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 | { | |
| 30 | uint32_t temp_buffer= -1; | |
| 31 | int VO=0, VOL=0, VOP = 0, VISO = 0, res=0; | |
| 32 | int i; | |
| 33 | ||
| 34 | for(i=0; i<probe_packet->buf_size; i++){ | |
| 35 | temp_buffer = (temp_buffer<<8) + probe_packet->buf[i]; | |
| 36 | if (temp_buffer & 0xfffffe00) | |
| 37 | continue; | |
| 38 | if (temp_buffer < 2) | |
| 39 | continue; | |
| 40 | ||
| 41 | if (temp_buffer == VOP_START_CODE) VOP++; | |
| 42 | else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++; | |
| 43 | else if (temp_buffer >= 0x100 && temp_buffer < 0x120) VO++; | |
| 44 | else if (temp_buffer >= 0x120 && temp_buffer < 0x130) VOL++; | |
| 45 | else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7) | |
| 46 | && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++; | |
| 47 | } | |
| 48 | ||
| 49 | if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0) | |
| 50 | return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2; | |
| 51 | return 0; | |
| 52 | } | |
| 53 | ||
| 54 | FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", AV_CODEC_ID_MPEG4) |