FFmpeg: libavfilter/vf_scale.c Source File

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libavfilter

vf_scale.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 * 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 "ohsub",

55 "ovsub",

56 NULL

57 };

59 enum var_name {

60 VAR_IN_W, VAR_IW,

61 VAR_IN_H, VAR_IH,

62 VAR_OUT_W, VAR_OW,

63 VAR_OUT_H, VAR_OH,

64 VAR_A,

65 VAR_SAR,

66 VAR_DAR,

67 VAR_HSUB,

68 VAR_VSUB,

69 VAR_OHSUB,

70 VAR_OVSUB,

71 VARS_NB

72 };

74 typedef struct ScaleContext {

75 const AVClass *class;

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

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

78 AVDictionary *opts;

80 /**

81 * New dimensions. Special values are:

82 * 0 = original width/height

83 * -1 = keep original aspect

84 * -N = try to keep aspect but make sure it is divisible by N

85 */

86 int w, h;

87 char *size_str;

88 unsigned int flags; ///sws flags

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

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

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

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

94 int interlaced;

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

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

98 char *flags_str;

100 char *in_color_matrix;

101 char *out_color_matrix;

102

103 int in_range;

104 int out_range;

105

106 int out_h_chr_pos;

107 int out_v_chr_pos;

108 int in_h_chr_pos;

109 int in_v_chr_pos;

110

111 int force_original_aspect_ratio;

112 } ScaleContext;

113

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

115 {

116 ScaleContext *scale = ctx->priv;

117 int ret;

118

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

120 av_log(ctx, AV_LOG_ERROR,

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

122 return AVERROR(EINVAL);

123 }

124

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

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

127

128 if (scale->size_str) {

129 char buf[32];

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

131 av_log(ctx, AV_LOG_ERROR,

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

133 return ret;

134 }

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

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

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

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

139 }

140 if (!scale->w_expr)

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

142 if (!scale->h_expr)

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

144

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

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

147

148 scale->flags = 0;

149

150 if (scale->flags_str) {

151 const AVClass *class = sws_get_class();

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

153 AV_OPT_SEARCH_FAKE_OBJ);

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

155 if (ret < 0)

156 return ret;

157 }

158 scale->opts = *opts;

159 *opts = NULL;

160

161 return 0;

162 }

163

164 static av_cold void uninit(AVFilterContext *ctx)

165 {

166 ScaleContext *scale = ctx->priv;

167 sws_freeContext(scale->sws);

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

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

170 scale->sws = NULL;

171 av_dict_free(&scale->opts);

172 }

173

174 static int query_formats(AVFilterContext *ctx)

175 {

176 AVFilterFormats *formats;

177 enum AVPixelFormat pix_fmt;

178 int ret;

179

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

181 const AVPixFmtDescriptor *desc = NULL;

182 formats = NULL;

183 while ((desc = av_pix_fmt_desc_next(desc))) {

184 pix_fmt = av_pix_fmt_desc_get_id(desc);

185 if ((sws_isSupportedInput(pix_fmt) ||

186 sws_isSupportedEndiannessConversion(pix_fmt))

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

188 ff_formats_unref(&formats);

189 return ret;

190 }

191 }

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

193 }

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

195 const AVPixFmtDescriptor *desc = NULL;

196 formats = NULL;

197 while ((desc = av_pix_fmt_desc_next(desc))) {

198 pix_fmt = av_pix_fmt_desc_get_id(desc);

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

200 sws_isSupportedEndiannessConversion(pix_fmt))

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

202 ff_formats_unref(&formats);

203 return ret;

204 }

205 }

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

207 }

208

209 return 0;

210 }

211

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

213 {

214 if (!s)

215 s = "bt601";

216

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

218 colorspace = AVCOL_SPC_BT709;

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

220 colorspace = AVCOL_SPC_FCC;

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

222 colorspace = AVCOL_SPC_SMPTE240M;

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

224 colorspace = AVCOL_SPC_BT470BG;

225 }

226

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

228 colorspace = AVCOL_SPC_BT470BG;

229 }

230

231 return sws_getCoefficients(colorspace);

232 }

233

234 static int config_props(AVFilterLink *outlink)

235 {

236 AVFilterContext *ctx = outlink->src;

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

238 enum AVPixelFormat outfmt = outlink->format;

239 ScaleContext *scale = ctx->priv;

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

241 const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);

242 int64_t w, h;

243 double var_values[VARS_NB], res;

244 char *expr;

245 int ret;

246 int factor_w, factor_h;

247

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

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

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

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

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

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

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

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

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

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

258 var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;

259 var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;

260

261 /* evaluate width and height */

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

263 var_names, var_values,

264 NULL, NULL, NULL, NULL, NULL, 0, ctx);

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

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

267 var_names, var_values,

268 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

269 goto fail;

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

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

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

273 var_names, var_values,

274 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)

275 goto fail;

276 scale->w = res;

277

278 w = scale->w;

279 h = scale->h;

280

281 /* Check if it is requested that the result has to be divisible by a some

282 * factor (w or h = -n with n being the factor). */

283 factor_w = 1;

284 factor_h = 1;

285 if (w < -1) {

286 factor_w = -w;

287 }

288 if (h < -1) {

289 factor_h = -h;

290 }

291

292 if (w < 0 && h < 0)

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

294

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

296 w = inlink->w;

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

298 h = inlink->h;

299

300 /* Make sure that the result is divisible by the factor we determined

301 * earlier. If no factor was set, it is nothing will happen as the default

302 * factor is 1 */

303 if (w < 0)

304 w = av_rescale(h, inlink->w, inlink->h * factor_w) * factor_w;

305 if (h < 0)

306 h = av_rescale(w, inlink->h, inlink->w * factor_h) * factor_h;

307

308 /* Note that force_original_aspect_ratio may overwrite the previous set

309 * dimensions so that it is not divisible by the set factors anymore. */

310 if (scale->force_original_aspect_ratio) {

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

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

313

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

315 w = FFMIN(tmp_w, w);

316 h = FFMIN(tmp_h, h);

317 } else {

318 w = FFMAX(tmp_w, w);

319 h = FFMAX(tmp_h, h);

320 }

321 }

322

323 if (w > INT_MAX || h > INT_MAX ||

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

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

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

327

328 outlink->w = w;

329 outlink->h = h;

330

331 /* TODO: make algorithm configurable */

332

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

334 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;

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

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

337 av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;

338

339 if (scale->sws)

340 sws_freeContext(scale->sws);

341 if (scale->isws[0])

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

343 if (scale->isws[1])

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

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

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

347 inlink->format == outlink->format)

348 ;

349 else {

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

351 int i;

352

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

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

355 *s = sws_alloc_context();

356 if (!*s)

357 return AVERROR(ENOMEM);

358

359 if (scale->opts) {

360 AVDictionaryEntry *e = NULL;

361

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

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

364 return ret;

365 }

366 }

367

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

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

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

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

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

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

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

375

376 /* Override YUV420P settings to have the correct (MPEG-2) chroma positions

377 * MPEG-2 chroma positions are used by convention

378 * XXX: support other 4:2:0 pixel formats */

379 if (inlink->format == AV_PIX_FMT_YUV420P) {

380 scale->in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;

381 }

382

383 if (outlink->format == AV_PIX_FMT_YUV420P) {

384 scale->out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;

385 }

386

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

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

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

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

391

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

393 return ret;

394 if (!scale->interlaced)

395 break;

396 }

397 }

398

399 if (inlink->sample_aspect_ratio.num){

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

401 } else

402 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

403

404 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",

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

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

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

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

409 scale->flags);

410 return 0;

411

412 fail:

413 av_log(NULL, AV_LOG_ERROR,

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

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

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

417 return ret;

418 }

419

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

421 {

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

423 const uint8_t *in[4];

424 uint8_t *out[4];

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

426 int i;

427

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

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

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

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

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

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

434 }

435 if(scale->input_is_pal)

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

437 if(scale->output_is_pal)

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

439

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

441 out,out_stride);

442 }

443

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

445 {

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

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

448 AVFrame *out;

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

450 char buf[32];

451 int in_range;

452

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

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

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

456 int ret;

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

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

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

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

461

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

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

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

465

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

467 return ret;

468 }

469

470 if (!scale->sws)

471 return ff_filter_frame(outlink, in);

472

473 scale->hsub = desc->log2_chroma_w;

474 scale->vsub = desc->log2_chroma_h;

475

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

477 if (!out) {

478 av_frame_free(&in);

479 return AVERROR(ENOMEM);

480 }

481

482 av_frame_copy_props(out, in);

483 out->width = outlink->w;

484 out->height = outlink->h;

485

486 if(scale->output_is_pal)

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

488

489 in_range = av_frame_get_color_range(in);

490

491 if ( scale->in_color_matrix

492 || scale->out_color_matrix

493 || scale-> in_range != AVCOL_RANGE_UNSPECIFIED

494 || in_range != AVCOL_RANGE_UNSPECIFIED

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

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

497 const int *inv_table, *table;

498

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

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

501 &brightness, &contrast, &saturation);

502

503 if (scale->in_color_matrix)

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

505 if (scale->out_color_matrix)

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

507

508 if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)

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

510 else if (in_range != AVCOL_RANGE_UNSPECIFIED)

511 in_full = (in_range == AVCOL_RANGE_JPEG);

512 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)

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

514

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

516 table, out_full,

517 brightness, contrast, saturation);

518 if (scale->isws[0])

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

520 table, out_full,

521 brightness, contrast, saturation);

522 if (scale->isws[1])

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

524 table, out_full,

525 brightness, contrast, saturation);

526 }

527

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

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

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

531 INT_MAX);

532

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

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

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

536 }else{

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

538 }

539

540 av_frame_free(&in);

541 return ff_filter_frame(outlink, out);

542 }

543

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

545 {

546 return prev ? NULL : sws_get_class();

547 }

548

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

550 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

551

552 static const AVOption scale_options[] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

571 { "in_v_chr_pos", "input vertical chroma position in luma grid/256" , OFFSET(in_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },

572 { "in_h_chr_pos", "input horizontal chroma position in luma grid/256", OFFSET(in_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },

573 { "out_v_chr_pos", "output vertical chroma position in luma grid/256" , OFFSET(out_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },

574 { "out_h_chr_pos", "output horizontal chroma position in luma grid/256", OFFSET(out_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },

575 { "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" },

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

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

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

579 { NULL }

580 };

581

582 static const AVClass scale_class = {

583 .class_name = "scale",

584 .item_name = av_default_item_name,

585 .option = scale_options,

586 .version = LIBAVUTIL_VERSION_INT,

587 .category = AV_CLASS_CATEGORY_FILTER,