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117 lines
3.8 KiB
117 lines
3.8 KiB
/* |
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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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