95 lines
1.9 KiB
C
95 lines
1.9 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 "vp9/common/vp9_quant_common.h"
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static int dc_qlookup[QINDEX_RANGE];
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static int ac_qlookup[QINDEX_RANGE];
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#define ACDC_MIN 4
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void vp9_init_quant_tables() {
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int i;
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int current_val = 4;
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int last_val = 4;
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int ac_val;
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for (i = 0; i < QINDEX_RANGE; i++) {
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ac_qlookup[i] = current_val;
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current_val = (int)((double)current_val * 1.02);
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if (current_val == last_val)
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current_val++;
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last_val = current_val;
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ac_val = ac_qlookup[i];
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dc_qlookup[i] = (int)((0.000000305 * ac_val * ac_val * ac_val) +
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(-0.00065 * ac_val * ac_val) +
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(0.9 * ac_val) + 0.5);
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if (dc_qlookup[i] < ACDC_MIN)
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dc_qlookup[i] = ACDC_MIN;
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}
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}
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int vp9_dc_quant(int QIndex, int Delta) {
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int retval;
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QIndex = QIndex + Delta;
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if (QIndex > MAXQ)
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QIndex = MAXQ;
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else if (QIndex < 0)
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QIndex = 0;
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retval = dc_qlookup[ QIndex ];
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return retval;
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}
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int vp9_dc_uv_quant(int QIndex, int Delta) {
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int retval;
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QIndex = QIndex + Delta;
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if (QIndex > MAXQ)
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QIndex = MAXQ;
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else if (QIndex < 0)
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QIndex = 0;
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retval = dc_qlookup[ QIndex ];
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return retval;
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}
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int vp9_ac_yquant(int QIndex) {
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int retval;
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if (QIndex > MAXQ)
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QIndex = MAXQ;
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else if (QIndex < 0)
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QIndex = 0;
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retval = ac_qlookup[ QIndex ];
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return retval;
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}
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int vp9_ac_uv_quant(int QIndex, int Delta) {
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int retval;
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QIndex = QIndex + Delta;
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if (QIndex > MAXQ)
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QIndex = MAXQ;
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else if (QIndex < 0)
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QIndex = 0;
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retval = ac_qlookup[ QIndex ];
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return retval;
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}
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