FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tests/bitstream_template.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 89 96 92.7%
Functions: 1 1 100.0%
Branches: 41 52 78.8%
Line Branch Exec Source
1 /*
2 * cached bitstream reader test
3 * copyright (c) 2022 Anton Khirnov <anton@khirnov.net>
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 #define ASSERT_LEVEL 2
23
24 #include "libavutil/avassert.h"
25 #include "libavutil/lfg.h"
26 #include "libavutil/random_seed.h"
27
28 #include "libavcodec/bitstream.h"
29 #include "libavcodec/defs.h"
30
31 #ifdef BITSTREAM_LE
32 #define BITSTREAM_WRITER_LE
33 #endif
34 #include "libavcodec/put_bits.h"
35
36 #define SIZE 157
37
38 enum Op {
39 OP_READ,
40 OP_READ_NZ,
41 OP_READ_BIT,
42 OP_READ_63,
43 OP_READ_64,
44 OP_READ_SIGNED,
45 OP_READ_SIGNED_NZ,
46 OP_APPLY_SIGN,
47 OP_ALIGN,
48 OP_NB,
49 };
50
51 2 int main(int argc, char **argv)
52 {
53 BitstreamContext bc;
54 PutBitContext pb;
55 AVLFG lfg;
56
57 uint8_t buf[SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
58 uint8_t dst[SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
59
60 uint32_t random_seed;
61 uint64_t val, val1;
62 int32_t sval, sval1;
63 unsigned count;
64 int ret;
65
66 /* generate random input, using a given or random seed */
67
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 2 if (argc > 1)
68 ✗ random_seed = strtoul(argv[1], NULL, 0);
69 else
70 2 random_seed = av_get_random_seed();
71
72 2 fprintf(stderr, "Testing with LFG seed: %"PRIu32"\n", random_seed);
73 2 av_lfg_init(&lfg, random_seed);
74
75
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 316 for (unsigned i = 0; i < SIZE; i++)
76 314 buf[i] = av_lfg_get(&lfg);
77
78 2 ret = bits_init8 (&bc, buf, SIZE);
79
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 2 av_assert0(ret >= 0);
80 2 init_put_bits(&pb, dst, SIZE);
81
82 /* use a random sequence of bitreading operations to transfer data
83 * from BitstreamContext to PutBitContext */
84
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 158 while (bits_left(&bc) > 0) {
85 156 enum Op op = av_lfg_get(&lfg) % OP_NB;
86
87
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 156 switch (op) {
88 19 case OP_READ:
89
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 19 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
90 19 val1 = bits_peek(&bc, count);
91 19 val = bits_read(&bc, count);
92
93 19 fprintf(stderr, "%d read %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
94
95
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 19 av_assert0(val == val1);
96
97 19 put_bits64(&pb, count, val);
98 19 break;
99 17 case OP_READ_NZ:
100
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 17 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
101 17 count = FFMAX(count, 1);
102 17 val1 = bits_peek_nz(&bc, count);
103 17 val = bits_read_nz(&bc, count);
104
105 17 fprintf(stderr, "%d read_nz %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
106
107
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 17 av_assert0(val == val1);
108
109 17 put_bits64(&pb, count, val);
110 17 break;
111 15 case OP_READ_BIT:
112 15 val = bits_read_bit(&bc);
113
114 15 fprintf(stderr, "%d read_bit: %"PRIu64"\n", bits_tell(&bc) - 1, val);
115
116 15 put_bits(&pb, 1, val);
117 15 break;
118 17 case OP_READ_63:
119
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 17 count = av_lfg_get(&lfg) % FFMIN(64, bits_left(&bc) + 1);
120 17 val = bits_read_63(&bc, count);
121
122 17 fprintf(stderr, "%d read_63 %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
123
124 17 put_bits64(&pb, count, val);
125 17 break;
126 16 case OP_READ_64:
127
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 16 count = av_lfg_get(&lfg) % FFMIN(65, bits_left(&bc) + 1);
128 16 val = bits_read_64(&bc, count);
129
130 16 fprintf(stderr, "%d read_64 %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
131
132 16 put_bits64(&pb, count, val);
133 16 break;
134 18 case OP_READ_SIGNED:
135
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 18 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
136 18 sval1 = bits_peek_signed(&bc, count);
137 18 sval = bits_read_signed(&bc, count);
138
139 18 fprintf(stderr, "%d read_signed %u: %"PRId32"\n", bits_tell(&bc) - count, count, sval);
140
141
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 18 av_assert0(sval == sval1);
142
143
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 18 if (count == 32) put_bits32(&pb, sval);
144 16 else put_sbits(&pb, count, sval);
145 18 break;
146 25 case OP_READ_SIGNED_NZ:
147
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 25 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
148 25 count = FFMAX(count, 1);
149 25 sval1 = bits_peek_signed_nz(&bc, count);
150 25 sval = bits_read_signed_nz(&bc, count);
151
152 25 fprintf(stderr, "%d read_signed_nz %u: %"PRId32"\n", bits_tell(&bc) - count, count, sval);
153
154
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 25 av_assert0(sval == sval1);
155
156
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 25 if (count == 32) put_bits32(&pb, sval);
157 25 else put_sbits(&pb, count, sval);
158 25 break;
159 14 case OP_ALIGN:
160 14 count = (bits_tell(&bc) + 7) / 8 * 8 - bits_tell(&bc);
161
162 14 fprintf(stderr, "%d align %u\n", bits_tell(&bc), count);
163
164 14 put_bits(&pb, count, bits_peek(&bc, count));
165 14 bits_align(&bc);
166 14 break;
167 15 case OP_APPLY_SIGN:
168
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 15 if (bits_left(&bc) < 2)
169 ✗ continue;
170
171
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 15 count = av_lfg_get(&lfg) % FFMIN(32, bits_left(&bc));
172 15 count = FFMAX(count, 1);
173
174
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 15 if (!bits_peek(&bc, count))
175 2 continue;
176
177 13 val = bits_read(&bc, count);
178 13 sval = bits_apply_sign(&bc, val);
179
180 13 fprintf(stderr, "%d apply_sign %u %"PRId32"\n",
181 13 bits_tell(&bc) - count - 1, count, sval);
182
183 13 put_bits64(&pb, count, FFABS(sval));
184 13 put_bits(&pb, 1, sval < 0);
185
186 13 break;
187 ✗ default:
188 ✗ av_assert0(0);
189 }
190 }
191
192 2 flush_put_bits(&pb);
193
194
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 316 for (unsigned i = 0; i < SIZE; i++)
195
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 314 if (buf[i] != dst[i]) {
196 ✗ fprintf(stderr, "Mismatch at byte %u: %hhu %hhu; seed %"PRIu32"\n",
197 ✗ i, buf[i], dst[i], random_seed);
198 ✗ return 1;
199 }
200
201 2 return 0;
202 }
203