FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mjpeg_parser.c
Date: 2025-11-02 07:30:46
Exec Total Coverage
Lines: 48 59 81.4%
Functions: 2 2 100.0%
Branches: 30 46 65.2%
Line Branch Exec Source
1 /*
2 * MJPEG parser
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * MJPEG parser.
27 */
28
29 #include "parser.h"
30 #include "parser_internal.h"
31
32 typedef struct MJPEGParserContext{
33 ParseContext pc;
34 int size;
35 }MJPEGParserContext;
36
37 /**
38 * Find the end of the current frame in the bitstream.
39 * @return the position of the first byte of the next frame, or -1
40 */
41 181 static int find_frame_end(MJPEGParserContext *m, const uint8_t *buf, int buf_size){
42 181 ParseContext *pc= &m->pc;
43 int vop_found, i;
44 uint32_t state;
45
46 181 vop_found= pc->frame_start_found;
47 181 state= pc->state;
48
49 181 i=0;
50
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 181 if(!vop_found){
51
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 40 for(i=0; i<buf_size;){
52 40 state= (state<<8) | buf[i];
53
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 40 if(state>=0xFFC00000 && state<=0xFFFEFFFF){
54
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 10 if(state>=0xFFD8FFC0 && state<=0xFFD8FFFF){
55 10 i++;
56 10 vop_found=1;
57 10 break;
58 ✗ }else if(state<0xFFD00000 || state>0xFFD9FFFF){
59 ✗ m->size= (state&0xFFFF)-1;
60 }
61 }
62
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 30 if(m->size>0){
63 ✗ int size= FFMIN(buf_size-i, m->size);
64 ✗ i+=size;
65 ✗ m->size-=size;
66 ✗ state=0;
67 ✗ continue;
68 }else
69 30 i++;
70 }
71 }
72
73
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 181 if(vop_found){
74 /* EOF considered as end of frame */
75
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 181 if (buf_size == 0)
76 20 return 0;
77
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 622914 for(; i<buf_size;){
78 622753 state= (state<<8) | buf[i];
79
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 60 if(state>=0xFFD8FFC0 && state<=0xFFD8FFFF){
81 ✗ pc->frame_start_found=0;
82 ✗ pc->state=0;
83 ✗ return i-3;
84
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 60 } else if((state>>16)==0xFFD9 && (state&0xFFFF)!=0xFFD8){
85 ✗ state= 0xFFD900|(state&0xFF);
86
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 60 } else if(state<0xFFD00000 || state>0xFFD9FFFF){
87 60 m->size= (state&0xFFFF)-1;
88 }
89 }
90
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 622753 if(m->size>0){
91 60 int size= FFMIN(buf_size-i, m->size);
92 60 i+=size;
93 60 m->size-=size;
94 60 state=0;
95 60 continue;
96 }else
97 622693 i++;
98 }
99 }
100 161 pc->frame_start_found= vop_found;
101 161 pc->state= state;
102 161 return END_NOT_FOUND;
103 }
104
105 1895 static int jpeg_parse(AVCodecParserContext *s,
106 AVCodecContext *avctx,
107 const uint8_t **poutbuf, int *poutbuf_size,
108 const uint8_t *buf, int buf_size)
109 {
110 1895 MJPEGParserContext *m = s->priv_data;
111 1895 ParseContext *pc = &m->pc;
112 int next;
113
114
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 1895 if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
115 1714 next= buf_size;
116 }else{
117 181 next= find_frame_end(m, buf, buf_size);
118
119
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 181 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
120 161 *poutbuf = NULL;
121 161 *poutbuf_size = 0;
122 161 return buf_size;
123 }
124 }
125
126 1734 *poutbuf = buf;
127 1734 *poutbuf_size = buf_size;
128 1734 return next;
129 }
130
131
132 const FFCodecParser ff_mjpeg_parser = {
133 PARSER_CODEC_LIST(AV_CODEC_ID_MJPEG, AV_CODEC_ID_JPEGLS),
134 .priv_data_size = sizeof(MJPEGParserContext),
135 .parse = jpeg_parse,
136 .close = ff_parse_close,
137 };
138