diff options
Diffstat (limited to 'libavformat/lvfdec.c')
| -rw-r--r-- | libavformat/lvfdec.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libavformat/lvfdec.c b/libavformat/lvfdec.c new file mode 100644 index 0000000000..81aec599ba --- /dev/null +++ b/libavformat/lvfdec.c @@ -0,0 +1,152 @@ +/* + * LVF demuxer + * Copyright (c) 2012 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "riff.h" + +static int lvf_probe(AVProbeData *p) +{ + if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F')) + return 0; + + if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256) + return AVPROBE_SCORE_MAX / 8; + + return AVPROBE_SCORE_EXTENSION; +} + +static int lvf_read_header(AVFormatContext *s) +{ + AVStream *st; + int64_t next_offset; + unsigned size, nb_streams, id; + + avio_skip(s->pb, 16); + nb_streams = avio_rl32(s->pb); + if (!nb_streams) + return AVERROR_INVALIDDATA; + if (nb_streams > 2) { + avpriv_request_sample(s, "%d streams", nb_streams); + return AVERROR_PATCHWELCOME; + } + + avio_skip(s->pb, 1012); + + while (!avio_feof(s->pb)) { + id = avio_rl32(s->pb); + size = avio_rl32(s->pb); + next_offset = avio_tell(s->pb) + size; + + switch (id) { + case MKTAG('0', '0', 'f', 'm'): + st = avformat_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + avio_skip(s->pb, 4); + st->codec->width = avio_rl32(s->pb); + st->codec->height = avio_rl32(s->pb); + avio_skip(s->pb, 4); + st->codec->codec_tag = avio_rl32(s->pb); + st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, + st->codec->codec_tag); + avpriv_set_pts_info(st, 32, 1, 1000); + break; + case MKTAG('0', '1', 'f', 'm'): + st = avformat_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_tag = avio_rl16(s->pb); + st->codec->channels = avio_rl16(s->pb); + st->codec->sample_rate = avio_rl16(s->pb); + avio_skip(s->pb, 8); + st->codec->bits_per_coded_sample = avio_r8(s->pb); + st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, + st->codec->codec_tag); + avpriv_set_pts_info(st, 32, 1, 1000); + break; + case 0: + avio_seek(s->pb, 2048 + 8, SEEK_SET); + return 0; + default: + avpriv_request_sample(s, "id %d", id); + return AVERROR_PATCHWELCOME; + } + + avio_seek(s->pb, next_offset, SEEK_SET); + } + + return AVERROR_EOF; +} + +static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + unsigned size, flags, timestamp, id; + int64_t pos; + int ret, is_video = 0; + + pos = avio_tell(s->pb); + while (!avio_feof(s->pb)) { + id = avio_rl32(s->pb); + size = avio_rl32(s->pb); + + if (size == 0xFFFFFFFFu) + return AVERROR_EOF; + + switch (id) { + case MKTAG('0', '0', 'd', 'c'): + is_video = 1; + case MKTAG('0', '1', 'w', 'b'): + if (size < 8) + return AVERROR_INVALIDDATA; + timestamp = avio_rl32(s->pb); + flags = avio_rl32(s->pb); + ret = av_get_packet(s->pb, pkt, size - 8); + if (flags & (1 << 12)) + pkt->flags |= AV_PKT_FLAG_KEY; + pkt->stream_index = is_video ? 0 : 1; + pkt->pts = timestamp; + pkt->pos = pos; + return ret; + default: + ret = avio_skip(s->pb, size); + } + + if (ret < 0) + return ret; + } + + return AVERROR_EOF; +} + +AVInputFormat ff_lvf_demuxer = { + .name = "lvf", + .long_name = NULL_IF_CONFIG_SMALL("LVF"), + .read_probe = lvf_probe, + .read_header = lvf_read_header, + .read_packet = lvf_read_packet, + .extensions = "lvf", + .flags = AVFMT_GENERIC_INDEX, +}; |