520389e3
 xiaoyu
接入cocos源码，编译未通过，继续修改
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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cmath>
#include "audio/android/audio_utils/include/audio_utils/minifloat.h"
#define EXPONENT_BITS 3
#define EXPONENT_MAX ((1 << EXPONENT_BITS) - 1)
#define EXCESS ((1 << EXPONENT_BITS) - 2)
#define MANTISSA_BITS 13
#define MANTISSA_MAX ((1 << MANTISSA_BITS) - 1)
#define HIDDEN_BIT (1 << MANTISSA_BITS)
#define ONE_FLOAT ((float) (1 << (MANTISSA_BITS + 1)))
#define MINIFLOAT_MAX ((EXPONENT_MAX << MANTISSA_BITS) | MANTISSA_MAX)
#if EXPONENT_BITS + MANTISSA_BITS != 16
#error EXPONENT_BITS and MANTISSA_BITS must sum to 16
#endif
extern "C" {
gain_minifloat_t gain_from_float(float v)
{
if (std::isnan(v) || v <= 0.0f)
{
return 0;
}
if (v >= 2.0f)
{
return MINIFLOAT_MAX;
}
int exp;
float r = frexpf(v, &exp);
if ((exp += EXCESS) > EXPONENT_MAX)
{
return MINIFLOAT_MAX;
}
if (-exp >= MANTISSA_BITS)
{
return 0;
}
int mantissa = (int) (r * ONE_FLOAT);
return exp > 0 ? (exp << MANTISSA_BITS) | (mantissa & ~HIDDEN_BIT) :
(mantissa >> (1 - exp)) & MANTISSA_MAX;
}
float float_from_gain(gain_minifloat_t a)
{
int mantissa = a & MANTISSA_MAX;
int exponent = (a >> MANTISSA_BITS) & EXPONENT_MAX;
return ldexpf((exponent > 0 ? HIDDEN_BIT | mantissa : mantissa << 1) / ONE_FLOAT,
exponent - EXCESS);
}
} // extern "C" {
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