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path: root/libavfilter/vf_midequalizer.c (plain)
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1/*
2 * Copyright (c) 2017 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/imgutils.h"
22#include "libavutil/pixdesc.h"
23#include "libavutil/opt.h"
24#include "avfilter.h"
25#include "formats.h"
26#include "internal.h"
27#include "video.h"
28#include "framesync.h"
29
30typedef struct MidEqualizerContext {
31 const AVClass *class;
32 int width[2][4], height[2][4];
33 int nb_planes;
34 int planes;
35 int histogram_size;
36 float *histogram[2];
37 unsigned *cchange;
38 FFFrameSync fs;
39
40 void (*midequalizer)(const uint8_t *in0, const uint8_t *in1,
41 uint8_t *dst,
42 ptrdiff_t linesize1, ptrdiff_t linesize2,
43 ptrdiff_t dlinesize,
44 int w0, int h0,
45 int w1, int h1,
46 float *histogram1, float *histogram2,
47 unsigned *cchange, size_t hsize);
48} MidEqualizerContext;
49
50#define OFFSET(x) offsetof(MidEqualizerContext, x)
51#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
52
53static const AVOption midequalizer_options[] = {
54 { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
55 { NULL }
56};
57
58AVFILTER_DEFINE_CLASS(midequalizer);
59
60static int query_formats(AVFilterContext *ctx)
61{
62 static const enum AVPixelFormat pix_fmts[] = {
63 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
64 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
65 AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
66 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
67 AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
68 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
69 AV_PIX_FMT_GRAY8,
70 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
71 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
72 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
73 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
74 AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
75 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
76 AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
77 AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
78 AV_PIX_FMT_NONE
79 };
80
81 return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
82}
83
84static int process_frame(FFFrameSync *fs)
85{
86 AVFilterContext *ctx = fs->parent;
87 MidEqualizerContext *s = fs->opaque;
88 AVFilterLink *outlink = ctx->outputs[0];
89 AVFrame *out, *in0, *in1;
90 int ret;
91
92 if ((ret = ff_framesync_get_frame(&s->fs, 0, &in0, 0)) < 0 ||
93 (ret = ff_framesync_get_frame(&s->fs, 1, &in1, 0)) < 0)
94 return ret;
95
96 if (ctx->is_disabled) {
97 out = av_frame_clone(in0);
98 if (!out)
99 return AVERROR(ENOMEM);
100 } else {
101 int p;
102
103 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
104 if (!out)
105 return AVERROR(ENOMEM);
106 av_frame_copy_props(out, in0);
107
108 for (p = 0; p < s->nb_planes; p++) {
109 if (!((1 << p) & s->planes)) {
110 av_image_copy_plane(out->data[p], out->linesize[p], in0->data[p], in0->linesize[p],
111 s->width[0][p] * (1 + (s->histogram_size > 256)), s->height[0][p]);
112 continue;
113 }
114
115 s->midequalizer(in0->data[p], in1->data[p],
116 out->data[p],
117 in0->linesize[p], in1->linesize[p],
118 out->linesize[p],
119 s->width[0][p], s->height[0][p],
120 s->width[1][p], s->height[1][p],
121 s->histogram[0], s->histogram[1],
122 s->cchange, s->histogram_size);
123 }
124 }
125 out->pts = av_rescale_q(in0->pts, s->fs.time_base, outlink->time_base);
126
127 return ff_filter_frame(outlink, out);
128}
129
130static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
131 int w, int h, float *histogram, size_t hsize)
132{
133 int y, x;
134
135 memset(histogram, 0, hsize * sizeof(*histogram));
136
137 for (y = 0; y < h; y++) {
138 for (x = 0; x < w; x++) {
139 histogram[src[x]] += 1;
140 }
141 src += linesize;
142 }
143
144 for (x = 0; x < hsize - 1; x++) {
145 histogram[x + 1] += histogram[x];
146 histogram[x] /= hsize;
147 }
148 histogram[x] /= hsize;
149}
150
151static void compute_histogram16(const uint16_t *src, ptrdiff_t linesize,
152 int w, int h, float *histogram, size_t hsize)
153{
154 int y, x;
155
156 memset(histogram, 0, hsize * sizeof(*histogram));
157
158 for (y = 0; y < h; y++) {
159 for (x = 0; x < w; x++) {
160 histogram[src[x]] += 1;
161 }
162 src += linesize;
163 }
164
165 for (x = 0; x < hsize - 1; x++) {
166 histogram[x + 1] += histogram[x];
167 histogram[x] /= hsize;
168 }
169 histogram[x] /= hsize;
170}
171
172static void compute_contrast_change(float *histogram1, float *histogram2,
173 unsigned *cchange, size_t hsize)
174{
175 int i;
176
177 for (i = 0; i < hsize; i++) {
178 int j;
179
180 for (j = 0; j < hsize && histogram2[j] < histogram1[i]; j++);
181
182 cchange[i] = (i + j) / 2;
183 }
184}
185
186static void midequalizer8(const uint8_t *in0, const uint8_t *in1,
187 uint8_t *dst,
188 ptrdiff_t linesize1, ptrdiff_t linesize2,
189 ptrdiff_t dlinesize,
190 int w0, int h0,
191 int w1, int h1,
192 float *histogram1, float *histogram2,
193 unsigned *cchange,
194 size_t hsize)
195{
196 int x, y;
197
198 compute_histogram8(in0, linesize1, w0, h0, histogram1, hsize);
199 compute_histogram8(in1, linesize2, w1, h1, histogram2, hsize);
200
201 compute_contrast_change(histogram1, histogram2, cchange, hsize);
202
203 for (y = 0; y < h0; y++) {
204 for (x = 0; x < w0; x++) {
205 dst[x] = av_clip_uint8(cchange[in0[x]]);
206 }
207 dst += dlinesize;
208 in0 += linesize1;
209 }
210}
211
212static void midequalizer16(const uint8_t *in0, const uint8_t *in1,
213 uint8_t *dst,
214 ptrdiff_t linesize1, ptrdiff_t linesize2,
215 ptrdiff_t dlinesize,
216 int w0, int h0,
217 int w1, int h1,
218 float *histogram1, float *histogram2,
219 unsigned *cchange,
220 size_t hsize)
221{
222 const uint16_t *i = (const uint16_t *)in0;
223 uint16_t *d = (uint16_t *)dst;
224 int x, y;
225
226 compute_histogram16(i, linesize1 / 2, w0, h0, histogram1, hsize);
227 compute_histogram16((const uint16_t *)in1, linesize2 / 2, w1, h1, histogram2, hsize);
228
229 compute_contrast_change(histogram1, histogram2, cchange, hsize);
230
231 for (y = 0; y < h0; y++) {
232 for (x = 0; x < w0; x++) {
233 d[x] = cchange[i[x]];
234 }
235 d += dlinesize / 2;
236 i += linesize1 / 2;
237 }
238}
239
240static int config_input0(AVFilterLink *inlink)
241{
242 AVFilterContext *ctx = inlink->dst;
243 MidEqualizerContext *s = ctx->priv;
244 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
245 int vsub, hsub;
246
247 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
248
249 hsub = desc->log2_chroma_w;
250 vsub = desc->log2_chroma_h;
251
252 s->height[0][0] = s->height[0][3] = inlink->h;
253 s->width[0][0] = s->width[0][3] = inlink->w;
254 s->height[0][1] = s->height[0][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
255 s->width[0][1] = s->width[0][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
256
257 s->histogram_size = 1 << desc->comp[0].depth;
258
259 s->histogram[0] = av_calloc(s->histogram_size, sizeof(float));
260 s->histogram[1] = av_calloc(s->histogram_size, sizeof(float));
261 s->cchange = av_calloc(s->histogram_size, sizeof(unsigned));
262 if (!s->histogram[0] || !s->histogram[1] || !s->cchange)
263 return AVERROR(ENOMEM);
264
265 if (s->histogram_size == 256) {
266 s->midequalizer = midequalizer8;
267 } else {
268 s->midequalizer = midequalizer16;
269 }
270
271 return 0;
272}
273
274static int config_input1(AVFilterLink *inlink)
275{
276 AVFilterContext *ctx = inlink->dst;
277 MidEqualizerContext *s = ctx->priv;
278 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
279 int vsub, hsub;
280
281 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
282
283 hsub = desc->log2_chroma_w;
284 vsub = desc->log2_chroma_h;
285
286 s->height[1][0] = s->height[1][3] = inlink->h;
287 s->width[1][0] = s->width[1][3] = inlink->w;
288 s->height[1][1] = s->height[1][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
289 s->width[1][1] = s->width[1][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
290
291 return 0;
292}
293
294static int config_output(AVFilterLink *outlink)
295{
296 AVFilterContext *ctx = outlink->src;
297 MidEqualizerContext *s = ctx->priv;
298 AVFilterLink *in0 = ctx->inputs[0];
299 AVFilterLink *in1 = ctx->inputs[1];
300 FFFrameSyncIn *in;
301 int ret;
302
303 if (in0->format != in1->format) {
304 av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
305 return AVERROR(EINVAL);
306 }
307
308 outlink->w = in0->w;
309 outlink->h = in0->h;
310 outlink->time_base = in0->time_base;
311 outlink->sample_aspect_ratio = in0->sample_aspect_ratio;
312 outlink->frame_rate = in0->frame_rate;
313
314 if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
315 return ret;
316
317 in = s->fs.in;
318 in[0].time_base = in0->time_base;
319 in[1].time_base = in1->time_base;
320 in[0].sync = 1;
321 in[0].before = EXT_STOP;
322 in[0].after = EXT_INFINITY;
323 in[1].sync = 1;
324 in[1].before = EXT_STOP;
325 in[1].after = EXT_INFINITY;
326 s->fs.opaque = s;
327 s->fs.on_event = process_frame;
328
329 return ff_framesync_configure(&s->fs);
330}
331
332static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
333{
334 MidEqualizerContext *s = inlink->dst->priv;
335 return ff_framesync_filter_frame(&s->fs, inlink, buf);
336}
337
338static int request_frame(AVFilterLink *outlink)
339{
340 MidEqualizerContext *s = outlink->src->priv;
341 return ff_framesync_request_frame(&s->fs, outlink);
342}
343
344static av_cold void uninit(AVFilterContext *ctx)
345{
346 MidEqualizerContext *s = ctx->priv;
347
348 ff_framesync_uninit(&s->fs);
349 av_freep(&s->histogram[0]);
350 av_freep(&s->histogram[1]);
351 av_freep(&s->cchange);
352}
353
354static const AVFilterPad midequalizer_inputs[] = {
355 {
356 .name = "in0",
357 .type = AVMEDIA_TYPE_VIDEO,
358 .filter_frame = filter_frame,
359 .config_props = config_input0,
360 },
361 {
362 .name = "in1",
363 .type = AVMEDIA_TYPE_VIDEO,
364 .filter_frame = filter_frame,
365 .config_props = config_input1,
366 },
367 { NULL }
368};
369
370static const AVFilterPad midequalizer_outputs[] = {
371 {
372 .name = "default",
373 .type = AVMEDIA_TYPE_VIDEO,
374 .config_props = config_output,
375 .request_frame = request_frame,
376 },
377 { NULL }
378};
379
380AVFilter ff_vf_midequalizer = {
381 .name = "midequalizer",
382 .description = NULL_IF_CONFIG_SMALL("Apply Midway Equalization."),
383 .priv_size = sizeof(MidEqualizerContext),
384 .uninit = uninit,
385 .query_formats = query_formats,
386 .inputs = midequalizer_inputs,
387 .outputs = midequalizer_outputs,
388 .priv_class = &midequalizer_class,
389 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
390};
391
generated by cgit at 2024-05-17 13:02:56 (GMT)