730 lines
38 KiB
C
730 lines
38 KiB
C
/*___________________________________________________________________________
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| Function Name : extract_h |
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| Purpose : |
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| Return the 16 MSB of L_var1. |
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| Complexity weight : 1 |
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| Inputs : |
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| L_var1 |
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| 32 bit long signed integer (Word32 ) whose value falls in the |
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| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) extract_h (Word32 L_var1)
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{
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return (Word16) (L_var1 >> 16);
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}
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/* ------------------------- End of extract_h() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : extract_l |
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| Purpose : |
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| Return the 16 LSB of L_var1. |
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| Complexity weight : 1 |
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| Inputs : |
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| L_var1 |
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| 32 bit long signed integer (Word32 ) whose value falls in the |
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| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) extract_l (Word32 L_var1)
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{
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return (Word16) L_var1;
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}
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/* ------------------------- End of extract_l() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : saturate |
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| Purpose : |
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| Limit the 32 bit input to the range of a 16 bit word. |
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| Inputs : |
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| L_var1 |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) saturate (Word32 L_var1)
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{
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Word16 val16 = (Word16) L_var1;
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if (val16 == L_var1)
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return val16;
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if (L_var1 > MAX_16)
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return MAX_16;
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return MIN_16;
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}
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/* ------------------------- End of saturate() ------------------------- */
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#if PJ_HAS_INT64
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PJ_INLINE(Word32) L_saturate (pj_int64_t LL_var1)
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{
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pj_int32_t L_var1 = (pj_int32_t)LL_var1;
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if (LL_var1 == L_var1)
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return L_var1;
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else if (LL_var1 > MAX_32)
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return MAX_32;
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else
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return MIN_32;
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}
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#endif
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/*___________________________________________________________________________
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| Function Name : add |
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| Purpose : |
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| Performs the addition (var1+var2) with overflow control and saturation;|
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| the 16 bit result is set at +32767 when overflow occurs or at -32768 |
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| when underflow occurs. |
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| Complexity weight : 1 |
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| Inputs : |
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| var1 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| var2 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) add (Word16 var1, Word16 var2)
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{
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return saturate (var1 + var2);
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}
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/* ------------------------- End of add() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : sub |
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| Purpose : |
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| Performs the subtraction (var1+var2) with overflow control and satu- |
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| ration; the 16 bit result is set at +32767 when overflow occurs or at |
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| -32768 when underflow occurs. |
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| Complexity weight : 1 |
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| Inputs : |
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| var1 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| var2 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) sub (Word16 var1, Word16 var2)
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{
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return saturate ((Word32) var1 - var2);
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}
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/* ------------------------- End of sub() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : negate |
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| Purpose : |
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| Negate var1 with saturation, saturate in the case where input is -32768:|
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| negate(var1) = sub(0,var1). |
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| Complexity weight : 1 |
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| Inputs : |
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| var1 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) negate (Word16 var1)
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{
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return (Word16)((var1 == MIN_16) ? MAX_16 : -var1);
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}
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/* ------------------------- End of negate() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : L_add |
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| Purpose : |
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| 32 bits addition of the two 32 bits variables (L_var1+L_var2) with |
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| overflow control and saturation; the result is set at +2147483647 when |
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| overflow occurs or at -2147483648 when underflow occurs. |
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| Complexity weight : 2 |
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| Inputs : |
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| L_var1 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| L_var2 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| L_var_out |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word32) L_add (Word32 L_var1, Word32 L_var2)
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{
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#if PJ_HAS_INT64
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return L_saturate(((pj_int64_t)L_var1) + L_var2);
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#else
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Word32 L_var_out;
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L_var_out = L_var1 + L_var2;
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if (((L_var1 ^ L_var2) & MIN_32) == 0)
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{
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if ((L_var_out ^ L_var1) & MIN_32)
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{
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SET_OVERFLOW(1);
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L_var_out = (L_var1 < 0) ? MIN_32 : MAX_32;
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}
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}
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return (L_var_out);
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#endif
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}
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/* ------------------------- End of L_add() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : L_sub |
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| Purpose : |
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| 32 bits subtraction of the two 32 bits variables (L_var1-L_var2) with |
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| overflow control and saturation; the result is set at +2147483647 when |
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| overflow occurs or at -2147483648 when underflow occurs. |
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| Complexity weight : 2 |
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| Inputs : |
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| L_var1 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| L_var2 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| L_var_out |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word32) L_sub (Word32 L_var1, Word32 L_var2)
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{
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#if PJ_HAS_INT64
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return L_saturate((pj_int64_t)L_var1 - L_var2);
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#else
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Word32 L_var_out;
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L_var_out = L_var1 - L_var2;
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if (((L_var1 ^ L_var2) & MIN_32) != 0)
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{
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if ((L_var_out ^ L_var1) & MIN_32)
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{
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L_var_out = (L_var1 < 0L) ? MIN_32 : MAX_32;
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SET_OVERFLOW(1);
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}
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}
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return (L_var_out);
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#endif
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}
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/* ------------------------- End of L_sub() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : L_mult |
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| Purpose : |
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| L_mult is the 32 bit result of the multiplication of var1 times var2 |
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| with one shift left i.e.: |
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| L_mult(var1,var2) = L_shl((var1 times var2),1) and |
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| L_mult(-32768,-32768) = 2147483647. |
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| Complexity weight : 1 |
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| Inputs : |
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| var1 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| var2 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| L_var_out |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word32) L_mult (Word16 var1, Word16 var2)
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{
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Word32 L_var_out;
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L_var_out = (Word32) var1 *(Word32) var2;
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if (L_var_out != (Word32) 0x40000000L)
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{
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return L_var_out << 1;
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}
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else
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{
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SET_OVERFLOW(1);
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return MAX_32;
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}
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}
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/* ------------------------- End of L_mult() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : L_mac |
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| Purpose : |
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| Multiply var1 by var2 and shift the result left by 1. Add the 32 bit |
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| result to L_var3 with saturation, return a 32 bit result: |
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| L_mac(L_var3,var1,var2) = L_add(L_var3,L_mult(var1,var2)). |
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| Complexity weight : 1 |
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| Inputs : |
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| L_var3 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| var1 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| var2 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| L_var_out |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word32) L_mac (Word32 L_var3, Word16 var1, Word16 var2)
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{
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return L_add (L_var3, L_mult (var1, var2));
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}
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/* ------------------------- End of L_mac() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : round |
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| Purpose : |
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| Round the lower 16 bits of the 32 bit input number into the MS 16 bits |
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| with saturation. Shift the resulting bits right by 16 and return the 16 |
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| bit number: |
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| round(L_var1) = extract_h(L_add(L_var1,32768)) |
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| Complexity weight : 1 |
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| Inputs : |
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| L_var1 |
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| 32 bit long signed integer (Word32 ) whose value falls in the |
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| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
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| Outputs : |
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| none |
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| Return Value : |
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| var_out |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word16) itu_round (Word32 L_var1)
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{
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return extract_h (L_add (L_var1, (Word32) 0x00008000L));
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}
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/* ------------------------- End of round() ------------------------- */
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/*___________________________________________________________________________
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| Function Name : L_shr |
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| Purpose : |
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| Arithmetically shift the 32 bit input L_var1 right var2 positions with |
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| sign extension. If var2 is negative, arithmetically shift L_var1 left |
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| by -var2 and zero fill the -var2 LSB of the result. Saturate the result |
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| in case of underflows or overflows. |
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| Complexity weight : 2 |
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| Inputs : |
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| L_var1 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
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| var2 |
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| 16 bit short signed integer (Word16) whose value falls in the |
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| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
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| Outputs : |
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| none |
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| Return Value : |
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| L_var_out |
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| 32 bit long signed integer (Word32) whose value falls in the |
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| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
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|___________________________________________________________________________|
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*/
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PJ_INLINE(Word32) L_shr_nocheck(Word32 L_var1, Word16 var2)
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{
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#if 1
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return L_var1 >> var2;
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#else
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if (var2 >= 31)
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{
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return (L_var1 < 0L) ? -1 : 0;
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}
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else
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{
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if (L_var1 < 0)
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{
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return ~((~L_var1) >> var2);
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}
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else
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{
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return L_var1 >> var2;
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}
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}
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#endif
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}
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PJ_INLINE(Word32) L_shl_nocheck (Word32 L_var1, Word16 var2)
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{
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#if PJ_HAS_INT64
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return L_saturate( ((pj_int64_t)L_var1) << var2 );
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#else
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for (; var2 > 0; var2--)
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{
|
|
if (L_var1 > (Word32) 0X3fffffffL)
|
|
{
|
|
SET_OVERFLOW(1);
|
|
return MAX_32;
|
|
}
|
|
else
|
|
{
|
|
if (L_var1 < (Word32) 0xc0000000L)
|
|
{
|
|
SET_OVERFLOW(1);
|
|
return MIN_32;
|
|
}
|
|
}
|
|
L_var1 <<= 1;
|
|
}
|
|
return (L_var1);
|
|
#endif
|
|
}
|
|
|
|
PJ_INLINE(Word32) L_shr (Word32 L_var1, Word16 var2)
|
|
{
|
|
if (var2 < 0)
|
|
{
|
|
if (var2 < -32)
|
|
var2 = -32;
|
|
return L_shl_nocheck (L_var1, (Word16) -var2);
|
|
}
|
|
else
|
|
{
|
|
return L_shr_nocheck(L_var1, var2);
|
|
}
|
|
}
|
|
/* ------------------------- End of L_shr() ------------------------- */
|
|
|
|
/*___________________________________________________________________________
|
|
| |
|
|
| Function Name : L_shl |
|
|
| |
|
|
| Purpose : |
|
|
| |
|
|
| Arithmetically shift the 32 bit input L_var1 left var2 positions. Zero |
|
|
| fill the var2 LSB of the result. If var2 is negative, arithmetically |
|
|
| shift L_var1 right by -var2 with sign extension. Saturate the result in |
|
|
| case of underflows or overflows. |
|
|
| |
|
|
| Complexity weight : 2 |
|
|
| |
|
|
| Inputs : |
|
|
| |
|
|
| L_var1 32 bit long signed integer (Word32) whose value falls in the |
|
|
| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
|
|
| |
|
|
| var2 |
|
|
| 16 bit short signed integer (Word16) whose value falls in the |
|
|
| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
|
|
| |
|
|
| Outputs : |
|
|
| |
|
|
| none |
|
|
| |
|
|
| Return Value : |
|
|
| |
|
|
| L_var_out |
|
|
| 32 bit long signed integer (Word32) whose value falls in the |
|
|
| range : 0x8000 0000 <= L_var_out <= 0x7fff ffff. |
|
|
|___________________________________________________________________________|
|
|
*/
|
|
PJ_INLINE(Word32) L_shl (Word32 L_var1, Word16 var2)
|
|
{
|
|
if (var2 <= 0)
|
|
{
|
|
if (var2 < -32)
|
|
var2 = -32;
|
|
return L_shr_nocheck(L_var1, (Word16) -var2);
|
|
}
|
|
else
|
|
{
|
|
return L_shl_nocheck(L_var1, var2);
|
|
}
|
|
}
|
|
/* ------------------------- End of L_shl() ------------------------- */
|
|
|
|
|
|
/*___________________________________________________________________________
|
|
| |
|
|
| Function Name : abs_s |
|
|
| |
|
|
| Purpose : |
|
|
| |
|
|
| Absolute value of var1; abs_s(-32768) = 32767. |
|
|
| |
|
|
| Complexity weight : 1 |
|
|
| |
|
|
| Inputs : |
|
|
| |
|
|
| var1 |
|
|
| 16 bit short signed integer (Word16) whose value falls in the |
|
|
| range : 0xffff 8000 <= var1 <= 0x0000 7fff. |
|
|
| |
|
|
| Outputs : |
|
|
| |
|
|
| none |
|
|
| |
|
|
| Return Value : |
|
|
| |
|
|
| var_out |
|
|
| 16 bit short signed integer (Word16) whose value falls in the |
|
|
| range : 0x0000 0000 <= var_out <= 0x0000 7fff. |
|
|
|___________________________________________________________________________|
|
|
*/
|
|
PJ_INLINE(Word16) abs_s (Word16 var1)
|
|
{
|
|
#if 1
|
|
if (var1 >= 0)
|
|
return var1;
|
|
else if (var1 == MIN_16)
|
|
return MAX_16;
|
|
else
|
|
return (Word16)-var1;
|
|
#else
|
|
if (var1 == MIN_16)
|
|
{
|
|
return MAX_16;
|
|
}
|
|
else
|
|
{
|
|
if (var1 < 0)
|
|
{
|
|
return (Word16)-var1;
|
|
}
|
|
else
|
|
{
|
|
return var1;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
/* ------------------------- End of abs_s() ------------------------- */
|
|
|
|
|
|
PJ_INLINE(Word16) shl_nocheck(Word16 var1, Word16 var2)
|
|
{
|
|
#if 1
|
|
/* blp: this should be more optimized */
|
|
return saturate (((Word32)var1) << var2);
|
|
#else
|
|
/* Original algorithm */
|
|
Word32 result = (Word32) var1 *((Word32) 1 << var2);
|
|
|
|
if ((var2 > 15 && var1 != 0) || (result != (Word32) ((Word16) result)))
|
|
{
|
|
SET_OVERFLOW(1);
|
|
return (Word16) ((var1 > 0) ? MAX_16 : MIN_16);
|
|
}
|
|
else
|
|
{
|
|
return extract_l (result);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
PJ_INLINE(Word16) shr_nocheck(Word16 var1, Word16 var2)
|
|
{
|
|
#if 1
|
|
/* blp: this should yield the same value */
|
|
return (Word16) (var1 >> var2);
|
|
#else
|
|
/* Original algorithm */
|
|
if (var2 >= 15)
|
|
{
|
|
return (Word16)((var1 < 0) ? -1 : 0);
|
|
}
|
|
else
|
|
{
|
|
if (var1 < 0)
|
|
{
|
|
return (Word16) (~((~var1) >> var2));
|
|
}
|
|
else
|
|
{
|
|
return (Word16)(var1 >> var2);
|
|
}
|
|
}
|
|
#endif
|
|
}
|