| /****************************************************************************** |
| * |
| * Copyright 1999-2012 Broadcom Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * source file for fast dct operations |
| * |
| ******************************************************************************/ |
| |
| #include "sbc_dct.h" |
| #include "sbc_enc_func_declare.h" |
| #include "sbc_encoder.h" |
| |
| /******************************************************************************* |
| * |
| * Function SBC_FastIDCT8 |
| * |
| * Description implementation of fast DCT algorithm by Feig and Winograd |
| * |
| * |
| * Returns y = dct(pInVect) |
| * |
| * |
| ******************************************************************************/ |
| |
| #if (SBC_IS_64_MULT_IN_IDCT == FALSE) |
| #define SBC_COS_PI_SUR_4 \ |
| (0x00005a82) /* ((0x8000) * 0.7071) = cos(pi/4) \ |
| */ |
| #define SBC_COS_PI_SUR_8 \ |
| (0x00007641) /* ((0x8000) * 0.9239) = (cos(pi/8)) */ |
| #define SBC_COS_3PI_SUR_8 \ |
| (0x000030fb) /* ((0x8000) * 0.3827) = (cos(3*pi/8)) */ |
| #define SBC_COS_PI_SUR_16 \ |
| (0x00007d8a) /* ((0x8000) * 0.9808)) = (cos(pi/16)) */ |
| #define SBC_COS_3PI_SUR_16 \ |
| (0x00006a6d) /* ((0x8000) * 0.8315)) = (cos(3*pi/16)) */ |
| #define SBC_COS_5PI_SUR_16 \ |
| (0x0000471c) /* ((0x8000) * 0.5556)) = (cos(5*pi/16)) */ |
| #define SBC_COS_7PI_SUR_16 \ |
| (0x000018f8) /* ((0x8000) * 0.1951)) = (cos(7*pi/16)) */ |
| #define SBC_IDCT_MULT(a, b, c) SBC_MULT_32_16_SIMPLIFIED(a, b, c) |
| #else |
| #define SBC_COS_PI_SUR_4 \ |
| (0x5A827999) /* ((0x80000000) * 0.707106781) = (cos(pi/4) ) */ |
| #define SBC_COS_PI_SUR_8 \ |
| (0x7641AF3C) /* ((0x80000000) * 0.923879533) = (cos(pi/8) ) */ |
| #define SBC_COS_3PI_SUR_8 \ |
| (0x30FBC54D) /* ((0x80000000) * 0.382683432) = (cos(3*pi/8) ) */ |
| #define SBC_COS_PI_SUR_16 \ |
| (0x7D8A5F3F) /* ((0x80000000) * 0.98078528 )) = (cos(pi/16) ) */ |
| #define SBC_COS_3PI_SUR_16 \ |
| (0x6A6D98A4) /* ((0x80000000) * 0.831469612)) = (cos(3*pi/16)) */ |
| #define SBC_COS_5PI_SUR_16 \ |
| (0x471CECE6) /* ((0x80000000) * 0.555570233)) = (cos(5*pi/16)) */ |
| #define SBC_COS_7PI_SUR_16 \ |
| (0x18F8B83C) /* ((0x80000000) * 0.195090322)) = (cos(7*pi/16)) */ |
| #define SBC_IDCT_MULT(a, b, c) SBC_MULT_32_32(a, b, c) |
| #endif /* SBC_IS_64_MULT_IN_IDCT */ |
| |
| #if (SBC_FAST_DCT == FALSE) |
| extern const int16_t gas16AnalDCTcoeff8[]; |
| extern const int16_t gas16AnalDCTcoeff4[]; |
| #endif |
| |
| void SBC_FastIDCT8(int32_t* pInVect, int32_t* pOutVect) { |
| #if (SBC_FAST_DCT == TRUE) |
| #if (SBC_ARM_ASM_OPT == TRUE) |
| #else |
| #if (SBC_IPAQ_OPT == TRUE) |
| #if (SBC_IS_64_MULT_IN_IDCT == TRUE) |
| int64_t s64Temp; |
| #endif |
| #else |
| #if (SBC_IS_64_MULT_IN_IDCT == TRUE) |
| int32_t s32HiTemp; |
| #else |
| int32_t s32In2Temp; |
| register int32_t s32In1Temp; |
| #endif |
| #endif |
| #endif |
| |
| register int32_t x0, x1, x2, x3, x4, x5, x6, x7, temp; |
| int32_t res_even[4], res_odd[4]; |
| /*x0= (pInVect[4])/2 ;*/ |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, pInVect[4], x0); |
| /*printf("x0 0x%x = %d = %d * %d\n", x0, x0, SBC_COS_PI_SUR_4, pInVect[4]);*/ |
| |
| x1 = (pInVect[3] + pInVect[5]) >> 1; |
| x2 = (pInVect[2] + pInVect[6]) >> 1; |
| x3 = (pInVect[1] + pInVect[7]) >> 1; |
| x4 = (pInVect[0] + pInVect[8]) >> 1; |
| x5 = (pInVect[9] - pInVect[15]) >> 1; |
| x6 = (pInVect[10] - pInVect[14]) >> 1; |
| x7 = (pInVect[11] - pInVect[13]) >> 1; |
| |
| /* 2-point IDCT of x0 and x4 as in (11) */ |
| temp = x0; |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, (x0 + x4), |
| x0); /*x0 = ( x0 + x4 ) * cos(1*pi/4) ; */ |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, (temp - x4), |
| x4); /*x4 = ( temp - x4 ) * cos(1*pi/4) ; */ |
| |
| /* rearrangement of x2 and x6 as in (15) */ |
| x2 -= x6; |
| x6 <<= 1; |
| |
| /* 2-point IDCT of x2 and x6 and post-multiplication as in (15) */ |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, x6, x6); /*x6 = x6 * cos(1*pi/4) ; */ |
| temp = x2; |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_8, (x2 + x6), |
| x2); /*x2 = ( x2 + x6 ) * cos(1*pi/8) ; */ |
| SBC_IDCT_MULT(SBC_COS_3PI_SUR_8, (temp - x6), |
| x6); /*x6 = ( temp - x6 ) * cos(3*pi/8) ;*/ |
| |
| /* 4-point IDCT of x0,x2,x4 and x6 as in (11) */ |
| res_even[0] = x0 + x2; |
| res_even[1] = x4 + x6; |
| res_even[2] = x4 - x6; |
| res_even[3] = x0 - x2; |
| |
| /* rearrangement of x1,x3,x5,x7 as in (15) */ |
| x7 <<= 1; |
| x5 = (x5 << 1) - x7; |
| x3 = (x3 << 1) - x5; |
| x1 -= x3 >> 1; |
| |
| /* two-dimensional IDCT of x1 and x5 */ |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, x5, x5); /*x5 = x5 * cos(1*pi/4) ; */ |
| temp = x1; |
| x1 = x1 + x5; |
| x5 = temp - x5; |
| |
| /* rearrangement of x3 and x7 as in (15) */ |
| x3 -= x7; |
| x7 <<= 1; |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_4, x7, x7); /*x7 = x7 * cos(1*pi/4) ; */ |
| |
| /* 2-point IDCT of x3 and x7 and post-multiplication as in (15) */ |
| temp = x3; |
| SBC_IDCT_MULT(SBC_COS_PI_SUR_8, (x3 + x7), |
| x3); /*x3 = ( x3 + x7 ) * cos(1*pi/8) ; */ |
| SBC_IDCT_MULT(SBC_COS_3PI_SUR_8, (temp - x7), |
| x7); /*x7 = ( temp - x7 ) * cos(3*pi/8) ;*/ |
| |
| /* 4-point IDCT of x1,x3,x5 and x7 and post multiplication by diagonal matrix |
| * as in (14) */ |
| SBC_IDCT_MULT((SBC_COS_PI_SUR_16), (x1 + x3), |
| res_odd[0]); /*res_odd[ 0 ] = ( x1 + x3 ) * cos(1*pi/16) ; */ |
| SBC_IDCT_MULT((SBC_COS_3PI_SUR_16), (x5 + x7), |
| res_odd[1]); /*res_odd[ 1 ] = ( x5 + x7 ) * cos(3*pi/16) ; */ |
| SBC_IDCT_MULT((SBC_COS_5PI_SUR_16), (x5 - x7), |
| res_odd[2]); /*res_odd[ 2 ] = ( x5 - x7 ) * cos(5*pi/16) ; */ |
| SBC_IDCT_MULT((SBC_COS_7PI_SUR_16), (x1 - x3), |
| res_odd[3]); /*res_odd[ 3 ] = ( x1 - x3 ) * cos(7*pi/16) ; */ |
| |
| /* additions and subtractions as in (9) */ |
| pOutVect[0] = (res_even[0] + res_odd[0]); |
| pOutVect[1] = (res_even[1] + res_odd[1]); |
| pOutVect[2] = (res_even[2] + res_odd[2]); |
| pOutVect[3] = (res_even[3] + res_odd[3]); |
| pOutVect[7] = (res_even[0] - res_odd[0]); |
| pOutVect[6] = (res_even[1] - res_odd[1]); |
| pOutVect[5] = (res_even[2] - res_odd[2]); |
| pOutVect[4] = (res_even[3] - res_odd[3]); |
| #else |
| uint8_t Index, k; |
| int32_t temp; |
| /*Calculate 4 subband samples by matrixing*/ |
| for (Index = 0; Index < 8; Index++) { |
| temp = 0; |
| for (k = 0; k < 16; k++) { |
| /*temp += (int32_t)(((int64_t)M[(Index*strEncParams->numOfSubBands*2)+k] * |
| * Y[k]) >> 16 );*/ |
| temp += (gas16AnalDCTcoeff8[(Index * 8 * 2) + k] * (pInVect[k] >> 16)); |
| temp += |
| ((gas16AnalDCTcoeff8[(Index * 8 * 2) + k] * (pInVect[k] & 0xFFFF)) >> |
| 16); |
| } |
| pOutVect[Index] = temp; |
| } |
| #endif |
| /* printf("pOutVect: 0x%x;0x%x;0x%x;0x%x;0x%x;0x%x;0x%x;0x%x\n",\ |
| pOutVect[0],pOutVect[1],pOutVect[2],pOutVect[3],pOutVect[4],pOutVect[5],pOutVect[6],pOutVect[7]);*/ |
| } |
| |
| /******************************************************************************* |
| * |
| * Function SBC_FastIDCT4 |
| * |
| * Description implementation of fast DCT algorithm by Feig and Winograd |
| * |
| * |
| * Returns y = dct(x0) |
| * |
| * |
| ******************************************************************************/ |
| void SBC_FastIDCT4(int32_t* pInVect, int32_t* pOutVect) { |
| #if (SBC_FAST_DCT == TRUE) |
| #if (SBC_ARM_ASM_OPT == TRUE) |
| #else |
| #if (SBC_IPAQ_OPT == TRUE) |
| #if (SBC_IS_64_MULT_IN_IDCT == TRUE) |
| int64_t s64Temp; |
| #endif |
| #else |
| #if (SBC_IS_64_MULT_IN_IDCT == TRUE) |
| int32_t s32HiTemp; |
| #else |
| uint16_t s32In2Temp; |
| int32_t s32In1Temp; |
| #endif |
| #endif |
| #endif |
| int32_t temp, x2; |
| int32_t tmp[8]; |
| |
| x2 = pInVect[2] >> 1; |
| temp = (pInVect[0] + pInVect[4]); |
| SBC_IDCT_MULT((SBC_COS_PI_SUR_4 >> 1), temp, tmp[0]); |
| tmp[1] = x2 - tmp[0]; |
| tmp[0] += x2; |
| temp = (pInVect[1] + pInVect[3]); |
| SBC_IDCT_MULT((SBC_COS_3PI_SUR_8 >> 1), temp, tmp[3]); |
| SBC_IDCT_MULT((SBC_COS_PI_SUR_8 >> 1), temp, tmp[2]); |
| temp = (pInVect[5] - pInVect[7]); |
| SBC_IDCT_MULT((SBC_COS_3PI_SUR_8 >> 1), temp, tmp[5]); |
| SBC_IDCT_MULT((SBC_COS_PI_SUR_8 >> 1), temp, tmp[4]); |
| tmp[6] = tmp[2] + tmp[5]; |
| tmp[7] = tmp[3] - tmp[4]; |
| pOutVect[0] = (tmp[0] + tmp[6]); |
| pOutVect[1] = (tmp[1] + tmp[7]); |
| pOutVect[2] = (tmp[1] - tmp[7]); |
| pOutVect[3] = (tmp[0] - tmp[6]); |
| #else |
| uint8_t Index, k; |
| int32_t temp; |
| /*Calculate 4 subband samples by matrixing*/ |
| for (Index = 0; Index < 4; Index++) { |
| temp = 0; |
| for (k = 0; k < 8; k++) { |
| /*temp += (int32_t)(((int64_t)M[(Index*strEncParams->numOfSubBands*2)+k] * |
| * Y[k]) >> 16 ); */ |
| temp += (gas16AnalDCTcoeff4[(Index * 4 * 2) + k] * (pInVect[k] >> 16)); |
| temp += |
| ((gas16AnalDCTcoeff4[(Index * 4 * 2) + k] * (pInVect[k] & 0xFFFF)) >> |
| 16); |
| } |
| pOutVect[Index] = temp; |
| } |
| #endif |
| } |