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vf_settb: switch to an AVOptions-based system.

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This commit is contained in:
Anton Khirnov 2013-02-25 21:21:29 +01:00
parent 33b97faaba
commit ffea3b00c3
2 changed files with 29 additions and 16 deletions
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14
doc/filters.texi
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@ -1998,7 +1998,15 @@ setsar=sar=10/11
Set the timebase to use for the output frames timestamps.
It is mainly useful for testing timebase configuration.
It accepts in input an arithmetic expression representing a rational.
This filter accepts the following options:
@table @option
@item expr
The expression which is evaluated into the output timebase.
@end table
The expression can contain the constants "PI", "E", "PHI", "AVTB" (the
default timebase), and "intb" (the input timebase).
@ -2008,10 +2016,10 @@ Follow some examples.
@example
# set the timebase to 1/25
settb=1/25
settb=expr=1/25
# set the timebase to 1/10
settb=0.1
settb=expr=0.1
#set the timebase to 1001/1000
settb=1+0.001

31
libavfilter/vf_settb.c
View File

@ -30,6 +30,7 @@
#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/rational.h"
#include "avfilter.h"
#include "internal.h"
@ -54,21 +55,11 @@ enum var_name {
};
typedef struct {
char tb_expr[256];
const AVClass *class;
char *tb_expr;
double var_values[VAR_VARS_NB];
} SetTBContext;
static av_cold int init(AVFilterContext *ctx, const char *args)
{
SetTBContext *settb = ctx->priv;
av_strlcpy(settb->tb_expr, "intb", sizeof(settb->tb_expr));
if (args)
sscanf(args, "%255[^:]", settb->tb_expr);
return 0;
}
static int config_output_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
@ -124,6 +115,20 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
return ff_filter_frame(outlink, frame);
}
#define OFFSET(x) offsetof(SetTBContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS },
{ NULL },
};
static const AVClass settb_class = {
.class_name = "settb",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVFilterPad avfilter_vf_settb_inputs[] = {
{
.name = "default",
@ -146,9 +151,9 @@ static const AVFilterPad avfilter_vf_settb_outputs[] = {
AVFilter avfilter_vf_settb = {
.name = "settb",
.description = NULL_IF_CONFIG_SMALL("Set timebase for the output link."),
.init = init,
.priv_size = sizeof(SetTBContext),
.priv_class = &settb_class,
.inputs = avfilter_vf_settb_inputs,