1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 #include <math.h> 13 #include "vpx_mem/vpx_mem.h" 14 15 #include "vp8/encoder/quantize.h" 16 #include "vp8/common/entropy.h" 17 18 DECLARE_ALIGNED(16, const short, vp8_rvsplus1_default_zig_zag1d[16]) = 19 { 20 1, 2, 6, 7, 21 3, 5, 8, 13, 22 4, 9, 12, 14, 23 10, 11, 15, 16, 24 }; 25 26 27 extern int vp8_fast_quantize_b_neon_func(short *coeff_ptr, short *zbin_ptr, short *qcoeff_ptr, short *dqcoeff_ptr, short *dequant_ptr, const short *scan_mask, short *round_ptr, short *quant_ptr); 28 29 void vp8_fast_quantize_b_neon(BLOCK *b, BLOCKD *d) 30 { 31 d->eob = vp8_fast_quantize_b_neon_func(b->coeff, b->zbin, d->qcoeff, d->dqcoeff, d->dequant, vp8_rvsplus1_default_zig_zag1d, b->round, b->quant_fast); 32 } 33 34 /* 35 //neon code is written according to the following rewritten c code 36 void vp8_fast_quantize_b_neon(BLOCK *b,BLOCKD *d) 37 { 38 int i, rc, eob; 39 int zbin; 40 int x, x1, y, z, sz; 41 short *coeff_ptr = &b->Coeff[0]; 42 short *zbin_ptr = &b->Zbin[0][0]; 43 short *round_ptr = &b->Round[0][0]; 44 short *quant_ptr = &b->Quant[0][0]; 45 short *qcoeff_ptr = d->qcoeff; 46 short *dqcoeff_ptr= d->dqcoeff; 47 short *dequant_ptr= &d->Dequant[0][0]; 48 49 eob = 0; 50 51 for(i=0;i<16;i++) 52 { 53 z = coeff_ptr[i]; 54 zbin = zbin_ptr[i] ; 55 x = abs(z); // x = abs(z) 56 57 if(x>=zbin) 58 { 59 sz = (z>>31); // sign of z 60 y = ((x+round_ptr[i])*quant_ptr[i])>>16; // quantize (x) 61 x1 = (y^sz) - sz; // get the sign back 62 63 qcoeff_ptr[i] = x1; // write to destination 64 dqcoeff_ptr[i] = x1 * dequant_ptr[i]; // dequantized value 65 66 if(y) 67 { 68 if(eob<vp8_rvsplus1_default_zig_zag1d[i]) 69 eob=(int)vp8_rvsplus1_default_zig_zag1d[i]; // last nonzero coeffs 70 } 71 }else 72 { 73 qcoeff_ptr[i] = 0; // write to destination 74 dqcoeff_ptr[i] = 0; // dequantized value 75 } 76 } 77 d->eob = eob; 78 } 79 */ 80
