FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/h263dec.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 38 39 97.4%
Functions: 1 1 100.0%
Branches: 31 32 96.9%

Line Branch Exec Source
1 /*
2 * RAW H.263 video demuxer
3 * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
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 6782 static int h263_probe(const AVProbeData *p)
26 {
27 6782 uint64_t code= -1;
28 int i;
29 6782 int valid_psc=0;
30 6782 int invalid_psc=0;
31 6782 int res_change=0;
32 6782 int src_fmt, last_src_fmt=-1;
33 6782 int last_gn=0;
34 6782 int tr, last_tr = -1;
35
36
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139396066 for(i=0; i<p->buf_size; i++){
37 139389284 code = (code<<8) + p->buf[i];
38
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139389284 if ((code & 0xfffffc000000) == 0x80000000) {
39 11124 tr = (code >> 18) & 0xFF;
40 11124 src_fmt= (code>>10)&7;
41
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11124 if( src_fmt != last_src_fmt
42
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4740 && last_src_fmt>0 && last_src_fmt<6
43
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1723 && src_fmt<6)
44 1093 res_change++;
45
46
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11124 if (tr == last_tr) {
47 4234 invalid_psc++;
48 4234 continue;
49 }
50
51
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6890 if (src_fmt != 7 && !(code&(1<<9)) && (code&(1<<5))) {
52 497 invalid_psc++;
53 497 continue;
54 }
55
56
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6393 if((code&0x30000)==0x20000 && src_fmt){
57 330 valid_psc++;
58 330 last_gn=0;
59 }else
60 6063 invalid_psc++;
61 6393 last_src_fmt= src_fmt;
62 6393 last_tr = tr;
63
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139378160 } else if((code & 0xffff80000000) == 0x80000000) {
64 582105 int gn= (code>>(31-5)) & 0x1F;
65
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582105 if(gn<last_gn){
66 138883 invalid_psc++;
67 }else
68 443222 last_gn= gn;
69 }
70 }
71
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6782 if(valid_psc > 2*invalid_psc + 2*res_change + 3){
72 return AVPROBE_SCORE_EXTENSION;
73
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6782 }else if(valid_psc > 2*invalid_psc)
74 178 return AVPROBE_SCORE_EXTENSION / 2;
75 6604 return 0;
76 }
77
78 FF_DEF_RAWVIDEO_DEMUXER(h263, "raw H.263", h263_probe, NULL, AV_CODEC_ID_H263)
79