/* * RAW Chinese AVS video demuxer * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> * * 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 CAVS_SEQ_START_CODE 0x000001b0 #define CAVS_PIC_I_START_CODE 0x000001b3 #define CAVS_UNDEF_START_CODE 0x000001b4 #define CAVS_PIC_PB_START_CODE 0x000001b6 #define CAVS_VIDEO_EDIT_CODE 0x000001b7 #define CAVS_PROFILE_JIZHUN 0x20 static int cavsvideo_probe(AVProbeData *p) { uint32_t code= -1; int pic=0, seq=0, slice_pos = 0; int i; for(i=0; i<p->buf_size; i++){ code = (code<<8) + p->buf[i]; if ((code & 0xffffff00) == 0x100) { if(code < CAVS_SEQ_START_CODE) { /* slices have to be consecutive */ if(code < slice_pos) return 0; slice_pos = code; } else { slice_pos = 0; } if (code == CAVS_SEQ_START_CODE) { seq++; /* check for the only currently supported profile */ if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) return 0; } else if ((code == CAVS_PIC_I_START_CODE) || (code == CAVS_PIC_PB_START_CODE)) { pic++; } else if ((code == CAVS_UNDEF_START_CODE) || (code > CAVS_VIDEO_EDIT_CODE)) { return 0; } } } if(seq && seq*9<=pic*10) return AVPROBE_SCORE_MAX/2; return 0; } FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS video", cavsvideo_probe, NULL, CODEC_ID_CAVS)