FFmpeg: libavfilter/vf_overlay.c Source File

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libavfilter

vf_overlay.c

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1 /*

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

23 /**

24 * @file

25 * overlay one video on top of another

26 */

28 #include "avfilter.h"

29 #include "formats.h"

30 #include "libavutil/common.h"

31 #include "libavutil/eval.h"

32 #include "libavutil/avstring.h"

33 #include "libavutil/pixdesc.h"

34 #include "libavutil/imgutils.h"

35 #include "libavutil/mathematics.h"

36 #include "libavutil/opt.h"

37 #include "internal.h"

38 #include "dualinput.h"

39 #include "drawutils.h"

40 #include "video.h"

42 static const char *const var_names[] = {

43 "main_w", "W", ///< width of the main video

44 "main_h", "H", ///< height of the main video

45 "overlay_w", "w", ///< width of the overlay video

46 "overlay_h", "h", ///< height of the overlay video

47 "hsub",

48 "vsub",

49 "x",

50 "y",

51 "n", ///< number of frame

52 "pos", ///< position in the file

53 "t", ///< timestamp expressed in seconds

54 NULL

55 };

57 enum var_name {

58 VAR_MAIN_W, VAR_MW,

59 VAR_MAIN_H, VAR_MH,

60 VAR_OVERLAY_W, VAR_OW,

61 VAR_OVERLAY_H, VAR_OH,

62 VAR_HSUB,

63 VAR_VSUB,

64 VAR_X,

65 VAR_Y,

66 VAR_N,

67 VAR_POS,

68 VAR_T,

69 VAR_VARS_NB

70 };

72 #define MAIN 0

73 #define OVERLAY 1

75 #define R 0

76 #define G 1

77 #define B 2

78 #define A 3

80 #define Y 0

81 #define U 1

82 #define V 2

84 typedef struct {

85 const AVClass *class;

86 int x, y; ///< position of overlayed picture

88 int allow_packed_rgb;

89 uint8_t main_is_packed_rgb;

90 uint8_t main_rgba_map[4];

91 uint8_t main_has_alpha;

92 uint8_t overlay_is_packed_rgb;

93 uint8_t overlay_rgba_map[4];

94 uint8_t overlay_has_alpha;

95 enum OverlayFormat { OVERLAY_FORMAT_YUV420, OVERLAY_FORMAT_YUV444, OVERLAY_FORMAT_RGB, OVERLAY_FORMAT_NB} format;

96 enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;

98 FFDualInputContext dinput;

100 int main_pix_step[4]; ///< steps per pixel for each plane of the main output

101 int overlay_pix_step[4]; ///< steps per pixel for each plane of the overlay

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

103

104 double var_values[VAR_VARS_NB];

105 char *x_expr, *y_expr;

106 AVExpr *x_pexpr, *y_pexpr;

107 } OverlayContext;

108

109 static av_cold void uninit(AVFilterContext *ctx)

110 {

111 OverlayContext *s = ctx->priv;

112

113 ff_dualinput_uninit(&s->dinput);

114 av_expr_free(s->x_pexpr); s->x_pexpr = NULL;

115 av_expr_free(s->y_pexpr); s->y_pexpr = NULL;

116 }

117

118 static inline int normalize_xy(double d, int chroma_sub)

119 {

120 if (isnan(d))

121 return INT_MAX;

122 return (int)d & ~((1 << chroma_sub) - 1);

123 }

124

125 static void eval_expr(AVFilterContext *ctx)

126 {

127 OverlayContext *s = ctx->priv;

128

129 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);

130 s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);

131 s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);

132 s->x = normalize_xy(s->var_values[VAR_X], s->hsub);

133 s->y = normalize_xy(s->var_values[VAR_Y], s->vsub);

134 }

135

136 static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)

137 {

138 int ret;

139 AVExpr *old = NULL;

140

141 if (*pexpr)

142 old = *pexpr;

143 ret = av_expr_parse(pexpr, expr, var_names,

144 NULL, NULL, NULL, NULL, 0, log_ctx);

145 if (ret < 0) {

146 av_log(log_ctx, AV_LOG_ERROR,

147 "Error when evaluating the expression '%s' for %s\n",

148 expr, option);

149 *pexpr = old;

150 return ret;

151 }

152

153 av_expr_free(old);

154 return 0;

155 }

156

157 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

158 char *res, int res_len, int flags)

159 {

160 OverlayContext *s = ctx->priv;

161 int ret;

162

163 if (!strcmp(cmd, "x"))

164 ret = set_expr(&s->x_pexpr, args, cmd, ctx);

165 else if (!strcmp(cmd, "y"))

166 ret = set_expr(&s->y_pexpr, args, cmd, ctx);

167 else

168 ret = AVERROR(ENOSYS);

169

170 if (ret < 0)

171 return ret;

172

173 if (s->eval_mode == EVAL_MODE_INIT) {

174 eval_expr(ctx);

175 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",

176 s->var_values[VAR_X], s->x,

177 s->var_values[VAR_Y], s->y);

178 }

179 return ret;

180 }

181

182 static int query_formats(AVFilterContext *ctx)

183 {

184 OverlayContext *s = ctx->priv;

185

186 /* overlay formats contains alpha, for avoiding conversion with alpha information loss */

187 static const enum AVPixelFormat main_pix_fmts_yuv420[] = {

188 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE

189 };

190 static const enum AVPixelFormat overlay_pix_fmts_yuv420[] = {

191 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE

192 };

193

194 static const enum AVPixelFormat main_pix_fmts_yuv444[] = {

195 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE

196 };

197 static const enum AVPixelFormat overlay_pix_fmts_yuv444[] = {

198 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_NONE

199 };

200

201 static const enum AVPixelFormat main_pix_fmts_rgb[] = {

202 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,

203 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,

204 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,

205 AV_PIX_FMT_NONE

206 };

207 static const enum AVPixelFormat overlay_pix_fmts_rgb[] = {

208 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,

209 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,

210 AV_PIX_FMT_NONE

211 };

212

213 AVFilterFormats *main_formats;

214 AVFilterFormats *overlay_formats;

215

216 switch (s->format) {

217 case OVERLAY_FORMAT_YUV420:

218 main_formats = ff_make_format_list(main_pix_fmts_yuv420);

219 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv420);

220 break;

221 case OVERLAY_FORMAT_YUV444:

222 main_formats = ff_make_format_list(main_pix_fmts_yuv444);

223 overlay_formats = ff_make_format_list(overlay_pix_fmts_yuv444);

224 break;

225 case OVERLAY_FORMAT_RGB:

226 main_formats = ff_make_format_list(main_pix_fmts_rgb);

227 overlay_formats = ff_make_format_list(overlay_pix_fmts_rgb);

228 break;

229 default:

230 av_assert0(0);

231 }

232

233 ff_formats_ref(main_formats, &ctx->inputs [MAIN ]->out_formats);

234 ff_formats_ref(overlay_formats, &ctx->inputs [OVERLAY]->out_formats);

235 ff_formats_ref(main_formats, &ctx->outputs[MAIN ]->in_formats );

236

237 return 0;

238 }

239

240 static const enum AVPixelFormat alpha_pix_fmts[] = {

241 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA444P,

242 AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR, AV_PIX_FMT_RGBA,

243 AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE

244 };

245

246 static int config_input_main(AVFilterLink *inlink)

247 {

248 OverlayContext *s = inlink->dst->priv;

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

250

251 av_image_fill_max_pixsteps(s->main_pix_step, NULL, pix_desc);

252

253 s->hsub = pix_desc->log2_chroma_w;

254 s->vsub = pix_desc->log2_chroma_h;

255

256 s->main_is_packed_rgb =

257 ff_fill_rgba_map(s->main_rgba_map, inlink->format) >= 0;

258 s->main_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);

259 return 0;

260 }

261

262 static int config_input_overlay(AVFilterLink *inlink)

263 {

264 AVFilterContext *ctx = inlink->dst;

265 OverlayContext *s = inlink->dst->priv;

266 int ret;

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

268

269 av_image_fill_max_pixsteps(s->overlay_pix_step, NULL, pix_desc);

270

271 /* Finish the configuration by evaluating the expressions

272 now when both inputs are configured. */

273 s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;

274 s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;

275 s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;

276 s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;

277 s->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;

278 s->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;

279 s->var_values[VAR_X] = NAN;

280 s->var_values[VAR_Y] = NAN;

281 s->var_values[VAR_N] = 0;

282 s->var_values[VAR_T] = NAN;

283 s->var_values[VAR_POS] = NAN;

284

285 if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||

286 (ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)

287 return ret;

288

289 s->overlay_is_packed_rgb =

290 ff_fill_rgba_map(s->overlay_rgba_map, inlink->format) >= 0;

291 s->overlay_has_alpha = ff_fmt_is_in(inlink->format, alpha_pix_fmts);

292

293 if (s->eval_mode == EVAL_MODE_INIT) {

294 eval_expr(ctx);

295 av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",

296 s->var_values[VAR_X], s->x,

297 s->var_values[VAR_Y], s->y);

298 }

299

300 av_log(ctx, AV_LOG_VERBOSE,

301 "main w:%d h:%d fmt:%s overlay w:%d h:%d fmt:%s\n",

302 ctx->inputs[MAIN]->w, ctx->inputs[MAIN]->h,

303 av_get_pix_fmt_name(ctx->inputs[MAIN]->format),

304 ctx->inputs[OVERLAY]->w, ctx->inputs[OVERLAY]->h,

305 av_get_pix_fmt_name(ctx->inputs[OVERLAY]->format));

306 return 0;

307 }

308

309 static int config_output(AVFilterLink *outlink)

310 {

311 AVFilterContext *ctx = outlink->src;

312 OverlayContext *s = ctx->priv;

313 int ret;

314

315 if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)

316 return ret;

317

318 outlink->w = ctx->inputs[MAIN]->w;

319 outlink->h = ctx->inputs[MAIN]->h;

320 outlink->time_base = ctx->inputs[MAIN]->time_base;

321

322 return 0;

323 }

324

325 // divide by 255 and round to nearest

326 // apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16

327 #define FAST_DIV255(x) ((((x) + 128) * 257) >> 16)

328

329 // calculate the unpremultiplied alpha, applying the general equation:

330 // alpha = alpha_overlay / ( (alpha_main + alpha_overlay) - (alpha_main * alpha_overlay) )

331 // (((x) << 16) - ((x) << 9) + (x)) is a faster version of: 255 * 255 * x

332 // ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)) is a faster version of: 255 * (x + y)

333 #define UNPREMULTIPLY_ALPHA(x, y) ((((x) << 16) - ((x) << 9) + (x)) / ((((x) + (y)) << 8) - ((x) + (y)) - (y) * (x)))

334

335 /**

336 * Blend image in src to destination buffer dst at position (x, y).

337 */

338 static void blend_image(AVFilterContext *ctx,

339 AVFrame *dst, const AVFrame *src,

340 int x, int y)

341 {

342 OverlayContext *s = ctx->priv;

343 int i, imax, j, jmax, k, kmax;

344 const int src_w = src->width;

345 const int src_h = src->height;

346 const int dst_w = dst->width;

347 const int dst_h = dst->height;

348

349 if (x >= dst_w || x+src_w < 0 ||

350 y >= dst_h || y+src_h < 0)

351 return; /* no intersection */

352

353 if (s->main_is_packed_rgb) {

354 uint8_t alpha; ///< the amount of overlay to blend on to main

355 const int dr = s->main_rgba_map[R];

356 const int dg = s->main_rgba_map[G];

357 const int db = s->main_rgba_map[B];

358 const int da = s->main_rgba_map[A];

359 const int dstep = s->main_pix_step[0];

360 const int sr = s->overlay_rgba_map[R];

361 const int sg = s->overlay_rgba_map[G];

362 const int sb = s->overlay_rgba_map[B];

363 const int sa = s->overlay_rgba_map[A];

364 const int sstep = s->overlay_pix_step[0];

365 const int main_has_alpha = s->main_has_alpha;

366 uint8_t *s, *sp, *d, *dp;

367

368 i = FFMAX(-y, 0);

369 sp = src->data[0] + i * src->linesize[0];

370 dp = dst->data[0] + (y+i) * dst->linesize[0];

371

372 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {

373 j = FFMAX(-x, 0);

374 s = sp + j * sstep;

375 d = dp + (x+j) * dstep;

376

377 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {

378 alpha = s[sa];

379

380 // if the main channel has an alpha channel, alpha has to be calculated

381 // to create an un-premultiplied (straight) alpha value

382 if (main_has_alpha && alpha != 0 && alpha != 255) {

383 uint8_t alpha_d = d[da];

384 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);

385 }

386

387 switch (alpha) {

388 case 0:

389 break;

390 case 255:

391 d[dr] = s[sr];

392 d[dg] = s[sg];

393 d[db] = s[sb];

394 break;

395 default:

396 // main_value = main_value * (1 - alpha) + overlay_value * alpha

397 // since alpha is in the range 0-255, the result must divided by 255

398 d[dr] = FAST_DIV255(d[dr] * (255 - alpha) + s[sr] * alpha);

399 d[dg] = FAST_DIV255(d[dg] * (255 - alpha) + s[sg] * alpha);

400 d[db] = FAST_DIV255(d[db] * (255 - alpha) + s[sb] * alpha);

401 }

402 if (main_has_alpha) {

403 switch (alpha) {

404 case 0:

405 break;

406 case 255:

407 d[da] = s[sa];

408 break;

409 default:

410 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha

411 d[da] += FAST_DIV255((255 - d[da]) * s[sa]);

412 }

413 }

414 d += dstep;

415 s += sstep;

416 }

417 dp += dst->linesize[0];

418 sp += src->linesize[0];

419 }

420 } else {

421 const int main_has_alpha = s->main_has_alpha;

422 if (main_has_alpha) {

423 uint8_t alpha; ///< the amount of overlay to blend on to main

424 uint8_t *s, *sa, *d, *da;

425

426 i = FFMAX(-y, 0);

427 sa = src->data[3] + i * src->linesize[3];

428 da = dst->data[3] + (y+i) * dst->linesize[3];

429

430 for (imax = FFMIN(-y + dst_h, src_h); i < imax; i++) {

431 j = FFMAX(-x, 0);

432 s = sa + j;

433 d = da + x+j;

434

435 for (jmax = FFMIN(-x + dst_w, src_w); j < jmax; j++) {

436 alpha = *s;

437 if (alpha != 0 && alpha != 255) {

438 uint8_t alpha_d = *d;

439 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);

440 }

441 switch (alpha) {

442 case 0:

443 break;

444 case 255:

445 *d = *s;

446 break;

447 default:

448 // apply alpha compositing: main_alpha += (1-main_alpha) * overlay_alpha

449 *d += FAST_DIV255((255 - *d) * *s);

450 }

451 d += 1;

452 s += 1;

453 }

454 da += dst->linesize[3];

455 sa += src->linesize[3];

456 }

457 }

458 for (i = 0; i < 3; i++) {

459 int hsub = i ? s->hsub : 0;

460 int vsub = i ? s->vsub : 0;

461 int src_wp = FF_CEIL_RSHIFT(src_w, hsub);

462 int src_hp = FF_CEIL_RSHIFT(src_h, vsub);

463 int dst_wp = FF_CEIL_RSHIFT(dst_w, hsub);

464 int dst_hp = FF_CEIL_RSHIFT(dst_h, vsub);

465 int yp = y>>vsub;

466 int xp = x>>hsub;

467 uint8_t *s, *sp, *d, *dp, *a, *ap;

468

469 j = FFMAX(-yp, 0);

470 sp = src->data[i] + j * src->linesize[i];

471 dp = dst->data[i] + (yp+j) * dst->linesize[i];

472 ap = src->data[3] + (j<<vsub) * src->linesize[3];

473

474 for (jmax = FFMIN(-yp + dst_hp, src_hp); j < jmax; j++) {

475 k = FFMAX(-xp, 0);

476 d = dp + xp+k;

477 s = sp + k;

478 a = ap + (k<<hsub);

479

480 for (kmax = FFMIN(-xp + dst_wp, src_wp); k < kmax; k++) {

481 int alpha_v, alpha_h, alpha;

482

483 // average alpha for color components, improve quality

484 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {

485 alpha = (a[0] + a[src->linesize[3]] +

486 a[1] + a[src->linesize[3]+1]) >> 2;

487 } else if (hsub || vsub) {

488 alpha_h = hsub && k+1 < src_wp ?

489 (a[0] + a[1]) >> 1 : a[0];

490 alpha_v = vsub && j+1 < src_hp ?

491 (a[0] + a[src->linesize[3]]) >> 1 : a[0];

492 alpha = (alpha_v + alpha_h) >> 1;

493 } else

494 alpha = a[0];

495 // if the main channel has an alpha channel, alpha has to be calculated

496 // to create an un-premultiplied (straight) alpha value

497 if (main_has_alpha && alpha != 0 && alpha != 255) {

498 // average alpha for color components, improve quality

499 uint8_t alpha_d;

500 if (hsub && vsub && j+1 < src_hp && k+1 < src_wp) {

501 alpha_d = (d[0] + d[src->linesize[3]] +

502 d[1] + d[src->linesize[3]+1]) >> 2;

503 } else if (hsub || vsub) {

504 alpha_h = hsub && k+1 < src_wp ?

505 (d[0] + d[1]) >> 1 : d[0];

506 alpha_v = vsub && j+1 < src_hp ?

507 (d[0] + d[src->linesize[3]]) >> 1 : d[0];

508 alpha_d = (alpha_v + alpha_h) >> 1;

509 } else

510 alpha_d = d[0];

511 alpha = UNPREMULTIPLY_ALPHA(alpha, alpha_d);

512 }

513 *d = FAST_DIV255(*d * (255 - alpha) + *s * alpha);

514 s++;

515 d++;

516 a += 1 << hsub;

517 }

518 dp += dst->linesize[i];

519 sp += src->linesize[i];

520 ap += (1 << vsub) * src->linesize[3];

521 }

522 }

523 }

524 }

525

526 static AVFrame *do_blend(AVFilterContext *ctx, AVFrame *mainpic,

527 const AVFrame *second)

528 {

529 OverlayContext *s = ctx->priv;

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

531

532 /* TODO: reindent */

533 if (s->eval_mode == EVAL_MODE_FRAME) {

534 int64_t pos = av_frame_get_pkt_pos(mainpic);

535

536 s->var_values[VAR_N] = inlink->frame_count;

537 s->var_values[VAR_T] = mainpic->pts == AV_NOPTS_VALUE ?

538 NAN : mainpic->pts * av_q2d(inlink->time_base);

539 s->var_values[VAR_POS] = pos == -1 ? NAN : pos;

540

541 eval_expr(ctx);

542 av_log(ctx, AV_LOG_DEBUG, "n:%f t:%f pos:%f x:%f xi:%d y:%f yi:%d\n",

543 s->var_values[VAR_N], s->var_values[VAR_T], s->var_values[VAR_POS],

544 s->var_values[VAR_X], s->x,

545 s->var_values[VAR_Y], s->y);

546 }

547

548 blend_image(ctx, mainpic, second, s->x, s->y);

549 return mainpic;

550 }

551

552 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)

553 {

554 OverlayContext *s = inlink->dst->priv;

555 return ff_dualinput_filter_frame(&s->dinput, inlink, inpicref);

556 }

557

558 static int request_frame(AVFilterLink *outlink)

559 {

560 OverlayContext *s = outlink->src->priv;

561 return ff_dualinput_request_frame(&s->dinput, outlink);

562 }

563

564 static av_cold int init(AVFilterContext *ctx)

565 {

566 OverlayContext *s = ctx->priv;

567

568 if (s->allow_packed_rgb) {

569 av_log(ctx, AV_LOG_WARNING,

570 "The rgb option is deprecated and is overriding the format option, use format instead\n");

571 s->format = OVERLAY_FORMAT_RGB;

572 }

573 s->dinput.process = do_blend;

574 return 0;

575 }

576

577 #define OFFSET(x) offsetof(OverlayContext, x)

578 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

579

580 static const AVOption overlay_options[] = {

581 { "x", "set the x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },

582 { "y", "set the y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },

583 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_FRAME}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },

584 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },

585 { "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },

586 { "rgb", "force packed RGB in input and output (deprecated)", OFFSET(allow_packed_rgb), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS },

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

588 { "format", "set output format", OFFSET(format), AV_OPT_TYPE_INT, {.i64=OVERLAY_FORMAT_YUV420}, 0, OVERLAY_FORMAT_NB-1, FLAGS, "format" },

589 { "yuv420", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV420}, .flags = FLAGS, .unit = "format" },

590 { "yuv444", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_YUV444}, .flags = FLAGS, .unit = "format" },

591 { "rgb", "", 0, AV_OPT_TYPE_CONST, {.i64=OVERLAY_FORMAT_RGB}, .flags = FLAGS, .unit = "format" },

592 { "repeatlast", "repeat overlay of the last overlay frame", OFFSET(dinput.repeatlast), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },

593 { NULL }

594 };

595

596 AVFILTER_DEFINE_CLASS(overlay);

597

598 static const AVFilterPad avfilter_vf_overlay_inputs[] = {

599 {

600 .name = "main",

601 .type = AVMEDIA_TYPE_VIDEO,

602 .config_props = config_input_main,

603 .filter_frame = filter_frame,

604 .needs_writable = 1,

605 },

606 {

607 .name = "overlay",

608 .type = AVMEDIA_TYPE_VIDEO,

609 .config_props = config_input_overlay,

610 .filter_frame = filter_frame,

611 },

612 { NULL }

613 };

614

615 static const AVFilterPad avfilter_vf_overlay_outputs[] = {

616 {

617 .name = "default",

618 .type = AVMEDIA_TYPE_VIDEO,

619 .config_props = config_output,

620 .request_frame = request_frame,

621 },

622 { NULL }

623 };

624

625 AVFilter avfilter_vf_overlay = {

626 .name = "overlay",

627 .description = NULL_IF_CONFIG_SMALL("Overlay a video source on top of the input."),

628 .init = init,

629 .uninit = uninit,

630 .priv_size = sizeof(OverlayContext),

631 .priv_class = &overlay_class,

632 .query_formats = query_formats,

633 .process_command = process_command,

634 .inputs = avfilter_vf_overlay_inputs,

635 .outputs = avfilter_vf_overlay_outputs,

636 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

637 };

Generated on Sat Jan 25 2014 19:52:01 for FFmpeg by doxygen 1.8.2