FFmpeg: libavfilter/vf_blend.c Source File

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libavfilter

vf_blend.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 #include "libavutil/imgutils.h"

22 #include "libavutil/eval.h"

23 #include "libavutil/opt.h"

24 #include "libavutil/pixfmt.h"

25 #include "avfilter.h"

26 #include "bufferqueue.h"

27 #include "formats.h"

28 #include "internal.h"

29 #include "dualinput.h"

30 #include "video.h"

32 #define TOP 0

33 #define BOTTOM 1

35 enum BlendMode {

36 BLEND_UNSET = -1,

37 BLEND_NORMAL,

38 BLEND_ADDITION,

39 BLEND_AND,

40 BLEND_AVERAGE,

41 BLEND_BURN,

42 BLEND_DARKEN,

43 BLEND_DIFFERENCE,

44 BLEND_DIFFERENCE128,

45 BLEND_DIVIDE,

46 BLEND_DODGE,

47 BLEND_EXCLUSION,

48 BLEND_HARDLIGHT,

49 BLEND_LIGHTEN,

50 BLEND_MULTIPLY,

51 BLEND_NEGATION,

52 BLEND_OR,

53 BLEND_OVERLAY,

54 BLEND_PHOENIX,

55 BLEND_PINLIGHT,

56 BLEND_REFLECT,

57 BLEND_SCREEN,

58 BLEND_SOFTLIGHT,

59 BLEND_SUBTRACT,

60 BLEND_VIVIDLIGHT,

61 BLEND_XOR,

62 BLEND_NB

63 };

65 static const char *const var_names[] = { "X", "Y", "W", "H", "SW", "SH", "T", "N", "A", "B", "TOP", "BOTTOM", NULL };

66 enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_SW, VAR_SH, VAR_T, VAR_N, VAR_A, VAR_B, VAR_TOP, VAR_BOTTOM, VAR_VARS_NB };

68 typedef struct FilterParams {

69 enum BlendMode mode;

70 double opacity;

71 AVExpr *e;

72 char *expr_str;

73 void (*blend)(const uint8_t *top, int top_linesize,

74 const uint8_t *bottom, int bottom_linesize,

75 uint8_t *dst, int dst_linesize,

76 int width, int start, int end,

77 struct FilterParams *param, double *values);

78 } FilterParams;

80 typedef struct ThreadData {

81 const AVFrame *top, *bottom;

82 AVFrame *dst;

83 AVFilterLink *inlink;

84 int plane;

85 int w, h;

86 FilterParams *param;

87 } ThreadData;

89 typedef struct {

90 const AVClass *class;

91 FFDualInputContext dinput;

92 int hsub, vsub; ///< chroma subsampling values

93 int nb_planes;

94 char *all_expr;

95 enum BlendMode all_mode;

96 double all_opacity;

98 FilterParams params[4];

99 int tblend;

100 AVFrame *prev_frame; /* only used with tblend */

101 } BlendContext;

102

103 #define COMMON_OPTIONS \

104 { "c0_mode", "set component #0 blend mode", OFFSET(params[0].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

105 { "c1_mode", "set component #1 blend mode", OFFSET(params[1].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

106 { "c2_mode", "set component #2 blend mode", OFFSET(params[2].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

107 { "c3_mode", "set component #3 blend mode", OFFSET(params[3].mode), AV_OPT_TYPE_INT, {.i64=0}, 0, BLEND_NB-1, FLAGS, "mode"},\

108 { "all_mode", "set blend mode for all components", OFFSET(all_mode), AV_OPT_TYPE_INT, {.i64=-1},-1, BLEND_NB-1, FLAGS, "mode"},\

109 { "addition", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_ADDITION}, 0, 0, FLAGS, "mode" },\

110 { "and", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AND}, 0, 0, FLAGS, "mode" },\

111 { "average", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_AVERAGE}, 0, 0, FLAGS, "mode" },\

112 { "burn", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_BURN}, 0, 0, FLAGS, "mode" },\

113 { "darken", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DARKEN}, 0, 0, FLAGS, "mode" },\

114 { "difference", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE}, 0, 0, FLAGS, "mode" },\

115 { "difference128", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIFFERENCE128}, 0, 0, FLAGS, "mode" },\

116 { "divide", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DIVIDE}, 0, 0, FLAGS, "mode" },\

117 { "dodge", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_DODGE}, 0, 0, FLAGS, "mode" },\

118 { "exclusion", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_EXCLUSION}, 0, 0, FLAGS, "mode" },\

119 { "hardlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_HARDLIGHT}, 0, 0, FLAGS, "mode" },\

120 { "lighten", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_LIGHTEN}, 0, 0, FLAGS, "mode" },\

121 { "multiply", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_MULTIPLY}, 0, 0, FLAGS, "mode" },\

122 { "negation", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NEGATION}, 0, 0, FLAGS, "mode" },\

123 { "normal", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_NORMAL}, 0, 0, FLAGS, "mode" },\

124 { "or", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OR}, 0, 0, FLAGS, "mode" },\

125 { "overlay", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_OVERLAY}, 0, 0, FLAGS, "mode" },\

126 { "phoenix", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PHOENIX}, 0, 0, FLAGS, "mode" },\

127 { "pinlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_PINLIGHT}, 0, 0, FLAGS, "mode" },\

128 { "reflect", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_REFLECT}, 0, 0, FLAGS, "mode" },\

129 { "screen", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SCREEN}, 0, 0, FLAGS, "mode" },\

130 { "softlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SOFTLIGHT}, 0, 0, FLAGS, "mode" },\

131 { "subtract", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_SUBTRACT}, 0, 0, FLAGS, "mode" },\

132 { "vividlight", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_VIVIDLIGHT}, 0, 0, FLAGS, "mode" },\

133 { "xor", "", 0, AV_OPT_TYPE_CONST, {.i64=BLEND_XOR}, 0, 0, FLAGS, "mode" },\

134 { "c0_expr", "set color component #0 expression", OFFSET(params[0].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

135 { "c1_expr", "set color component #1 expression", OFFSET(params[1].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

136 { "c2_expr", "set color component #2 expression", OFFSET(params[2].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

137 { "c3_expr", "set color component #3 expression", OFFSET(params[3].expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

138 { "all_expr", "set expression for all color components", OFFSET(all_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },\

139 { "c0_opacity", "set color component #0 opacity", OFFSET(params[0].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

140 { "c1_opacity", "set color component #1 opacity", OFFSET(params[1].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

141 { "c2_opacity", "set color component #2 opacity", OFFSET(params[2].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

142 { "c3_opacity", "set color component #3 opacity", OFFSET(params[3].opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS },\

143 { "all_opacity", "set opacity for all color components", OFFSET(all_opacity), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, FLAGS}

144

145 #define OFFSET(x) offsetof(BlendContext, x)

146 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

147

148 static const AVOption blend_options[] = {

149 COMMON_OPTIONS,

150 { "shortest", "force termination when the shortest input terminates", OFFSET(dinput.shortest), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },

151 { "repeatlast", "repeat last bottom frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },

152 { NULL }

153 };

154

155 AVFILTER_DEFINE_CLASS(blend);

156

157 static void blend_normal(const uint8_t *top, int top_linesize,

158 const uint8_t *bottom, int bottom_linesize,

159 uint8_t *dst, int dst_linesize,

160 int width, int start, int end,

161 FilterParams *param, double *values)

162 {

163 av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start);

164 }

165

166 #define DEFINE_BLEND(name, expr) \

167 static void blend_## name(const uint8_t *top, int top_linesize, \

168 const uint8_t *bottom, int bottom_linesize, \

169 uint8_t *dst, int dst_linesize, \

170 int width, int start, int end, \

171 FilterParams *param, double *values) \

172 { \

173 double opacity = param->opacity; \

174 int i, j; \

175 \

176 for (i = start; i < end; i++) { \

177 for (j = 0; j < width; j++) { \

178 dst[j] = top[j] + ((expr) - top[j]) * opacity; \

179 } \

180 dst += dst_linesize; \

181 top += top_linesize; \

182 bottom += bottom_linesize; \

183 } \

184 }

185

186 #define A top[j]

187 #define B bottom[j]

188

189 #define MULTIPLY(x, a, b) ((x) * (((a) * (b)) / 255))

190 #define SCREEN(x, a, b) (255 - (x) * ((255 - (a)) * (255 - (b)) / 255))

191 #define BURN(a, b) (((a) == 0) ? (a) : FFMAX(0, 255 - ((255 - (b)) << 8) / (a)))

192 #define DODGE(a, b) (((a) == 255) ? (a) : FFMIN(255, (((b) << 8) / (255 - (a)))))

193

194 DEFINE_BLEND(addition, FFMIN(255, A + B))

195 DEFINE_BLEND(average, (A + B) / 2)

196 DEFINE_BLEND(subtract, FFMAX(0, A - B))

197 DEFINE_BLEND(multiply, MULTIPLY(1, A, B))

198 DEFINE_BLEND(negation, 255 - FFABS(255 - A - B))

199 DEFINE_BLEND(difference, FFABS(A - B))

200 DEFINE_BLEND(difference128, av_clip_uint8(128 + A - B))

201 DEFINE_BLEND(screen, SCREEN(1, A, B))

202 DEFINE_BLEND(overlay, (A < 128) ? MULTIPLY(2, A, B) : SCREEN(2, A, B))

203 DEFINE_BLEND(hardlight, (B < 128) ? MULTIPLY(2, B, A) : SCREEN(2, B, A))

204 DEFINE_BLEND(darken, FFMIN(A, B))

205 DEFINE_BLEND(lighten, FFMAX(A, B))

206 DEFINE_BLEND(divide, ((float)A / ((float)B) * 255))

207 DEFINE_BLEND(dodge, DODGE(A, B))

208 DEFINE_BLEND(burn, BURN(A, B))

209 DEFINE_BLEND(softlight, (A > 127) ? B + (255 - B) * (A - 127.5) / 127.5 * (0.5 - FFABS(B - 127.5) / 255): B - B * ((127.5 - A) / 127.5) * (0.5 - FFABS(B - 127.5)/255))

210 DEFINE_BLEND(exclusion, A + B - 2 * A * B / 255)

211 DEFINE_BLEND(pinlight, (B < 128) ? FFMIN(A, 2 * B) : FFMAX(A, 2 * (B - 128)))

212 DEFINE_BLEND(phoenix, FFMIN(A, B) - FFMAX(A, B) + 255)

213 DEFINE_BLEND(reflect, (B == 255) ? B : FFMIN(255, (A * A / (255 - B))))

214 DEFINE_BLEND(and, A & B)

215 DEFINE_BLEND(or, A | B)

216 DEFINE_BLEND(xor, A ^ B)

217 DEFINE_BLEND(vividlight, (B < 128) ? BURN(A, 2 * B) : DODGE(A, 2 * (B - 128)))

218

219 static void blend_expr(const uint8_t *top, int top_linesize,

220 const uint8_t *bottom, int bottom_linesize,

221 uint8_t *dst, int dst_linesize,

222 int width, int start, int end,

223 FilterParams *param, double *values)

224 {

225 AVExpr *e = param->e;

226 int y, x;

227

228 for (y = start; y < end; y++) {

229 values[VAR_Y] = y;

230 for (x = 0; x < width; x++) {

231 values[VAR_X] = x;

232 values[VAR_TOP] = values[VAR_A] = top[x];

233 values[VAR_BOTTOM] = values[VAR_B] = bottom[x];

234 dst[x] = av_expr_eval(e, values, NULL);

235 }

236 dst += dst_linesize;

237 top += top_linesize;

238 bottom += bottom_linesize;

239 }

240 }

241

242 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

243 {

244 ThreadData *td = arg;

245 int slice_start = (td->h * jobnr ) / nb_jobs;

246 int slice_end = (td->h * (jobnr+1)) / nb_jobs;

247 const uint8_t *top = td->top->data[td->plane];

248 const uint8_t *bottom = td->bottom->data[td->plane];

249 uint8_t *dst = td->dst->data[td->plane];

250 double values[VAR_VARS_NB];

251

252 values[VAR_N] = td->inlink->frame_count;

253 values[VAR_T] = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);

254 values[VAR_W] = td->w;

255 values[VAR_H] = td->h;

256 values[VAR_SW] = td->w / (double)td->dst->width;

257 values[VAR_SH] = td->h / (double)td->dst->height;

258

259 td->param->blend(top + slice_start * td->top->linesize[td->plane],

260 td->top->linesize[td->plane],

261 bottom + slice_start * td->bottom->linesize[td->plane],

262 td->bottom->linesize[td->plane],

263 dst + slice_start * td->dst->linesize[td->plane],

264 td->dst->linesize[td->plane],

265 td->w, slice_start, slice_end, td->param, &values[0]);

266 return 0;

267 }

268

269 static AVFrame *blend_frame(AVFilterContext *ctx, AVFrame *top_buf,

270 const AVFrame *bottom_buf)

271 {

272 BlendContext *b = ctx->priv;

273 AVFilterLink *inlink = ctx->inputs[0];

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

275 AVFrame *dst_buf;

276 int plane;

277

278 dst_buf = ff_get_video_buffer(outlink, outlink->w, outlink->h);

279 if (!dst_buf)

280 return top_buf;

281 av_frame_copy_props(dst_buf, top_buf);

282

283 for (plane = 0; plane < b->nb_planes; plane++) {

284 int hsub = plane == 1 || plane == 2 ? b->hsub : 0;

285 int vsub = plane == 1 || plane == 2 ? b->vsub : 0;

286 int outw = FF_CEIL_RSHIFT(dst_buf->width, hsub);

287 int outh = FF_CEIL_RSHIFT(dst_buf->height, vsub);

288 FilterParams *param = &b->params[plane];

289 ThreadData td = { .top = top_buf, .bottom = bottom_buf, .dst = dst_buf,

290 .w = outw, .h = outh, .param = param, .plane = plane,

291 .inlink = inlink };

292

293 ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outh, ctx->graph->nb_threads));

294 }

295

296 if (!b->tblend)

297 av_frame_free(&top_buf);

298

299 return dst_buf;

300 }

301

302 static av_cold int init(AVFilterContext *ctx)

303 {

304 BlendContext *b = ctx->priv;

305 int ret, plane;

306

307 b->tblend = !strcmp(ctx->filter->name, "tblend");

308

309 for (plane = 0; plane < FF_ARRAY_ELEMS(b->params); plane++) {

310 FilterParams *param = &b->params[plane];

311

312 if (b->all_mode >= 0)

313 param->mode = b->all_mode;

314 if (b->all_opacity < 1)

315 param->opacity = b->all_opacity;

316

317 switch (param->mode) {

318 case BLEND_ADDITION: param->blend = blend_addition; break;

319 case BLEND_AND: param->blend = blend_and; break;

320 case BLEND_AVERAGE: param->blend = blend_average; break;

321 case BLEND_BURN: param->blend = blend_burn; break;

322 case BLEND_DARKEN: param->blend = blend_darken; break;

323 case BLEND_DIFFERENCE: param->blend = blend_difference; break;

324 case BLEND_DIFFERENCE128: param->blend = blend_difference128; break;

325 case BLEND_DIVIDE: param->blend = blend_divide; break;

326 case BLEND_DODGE: param->blend = blend_dodge; break;

327 case BLEND_EXCLUSION: param->blend = blend_exclusion; break;

328 case BLEND_HARDLIGHT: param->blend = blend_hardlight; break;

329 case BLEND_LIGHTEN: param->blend = blend_lighten; break;

330 case BLEND_MULTIPLY: param->blend = blend_multiply; break;

331 case BLEND_NEGATION: param->blend = blend_negation; break;

332 case BLEND_NORMAL: param->blend = blend_normal; break;

333 case BLEND_OR: param->blend = blend_or; break;

334 case BLEND_OVERLAY: param->blend = blend_overlay; break;

335 case BLEND_PHOENIX: param->blend = blend_phoenix; break;

336 case BLEND_PINLIGHT: param->blend = blend_pinlight; break;

337 case BLEND_REFLECT: param->blend = blend_reflect; break;

338 case BLEND_SCREEN: param->blend = blend_screen; break;

339 case BLEND_SOFTLIGHT: param->blend = blend_softlight; break;

340 case BLEND_SUBTRACT: param->blend = blend_subtract; break;

341 case BLEND_VIVIDLIGHT: param->blend = blend_vividlight; break;

342 case BLEND_XOR: param->blend = blend_xor; break;

343 }

344

345 if (b->all_expr && !param->expr_str) {

346 param->expr_str = av_strdup(b->all_expr);

347 if (!param->expr_str)

348 return AVERROR(ENOMEM);

349 }

350 if (param->expr_str) {

351 ret = av_expr_parse(&param->e, param->expr_str, var_names,

352 NULL, NULL, NULL, NULL, 0, ctx);

353 if (ret < 0)

354 return ret;

355 param->blend = blend_expr;

356 }

357 }

358

359 b->dinput.process = blend_frame;

360 return 0;

361 }

362

363 static int query_formats(AVFilterContext *ctx)

364 {

365 static const enum AVPixelFormat pix_fmts[] = {

366 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,

367 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,

368 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,

369 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE

370 };

371

372 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

373 return 0;

374 }

375

376 static av_cold void uninit(AVFilterContext *ctx)

377 {

378 BlendContext *b = ctx->priv;

379 int i;

380

381 ff_dualinput_uninit(&b->dinput);

382 av_frame_free(&b->prev_frame);

383

384 for (i = 0; i < FF_ARRAY_ELEMS(b->params); i++)

385 av_expr_free(b->params[i].e);

386 }

387

388 #if CONFIG_BLEND_FILTER

389

390 static int config_output(AVFilterLink *outlink)

391 {

392 AVFilterContext *ctx = outlink->src;

393 AVFilterLink *toplink = ctx->inputs[TOP];

394 AVFilterLink *bottomlink = ctx->inputs[BOTTOM];

395 BlendContext *b = ctx->priv;

396 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(toplink->format);

397 int ret;

398

399 if (toplink->format != bottomlink->format) {

400 av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");

401 return AVERROR(EINVAL);

402 }

403 if (toplink->w != bottomlink->w ||

404 toplink->h != bottomlink->h ||

405 toplink->sample_aspect_ratio.num != bottomlink->sample_aspect_ratio.num ||

406 toplink->sample_aspect_ratio.den != bottomlink->sample_aspect_ratio.den) {

407 av_log(ctx, AV_LOG_ERROR, "First input link %s parameters "

408 "(size %dx%d, SAR %d:%d) do not match the corresponding "

409 "second input link %s parameters (%dx%d, SAR %d:%d)\n",

410 ctx->input_pads[TOP].name, toplink->w, toplink->h,

411 toplink->sample_aspect_ratio.num,

412 toplink->sample_aspect_ratio.den,

413 ctx->input_pads[BOTTOM].name, bottomlink->w, bottomlink->h,

414 bottomlink->sample_aspect_ratio.num,

415 bottomlink->sample_aspect_ratio.den);

416 return AVERROR(EINVAL);

417 }

418

419 outlink->w = toplink->w;

420 outlink->h = toplink->h;

421 outlink->time_base = toplink->time_base;

422 outlink->sample_aspect_ratio = toplink->sample_aspect_ratio;

423 outlink->frame_rate = toplink->frame_rate;

424

425 b->hsub = pix_desc->log2_chroma_w;

426 b->vsub = pix_desc->log2_chroma_h;

427 b->nb_planes = av_pix_fmt_count_planes(toplink->format);

428

429 if ((ret = ff_dualinput_init(ctx, &b->dinput)) < 0)

430 return ret;

431

432 return 0;

433 }

434

435 static int request_frame(AVFilterLink *outlink)

436 {

437 BlendContext *b = outlink->src->priv;

438 return ff_dualinput_request_frame(&b->dinput, outlink);

439 }

440

441 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)

442 {

443 BlendContext *b = inlink->dst->priv;

444 return ff_dualinput_filter_frame(&b->dinput, inlink, buf);

445 }

446

447 static const AVFilterPad blend_inputs[] = {

448 {

449 .name = "top",

450 .type = AVMEDIA_TYPE_VIDEO,

451 .filter_frame = filter_frame,

452 },{

453 .name = "bottom",

454 .type = AVMEDIA_TYPE_VIDEO,

455 .filter_frame = filter_frame,

456 },

457 { NULL }

458 };

459

460 static const AVFilterPad blend_outputs[] = {

461 {

462 .name = "default",

463 .type = AVMEDIA_TYPE_VIDEO,

464 .config_props = config_output,

465 .request_frame = request_frame,

466 },

467 { NULL }

468 };

469

470 AVFilter ff_vf_blend = {

471 .name = "blend",

472 .description = NULL_IF_CONFIG_SMALL("Blend two video frames into each other."),

473 .init = init,

474 .uninit = uninit,

475 .priv_size = sizeof(BlendContext),

476 .query_formats = query_formats,

477 .inputs = blend_inputs,

478 .outputs = blend_outputs,

479 .priv_class = &blend_class,

480 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,

481 };

482

483 #endif

484

485 #if CONFIG_TBLEND_FILTER

486

487 static int tblend_config_output(AVFilterLink *outlink)

488 {

489 AVFilterContext *ctx = outlink->src;

490 AVFilterLink *inlink = ctx->inputs[0];

491 BlendContext *b = ctx->priv;

492 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);

493

494 b->hsub = pix_desc->log2_chroma_w;

495 b->vsub = pix_desc->log2_chroma_h;

496 b->nb_planes = av_pix_fmt_count_planes(inlink->format);

497 outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;

498

499 return 0;

500 }

501

502 static int tblend_filter_frame(AVFilterLink *inlink, AVFrame *frame)

503 {

504 BlendContext *b = inlink->dst->priv;

505 AVFilterLink *outlink = inlink->dst->outputs[0];

506

507 if (b->prev_frame) {

508 AVFrame *out = blend_frame(inlink->dst, frame, b->prev_frame);

509 av_frame_free(&b->prev_frame);

510 b->prev_frame = frame;

511 return ff_filter_frame(outlink, out);

512 }

513 b->prev_frame = frame;

514 return 0;

515 }

516

517 static const AVOption tblend_options[] = {

518 COMMON_OPTIONS,

519 { NULL }

520 };

521

522 AVFILTER_DEFINE_CLASS(tblend);

523

524 static const AVFilterPad tblend_inputs[] = {

525 {

526 .name = "default",

527 .type = AVMEDIA_TYPE_VIDEO,

528 .filter_frame = tblend_filter_frame,

529 },

530 { NULL }

531 };

532

533 static const AVFilterPad tblend_outputs[] = {

534 {

535 .name = "default",

536 .type = AVMEDIA_TYPE_VIDEO,

537 .config_props = tblend_config_output,

538 },

539 { NULL }

540 };

541

542 AVFilter ff_vf_tblend = {

543 .name = "tblend",

544 .description = NULL_IF_CONFIG_SMALL("Blend successive frames."),

545 .priv_size = sizeof(BlendContext),

546 .priv_class = &tblend_class,

547 .query_formats = query_formats,

548 .init = init,

549 .uninit = uninit,

550 .inputs = tblend_inputs,

551 .outputs = tblend_outputs,

552 .flags = AVFILTER_FLAG_SLICE_THREADS,

553 };

554

555 #endif

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