FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dnxhd_parser.c
Date: 2025-11-28 06:05:02
Exec Total Coverage
Lines: 66 70 94.3%
Functions: 2 2 100.0%
Branches: 31 36 86.1%
Line Branch Exec Source
1 /*
2 * DNxHD/VC-3 parser
3 * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
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 /**
23 * @file
24 * DNxHD/VC-3 parser
25 */
26
27 #include "parser.h"
28 #include "dnxhddata.h"
29 #include "parser_internal.h"
30
31 typedef struct {
32 ParseContext pc;
33 int cur_byte;
34 int remaining;
35 int w, h;
36 } DNXHDParserContext;
37
38 177532 static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
39 const uint8_t *buf, int buf_size)
40 {
41 177532 ParseContext *pc = &dctx->pc;
42 177532 uint64_t state = pc->state64;
43 177532 int pic_found = pc->frame_start_found;
44 177532 int i = 0;
45
46
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 177532 if (!pic_found) {
47
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 2630 for (i = 0; i < buf_size; i++) {
48 2526 state = (state << 8) | buf[i];
49
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 2526 if (ff_dnxhd_check_header_prefix(state & 0xffffffffff00LL) != 0) {
50 421 i++;
51 421 pic_found = 1;
52 421 dctx->cur_byte = 0;
53 421 dctx->remaining = 0;
54 421 break;
55 }
56 }
57 }
58
59
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 177532 if (pic_found && !dctx->remaining) {
60
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 421 if (!buf_size) /* EOF considered as end of frame */
61 ✗ return 0;
62
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 17682 for (; i < buf_size; i++) {
63 17682 dctx->cur_byte++;
64 17682 state = (state << 8) | buf[i];
65
66
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 17682 if (dctx->cur_byte == 24) {
67 421 dctx->h = (state >> 32) & 0xFFFF;
68
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 17261 } else if (dctx->cur_byte == 26) {
69 421 dctx->w = (state >> 32) & 0xFFFF;
70
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 16840 } else if (dctx->cur_byte == 42) {
71 421 int cid = (state >> 32) & 0xFFFFFFFF;
72 int remaining;
73
74
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 421 if (cid <= 0)
75 ✗ continue;
76
77 421 remaining = ff_dnxhd_get_frame_size(cid);
78
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 421 if (remaining <= 0) {
79 218 remaining = ff_dnxhd_get_hr_frame_size(cid, dctx->w, dctx->h);
80
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 218 if (remaining <= 0)
81 ✗ continue;
82 }
83 421 remaining += i - 47;
84 421 dctx->remaining = remaining;
85
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 421 if (buf_size >= dctx->remaining) {
86 84 pc->frame_start_found = 0;
87 84 pc->state64 = -1;
88 84 dctx->cur_byte = 0;
89 84 dctx->remaining = 0;
90 84 return remaining;
91 } else {
92 337 dctx->remaining -= buf_size;
93 // Update variables for correctness, they are currently not used beyond here
94 337 state = -1;
95 337 dctx->cur_byte += buf_size - i;
96 337 break;
97 }
98 }
99 }
100
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 177111 } else if (pic_found) {
101
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 177007 if (dctx->remaining > buf_size) {
102 176670 dctx->remaining -= buf_size;
103 } else {
104 337 int remaining = dctx->remaining;
105
106 337 pc->frame_start_found = 0;
107 337 pc->state64 = -1;
108 337 dctx->cur_byte = 0;
109 337 dctx->remaining = 0;
110 337 return remaining;
111 }
112 }
113 177111 pc->frame_start_found = pic_found;
114 177111 pc->state64 = state;
115 177111 return END_NOT_FOUND;
116 }
117
118 177532 static int dnxhd_parse(AVCodecParserContext *s,
119 AVCodecContext *avctx,
120 const uint8_t **poutbuf, int *poutbuf_size,
121 const uint8_t *buf, int buf_size)
122 {
123 177532 DNXHDParserContext *dctx = s->priv_data;
124 177532 ParseContext *pc = &dctx->pc;
125 int next;
126
127
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 177532 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
128 ✗ next = buf_size;
129 } else {
130 177532 next = dnxhd_find_frame_end(dctx, buf, buf_size);
131
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 177532 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
132 177007 *poutbuf = NULL;
133 177007 *poutbuf_size = 0;
134 177007 return buf_size;
135 }
136 }
137 525 *poutbuf = buf;
138 525 *poutbuf_size = buf_size;
139 525 return next;
140 }
141
142 const FFCodecParser ff_dnxhd_parser = {
143 PARSER_CODEC_LIST(AV_CODEC_ID_DNXHD),
144 .priv_data_size = sizeof(DNXHDParserContext),
145 .parse = dnxhd_parse,
146 .close = ff_parse_close,
147 };
148