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