| 1 | /* |
| 2 | * LVF demuxer |
| 3 | * Copyright (c) 2012 Paul B Mahol |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | #include "avformat.h" |
| 24 | #include "riff.h" |
| 25 | |
| 26 | static int lvf_probe(AVProbeData *p) |
| 27 | { |
| 28 | if (AV_RL32(p->buf) != MKTAG('L', 'V', 'F', 'F')) |
| 29 | return 0; |
| 30 | |
| 31 | if (!AV_RL32(p->buf + 16) || AV_RL32(p->buf + 16) > 256) |
| 32 | return AVPROBE_SCORE_MAX / 8; |
| 33 | |
| 34 | return AVPROBE_SCORE_EXTENSION; |
| 35 | } |
| 36 | |
| 37 | static int lvf_read_header(AVFormatContext *s) |
| 38 | { |
| 39 | AVStream *st; |
| 40 | int64_t next_offset; |
| 41 | unsigned size, nb_streams, id; |
| 42 | |
| 43 | avio_skip(s->pb, 16); |
| 44 | nb_streams = avio_rl32(s->pb); |
| 45 | if (!nb_streams) |
| 46 | return AVERROR_INVALIDDATA; |
| 47 | if (nb_streams > 2) { |
| 48 | avpriv_request_sample(s, "%d streams", nb_streams); |
| 49 | return AVERROR_PATCHWELCOME; |
| 50 | } |
| 51 | |
| 52 | avio_skip(s->pb, 1012); |
| 53 | |
| 54 | while (!avio_feof(s->pb)) { |
| 55 | id = avio_rl32(s->pb); |
| 56 | size = avio_rl32(s->pb); |
| 57 | next_offset = avio_tell(s->pb) + size; |
| 58 | |
| 59 | switch (id) { |
| 60 | case MKTAG('0', '0', 'f', 'm'): |
| 61 | st = avformat_new_stream(s, 0); |
| 62 | if (!st) |
| 63 | return AVERROR(ENOMEM); |
| 64 | |
| 65 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 66 | avio_skip(s->pb, 4); |
| 67 | st->codec->width = avio_rl32(s->pb); |
| 68 | st->codec->height = avio_rl32(s->pb); |
| 69 | avio_skip(s->pb, 4); |
| 70 | st->codec->codec_tag = avio_rl32(s->pb); |
| 71 | st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
| 72 | st->codec->codec_tag); |
| 73 | avpriv_set_pts_info(st, 32, 1, 1000); |
| 74 | break; |
| 75 | case MKTAG('0', '1', 'f', 'm'): |
| 76 | st = avformat_new_stream(s, 0); |
| 77 | if (!st) |
| 78 | return AVERROR(ENOMEM); |
| 79 | |
| 80 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 81 | st->codec->codec_tag = avio_rl16(s->pb); |
| 82 | st->codec->channels = avio_rl16(s->pb); |
| 83 | st->codec->sample_rate = avio_rl16(s->pb); |
| 84 | avio_skip(s->pb, 8); |
| 85 | st->codec->bits_per_coded_sample = avio_r8(s->pb); |
| 86 | st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, |
| 87 | st->codec->codec_tag); |
| 88 | avpriv_set_pts_info(st, 32, 1, 1000); |
| 89 | break; |
| 90 | case 0: |
| 91 | avio_seek(s->pb, 2048 + 8, SEEK_SET); |
| 92 | return 0; |
| 93 | default: |
| 94 | avpriv_request_sample(s, "id %d", id); |
| 95 | return AVERROR_PATCHWELCOME; |
| 96 | } |
| 97 | |
| 98 | avio_seek(s->pb, next_offset, SEEK_SET); |
| 99 | } |
| 100 | |
| 101 | return AVERROR_EOF; |
| 102 | } |
| 103 | |
| 104 | static int lvf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 105 | { |
| 106 | unsigned size, flags, timestamp, id; |
| 107 | int64_t pos; |
| 108 | int ret, is_video = 0; |
| 109 | |
| 110 | pos = avio_tell(s->pb); |
| 111 | while (!avio_feof(s->pb)) { |
| 112 | id = avio_rl32(s->pb); |
| 113 | size = avio_rl32(s->pb); |
| 114 | |
| 115 | if (size == 0xFFFFFFFFu) |
| 116 | return AVERROR_EOF; |
| 117 | |
| 118 | switch (id) { |
| 119 | case MKTAG('0', '0', 'd', 'c'): |
| 120 | is_video = 1; |
| 121 | case MKTAG('0', '1', 'w', 'b'): |
| 122 | if (size < 8) |
| 123 | return AVERROR_INVALIDDATA; |
| 124 | timestamp = avio_rl32(s->pb); |
| 125 | flags = avio_rl32(s->pb); |
| 126 | ret = av_get_packet(s->pb, pkt, size - 8); |
| 127 | if (flags & (1 << 12)) |
| 128 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 129 | pkt->stream_index = is_video ? 0 : 1; |
| 130 | pkt->pts = timestamp; |
| 131 | pkt->pos = pos; |
| 132 | return ret; |
| 133 | default: |
| 134 | ret = avio_skip(s->pb, size); |
| 135 | } |
| 136 | |
| 137 | if (ret < 0) |
| 138 | return ret; |
| 139 | } |
| 140 | |
| 141 | return AVERROR_EOF; |
| 142 | } |
| 143 | |
| 144 | AVInputFormat ff_lvf_demuxer = { |
| 145 | .name = "lvf", |
| 146 | .long_name = NULL_IF_CONFIG_SMALL("LVF"), |
| 147 | .read_probe = lvf_probe, |
| 148 | .read_header = lvf_read_header, |
| 149 | .read_packet = lvf_read_packet, |
| 150 | .extensions = "lvf", |
| 151 | .flags = AVFMT_GENERIC_INDEX, |
| 152 | }; |