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lavfi: tweak display aspect ratio variables in pad and scale filters

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Previously, "dar" and "a" were documented like "input display aspect
ratio", but their actual value was "in_w/in_h".

In order to avoid to break scripts which rely on the "a" variable, the
patch keeps the same semantics but fixes the corresponding docs, and
fixes the semantics of the recently added "dar" variable, which
now correctly expresses the input Display Aspect Ratio value as
"(inw_w/in_h)*sar".
This commit is contained in:
Stefano Sabatini 2011-07-27 10:58:24 +02:00
parent 0e29c4f761
commit 61d55fda2b
4 changed files with 23 additions and 11 deletions
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14
doc/filters.texi
View File

@ -1184,12 +1184,15 @@ same as @var{out_w} and @var{out_h}
x and y offsets as specified by the @var{x} and @var{y}
expressions, or NAN if not yet specified
@item dar, a
input display aspect ratio, same as @var{iw} / @var{ih}
@item a
same as @var{iw} / @var{ih}
@item sar
input sample aspect ratio
@item dar
input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
@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.
@ -1289,12 +1292,15 @@ the output (cropped) width and heigth
@item ow, oh
same as @var{out_w} and @var{out_h}
@item dar, a
input display aspect ratio, same as @var{iw} / @var{ih}
@item a
same as @var{iw} / @var{ih}
@item sar
input sample aspect ratio
@item dar
input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
@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
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@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 27
#define LIBAVFILTER_VERSION_MICRO 3
#define LIBAVFILTER_VERSION_MICRO 4
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

9
libavfilter/vf_pad.c
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@ -45,8 +45,9 @@ static const char *var_names[] = {
"out_h", "oh",
"x",
"y",
"a", "dar",
"a",
"sar",
"dar",
"hsub",
"vsub",
NULL
@ -62,8 +63,9 @@ enum var_name {
VAR_OUT_H, VAR_OH,
VAR_X,
VAR_Y,
VAR_A, VAR_DAR,
VAR_A,
VAR_SAR,
VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
@ -158,9 +160,10 @@ static int config_input(AVFilterLink *inlink)
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_DAR] = var_values[VAR_A] = (float) inlink->w / inlink->h;
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_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
var_values[VAR_HSUB] = 1<<pad->hsub;
var_values[VAR_VSUB] = 1<<pad->vsub;

9
libavfilter/vf_scale.c
View File

@ -39,8 +39,9 @@ static const char *var_names[] = {
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a", "dar",
"a",
"sar",
"dar",
"hsub",
"vsub",
NULL
@ -54,8 +55,9 @@ enum var_name {
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_A, VAR_DAR,
VAR_A,
VAR_SAR,
VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
@ -160,9 +162,10 @@ 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_DAR] = var_values[VAR_A] = (float) inlink->w / inlink->h;
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_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
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;