FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/h264dec.c
Date: 2022-12-06 04:36:11
Exec Total Coverage
Lines: 60 62 96.8%
Functions: 1 1 100.0%
Branches: 53 56 94.6%

Line Branch Exec Source
1 /*
2 * RAW H.264 video demuxer
3 * Copyright (c) 2008 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 "libavcodec/get_bits.h"
23 #include "libavcodec/golomb.h"
24 #include "avformat.h"
25 #include "rawdec.h"
26
27 #define MAX_SPS_COUNT 32
28 #define MAX_PPS_COUNT 256
29
30 6782 static int h264_probe(const AVProbeData *p)
31 {
32 6782 uint32_t code = -1;
33 6782 int sps = 0, pps = 0, idr = 0, res = 0, sli = 0;
34 int i, ret;
35 6782 int pps_ids[MAX_PPS_COUNT+1] = {0};
36 6782 int sps_ids[MAX_SPS_COUNT+1] = {0};
37 unsigned pps_id, sps_id;
38 GetBitContext gb;
39
40
2/2
✓ Branch 0 taken 123559751 times.
✓ Branch 1 taken 5596 times.
123565347 for (i = 0; i + 2 < p->buf_size; i++) {
41 123559751 code = (code << 8) + p->buf[i];
42
2/2
✓ Branch 0 taken 13711 times.
✓ Branch 1 taken 123546040 times.
123559751 if ((code & 0xffffff00) == 0x100) {
43 13711 int ref_idc = (code >> 5) & 3;
44 13711 int type = code & 0x1F;
45 static const int8_t ref_zero[] = {
46 2, 0, 0, 0, 0, -1, 1, -1,
47 -1, 1, 1, 1, 1, -1, 2, 2,
48 2, 2, 2, 0, 2, 2, 2, 2,
49 2, 2, 2, 2, 2, 2, 2, 2
50 };
51
52
2/2
✓ Branch 0 taken 765 times.
✓ Branch 1 taken 12946 times.
13711 if (code & 0x80) // forbidden_bit
53 765 return 0;
54
55
4/4
✓ Branch 0 taken 432 times.
✓ Branch 1 taken 12514 times.
✓ Branch 2 taken 243 times.
✓ Branch 3 taken 189 times.
12946 if (ref_zero[type] == 1 && ref_idc)
56 243 return 0;
57
4/4
✓ Branch 0 taken 931 times.
✓ Branch 1 taken 11772 times.
✓ Branch 2 taken 92 times.
✓ Branch 3 taken 839 times.
12703 if (ref_zero[type] == -1 && !ref_idc)
58 92 return 0;
59
2/2
✓ Branch 0 taken 10613 times.
✓ Branch 1 taken 1998 times.
12611 if (ref_zero[type] == 2) {
60
6/6
✓ Branch 0 taken 9699 times.
✓ Branch 1 taken 914 times.
✓ Branch 2 taken 4685 times.
✓ Branch 3 taken 5014 times.
✓ Branch 4 taken 649 times.
✓ Branch 5 taken 4036 times.
10613 if (!(code == 0x100 && !p->buf[i + 1] && !p->buf[i + 2]))
61 6577 res++;
62 }
63
64 12611 ret = init_get_bits8(&gb, p->buf + i + 1, p->buf_size - i - 1);
65
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12611 times.
12611 if (ret < 0)
66 return 0;
67
68
4/4
✓ Branch 0 taken 458 times.
✓ Branch 1 taken 246 times.
✓ Branch 2 taken 274 times.
✓ Branch 3 taken 11633 times.
12611 switch (type) {
69 458 case 1:
70 case 5:
71 458 get_ue_golomb_long(&gb);
72
2/2
✓ Branch 1 taken 46 times.
✓ Branch 2 taken 412 times.
458 if (get_ue_golomb_long(&gb) > 9U)
73 46 return 0;
74 412 pps_id = get_ue_golomb_long(&gb);
75
2/2
✓ Branch 0 taken 19 times.
✓ Branch 1 taken 393 times.
412 if (pps_id > MAX_PPS_COUNT)
76 19 return 0;
77
2/2
✓ Branch 0 taken 57 times.
✓ Branch 1 taken 336 times.
393 if (!pps_ids[pps_id])
78 57 break;
79
80
2/2
✓ Branch 0 taken 81 times.
✓ Branch 1 taken 255 times.
336 if (type == 1)
81 81 sli++;
82 else
83 255 idr++;
84 336 break;
85 246 case 7:
86 246 skip_bits(&gb, 14);
87
2/2
✓ Branch 1 taken 6 times.
✓ Branch 2 taken 240 times.
246 if (get_bits(&gb, 2))
88 6 return 0;
89 240 skip_bits(&gb, 8);
90 240 sps_id = get_ue_golomb_long(&gb);
91
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 240 times.
240 if (sps_id > MAX_SPS_COUNT)
92 return 0;
93 240 sps_ids[sps_id] = 1;
94 240 sps++;
95 240 break;
96 274 case 8:
97 274 pps_id = get_ue_golomb_long(&gb);
98
2/2
✓ Branch 0 taken 14 times.
✓ Branch 1 taken 260 times.
274 if (pps_id > MAX_PPS_COUNT)
99 14 return 0;
100 260 sps_id = get_ue_golomb_long(&gb);
101
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 259 times.
260 if (sps_id > MAX_SPS_COUNT)
102 1 return 0;
103
2/2
✓ Branch 0 taken 15 times.
✓ Branch 1 taken 244 times.
259 if (!sps_ids[sps_id])
104 15 break;
105 244 pps_ids[pps_id] = 1;
106 244 pps++;
107 244 break;
108 }
109 }
110 }
111 ff_tlog(NULL, "sps:%d pps:%d idr:%d sli:%d res:%d\n", sps, pps, idr, sli, res);
112
113
9/10
✓ Branch 0 taken 231 times.
✓ Branch 1 taken 5365 times.
✓ Branch 2 taken 230 times.
✓ Branch 3 taken 1 times.
✓ Branch 4 taken 15 times.
✓ Branch 5 taken 215 times.
✓ Branch 6 taken 4 times.
✓ Branch 7 taken 11 times.
✓ Branch 8 taken 219 times.
✗ Branch 9 not taken.
5596 if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr))
114 219 return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
115
116 5377 return 0;
117 }
118
119 FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)
120