecpar->block_align = align * st->codecpar->channels;
|
||
|
|
|
||
|
|
switch (codec) {
|
||
|
|
case 4: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
|
||
|
|
case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
|
||
|
|
default: avpriv_request_sample(s, "codec %X", codec);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
|
||
|
|
avio_skip(s->pb, 0x800 - avio_tell(s->pb));
|
||
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dcstr_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
||
|
|
return av_get_packet(s->pb, pkt, par->block_align);
|
||
|
|
}
|
||
|
|
|
||
|
|
AVInputFormat ff_dcstr_demuxer = {
|
||
|
|
.name = "dcstr",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Sega DC STR"),
|
||
|
|
.read_probe = dcstr_probe,
|
||
|
|
.read_header = dcstr_read_header,
|
||
|
|
.read_packet = dcstr_read_packet,
|
||
|
|
.extensions = "str",
|
||
|
|
.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH,
|
||
|
|
};
|