blob: c0ba61e81f9cff9f90a205ca79e3917316271406
| 1 | /* |
| 2 | * RAW Ingenient MJPEG demuxer |
| 3 | * Copyright (c) 2005 Alex Beregszaszi |
| 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 "avformat.h" |
| 23 | #include "rawdec.h" |
| 24 | #include "libavutil/intreadwrite.h" |
| 25 | |
| 26 | // http://multimedia.cx/ingenient.txt |
| 27 | static int ingenient_probe(AVProbeData *p) |
| 28 | { |
| 29 | if ( AV_RN32(p->buf) != AV_RN32("MJPG") |
| 30 | || p->buf_size < 50 |
| 31 | || AV_RB16(p->buf + 48) != 0xffd8) |
| 32 | return 0; |
| 33 | return AVPROBE_SCORE_MAX * 3 / 4; |
| 34 | } |
| 35 | |
| 36 | static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 37 | { |
| 38 | int ret, size, w, h, unk1, unk2; |
| 39 | |
| 40 | if (avio_rl32(s->pb) != MKTAG('M', 'J', 'P', 'G')) |
| 41 | return AVERROR(EIO); // FIXME |
| 42 | |
| 43 | size = avio_rl32(s->pb); |
| 44 | |
| 45 | w = avio_rl16(s->pb); |
| 46 | h = avio_rl16(s->pb); |
| 47 | |
| 48 | avio_skip(s->pb, 8); // zero + size (padded?) |
| 49 | avio_skip(s->pb, 2); |
| 50 | unk1 = avio_rl16(s->pb); |
| 51 | unk2 = avio_rl16(s->pb); |
| 52 | avio_skip(s->pb, 22); // ASCII timestamp |
| 53 | |
| 54 | av_log(s, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n", |
| 55 | size, w, h, unk1, unk2); |
| 56 | |
| 57 | ret = av_get_packet(s->pb, pkt, size); |
| 58 | if (ret < 0) |
| 59 | return ret; |
| 60 | pkt->stream_index = 0; |
| 61 | return ret; |
| 62 | } |
| 63 | |
| 64 | FF_RAWVIDEO_DEMUXER_CLASS(ingenient) |
| 65 | |
| 66 | AVInputFormat ff_ingenient_demuxer = { |
| 67 | .name = "ingenient", |
| 68 | .long_name = NULL_IF_CONFIG_SMALL("raw Ingenient MJPEG"), |
| 69 | .priv_data_size = sizeof(FFRawVideoDemuxerContext), |
| 70 | .read_probe = ingenient_probe, |
| 71 | .read_header = ff_raw_video_read_header, |
| 72 | .read_packet = ingenient_read_packet, |
| 73 | .flags = AVFMT_GENERIC_INDEX, |
| 74 | .extensions = "cgi", // FIXME |
| 75 | .raw_codec_id = AV_CODEC_ID_MJPEG, |
| 76 | .priv_class = &ingenient_demuxer_class, |
| 77 | }; |
| 78 |