FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/tests/checkasm/png.c
Date: 2026-09-28 11:37:26
Exec Total Coverage
Lines: 51 51 100.0%
Functions: 3 3 100.0%
Branches: 30 66 45.5%
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1 /*
2 * Copyright (c) 2026 Zhao Zhili <quinkblack@foxmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <string.h>
22
23 #include "libavutil/mem_internal.h"
24 #include "libavcodec/pngdsp.h"
25
26 #include "checkasm.h"
27
28 #define BUF_SIZE 4096
29
30 #define randomize_buf(buf, size) \
31 do { \
32 for (int i = 0; i < size; i++) \
33 buf[i] = (uint8_t)rnd(); \
34 } while (0)
35
36 14 static void check_add_bytes_l2(const PNGDSPContext *c)
37 {
38 14 LOCAL_ALIGNED_16(uint8_t, dst0, [BUF_SIZE]);
39 14 LOCAL_ALIGNED_16(uint8_t, dst1, [BUF_SIZE]);
40 14 LOCAL_ALIGNED_16(uint8_t, src, [2], [BUF_SIZE]);
41
42 14 declare_func(void, uint8_t * dst, const uint8_t *src1,
43 const uint8_t *src2, int w);
44
45
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 57358 randomize_buf(dst0, BUF_SIZE);
46 14 memcpy(dst1, dst0, BUF_SIZE);
47
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 57358 randomize_buf(src[0], BUF_SIZE);
48
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 57358 randomize_buf(src[1], BUF_SIZE);
49
50 14 const int size[] = {15, 2043, 4096};
51
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 56 for (int i = 0; i < FF_ARRAY_ELEMS(size); i++) {
52
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 42 if (check_func(c->add_bytes_l2, "add_bytes_l2_%d", size[i])) {
53
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 6 call_ref(dst0, src[0], src[1], size[i]);
54 6 call_new(dst1, src[0], src[1], size[i]);
55 6 checkasm_check(uint8_t, dst0, BUF_SIZE, dst1, BUF_SIZE, BUF_SIZE, 1, "dst");
56
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 6 if (size[i] == BUF_SIZE)
57
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 2 bench_new(dst1, src[0], src[1], BUF_SIZE);
58 }
59 }
60 14 }
61
62 14 static void check_add_paeth_prediction(const PNGDSPContext *c)
63 {
64 14 LOCAL_ALIGNED_16(uint8_t, dst0_buf, [BUF_SIZE]);
65 14 LOCAL_ALIGNED_16(uint8_t, dst1_buf, [BUF_SIZE]);
66 14 LOCAL_ALIGNED_16(uint8_t, src, [BUF_SIZE]);
67 14 LOCAL_ALIGNED_16(uint8_t, top_buf, [BUF_SIZE]);
68
69
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 57358 randomize_buf(dst0_buf, BUF_SIZE);
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 57358 randomize_buf(src, BUF_SIZE);
71
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 57358 randomize_buf(top_buf, BUF_SIZE);
72
73 14 declare_func(void, uint8_t * dst, const uint8_t *src,
74 const uint8_t *top, int w, int bpp);
75
76 14 const int bpps[] = {3, 4, 6, 8};
77
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 70 for (int i = 0; i < FF_ARRAY_ELEMS(bpps); i++) {
78 56 int bpp = bpps[i];
79
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 56 if (check_func(c->add_paeth_prediction, "add_paeth_prediction_%d", bpp)) {
80 // add_paeth_prediction reads start from (dst - bpp) and (top - bpp).
81 8 uint8_t *dst0 = &dst0_buf[bpp];
82 8 uint8_t *dst1 = &dst1_buf[bpp];
83 8 uint8_t *top = &top_buf[bpp];
84 8 int w = (BUF_SIZE - bpp) / bpp * bpp;
85
86 // dst buffer is both read and written, so dst0 and dst1 must remain the same before test
87 8 memcpy(dst1_buf, dst0_buf, BUF_SIZE);
88
89
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 8 call_ref(dst0, src, top, w, bpp);
90 8 call_new(dst1, src, top, w, bpp);
91
92 /* This match the use case in ff_png_filter_row, that x86 asm version of
93 * add_paeth_prediction doesn't write last two bytes for bpp = 3 and 6.
94 * The C function takes care to rewrite the last 3 bytes.
95 */
96
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 8 if (bpp & 3) {
97
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 16 for (int j = w - 3; j < w; j++)
98 12 dst1[j] = dst0[j];
99 }
100 // check dst_buf to ensure there is no overwrite
101 8 checkasm_check(uint8_t, dst0_buf, 0, dst1_buf, 0, BUF_SIZE, 1, "dst");
102
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 8 bench_new(dst1, src, top, w, bpp);
103 }
104 }
105 14 }
106
107 14 void checkasm_check_png(void)
108 {
109 PNGDSPContext c;
110
111 14 ff_pngdsp_init(&c);
112
113 14 check_add_bytes_l2(&c);
114 14 report("add_bytes_l2");
115 14 check_add_paeth_prediction(&c);
116 14 report("add_paeth_prediction");
117 14 }
118