1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * RAW H.263 video demuxer 3cabdff1aSopenharmony_ci * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at> 4cabdff1aSopenharmony_ci * 5cabdff1aSopenharmony_ci * This file is part of FFmpeg. 6cabdff1aSopenharmony_ci * 7cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 8cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 9cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 10cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 11cabdff1aSopenharmony_ci * 12cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 13cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 14cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15cabdff1aSopenharmony_ci * Lesser General Public License for more details. 16cabdff1aSopenharmony_ci * 17cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 18cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 19cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20cabdff1aSopenharmony_ci */ 21cabdff1aSopenharmony_ci 22cabdff1aSopenharmony_ci#include "avformat.h" 23cabdff1aSopenharmony_ci#include "rawdec.h" 24cabdff1aSopenharmony_ci 25cabdff1aSopenharmony_cistatic int h263_probe(const AVProbeData *p) 26cabdff1aSopenharmony_ci{ 27cabdff1aSopenharmony_ci uint64_t code= -1; 28cabdff1aSopenharmony_ci int i; 29cabdff1aSopenharmony_ci int valid_psc=0; 30cabdff1aSopenharmony_ci int invalid_psc=0; 31cabdff1aSopenharmony_ci int res_change=0; 32cabdff1aSopenharmony_ci int src_fmt, last_src_fmt=-1; 33cabdff1aSopenharmony_ci int last_gn=0; 34cabdff1aSopenharmony_ci int tr, last_tr = -1; 35cabdff1aSopenharmony_ci 36cabdff1aSopenharmony_ci for(i=0; i<p->buf_size; i++){ 37cabdff1aSopenharmony_ci code = (code<<8) + p->buf[i]; 38cabdff1aSopenharmony_ci if ((code & 0xfffffc000000) == 0x80000000) { 39cabdff1aSopenharmony_ci tr = (code >> 18) & 0xFF; 40cabdff1aSopenharmony_ci src_fmt= (code>>10)&7; 41cabdff1aSopenharmony_ci if( src_fmt != last_src_fmt 42cabdff1aSopenharmony_ci && last_src_fmt>0 && last_src_fmt<6 43cabdff1aSopenharmony_ci && src_fmt<6) 44cabdff1aSopenharmony_ci res_change++; 45cabdff1aSopenharmony_ci 46cabdff1aSopenharmony_ci if (tr == last_tr) { 47cabdff1aSopenharmony_ci invalid_psc++; 48cabdff1aSopenharmony_ci continue; 49cabdff1aSopenharmony_ci } 50cabdff1aSopenharmony_ci 51cabdff1aSopenharmony_ci if (src_fmt != 7 && !(code&(1<<9)) && (code&(1<<5))) { 52cabdff1aSopenharmony_ci invalid_psc++; 53cabdff1aSopenharmony_ci continue; 54cabdff1aSopenharmony_ci } 55cabdff1aSopenharmony_ci 56cabdff1aSopenharmony_ci if((code&0x30000)==0x20000 && src_fmt){ 57cabdff1aSopenharmony_ci valid_psc++; 58cabdff1aSopenharmony_ci last_gn=0; 59cabdff1aSopenharmony_ci }else 60cabdff1aSopenharmony_ci invalid_psc++; 61cabdff1aSopenharmony_ci last_src_fmt= src_fmt; 62cabdff1aSopenharmony_ci last_tr = tr; 63cabdff1aSopenharmony_ci } else if((code & 0xffff80000000) == 0x80000000) { 64cabdff1aSopenharmony_ci int gn= (code>>(31-5)) & 0x1F; 65cabdff1aSopenharmony_ci if(gn<last_gn){ 66cabdff1aSopenharmony_ci invalid_psc++; 67cabdff1aSopenharmony_ci }else 68cabdff1aSopenharmony_ci last_gn= gn; 69cabdff1aSopenharmony_ci } 70cabdff1aSopenharmony_ci } 71cabdff1aSopenharmony_ci if(valid_psc > 2*invalid_psc + 2*res_change + 3){ 72cabdff1aSopenharmony_ci return AVPROBE_SCORE_EXTENSION; 73cabdff1aSopenharmony_ci }else if(valid_psc > 2*invalid_psc) 74cabdff1aSopenharmony_ci return AVPROBE_SCORE_EXTENSION / 2; 75cabdff1aSopenharmony_ci return 0; 76cabdff1aSopenharmony_ci} 77cabdff1aSopenharmony_ci 78cabdff1aSopenharmony_ciFF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, AV_CODEC_ID_H263) 79