ref: 9fdfb8e92823abadc54d825d0603a7e9fd344520
dir: /vp8/encoder/arm/quantize_arm.c/
/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <math.h>
#include "vpx_mem/vpx_mem.h"
#include "quantize.h"
#include "entropy.h"
#include "predictdc.h"
DECLARE_ALIGNED(16, const short, vp8_rvsplus1_default_zig_zag1d[16]) =
{
1, 2, 6, 7,
3, 5, 8, 13,
4, 9, 12, 14,
10, 11, 15, 16,
};
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);
void vp8_fast_quantize_b_neon(BLOCK *b, BLOCKD *d)
{
d->eob = vp8_fast_quantize_b_neon_func(b->coeff, &b->zbin[0][0], d->qcoeff, d->dqcoeff, d->dequant[0], vp8_rvsplus1_default_zig_zag1d, &b->round[0][0], &b->quant[0][0]);
}
/*
//neon code is written according to the following rewritten c code
void vp8_fast_quantize_b_neon(BLOCK *b,BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, x1, y, z, sz;
short *coeff_ptr = &b->Coeff[0];
short *zbin_ptr = &b->Zbin[0][0];
short *round_ptr = &b->Round[0][0];
short *quant_ptr = &b->Quant[0][0];
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr= d->dqcoeff;
short *dequant_ptr= &d->Dequant[0][0];
eob = 0;
for(i=0;i<16;i++)
{
z = coeff_ptr[i];
zbin = zbin_ptr[i] ;
x = abs(z); // x = abs(z)
if(x>=zbin)
{
sz = (z>>31); // sign of z
y = ((x+round_ptr[i])*quant_ptr[i])>>16; // quantize (x)
x1 = (y^sz) - sz; // get the sign back
qcoeff_ptr[i] = x1; // write to destination
dqcoeff_ptr[i] = x1 * dequant_ptr[i]; // dequantized value
if(y)
{
if(eob<vp8_rvsplus1_default_zig_zag1d[i])
eob=(int)vp8_rvsplus1_default_zig_zag1d[i]; // last nonzero coeffs
}
}else
{
qcoeff_ptr[i] = 0; // write to destination
dqcoeff_ptr[i] = 0; // dequantized value
}
}
d->eob = eob;
}
*/