shape.alg

来自「Audacity是一款用於錄音和編輯聲音的、免費的開放源碼軟體。它可以執行於Ma」· ALG 代码 · 共 34 行

(SHAPE-ALG
        (NAME "shape") 
        (ARGUMENTS ("sound_type" "sin") ("sound_type" "fn") 
                ("double" "origin"))
        (START (MIN sin))	
        (TABLE "fn")
        (NOT-IN-INNER-LOOP "fn")
        (STATE 
               ("double" "time_to_index" "fn->sr")
               ("double" "origin" "origin")
               ("table_type" "the_table" "sound_to_table(fn)")
               ("sample_type *" "fcn_table" "susp->the_table->samples")		
           ("double" "table_len" "susp->the_table->length") )
        (TERMINATE (MIN sin))
        (LOGICAL-STOP (MIN sin))
        (INNER-LOOP "
                register double offset, x1;
                register long table_index;
                register double phase = sin;
                if (phase > 1.0) phase = 1.0;
                else if (phase < -1.0) phase = -1.0;
                offset = (phase + origin) * time_to_index;
                table_index = (long) offset;
                if (table_index < 0) table_index = 0;
                if (table_index >= table_len) table_index = ((long) table_len) - 1;
                    x1 = fcn_table[table_index];
                    output = (sample_type) (x1 + (offset - table_index) * 
                        (fcn_table[table_index + 1] - x1));
        ")
        (ALWAYS-SCALE sin)
        (CONSTANT "table_len" "time_to_index" "origen" "fcn_table" "the_table")
        (FINALIZATION "table_unref(susp->the_table);")
)