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lavfi/aspect: add max option

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This commit is contained in:
Stefano Sabatini 2012-10-16 18:10:59 +02:00
parent ccd6def9b3
commit 6752aac6bc
3 changed files with 18 additions and 3 deletions
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13
doc/filters.texi
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@ -3256,6 +3256,10 @@ named options, expressed as a sequence of @var{key}=@var{value} pairs,
separated by ":".
@table @option
@item max
Set the maximum integer value to use for expressing numerator and
denominator when reducing the expressed aspect ratio to a rational.
Default value is @code{100}.
@item r, ratio:
Set the aspect ratio used by the filter.
@ -3268,6 +3272,9 @@ In case the form "@var{num}:@var{den}" the @code{:} character should
be escaped.
@end table
If the keys are omitted in the named options list, the specifed values
are assumed to be @var{ratio} and @var{max} in that order.
For example to change the display aspect ratio to 16:9, specify:
@example
setdar='16:9'
@ -3283,6 +3290,12 @@ To change the sample aspect ratio to 10:11, specify:
setsar='10:11'
@end example
To set a display aspect ratio of 16:9, and specify a maximum integer value of
1000 in the aspect ratio reduction, use the command:
@example
setdar=ratio='16:9':max=1000
@end example
@section setfield
Force field for the output video frame.

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 20
#define LIBAVFILTER_VERSION_MICRO 103
#define LIBAVFILTER_VERSION_MICRO 104
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

6
libavfilter/vf_aspect.c
View File

@ -35,12 +35,14 @@ typedef struct {
const AVClass *class;
AVRational ratio;
char *ratio_str;
int max;
} AspectContext;
#define OFFSET(x) offsetof(AspectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{"max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
{"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}
@ -49,7 +51,7 @@ static const AVOption options[] = {
static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class)
{
AspectContext *aspect = ctx->priv;
static const char *shorthand[] = { "ratio", NULL };
static const char *shorthand[] = { "ratio", "max", NULL };
char c;
int ret;
AVRational q;
@ -66,7 +68,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *c
}
if (aspect->ratio_str) {
ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, 100, 0, ctx);
ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, aspect->max, 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);