2 * Copyright (c) 2007 Bobby Bingham
4 * This file is part of FFmpeg.
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.
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.
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
34 #include "libavutil/avstring.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"
50 typedef struct ScaleContext {
52 struct SwsContext *sws; ///< software scaler context
53 struct SwsContext *isws[2]; ///< software scaler context for interlaced material
57 * New dimensions. Special values are:
58 * 0 = original width/height
59 * -1 = keep original aspect
60 * -N = try to keep aspect but make sure it is divisible by N
64 unsigned int flags; ///sws flags
65 double param[2]; // sws params
67 int hsub, vsub; ///< chroma subsampling
68 int slice_y; ///< top of current output slice
69 int input_is_pal; ///< set to 1 if the input format is paletted
70 int output_is_pal; ///< set to 1 if the output format is paletted
73 char *w_expr; ///< width expression string
74 char *h_expr; ///< height expression string
77 char *in_color_matrix;
78 char *out_color_matrix;
88 int force_original_aspect_ratio;
92 int eval_mode; ///< expression evaluation mode
96 AVFilter ff_vf_scale2ref;
98 static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
100 ScaleContext *scale = ctx->priv;
103 if (scale->size_str && (scale->w_expr || scale->h_expr)) {
104 av_log(ctx, AV_LOG_ERROR,
105 "Size and width/height expressions cannot be set at the same time.\n");
106 return AVERROR(EINVAL);
109 if (scale->w_expr && !scale->h_expr)
110 FFSWAP(char *, scale->w_expr, scale->size_str);
112 if (scale->size_str) {
114 if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
115 av_log(ctx, AV_LOG_ERROR,
116 "Invalid size '%s'\n", scale->size_str);
119 snprintf(buf, sizeof(buf)-1, "%d", scale->w);
120 av_opt_set(scale, "w", buf, 0);
121 snprintf(buf, sizeof(buf)-1, "%d", scale->h);
122 av_opt_set(scale, "h", buf, 0);
125 av_opt_set(scale, "w", "iw", 0);
127 av_opt_set(scale, "h", "ih", 0);
129 av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
130 scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
134 if (scale->flags_str) {
135 const AVClass *class = sws_get_class();
136 const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
137 AV_OPT_SEARCH_FAKE_OBJ);
138 int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
148 static av_cold void uninit(AVFilterContext *ctx)
150 ScaleContext *scale = ctx->priv;
151 sws_freeContext(scale->sws);
152 sws_freeContext(scale->isws[0]);
153 sws_freeContext(scale->isws[1]);
155 av_dict_free(&scale->opts);
158 static int query_formats(AVFilterContext *ctx)
160 AVFilterFormats *formats;
161 enum AVPixelFormat pix_fmt;
164 if (ctx->inputs[0]) {
165 const AVPixFmtDescriptor *desc = NULL;
167 while ((desc = av_pix_fmt_desc_next(desc))) {
168 pix_fmt = av_pix_fmt_desc_get_id(desc);
169 if ((sws_isSupportedInput(pix_fmt) ||
170 sws_isSupportedEndiannessConversion(pix_fmt))
171 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
175 if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0)
178 if (ctx->outputs[0]) {
179 const AVPixFmtDescriptor *desc = NULL;
181 while ((desc = av_pix_fmt_desc_next(desc))) {
182 pix_fmt = av_pix_fmt_desc_get_id(desc);
183 if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
184 sws_isSupportedEndiannessConversion(pix_fmt))
185 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
189 if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
196 static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
201 if (s && strstr(s, "bt709")) {
202 colorspace = AVCOL_SPC_BT709;
203 } else if (s && strstr(s, "fcc")) {
204 colorspace = AVCOL_SPC_FCC;
205 } else if (s && strstr(s, "smpte240m")) {
206 colorspace = AVCOL_SPC_SMPTE240M;
207 } else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
208 colorspace = AVCOL_SPC_BT470BG;
209 } else if (s && strstr(s, "bt2020")) {
210 colorspace = AVCOL_SPC_BT2020_NCL;
213 if (colorspace < 1 || colorspace > 10 || colorspace == 8) {
214 colorspace = AVCOL_SPC_BT470BG;
217 return sws_getCoefficients(colorspace);
220 static int config_props(AVFilterLink *outlink)
222 AVFilterContext *ctx = outlink->src;
223 AVFilterLink *inlink0 = outlink->src->inputs[0];
224 AVFilterLink *inlink = ctx->filter == &ff_vf_scale2ref ?
225 outlink->src->inputs[1] :
226 outlink->src->inputs[0];
227 enum AVPixelFormat outfmt = outlink->format;
228 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
229 ScaleContext *scale = ctx->priv;
233 if ((ret = ff_scale_eval_dimensions(ctx,
234 scale->w_expr, scale->h_expr,
239 /* Note that force_original_aspect_ratio may overwrite the previous set
240 * dimensions so that it is not divisible by the set factors anymore. */
241 if (scale->force_original_aspect_ratio) {
242 int tmp_w = av_rescale(h, inlink->w, inlink->h);
243 int tmp_h = av_rescale(w, inlink->h, inlink->w);
245 if (scale->force_original_aspect_ratio == 1) {
254 if (w > INT_MAX || h > INT_MAX ||
255 (h * inlink->w) > INT_MAX ||
256 (w * inlink->h) > INT_MAX)
257 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
262 /* TODO: make algorithm configurable */
264 scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL;
265 if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
266 scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL ||
267 av_pix_fmt_desc_get(outfmt)->flags & FF_PSEUDOPAL;
270 sws_freeContext(scale->sws);
272 sws_freeContext(scale->isws[0]);
274 sws_freeContext(scale->isws[1]);
275 scale->isws[0] = scale->isws[1] = scale->sws = NULL;
276 if (inlink0->w == outlink->w &&
277 inlink0->h == outlink->h &&
278 !scale->out_color_matrix &&
279 scale->in_range == scale->out_range &&
280 inlink0->format == outlink->format)
283 struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
286 for (i = 0; i < 3; i++) {
287 int in_v_chr_pos = scale->in_v_chr_pos, out_v_chr_pos = scale->out_v_chr_pos;
288 struct SwsContext **s = swscs[i];
289 *s = sws_alloc_context();
291 return AVERROR(ENOMEM);
293 av_opt_set_int(*s, "srcw", inlink0 ->w, 0);
294 av_opt_set_int(*s, "srch", inlink0 ->h >> !!i, 0);
295 av_opt_set_int(*s, "src_format", inlink0->format, 0);
296 av_opt_set_int(*s, "dstw", outlink->w, 0);
297 av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);
298 av_opt_set_int(*s, "dst_format", outfmt, 0);
299 av_opt_set_int(*s, "sws_flags", scale->flags, 0);
300 av_opt_set_int(*s, "param0", scale->param[0], 0);
301 av_opt_set_int(*s, "param1", scale->param[1], 0);
302 if (scale->in_range != AVCOL_RANGE_UNSPECIFIED)
303 av_opt_set_int(*s, "src_range",
304 scale->in_range == AVCOL_RANGE_JPEG, 0);
305 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
306 av_opt_set_int(*s, "dst_range",
307 scale->out_range == AVCOL_RANGE_JPEG, 0);
310 AVDictionaryEntry *e = NULL;
311 while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
312 if ((ret = av_opt_set(*s, e->key, e->value, 0)) < 0)
316 /* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
317 * MPEG-2 chroma positions are used by convention
318 * XXX: support other 4:2:0 pixel formats */
319 if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
320 in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
323 if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
324 out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
327 av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
328 av_opt_set_int(*s, "src_v_chr_pos", in_v_chr_pos, 0);
329 av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
330 av_opt_set_int(*s, "dst_v_chr_pos", out_v_chr_pos, 0);
332 if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
334 if (!scale->interlaced)
339 if (inlink0->sample_aspect_ratio.num){
340 outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink0->w, outlink->w * inlink0->h}, inlink0->sample_aspect_ratio);
342 outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
344 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",
345 inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
346 inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
347 outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
348 outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
356 static int config_props_ref(AVFilterLink *outlink)
358 AVFilterLink *inlink = outlink->src->inputs[1];
360 outlink->w = inlink->w;
361 outlink->h = inlink->h;
362 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
363 outlink->time_base = inlink->time_base;
364 outlink->frame_rate = inlink->frame_rate;
369 static int request_frame(AVFilterLink *outlink)
371 return ff_request_frame(outlink->src->inputs[0]);
374 static int request_frame_ref(AVFilterLink *outlink)
376 return ff_request_frame(outlink->src->inputs[1]);
379 static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
381 ScaleContext *scale = link->dst->priv;
382 const uint8_t *in[4];
384 int in_stride[4],out_stride[4];
388 int vsub= ((i+1)&2) ? scale->vsub : 0;
389 in_stride[i] = cur_pic->linesize[i] * mul;
390 out_stride[i] = out_buf->linesize[i] * mul;
391 in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
392 out[i] = out_buf->data[i] + field * out_buf->linesize[i];
394 if(scale->input_is_pal)
395 in[1] = cur_pic->data[1];
396 if(scale->output_is_pal)
397 out[1] = out_buf->data[1];
399 return sws_scale(sws, in, in_stride, y/mul, h,
403 static int filter_frame(AVFilterLink *link, AVFrame *in)
405 ScaleContext *scale = link->dst->priv;
406 AVFilterLink *outlink = link->dst->outputs[0];
408 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
412 if (in->colorspace == AVCOL_SPC_YCGCO)
413 av_log(link->dst, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
415 if( in->width != link->w
416 || in->height != link->h
417 || in->format != link->format
418 || in->sample_aspect_ratio.den != link->sample_aspect_ratio.den || in->sample_aspect_ratio.num != link->sample_aspect_ratio.num) {
421 if (scale->eval_mode == EVAL_MODE_INIT) {
422 snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
423 av_opt_set(scale, "w", buf, 0);
424 snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
425 av_opt_set(scale, "h", buf, 0);
428 link->dst->inputs[0]->format = in->format;
429 link->dst->inputs[0]->w = in->width;
430 link->dst->inputs[0]->h = in->height;
432 link->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
433 link->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
436 if ((ret = config_props(outlink)) < 0)
441 return ff_filter_frame(outlink, in);
443 scale->hsub = desc->log2_chroma_w;
444 scale->vsub = desc->log2_chroma_h;
446 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
449 return AVERROR(ENOMEM);
452 av_frame_copy_props(out, in);
453 out->width = outlink->w;
454 out->height = outlink->h;
456 if(scale->output_is_pal)
457 avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
459 in_range = in->color_range;
461 if ( scale->in_color_matrix
462 || scale->out_color_matrix
463 || scale-> in_range != AVCOL_RANGE_UNSPECIFIED
464 || in_range != AVCOL_RANGE_UNSPECIFIED
465 || scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
466 int in_full, out_full, brightness, contrast, saturation;
467 const int *inv_table, *table;
469 sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
470 (int **)&table, &out_full,
471 &brightness, &contrast, &saturation);
473 if (scale->in_color_matrix)
474 inv_table = parse_yuv_type(scale->in_color_matrix, in->colorspace);
475 if (scale->out_color_matrix)
476 table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);
477 else if (scale->in_color_matrix)
480 if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
481 in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
482 else if (in_range != AVCOL_RANGE_UNSPECIFIED)
483 in_full = (in_range == AVCOL_RANGE_JPEG);
484 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
485 out_full = (scale->out_range == AVCOL_RANGE_JPEG);
487 sws_setColorspaceDetails(scale->sws, inv_table, in_full,
489 brightness, contrast, saturation);
491 sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
493 brightness, contrast, saturation);
495 sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
497 brightness, contrast, saturation);
499 out->color_range = out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
502 av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
503 (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
504 (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
507 if(scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)){
508 scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
509 scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);
510 }else if (scale->nb_slices) {
511 int i, slice_h, slice_start, slice_end = 0;
512 const int nb_slices = FFMIN(scale->nb_slices, link->h);
513 for (i = 0; i < nb_slices; i++) {
514 slice_start = slice_end;
515 slice_end = (link->h * (i+1)) / nb_slices;
516 slice_h = slice_end - slice_start;
517 scale_slice(link, out, in, scale->sws, slice_start, slice_h, 1, 0);
520 scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);
524 return ff_filter_frame(outlink, out);
527 static int filter_frame_ref(AVFilterLink *link, AVFrame *in)
529 AVFilterLink *outlink = link->dst->outputs[1];
531 return ff_filter_frame(outlink, in);
534 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
535 char *res, int res_len, int flags)
537 ScaleContext *scale = ctx->priv;
540 if ( !strcmp(cmd, "width") || !strcmp(cmd, "w")
541 || !strcmp(cmd, "height") || !strcmp(cmd, "h")) {
543 int old_w = scale->w;
544 int old_h = scale->h;
545 AVFilterLink *outlink = ctx->outputs[0];
547 av_opt_set(scale, cmd, args, 0);
548 if ((ret = config_props(outlink)) < 0) {
553 ret = AVERROR(ENOSYS);
558 static const AVClass *child_class_next(const AVClass *prev)
560 return prev ? NULL : sws_get_class();
563 #define OFFSET(x) offsetof(ScaleContext, x)
564 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
566 static const AVOption scale_options[] = {
567 { "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
568 { "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
569 { "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
570 { "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
571 { "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
572 { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_BOOL, {.i64 = 0 }, -1, 1, FLAGS },
573 { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
574 { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
575 { "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS },
576 { "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
577 { "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
578 { "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
579 { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
580 { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
581 { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
582 { "limited",NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
583 { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
584 { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
585 { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
586 { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
587 { "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 },
588 { "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 },
589 { "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 },
590 { "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 },
591 { "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" },
592 { "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
593 { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
594 { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
595 { "param0", "Scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
596 { "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
597 { "nb_slices", "set the number of slices (debug purpose only)", OFFSET(nb_slices), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
598 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
599 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
600 { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
604 static const AVClass scale_class = {
605 .class_name = "scale",
606 .item_name = av_default_item_name,
607 .option = scale_options,
608 .version = LIBAVUTIL_VERSION_INT,
609 .category = AV_CLASS_CATEGORY_FILTER,
610 .child_class_next = child_class_next,
613 static const AVFilterPad avfilter_vf_scale_inputs[] = {
616 .type = AVMEDIA_TYPE_VIDEO,
617 .filter_frame = filter_frame,
622 static const AVFilterPad avfilter_vf_scale_outputs[] = {
625 .type = AVMEDIA_TYPE_VIDEO,
626 .config_props = config_props,
631 AVFilter ff_vf_scale = {
633 .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
634 .init_dict = init_dict,
636 .query_formats = query_formats,
637 .priv_size = sizeof(ScaleContext),
638 .priv_class = &scale_class,
639 .inputs = avfilter_vf_scale_inputs,
640 .outputs = avfilter_vf_scale_outputs,
641 .process_command = process_command,
644 static const AVClass scale2ref_class = {
645 .class_name = "scale2ref",
646 .item_name = av_default_item_name,
647 .option = scale_options,
648 .version = LIBAVUTIL_VERSION_INT,
649 .category = AV_CLASS_CATEGORY_FILTER,
650 .child_class_next = child_class_next,
653 static const AVFilterPad avfilter_vf_scale2ref_inputs[] = {
656 .type = AVMEDIA_TYPE_VIDEO,
657 .filter_frame = filter_frame,
661 .type = AVMEDIA_TYPE_VIDEO,
662 .filter_frame = filter_frame_ref,
667 static const AVFilterPad avfilter_vf_scale2ref_outputs[] = {
670 .type = AVMEDIA_TYPE_VIDEO,
671 .config_props = config_props,
672 .request_frame= request_frame,
676 .type = AVMEDIA_TYPE_VIDEO,
677 .config_props = config_props_ref,
678 .request_frame= request_frame_ref,
683 AVFilter ff_vf_scale2ref = {
685 .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference."),
686 .init_dict = init_dict,
688 .query_formats = query_formats,
689 .priv_size = sizeof(ScaleContext),
690 .priv_class = &scale2ref_class,
691 .inputs = avfilter_vf_scale2ref_inputs,
692 .outputs = avfilter_vf_scale2ref_outputs,
693 .process_command = process_command,