341 lines
8.3 KiB
C
341 lines
8.3 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vpx_rtcd.h"
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#ifdef RVL
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# define POWERPC_IDCT4X4_OPTIMS
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#endif
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/****************************************************************************
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* Notes:
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*
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* This implementation makes use of 16 bit fixed point verio of two multiply
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* constants:
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* 1. sqrt(2) * cos (pi/8)
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* 2. sqrt(2) * sin (pi/8)
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* Becuase the first constant is bigger than 1, to maintain the same 16 bit
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* fixed point precision as the second one, we use a trick of
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* x * a = x + x*(a-1)
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* so
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* x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1).
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**************************************************************************/
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static const int cospi8sqrt2minus1 = 20091;
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static const int sinpi8sqrt2 = 35468;
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#ifdef POWERPC_IDCT4X4_OPTIMS
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/*#define IDCT4X4_LOAD_TWO_PACKED_SHORTS(index0, index1) \
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asm \
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{ \
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lwzu i##index0, 4(input); \
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clrlwi i##index1, i##index0, 16; \
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srawi i##index0, i##index0, 16; \
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extsh i##index1, i##index1; \
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}; \*/
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#define IDCT4X4_PROCESS_LINE(index0, index1, index2, index3) \
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a1 = i##index0 + i##index2; \
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b1 = i##index0 - i##index2; \
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\
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temp1 = (i##index1 * sinpi8sqrt2) >> 16; \
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temp2 = i##index3 + ((i##index3 * cospi8sqrt2minus1) >> 16); \
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c1 = temp1 - temp2; \
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\
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temp1 = i##index1 + ((i##index1 * cospi8sqrt2minus1) >> 16); \
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temp2 = (i##index3 * sinpi8sqrt2) >> 16; \
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d1 = temp1 + temp2; \
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\
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i##index0 = a1 + d1; \
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i##index3 = a1 - d1; \
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\
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i##index1 = b1 + c1; \
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i##index2 = b1 - c1; \
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#define IDCT4X4_ADD_PREDICTION_AND_CLAMP(index) \
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addi i##index, i##index, 4; \
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srawi i##index, i##index, 3; \
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srwi prediction, rowPrediction, 24; \
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add. i##index, i##index, prediction; \
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slwi rowPrediction, rowPrediction, 8; \
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bge positive##index; \
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li i##index, 0; \
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positive##index: \
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cmpwi i##index, 0xff; \
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blt under255##index; \
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li i##index, 0xff; \
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under255##index: \
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slwi rowOutput, rowOutput, 8; \
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or rowOutput, rowOutput, i##index; \
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#define IDCT4X4_OUTPUT_LINE(index0, index1, index2, index3) \
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asm \
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{ \
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lwz rowPrediction, 0(pred_ptr); \
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IDCT4X4_ADD_PREDICTION_AND_CLAMP(index0); \
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IDCT4X4_ADD_PREDICTION_AND_CLAMP(index1); \
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IDCT4X4_ADD_PREDICTION_AND_CLAMP(index2); \
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IDCT4X4_ADD_PREDICTION_AND_CLAMP(index3); \
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stw rowOutput, 0(dst_ptr); \
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}; \
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dst_ptr += dst_stride; \
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pred_ptr += pred_stride; \
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void vp8_short_idct4x4llm_c(register short *input, register unsigned char *pred_ptr,
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register int pred_stride, register unsigned char *dst_ptr,
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register int dst_stride)
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{
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register int a1, b1, c1, d1;
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register int temp1, temp2;
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register i0, i1, i2, i3;
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register i4, i5, i6, i7;
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register i8, i9, i10, i11;
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register i12, i13, i14, i15;
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register rowPrediction, prediction;
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register rowOutput;
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// this one is not faster, but may be improved to become so
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/*input -= 2;
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(0, 1);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(2, 3);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(4, 5);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(6, 7);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(8, 9);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(10, 11);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(12, 13);
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IDCT4X4_LOAD_TWO_PACKED_SHORTS(14, 15);*/
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i0 = input[0];
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i1 = input[1];
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i2 = input[2];
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i3 = input[3];
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i4 = input[4];
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i5 = input[5];
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i6 = input[6];
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i7 = input[7];
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i8 = input[8];
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i9 = input[9];
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i10 = input[10];
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i11 = input[11];
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i12 = input[12];
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i13 = input[13];
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i14 = input[14];
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i15 = input[15];
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// columns
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IDCT4X4_PROCESS_LINE(0, 4, 8, 12);
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IDCT4X4_PROCESS_LINE(1, 5, 9, 13);
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IDCT4X4_PROCESS_LINE(2, 6, 10, 14);
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IDCT4X4_PROCESS_LINE(3, 7, 11, 15);
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// rows
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IDCT4X4_PROCESS_LINE(0, 1, 2, 3);
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IDCT4X4_OUTPUT_LINE (0, 1, 2, 3);
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IDCT4X4_PROCESS_LINE(4, 5, 6, 7);
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IDCT4X4_OUTPUT_LINE (4, 5, 6, 7);
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IDCT4X4_PROCESS_LINE(8, 9, 10, 11);
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IDCT4X4_OUTPUT_LINE (8, 9, 10, 11);
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IDCT4X4_PROCESS_LINE(12, 13, 14, 15);
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IDCT4X4_OUTPUT_LINE (12, 13, 14, 15);
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}
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#else // POWERPC_IDCT4X4_OPTIMS
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void vp8_short_idct4x4llm_c(short *input, unsigned char *pred_ptr,
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int pred_stride, unsigned char *dst_ptr,
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int dst_stride)
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{
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int i;
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int r, c;
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int a1, b1, c1, d1;
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short output[16];
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short *ip = input;
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short *op = output;
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int temp1, temp2;
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int shortpitch = 4;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[8];
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b1 = ip[0] - ip[8];
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temp1 = (ip[4] * sinpi8sqrt2) >> 16;
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temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16);
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c1 = temp1 - temp2;
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temp1 = ip[4] + ((ip[4] * cospi8sqrt2minus1) >> 16);
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temp2 = (ip[12] * sinpi8sqrt2) >> 16;
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d1 = temp1 + temp2;
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op[shortpitch*0] = a1 + d1;
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op[shortpitch*3] = a1 - d1;
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op[shortpitch*1] = b1 + c1;
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op[shortpitch*2] = b1 - c1;
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ip++;
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op++;
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}
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ip = output;
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op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[2];
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b1 = ip[0] - ip[2];
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temp1 = (ip[1] * sinpi8sqrt2) >> 16;
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temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1) >> 16);
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c1 = temp1 - temp2;
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temp1 = ip[1] + ((ip[1] * cospi8sqrt2minus1) >> 16);
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temp2 = (ip[3] * sinpi8sqrt2) >> 16;
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d1 = temp1 + temp2;
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op[0] = (a1 + d1 + 4) >> 3;
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op[3] = (a1 - d1 + 4) >> 3;
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op[1] = (b1 + c1 + 4) >> 3;
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op[2] = (b1 - c1 + 4) >> 3;
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ip += shortpitch;
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op += shortpitch;
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}
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ip = output;
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for (r = 0; r < 4; r++)
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{
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for (c = 0; c < 4; c++)
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{
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int a = ip[c] + pred_ptr[c] ;
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if (a < 0)
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a = 0;
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if (a > 255)
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a = 255;
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dst_ptr[c] = (unsigned char) a ;
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}
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ip += 4;
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dst_ptr += dst_stride;
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pred_ptr += pred_stride;
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}
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}
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#endif // POWERPC_IDCT4X4_OPTIMS
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void vp8_dc_only_idct_add_c(short input_dc, unsigned char *pred_ptr,
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int pred_stride, unsigned char *dst_ptr,
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int dst_stride)
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{
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int a1 = ((input_dc + 4) >> 3);
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int r, c;
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for (r = 0; r < 4; r++)
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{
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for (c = 0; c < 4; c++)
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{
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int a = a1 + pred_ptr[c] ;
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if (a < 0)
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a = 0;
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if (a > 255)
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a = 255;
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dst_ptr[c] = (unsigned char) a ;
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}
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dst_ptr += dst_stride;
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pred_ptr += pred_stride;
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}
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}
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void vp8_short_inv_walsh4x4_c(short *input, short *mb_dqcoeff)
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{
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short output[16];
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int i;
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int a1, b1, c1, d1;
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int a2, b2, c2, d2;
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short *ip = input;
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short *op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[12];
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b1 = ip[4] + ip[8];
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c1 = ip[4] - ip[8];
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d1 = ip[0] - ip[12];
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op[0] = a1 + b1;
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op[4] = c1 + d1;
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op[8] = a1 - b1;
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op[12] = d1 - c1;
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ip++;
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op++;
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}
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ip = output;
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op = output;
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for (i = 0; i < 4; i++)
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{
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a1 = ip[0] + ip[3];
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b1 = ip[1] + ip[2];
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c1 = ip[1] - ip[2];
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d1 = ip[0] - ip[3];
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a2 = a1 + b1;
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b2 = c1 + d1;
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c2 = a1 - b1;
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d2 = d1 - c1;
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op[0] = (a2 + 3) >> 3;
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op[1] = (b2 + 3) >> 3;
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op[2] = (c2 + 3) >> 3;
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op[3] = (d2 + 3) >> 3;
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ip += 4;
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op += 4;
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}
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for(i = 0; i < 16; i++)
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{
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mb_dqcoeff[i * 16] = output[i];
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}
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}
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void vp8_short_inv_walsh4x4_1_c(short *input, short *mb_dqcoeff)
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{
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int i;
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int a1;
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a1 = ((input[0] + 3) >> 3);
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for(i = 0; i < 16; i++)
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{
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mb_dqcoeff[i * 16] = a1;
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}
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}
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void vp8_idct_dequant_0_1x_c(short* q, short* dq, unsigned char* dst, int dst_stride)
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{
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vp8_dc_only_idct_add(q[0]*dq[0], dst, dst_stride, dst, dst_stride);
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q[0] = 0;
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}
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