GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/xbm_parser.c Lines: 33 35 94.3 %
Date: 2021-04-20 15:25:36 Branches: 11 12 91.7 %

Line Branch Exec Source
1
/*
2
 * XBM parser
3
 * Copyright (c) 2021 Paul B Mahol
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
 * XBM parser
25
 */
26
27
#include "libavutil/common.h"
28
29
#include "parser.h"
30
31
typedef struct XBMParseContext {
32
    ParseContext pc;
33
    uint16_t state16;
34
    int count;
35
} XBMParseContext;
36
37
#define KEY (((uint64_t)'\n' << 56) | ((uint64_t)'#' << 48) | \
38
             ((uint64_t)'d' << 40)  | ((uint64_t)'e' << 32) | \
39
             ((uint64_t)'f' << 24) | ('i' << 16) | ('n' << 8) | \
40
             ('e' << 0))
41
42
#define END ((';' << 8) | ('\n' << 0))
43
44
3
static int xbm_init(AVCodecParserContext *s)
45
{
46
3
    XBMParseContext *bpc = s->priv_data;
47
48
3
    bpc->count = 1;
49
50
3
    return 0;
51
}
52
53
13
static int xbm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
54
                     const uint8_t **poutbuf, int *poutbuf_size,
55
                     const uint8_t *buf, int buf_size)
56
{
57
13
    XBMParseContext *bpc = s->priv_data;
58
13
    uint64_t state = bpc->pc.state64;
59
13
    uint16_t state16 = bpc->state16;
60
13
    int next = END_NOT_FOUND, i = 0;
61
62
13
    s->pict_type = AV_PICTURE_TYPE_I;
63
13
    s->key_frame = 1;
64
13
    s->duration  = 1;
65
66
13
    *poutbuf_size = 0;
67
13
    *poutbuf = NULL;
68
69
29039
    for (; i < buf_size; i++) {
70
29028
        state = (state << 8) | buf[i];
71
29028
        state16 = (state16 << 8) | buf[i];
72
73
29028
        if (state == KEY)
74
3
            bpc->count++;
75
76

29028
        if ((state == KEY && bpc->count == 1)) {
77
            next = i - 6;
78
            break;
79
29028
        } else if (state16 == END) {
80
2
            next = i + 1;
81
2
            bpc->count = 0;
82
2
            break;
83
        }
84
    }
85
86
13
    bpc->pc.state64 = state;
87
13
    bpc->state16 = state16;
88
13
    if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) {
89
8
        *poutbuf = NULL;
90
8
        *poutbuf_size = 0;
91
8
        return buf_size;
92
    }
93
94
5
    *poutbuf      = buf;
95
5
    *poutbuf_size = buf_size;
96
97
5
    return next;
98
}
99
100
AVCodecParser ff_xbm_parser = {
101
    .codec_ids      = { AV_CODEC_ID_XBM },
102
    .priv_data_size = sizeof(XBMParseContext),
103
    .parser_init    = xbm_init,
104
    .parser_parse   = xbm_parse,
105
    .parser_close   = ff_parse_close,
106
};