2 * RAW Chinese AVS video demuxer
3 * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de>
5 * This file is part of FFmpeg.
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.
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.
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
25 #define CAVS_SEQ_START_CODE 0x000001b0
26 #define CAVS_PIC_I_START_CODE 0x000001b3
27 #define CAVS_UNDEF_START_CODE 0x000001b4
28 #define CAVS_PIC_PB_START_CODE 0x000001b6
29 #define CAVS_VIDEO_EDIT_CODE 0x000001b7
30 #define CAVS_PROFILE_JIZHUN 0x20
32 static int cavsvideo_probe(AVProbeData *p)
35 int pic=0, seq=0, slice_pos = 0;
38 for(i=0; i<p->buf_size; i++){
39 code = (code<<8) + p->buf[i];
40 if ((code & 0xffffff00) == 0x100) {
41 if(code < CAVS_SEQ_START_CODE) {
42 /* slices have to be consecutive */
49 if (code == CAVS_SEQ_START_CODE) {
51 /* check for the only currently supported profile */
52 if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
54 } else if ((code == CAVS_PIC_I_START_CODE) ||
55 (code == CAVS_PIC_PB_START_CODE)) {
57 } else if ((code == CAVS_UNDEF_START_CODE) ||
58 (code > CAVS_VIDEO_EDIT_CODE)) {
63 if(seq && seq*9<=pic*10)
64 return AVPROBE_SCORE_MAX/2;
68 FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, CODEC_ID_CAVS)