FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/vf_pixelize.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 66 86 76.7%
Functions: 6 9 66.7%
Branches: 41 80 51.2%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2022 Paul B Mahol
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 "libavutil/common.h"
22 #include "libavutil/internal.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/opt.h"
25
26 #include "avfilter.h"
27 #include "filters.h"
28 #include "video.h"
29
30 enum PixelizeModes {
31 PIXELIZE_AVG,
32 PIXELIZE_MIN,
33 PIXELIZE_MAX,
34 PIXELIZE_MODES
35 };
36
37 typedef struct PixelizeContext {
38 const AVClass *class;
39
40 int block_w[4], block_h[4];
41 int mode;
42
43 int depth;
44 int planes;
45 int nb_planes;
46 int linesize[4];
47 int planewidth[4];
48 int planeheight[4];
49
50 int log2_chroma_w;
51 int log2_chroma_h;
52
53 int (*pixelize[PIXELIZE_MODES])(const uint8_t *src, uint8_t *dst,
54 ptrdiff_t src_linesize,
55 ptrdiff_t dst_linesize,
56 int w, int h);
57 } PixelizeContext;
58
59 static const enum AVPixelFormat pix_fmts[] = {
60 AV_PIX_FMT_GRAY8,
61 AV_PIX_FMT_GRAY9,
62 AV_PIX_FMT_GRAY10,
63 AV_PIX_FMT_GRAY12,
64 AV_PIX_FMT_GRAY14,
65 AV_PIX_FMT_GRAY16,
66 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
67 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
68 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
69 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
70 AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
71 AV_PIX_FMT_YUVJ411P,
72 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
73 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
74 AV_PIX_FMT_YUV440P10,
75 AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
76 AV_PIX_FMT_YUV440P12,
77 AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
78 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
79 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
80 AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
81 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
82 AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
83 AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
84 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
85 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
86 AV_PIX_FMT_NONE
87 };
88
89 typedef struct ThreadData {
90 AVFrame *in, *out;
91 } ThreadData;
92
93 #define PIXELIZE_AVG(name, type, stype) \
94 static int pixelize_avg##name(const uint8_t *ssrc, uint8_t *ddst, \
95 ptrdiff_t src_linesize, ptrdiff_t dst_linesize, \
96 int w, int h) \
97 { \
98 const type *src = (const type *)ssrc; \
99 type *dst = (type *)ddst; \
100 stype sum = 0; \
101 type fill; \
102 for (int y = 0; y < h; y++) { \
103 for (int x = 0; x < w; x++) \
104 sum += src[x]; \
105 \
106 src += src_linesize / sizeof(type); \
107 } \
108 \
109 fill = sum / (w * h); \
110 \
111 for (int y = 0; y < h; y++) { \
112 for (int x = 0; x < w; x++) \
113 dst[x] = fill; \
114 \
115 dst += dst_linesize / sizeof(type); \
116 } \
117 \
118 return 0; \
119 }
120
121 #define PIXELIZE_MIN(name, type, stype) \
122 static int pixelize_min##name(const uint8_t *ssrc, uint8_t *ddst, \
123 ptrdiff_t src_linesize, ptrdiff_t dst_linesize, \
124 int w, int h) \
125 { \
126 const type *src = (const type *)ssrc; \
127 type *dst = (type *)ddst; \
128 type fill = src[0]; \
129 \
130 for (int y = 0; y < h; y++) { \
131 for (int x = 0; x < w; x++) \
132 fill = FFMIN(src[x], fill); \
133 \
134 src += src_linesize / sizeof(type); \
135 } \
136 \
137 for (int y = 0; y < h; y++) { \
138 for (int x = 0; x < w; x++) \
139 dst[x] = fill; \
140 \
141 dst += dst_linesize / sizeof(type); \
142 } \
143 \
144 return 0; \
145 }
146
147 #define PIXELIZE_MAX(name, type, stype) \
148 static int pixelize_max##name(const uint8_t *ssrc, uint8_t *ddst, \
149 ptrdiff_t src_linesize, ptrdiff_t dst_linesize, \
150 int w, int h) \
151 { \
152 const type *src = (const type *)ssrc; \
153 type *dst = (type *)ddst; \
154 type fill = src[0]; \
155 \
156 for (int y = 0; y < h; y++) { \
157 for (int x = 0; x < w; x++) \
158 fill = FFMAX(src[x], fill); \
159 \
160 src += src_linesize / sizeof(type); \
161 } \
162 \
163 for (int y = 0; y < h; y++) { \
164 for (int x = 0; x < w; x++) \
165 dst[x] = fill; \
166 \
167 dst += dst_linesize / sizeof(type); \
168 } \
169 \
170 return 0; \
171 }
172
173
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 1983960 PIXELIZE_AVG(8, uint8_t, unsigned)
174 ✗ PIXELIZE_AVG(16, uint16_t, uint64_t)
175
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 1983960 PIXELIZE_MIN(8, uint8_t, unsigned)
176 ✗ PIXELIZE_MIN(16, uint16_t, uint64_t)
177
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 1983960 PIXELIZE_MAX(8, uint8_t, unsigned)
178 ✗ PIXELIZE_MAX(16, uint16_t, uint64_t)
179
180 18 static int pixelize_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
181 {
182 18 PixelizeContext *s = ctx->priv;
183 18 const int mode = s->mode;
184 18 ThreadData *td = arg;
185 18 AVFrame *out = td->out;
186 18 AVFrame *in = td->in;
187
188
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 72 for (int p = 0; p < s->nb_planes; p++) {
189 54 const int wh = s->planeheight[p];
190 54 const int h = (s->planeheight[p] + s->block_h[p] - 1) / s->block_h[p];
191 54 const int w = (s->planewidth[p] + s->block_w[p] - 1) / s->block_w[p];
192 54 const int wslice_start = (wh * jobnr) / nb_jobs;
193 54 const int wslice_end = (wh * (jobnr+1)) / nb_jobs;
194 54 const int slice_start = (h * jobnr) / nb_jobs;
195 54 const int slice_end = (h * (jobnr+1)) / nb_jobs;
196 54 const ptrdiff_t out_linesize = out->linesize[p];
197 54 const ptrdiff_t in_linesize = in->linesize[p];
198 54 const uint8_t *src = in->data[p];
199 54 uint8_t *dst = out->data[p];
200
201
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 54 if (!((1 << p) & s->planes)) {
202 ✗ av_image_copy_plane(dst + wslice_start * out_linesize,
203 out_linesize,
204 ✗ src + wslice_start * in_linesize,
205 in_linesize,
206 s->linesize[p], wslice_end - wslice_start);
207 ✗ continue;
208 }
209
210
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 1026 for (int y = slice_start; y < slice_end; y++) {
211 972 const int block_h = FFMIN(s->block_h[p], s->planeheight[p] - y * s->block_h[p]);
212
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 22356 for (int x = 0; x < w; x++) {
213 21384 const int block_w = FFMIN(s->block_w[p], s->planewidth[p] - x * s->block_w[p]);
214
215 64152 s->pixelize[mode](src + s->block_h[p] * y * in_linesize +
216 21384 x * s->block_w[p] * (1 + (s->depth > 8)),
217 42768 dst + s->block_h[p] * y * out_linesize +
218
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 21384 x * s->block_w[p] * (1 + (s->depth > 8)),
219 in_linesize, out_linesize, block_w, block_h);
220 }
221 }
222 }
223
224 18 return 0;
225 }
226
227 3 static int config_output(AVFilterLink *outlink)
228 {
229 3 AVFilterContext *ctx = outlink->src;
230 3 PixelizeContext *s = ctx->priv;
231 3 AVFilterLink *inlink = ctx->inputs[0];
232 const AVPixFmtDescriptor *desc;
233 int ret;
234
235 3 desc = av_pix_fmt_desc_get(outlink->format);
236
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 3 if (!desc)
237 ✗ return AVERROR_BUG;
238 3 s->nb_planes = av_pix_fmt_count_planes(outlink->format);
239 3 s->depth = desc->comp[0].depth;
240
241
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 3 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
242 ✗ return ret;
243
244 3 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
245 3 s->planewidth[0] = s->planewidth[3] = inlink->w;
246
247 3 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
248 3 s->planeheight[0] = s->planeheight[3] = inlink->h;
249
250 3 s->log2_chroma_w = desc->log2_chroma_w;
251 3 s->log2_chroma_h = desc->log2_chroma_h;
252
253
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 3 s->pixelize[PIXELIZE_AVG] = s->depth <= 8 ? pixelize_avg8 : pixelize_avg16;
254
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 3 s->pixelize[PIXELIZE_MIN] = s->depth <= 8 ? pixelize_min8 : pixelize_min16;
255
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 3 s->pixelize[PIXELIZE_MAX] = s->depth <= 8 ? pixelize_max8 : pixelize_max16;
256
257 3 return 0;
258 }
259
260 18 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
261 {
262 18 AVFilterContext *ctx = inlink->dst;
263 18 AVFilterLink *outlink = ctx->outputs[0];
264 18 PixelizeContext *s = ctx->priv;
265 ThreadData td;
266 AVFrame *out;
267 int ret;
268
269 18 s->block_w[1] = s->block_w[2] = FFMAX(1, s->block_w[0] >> s->log2_chroma_w);
270 18 s->block_w[3] = s->block_w[0] = s->block_w[1] << s->log2_chroma_w;
271
272 18 s->block_h[1] = s->block_h[2] = FFMAX(1, s->block_h[0] >> s->log2_chroma_h);
273 18 s->block_h[3] = s->block_h[0] = s->block_h[1] << s->log2_chroma_h;
274
275
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 18 if (av_frame_is_writable(in)) {
276 18 out = in;
277 } else {
278 ✗ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
279 ✗ if (!out) {
280 ✗ ret = AVERROR(ENOMEM);
281 ✗ goto fail;
282 }
283
284 ✗ ret = av_frame_copy_props(out, in);
285 ✗ if (ret < 0) {
286 ✗ av_frame_free(&out);
287 ✗ goto fail;
288 }
289 }
290
291 18 td.out = out;
292 18 td.in = in;
293 18 ff_filter_execute(ctx, pixelize_slice, &td, NULL,
294
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 18 FFMIN((s->planeheight[1] + s->block_h[1] - 1) / s->block_h[1],
295 ff_filter_get_nb_threads(ctx)));
296
297
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 18 if (out != in)
298 ✗ av_frame_free(&in);
299 18 return ff_filter_frame(outlink, out);
300 ✗ fail:
301 ✗ av_frame_free(&in);
302 ✗ return ret;
303 }
304
305 #define OFFSET(x) offsetof(PixelizeContext, x)
306 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_RUNTIME_PARAM)
307
308 static const AVOption pixelize_options[] = {
309 { "width", "set block width", OFFSET(block_w[0]), AV_OPT_TYPE_INT, {.i64=16}, 1, 1024, FLAGS },
310 { "w", "set block width", OFFSET(block_w[0]), AV_OPT_TYPE_INT, {.i64=16}, 1, 1024, FLAGS },
311 { "height", "set block height", OFFSET(block_h[0]), AV_OPT_TYPE_INT, {.i64=16}, 1, 1024, FLAGS },
312 { "h", "set block height", OFFSET(block_h[0]), AV_OPT_TYPE_INT, {.i64=16}, 1, 1024, FLAGS },
313 { "mode", "set the pixelize mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, PIXELIZE_MODES-1, FLAGS, .unit = "mode" },
314 { "m", "set the pixelize mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, PIXELIZE_MODES-1, FLAGS, .unit = "mode" },
315 { "avg", "average", 0, AV_OPT_TYPE_CONST, {.i64=PIXELIZE_AVG}, 0, 0, FLAGS, .unit = "mode" },
316 { "min", "minimum", 0, AV_OPT_TYPE_CONST, {.i64=PIXELIZE_MIN}, 0, 0, FLAGS, .unit = "mode" },
317 { "max", "maximum", 0, AV_OPT_TYPE_CONST, {.i64=PIXELIZE_MAX}, 0, 0, FLAGS, .unit = "mode" },
318 { "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=15}, 0, 15, FLAGS },
319 { "p", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=15}, 0, 15, FLAGS },
320 { NULL },
321 };
322
323 AVFILTER_DEFINE_CLASS(pixelize);
324
325 static const AVFilterPad pixelize_inputs[] = {
326 {
327 .name = "default",
328 .type = AVMEDIA_TYPE_VIDEO,
329 .filter_frame = filter_frame,
330 },
331 };
332
333 static const AVFilterPad pixelize_outputs[] = {
334 {
335 .name = "default",
336 .type = AVMEDIA_TYPE_VIDEO,
337 .config_props = config_output,
338 },
339 };
340
341 const FFFilter ff_vf_pixelize = {
342 .p.name = "pixelize",
343 .p.description = NULL_IF_CONFIG_SMALL("Pixelize video."),
344 .p.priv_class = &pixelize_class,
345 .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
346 .priv_size = sizeof(PixelizeContext),
347 FILTER_INPUTS(pixelize_inputs),
348 FILTER_OUTPUTS(pixelize_outputs),
349 FILTER_PIXFMTS_ARRAY(pix_fmts),
350 .process_command = ff_filter_process_command,
351 };
352