add unit tests for pcm_* functions

4 files changed, 589 insertions, 0 deletions

diff --git a/tests/include/pcm_test_device.h b/tests/include/pcm_test_device.h
new file mode 100644
index 0000000..1932737
--- /dev/null
+++ b/tests/include/pcm_test_device.h
@@ -0,0 +1,49 @@
+/* pcm_test.h
+**
+** Copyright 2020, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+
+#ifndef TINYALSA_TESTS_PCM_TEST_H_
+#define TINYALSA_TESTS_PCM_TEST_H_
+
+namespace tinyalsa {
+namespace testing {
+
+#ifndef TEST_LOOPBACK_CARD
+#define TEST_LOOPBACK_CARD 2
+#endif
+
+#ifndef TEST_LOOPBACK_PALYBACK_DEVICE
+#define TEST_LOOPBACK_PALYBACK_DEVICE 0
+#endif
+
+constexpr unsigned int kLoopbackCard = TEST_LOOPBACK_CARD;
+constexpr unsigned int kLoopbackPlaybackDevice = TEST_LOOPBACK_PALYBACK_DEVICE;
+
+} // namespace testing
+} // namespace tinyalse
+
+#endif
diff --git a/tests/src/pcm_out_test.cc b/tests/src/pcm_out_test.cc
new file mode 100644
index 0000000..5939565
--- /dev/null
+++ b/tests/src/pcm_out_test.cc
@@ -0,0 +1,216 @@
+/* pcm_out_test.c
+**
+** Copyright 2020, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+#include "pcm_test_device.h"
+
+#include <chrono>
+#include <cstring>
+#include <iostream>
+
+#include <gtest/gtest.h>
+
+#include "tinyalsa/pcm.h"
+
+namespace tinyalsa {
+namespace testing {
+
+class PcmOutTest : public ::testing::Test {
+  protected:
+    PcmOutTest() : pcm_object(nullptr) {}
+    virtual ~PcmOutTest() = default;
+
+    virtual void SetUp() override {
+        pcm_object = pcm_open(kLoopbackCard, kLoopbackPlaybackDevice, PCM_OUT, &kDefaultConfig);
+        ASSERT_NE(pcm_object, nullptr);
+        ASSERT_TRUE(pcm_is_ready(pcm_object));
+    }
+
+    virtual void TearDown() override {
+        ASSERT_EQ(pcm_close(pcm_object), 0);
+    }
+
+    static constexpr unsigned int kDefaultChannels = 2;
+    static constexpr unsigned int kDefaultSamplingRate = 48000;
+    static constexpr unsigned int kDefaultPeriodSize = 1024;
+    static constexpr unsigned int kDefaultPeriodCount = 3;
+    static constexpr pcm_config kDefaultConfig = {
+        .channels = kDefaultChannels,
+        .rate = kDefaultSamplingRate,
+        .period_size = kDefaultPeriodSize,
+        .period_count = kDefaultPeriodCount,
+        .format = PCM_FORMAT_S16_LE,
+        .start_threshold = kDefaultPeriodSize,
+        .stop_threshold = kDefaultPeriodSize * kDefaultPeriodCount,
+        .silence_threshold = 0,
+        .silence_size = 0,
+    };
+
+    pcm* pcm_object;
+};
+
+TEST_F(PcmOutTest, GetFileDescriptor) {
+    ASSERT_GT(pcm_get_file_descriptor(pcm_object), 0);
+}
+
+TEST_F(PcmOutTest, GetChannels) {
+    ASSERT_EQ(pcm_get_channels(pcm_object), kDefaultConfig.channels);
+}
+
+TEST_F(PcmOutTest, GetSamplingRate) {
+    ASSERT_EQ(pcm_get_rate(pcm_object), kDefaultConfig.rate);
+}
+
+TEST_F(PcmOutTest, GetFormat) {
+    ASSERT_EQ(pcm_get_format(pcm_object), kDefaultConfig.format);
+
+}
+
+TEST_F(PcmOutTest, GetErrorMessage) {
+    ASSERT_STREQ(pcm_get_error(pcm_object), "");
+}
+
+TEST_F(PcmOutTest, GetConfig) {
+    ASSERT_EQ(pcm_get_config(nullptr), nullptr);
+    ASSERT_EQ(std::memcmp(pcm_get_config(pcm_object), &kDefaultConfig, sizeof(pcm_config)), 0);
+}
+
+TEST_F(PcmOutTest, SetConfig) {
+    ASSERT_EQ(pcm_set_config(nullptr, nullptr), -EFAULT);
+    ASSERT_EQ(pcm_set_config(pcm_object, nullptr), 0);
+}
+
+TEST_F(PcmOutTest, GetBufferSize) {
+    unsigned int buffer_size = pcm_get_buffer_size(pcm_object);
+    ASSERT_EQ(buffer_size, kDefaultConfig.period_count * kDefaultConfig.period_size);
+}
+
+TEST_F(PcmOutTest, FramesBytesConvert) {
+    unsigned int bytes = pcm_frames_to_bytes(pcm_object, 1);
+    ASSERT_EQ(bytes, pcm_format_to_bits(kDefaultConfig.format) / 8 * kDefaultConfig.channels);
+
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, bytes + 1);
+    ASSERT_EQ(frames, 1);
+}
+
+TEST_F(PcmOutTest, GetAvailableAndTimestamp) {
+    unsigned int available = 0;
+    timespec time = { 0 };
+
+    ASSERT_LT(pcm_get_htimestamp(nullptr, nullptr, nullptr), 0);
+
+    ASSERT_EQ(pcm_get_htimestamp(pcm_object, &available, &time), 0);
+    ASSERT_NE(available, 0);
+    // ASSERT_NE(time.tv_nsec | time.tv_sec, 0);
+}
+
+TEST_F(PcmOutTest, GetSubdevice) {
+    ASSERT_EQ(pcm_get_subdevice(pcm_object), 0);
+}
+
+TEST_F(PcmOutTest, Readi) {
+    size_t buffer_size = pcm_frames_to_bytes(pcm_object, kDefaultConfig.period_size);
+    auto buffer = std::make_unique<char[]>(buffer_size);
+
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, buffer_size);
+    ASSERT_EQ(pcm_readi(pcm_object, buffer.get(), frames), -EINVAL);
+}
+
+TEST_F(PcmOutTest, Writei) {
+    constexpr uint32_t write_count = 20;
+
+    size_t buffer_size = pcm_frames_to_bytes(pcm_object, kDefaultConfig.period_size);
+    auto buffer = std::make_unique<char[]>(buffer_size);
+    for (uint32_t i = 0; i < buffer_size; ++i) {
+        buffer[i] = static_cast<char>(i);
+    }
+
+    int written_frames = 0;
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, buffer_size);
+    auto start = std::chrono::steady_clock::now();
+    for (uint32_t i = 0; i < write_count; ++i) {
+        written_frames = pcm_writei(pcm_object, buffer.get(), frames);
+        ASSERT_EQ(written_frames, frames);
+    }
+
+    std::chrono::duration<double> difference = std::chrono::steady_clock::now() - start;
+    std::chrono::milliseconds expected_elapsed_time_ms(frames *
+            (write_count - kDefaultConfig.period_count) / (kDefaultConfig.rate / 1000));
+
+    std::cout << difference.count() << std::endl;
+    std::cout << expected_elapsed_time_ms.count() << std::endl;
+
+    ASSERT_NEAR(difference.count() * 1000, expected_elapsed_time_ms.count(), 100);
+}
+
+class PcmOutMmapTest : public PcmOutTest {
+  protected:
+    PcmOutMmapTest() = default;
+    ~PcmOutMmapTest() = default;
+
+    virtual void SetUp() override {
+        pcm_object = pcm_open(kLoopbackCard, kLoopbackPlaybackDevice, PCM_OUT | PCM_MMAP,
+                &kDefaultConfig);
+        ASSERT_NE(pcm_object, nullptr);
+        ASSERT_TRUE(pcm_is_ready(pcm_object));
+    }
+
+    virtual void TearDown() override {
+        ASSERT_EQ(pcm_close(pcm_object), 0);
+    }
+};
+
+TEST_F(PcmOutMmapTest, Write) {
+    constexpr uint32_t write_count = 20;
+
+    size_t buffer_size = pcm_frames_to_bytes(pcm_object, kDefaultConfig.period_size);
+    auto buffer = std::make_unique<char[]>(buffer_size);
+    for (uint32_t i = 0; i < buffer_size; ++i) {
+        buffer[i] = static_cast<char>(i);
+    }
+
+    int written_frames = 0;
+    unsigned int frames = pcm_bytes_to_frames(pcm_object, buffer_size);
+    pcm_start(pcm_object);
+    auto start = std::chrono::steady_clock::now();
+    for (uint32_t i = 0; i < write_count; ++i) {
+        written_frames = pcm_mmap_write(pcm_object, buffer.get(), buffer_size);
+        ASSERT_EQ(written_frames, frames);
+    }
+    pcm_stop(pcm_object);
+
+    std::chrono::duration<double> difference = std::chrono::steady_clock::now() - start;
+    std::chrono::milliseconds expected_elapsed_time_ms(frames *
+            (write_count - kDefaultConfig.period_count) / (kDefaultConfig.rate / 1000));
+
+    std::cout << difference.count() << std::endl;
+    std::cout << expected_elapsed_time_ms.count() << std::endl;
+
+    ASSERT_NEAR(difference.count() * 1000, expected_elapsed_time_ms.count(), 100);
+}
+
+} // namespace testing
+} // namespace tinyalse
diff --git a/tests/src/pcm_params_test.cc b/tests/src/pcm_params_test.cc
new file mode 100644
index 0000000..18c3c2c
--- /dev/null
+++ b/tests/src/pcm_params_test.cc
@@ -0,0 +1,221 @@
+/* pcm_params_test.c
+**
+** Copyright 2020, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+
+#include "pcm_test_device.h"
+
+#include <cstring>
+#include <iostream>
+#include <memory>
+
+#include <gtest/gtest.h>
+
+#include "tinyalsa/pcm.h"
+
+namespace tinyalsa {
+namespace testing {
+
+static inline unsigned int OrAllBits(const pcm_mask *mask) {
+    unsigned int res = 0;
+    for (uint32_t i = 0; i < 32 / sizeof(unsigned int); ++i) {
+        res |= mask->bits[i];
+    }
+    return res;
+}
+
+TEST(PcmParamsTest, GetAndFreeParams) {
+    pcm_params *params = nullptr;
+
+    // test to get nonexistent card and device.
+    params = pcm_params_get(1000, 1000, PCM_IN);
+    ASSERT_EQ(params, nullptr);
+
+    // test free null params.
+    pcm_params_free(params);
+
+    // assume that card 0, device 0 is always available.
+    params = pcm_params_get(0, 0, PCM_OUT);
+    ASSERT_NE(params, nullptr);
+    pcm_params_free(params);
+}
+
+TEST(PcmParamsTest, GetParamsBitMask) {
+    // test to get mask with null params
+    ASSERT_EQ(pcm_params_get_mask(nullptr, PCM_PARAM_ACCESS), nullptr);
+
+    // assume that card 0, device 0 is always available.
+    pcm_params *params = pcm_params_get(0, 0, PCM_OUT);
+    ASSERT_NE(params, nullptr);
+
+    // test to get param which is not described in bit mask format
+    ASSERT_EQ(pcm_params_get_mask(params, PCM_PARAM_SAMPLE_BITS), nullptr);
+
+    // test to get mask out of pcm_param enum
+    ASSERT_EQ(pcm_params_get_mask(params, static_cast<pcm_param>(100)), nullptr);
+
+    const pcm_mask *mask = pcm_params_get_mask(params, PCM_PARAM_ACCESS);
+    ASSERT_NE(mask, nullptr);
+
+    pcm_params_free(params);
+}
+
+TEST(PcmParamsTest, GetParamsInterval) {
+    // test to get interval with null params
+    ASSERT_EQ(pcm_params_get_min(nullptr, PCM_PARAM_SAMPLE_BITS), 0);
+    ASSERT_EQ(pcm_params_get_max(nullptr, PCM_PARAM_SAMPLE_BITS), 0);
+
+    // assume that card 0, device 0 is always available.
+    pcm_params *params = pcm_params_get(0, 0, PCM_OUT);
+    ASSERT_NE(params, nullptr);
+
+    // test to get param which is not described in interval format
+    ASSERT_EQ(pcm_params_get_min(params, PCM_PARAM_ACCESS), 0);
+    ASSERT_EQ(pcm_params_get_max(params, PCM_PARAM_ACCESS), 0);
+
+    // test to get interval out of pcm_param enum
+    ASSERT_EQ(pcm_params_get_min(params, static_cast<pcm_param>(100)), 0);
+    ASSERT_EQ(pcm_params_get_max(params, static_cast<pcm_param>(100)), 0);
+
+    pcm_params_free(params);
+}
+
+TEST(PcmParamsTest, ParamsToString) {
+    // assume that card 0, device 0 is always available.
+    pcm_params *params = pcm_params_get(0, 0, PCM_OUT);
+    ASSERT_NE(params, nullptr);
+
+    char long_string[1024] = { 0 };
+    int count = pcm_params_to_string(params, long_string, sizeof(long_string));
+    ASSERT_LE(static_cast<size_t>(count), sizeof(long_string));
+    ASSERT_GT(static_cast<size_t>(count), 0);
+
+    char short_string[1] = { 0 };
+    count = pcm_params_to_string(params, short_string, sizeof(short_string));
+    ASSERT_GT(static_cast<size_t>(count), sizeof(short_string));
+
+    int proper_string_len = count;
+    int proper_string_size = proper_string_len + 1;
+    auto proper_string = std::make_unique<char[]>(proper_string_size);
+    count = pcm_params_to_string(params, proper_string.get(), proper_string_size);
+    ASSERT_GT(static_cast<size_t>(count), 0);
+    ASSERT_EQ(static_cast<size_t>(count), proper_string_len);
+    ASSERT_EQ(std::strlen(proper_string.get()), proper_string_len);
+    pcm_params_free(params);
+}
+
+TEST(PcmParamsTest, GetPlaybackDeviceParams) {
+    pcm_params *params = pcm_params_get(kLoopbackCard, kLoopbackPlaybackDevice, PCM_OUT);
+    ASSERT_NE(params, nullptr);
+
+    const pcm_mask *access_mask = pcm_params_get_mask(params, PCM_PARAM_ACCESS);
+    ASSERT_NE(access_mask, nullptr);
+    ASSERT_NE(OrAllBits(access_mask), 0);
+
+    const pcm_mask *format_mask = pcm_params_get_mask(params, PCM_PARAM_FORMAT);
+    ASSERT_NE(format_mask, nullptr);
+    ASSERT_NE(OrAllBits(format_mask), 0);
+
+    const pcm_mask *subformat_mask = pcm_params_get_mask(params, PCM_PARAM_SUBFORMAT);
+    ASSERT_NE(subformat_mask, nullptr);
+    ASSERT_NE(OrAllBits(subformat_mask), 0);
+
+    unsigned int sample_bits_min = pcm_params_get_min(params, PCM_PARAM_SAMPLE_BITS);
+    unsigned int sample_bits_max = pcm_params_get_max(params, PCM_PARAM_SAMPLE_BITS);
+    std::cout << "sample_bits: " << sample_bits_min << " - " << sample_bits_max << std::endl;
+    ASSERT_GT(sample_bits_min, 0);
+    ASSERT_GT(sample_bits_max, 0);
+
+    unsigned int frame_bits_min = pcm_params_get_min(params, PCM_PARAM_FRAME_BITS);
+    unsigned int frame_bits_max = pcm_params_get_max(params, PCM_PARAM_FRAME_BITS);
+    std::cout << "frame_bits: " << frame_bits_min << " - " << frame_bits_max << std::endl;
+    ASSERT_GT(frame_bits_min, 0);
+    ASSERT_GT(frame_bits_max, 0);
+
+    unsigned int channels_min = pcm_params_get_min(params, PCM_PARAM_CHANNELS);
+    unsigned int channels_max = pcm_params_get_max(params, PCM_PARAM_CHANNELS);
+    std::cout << "channels: " << channels_min << " - " << channels_max << std::endl;
+    ASSERT_GT(channels_min, 0);
+    ASSERT_GT(channels_max, 0);
+
+    unsigned int sampling_rate_min = pcm_params_get_min(params, PCM_PARAM_RATE);
+    unsigned int sampling_rate_max = pcm_params_get_max(params, PCM_PARAM_RATE);
+    std::cout << "sampling_rate: " << sampling_rate_min << " - " << sampling_rate_max << std::endl;
+    ASSERT_GT(sampling_rate_min, 0);
+    ASSERT_GT(sampling_rate_max, 0);
+
+    unsigned int period_time_min = pcm_params_get_min(params, PCM_PARAM_PERIOD_TIME);
+    unsigned int period_time_max = pcm_params_get_max(params, PCM_PARAM_PERIOD_TIME);
+    std::cout << "period_time: " << period_time_min << " - " << period_time_max << std::endl;
+    ASSERT_GT(period_time_min, 0);
+    ASSERT_GT(period_time_max, 0);
+
+    unsigned int period_size_min = pcm_params_get_min(params, PCM_PARAM_PERIOD_SIZE);
+    unsigned int period_size_max = pcm_params_get_max(params, PCM_PARAM_PERIOD_SIZE);
+    std::cout << "period_size: " << period_size_min << " - " << period_size_max << std::endl;
+    ASSERT_GT(period_size_min, 0);
+    ASSERT_GT(period_size_max, 0);
+
+    unsigned int period_bytes_min = pcm_params_get_min(params, PCM_PARAM_PERIOD_BYTES);
+    unsigned int period_bytes_max = pcm_params_get_max(params, PCM_PARAM_PERIOD_BYTES);
+    std::cout << "period_bytes: " << period_bytes_min << " - " << period_bytes_max << std::endl;
+    ASSERT_GT(period_bytes_min, 0);
+    ASSERT_GT(period_bytes_max, 0);
+
+    unsigned int period_count_min = pcm_params_get_min(params, PCM_PARAM_PERIODS);
+    unsigned int period_count_max = pcm_params_get_max(params, PCM_PARAM_PERIODS);
+    std::cout << "period_count: " << period_count_min << " - " << period_count_max << std::endl;
+    ASSERT_GT(period_count_min, 0);
+    ASSERT_GT(period_count_max, 0);
+
+    unsigned int buffer_time_min = pcm_params_get_min(params, PCM_PARAM_BUFFER_TIME);
+    unsigned int buffer_time_max = pcm_params_get_max(params, PCM_PARAM_BUFFER_TIME);
+    std::cout << "buffer_time: " << buffer_time_min << " - " << buffer_time_max << std::endl;
+    ASSERT_GT(buffer_time_min, 0);
+    ASSERT_GT(buffer_time_max, 0);
+
+    unsigned int buffer_size_min = pcm_params_get_min(params, PCM_PARAM_BUFFER_SIZE);
+    unsigned int buffer_size_max = pcm_params_get_max(params, PCM_PARAM_BUFFER_SIZE);
+    std::cout << "buffer_size: " << buffer_size_min << " - " << buffer_size_max << std::endl;
+    ASSERT_GT(buffer_size_min, 0);
+    ASSERT_GT(buffer_size_max, 0);
+
+    unsigned int buffer_bytes_min = pcm_params_get_min(params, PCM_PARAM_BUFFER_BYTES);
+    unsigned int buffer_bytes_max = pcm_params_get_max(params, PCM_PARAM_BUFFER_BYTES);
+    std::cout << "buffer_bytes: " << buffer_bytes_min << " - " << buffer_bytes_max << std::endl;
+    ASSERT_GT(buffer_bytes_min, 0);
+    ASSERT_GT(buffer_bytes_max, 0);
+
+    unsigned int tick_in_us_min = pcm_params_get_min(params, PCM_PARAM_TICK_TIME);
+    unsigned int tick_in_us_max = pcm_params_get_max(params, PCM_PARAM_TICK_TIME);
+    ASSERT_GT(tick_in_us_max, 0);
+    std::cout << "tick_in_us: " << tick_in_us_min << " - " << tick_in_us_max << std::endl;
+
+    pcm_params_free(params);
+}
+
+} // namespace testing
+} // namespace tinyalse
diff --git a/tests/src/pcm_test.cc b/tests/src/pcm_test.cc
new file mode 100644
index 0000000..cf88fb7
--- /dev/null
+++ b/tests/src/pcm_test.cc
@@ -0,0 +1,103 @@
+/* pcm_out_test.c
+**
+** Copyright 2020, The Android Open Source Project
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of The Android Open Source Project nor the names of
+**       its contributors may be used to endorse or promote products derived
+**       from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
+** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+** DAMAGE.
+*/
+
+#include <string>
+#include <iostream>
+
+#include <gtest/gtest.h>
+
+#include "tinyalsa/pcm.h"
+
+namespace tinyalsa {
+namespace testing {
+
+TEST(PcmTest, FormatToBits) {
+    // FIXME: Should we return 16 bits for INVALID?
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_INVALID), 16);
+
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S16_LE), 16);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S32_LE), 32);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S8), 8);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S24_LE), 32);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S24_3LE), 24);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S16_BE), 16);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S24_BE), 32);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S24_3BE), 24);
+    ASSERT_EQ(pcm_format_to_bits(PCM_FORMAT_S32_BE), 32);
+}
+
+TEST(PcmTest, OpenAndCloseOutPcm) {
+    static constexpr unsigned int kDefaultChannels = 2;
+    static constexpr unsigned int kDefaultSamplingRate = 48000;
+    static constexpr unsigned int kDefaultPeriodSize = 1024;
+    static constexpr unsigned int kDefaultPeriodCount = 3;
+    static constexpr pcm_config kDefaultConfig = {
+        .channels = kDefaultChannels,
+        .rate = kDefaultSamplingRate,
+        .period_size = kDefaultPeriodSize,
+        .period_count = kDefaultPeriodCount,
+        .format = PCM_FORMAT_S16_LE,
+        .start_threshold = kDefaultPeriodSize,
+        .stop_threshold = kDefaultPeriodSize * kDefaultPeriodCount,
+        .silence_threshold = 0,
+        .silence_size = 0,
+    };
+
+    pcm *pcm_object = pcm_open(1000, 1000, PCM_OUT, &kDefaultConfig);
+    ASSERT_FALSE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    // assume card 0, device 0 is always available
+    pcm_object = pcm_open(0, 0, PCM_OUT, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    pcm_object = pcm_open(0, 0, PCM_OUT | PCM_MMAP, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    pcm_object = pcm_open(0, 0, PCM_OUT | PCM_MMAP | PCM_NOIRQ, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    pcm_object = pcm_open(0, 0, PCM_OUT | PCM_NONBLOCK, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    pcm_object = pcm_open(0, 0, PCM_OUT | PCM_MONOTONIC, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+
+    std::string name = "hw:0,0";
+    pcm_object = pcm_open_by_name(name.c_str(), PCM_OUT, &kDefaultConfig);
+    ASSERT_TRUE(pcm_is_ready(pcm_object));
+    ASSERT_EQ(pcm_close(pcm_object), 0);
+}
+
+} // namespace testing
+} // namespace tinyalse