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102 lines
2.7 KiB
102 lines
2.7 KiB
/* |
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* MODS demuxer |
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* Copyright (c) 2015-2016 Florian Nouwt |
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* Copyright (c) 2017 Adib Surani |
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* Copyright (c) 2020 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 "avformat.h" |
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#include "internal.h" |
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static int mods_probe(const AVProbeData *p) |
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{ |
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if (memcmp(p->buf, "MODSN3\x0a\x00", 8)) |
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return 0; |
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if (AV_RB32(p->buf + 8) == 0) |
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return 0; |
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if (AV_RB32(p->buf + 12) == 0) |
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return 0; |
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if (AV_RB32(p->buf + 16) == 0) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int mods_read_header(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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AVRational fps; |
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int64_t pos; |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avio_skip(pb, 8); |
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st->nb_frames = avio_rl32(pb); |
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codecpar->codec_id = AV_CODEC_ID_MOBICLIP; |
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st->codecpar->width = avio_rl32(pb); |
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st->codecpar->height = avio_rl32(pb); |
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fps.num = avio_rl32(pb); |
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fps.den = 0x1000000; |
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avpriv_set_pts_info(st, 64, fps.den, fps.num); |
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avio_skip(pb, 16); |
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pos = avio_rl32(pb) + 4; |
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avio_seek(pb, pos, SEEK_SET); |
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pos = avio_rl32(pb); |
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avio_seek(pb, pos, SEEK_SET); |
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return 0; |
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} |
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static int mods_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVIOContext *pb = s->pb; |
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unsigned size; |
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int64_t pos; |
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int ret; |
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if (avio_feof(pb)) |
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return AVERROR_EOF; |
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pos = avio_tell(pb); |
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size = avio_rl32(pb) >> 14; |
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ret = av_get_packet(pb, pkt, size); |
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pkt->pos = pos; |
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pkt->stream_index = 0; |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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return ret; |
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} |
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const AVInputFormat ff_mods_demuxer = { |
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.name = "mods", |
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.long_name = NULL_IF_CONFIG_SMALL("MobiClip MODS"), |
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.read_probe = mods_probe, |
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.read_header = mods_read_header, |
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.read_packet = mods_read_packet, |
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.extensions = "mods", |
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.flags = AVFMT_GENERIC_INDEX, |
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};
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