FFmpeg: libavfilter/vf_lut.c Source File

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libavfilter

vf_lut.c

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1 /*

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 */

21 /**

22 * @file

23 * Compute a look-up table for binding the input value to the output

24 * value, and apply it to input video.

25 */

27 #include "libavutil/attributes.h"

28 #include "libavutil/common.h"

29 #include "libavutil/eval.h"

30 #include "libavutil/opt.h"

31 #include "libavutil/pixdesc.h"

32 #include "avfilter.h"

33 #include "drawutils.h"

34 #include "formats.h"

35 #include "internal.h"

36 #include "video.h"

38 static const char *const var_names[] = {

39 "w", ///< width of the input video

40 "h", ///< height of the input video

41 "val", ///< input value for the pixel

42 "maxval", ///< max value for the pixel

43 "minval", ///< min value for the pixel

44 "negval", ///< negated value

45 "clipval",

46 NULL

47 };

49 enum var_name {

50 VAR_W,

51 VAR_H,

52 VAR_VAL,

53 VAR_MAXVAL,

54 VAR_MINVAL,

55 VAR_NEGVAL,

56 VAR_CLIPVAL,

57 VAR_VARS_NB

58 };

60 typedef struct LutContext {

61 const AVClass *class;

62 uint8_t lut[4][256]; ///< lookup table for each component

63 char *comp_expr_str[4];

64 AVExpr *comp_expr[4];

65 int hsub, vsub;

66 double var_values[VAR_VARS_NB];

67 int is_rgb, is_yuv;

68 int step;

69 int negate_alpha; /* only used by negate */

70 } LutContext;

72 #define Y 0

73 #define U 1

74 #define V 2

75 #define R 0

76 #define G 1

77 #define B 2

78 #define A 3

80 #define OFFSET(x) offsetof(LutContext, x)

81 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

83 static const AVOption options[] = {

84 { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

85 { "c1", "set component #1 expression", OFFSET(comp_expr_str[1]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

86 { "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

87 { "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

88 { "y", "set Y expression", OFFSET(comp_expr_str[Y]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

89 { "u", "set U expression", OFFSET(comp_expr_str[U]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

90 { "v", "set V expression", OFFSET(comp_expr_str[V]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

91 { "r", "set R expression", OFFSET(comp_expr_str[R]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

92 { "g", "set G expression", OFFSET(comp_expr_str[G]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

93 { "b", "set B expression", OFFSET(comp_expr_str[B]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

94 { "a", "set A expression", OFFSET(comp_expr_str[A]), AV_OPT_TYPE_STRING, { .str = "val" }, .flags = FLAGS },

95 { NULL }

96 };

98 static av_cold void uninit(AVFilterContext *ctx)

99 {

100 LutContext *s = ctx->priv;

101 int i;

102

103 for (i = 0; i < 4; i++) {

104 av_expr_free(s->comp_expr[i]);

105 s->comp_expr[i] = NULL;

106 av_freep(&s->comp_expr_str[i]);

107 }

108 }

109

110 #define YUV_FORMATS \

111 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, \

112 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, \

113 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, \

114 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, \

115 AV_PIX_FMT_YUVJ440P

116

117 #define RGB_FORMATS \

118 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, \

119 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, \

120 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24

121

122 static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };

123 static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };

124 static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };

125

126 static int query_formats(AVFilterContext *ctx)

127 {

128 LutContext *s = ctx->priv;

129

130 const enum AVPixelFormat *pix_fmts = s->is_rgb ? rgb_pix_fmts :

131 s->is_yuv ? yuv_pix_fmts :

132 all_pix_fmts;

133

134 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

135 return 0;

136 }

137

138 /**

139 * Clip value val in the minval - maxval range.

140 */

141 static double clip(void *opaque, double val)

142 {

143 LutContext *s = opaque;

144 double minval = s->var_values[VAR_MINVAL];

145 double maxval = s->var_values[VAR_MAXVAL];

146

147 return av_clip(val, minval, maxval);

148 }

149

150 /**

151 * Compute gamma correction for value val, assuming the minval-maxval

152 * range, val is clipped to a value contained in the same interval.

153 */

154 static double compute_gammaval(void *opaque, double gamma)

155 {

156 LutContext *s = opaque;

157 double val = s->var_values[VAR_CLIPVAL];

158 double minval = s->var_values[VAR_MINVAL];

159 double maxval = s->var_values[VAR_MAXVAL];

160

161 return pow((val-minval)/(maxval-minval), gamma) * (maxval-minval)+minval;

162 }

163

164 /**

165 * Compute ITU Rec.709 gamma correction of value val.

166 */

167 static double compute_gammaval709(void *opaque, double gamma)

168 {

169 LutContext *s = opaque;

170 double val = s->var_values[VAR_CLIPVAL];

171 double minval = s->var_values[VAR_MINVAL];

172 double maxval = s->var_values[VAR_MAXVAL];

173 double level = (val - minval) / (maxval - minval);

174 level = level < 0.018 ? 4.5 * level

175 : 1.099 * pow(level, 1.0 / gamma) - 0.099;

176 return level * (maxval - minval) + minval;

177 }

178

179 static double (* const funcs1[])(void *, double) = {

180 (void *)clip,

181 (void *)compute_gammaval,

182 (void *)compute_gammaval709,

183 NULL

184 };

185

186 static const char * const funcs1_names[] = {

187 "clip",

188 "gammaval",

189 "gammaval709",

190 NULL

191 };

192

193 static int config_props(AVFilterLink *inlink)

194 {

195 AVFilterContext *ctx = inlink->dst;

196 LutContext *s = ctx->priv;

197 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);

198 uint8_t rgba_map[4]; /* component index -> RGBA color index map */

199 int min[4], max[4];

200 int val, color, ret;

201

202 s->hsub = desc->log2_chroma_w;

203 s->vsub = desc->log2_chroma_h;

204

205 s->var_values[VAR_W] = inlink->w;

206 s->var_values[VAR_H] = inlink->h;

207

208 switch (inlink->format) {

209 case AV_PIX_FMT_YUV410P:

210 case AV_PIX_FMT_YUV411P:

211 case AV_PIX_FMT_YUV420P:

212 case AV_PIX_FMT_YUV422P:

213 case AV_PIX_FMT_YUV440P:

214 case AV_PIX_FMT_YUV444P:

215 case AV_PIX_FMT_YUVA420P:

216 case AV_PIX_FMT_YUVA422P:

217 case AV_PIX_FMT_YUVA444P:

218 min[Y] = min[U] = min[V] = 16;

219 max[Y] = 235;

220 max[U] = max[V] = 240;

221 min[A] = 0; max[A] = 255;

222 break;

223 default:

224 min[0] = min[1] = min[2] = min[3] = 0;

225 max[0] = max[1] = max[2] = max[3] = 255;

226 }

227

228 s->is_yuv = s->is_rgb = 0;

229 if (ff_fmt_is_in(inlink->format, yuv_pix_fmts)) s->is_yuv = 1;

230 else if (ff_fmt_is_in(inlink->format, rgb_pix_fmts)) s->is_rgb = 1;

231

232 if (s->is_rgb) {

233 ff_fill_rgba_map(rgba_map, inlink->format);

234 s->step = av_get_bits_per_pixel(desc) >> 3;

235 }

236

237 for (color = 0; color < desc->nb_components; color++) {

238 double res;

239 int comp = s->is_rgb ? rgba_map[color] : color;

240

241 /* create the parsed expression */

242 av_expr_free(s->comp_expr[color]);

243 s->comp_expr[color] = NULL;

244 ret = av_expr_parse(&s->comp_expr[color], s->comp_expr_str[color],

245 var_names, funcs1_names, funcs1, NULL, NULL, 0, ctx);

246 if (ret < 0) {

247 av_log(ctx, AV_LOG_ERROR,

248 "Error when parsing the expression '%s' for the component %d and color %d.\n",

249 s->comp_expr_str[comp], comp, color);

250 return AVERROR(EINVAL);

251 }

252

253 /* compute the lut */

254 s->var_values[VAR_MAXVAL] = max[color];

255 s->var_values[VAR_MINVAL] = min[color];

256

257 for (val = 0; val < 256; val++) {

258 s->var_values[VAR_VAL] = val;

259 s->var_values[VAR_CLIPVAL] = av_clip(val, min[color], max[color]);

260 s->var_values[VAR_NEGVAL] =

261 av_clip(min[color] + max[color] - s->var_values[VAR_VAL],

262 min[color], max[color]);

263

264 res = av_expr_eval(s->comp_expr[color], s->var_values, s);

265 if (isnan(res)) {

266 av_log(ctx, AV_LOG_ERROR,

267 "Error when evaluating the expression '%s' for the value %d for the component %d.\n",

268 s->comp_expr_str[color], val, comp);

269 return AVERROR(EINVAL);

270 }

271 s->lut[comp][val] = av_clip((int)res, min[color], max[color]);

272 av_log(ctx, AV_LOG_DEBUG, "val[%d][%d] = %d\n", comp, val, s->lut[comp][val]);

273 }

274 }

275

276 return 0;

277 }

278

279 static int filter_frame(AVFilterLink *inlink, AVFrame *in)

280 {

281 AVFilterContext *ctx = inlink->dst;

282 LutContext *s = ctx->priv;

283 AVFilterLink *outlink = ctx->outputs[0];

284 AVFrame *out;

285 uint8_t *inrow, *outrow, *inrow0, *outrow0;

286 int i, j, plane, direct = 0;

287

288 if (av_frame_is_writable(in)) {

289 direct = 1;

290 out = in;

291 } else {

292 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

293 if (!out) {

294 av_frame_free(&in);

295 return AVERROR(ENOMEM);

296 }

297 av_frame_copy_props(out, in);

298 }

299

300 if (s->is_rgb) {

301 /* packed */

302 const int w = inlink->w;

303 const int h = in->height;

304 const uint8_t (*tab)[256] = (const uint8_t (*)[256])s->lut;

305 const int in_linesize = in->linesize[0];

306 const int out_linesize = out->linesize[0];

307 const int step = s->step;

308

309 inrow0 = in ->data[0];

310 outrow0 = out->data[0];

311

312 for (i = 0; i < h; i ++) {

313 inrow = inrow0;

314 outrow = outrow0;

315 for (j = 0; j < w; j++) {

316 switch (step) {

317 case 4: outrow[3] = tab[3][inrow[3]]; // Fall-through

318 case 3: outrow[2] = tab[2][inrow[2]]; // Fall-through

319 case 2: outrow[1] = tab[1][inrow[1]]; // Fall-through

320 default: outrow[0] = tab[0][inrow[0]];

321 }

322 outrow += step;

323 inrow += step;

324 }

325 inrow0 += in_linesize;

326 outrow0 += out_linesize;

327 }

328 } else {

329 /* planar */

330 for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {

331 int vsub = plane == 1 || plane == 2 ? s->vsub : 0;

332 int hsub = plane == 1 || plane == 2 ? s->hsub : 0;

333 int h = FF_CEIL_RSHIFT(inlink->h, vsub);

334 int w = FF_CEIL_RSHIFT(inlink->w, hsub);

335 const uint8_t *tab = s->lut[plane];

336 const int in_linesize = in->linesize[plane];

337 const int out_linesize = out->linesize[plane];

338

339 inrow = in ->data[plane];

340 outrow = out->data[plane];

341

342 for (i = 0; i < h; i++) {

343 for (j = 0; j < w; j++)

344 outrow[j] = tab[inrow[j]];

345 inrow += in_linesize;

346 outrow += out_linesize;

347 }

348 }

349 }

350

351 if (!direct)

352 av_frame_free(&in);

353

354 return ff_filter_frame(outlink, out);

355 }

356

357 static const AVFilterPad inputs[] = {

358 { .name = "default",

359 .type = AVMEDIA_TYPE_VIDEO,

360 .filter_frame = filter_frame,

361 .config_props = config_props,

362 },

363 { NULL }

364 };

365 static const AVFilterPad outputs[] = {

366 { .name = "default",

367 .type = AVMEDIA_TYPE_VIDEO,

368 },

369 { NULL }

370 };

371

372 #define DEFINE_LUT_FILTER(name_, description_) \

373 AVFilter ff_vf_##name_ = { \

374 .name = #name_, \

375 .description = NULL_IF_CONFIG_SMALL(description_), \

376 .priv_size = sizeof(LutContext), \

377 .priv_class = &name_ ## _class, \

378 .init = name_##_init, \

379 .uninit = uninit, \

380 .query_formats = query_formats, \

381 .inputs = inputs, \

382 .outputs = outputs, \

383 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, \

384 }

385

386 #if CONFIG_LUT_FILTER

387

388 #define lut_options options

389 AVFILTER_DEFINE_CLASS(lut);

390

391 static int lut_init(AVFilterContext *ctx)

392 {

393 return 0;

394 }

395

396 DEFINE_LUT_FILTER(lut, "Compute and apply a lookup table to the RGB/YUV input video.");

397 #endif

398

399 #if CONFIG_LUTYUV_FILTER

400

401 #define lutyuv_options options

402 AVFILTER_DEFINE_CLASS(lutyuv);

403

404 static av_cold int lutyuv_init(AVFilterContext *ctx)

405 {

406 LutContext *s = ctx->priv;

407

408 s->is_yuv = 1;

409

410 return 0;

411 }

412

413 DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input video.");

414 #endif

415

416 #if CONFIG_LUTRGB_FILTER

417

418 #define lutrgb_options options

419 AVFILTER_DEFINE_CLASS(lutrgb);

420

421 static av_cold int lutrgb_init(AVFilterContext *ctx)

422 {

423 LutContext *s = ctx->priv;

424

425 s->is_rgb = 1;

426

427 return 0;

428 }

429

430 DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.");

431 #endif

432

433 #if CONFIG_NEGATE_FILTER

434

435 static const AVOption negate_options[] = {

436 { "negate_alpha", NULL, OFFSET(negate_alpha), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },

437 { NULL }

438 };

439

440 AVFILTER_DEFINE_CLASS(negate);

441

442 static av_cold int negate_init(AVFilterContext *ctx)

443 {

444 LutContext *s = ctx->priv;

445 int i;

446

447 av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", s->negate_alpha);

448

449 for (i = 0; i < 4; i++) {

450 s->comp_expr_str[i] = av_strdup((i == 3 && !s->negate_alpha) ?

451 "val" : "negval");

452 if (!s->comp_expr_str[i]) {

453 uninit(ctx);

454 return AVERROR(ENOMEM);

455 }

456 }

457

458 return 0;

459 }

460

461 DEFINE_LUT_FILTER(negate, "Negate input video.");

462

463 #endif

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