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2ba45a60 DM |
1 | /* |
2 | * RAW Chinese AVS video demuxer | |
3 | * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include "avformat.h" | |
23 | #include "rawdec.h" | |
24 | ||
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 | |
31 | ||
32 | static int cavsvideo_probe(AVProbeData *p) | |
33 | { | |
34 | uint32_t code= -1; | |
35 | int pic=0, seq=0, slice_pos = 0; | |
36 | int i; | |
37 | ||
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 */ | |
43 | if(code < slice_pos) | |
44 | return 0; | |
45 | slice_pos = code; | |
46 | } else { | |
47 | slice_pos = 0; | |
48 | } | |
49 | if (code == CAVS_SEQ_START_CODE) { | |
50 | seq++; | |
51 | /* check for the only currently supported profile */ | |
52 | if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) | |
53 | return 0; | |
54 | } else if ((code == CAVS_PIC_I_START_CODE) || | |
55 | (code == CAVS_PIC_PB_START_CODE)) { | |
56 | pic++; | |
57 | } else if ((code == CAVS_UNDEF_START_CODE) || | |
58 | (code > CAVS_VIDEO_EDIT_CODE)) { | |
59 | return 0; | |
60 | } | |
61 | } | |
62 | } | |
63 | if(seq && seq*9<=pic*10) | |
64 | return AVPROBE_SCORE_EXTENSION+1; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS) |