repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * RAW MPEG-4 video demuxer | |
| 3 | * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com> | |
| 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 | ||
| 25 | #define VISUAL_OBJECT_START_CODE 0x000001b5 | |
| 26 | #define VOP_START_CODE 0x000001b6 | |
| 27 | ||
| 28 | static int mpeg4video_probe(AVProbeData *probe_packet) | |
| 29 | { | |
| f6fa7814 DM |
30 | uint32_t temp_buffer = -1; |
| 31 | int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0; | |
| 2ba45a60 DM |
32 | int i; |
| 33 | ||
| f6fa7814 DM |
34 | for (i = 0; i < probe_packet->buf_size; i++) { |
| 35 | temp_buffer = (temp_buffer << 8) + probe_packet->buf[i]; | |
| 2ba45a60 DM |
36 | if (temp_buffer & 0xfffffe00) |
| 37 | continue; | |
| 38 | if (temp_buffer < 2) | |
| 39 | continue; | |
| 40 | ||
| f6fa7814 DM |
41 | if (temp_buffer == VOP_START_CODE) |
| 42 | VOP++; | |
| 43 | else if (temp_buffer == VISUAL_OBJECT_START_CODE) | |
| 44 | VISO++; | |
| 45 | else if (temp_buffer >= 0x100 && temp_buffer < 0x120) | |
| 46 | VO++; | |
| 47 | else if (temp_buffer >= 0x120 && temp_buffer < 0x130) | |
| 48 | VOL++; | |
| 49 | else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) && | |
| 50 | !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) | |
| 51 | res++; | |
| 2ba45a60 DM |
52 | } |
| 53 | ||
| f6fa7814 | 54 | if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0) |
| 2ba45a60 DM |
55 | return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2; |
| 56 | return 0; | |
| 57 | } | |
| 58 | ||
| f6fa7814 DM |
59 | FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", |
| 60 | AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT) |