AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name) { AVFilterContext *ret = av_malloc(sizeof(AVFilterContext)); ret->av_class = av_mallocz(sizeof(AVClass)); ret->av_class->item_name = filter_name; ret->filter = filter; ret->name = inst_name ? av_strdup(inst_name) : NULL; ret->priv = av_mallocz(filter->priv_size); ret->input_count = pad_count(filter->inputs); ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count); memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count); ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count); ret->output_count = pad_count(filter->outputs); ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count); memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count); ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count); return ret; }