AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){ AVBitStreamFilter *bsf= first_bitstream_filter; while(bsf){ if(!strcmp(name, bsf->name)){ AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext)); bsfc->filter= bsf; bsfc->priv_data= av_mallocz(bsf->priv_data_size); return bsfc; } bsf= bsf->next; } return NULL; }