yading@11: /*
yading@11:  * LVF demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "riff.h"
yading@11: 
yading@11: static int lvf_probe(AVProbeData *p)
yading@11: {
yading@11:     if (AV_RL32(p->buf) == MKTAG('L', 'V', 'F', 'F'))
yading@11:         return AVPROBE_SCORE_MAX / 2;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int lvf_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVStream *st;
yading@11:     int64_t next_offset;
yading@11:     unsigned size, nb_streams, id;
yading@11: 
yading@11:     avio_skip(s->pb, 16);
yading@11:     nb_streams = avio_rl32(s->pb);
yading@11:     if (!nb_streams)
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     if (nb_streams > 2) {
yading@11:         avpriv_request_sample(s, "%d streams", nb_streams);
yading@11:         return AVERROR_PATCHWELCOME;
yading@11:     }
yading@11: 
yading@11:     avio_skip(s->pb, 1012);
yading@11: 
yading@11:     while (!url_feof(s->pb)) {
yading@11:         id          = avio_rl32(s->pb);
yading@11:         size        = avio_rl32(s->pb);
yading@11:         next_offset = avio_tell(s->pb) + size;
yading@11: 
yading@11:         switch (id) {
yading@11:         case MKTAG('0', '0', 'f', 'm'):
yading@11:             st = avformat_new_stream(s, 0);
yading@11:             if (!st)
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:             avio_skip(s->pb, 4);
yading@11:             st->codec->width      = avio_rl32(s->pb);
yading@11:             st->codec->height     = avio_rl32(s->pb);
yading@11:             avio_skip(s->pb, 4);
yading@11:             st->codec->codec_tag  = avio_rl32(s->pb);
yading@11:             st->codec->codec_id   = ff_codec_get_id(ff_codec_bmp_tags,
yading@11:                                                     st->codec->codec_tag);
yading@11:             avpriv_set_pts_info(st, 32, 1, 1000);
yading@11:             break;
yading@11:         case MKTAG('0', '1', 'f', 'm'):
yading@11:             st = avformat_new_stream(s, 0);
yading@11:             if (!st)
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:             st->codec->codec_tag   = avio_rl16(s->pb);
yading@11:             st->codec->channels    = avio_rl16(s->pb);
yading@11:             st->codec->sample_rate = avio_rl16(s->pb);
yading@11:             avio_skip(s->pb, 8);
yading@11:             st->codec->bits_per_coded_sample = avio_r8(s->pb);
yading@11:             st->codec->codec_id    = ff_codec_get_id(ff_codec_wav_tags,
yading@11:                                                      st->codec->codec_tag);
yading@11:             avpriv_set_pts_info(st, 32, 1, 1000);
yading@11:             break;
yading@11:         case 0:
yading@11:             avio_seek(s->pb, 2048 + 8, SEEK_SET);
yading@11:             return 0;
yading@11:         default:
yading@11:             avpriv_request_sample(s, "id %d", id);
yading@11:             return AVERROR_PATCHWELCOME;
yading@11:         }
yading@11: 
yading@11:         avio_seek(s->pb, next_offset, SEEK_SET);
yading@11:     }
yading@11: 
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     unsigned size, flags, timestamp, id;
yading@11:     int64_t pos;
yading@11:     int ret, is_video = 0;
yading@11: 
yading@11:     pos = avio_tell(s->pb);
yading@11:     while (!url_feof(s->pb)) {
yading@11:         id    = avio_rl32(s->pb);
yading@11:         size  = avio_rl32(s->pb);
yading@11: 
yading@11:         if (size == 0xFFFFFFFFu)
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         switch (id) {
yading@11:         case MKTAG('0', '0', 'd', 'c'):
yading@11:             is_video = 1;
yading@11:         case MKTAG('0', '1', 'w', 'b'):
yading@11:             if (size < 8)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             timestamp = avio_rl32(s->pb);
yading@11:             flags = avio_rl32(s->pb);
yading@11:             ret = av_get_packet(s->pb, pkt, size - 8);
yading@11:             if (flags & (1 << 12))
yading@11:                 pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:             pkt->stream_index = is_video ? 0 : 1;
yading@11:             pkt->pts          = timestamp;
yading@11:             pkt->pos          = pos;
yading@11:             return ret;
yading@11:         default:
yading@11:             ret = avio_skip(s->pb, size);
yading@11:         }
yading@11: 
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11:     }
yading@11: 
yading@11:     return AVERROR_EOF;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_lvf_demuxer = {
yading@11:     .name        = "lvf",
yading@11:     .long_name   = NULL_IF_CONFIG_SMALL("LVF"),
yading@11:     .read_probe  = lvf_probe,
yading@11:     .read_header = lvf_read_header,
yading@11:     .read_packet = lvf_read_packet,
yading@11:     .extensions  = "lvf",
yading@11:     .flags       = AVFMT_GENERIC_INDEX,
yading@11: };