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lavfi/aspect: extend syntax for the setdar and setsar filters 

Add support for named options, and deprecate old "num:den" ambiguous
syntax.
This commit is contained in:
Stefano Sabatini 2012-01-24 23:20:23 +01:00
parent b6e36a4244
commit ccd6def9b3
3 changed files with 85 additions and 17 deletions
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27
doc/filters.texi
View File

@ -3250,16 +3250,27 @@ Keep in mind that the sample aspect ratio set by the @code{setsar}
filter may be changed by later filters in the filterchain, e.g. if
another "setsar" or a "setdar" filter is applied.
The @code{setdar} and @code{setsar} filters accept a parameter string
which represents the wanted aspect ratio. The parameter can
be a floating point number string, an expression, or a string of the form
@var{num}:@var{den}, where @var{num} and @var{den} are the numerator
and denominator of the aspect ratio. If the parameter is not
specified, it is assumed the value "0:1".
The @code{setdar} and @code{setsar} filters accept a string in the
form @var{num}:@var{den} expressing an aspect ratio, or the following
named options, expressed as a sequence of @var{key}=@var{value} pairs,
separated by ":".
@table @option
@item r, ratio:
Set the aspect ratio used by the filter.
The parameter can be a floating point number string, an expression, or
a string of the form @var{num}:@var{den}, where @var{num} and
@var{den} are the numerator and denominator of the aspect ratio. If
the parameter is not specified, it is assumed the value "0".
In case the form "@var{num}:@var{den}" the @code{:} character should
be escaped.
@end table
For example to change the display aspect ratio to 16:9, specify:
@example
setdar=16:9
setdar='16:9'
@end example
The example above is equivalent to:
@ -3269,7 +3280,7 @@ setdar=1.77777
To change the sample aspect ratio to 10:11, specify:
@example
setsar=10:11
setsar='10:11'
@end example
@section setfield

2
libavfilter/version.h
View File

@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 20
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_MICRO 103
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

73
libavfilter/vf_aspect.c
View File

@ -24,6 +24,7 @@
*/
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
@ -31,19 +32,44 @@
#include "video.h"
typedef struct {
const AVClass *class;
AVRational ratio;
char *ratio_str;
} AspectContext;
static av_cold int init(AVFilterContext *ctx, const char *args)
#define OFFSET(x) offsetof(AspectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{"ratio", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{"r", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{NULL}
};
static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class)
{
AspectContext *aspect = ctx->priv;
aspect->ratio = (AVRational) {0, 1};
static const char *shorthand[] = { "ratio", NULL };
char c;
int ret;
AVRational q;
if (args) {
if (av_parse_ratio(&aspect->ratio, args, 100, 0, ctx) < 0 ||
aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
aspect->class = class;
av_opt_set_defaults(aspect);
if (sscanf(args, "%d:%d%c", &q.num, &q.den, &c) == 2) {
aspect->ratio_str = av_strdup(args);
av_log(ctx, AV_LOG_WARNING,
"num:den syntax is deprecated, please use num/den or named options instead\n");
} else if ((ret = av_opt_set_from_string(aspect, args, shorthand, "=", ":")) < 0) {
return ret;
}
if (aspect->ratio_str) {
ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, 100, 0, ctx);
if (ret < 0 || aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid string '%s' for aspect ratio.\n", args);
"Invalid string '%s' for aspect ratio\n", args);
return AVERROR(EINVAL);
}
}
@ -61,7 +87,23 @@ static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
return ff_start_frame(link->dst->outputs[0], picref);
}
static av_cold void uninit(AVFilterContext *ctx)
{
AspectContext *aspect = ctx->priv;
av_opt_free(aspect);
}
#if CONFIG_SETDAR_FILTER
#define setdar_options options
AVFILTER_DEFINE_CLASS(setdar);
static av_cold int setdar_init(AVFilterContext *ctx, const char *args)
{
return init(ctx, args, &setdar_class);
}
static int setdar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
@ -103,17 +145,29 @@ AVFilter avfilter_vf_setdar = {
.name = "setdar",
.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
.init = init,
.init = setdar_init,
.uninit = uninit,
.priv_size = sizeof(AspectContext),
.inputs = avfilter_vf_setdar_inputs,
.outputs = avfilter_vf_setdar_outputs,
.priv_class = &setdar_class,
};
#endif /* CONFIG_SETDAR_FILTER */
#if CONFIG_SETSAR_FILTER
#define setsar_options options
AVFILTER_DEFINE_CLASS(setsar);
static av_cold int setsar_init(AVFilterContext *ctx, const char *args)
{
return init(ctx, args, &setsar_class);
}
static int setsar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
@ -147,12 +201,15 @@ AVFilter avfilter_vf_setsar = {
.name = "setsar",
.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
.init = init,
.init = setsar_init,
.uninit = uninit,
.priv_size = sizeof(AspectContext),
.inputs = avfilter_vf_setsar_inputs,
.outputs = avfilter_vf_setsar_outputs,
.priv_class = &setdar_class,
};
#endif /* CONFIG_SETSAR_FILTER */