aaudio: unit test for IsochronousClockModel

    ],

}

cc_test {

    name: "test_clock_model",

    defaults: ["libaaudio_tests_defaults"],

    srcs: ["test_clock_model.cpp"],

    shared_libs: [

        "libaaudio",

        "libaudioutils",

        "libcutils",

        "libutils",

    ],

}

cc_test {

    name: "test_block_adapter",

    defaults: ["libaaudio_tests_defaults"],

/*

 * Copyright (C) 2018 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.

 */

// Unit tests for Isochronous Clock Model

#include <math.h>

#include <stdlib.h>

#include <aaudio/AAudio.h>

#include <audio_utils/clock.h>

#include <client/IsochronousClockModel.h>

#include <gtest/gtest.h>

using namespace aaudio;

// We can use arbitrary values here because we are not opening a real audio stream.

#define SAMPLE_RATE             48000

#define HW_FRAMES_PER_BURST     48

#define NANOS_PER_BURST         (NANOS_PER_SECOND * HW_FRAMES_PER_BURST / SAMPLE_RATE)

class ClockModelTestFixture: public ::testing::Test {

public:

    ClockModelTestFixture() {

    }

    void SetUp() {

        model.setSampleRate(SAMPLE_RATE);

        model.setFramesPerBurst(HW_FRAMES_PER_BURST);

    }

    void TearDown() {

    }

    ~ClockModelTestFixture()  {

        // cleanup any pending stuff, but no exceptions allowed

    }

    IsochronousClockModel model;

};

// Check default setup.

TEST_F(ClockModelTestFixture, clock_setup) {

    ASSERT_EQ(SAMPLE_RATE, model.getSampleRate());

    ASSERT_EQ(HW_FRAMES_PER_BURST, model.getFramesPerBurst());

}

// Test delta calculations.

TEST_F(ClockModelTestFixture, clock_deltas) {

    int64_t position = model.convertDeltaTimeToPosition(NANOS_PER_SECOND);

    ASSERT_EQ(SAMPLE_RATE, position);

    // Deltas are not quantized.

    // Compare time to the equivalent position in frames.

    constexpr int64_t kNanosPerBurst = HW_FRAMES_PER_BURST * NANOS_PER_SECOND / SAMPLE_RATE;

    position = model.convertDeltaTimeToPosition(NANOS_PER_SECOND + (kNanosPerBurst / 2));

    ASSERT_EQ(SAMPLE_RATE + (HW_FRAMES_PER_BURST / 2), position);

    int64_t time = model.convertDeltaPositionToTime(SAMPLE_RATE);

    ASSERT_EQ(NANOS_PER_SECOND, time);

    // Compare position in frames to the equivalent time.

    time = model.convertDeltaPositionToTime(SAMPLE_RATE + (HW_FRAMES_PER_BURST / 2));

    ASSERT_EQ(NANOS_PER_SECOND + (kNanosPerBurst / 2), time);

}

// start() should force the internal markers

TEST_F(ClockModelTestFixture, clock_start) {

    const int64_t startTime = 100000;

    model.start(startTime);

    int64_t position = model.convertTimeToPosition(startTime);

    EXPECT_EQ(0, position);

    int64_t time = model.convertPositionToTime(position);

    EXPECT_EQ(startTime, time);

    time = startTime + (500 * NANOS_PER_MICROSECOND);

    position = model.convertTimeToPosition(time);

    EXPECT_EQ(0, position);

}

// timestamps moves the window if outside the bounds

// TODO test nudging the window

TEST_F(ClockModelTestFixture, clock_timestamp) {

    const int64_t startTime = 100000000;

    model.start(startTime);

    const int64_t position = HW_FRAMES_PER_BURST; // hardware

    int64_t markerTime = startTime + NANOS_PER_MILLISECOND + (200 * NANOS_PER_MICROSECOND);

    // Should set marker.

    model.processTimestamp(position, markerTime);

    EXPECT_EQ(position, model.convertTimeToPosition(markerTime));

    // convertTimeToPosition rounds down

    EXPECT_EQ(position, model.convertTimeToPosition(markerTime + (73 * NANOS_PER_MICROSECOND)));

    // convertPositionToTime rounds up

    EXPECT_EQ(markerTime + NANOS_PER_BURST, model.convertPositionToTime(position + 17));

}