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.
-The expression can contain the constants "AVTB" (the
-default timebase), "intb" (the input timebase) and "sr" (the sample rate,
-audio only).
-
-The default value for the input is "intb".
+This filter accepts a single option @option{tb}, which can be
+specified either by setting @option{tb}=@var{VALUE} or setting the
+value alone.
+
+The value for @option{tb} is an arithmetic expression representing a
+rational. The expression can contain the constants "AVTB" (the default
+timebase), "intb" (the input timebase) and "sr" (the sample rate,
+audio only). Default value is "intb".
@subsection Examples
#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"
};
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)
+#define OFFSET(x) offsetof(SetTBContext, x)
+#define DEFINE_OPTIONS(filt_name, filt_type) \
+static const AVOption filt_name##_options[] = { \
+ { "tb", "set timebase expression", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
+ .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
+ { NULL } \
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class)
{
SetTBContext *settb = ctx->priv;
- av_strlcpy(settb->tb_expr, "intb", sizeof(settb->tb_expr));
+ static const char *shorthand[] = { "tb", NULL };
+ int ret;
- if (args)
- sscanf(args, "%255[^:]", settb->tb_expr);
+ settb->class = class;
+ av_opt_set_defaults(settb);
+
+ if ((ret = av_opt_set_from_string(settb, args, shorthand, "=", ":")) < 0)
+ return ret;
return 0;
}
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SetTBContext *settb = ctx->priv;
+ av_opt_free(settb);
+}
+
static int config_output_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
}
#if CONFIG_SETTB_FILTER
+
+DEFINE_OPTIONS(settb, VIDEO);
+AVFILTER_DEFINE_CLASS(settb);
+
+static av_cold int settb_init(AVFilterContext *ctx, const char *args)
+{
+ return init(ctx, args, &settb_class);
+}
+
static const AVFilterPad avfilter_vf_settb_inputs[] = {
{
.name = "default",
AVFilter avfilter_vf_settb = {
.name = "settb",
.description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
- .init = init,
+ .init = settb_init,
+ .uninit = uninit,
.priv_size = sizeof(SetTBContext),
.inputs = avfilter_vf_settb_inputs,
.outputs = avfilter_vf_settb_outputs,
+ .priv_class = &settb_class,
};
#endif
#if CONFIG_ASETTB_FILTER
+
+DEFINE_OPTIONS(asettb, AUDIO);
+AVFILTER_DEFINE_CLASS(asettb);
+
+static av_cold int asettb_init(AVFilterContext *ctx, const char *args)
+{
+ return init(ctx, args, &asettb_class);
+}
+
static const AVFilterPad avfilter_af_asettb_inputs[] = {
{
.name = "default",
AVFilter avfilter_af_asettb = {
.name = "asettb",
.description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
- .init = init,
+ .init = asettb_init,
+ .uninit = uninit,
.priv_size = sizeof(SetTBContext),
.inputs = avfilter_af_asettb_inputs,
.outputs = avfilter_af_asettb_outputs,
+ .priv_class = &asettb_class,
};
#endif