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81 lines
2.7 KiB
81 lines
2.7 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <array>
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#include <climits>
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#include <math.h>
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#include <audio_utils/sample.h>
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#include <gtest/gtest.h>
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static_assert(sizeof(sample_minifloat_t) == sizeof(uint16_t),
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"sizeof(sample_minifloat_t != sizeof(uint16_t");
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static constexpr int signum(float f)
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{
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return (f > 0) - (f < 0);
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}
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TEST(audio_utils_sample, Convert)
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{
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std::vector<float> fvec;
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// verify minifloat <-> float is a bijection, and monotonic as float
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for (int i = 0; i <= 0xFFFF; i++) {
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// construct floats in order
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const int val = i < 0x8000 ? 0xFFFF - i : i ^ 0x8000;
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// TODO shouldn't depend on representation in order to skip negative zero
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if (val == 0x8000) {
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// This is an undefined value and so we won't test its behavior
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continue;
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}
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// TODO reinterpret_cast<sample_minifloat_t>(val) fails
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const sample_minifloat_t in = (sample_minifloat_t) val;
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const float f = float_from_sample(in);
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const sample_minifloat_t out = sample_from_float(f);
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ASSERT_EQ(in, out);
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fvec.push_back(f);
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}
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// no longer needed since we construct floats in order
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// #include <algorithm>
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// std::sort(fvec.begin(), fvec.end());
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float prev = -2.0f;
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for (auto curr : fvec) {
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// LT instead of LE because no negative zero
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ASSERT_LT(prev, curr);
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int signum_prev = signum(prev);
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int signum_curr = signum(curr);
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ASSERT_LE(signum_prev, signum_curr);
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if (signum_prev == signum_curr) {
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// confirm ratio between adjacent values (3:45 of "Will it float?" video)
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float ratio = curr / prev;
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float lower, upper;
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// normal
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if (fabsf(curr) >= 0.001f) {
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upper = 1.005f;
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lower = 0.995f;
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// denormal
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} else {
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upper = 2.0f;
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lower = 0.5f;
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}
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ASSERT_GE(ratio, lower) << "prev " << prev << " curr " << curr;
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ASSERT_LE(ratio, upper) << "prev " << prev << " curr " << curr;
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}
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prev = curr;
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}
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ASSERT_LT(prev, 2.0f);
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}
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