mirror of https://git.videolan.org/git/ffmpeg.git
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/*
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* Bonk demuxer
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* Copyright (c) 2016 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avio_internal.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#include "id3v2.h"
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#include "rawdec.h"
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static int bonk_probe(const AVProbeData *p)
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{
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for (int i = 0; i < p->buf_size - 22; i++) {
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if (!p->buf[i] && AV_RL32(p->buf + i + 1) == MKTAG('B','O','N','K')) {
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if (p->buf[i + 5])
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return 0;
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if (AV_RL32(p->buf + i + 6) == 0)
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return 0;
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if (AV_RL32(p->buf + i + 10) == 0)
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return 0;
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if (p->buf[i + 14] == 0)
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return 0;
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if (AV_RL16(p->buf + i + 17) == 0 ||
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AV_RL16(p->buf + i + 17) > 2048)
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return 0;
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if (p->buf[i + 19] == 0)
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return 0;
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if (AV_RL16(p->buf + i + 20) == 0)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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}
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return 0;
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}
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static int bonk_read_header(AVFormatContext *s)
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{
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ID3v2ExtraMeta *extra_meta;
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AVStream *st;
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int ret;
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while (!avio_feof(s->pb)) {
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const int b = avio_r8(s->pb);
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if (!b) {
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uint32_t t;
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int ret = ffio_ensure_seekback(s->pb, 3);
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if (ret < 0)
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return ret;
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t = avio_rl32(s->pb);
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if (t == MKTAG('B','O','N','K')) {
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break;
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} else if (t == MKTAG(' ','I','D','3')) {
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avio_seek(s->pb, -3, SEEK_CUR);
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ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &extra_meta, 0);
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if (extra_meta) {
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ff_id3v2_parse_apic(s, extra_meta);
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ff_id3v2_parse_priv(s, extra_meta);
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ff_id3v2_free_extra_meta(&extra_meta);
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}
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avio_skip(s->pb, 8);
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} else {
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return AVERROR_INVALIDDATA;
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}
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}
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}
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 17)) < 0)
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return ret;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_BONK;
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st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 5);
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st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[9];
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if (st->codecpar->ch_layout.nb_channels == 0)
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return AVERROR_INVALIDDATA;
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st->duration = AV_RL32(st->codecpar->extradata + 1) / st->codecpar->ch_layout.nb_channels;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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const FFInputFormat ff_bonk_demuxer = {
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.p.name = "bonk",
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.p.long_name = NULL_IF_CONFIG_SMALL("raw Bonk"),
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.p.extensions = "bonk",
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.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
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.p.priv_class = &ff_raw_demuxer_class,
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.read_probe = bonk_probe,
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.read_header = bonk_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.raw_codec_id = AV_CODEC_ID_BONK,
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.priv_data_size = sizeof(FFRawDemuxerContext),
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};
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