FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tests/bitstream_template.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 89 95 93.7%
Functions: 1 1 100.0%
Branches: 39 50 78.0%

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
65 /* generate random input, using a given or random seed */
66
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2 if (argc > 1)
67 random_seed = strtoul(argv[1], NULL, 0);
68 else
69 2 random_seed = av_get_random_seed();
70
71 2 fprintf(stderr, "Testing with LFG seed: %"PRIu32"\n", random_seed);
72 2 av_lfg_init(&lfg, random_seed);
73
74
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316 for (unsigned i = 0; i < SIZE; i++)
75 314 buf[i] = av_lfg_get(&lfg);
76
77 2 bits_init8 (&bc, buf, SIZE);
78 2 init_put_bits(&pb, dst, SIZE);
79
80 /* use a random sequence of bitreading operations to transfer data
81 * from BitstreamContext to PutBitContext */
82
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174 while (bits_left(&bc) > 0) {
83 172 enum Op op = av_lfg_get(&lfg) % OP_NB;
84
85
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172 switch (op) {
86 16 case OP_READ:
87
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16 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
88 16 val1 = bits_peek(&bc, count);
89 16 val = bits_read(&bc, count);
90
91 16 fprintf(stderr, "%d read %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
92
93
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16 av_assert0(val == val1);
94
95 16 put_bits64(&pb, count, val);
96 16 break;
97 19 case OP_READ_NZ:
98
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19 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
99 19 count = FFMAX(count, 1);
100 19 val1 = bits_peek_nz(&bc, count);
101 19 val = bits_read_nz(&bc, count);
102
103 19 fprintf(stderr, "%d read_nz %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
104
105
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19 av_assert0(val == val1);
106
107 19 put_bits64(&pb, count, val);
108 19 break;
109 17 case OP_READ_BIT:
110 17 val = bits_read_bit(&bc);
111
112 17 fprintf(stderr, "%d read_bit: %"PRIu64"\n", bits_tell(&bc) - 1, val);
113
114 17 put_bits(&pb, 1, val);
115 17 break;
116 18 case OP_READ_63:
117
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18 count = av_lfg_get(&lfg) % FFMIN(64, bits_left(&bc) + 1);
118 18 val = bits_read_63(&bc, count);
119
120 18 fprintf(stderr, "%d read_63 %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
121
122 18 put_bits64(&pb, count, val);
123 18 break;
124 19 case OP_READ_64:
125
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19 count = av_lfg_get(&lfg) % FFMIN(65, bits_left(&bc) + 1);
126 19 val = bits_read_64(&bc, count);
127
128 19 fprintf(stderr, "%d read_64 %u: %"PRIu64"\n", bits_tell(&bc) - count, count, val);
129
130 19 put_bits64(&pb, count, val);
131 19 break;
132 21 case OP_READ_SIGNED:
133
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21 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
134 21 sval1 = bits_peek_signed(&bc, count);
135 21 sval = bits_read_signed(&bc, count);
136
137 21 fprintf(stderr, "%d read_signed %u: %"PRId32"\n", bits_tell(&bc) - count, count, sval);
138
139
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21 av_assert0(sval == sval1);
140
141
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21 if (count == 32) put_bits32(&pb, sval);
142 21 else put_sbits(&pb, count, sval);
143 21 break;
144 20 case OP_READ_SIGNED_NZ:
145
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20 count = av_lfg_get(&lfg) % FFMIN(33, bits_left(&bc) + 1);
146 20 count = FFMAX(count, 1);
147 20 sval1 = bits_peek_signed_nz(&bc, count);
148 20 sval = bits_read_signed_nz(&bc, count);
149
150 20 fprintf(stderr, "%d read_signed_nz %u: %"PRId32"\n", bits_tell(&bc) - count, count, sval);
151
152
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20 av_assert0(sval == sval1);
153
154
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20 if (count == 32) put_bits32(&pb, sval);
155 20 else put_sbits(&pb, count, sval);
156 20 break;
157 20 case OP_ALIGN:
158 20 count = (bits_tell(&bc) + 7) / 8 * 8 - bits_tell(&bc);
159
160 20 fprintf(stderr, "%d align %u\n", bits_tell(&bc), count);
161
162 20 put_bits(&pb, count, bits_peek(&bc, count));
163 20 bits_align(&bc);
164 20 break;
165 22 case OP_APPLY_SIGN:
166
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22 if (bits_left(&bc) < 2)
167 1 continue;
168
169
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21 count = av_lfg_get(&lfg) % FFMIN(32, bits_left(&bc));
170 21 count = FFMAX(count, 1);
171
172
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21 if (!bits_peek(&bc, count))
173 1 continue;
174
175 20 val = bits_read(&bc, count);
176 20 sval = bits_apply_sign(&bc, val);
177
178 20 fprintf(stderr, "%d apply_sign %u %"PRId32"\n",
179 20 bits_tell(&bc) - count - 1, count, sval);
180
181 20 put_bits64(&pb, count, FFABS(sval));
182 20 put_bits(&pb, 1, sval < 0);
183
184 20 break;
185 default:
186 av_assert0(0);
187 }
188 }
189
190 2 flush_put_bits(&pb);
191
192
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316 for (unsigned i = 0; i < SIZE; i++)
193
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314 if (buf[i] != dst[i]) {
194 fprintf(stderr, "Mismatch at byte %u: %hhu %hhu; seed %"PRIu32"\n",
195 i, buf[i], dst[i], random_seed);
196 return 1;
197 }
198
199 2 return 0;
200 }
201