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
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[] = {
72 struct SwsContext *sws; ///< software scaler context
73 struct SwsContext *isws[2]; ///< software scaler context for interlaced material
76 * New dimensions. Special values are:
77 * 0 = original width/height
78 * -1 = keep original aspect
82 unsigned int flags; ///sws flags
84 int hsub, vsub; ///< chroma subsampling
85 int slice_y; ///< top of current output slice
86 int input_is_pal; ///< set to 1 if the input format is paletted
87 int output_is_pal; ///< set to 1 if the output format is paletted
90 char *w_expr; ///< width expression string
91 char *h_expr; ///< height expression string
94 char *in_color_matrix;
95 char *out_color_matrix;
105 int force_original_aspect_ratio;
108 static av_cold int init(AVFilterContext *ctx)
110 ScaleContext *scale = ctx->priv;
113 if (scale->size_str && (scale->w_expr || scale->h_expr)) {
114 av_log(ctx, AV_LOG_ERROR,
115 "Size and width/height expressions cannot be set at the same time.\n");
116 return AVERROR(EINVAL);
119 if (scale->w_expr && !scale->h_expr)
120 FFSWAP(char *, scale->w_expr, scale->size_str);
122 if (scale->size_str) {
124 if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
125 av_log(ctx, AV_LOG_ERROR,
126 "Invalid size '%s'\n", scale->size_str);
129 snprintf(buf, sizeof(buf)-1, "%d", scale->w);
130 av_opt_set(scale, "w", buf, 0);
131 snprintf(buf, sizeof(buf)-1, "%d", scale->h);
132 av_opt_set(scale, "h", buf, 0);
135 av_opt_set(scale, "w", "iw", 0);
137 av_opt_set(scale, "h", "ih", 0);
139 av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
140 scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
142 scale->flags = SWS_BILINEAR;
144 if (scale->flags_str) {
145 const AVClass *class = sws_get_class();
146 const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
147 AV_OPT_SEARCH_FAKE_OBJ);
148 int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
156 static av_cold void uninit(AVFilterContext *ctx)
158 ScaleContext *scale = ctx->priv;
159 sws_freeContext(scale->sws);
160 sws_freeContext(scale->isws[0]);
161 sws_freeContext(scale->isws[1]);
165 static int query_formats(AVFilterContext *ctx)
167 AVFilterFormats *formats;
168 enum AVPixelFormat pix_fmt;
171 if (ctx->inputs[0]) {
173 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
174 if ((sws_isSupportedInput(pix_fmt) ||
175 sws_isSupportedEndiannessConversion(pix_fmt))
176 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
177 ff_formats_unref(&formats);
180 ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
182 if (ctx->outputs[0]) {
184 for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
185 if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
186 sws_isSupportedEndiannessConversion(pix_fmt))
187 && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
188 ff_formats_unref(&formats);
191 ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
197 static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
202 if (s && strstr(s, "bt709")) {
203 colorspace = AVCOL_SPC_BT709;
204 } else if (s && strstr(s, "fcc")) {
205 colorspace = AVCOL_SPC_FCC;
206 } else if (s && strstr(s, "smpte240m")) {
207 colorspace = AVCOL_SPC_SMPTE240M;
208 } else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
209 colorspace = AVCOL_SPC_BT470BG;
212 if (colorspace < 1 || colorspace > 7) {
213 colorspace = AVCOL_SPC_BT470BG;
216 return sws_getCoefficients(colorspace);
219 static int config_props(AVFilterLink *outlink)
221 AVFilterContext *ctx = outlink->src;
222 AVFilterLink *inlink = outlink->src->inputs[0];
223 enum AVPixelFormat outfmt = outlink->format;
224 ScaleContext *scale = ctx->priv;
225 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
227 double var_values[VARS_NB], res;
231 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
232 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
233 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
234 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
235 var_values[VAR_A] = (double) inlink->w / inlink->h;
236 var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
237 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
238 var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
239 var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
240 var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
242 /* evaluate width and height */
243 av_expr_parse_and_eval(&res, (expr = scale->w_expr),
244 var_names, var_values,
245 NULL, NULL, NULL, NULL, NULL, 0, ctx);
246 scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
247 if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),
248 var_names, var_values,
249 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
251 scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
252 /* evaluate again the width, as it may depend on the output height */
253 if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
254 var_names, var_values,
255 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
262 /* sanity check params */
263 if (w < -1 || h < -1) {
264 av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
265 return AVERROR(EINVAL);
267 if (w == -1 && h == -1)
268 scale->w = scale->h = 0;
275 w = av_rescale(h, inlink->w, inlink->h);
277 h = av_rescale(w, inlink->h, inlink->w);
279 if (scale->force_original_aspect_ratio) {
280 int tmp_w = av_rescale(h, inlink->w, inlink->h);
281 int tmp_h = av_rescale(w, inlink->h, inlink->w);
283 if (scale->force_original_aspect_ratio == 1) {
292 if (w > INT_MAX || h > INT_MAX ||
293 (h * inlink->w) > INT_MAX ||
294 (w * inlink->h) > INT_MAX)
295 av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
300 /* TODO: make algorithm configurable */
302 scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||
303 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
304 if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
305 scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL ||
306 av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
309 sws_freeContext(scale->sws);
311 sws_freeContext(scale->isws[0]);
313 sws_freeContext(scale->isws[1]);
314 scale->isws[0] = scale->isws[1] = scale->sws = NULL;
315 if (inlink->w == outlink->w && inlink->h == outlink->h &&
316 inlink->format == outlink->format)
319 struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
322 for (i = 0; i < 3; i++) {
323 struct SwsContext **s = swscs[i];
324 *s = sws_alloc_context();
326 return AVERROR(ENOMEM);
328 av_opt_set_int(*s, "srcw", inlink ->w, 0);
329 av_opt_set_int(*s, "srch", inlink ->h >> !!i, 0);
330 av_opt_set_int(*s, "src_format", inlink->format, 0);
331 av_opt_set_int(*s, "dstw", outlink->w, 0);
332 av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);
333 av_opt_set_int(*s, "dst_format", outfmt, 0);
334 av_opt_set_int(*s, "sws_flags", scale->flags, 0);
336 av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
337 av_opt_set_int(*s, "src_v_chr_pos", scale->in_v_chr_pos, 0);
338 av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
339 av_opt_set_int(*s, "dst_v_chr_pos", scale->out_v_chr_pos, 0);
341 if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
343 if (!scale->interlaced)
348 if (inlink->sample_aspect_ratio.num){
349 outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink->w, outlink->w * inlink->h}, inlink->sample_aspect_ratio);
351 outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
353 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",
354 inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
355 inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
356 outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
357 outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
362 av_log(NULL, AV_LOG_ERROR,
363 "Error when evaluating the expression '%s'.\n"
364 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
365 expr, scale->w_expr, scale->h_expr);
369 static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
371 ScaleContext *scale = link->dst->priv;
372 const uint8_t *in[4];
374 int in_stride[4],out_stride[4];
378 int vsub= ((i+1)&2) ? scale->vsub : 0;
379 in_stride[i] = cur_pic->linesize[i] * mul;
380 out_stride[i] = out_buf->linesize[i] * mul;
381 in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
382 out[i] = out_buf->data[i] + field * out_buf->linesize[i];
384 if(scale->input_is_pal)
385 in[1] = cur_pic->data[1];
386 if(scale->output_is_pal)
387 out[1] = out_buf->data[1];
389 return sws_scale(sws, in, in_stride, y/mul, h,
393 static int filter_frame(AVFilterLink *link, AVFrame *in)
395 ScaleContext *scale = link->dst->priv;
396 AVFilterLink *outlink = link->dst->outputs[0];
398 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
402 if( in->width != link->w
403 || in->height != link->h
404 || in->format != link->format) {
406 snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
407 av_opt_set(scale, "w", buf, 0);
408 snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
409 av_opt_set(scale, "h", buf, 0);
411 link->dst->inputs[0]->format = in->format;
412 link->dst->inputs[0]->w = in->width;
413 link->dst->inputs[0]->h = in->height;
415 if ((ret = config_props(outlink)) < 0)
420 return ff_filter_frame(outlink, in);
422 scale->hsub = desc->log2_chroma_w;
423 scale->vsub = desc->log2_chroma_h;
425 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
428 return AVERROR(ENOMEM);
431 av_frame_copy_props(out, in);
432 out->width = outlink->w;
433 out->height = outlink->h;
435 if(scale->output_is_pal)
436 avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
438 in_range = av_frame_get_color_range(in);
440 if ( scale->in_color_matrix
441 || scale->out_color_matrix
442 || scale-> in_range != AVCOL_RANGE_UNSPECIFIED
443 || in_range != AVCOL_RANGE_UNSPECIFIED
444 || scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
445 int in_full, out_full, brightness, contrast, saturation;
446 const int *inv_table, *table;
448 sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
449 (int **)&table, &out_full,
450 &brightness, &contrast, &saturation);
452 if (scale->in_color_matrix)
453 inv_table = parse_yuv_type(scale->in_color_matrix, av_frame_get_colorspace(in));
454 if (scale->out_color_matrix)
455 table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);
457 if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
458 in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
459 else if (in_range != AVCOL_RANGE_UNSPECIFIED)
460 in_full = (in_range == AVCOL_RANGE_JPEG);
461 if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
462 out_full = (scale->out_range == AVCOL_RANGE_JPEG);
464 sws_setColorspaceDetails(scale->sws, inv_table, in_full,
466 brightness, contrast, saturation);
468 sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
470 brightness, contrast, saturation);
472 sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
474 brightness, contrast, saturation);
477 av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
478 (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
479 (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
482 if(scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)){
483 scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
484 scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);
486 scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);
490 return ff_filter_frame(outlink, out);
493 #define OFFSET(x) offsetof(ScaleContext, x)
494 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
496 static const AVOption scale_options[] = {
497 { "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
498 { "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
499 { "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
500 { "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
501 { "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
502 { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, 1, FLAGS },
503 { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
504 { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
505 { "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS },
506 { "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
507 { "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
508 { "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
509 { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
510 { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
511 { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
512 { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
513 { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
514 { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
515 { "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 },
516 { "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 },
517 { "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 },
518 { "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 },
519 { "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" },
520 { "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
521 { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
522 { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
526 AVFILTER_DEFINE_CLASS(scale);
528 static const AVFilterPad avfilter_vf_scale_inputs[] = {
531 .type = AVMEDIA_TYPE_VIDEO,
532 .filter_frame = filter_frame,
537 static const AVFilterPad avfilter_vf_scale_outputs[] = {
540 .type = AVMEDIA_TYPE_VIDEO,
541 .config_props = config_props,
546 AVFilter avfilter_vf_scale = {
548 .description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
553 .query_formats = query_formats,
555 .priv_size = sizeof(ScaleContext),
556 .priv_class = &scale_class,
558 .inputs = avfilter_vf_scale_inputs,
559 .outputs = avfilter_vf_scale_outputs,