| /* |
| * RAW MPEG-4 video demuxer |
| * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com> |
| * |
| * 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 "avformat.h" |
| #include "rawdec.h" |
| |
| #define VISUAL_OBJECT_START_CODE 0x000001b5 |
| #define VOP_START_CODE 0x000001b6 |
| |
| static int mpeg4video_probe(AVProbeData *probe_packet) |
| { |
| uint32_t temp_buffer= -1; |
| int VO=0, VOL=0, VOP = 0, VISO = 0, res=0; |
| int i; |
| |
| for(i=0; i<probe_packet->buf_size; i++){ |
| temp_buffer = (temp_buffer<<8) + probe_packet->buf[i]; |
| if ((temp_buffer & 0xffffff00) != 0x100) |
| continue; |
| |
| if (temp_buffer == VOP_START_CODE) VOP++; |
| else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++; |
| else if (temp_buffer < 0x120) VO++; |
| else if (temp_buffer < 0x130) VOL++; |
| else if ( !(0x1AF < temp_buffer && temp_buffer < 0x1B7) |
| && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++; |
| } |
| |
| if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0) |
| return VOP+VO > 3 ? AVPROBE_SCORE_MAX/2 : AVPROBE_SCORE_MAX/4; |
| return 0; |
| } |
| |
| FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video format", mpeg4video_probe, "m4v", CODEC_ID_MPEG4) |
