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vf_scale: add a "sar" variable 

Also create a "dar" alias for the "a" variable, for avoiding possible
confusion between dar/sar.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Stefano Sabatini 2011-07-02 17:27:31 +02:00 committed by Anton Khirnov
parent 0ec56d1144
commit 46b29397a6
3 changed files with 12 additions and 5 deletions
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5
doc/filters.texi
View File

@ -1013,9 +1013,12 @@ the output (cropped) width and heigth
@item ow, oh
same as @var{out_w} and @var{out_h}
@item a
@item dar, a
input display aspect ratio, same as @var{iw} / @var{ih}
@item sar
input sample aspect ratio
@item hsub, vsub
horizontal and vertical chroma subsample values. For example for the
pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.

2
libavfilter/avfilter.h
View File

@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MICRO 1
#define LIBAVFILTER_VERSION_MICRO 2
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

10
libavfilter/vf_scale.c
View File

@ -38,7 +38,8 @@ static const char *var_names[] = {
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a",
"a", "dar",
"sar",
"hsub",
"vsub",
NULL
@ -52,7 +53,8 @@ enum var_name {
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_A,
VAR_A, VAR_DAR,
VAR_SAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
@ -149,7 +151,9 @@ static int config_props(AVFilterLink *outlink)
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
var_values[VAR_A] = (float) inlink->w / inlink->h;
var_values[VAR_DAR] = var_values[VAR_A] = (float) inlink->w / inlink->h;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(float) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
var_values[VAR_HSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
var_values[VAR_VSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_h;