dequantize.c 2.47 KiB
/*
 *  Copyright (c) 2010 The WebM 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 "vpx_ports/config.h"
#include "dequantize.h"
#include "vp8/common/idct.h"
#include "vpx_mem/vpx_mem.h"
extern void vp8_short_idct4x4llm_c(short *input, short *output, int pitch) ;
extern void vp8_short_idct4x4llm_1_c(short *input, short *output, int pitch);
void vp8_dequantize_b_c(BLOCKD *d)
    int i;
    short *DQ  = d->dqcoeff;
    short *Q   = d->qcoeff;
    short *DQC = d->dequant;
    for (i = 0; i < 16; i++)
        DQ[i] = Q[i] * DQC[i];
void vp8_dequant_idct_add_c(short *input, short *dq, unsigned char *pred,
                            unsigned char *dest, int pitch, int stride)
    short output[16];
    short *diff_ptr = output;
    int r, c;
    int i;
    for (i = 0; i < 16; i++)
        input[i] = dq[i] * input[i];
    /* the idct halves ( >> 1) the pitch */
    vp8_short_idct4x4llm_c(input, output, 4 << 1);
    vpx_memset(input, 0, 32);
    for (r = 0; r < 4; r++)
        for (c = 0; c < 4; c++)
            int a = diff_ptr[c] + pred[c];
            if (a < 0)
                a = 0;
            if (a > 255)
                a = 255;
            dest[c] = (unsigned char) a;
        dest += stride;
        diff_ptr += 4;
        pred += pitch;
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} void vp8_dequant_dc_idct_add_c(short *input, short *dq, unsigned char *pred, unsigned char *dest, int pitch, int stride, int Dc) { int i; short output[16]; short *diff_ptr = output; int r, c; input[0] = (short)Dc; for (i = 1; i < 16; i++) { input[i] = dq[i] * input[i]; } /* the idct halves ( >> 1) the pitch */ vp8_short_idct4x4llm_c(input, output, 4 << 1); vpx_memset(input, 0, 32); for (r = 0; r < 4; r++) { for (c = 0; c < 4; c++) { int a = diff_ptr[c] + pred[c]; if (a < 0) a = 0; if (a > 255) a = 255; dest[c] = (unsigned char) a; } dest += stride; diff_ptr += 4; pred += pitch; } }