FFmpeg: libavfilter/vf_scale.c Source File

FFmpeg

[フレーム]

libavfilter

vf_scale.c

Go to the documentation of this file.

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 * scale video filter

24 */

26 #include <stdio.h>

27 #include <string.h>

29 #include "avfilter.h"

30 #include "formats.h"

31 #include "internal.h"

32 #include "video.h"

33 #include "libavutil/avstring.h"

34 #include "libavutil/eval.h"

35 #include "libavutil/internal.h"

36 #include "libavutil/mathematics.h"

37 #include "libavutil/opt.h"

38 #include "libavutil/parseutils.h"

39 #include "libavutil/pixdesc.h"

40 #include "libavutil/imgutils.h"

41 #include "libavutil/avassert.h"

42 #include "libswscale/swscale.h"

44 static const char *const var_names[] = {

45 "in_w", "iw",

46 "in_h", "ih",

47 "out_w", "ow",

48 "out_h", "oh",

49 "a",

50 "sar",

51 "dar",

52 "hsub",

53 "vsub",

54 NULL

55 };

57 enum var_name {

58 VAR_IN_W, VAR_IW,

59 VAR_IN_H, VAR_IH,

60 VAR_OUT_W, VAR_OW,

61 VAR_OUT_H, VAR_OH,

62 VAR_A,

63 VAR_SAR,

64 VAR_DAR,

65 VAR_HSUB,

66 VAR_VSUB,

67 VARS_NB

68 };

70 typedef struct {

71 const AVClass *class;

72 struct SwsContext *sws; ///< software scaler context

73 struct SwsContext *isws[2]; ///< software scaler context for interlaced material

74 AVDictionary *opts;

76 /**

77 * New dimensions. Special values are:

78 * 0 = original width/height

79 * -1 = keep original aspect

80 */

81 int w, h;

82 char *size_str;

83 unsigned int flags; ///sws flags

85 int hsub, vsub; ///< chroma subsampling

86 int slice_y; ///< top of current output slice

87 int input_is_pal; ///< set to 1 if the input format is paletted

88 int output_is_pal; ///< set to 1 if the output format is paletted

89 int interlaced;

91 char *w_expr; ///< width expression string

92 char *h_expr; ///< height expression string

93 char *flags_str;

95 char *in_color_matrix;

96 char *out_color_matrix;

98 int in_range;

99 int out_range;

100

101 int out_h_chr_pos;

102 int out_v_chr_pos;

103 int in_h_chr_pos;

104 int in_v_chr_pos;

105

106 int force_original_aspect_ratio;

107 } ScaleContext;

108

109 static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)

110 {

111 ScaleContext *scale = ctx->priv;

112 int ret;

113

114 if (scale->size_str && (scale->w_expr || scale->h_expr)) {

115 av_log(ctx, AV_LOG_ERROR,

116 "Size and width/height expressions cannot be set at the same time.\n");

117 return AVERROR(EINVAL);

118 }

119

120 if (scale->w_expr && !scale->h_expr)

121 FFSWAP(char *, scale->w_expr, scale->size_str);

122

123 if (scale->size_str) {

124 char buf[32];

125 if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {

126 av_log(ctx, AV_LOG_ERROR,

127 "Invalid size '%s'\n", scale->size_str);

128 return ret;

129 }

130 snprintf(buf, sizeof(buf)-1, "%d", scale->w);

131 av_opt_set(scale, "w", buf, 0);

132 snprintf(buf, sizeof(buf)-1, "%d", scale->h);

133 av_opt_set(scale, "h", buf, 0);

134 }

135 if (!scale->w_expr)

136 av_opt_set(scale, "w", "iw", 0);

137 if (!scale->h_expr)

138 av_opt_set(scale, "h", "ih", 0);

139

140 av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",

141 scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);

142

143 scale->flags = 0;

144

145 if (scale->flags_str) {

146 const AVClass *class = sws_get_class();

147 const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,

148 AV_OPT_SEARCH_FAKE_OBJ);

149 int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);

150 if (ret < 0)

151 return ret;

152 }

153 scale->opts = *opts;

154 *opts = NULL;

155

156 return 0;

157 }

158

159 static av_cold void uninit(AVFilterContext *ctx)

160 {

161 ScaleContext *scale = ctx->priv;

162 sws_freeContext(scale->sws);

163 sws_freeContext(scale->isws[0]);

164 sws_freeContext(scale->isws[1]);

165 scale->sws = NULL;

166 av_dict_free(&scale->opts);

167 }

168

169 static int query_formats(AVFilterContext *ctx)

170 {

171 AVFilterFormats *formats;

172 enum AVPixelFormat pix_fmt;

173 int ret;

174

175 if (ctx->inputs[0]) {

176 formats = NULL;

177 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)

178 if ((sws_isSupportedInput(pix_fmt) ||

179 sws_isSupportedEndiannessConversion(pix_fmt))

180 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {

181 ff_formats_unref(&formats);

182 return ret;

183 }

184 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);

185 }

186 if (ctx->outputs[0]) {

187 formats = NULL;

188 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)

189 if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||

190 sws_isSupportedEndiannessConversion(pix_fmt))

191 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {

192 ff_formats_unref(&formats);

193 return ret;

194 }

195 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);

196 }

197

198 return 0;

199 }

200

201 static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)

202 {

203 if (!s)

204 s = "bt601";

205

206 if (s && strstr(s, "bt709")) {

207 colorspace = AVCOL_SPC_BT709;

208 } else if (s && strstr(s, "fcc")) {

209 colorspace = AVCOL_SPC_FCC;

210 } else if (s && strstr(s, "smpte240m")) {

211 colorspace = AVCOL_SPC_SMPTE240M;

212 } else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {

213 colorspace = AVCOL_SPC_BT470BG;

214 }

215

216 if (colorspace < 1 || colorspace > 7) {

217 colorspace = AVCOL_SPC_BT470BG;

218 }

219

220 return sws_getCoefficients(colorspace);

221 }

222

223 static int config_props(AVFilterLink *outlink)

224 {

225 AVFilterContext *ctx = outlink->src;

226 AVFilterLink *inlink = outlink->src->inputs[0];

227 enum AVPixelFormat outfmt = outlink->format;

228 ScaleContext *scale = ctx->priv;

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

230 int64_t w, h;

231 double var_values[VARS_NB], res;

232 char *expr;

233 int ret;

234

235 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;

236 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;

237 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;

238 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;

239 var_values[VAR_A] = (double) inlink->w / inlink->h;

240 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?

241 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;

242 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];

243 var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;

244 var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;

245

246 /* evaluate width and height */

247 av_expr_parse_and_eval(&res, (expr = scale->w_expr),

248 var_names, var_values,

249 NULL, NULL, NULL, NULL, NULL, 0, ctx);

250 scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;

251 if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),

252 var_names, var_values,

253 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

254 goto fail;

255 scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;

256 /* evaluate again the width, as it may depend on the output height */

257 if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),

258 var_names, var_values,

259 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

260 goto fail;

261 scale->w = res;

262

263 w = scale->w;

264 h = scale->h;

265

266 /* sanity check params */

267 if (w < -1 || h < -1) {

268 av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");

269 return AVERROR(EINVAL);

270 }

271 if (w == -1 && h == -1)

272 scale->w = scale->h = 0;

273

274 if (!(w = scale->w))

275 w = inlink->w;

276 if (!(h = scale->h))

277 h = inlink->h;

278 if (w == -1)

279 w = av_rescale(h, inlink->w, inlink->h);

280 if (h == -1)

281 h = av_rescale(w, inlink->h, inlink->w);

282

283 if (scale->force_original_aspect_ratio) {

284 int tmp_w = av_rescale(h, inlink->w, inlink->h);

285 int tmp_h = av_rescale(w, inlink->h, inlink->w);

286

287 if (scale->force_original_aspect_ratio == 1) {

288 w = FFMIN(tmp_w, w);

289 h = FFMIN(tmp_h, h);

290 } else {

291 w = FFMAX(tmp_w, w);

292 h = FFMAX(tmp_h, h);

293 }

294 }

295

296 if (w > INT_MAX || h > INT_MAX ||

297 (h * inlink->w) > INT_MAX ||

298 (w * inlink->h) > INT_MAX)

299 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");

300

301 outlink->w = w;

302 outlink->h = h;

303

304 /* TODO: make algorithm configurable */

305

306 scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||

307 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;

308 if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;

309 scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL ||

310 av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;

311

312 if (scale->sws)

313 sws_freeContext(scale->sws);

314 if (scale->isws[0])

315 sws_freeContext(scale->isws[0]);

316 if (scale->isws[1])

317 sws_freeContext(scale->isws[1]);

318 scale->isws[0] = scale->isws[1] = scale->sws = NULL;

319 if (inlink->w == outlink->w && inlink->h == outlink->h &&

320 inlink->format == outlink->format)

321 ;

322 else {

323 struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};

324 int i;

325

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

327 struct SwsContext **s = swscs[i];

328 *s = sws_alloc_context();

329 if (!*s)

330 return AVERROR(ENOMEM);

331

332 if (scale->opts) {

333 AVDictionaryEntry *e = NULL;

334

335 while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {

336 if ((ret = av_opt_set(*s, e->key, e->value, 0)) < 0)

337 return ret;

338 }

339 }

340

341 av_opt_set_int(*s, "srcw", inlink ->w, 0);

342 av_opt_set_int(*s, "srch", inlink ->h >> !!i, 0);

343 av_opt_set_int(*s, "src_format", inlink->format, 0);

344 av_opt_set_int(*s, "dstw", outlink->w, 0);

345 av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);

346 av_opt_set_int(*s, "dst_format", outfmt, 0);

347 av_opt_set_int(*s, "sws_flags", scale->flags, 0);

348

349 av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);

350 av_opt_set_int(*s, "src_v_chr_pos", scale->in_v_chr_pos, 0);

351 av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);

352 av_opt_set_int(*s, "dst_v_chr_pos", scale->out_v_chr_pos, 0);

353

354 if ((ret = sws_init_context(*s, NULL, NULL)) < 0)

355 return ret;

356 if (!scale->interlaced)

357 break;

358 }

359 }

360

361 if (inlink->sample_aspect_ratio.num){

362 outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink->w, outlink->w * inlink->h}, inlink->sample_aspect_ratio);

363 } else

364 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

365

366 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d fmt:%s sar:%d/%d flags:0x%0x\n",

367 inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),

368 inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,

369 outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),

370 outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,

371 scale->flags);

372 return 0;

373

374 fail:

375 av_log(NULL, AV_LOG_ERROR,

376 "Error when evaluating the expression '%s'.\n"

377 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",

378 expr, scale->w_expr, scale->h_expr);

379 return ret;

380 }

381

382 static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)

383 {

384 ScaleContext *scale = link->dst->priv;

385 const uint8_t *in[4];

386 uint8_t *out[4];

387 int in_stride[4],out_stride[4];

388 int i;

389

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

391 int vsub= ((i+1)&2) ? scale->vsub : 0;

392 in_stride[i] = cur_pic->linesize[i] * mul;

393 out_stride[i] = out_buf->linesize[i] * mul;

394 in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];

395 out[i] = out_buf->data[i] + field * out_buf->linesize[i];

396 }

397 if(scale->input_is_pal)

398 in[1] = cur_pic->data[1];

399 if(scale->output_is_pal)

400 out[1] = out_buf->data[1];

401

402 return sws_scale(sws, in, in_stride, y/mul, h,

403 out,out_stride);

404 }

405

406 static int filter_frame(AVFilterLink *link, AVFrame *in)

407 {

408 ScaleContext *scale = link->dst->priv;

409 AVFilterLink *outlink = link->dst->outputs[0];

410 AVFrame *out;

411 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);

412 char buf[32];

413 int in_range;

414

415 if( in->width != link->w

416 || in->height != link->h

417 || in->format != link->format) {

418 int ret;

419 snprintf(buf, sizeof(buf)-1, "%d", outlink->w);

420 av_opt_set(scale, "w", buf, 0);

421 snprintf(buf, sizeof(buf)-1, "%d", outlink->h);

422 av_opt_set(scale, "h", buf, 0);

423

424 link->dst->inputs[0]->format = in->format;

425 link->dst->inputs[0]->w = in->width;

426 link->dst->inputs[0]->h = in->height;

427

428 if ((ret = config_props(outlink)) < 0)

429 return ret;

430 }

431

432 if (!scale->sws)

433 return ff_filter_frame(outlink, in);

434

435 scale->hsub = desc->log2_chroma_w;

436 scale->vsub = desc->log2_chroma_h;

437

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

439 if (!out) {

440 av_frame_free(&in);

441 return AVERROR(ENOMEM);

442 }

443

444 av_frame_copy_props(out, in);

445 out->width = outlink->w;

446 out->height = outlink->h;

447

448 if(scale->output_is_pal)

449 avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);

450

451 in_range = av_frame_get_color_range(in);

452

453 if ( scale->in_color_matrix

454 || scale->out_color_matrix

455 || scale-> in_range != AVCOL_RANGE_UNSPECIFIED

456 || in_range != AVCOL_RANGE_UNSPECIFIED

457 || scale->out_range != AVCOL_RANGE_UNSPECIFIED) {

458 int in_full, out_full, brightness, contrast, saturation;

459 const int *inv_table, *table;

460

461 sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,

462 (int **)&table, &out_full,

463 &brightness, &contrast, &saturation);

464

465 if (scale->in_color_matrix)

466 inv_table = parse_yuv_type(scale->in_color_matrix, av_frame_get_colorspace(in));

467 if (scale->out_color_matrix)

468 table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);

469

470 if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)

471 in_full = (scale-> in_range == AVCOL_RANGE_JPEG);

472 else if (in_range != AVCOL_RANGE_UNSPECIFIED)

473 in_full = (in_range == AVCOL_RANGE_JPEG);

474 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)

475 out_full = (scale->out_range == AVCOL_RANGE_JPEG);

476

477 sws_setColorspaceDetails(scale->sws, inv_table, in_full,

478 table, out_full,

479 brightness, contrast, saturation);

480 if (scale->isws[0])

481 sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,

482 table, out_full,

483 brightness, contrast, saturation);

484 if (scale->isws[1])

485 sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,

486 table, out_full,

487 brightness, contrast, saturation);

488 }

489

490 av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,

491 (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,

492 (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,

493 INT_MAX);

494

495 if(scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)){

496 scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);

497 scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);

498 }else{

499 scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);

500 }

501

502 av_frame_free(&in);

503 return ff_filter_frame(outlink, out);

504 }

505

506 static const AVClass *child_class_next(const AVClass *prev)

507 {

508 return prev ? NULL : sws_get_class();

509 }

510

511 #define OFFSET(x) offsetof(ScaleContext, x)

512 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

513

514 static const AVOption scale_options[] = {

515 { "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },

516 { "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },

517 { "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },

518 { "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },

519 { "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },

520 { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, 1, FLAGS },

521 { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },

522 { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },

523 { "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS },

524 { "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },

525 { "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },

526 { "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },

527 { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },

528 { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },

529 { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },

530 { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },

531 { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },

532 { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },

533 { "in_v_chr_pos", "input vertical chroma position in luma grid/256" , OFFSET(in_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1}, -1, 512, FLAGS },

534 { "in_h_chr_pos", "input horizontal chroma position in luma grid/256", OFFSET(in_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1}, -1, 512, FLAGS },

535 { "out_v_chr_pos", "output vertical chroma position in luma grid/256" , OFFSET(out_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1}, -1, 512, FLAGS },

536 { "out_h_chr_pos", "output horizontal chroma position in luma grid/256", OFFSET(out_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -1}, -1, 512, FLAGS },

537 { "force_original_aspect_ratio", "decrease or increase w/h if necessary to keep the original AR", OFFSET(force_original_aspect_ratio), AV_OPT_TYPE_INT, { .i64 = 0}, 0, 2, FLAGS, "force_oar" },

538 { "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },

539 { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },

540 { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },

541 { NULL }

542 };

543

544 static const AVClass scale_class = {

545 .class_name = "scale",

546 .item_name = av_default_item_name,

547 .option = scale_options,

548 .version = LIBAVUTIL_VERSION_INT,

549 .child_class_next = child_class_next,

550 };

551

552 static const AVFilterPad avfilter_vf_scale_inputs[] = {

553 {

554 .name = "default",

555 .type = AVMEDIA_TYPE_VIDEO,

556 .filter_frame = filter_frame,

557 },

558 { NULL }

559 };

560

561 static const AVFilterPad avfilter_vf_scale_outputs[] = {

562 {

563 .name = "default",

564 .type = AVMEDIA_TYPE_VIDEO,

565 .config_props = config_props,

566 },

567 { NULL }

568 };

569

570 AVFilter avfilter_vf_scale = {

571 .name = "scale",

572 .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),

573 .init_dict = init_dict,

574 .uninit = uninit,

575 .query_formats = query_formats,

576 .priv_size = sizeof(ScaleContext),

577 .priv_class = &scale_class,

578 .inputs = avfilter_vf_scale_inputs,

579 .outputs = avfilter_vf_scale_outputs,

580 };

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