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lavfi: add a function for counting elements in AVFilterPad arrays.

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The caller needs to know what valid indices can be passed to
avfilter_pad_get_name/type.
This commit is contained in:
Anton Khirnov 2013-03-28 08:59:13 +01:00
parent 7cdd737ba8
commit 7e8fe4be5f
3 changed files with 10 additions and 3 deletions
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1
doc/APIchanges
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@ -23,6 +23,7 @@ API changes, most recent first:
Add avfilter_init_str(), deprecate avfilter_init_filter().
Add avfilter_init_dict().
Add AVFilter.flags field and AVFILTER_FLAG_DYNAMIC_{INPUTS,OUTPUTS} flags.
Add avfilter_pad_count() for counting filter inputs/outputs.
2013-xx-xx - lavfi 3.7.0 - avfilter.h
Add AVFilter.priv_class for exporting filter options through the AVOptions API

6
libavfilter/avfilter.c
View File

@ -304,7 +304,7 @@ void avfilter_uninit(void)
next_registered_avfilter_idx = 0;
}
static int pad_count(const AVFilterPad *pads)
int avfilter_pad_count(const AVFilterPad *pads)
{
int count;
@ -377,7 +377,7 @@ AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
av_opt_set_defaults(ret->priv);
}
ret->nb_inputs = pad_count(filter->inputs);
ret->nb_inputs = avfilter_pad_count(filter->inputs);
if (ret->nb_inputs ) {
ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
if (!ret->input_pads)
@ -388,7 +388,7 @@ AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
goto err;
}
ret->nb_outputs = pad_count(filter->outputs);
ret->nb_outputs = avfilter_pad_count(filter->outputs);
if (ret->nb_outputs) {
ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
if (!ret->output_pads)

6
libavfilter/avfilter.h
View File

@ -350,6 +350,12 @@ struct AVFilterPad {
};
#endif
/**
* Get the number of elements in a NULL-terminated array of AVFilterPads (e.g.
* AVFilter.inputs/outputs).
*/
int avfilter_pad_count(const AVFilterPad *pads);
/**
* Get the name of an AVFilterPad.
*