aaudio: test audio_utils::Histogram

    srcs: ["test_full_queue.cpp"],

    shared_libs: ["libaaudio"],

}

cc_test {

    name: "test_histogram",

    defaults: ["libaaudio_tests_defaults"],

    srcs: ["test_histogram.cpp"],

    shared_libs: [

        "libaudioutils",

        "libcutils",

        "libutils",

    ],

}

/*

 * Copyright 2019 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.

 */

/*

 * Test Histogram

 */

#include <iostream>

#include <gtest/gtest.h>

#include <audio_utils/Histogram.h>

using namespace android::audio_utils;

static constexpr int32_t kBinWidth = 10;

static constexpr int32_t kNumBins = 20;

TEST(test_histogram, module_sinki16) {

    Histogram histogram(kNumBins, kBinWidth);

    ASSERT_EQ(kNumBins, histogram.getNumBinsInRange());

    // Is it clear initially?

    for (int i = 0; i < kNumBins; i++) {

        ASSERT_EQ(0, histogram.getCount(i));

    }

    ASSERT_EQ(0, histogram.getCountBelowRange());

    ASSERT_EQ(0, histogram.getCountAboveRange());

    ASSERT_EQ(0, histogram.getCount());

    // Add some items.

    histogram.add(27);

    histogram.add(53);

    histogram.add(171);

    histogram.add(23);

    // Did they count correctly.

    ASSERT_EQ(2, histogram.getCount(2));          // For items 27 and 23

    ASSERT_EQ(3, histogram.getLastItemNumber(2)); // Item 23 was the 0,1,2,3th item added.

    ASSERT_EQ(1, histogram.getCount(5));          // For item 53

    ASSERT_EQ(1, histogram.getLastItemNumber(5)); // item 53 was the second item added.

    ASSERT_EQ(1, histogram.getCount(17));         // For item 171

    ASSERT_EQ(4, histogram.getCount());           // A total of four items were added.

    // Add values out of range.

    histogram.add(-5);

    ASSERT_EQ(1, histogram.getCountBelowRange()); // -5 is below zero.

    ASSERT_EQ(0, histogram.getCountAboveRange());

    ASSERT_EQ(5, histogram.getCount());

    histogram.add(200);

    ASSERT_EQ(1, histogram.getCountBelowRange());

    ASSERT_EQ(1, histogram.getCountAboveRange()); // 200 is above top bin

    ASSERT_EQ(6, histogram.getCount());

    // Try to read values out of range. Should not crash.

    // Legal index range is 0 to numBins-1

    histogram.add(-1);

    histogram.add(kNumBins);

    ASSERT_EQ(0, histogram.getCount(-1)); // edge

    ASSERT_EQ(0, histogram.getCount(kNumBins)); // edge

    ASSERT_EQ(0, histogram.getCount(-1234)); // extreme

    ASSERT_EQ(0, histogram.getCount(98765)); // extreme

    ASSERT_EQ(0, histogram.getLastItemNumber(-1));

    ASSERT_EQ(0, histogram.getLastItemNumber(kNumBins));

    // Clear all the counts.

    histogram.clear();

    // Is it clear?

    for (int i = 0; i < kNumBins; i++) {

        ASSERT_EQ(0, histogram.getCount(i));

    }

    ASSERT_EQ(0, histogram.getCountBelowRange());

    ASSERT_EQ(0, histogram.getCountAboveRange());

    ASSERT_EQ(0, histogram.getCount());

}