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/*
* Bonk demuxer
* Copyright (c) 2016 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 "avio_internal.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "id3v2.h"
#include "rawdec.h"
static int bonk_probe(const AVProbeData *p)
{
for (int i = 0; i < p->buf_size - 22; i++) {
if (!p->buf[i] && AV_RL32(p->buf + i + 1) == MKTAG('B','O','N','K')) {
if (p->buf[i + 5])
return 0;
if (AV_RL32(p->buf + i + 6) == 0)
return 0;
if (AV_RL32(p->buf + i + 10) == 0)
return 0;
if (p->buf[i + 14] == 0)
return 0;
if (AV_RL16(p->buf + i + 17) == 0 ||
AV_RL16(p->buf + i + 17) > 2048)
return 0;
if (p->buf[i + 19] == 0)
return 0;
if (AV_RL16(p->buf + i + 20) == 0)
return 0;
return AVPROBE_SCORE_MAX;
}
}
return 0;
}
static int bonk_read_header(AVFormatContext *s)
{
ID3v2ExtraMeta *extra_meta;
AVStream *st;
int ret;
while (!avio_feof(s->pb)) {
const int b = avio_r8(s->pb);
if (!b) {
uint32_t t;
int ret = ffio_ensure_seekback(s->pb, 3);
if (ret < 0)
return ret;
t = avio_rl32(s->pb);
if (t == MKTAG('B','O','N','K')) {
break;
} else if (t == MKTAG(' ','I','D','3')) {
avio_seek(s->pb, -3, SEEK_CUR);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &extra_meta, 0);
if (extra_meta) {
ff_id3v2_parse_apic(s, extra_meta);
ff_id3v2_parse_priv(s, extra_meta);
ff_id3v2_free_extra_meta(&extra_meta);
}
avio_skip(s->pb, 8);
} else {
return AVERROR_INVALIDDATA;
}
}
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 17)) < 0)
return ret;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_BONK;
st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 5);
st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[9];
if (st->codecpar->ch_layout.nb_channels == 0)
return AVERROR_INVALIDDATA;
st->duration = AV_RL32(st->codecpar->extradata + 1) / st->codecpar->ch_layout.nb_channels;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
const FFInputFormat ff_bonk_demuxer = {
.p.name = "bonk",
.p.long_name = NULL_IF_CONFIG_SMALL("raw Bonk"),
.p.extensions = "bonk",
.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
.p.priv_class = &ff_raw_demuxer_class,
.read_probe = bonk_probe,
.read_header = bonk_read_header,
.read_packet = ff_raw_read_partial_packet,
.raw_codec_id = AV_CODEC_ID_BONK,
.priv_data_size = sizeof(FFRawDemuxerContext),
};
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