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https://github.com/librempeg/librempeg
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vf_aspect: support variables in evaluating the aspect ratios
Example: -vf setsar=sar="sar*9/10" Signed-off-by: Rudolf Polzer <divverent@xonotic.org> Signed-off-by: Anton Khirnov <anton@khirnov.net>
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Rudolf Polzer
Anton Khirnov
parent
5928b29f53
commit
34a0ac41a8
@ -45,6 +45,7 @@ version 10:
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- raw HEVC, HEVC in MOV/MP4, HEVC in Matroska, HEVC in MPEG-TS demuxing
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- remove avplay -vismv option, which has not worked for a long time
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- Live HDS muxer
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- setsar/setdar filters now support variables in ratio expressions
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version 9:
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@ -2049,10 +2049,35 @@ This filter accepts the following options:
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@table @option
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@item dar
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Output display aspect ratio, as a rational or a decimal number.
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Output display aspect ratio.
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@end table
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The parameter @var{dar} is an expression containing
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the following constants:
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@table @option
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@item E, PI, PHI
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the corresponding mathematical approximated values for e
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(euler number), pi (greek PI), phi (golden ratio)
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@item w, h
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the input width and height
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@item a
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same as @var{w} / @var{h}
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@item sar
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input sample aspect ratio
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@item dar
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input display aspect ratio, it is the same as (@var{w} / @var{h}) * @var{sar}
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@item hsub, vsub
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horizontal and vertical chroma subsample values. For example for the
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pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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@end table
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For example to change the display aspect ratio to 16:9, specify:
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@example
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setdar=dar=16/9
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@ -2158,10 +2183,35 @@ This filter accepts the following options:
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@table @option
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@item sar
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Output sample aspect ratio, as a rational or decimal number.
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Output sample aspect ratio.
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@end table
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The parameter @var{sar} is an expression containing
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the following constants:
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@table @option
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@item E, PI, PHI
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the corresponding mathematical approximated values for e
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(euler number), pi (greek PI), phi (golden ratio)
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@item w, h
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the input width and height
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@item a
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same as @var{w} / @var{h}
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@item sar
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input sample aspect ratio
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@item dar
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input display aspect ratio, it is the same as (@var{w} / @var{h}) * @var{sar}
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@item hsub, vsub
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horizontal and vertical chroma subsample values. For example for the
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pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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@end table
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For example to change the sample aspect ratio to 10:11, specify:
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@example
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setsar=sar=10/11
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@ -26,13 +26,42 @@
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#include <float.h>
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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static const char *const var_names[] = {
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"PI",
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"PHI",
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"E",
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"w",
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"h",
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"a", "dar",
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"sar",
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"hsub",
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"vsub",
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NULL
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};
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enum var_name {
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VAR_PI,
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VAR_PHI,
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VAR_E,
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VAR_W,
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VAR_H,
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VAR_A, VAR_DAR,
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VAR_SAR,
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VAR_HSUB,
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VAR_VSUB,
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VARS_NB
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};
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typedef struct {
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const AVClass *class;
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AVRational dar;
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@ -40,6 +69,7 @@ typedef struct {
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#if FF_API_OLD_FILTER_OPTS
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float aspect_num, aspect_den;
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#endif
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char *ratio_expr;
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} AspectContext;
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#if FF_API_OLD_FILTER_OPTS
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@ -68,12 +98,54 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
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#define OFFSET(x) offsetof(AspectContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
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{
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AVFilterContext *ctx = inlink->dst;
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AspectContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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double var_values[VARS_NB], res;
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int ret;
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var_values[VAR_PI] = M_PI;
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var_values[VAR_PHI] = M_PHI;
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var_values[VAR_E] = M_E;
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var_values[VAR_W] = inlink->w;
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var_values[VAR_H] = inlink->h;
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var_values[VAR_A] = (double) inlink->w / inlink->h;
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var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
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(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
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var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
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var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
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var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
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/* evaluate new aspect ratio*/
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if ((ret = av_expr_parse_and_eval(&res, s->ratio_expr,
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(NULL, AV_LOG_ERROR,
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"Error when evaluating the expression '%s'\n", s->ratio_expr);
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return ret;
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}
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*aspect_ratio = av_d2q(res, INT_MAX);
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return 0;
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}
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#if CONFIG_SETDAR_FILTER
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/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
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static int setdar_config_props(AVFilterLink *inlink)
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{
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AspectContext *s = inlink->dst->priv;
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AVRational dar;
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int ret;
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#if FF_API_OLD_FILTER_OPTS
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if (!(s->aspect_num > 0 && s->aspect_den > 0)) {
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#endif
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if ((ret = get_aspect_ratio(inlink, &s->dar)))
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return ret;
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#if FF_API_OLD_FILTER_OPTS
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}
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#endif
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if (s->dar.num && s->dar.den) {
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av_reduce(&s->sar.num, &s->sar.den,
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@ -98,7 +170,7 @@ static const AVOption setdar_options[] = {
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{ "dar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
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{ "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
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#endif
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{ "dar", "display aspect ratio", OFFSET(dar), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
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{ "dar", "display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
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{ NULL },
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};
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@ -150,6 +222,16 @@ AVFilter ff_vf_setdar = {
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static int setsar_config_props(AVFilterLink *inlink)
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{
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AspectContext *s = inlink->dst->priv;
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int ret;
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#if FF_API_OLD_FILTER_OPTS
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if (!(s->aspect_num > 0 && s->aspect_den > 0)) {
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#endif
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if ((ret = get_aspect_ratio(inlink, &s->sar)))
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return ret;
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#if FF_API_OLD_FILTER_OPTS
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}
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#endif
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inlink->sample_aspect_ratio = s->sar;
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@ -161,7 +243,7 @@ static const AVOption setsar_options[] = {
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{ "sar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
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{ "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
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#endif
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{ "sar", "sample (pixel) aspect ratio", OFFSET(sar), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, INT_MAX, FLAGS },
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{ "sar", "sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
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{ NULL },
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};
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