/* * RAW MPEG-4 video demuxer * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 & 0xfffffe00) continue; if (temp_buffer < 2) continue; if (temp_buffer == VOP_START_CODE) VOP++; else if (temp_buffer == VISUAL_OBJECT_START_CODE) VISO++; else if (temp_buffer >= 0x100 && temp_buffer < 0x120) VO++; else if (temp_buffer >= 0x120 && 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 AVPROBE_SCORE_EXTENSION; return 0; } FF_DEF_RAWVIDEO_DEMUXER(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", AV_CODEC_ID_MPEG4)