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vf_colorchannelmixer.c
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1 /*
2  * Copyright (c) 2013 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/opt.h"
22 #include "avfilter.h"
23 #include "drawutils.h"
24 #include "formats.h"
25 #include "internal.h"
26 #include "video.h"
27 
28 #define R 0
29 #define G 1
30 #define B 2
31 #define A 3
32 
33 typedef struct {
34  const AVClass *class;
35  double rr, rg, rb, ra;
36  double gr, gg, gb, ga;
37  double br, bg, bb, ba;
38  double ar, ag, ab, aa;
39 
40  int *lut[4][4];
41 
42  int *buffer;
43 
44  uint8_t rgba_map[4];
45 } ColorChannelMixerContext;
46 
47 #define OFFSET(x) offsetof(ColorChannelMixerContext, x)
48 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
49 static const AVOption colorchannelmixer_options[] = {
50  { "rr", "set the red gain for the red channel", OFFSET(rr), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
51  { "rg", "set the green gain for the red channel", OFFSET(rg), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
52  { "rb", "set the blue gain for the red channel", OFFSET(rb), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
53  { "ra", "set the alpha gain for the red channel", OFFSET(ra), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
54  { "gr", "set the red gain for the green channel", OFFSET(gr), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
55  { "gg", "set the green gain for the green channel", OFFSET(gg), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
56  { "gb", "set the blue gain for the green channel", OFFSET(gb), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
57  { "ga", "set the alpha gain for the green channel", OFFSET(ga), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
58  { "br", "set the red gain for the blue channel", OFFSET(br), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
59  { "bg", "set the green gain for the blue channel", OFFSET(bg), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
60  { "bb", "set the blue gain for the blue channel", OFFSET(bb), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
61  { "ba", "set the alpha gain for the blue channel", OFFSET(ba), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
62  { "ar", "set the red gain for the alpha channel", OFFSET(ar), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
63  { "ag", "set the green gain for the alpha channel", OFFSET(ag), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
64  { "ab", "set the blue gain for the alpha channel", OFFSET(ab), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -2, 2, FLAGS },
65  { "aa", "set the alpha gain for the alpha channel", OFFSET(aa), AV_OPT_TYPE_DOUBLE, {.dbl=1}, -2, 2, FLAGS },
66  { NULL }
67 };
68 
69 AVFILTER_DEFINE_CLASS(colorchannelmixer);
70 
71 static int query_formats(AVFilterContext *ctx)
72 {
73  static const enum AVPixelFormat pix_fmts[] = {
74  AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
75  AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
76  AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
77  AV_PIX_FMT_0RGB, AV_PIX_FMT_0BGR,
78  AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
79  AV_PIX_FMT_RGB48, AV_PIX_FMT_BGR48,
80  AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64,
81  AV_PIX_FMT_NONE
82  };
83 
84  ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
85  return 0;
86 }
87 
88 static int config_output(AVFilterLink *outlink)
89 {
90  AVFilterContext *ctx = outlink->src;
91  ColorChannelMixerContext *cm = ctx->priv;
92  int i, j, size, *buffer;
93 
94  ff_fill_rgba_map(cm->rgba_map, outlink->format);
95 
96  switch (outlink->format) {
97  case AV_PIX_FMT_RGB48:
98  case AV_PIX_FMT_BGR48:
99  case AV_PIX_FMT_RGBA64:
100  case AV_PIX_FMT_BGRA64:
101  size = 65536;
102  break;
103  default:
104  size = 256;
105  }
106 
107  cm->buffer = buffer = av_malloc(16 * size * sizeof(*cm->buffer));
108  if (!cm->buffer)
109  return AVERROR(ENOMEM);
110 
111  for (i = 0; i < 4; i++)
112  for (j = 0; j < 4; j++, buffer += size)
113  cm->lut[i][j] = buffer;
114 
115  for (i = 0; i < size; i++) {
116  cm->lut[R][R][i] = round(i * cm->rr);
117  cm->lut[R][G][i] = round(i * cm->rg);
118  cm->lut[R][B][i] = round(i * cm->rb);
119  cm->lut[R][A][i] = round(i * cm->ra);
120 
121  cm->lut[G][R][i] = round(i * cm->gr);
122  cm->lut[G][G][i] = round(i * cm->gg);
123  cm->lut[G][B][i] = round(i * cm->gb);
124  cm->lut[G][A][i] = round(i * cm->ga);
125 
126  cm->lut[B][R][i] = round(i * cm->br);
127  cm->lut[B][G][i] = round(i * cm->bg);
128  cm->lut[B][B][i] = round(i * cm->bb);
129  cm->lut[B][A][i] = round(i * cm->ba);
130 
131  cm->lut[A][R][i] = round(i * cm->ar);
132  cm->lut[A][G][i] = round(i * cm->ag);
133  cm->lut[A][B][i] = round(i * cm->ab);
134  cm->lut[A][A][i] = round(i * cm->aa);
135  }
136 
137  return 0;
138 }
139 
140 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
141 {
142  AVFilterContext *ctx = inlink->dst;
143  ColorChannelMixerContext *cm = ctx->priv;
144  AVFilterLink *outlink = ctx->outputs[0];
145  const uint8_t roffset = cm->rgba_map[R];
146  const uint8_t goffset = cm->rgba_map[G];
147  const uint8_t boffset = cm->rgba_map[B];
148  const uint8_t aoffset = cm->rgba_map[A];
149  const uint8_t *srcrow = in->data[0];
150  uint8_t *dstrow;
151  AVFrame *out;
152  int i, j;
153 
154  if (av_frame_is_writable(in)) {
155  out = in;
156  } else {
157  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
158  if (!out) {
159  av_frame_free(&in);
160  return AVERROR(ENOMEM);
161  }
162  av_frame_copy_props(out, in);
163  }
164 
165  dstrow = out->data[0];
166  switch (outlink->format) {
167  case AV_PIX_FMT_BGR24:
168  case AV_PIX_FMT_RGB24:
169  for (i = 0; i < outlink->h; i++) {
170  const uint8_t *src = srcrow;
171  uint8_t *dst = dstrow;
172 
173  for (j = 0; j < outlink->w * 3; j += 3) {
174  const uint8_t rin = src[j + roffset];
175  const uint8_t gin = src[j + goffset];
176  const uint8_t bin = src[j + boffset];
177 
178  dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
179  cm->lut[R][G][gin] +
180  cm->lut[R][B][bin]);
181  dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
182  cm->lut[G][G][gin] +
183  cm->lut[G][B][bin]);
184  dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
185  cm->lut[B][G][gin] +
186  cm->lut[B][B][bin]);
187  }
188 
189  srcrow += in->linesize[0];
190  dstrow += out->linesize[0];
191  }
192  break;
193  case AV_PIX_FMT_0BGR:
194  case AV_PIX_FMT_0RGB:
195  case AV_PIX_FMT_BGR0:
196  case AV_PIX_FMT_RGB0:
197  for (i = 0; i < outlink->h; i++) {
198  const uint8_t *src = srcrow;
199  uint8_t *dst = dstrow;
200 
201  for (j = 0; j < outlink->w * 4; j += 4) {
202  const uint8_t rin = src[j + roffset];
203  const uint8_t gin = src[j + goffset];
204  const uint8_t bin = src[j + boffset];
205 
206  dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
207  cm->lut[R][G][gin] +
208  cm->lut[R][B][bin]);
209  dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
210  cm->lut[G][G][gin] +
211  cm->lut[G][B][bin]);
212  dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
213  cm->lut[B][G][gin] +
214  cm->lut[B][B][bin]);
215  if (in != out)
216  dst[j + aoffset] = 0;
217  }
218 
219  srcrow += in->linesize[0];
220  dstrow += out->linesize[0];
221  }
222  break;
223  case AV_PIX_FMT_ABGR:
224  case AV_PIX_FMT_ARGB:
225  case AV_PIX_FMT_BGRA:
226  case AV_PIX_FMT_RGBA:
227  for (i = 0; i < outlink->h; i++) {
228  const uint8_t *src = srcrow;
229  uint8_t *dst = dstrow;
230 
231  for (j = 0; j < outlink->w * 4; j += 4) {
232  const uint8_t rin = src[j + roffset];
233  const uint8_t gin = src[j + goffset];
234  const uint8_t bin = src[j + boffset];
235  const uint8_t ain = src[j + aoffset];
236 
237  dst[j + roffset] = av_clip_uint8(cm->lut[R][R][rin] +
238  cm->lut[R][G][gin] +
239  cm->lut[R][B][bin] +
240  cm->lut[R][A][ain]);
241  dst[j + goffset] = av_clip_uint8(cm->lut[G][R][rin] +
242  cm->lut[G][G][gin] +
243  cm->lut[G][B][bin] +
244  cm->lut[G][A][ain]);
245  dst[j + boffset] = av_clip_uint8(cm->lut[B][R][rin] +
246  cm->lut[B][G][gin] +
247  cm->lut[B][B][bin] +
248  cm->lut[B][A][ain]);
249  dst[j + aoffset] = av_clip_uint8(cm->lut[A][R][rin] +
250  cm->lut[A][G][gin] +
251  cm->lut[A][B][bin] +
252  cm->lut[A][A][ain]);
253  }
254 
255  srcrow += in->linesize[0];
256  dstrow += out->linesize[0];
257  }
258  break;
259  case AV_PIX_FMT_BGR48:
260  case AV_PIX_FMT_RGB48:
261  for (i = 0; i < outlink->h; i++) {
262  const uint16_t *src = (const uint16_t *)srcrow;
263  uint16_t *dst = (uint16_t *)dstrow;
264 
265  for (j = 0; j < outlink->w * 3; j += 3) {
266  const uint16_t rin = src[j + roffset];
267  const uint16_t gin = src[j + goffset];
268  const uint16_t bin = src[j + boffset];
269 
270  dst[j + roffset] = av_clip_uint16(cm->lut[R][R][rin] +
271  cm->lut[R][G][gin] +
272  cm->lut[R][B][bin]);
273  dst[j + goffset] = av_clip_uint16(cm->lut[G][R][rin] +
274  cm->lut[G][G][gin] +
275  cm->lut[G][B][bin]);
276  dst[j + boffset] = av_clip_uint16(cm->lut[B][R][rin] +
277  cm->lut[B][G][gin] +
278  cm->lut[B][B][bin]);
279  }
280 
281  srcrow += in->linesize[0];
282  dstrow += out->linesize[0];
283  }
284  break;
285  case AV_PIX_FMT_BGRA64:
286  case AV_PIX_FMT_RGBA64:
287  for (i = 0; i < outlink->h; i++) {
288  const uint16_t *src = (const uint16_t *)srcrow;
289  uint16_t *dst = (uint16_t *)dstrow;
290 
291  for (j = 0; j < outlink->w * 4; j += 4) {
292  const uint16_t rin = src[j + roffset];
293  const uint16_t gin = src[j + goffset];
294  const uint16_t bin = src[j + boffset];
295  const uint16_t ain = src[j + aoffset];
296 
297  dst[j + roffset] = av_clip_uint16(cm->lut[R][R][rin] +
298  cm->lut[R][G][gin] +
299  cm->lut[R][B][bin] +
300  cm->lut[R][A][ain]);
301  dst[j + goffset] = av_clip_uint16(cm->lut[G][R][rin] +
302  cm->lut[G][G][gin] +
303  cm->lut[G][B][bin] +
304  cm->lut[G][A][ain]);
305  dst[j + boffset] = av_clip_uint16(cm->lut[B][R][rin] +
306  cm->lut[B][G][gin] +
307  cm->lut[B][B][bin] +
308  cm->lut[B][A][ain]);
309  dst[j + aoffset] = av_clip_uint16(cm->lut[A][R][rin] +
310  cm->lut[A][G][gin] +
311  cm->lut[A][B][bin] +
312  cm->lut[A][A][ain]);
313  }
314 
315  srcrow += in->linesize[0];
316  dstrow += out->linesize[0];
317  }
318  }
319 
320  if (in != out)
321  av_frame_free(&in);
322  return ff_filter_frame(ctx->outputs[0], out);
323 }
324 
325 static av_cold void uninit(AVFilterContext *ctx)
326 {
327  ColorChannelMixerContext *cm = ctx->priv;
328 
329  av_freep(&cm->buffer);
330 }
331 
332 static const AVFilterPad colorchannelmixer_inputs[] = {
333  {
334  .name = "default",
335  .type = AVMEDIA_TYPE_VIDEO,
336  .filter_frame = filter_frame,
337  },
338  { NULL }
339 };
340 
341 static const AVFilterPad colorchannelmixer_outputs[] = {
342  {
343  .name = "default",
344  .type = AVMEDIA_TYPE_VIDEO,
345  .config_props = config_output,
346  },
347  { NULL }
348 };
349 
350 AVFilter avfilter_vf_colorchannelmixer = {
351  .name = "colorchannelmixer",
352  .description = NULL_IF_CONFIG_SMALL("Adjust colors by mixing color channels."),
353  .priv_size = sizeof(ColorChannelMixerContext),
354  .priv_class = &colorchannelmixer_class,
355  .uninit = uninit,
356  .query_formats = query_formats,
357  .inputs = colorchannelmixer_inputs,
358  .outputs = colorchannelmixer_outputs,
359  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
360 };
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