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
30 typedef 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
53 static const AVOption midequalizer_options[] = {
54 { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
55 { NULL }
56 };
57
58 AVFILTER_DEFINE_CLASS(midequalizer);
59
query_formats(AVFilterContext * ctx)60 static 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, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
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_YUVA422P12, AV_PIX_FMT_YUVA444P12,
78 AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
79 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
80 AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
81 AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
82 AV_PIX_FMT_GRAY16,
83 AV_PIX_FMT_NONE
84 };
85
86 return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
87 }
88
process_frame(FFFrameSync * fs)89 static int process_frame(FFFrameSync *fs)
90 {
91 AVFilterContext *ctx = fs->parent;
92 MidEqualizerContext *s = fs->opaque;
93 AVFilterLink *outlink = ctx->outputs[0];
94 AVFrame *out, *in0, *in1;
95 int ret;
96
97 if ((ret = ff_framesync_get_frame(&s->fs, 0, &in0, 0)) < 0 ||
98 (ret = ff_framesync_get_frame(&s->fs, 1, &in1, 0)) < 0)
99 return ret;
100
101 if (ctx->is_disabled) {
102 out = av_frame_clone(in0);
103 if (!out)
104 return AVERROR(ENOMEM);
105 } else {
106 int p;
107
108 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
109 if (!out)
110 return AVERROR(ENOMEM);
111 av_frame_copy_props(out, in0);
112
113 for (p = 0; p < s->nb_planes; p++) {
114 if (!((1 << p) & s->planes)) {
115 av_image_copy_plane(out->data[p], out->linesize[p], in0->data[p], in0->linesize[p],
116 s->width[0][p] * (1 + (s->histogram_size > 256)), s->height[0][p]);
117 continue;
118 }
119
120 s->midequalizer(in0->data[p], in1->data[p],
121 out->data[p],
122 in0->linesize[p], in1->linesize[p],
123 out->linesize[p],
124 s->width[0][p], s->height[0][p],
125 s->width[1][p], s->height[1][p],
126 s->histogram[0], s->histogram[1],
127 s->cchange, s->histogram_size);
128 }
129 }
130 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base);
131
132 return ff_filter_frame(outlink, out);
133 }
134
compute_histogram8(const uint8_t * src,ptrdiff_t linesize,int w,int h,float * histogram,size_t hsize)135 static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
136 int w, int h, float *histogram, size_t hsize)
137 {
138 int y, x;
139
140 memset(histogram, 0, hsize * sizeof(*histogram));
141
142 for (y = 0; y < h; y++) {
143 for (x = 0; x < w; x++) {
144 histogram[src[x]] += 1;
145 }
146 src += linesize;
147 }
148
149 for (x = 0; x < hsize - 1; x++) {
150 histogram[x + 1] += histogram[x];
151 histogram[x] /= hsize;
152 }
153 histogram[x] /= hsize;
154 }
155
compute_histogram16(const uint16_t * src,ptrdiff_t linesize,int w,int h,float * histogram,size_t hsize)156 static void compute_histogram16(const uint16_t *src, ptrdiff_t linesize,
157 int w, int h, float *histogram, size_t hsize)
158 {
159 int y, x;
160
161 memset(histogram, 0, hsize * sizeof(*histogram));
162
163 for (y = 0; y < h; y++) {
164 for (x = 0; x < w; x++) {
165 histogram[src[x]] += 1;
166 }
167 src += linesize;
168 }
169
170 for (x = 0; x < hsize - 1; x++) {
171 histogram[x + 1] += histogram[x];
172 histogram[x] /= hsize;
173 }
174 histogram[x] /= hsize;
175 }
176
compute_contrast_change(float * histogram1,float * histogram2,unsigned * cchange,size_t hsize)177 static void compute_contrast_change(float *histogram1, float *histogram2,
178 unsigned *cchange, size_t hsize)
179 {
180 int i;
181
182 for (i = 0; i < hsize; i++) {
183 int j;
184
185 for (j = 0; j < hsize && histogram2[j] < histogram1[i]; j++);
186
187 cchange[i] = (i + j) / 2;
188 }
189 }
190
midequalizer8(const uint8_t * in0,const uint8_t * in1,uint8_t * dst,ptrdiff_t linesize1,ptrdiff_t linesize2,ptrdiff_t dlinesize,int w0,int h0,int w1,int h1,float * histogram1,float * histogram2,unsigned * cchange,size_t hsize)191 static void midequalizer8(const uint8_t *in0, const uint8_t *in1,
192 uint8_t *dst,
193 ptrdiff_t linesize1, ptrdiff_t linesize2,
194 ptrdiff_t dlinesize,
195 int w0, int h0,
196 int w1, int h1,
197 float *histogram1, float *histogram2,
198 unsigned *cchange,
199 size_t hsize)
200 {
201 int x, y;
202
203 compute_histogram8(in0, linesize1, w0, h0, histogram1, hsize);
204 compute_histogram8(in1, linesize2, w1, h1, histogram2, hsize);
205
206 compute_contrast_change(histogram1, histogram2, cchange, hsize);
207
208 for (y = 0; y < h0; y++) {
209 for (x = 0; x < w0; x++) {
210 dst[x] = av_clip_uint8(cchange[in0[x]]);
211 }
212 dst += dlinesize;
213 in0 += linesize1;
214 }
215 }
216
midequalizer16(const uint8_t * in0,const uint8_t * in1,uint8_t * dst,ptrdiff_t linesize1,ptrdiff_t linesize2,ptrdiff_t dlinesize,int w0,int h0,int w1,int h1,float * histogram1,float * histogram2,unsigned * cchange,size_t hsize)217 static void midequalizer16(const uint8_t *in0, const uint8_t *in1,
218 uint8_t *dst,
219 ptrdiff_t linesize1, ptrdiff_t linesize2,
220 ptrdiff_t dlinesize,
221 int w0, int h0,
222 int w1, int h1,
223 float *histogram1, float *histogram2,
224 unsigned *cchange,
225 size_t hsize)
226 {
227 const uint16_t *i = (const uint16_t *)in0;
228 uint16_t *d = (uint16_t *)dst;
229 int x, y;
230
231 compute_histogram16(i, linesize1 / 2, w0, h0, histogram1, hsize);
232 compute_histogram16((const uint16_t *)in1, linesize2 / 2, w1, h1, histogram2, hsize);
233
234 compute_contrast_change(histogram1, histogram2, cchange, hsize);
235
236 for (y = 0; y < h0; y++) {
237 for (x = 0; x < w0; x++) {
238 d[x] = cchange[i[x]];
239 }
240 d += dlinesize / 2;
241 i += linesize1 / 2;
242 }
243 }
244
config_input0(AVFilterLink * inlink)245 static int config_input0(AVFilterLink *inlink)
246 {
247 AVFilterContext *ctx = inlink->dst;
248 MidEqualizerContext *s = ctx->priv;
249 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
250 int vsub, hsub;
251
252 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
253
254 hsub = desc->log2_chroma_w;
255 vsub = desc->log2_chroma_h;
256
257 s->height[0][0] = s->height[0][3] = inlink->h;
258 s->width[0][0] = s->width[0][3] = inlink->w;
259 s->height[0][1] = s->height[0][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
260 s->width[0][1] = s->width[0][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
261
262 s->histogram_size = 1 << desc->comp[0].depth;
263
264 s->histogram[0] = av_calloc(s->histogram_size, sizeof(float));
265 s->histogram[1] = av_calloc(s->histogram_size, sizeof(float));
266 s->cchange = av_calloc(s->histogram_size, sizeof(unsigned));
267 if (!s->histogram[0] || !s->histogram[1] || !s->cchange)
268 return AVERROR(ENOMEM);
269
270 if (s->histogram_size == 256) {
271 s->midequalizer = midequalizer8;
272 } else {
273 s->midequalizer = midequalizer16;
274 }
275
276 return 0;
277 }
278
config_input1(AVFilterLink * inlink)279 static int config_input1(AVFilterLink *inlink)
280 {
281 AVFilterContext *ctx = inlink->dst;
282 MidEqualizerContext *s = ctx->priv;
283 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
284 int vsub, hsub;
285
286 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
287
288 hsub = desc->log2_chroma_w;
289 vsub = desc->log2_chroma_h;
290
291 s->height[1][0] = s->height[1][3] = inlink->h;
292 s->width[1][0] = s->width[1][3] = inlink->w;
293 s->height[1][1] = s->height[1][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
294 s->width[1][1] = s->width[1][2] = AV_CEIL_RSHIFT(inlink->w, hsub);
295
296 return 0;
297 }
298
config_output(AVFilterLink * outlink)299 static int config_output(AVFilterLink *outlink)
300 {
301 AVFilterContext *ctx = outlink->src;
302 MidEqualizerContext *s = ctx->priv;
303 AVFilterLink *in0 = ctx->inputs[0];
304 AVFilterLink *in1 = ctx->inputs[1];
305 FFFrameSyncIn *in;
306 int ret;
307
308 if (in0->format != in1->format) {
309 av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
310 return AVERROR(EINVAL);
311 }
312
313 outlink->w = in0->w;
314 outlink->h = in0->h;
315 outlink->sample_aspect_ratio = in0->sample_aspect_ratio;
316 outlink->frame_rate = in0->frame_rate;
317
318 if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
319 return ret;
320
321 in = s->fs.in;
322 in[0].time_base = in0->time_base;
323 in[1].time_base = in1->time_base;
324 in[0].sync = 1;
325 in[0].before = EXT_STOP;
326 in[0].after = EXT_INFINITY;
327 in[1].sync = 1;
328 in[1].before = EXT_STOP;
329 in[1].after = EXT_INFINITY;
330 s->fs.opaque = s;
331 s->fs.on_event = process_frame;
332
333 ret = ff_framesync_configure(&s->fs);
334 outlink->time_base = s->fs.time_base;
335
336 return ret;
337 }
338
activate(AVFilterContext * ctx)339 static int activate(AVFilterContext *ctx)
340 {
341 MidEqualizerContext *s = ctx->priv;
342 return ff_framesync_activate(&s->fs);
343 }
344
uninit(AVFilterContext * ctx)345 static av_cold void uninit(AVFilterContext *ctx)
346 {
347 MidEqualizerContext *s = ctx->priv;
348
349 ff_framesync_uninit(&s->fs);
350 av_freep(&s->histogram[0]);
351 av_freep(&s->histogram[1]);
352 av_freep(&s->cchange);
353 }
354
355 static const AVFilterPad midequalizer_inputs[] = {
356 {
357 .name = "in0",
358 .type = AVMEDIA_TYPE_VIDEO,
359 .config_props = config_input0,
360 },
361 {
362 .name = "in1",
363 .type = AVMEDIA_TYPE_VIDEO,
364 .config_props = config_input1,
365 },
366 { NULL }
367 };
368
369 static const AVFilterPad midequalizer_outputs[] = {
370 {
371 .name = "default",
372 .type = AVMEDIA_TYPE_VIDEO,
373 .config_props = config_output,
374 },
375 { NULL }
376 };
377
378 AVFilter ff_vf_midequalizer = {
379 .name = "midequalizer",
380 .description = NULL_IF_CONFIG_SMALL("Apply Midway Equalization."),
381 .priv_size = sizeof(MidEqualizerContext),
382 .uninit = uninit,
383 .query_formats = query_formats,
384 .activate = activate,
385 .inputs = midequalizer_inputs,
386 .outputs = midequalizer_outputs,
387 .priv_class = &midequalizer_class,
388 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
389 };
390