FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/tools/scale_slice_test.c
Date: 2026-04-20 16:43:18
Exec Total Coverage
Lines: 65 80 81.2%
Functions: 2 2 100.0%
Branches: 38 52 73.1%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdio.h>
20 #include <stdint.h>
21 #include <stdlib.h>
22
23 #include "decode_simple.h"
24
25 #include "libavutil/common.h"
26 #include "libavutil/pixdesc.h"
27 #include "libavutil/error.h"
28 #include "libavutil/lfg.h"
29 #include "libavutil/random_seed.h"
30 #include "libavutil/video_enc_params.h"
31
32 #include "libavformat/avformat.h"
33
34 #include "libavcodec/avcodec.h"
35
36 #include "libswscale/swscale.h"
37
38 typedef struct PrivData {
39 unsigned int random_seed;
40 AVLFG lfg;
41
42 struct SwsContext *scaler;
43
44 int v_shift_dst, h_shift_dst;
45 int v_shift_src, h_shift_src;
46
47 AVFrame *frame_ref;
48 AVFrame *frame_dst;
49 } PrivData;
50
51 15 static int process_frame(DecodeContext *dc, AVFrame *frame)
52 {
53 15 PrivData *pd = dc->opaque;
54 15 int slice_start = 0;
55 int ret;
56
57
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 15 if (!frame)
58 4 return 0;
59
60
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 11 if (!pd->scaler) {
61 4 pd->scaler = sws_getContext(frame->width, frame->height, frame->format,
62 2 pd->frame_ref->width, pd->frame_ref->height,
63 2 pd->frame_ref->format, 0, NULL, NULL, NULL);
64
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 2 if (!pd->scaler)
65 ✗ return AVERROR(ENOMEM);
66
67 2 av_pix_fmt_get_chroma_sub_sample(frame->format, &pd->h_shift_src, &pd->v_shift_src);
68 }
69
70 /* scale the whole input frame as reference */
71 11 ret = sws_scale(pd->scaler, (const uint8_t **)frame->data, frame->linesize, 0, frame->height,
72 11 pd->frame_ref->data, pd->frame_ref->linesize);
73
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 11 if (ret < 0)
74 ✗ return ret;
75
76 /* scale slices with randomly generated heights */
77
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 88 while (slice_start < frame->height) {
78 int slice_height;
79 const uint8_t *src[4];
80
81 77 slice_height = av_lfg_get(&pd->lfg) % (frame->height - slice_start);
82 77 slice_height = FFALIGN(FFMAX(1, slice_height), 1 << pd->v_shift_src);
83
84
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 290 for (int j = 0; j < FF_ARRAY_ELEMS(src) && frame->data[j]; j++) {
85
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 213 int shift = (j == 1 || j == 2) ? pd->v_shift_src : 0;
86 213 src[j] = frame->data[j] + frame->linesize[j] * (slice_start >> shift);
87 }
88
89 77 ret = sws_scale(pd->scaler, src, frame->linesize, slice_start, slice_height,
90 77 pd->frame_dst->data, pd->frame_dst->linesize);
91
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 77 if (ret < 0)
92 ✗ return ret;
93
94 77 slice_start += slice_height;
95 }
96
97 /* compare the two results */
98
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 23 for (int i = 0; i < 4 && pd->frame_ref->data[i]; i++) {
99
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 12 int shift = (i == 1 || i == 2) ? pd->v_shift_dst : 0;
100
101 12 if (memcmp(pd->frame_ref->data[i], pd->frame_dst->data[i],
102
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 12 pd->frame_ref->linesize[i] * (pd->frame_ref->height >> shift))) {
103 ✗ fprintf(stderr, "mismatch frame %"PRId64" seed %u\n",
104 ✗ dc->decoder->frame_num - 1, pd->random_seed);
105 ✗ return AVERROR(EINVAL);
106 }
107 }
108
109 11 return 0;
110 }
111
112 2 int main(int argc, char **argv)
113 {
114 PrivData pd;
115 DecodeContext dc;
116
117 int width, height;
118 enum AVPixelFormat pix_fmt;
119 const char *filename;
120 2 int ret = 0;
121
122
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 2 if (argc <= 4) {
123 ✗ fprintf(stderr,
124 "Usage: %s <input file> <dst width> <dst height> <dst pixfmt> [<random seed>] \n",
125 argv[0]);
126 ✗ return 0;
127 }
128
129 2 memset(&pd, 0, sizeof(pd));
130
131 2 filename = argv[1];
132 2 width = strtol(argv[2], NULL, 0);
133 2 height = strtol(argv[3], NULL, 0);
134 2 pix_fmt = av_get_pix_fmt(argv[4]);
135
136 /* init RNG for generating slice sizes */
137
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 2 if (argc >= 6)
138 ✗ pd.random_seed = strtoul(argv[5], NULL, 0);
139 else
140 2 pd.random_seed = av_get_random_seed();
141
142 2 av_lfg_init(&pd.lfg, pd.random_seed);
143
144 2 av_pix_fmt_get_chroma_sub_sample(pix_fmt, &pd.h_shift_dst, &pd.v_shift_dst);
145
146 /* allocate the frames for scaler output */
147
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 6 for (int i = 0; i < 2; i++) {
148 4 AVFrame *frame = av_frame_alloc();
149
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 4 if (!frame) {
150 ✗ fprintf(stderr, "Error allocating frames\n");
151 ✗ return AVERROR(ENOMEM);
152 }
153
154 4 frame->width = width;
155 4 frame->height = height;
156 4 frame->format = pix_fmt;
157
158 4 ret = av_frame_get_buffer(frame, 0);
159
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 4 if (ret < 0) {
160 ✗ fprintf(stderr, "Error allocating frame data\n");
161 ✗ return ret;
162 }
163
164 /* make sure the padding is zeroed */
165
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 10 for (int j = 0; j < 4 && frame->data[j]; j++) {
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 6 int shift = (j == 1 || j == 2) ? pd.v_shift_dst : 0;
167 6 memset(frame->data[j], 0,
168 6 frame->linesize[j] * (height >> shift));
169 }
170
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 4 if (i) pd.frame_ref = frame;
171 2 else pd.frame_dst = frame;
172 }
173
174 2 ret = ds_open(&dc, filename, 0);
175
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 2 if (ret < 0) {
176 ✗ fprintf(stderr, "Error opening the file\n");
177 ✗ return ret;
178 }
179
180 2 dc.process_frame = process_frame;
181 2 dc.opaque = &pd;
182
183 2 ret = ds_run(&dc);
184
185 2 av_frame_free(&pd.frame_dst);
186 2 av_frame_free(&pd.frame_ref);
187 2 sws_freeContext(pd.scaler);
188 2 ds_free(&dc);
189 2 return ret;
190 }
191