149 lines
4.5 KiB
C
149 lines
4.5 KiB
C
/*
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* LVF demuxer
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* Copyright (c) 2012 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 "riff.h"
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static int lvf_probe(AVProbeData *p)
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{
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if (AV_RL32(p->buf) == MKTAG('L', 'V', 'F', 'F'))
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return AVPROBE_SCORE_MAX / 2;
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return 0;
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}
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static int lvf_read_header(AVFormatContext *s)
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{
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AVStream *st;
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int64_t next_offset;
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unsigned size, nb_streams, id;
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avio_skip(s->pb, 16);
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nb_streams = avio_rl32(s->pb);
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if (!nb_streams)
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return AVERROR_INVALIDDATA;
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if (nb_streams > 2) {
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av_log_ask_for_sample(s, "too many streams\n");
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return AVERROR_PATCHWELCOME;
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}
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avio_skip(s->pb, 1012);
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while (!url_feof(s->pb)) {
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id = avio_rl32(s->pb);
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size = avio_rl32(s->pb);
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next_offset = avio_tell(s->pb) + size;
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switch (id) {
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case MKTAG('0', '0', 'f', 'm'):
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st = avformat_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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avio_skip(s->pb, 4);
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st->codec->width = avio_rl32(s->pb);
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st->codec->height = avio_rl32(s->pb);
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avio_skip(s->pb, 4);
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st->codec->codec_tag = avio_rl32(s->pb);
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st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
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st->codec->codec_tag);
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avpriv_set_pts_info(st, 32, 1, 1000);
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break;
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case MKTAG('0', '1', 'f', 'm'):
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st = avformat_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_tag = avio_rl16(s->pb);
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st->codec->channels = avio_rl16(s->pb);
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st->codec->sample_rate = avio_rl16(s->pb);
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avio_skip(s->pb, 8);
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st->codec->bits_per_coded_sample = avio_r8(s->pb);
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st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags,
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st->codec->codec_tag);
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avpriv_set_pts_info(st, 32, 1, 1000);
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break;
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case 0:
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avio_seek(s->pb, 2048 + 8, SEEK_SET);
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return 0;
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default:
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av_log_ask_for_sample(s, "unknown id\n");
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return AVERROR_PATCHWELCOME;
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}
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avio_seek(s->pb, next_offset, SEEK_SET);
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}
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return AVERROR_EOF;
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}
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static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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unsigned size, flags, timestamp, id;
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int64_t pos;
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int ret, is_video = 0;
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pos = avio_tell(s->pb);
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while (!url_feof(s->pb)) {
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id = avio_rl32(s->pb);
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size = avio_rl32(s->pb);
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if (size == 0xFFFFFFFFu)
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return AVERROR_EOF;
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switch (id) {
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case MKTAG('0', '0', 'd', 'c'):
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is_video = 1;
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case MKTAG('0', '1', 'w', 'b'):
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if (size < 8)
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return AVERROR_INVALIDDATA;
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timestamp = avio_rl32(s->pb);
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flags = avio_rl32(s->pb);
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ret = av_get_packet(s->pb, pkt, size - 8);
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if (flags & (1 << 12))
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->stream_index = is_video ? 0 : 1;
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pkt->pts = timestamp;
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pkt->pos = pos;
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return ret;
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default:
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ret = avio_skip(s->pb, size);
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}
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if (ret < 0)
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return ret;
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}
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return AVERROR_EOF;
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}
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AVInputFormat ff_lvf_demuxer = {
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.name = "lvf",
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.long_name = NULL_IF_CONFIG_SMALL("LVF"),
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.read_probe = lvf_probe,
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.read_header = lvf_read_header,
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.read_packet = lvf_read_packet,
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.extensions = "lvf",
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.flags = AVFMT_GENERIC_INDEX,
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};
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