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
32 #include "scale_eval.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/eval.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/mathematics.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/parseutils.h"
40 #include "libavutil/pixdesc.h"
41 #include "libavutil/imgutils.h"
42 #include "libavutil/avassert.h"
43 #include "libswscale/swscale.h"
45 static const char *const var_names[] = {
92 VAR_S2R_MAIN_DAR, VAR_S2R_MDAR,
107 typedef struct ScaleContext {
108 const AVClass *class;
109 struct SwsContext *sws; ///< software scaler context
110 struct SwsContext *isws[2]; ///< software scaler context for interlaced material
114 * New dimensions. Special values are:
115 * 0 = original width/height
116 * -1 = keep original aspect
117 * -N = try to keep aspect but make sure it is divisible by N
121 unsigned int flags; ///sws flags
122 double param[2]; // sws params
124 int hsub, vsub; ///< chroma subsampling
125 int slice_y; ///< top of current output slice
126 int input_is_pal; ///< set to 1 if the input format is paletted
127 int output_is_pal; ///< set to 1 if the output format is paletted
130 char *w_expr; ///< width expression string
131 char *h_expr; ///< height expression string
134 double var_values[VARS_NB];
138 char *in_color_matrix;
139 char *out_color_matrix;
149 int force_original_aspect_ratio;
150 int force_divisible_by;
154 int eval_mode; ///< expression evaluation mode
158 const AVFilter ff_vf_scale2ref;
160 static int config_props(AVFilterLink *outlink);
162 static int check_exprs(AVFilterContext *ctx)
164 ScaleContext *scale = ctx->priv;
165 unsigned vars_w[VARS_NB] = { 0 }, vars_h[VARS_NB] = { 0 };
167 if (!scale->w_pexpr && !scale->h_pexpr)
168 return AVERROR(EINVAL);
171 av_expr_count_vars(scale->w_pexpr, vars_w, VARS_NB);
173 av_expr_count_vars(scale->h_pexpr, vars_h, VARS_NB);
175 if (vars_w[VAR_OUT_W] || vars_w[VAR_OW]) {
176 av_log(ctx, AV_LOG_ERROR, "Width expression cannot be self-referencing: '%s'.\n", scale->w_expr);
177 return AVERROR(EINVAL);
180 if (vars_h[VAR_OUT_H] || vars_h[VAR_OH]) {
181 av_log(ctx, AV_LOG_ERROR, "Height expression cannot be self-referencing: '%s'.\n", scale->h_expr);
182 return AVERROR(EINVAL);
185 if ((vars_w[VAR_OUT_H] || vars_w[VAR_OH]) &&
186 (vars_h[VAR_OUT_W] || vars_h[VAR_OW])) {
187 av_log(ctx, AV_LOG_WARNING, "Circular references detected for width '%s' and height '%s' - possibly invalid.\n", scale->w_expr, scale->h_expr);
190 if (ctx->filter != &ff_vf_scale2ref &&
191 (vars_w[VAR_S2R_MAIN_W] || vars_h[VAR_S2R_MAIN_W] ||
192 vars_w[VAR_S2R_MAIN_H] || vars_h[VAR_S2R_MAIN_H] ||
193 vars_w[VAR_S2R_MAIN_A] || vars_h[VAR_S2R_MAIN_A] ||
194 vars_w[VAR_S2R_MAIN_SAR] || vars_h[VAR_S2R_MAIN_SAR] ||
195 vars_w[VAR_S2R_MAIN_DAR] || vars_h[VAR_S2R_MAIN_DAR] ||
196 vars_w[VAR_S2R_MDAR] || vars_h[VAR_S2R_MDAR] ||
197 vars_w[VAR_S2R_MAIN_HSUB] || vars_h[VAR_S2R_MAIN_HSUB] ||
198 vars_w[VAR_S2R_MAIN_VSUB] || vars_h[VAR_S2R_MAIN_VSUB] ||
199 vars_w[VAR_S2R_MAIN_N] || vars_h[VAR_S2R_MAIN_N] ||
200 vars_w[VAR_S2R_MAIN_T] || vars_h[VAR_S2R_MAIN_T] ||
201 vars_w[VAR_S2R_MAIN_POS] || vars_h[VAR_S2R_MAIN_POS]) ) {
202 av_log(ctx, AV_LOG_ERROR, "Expressions with scale2ref variables are not valid in scale filter.\n");
203 return AVERROR(EINVAL);
206 if (scale->eval_mode == EVAL_MODE_INIT &&
207 (vars_w[VAR_N] || vars_h[VAR_N] ||
208 vars_w[VAR_T] || vars_h[VAR_T] ||
209 vars_w[VAR_POS] || vars_h[VAR_POS] ||
210 vars_w[VAR_S2R_MAIN_N] || vars_h[VAR_S2R_MAIN_N] ||
211 vars_w[VAR_S2R_MAIN_T] || vars_h[VAR_S2R_MAIN_T] ||
212 vars_w[VAR_S2R_MAIN_POS] || vars_h[VAR_S2R_MAIN_POS]) ) {
213 av_log(ctx, AV_LOG_ERROR, "Expressions with frame variables 'n', 't', 'pos' are not valid in init eval_mode.\n");
214 return AVERROR(EINVAL);
220 static int scale_parse_expr(AVFilterContext *ctx, char *str_expr, AVExpr **pexpr_ptr, const char *var, const char *args)
222 ScaleContext *scale = ctx->priv;
223 int ret, is_inited = 0;
224 char *old_str_expr = NULL;
225 AVExpr *old_pexpr = NULL;
228 old_str_expr = av_strdup(str_expr);
230 return AVERROR(ENOMEM);
231 av_opt_set(scale, var, args, 0);
235 old_pexpr = *pexpr_ptr;
240 ret = av_expr_parse(pexpr_ptr, args, var_names,
241 NULL, NULL, NULL, NULL, 0, ctx);
243 av_log(ctx, AV_LOG_ERROR, "Cannot parse expression for %s: '%s'\n", var, args);
247 ret = check_exprs(ctx);
251 if (is_inited && (ret = config_props(ctx->outputs[0])) < 0)
254 av_expr_free(old_pexpr);
256 av_freep(&old_str_expr);
261 av_expr_free(*pexpr_ptr);
264 av_opt_set(scale, var, old_str_expr, 0);
265 av_free(old_str_expr);
268 *pexpr_ptr = old_pexpr;
273 static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
275 ScaleContext *scale = ctx->priv;
278 if (scale->size_str && (scale->w_expr || scale->h_expr)) {
279 av_log(ctx, AV_LOG_ERROR,
280 "Size and width/height expressions cannot be set at the same time.\n");
281 return AVERROR(EINVAL);
284 if (scale->w_expr && !scale->h_expr)
285 FFSWAP(char *, scale->w_expr, scale->size_str);
287 if (scale->size_str) {
289 if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
290 av_log(ctx, AV_LOG_ERROR,
291 "Invalid size '%s'\n", scale->size_str);
294 snprintf(buf, sizeof(buf)-1, "%d", scale->w);
295 av_opt_set(scale, "w", buf, 0);
296 snprintf(buf, sizeof(buf)-1, "%d", scale->h);
297 av_opt_set(scale, "h", buf, 0);
300 av_opt_set(scale, "w", "iw", 0);
302 av_opt_set(scale, "h", "ih", 0);
304 ret = scale_parse_expr(ctx, NULL, &scale->w_pexpr, "width", scale->w_expr);
308 ret = scale_parse_expr(ctx, NULL, &scale->h_pexpr, "height", scale->h_expr);
312 av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
313 scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
317 if (scale->flags_str) {
318 const AVClass *class = sws_get_class();
319 const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
320 AV_OPT_SEARCH_FAKE_OBJ);
321 int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
331 static av_cold void uninit(AVFilterContext *ctx)
333 ScaleContext *scale = ctx->priv;
334 av_expr_free(scale->w_pexpr);
335 av_expr_free(scale->h_pexpr);
336 scale->w_pexpr = scale->h_pexpr = NULL;
337 sws_freeContext(scale->sws);
338 sws_freeContext(scale->isws[0]);
339 sws_freeContext(scale->isws[1]);
341 av_dict_free(&scale->opts);
344 static int query_formats(AVFilterContext *ctx)
346 AVFilterFormats *formats;
347 enum AVPixelFormat pix_fmt;
350 if (ctx->inputs[0]) {
351 const AVPixFmtDescriptor *desc = NULL;
353 while ((desc = av_pix_fmt_desc_next(desc))) {
354 pix_fmt = av_pix_fmt_desc_get_id(desc);
355 if ((sws_isSupportedInput(pix_fmt) ||
356 sws_isSupportedEndiannessConversion(pix_fmt))
357 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
361 if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->outcfg.formats)) < 0)
364 if (ctx->outputs[0]) {
365 const AVPixFmtDescriptor *desc = NULL;
367 while ((desc = av_pix_fmt_desc_next(desc))) {
368 pix_fmt = av_pix_fmt_desc_get_id(desc);
369 if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
370 sws_isSupportedEndiannessConversion(pix_fmt))
371 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
375 if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->incfg.formats)) < 0)
382 static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
387 if (s && strstr(s, "bt709")) {
388 colorspace = AVCOL_SPC_BT709;
389 } else if (s && strstr(s, "fcc")) {
390 colorspace = AVCOL_SPC_FCC;
391 } else if (s && strstr(s, "smpte240m")) {
392 colorspace = AVCOL_SPC_SMPTE240M;
393 } else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
394 colorspace = AVCOL_SPC_BT470BG;
395 } else if (s && strstr(s, "bt2020")) {
396 colorspace = AVCOL_SPC_BT2020_NCL;
399 if (colorspace < 1 || colorspace > 10 || colorspace == 8) {
400 colorspace = AVCOL_SPC_BT470BG;
403 return sws_getCoefficients(colorspace);
406 static int scale_eval_dimensions(AVFilterContext *ctx)
408 ScaleContext *scale = ctx->priv;
409 const char scale2ref = ctx->filter == &ff_vf_scale2ref;
410 const AVFilterLink *inlink = scale2ref ? ctx->inputs[1] : ctx->inputs[0];
411 const AVFilterLink *outlink = ctx->outputs[0];
412 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
413 const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
418 const AVPixFmtDescriptor *main_desc;
419 const AVFilterLink *main_link;
422 main_link = ctx->inputs[0];
423 main_desc = av_pix_fmt_desc_get(main_link->format);
426 scale->var_values[VAR_IN_W] = scale->var_values[VAR_IW] = inlink->w;
427 scale->var_values[VAR_IN_H] = scale->var_values[VAR_IH] = inlink->h;
428 scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = NAN;
429 scale->var_values[VAR_OUT_H] = scale->var_values[VAR_OH] = NAN;
430 scale->var_values[VAR_A] = (double) inlink->w / inlink->h;
431 scale->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
432 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
433 scale->var_values[VAR_DAR] = scale->var_values[VAR_A] * scale->var_values[VAR_SAR];
434 scale->var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
435 scale->var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
436 scale->var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
437 scale->var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
440 scale->var_values[VAR_S2R_MAIN_W] = main_link->w;
441 scale->var_values[VAR_S2R_MAIN_H] = main_link->h;
442 scale->var_values[VAR_S2R_MAIN_A] = (double) main_link->w / main_link->h;
443 scale->var_values[VAR_S2R_MAIN_SAR] = main_link->sample_aspect_ratio.num ?
444 (double) main_link->sample_aspect_ratio.num / main_link->sample_aspect_ratio.den : 1;
445 scale->var_values[VAR_S2R_MAIN_DAR] = scale->var_values[VAR_S2R_MDAR] =
446 scale->var_values[VAR_S2R_MAIN_A] * scale->var_values[VAR_S2R_MAIN_SAR];
447 scale->var_values[VAR_S2R_MAIN_HSUB] = 1 << main_desc->log2_chroma_w;
448 scale->var_values[VAR_S2R_MAIN_VSUB] = 1 << main_desc->log2_chroma_h;
451 res = av_expr_eval(scale->w_pexpr, scale->var_values, NULL);
452 eval_w = scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
454 res = av_expr_eval(scale->h_pexpr, scale->var_values, NULL);
456 expr = scale->h_expr;
457 ret = AVERROR(EINVAL);
460 eval_h = scale->var_values[VAR_OUT_H] = scale->var_values[VAR_OH] = (int) res == 0 ? inlink->h : (int) res;
462 res = av_expr_eval(scale->w_pexpr, scale->var_values, NULL);
464 expr = scale->w_expr;
465 ret = AVERROR(EINVAL);
468 eval_w = scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
476 av_log(ctx, AV_LOG_ERROR,
477 "Error when evaluating the expression '%s'.\n", expr);
481 static int config_props(AVFilterLink *outlink)
483 AVFilterContext *ctx = outlink->src;
484 AVFilterLink *inlink0 = outlink->src->inputs[0];
485 AVFilterLink *inlink = ctx->filter == &ff_vf_scale2ref ?
486 outlink->src->inputs[1] :
487 outlink->src->inputs[0];
488 enum AVPixelFormat outfmt = outlink->format;
489 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
490 ScaleContext *scale = ctx->priv;
493 if ((ret = scale_eval_dimensions(ctx)) < 0)
496 ff_scale_adjust_dimensions(inlink, &scale->w, &scale->h,
497 scale->force_original_aspect_ratio,
498 scale->force_divisible_by);
500 if (scale->w > INT_MAX ||
501 scale->h > INT_MAX ||
502 (scale->h * inlink->w) > INT_MAX ||
503 (scale->w * inlink->h) > INT_MAX)
504 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
506 outlink->w = scale->w;
507 outlink->h = scale->h;
509 /* TODO: make algorithm configurable */
511 scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL;
512 if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
513 scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL;
516 sws_freeContext(scale->sws);
518 sws_freeContext(scale->isws[0]);
520 sws_freeContext(scale->isws[1]);
521 scale->isws[0] = scale->isws[1] = scale->sws = NULL;
522 if (inlink0->w == outlink->w &&
523 inlink0->h == outlink->h &&
524 !scale->out_color_matrix &&
525 scale->in_range == scale->out_range &&
526 inlink0->format == outlink->format)
529 struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
532 for (i = 0; i < 3; i++) {
533 int in_v_chr_pos = scale->in_v_chr_pos, out_v_chr_pos = scale->out_v_chr_pos;
534 struct SwsContext **s = swscs[i];
535 *s = sws_alloc_context();
537 return AVERROR(ENOMEM);
539 av_opt_set_int(*s, "srcw", inlink0 ->w, 0);
540 av_opt_set_int(*s, "srch", inlink0 ->h >> !!i, 0);
541 av_opt_set_int(*s, "src_format", inlink0->format, 0);
542 av_opt_set_int(*s, "dstw", outlink->w, 0);
543 av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);
544 av_opt_set_int(*s, "dst_format", outfmt, 0);
545 av_opt_set_int(*s, "sws_flags", scale->flags, 0);
546 av_opt_set_int(*s, "param0", scale->param[0], 0);
547 av_opt_set_int(*s, "param1", scale->param[1], 0);
548 if (scale->in_range != AVCOL_RANGE_UNSPECIFIED)
549 av_opt_set_int(*s, "src_range",
550 scale->in_range == AVCOL_RANGE_JPEG, 0);
551 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
552 av_opt_set_int(*s, "dst_range",
553 scale->out_range == AVCOL_RANGE_JPEG, 0);
556 AVDictionaryEntry *e = NULL;
557 while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
558 if ((ret = av_opt_set(*s, e->key, e->value, 0)) < 0)
562 /* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
563 * MPEG-2 chroma positions are used by convention
564 * XXX: support other 4:2:0 pixel formats */
565 if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
566 in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
569 if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
570 out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
573 av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
574 av_opt_set_int(*s, "src_v_chr_pos", in_v_chr_pos, 0);
575 av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
576 av_opt_set_int(*s, "dst_v_chr_pos", out_v_chr_pos, 0);
578 if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
580 if (!scale->interlaced)
585 if (inlink0->sample_aspect_ratio.num){
586 outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink0->w, outlink->w * inlink0->h}, inlink0->sample_aspect_ratio);
588 outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
590 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",
591 inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
592 inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
593 outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
594 outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
602 static int config_props_ref(AVFilterLink *outlink)
604 AVFilterLink *inlink = outlink->src->inputs[1];
606 outlink->w = inlink->w;
607 outlink->h = inlink->h;
608 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
609 outlink->time_base = inlink->time_base;
610 outlink->frame_rate = inlink->frame_rate;
615 static int request_frame(AVFilterLink *outlink)
617 return ff_request_frame(outlink->src->inputs[0]);
620 static int request_frame_ref(AVFilterLink *outlink)
622 return ff_request_frame(outlink->src->inputs[1]);
625 static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
627 ScaleContext *scale = link->dst->priv;
628 const uint8_t *in[4];
630 int in_stride[4],out_stride[4];
633 for (i=0; i<4; i++) {
634 int vsub= ((i+1)&2) ? scale->vsub : 0;
635 in_stride[i] = cur_pic->linesize[i] * mul;
636 out_stride[i] = out_buf->linesize[i] * mul;
637 in[i] = FF_PTR_ADD(cur_pic->data[i], ((y>>vsub)+field) * cur_pic->linesize[i]);
638 out[i] = FF_PTR_ADD(out_buf->data[i], field * out_buf->linesize[i]);
640 if (scale->input_is_pal)
641 in[1] = cur_pic->data[1];
642 if (scale->output_is_pal)
643 out[1] = out_buf->data[1];
645 return sws_scale(sws, in, in_stride, y/mul, h,
649 static int scale_frame(AVFilterLink *link, AVFrame *in, AVFrame **frame_out)
651 AVFilterContext *ctx = link->dst;
652 ScaleContext *scale = ctx->priv;
653 AVFilterLink *outlink = ctx->outputs[0];
655 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
661 if (in->colorspace == AVCOL_SPC_YCGCO)
662 av_log(link->dst, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
664 frame_changed = in->width != link->w ||
665 in->height != link->h ||
666 in->format != link->format ||
667 in->sample_aspect_ratio.den != link->sample_aspect_ratio.den ||
668 in->sample_aspect_ratio.num != link->sample_aspect_ratio.num;
670 if (scale->eval_mode == EVAL_MODE_FRAME || frame_changed) {
672 unsigned vars_w[VARS_NB] = { 0 }, vars_h[VARS_NB] = { 0 };
674 av_expr_count_vars(scale->w_pexpr, vars_w, VARS_NB);
675 av_expr_count_vars(scale->h_pexpr, vars_h, VARS_NB);
677 if (scale->eval_mode == EVAL_MODE_FRAME &&
679 ctx->filter != &ff_vf_scale2ref &&
680 !(vars_w[VAR_N] || vars_w[VAR_T] || vars_w[VAR_POS]) &&
681 !(vars_h[VAR_N] || vars_h[VAR_T] || vars_h[VAR_POS]) &&
682 scale->w && scale->h)
685 if (scale->eval_mode == EVAL_MODE_INIT) {
686 snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
687 av_opt_set(scale, "w", buf, 0);
688 snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
689 av_opt_set(scale, "h", buf, 0);
691 ret = scale_parse_expr(ctx, NULL, &scale->w_pexpr, "width", scale->w_expr);
695 ret = scale_parse_expr(ctx, NULL, &scale->h_pexpr, "height", scale->h_expr);
700 if (ctx->filter == &ff_vf_scale2ref) {
701 scale->var_values[VAR_S2R_MAIN_N] = link->frame_count_out;
702 scale->var_values[VAR_S2R_MAIN_T] = TS2T(in->pts, link->time_base);
703 scale->var_values[VAR_S2R_MAIN_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
705 scale->var_values[VAR_N] = link->frame_count_out;
706 scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
707 scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
710 link->dst->inputs[0]->format = in->format;
711 link->dst->inputs[0]->w = in->width;
712 link->dst->inputs[0]->h = in->height;
714 link->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
715 link->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
717 if ((ret = config_props(outlink)) < 0)
727 scale->hsub = desc->log2_chroma_w;
728 scale->vsub = desc->log2_chroma_h;
730 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
733 return AVERROR(ENOMEM);
737 av_frame_copy_props(out, in);
738 out->width = outlink->w;
739 out->height = outlink->h;
741 if (scale->output_is_pal)
742 avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
744 in_range = in->color_range;
746 if ( scale->in_color_matrix
747 || scale->out_color_matrix
748 || scale-> in_range != AVCOL_RANGE_UNSPECIFIED
749 || in_range != AVCOL_RANGE_UNSPECIFIED
750 || scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
751 int in_full, out_full, brightness, contrast, saturation;
752 const int *inv_table, *table;
754 sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
755 (int **)&table, &out_full,
756 &brightness, &contrast, &saturation);
758 if (scale->in_color_matrix)
759 inv_table = parse_yuv_type(scale->in_color_matrix, in->colorspace);
760 if (scale->out_color_matrix)
761 table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);
762 else if (scale->in_color_matrix)
765 if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
766 in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
767 else if (in_range != AVCOL_RANGE_UNSPECIFIED)
768 in_full = (in_range == AVCOL_RANGE_JPEG);
769 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
770 out_full = (scale->out_range == AVCOL_RANGE_JPEG);
772 sws_setColorspaceDetails(scale->sws, inv_table, in_full,
774 brightness, contrast, saturation);
776 sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
778 brightness, contrast, saturation);
780 sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
782 brightness, contrast, saturation);
784 out->color_range = out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
787 av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
788 (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
789 (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
792 if (scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)) {
793 scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
794 scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);
795 } else if (scale->nb_slices) {
796 int i, slice_h, slice_start, slice_end = 0;
797 const int nb_slices = FFMIN(scale->nb_slices, link->h);
798 for (i = 0; i < nb_slices; i++) {
799 slice_start = slice_end;
800 slice_end = (link->h * (i+1)) / nb_slices;
801 slice_h = slice_end - slice_start;
802 scale_slice(link, out, in, scale->sws, slice_start, slice_h, 1, 0);
805 scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);
812 static int filter_frame(AVFilterLink *link, AVFrame *in)
814 AVFilterContext *ctx = link->dst;
815 AVFilterLink *outlink = ctx->outputs[0];
819 ret = scale_frame(link, in, &out);
821 return ff_filter_frame(outlink, out);
826 static int filter_frame_ref(AVFilterLink *link, AVFrame *in)
828 ScaleContext *scale = link->dst->priv;
829 AVFilterLink *outlink = link->dst->outputs[1];
832 frame_changed = in->width != link->w ||
833 in->height != link->h ||
834 in->format != link->format ||
835 in->sample_aspect_ratio.den != link->sample_aspect_ratio.den ||
836 in->sample_aspect_ratio.num != link->sample_aspect_ratio.num;
839 link->format = in->format;
841 link->h = in->height;
842 link->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
843 link->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
845 config_props_ref(outlink);
848 if (scale->eval_mode == EVAL_MODE_FRAME) {
849 scale->var_values[VAR_N] = link->frame_count_out;
850 scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
851 scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
854 return ff_filter_frame(outlink, in);
857 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
858 char *res, int res_len, int flags)
860 ScaleContext *scale = ctx->priv;
865 w = !strcmp(cmd, "width") || !strcmp(cmd, "w");
866 h = !strcmp(cmd, "height") || !strcmp(cmd, "h");
869 str_expr = w ? scale->w_expr : scale->h_expr;
870 pexpr_ptr = w ? &scale->w_pexpr : &scale->h_pexpr;
872 ret = scale_parse_expr(ctx, str_expr, pexpr_ptr, cmd, args);
874 ret = AVERROR(ENOSYS);
877 av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n");
882 static const AVClass *child_class_iterate(void **iter)
884 const AVClass *c = *iter ? NULL : sws_get_class();
885 *iter = (void*)(uintptr_t)c;
889 #define OFFSET(x) offsetof(ScaleContext, x)
890 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
891 #define TFLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
893 static const AVOption scale_options[] = {
894 { "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
895 { "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
896 { "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
897 { "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
898 { "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
899 { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_BOOL, {.i64 = 0 }, -1, 1, FLAGS },
900 { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
901 { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
902 { "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS, "color" },
903 { "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS, "color"},
904 { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .str = "auto" }, 0, 0, FLAGS, "color" },
905 { "bt601", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt601" }, 0, 0, FLAGS, "color" },
906 { "bt470", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt470" }, 0, 0, FLAGS, "color" },
907 { "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, { .str = "smpte170m" }, 0, 0, FLAGS, "color" },
908 { "bt709", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt709" }, 0, 0, FLAGS, "color" },
909 { "fcc", NULL, 0, AV_OPT_TYPE_CONST, { .str = "fcc" }, 0, 0, FLAGS, "color" },
910 { "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, { .str = "smpte240m" }, 0, 0, FLAGS, "color" },
911 { "bt2020", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt2020" }, 0, 0, FLAGS, "color" },
912 { "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
913 { "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
914 { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
915 { "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
916 { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
917 { "limited",NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
918 { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
919 { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
920 { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
921 { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
922 { "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 },
923 { "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 },
924 { "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 },
925 { "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 },
926 { "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" },
927 { "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
928 { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
929 { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
930 { "force_divisible_by", "enforce that the output resolution is divisible by a defined integer when force_original_aspect_ratio is used", OFFSET(force_divisible_by), AV_OPT_TYPE_INT, { .i64 = 1}, 1, 256, FLAGS },
931 { "param0", "Scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
932 { "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
933 { "nb_slices", "set the number of slices (debug purpose only)", OFFSET(nb_slices), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
934 { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
935 { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
936 { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
940 static const AVClass scale_class = {
941 .class_name = "scale",
942 .item_name = av_default_item_name,
943 .option = scale_options,
944 .version = LIBAVUTIL_VERSION_INT,
945 .category = AV_CLASS_CATEGORY_FILTER,
946 .child_class_iterate = child_class_iterate,
949 static const AVFilterPad avfilter_vf_scale_inputs[] = {
952 .type = AVMEDIA_TYPE_VIDEO,
953 .filter_frame = filter_frame,
958 static const AVFilterPad avfilter_vf_scale_outputs[] = {
961 .type = AVMEDIA_TYPE_VIDEO,
962 .config_props = config_props,
967 const AVFilter ff_vf_scale = {
969 .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
970 .init_dict = init_dict,
972 .query_formats = query_formats,
973 .priv_size = sizeof(ScaleContext),
974 .priv_class = &scale_class,
975 .inputs = avfilter_vf_scale_inputs,
976 .outputs = avfilter_vf_scale_outputs,
977 .process_command = process_command,
980 static const AVClass scale2ref_class = {
981 .class_name = "scale2ref",
982 .item_name = av_default_item_name,
983 .option = scale_options,
984 .version = LIBAVUTIL_VERSION_INT,
985 .category = AV_CLASS_CATEGORY_FILTER,
986 .child_class_iterate = child_class_iterate,
989 static const AVFilterPad avfilter_vf_scale2ref_inputs[] = {
992 .type = AVMEDIA_TYPE_VIDEO,
993 .filter_frame = filter_frame,
997 .type = AVMEDIA_TYPE_VIDEO,
998 .filter_frame = filter_frame_ref,
1003 static const AVFilterPad avfilter_vf_scale2ref_outputs[] = {
1006 .type = AVMEDIA_TYPE_VIDEO,
1007 .config_props = config_props,
1008 .request_frame= request_frame,
1012 .type = AVMEDIA_TYPE_VIDEO,
1013 .config_props = config_props_ref,
1014 .request_frame= request_frame_ref,
1019 const AVFilter ff_vf_scale2ref = {
1020 .name = "scale2ref",
1021 .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference."),
1022 .init_dict = init_dict,
1024 .query_formats = query_formats,
1025 .priv_size = sizeof(ScaleContext),
1026 .priv_class = &scale2ref_class,
1027 .inputs = avfilter_vf_scale2ref_inputs,
1028 .outputs = avfilter_vf_scale2ref_outputs,
1029 .process_command = process_command,