FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tak_parser.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 49 57 86.0%
Branches: 38 50 76.0%

Line Branch Exec Source
1 /*
2 * TAK parser
3 * Copyright (c) 2012 Michael Niedermayer
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 * TAK parser
25 **/
26
27 #define CACHED_BITSTREAM_READER !ARCH_X86_32
28 #define BITSTREAM_READER_LE
29 #include "parser.h"
30 #include "tak.h"
31
32 typedef struct TAKParseContext {
33 ParseContext pc;
34 TAKStreamInfo ti;
35 int index;
36 } TAKParseContext;
37
38 1026 static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
39 const uint8_t **poutbuf, int *poutbuf_size,
40 const uint8_t *buf, int buf_size)
41 {
42 1026 TAKParseContext *t = s->priv_data;
43 1026 ParseContext *pc = &t->pc;
44 1026 int next = END_NOT_FOUND;
45 GetBitContext gb;
46 1026 int consumed = 0;
47
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1026 int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
48 int ret;
49
50 1026 *poutbuf = buf;
51 1026 *poutbuf_size = buf_size;
52
53
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1026 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
54 TAKStreamInfo ti;
55 if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
56 return buf_size;
57 if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
58 s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples
59 : t->ti.frame_samples;
60 return buf_size;
61 }
62
63
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28677 while (buf_size || t->index + needed <= pc->index) {
64
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27688 if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
65 27687 int tmp_buf_size = FFMIN(TAK_MAX_FRAME_HEADER_BYTES,
66 buf_size);
67 27687 const uint8_t *tmp_buf = buf;
68
69
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27687 if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1)
70 goto fail;
71 27687 consumed += tmp_buf_size;
72 27687 buf += tmp_buf_size;
73 27687 buf_size -= tmp_buf_size;
74 }
75
76
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1037901 for (; t->index + needed <= pc->index; t->index++) {
77
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1010250 if (pc->buffer[ t->index ] == 0xFF &&
78
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3663 pc->buffer[ t->index + 1 ] == 0xA0) {
79 TAKStreamInfo ti;
80
81
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86 if ((ret = init_get_bits8(&gb, pc->buffer + t->index,
82 86 pc->index - t->index)) < 0)
83 goto fail;
84
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86 if (!ff_tak_decode_frame_header(avctx, &gb,
85
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169 pc->frame_start_found ? &ti : &t->ti, 127) &&
86 83 !ff_tak_check_crc(pc->buffer + t->index,
87 83 get_bits_count(&gb) / 8)) {
88
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75 if (!pc->frame_start_found) {
89 38 pc->frame_start_found = 1;
90 76 s->duration = t->ti.last_frame_samples ?
91
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38 t->ti.last_frame_samples :
92 t->ti.frame_samples;
93 38 s->key_frame = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO);
94 } else {
95 37 pc->frame_start_found = 0;
96 37 next = t->index - pc->index;
97 37 t->index = 0;
98 37 goto found;
99 }
100 }
101 }
102 }
103 }
104 989 found:
105
106
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1065 if (consumed && !buf_size && next == END_NOT_FOUND ||
107 39 ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
108 987 goto fail;
109 }
110
111
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39 if (next != END_NOT_FOUND) {
112 37 next += consumed;
113
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37 pc->overread = FFMAX(0, -next);
114 }
115
116 39 *poutbuf = buf;
117 39 *poutbuf_size = buf_size;
118 39 return next;
119
120 987 fail:
121 987 *poutbuf = NULL;
122 987 *poutbuf_size = 0;
123 987 return buf_size + consumed;
124 }
125
126 const AVCodecParser ff_tak_parser = {
127 .codec_ids = { AV_CODEC_ID_TAK },
128 .priv_data_size = sizeof(TAKParseContext),
129 .parser_parse = tak_parse,
130 .parser_close = ff_parse_close,
131 };
132