audio: Move tinyALSA-specific code to Module/StreamAlsa
Extract code interacting with tinyALSA which is not
specific to USB into "abstract" module and stream
implementations ModuleAlsa and StreamAlsa. Also, move
utility code which does not need module or stream
context into Utils.
This facilitates implementation of the CF core HAL which
also uses tinyALSA, allowing to share common code.
Bug: 264712385
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I2134b15e970c78e8a48b254e15199b8207a8ab34
diff --git a/audio/aidl/default/alsa/Mixer.cpp b/audio/aidl/default/alsa/Mixer.cpp
new file mode 100644
index 0000000..f0393e3
--- /dev/null
+++ b/audio/aidl/default/alsa/Mixer.cpp
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#define LOG_TAG "AHAL_AlsaMixer"
+#include <android-base/logging.h>
+
+#include <cmath>
+
+#include <android/binder_status.h>
+
+#include "Mixer.h"
+
+namespace aidl::android::hardware::audio::core::alsa {
+
+//-----------------------------------------------------------------------------
+
+MixerControl::MixerControl(struct mixer_ctl* ctl)
+ : mCtl(ctl),
+ mNumValues(mixer_ctl_get_num_values(ctl)),
+ mMinValue(mixer_ctl_get_range_min(ctl)),
+ mMaxValue(mixer_ctl_get_range_max(ctl)) {}
+
+unsigned int MixerControl::getNumValues() const {
+ return mNumValues;
+}
+
+int MixerControl::getMaxValue() const {
+ return mMaxValue;
+}
+
+int MixerControl::getMinValue() const {
+ return mMinValue;
+}
+
+int MixerControl::setArray(const void* array, size_t count) {
+ const std::lock_guard guard(mLock);
+ return mixer_ctl_set_array(mCtl, array, count);
+}
+
+//-----------------------------------------------------------------------------
+
+// static
+const std::map<Mixer::Control, std::vector<Mixer::ControlNamesAndExpectedCtlType>>
+ Mixer::kPossibleControls = {
+ {Mixer::MASTER_SWITCH, {{"Master Playback Switch", MIXER_CTL_TYPE_BOOL}}},
+ {Mixer::MASTER_VOLUME, {{"Master Playback Volume", MIXER_CTL_TYPE_INT}}},
+ {Mixer::HW_VOLUME,
+ {{"Headphone Playback Volume", MIXER_CTL_TYPE_INT},
+ {"Headset Playback Volume", MIXER_CTL_TYPE_INT},
+ {"PCM Playback Volume", MIXER_CTL_TYPE_INT}}}};
+
+// static
+std::map<Mixer::Control, std::shared_ptr<MixerControl>> Mixer::initializeMixerControls(
+ struct mixer* mixer) {
+ std::map<Mixer::Control, std::shared_ptr<MixerControl>> mixerControls;
+ std::string mixerCtlNames;
+ for (const auto& [control, possibleCtls] : kPossibleControls) {
+ for (const auto& [ctlName, expectedCtlType] : possibleCtls) {
+ struct mixer_ctl* ctl = mixer_get_ctl_by_name(mixer, ctlName.c_str());
+ if (ctl != nullptr && mixer_ctl_get_type(ctl) == expectedCtlType) {
+ mixerControls.emplace(control, std::make_unique<MixerControl>(ctl));
+ if (!mixerCtlNames.empty()) {
+ mixerCtlNames += ",";
+ }
+ mixerCtlNames += ctlName;
+ break;
+ }
+ }
+ }
+ LOG(DEBUG) << __func__ << ": available mixer control names=[" << mixerCtlNames << "]";
+ return mixerControls;
+}
+
+Mixer::Mixer(struct mixer* mixer)
+ : mMixer(mixer), mMixerControls(initializeMixerControls(mMixer)) {}
+
+Mixer::~Mixer() {
+ mixer_close(mMixer);
+}
+
+namespace {
+
+int volumeFloatToInteger(float fValue, int maxValue, int minValue) {
+ return minValue + std::ceil((maxValue - minValue) * fValue);
+}
+
+} // namespace
+
+ndk::ScopedAStatus Mixer::setMasterMute(bool muted) {
+ auto it = mMixerControls.find(Mixer::MASTER_SWITCH);
+ if (it == mMixerControls.end()) {
+ return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+ }
+ const int numValues = it->second->getNumValues();
+ std::vector<int> values(numValues, muted ? 0 : 1);
+ if (int err = it->second->setArray(values.data(), numValues); err != 0) {
+ LOG(ERROR) << __func__ << ": failed to set master mute, err=" << err;
+ return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Mixer::setMasterVolume(float volume) {
+ auto it = mMixerControls.find(Mixer::MASTER_VOLUME);
+ if (it == mMixerControls.end()) {
+ return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+ }
+ const int numValues = it->second->getNumValues();
+ std::vector<int> values(numValues, volumeFloatToInteger(volume, it->second->getMaxValue(),
+ it->second->getMinValue()));
+ if (int err = it->second->setArray(values.data(), numValues); err != 0) {
+ LOG(ERROR) << __func__ << ": failed to set master volume, err=" << err;
+ return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus Mixer::setVolumes(const std::vector<float>& volumes) {
+ auto it = mMixerControls.find(Mixer::HW_VOLUME);
+ if (it == mMixerControls.end()) {
+ return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
+ }
+ const int numValues = it->second->getNumValues();
+ if (numValues < 0) {
+ LOG(FATAL) << __func__ << ": negative number of values: " << numValues;
+ }
+ const int maxValue = it->second->getMaxValue();
+ const int minValue = it->second->getMinValue();
+ std::vector<int> values;
+ size_t i = 0;
+ for (; i < static_cast<size_t>(numValues) && i < values.size(); ++i) {
+ values.emplace_back(volumeFloatToInteger(volumes[i], maxValue, minValue));
+ }
+ if (int err = it->second->setArray(values.data(), values.size()); err != 0) {
+ LOG(ERROR) << __func__ << ": failed to set volume, err=" << err;
+ return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+} // namespace aidl::android::hardware::audio::core::alsa
diff --git a/audio/aidl/default/alsa/Mixer.h b/audio/aidl/default/alsa/Mixer.h
new file mode 100644
index 0000000..de9e6f4
--- /dev/null
+++ b/audio/aidl/default/alsa/Mixer.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include <android-base/thread_annotations.h>
+#include <android/binder_auto_utils.h>
+
+extern "C" {
+#include <tinyalsa/mixer.h>
+}
+
+namespace aidl::android::hardware::audio::core::alsa {
+
+class MixerControl {
+ public:
+ explicit MixerControl(struct mixer_ctl* ctl);
+
+ unsigned int getNumValues() const;
+ int getMaxValue() const;
+ int getMinValue() const;
+ int setArray(const void* array, size_t count);
+
+ private:
+ std::mutex mLock;
+ // The mixer_ctl object is owned by ALSA and will be released when the mixer is closed.
+ struct mixer_ctl* mCtl GUARDED_BY(mLock);
+ const unsigned int mNumValues;
+ const int mMinValue;
+ const int mMaxValue;
+};
+
+class Mixer {
+ public:
+ explicit Mixer(struct mixer* mixer);
+
+ ~Mixer();
+
+ bool isValid() const { return mMixer != nullptr; }
+
+ ndk::ScopedAStatus setMasterMute(bool muted);
+ ndk::ScopedAStatus setMasterVolume(float volume);
+ ndk::ScopedAStatus setVolumes(const std::vector<float>& volumes);
+
+ private:
+ enum Control {
+ MASTER_SWITCH,
+ MASTER_VOLUME,
+ HW_VOLUME,
+ };
+ using ControlNamesAndExpectedCtlType = std::pair<std::string, enum mixer_ctl_type>;
+ static const std::map<Control, std::vector<ControlNamesAndExpectedCtlType>> kPossibleControls;
+ static std::map<Control, std::shared_ptr<MixerControl>> initializeMixerControls(
+ struct mixer* mixer);
+
+ // The mixer object is owned by ALSA and will be released when the mixer is closed.
+ struct mixer* mMixer;
+ // `mMixerControls` will only be initialized in constructor. After that, it wil only be
+ // read but not be modified.
+ const std::map<Control, std::shared_ptr<MixerControl>> mMixerControls;
+};
+
+} // namespace aidl::android::hardware::audio::core::alsa
diff --git a/audio/aidl/default/alsa/ModuleAlsa.cpp b/audio/aidl/default/alsa/ModuleAlsa.cpp
new file mode 100644
index 0000000..8e75d56
--- /dev/null
+++ b/audio/aidl/default/alsa/ModuleAlsa.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#define LOG_TAG "AHAL_ModuleAlsa"
+
+#include <vector>
+
+#include <android-base/logging.h>
+
+#include "Utils.h"
+#include "core-impl/ModuleAlsa.h"
+
+extern "C" {
+#include "alsa_device_profile.h"
+}
+
+using aidl::android::media::audio::common::AudioChannelLayout;
+using aidl::android::media::audio::common::AudioFormatType;
+using aidl::android::media::audio::common::AudioPort;
+using aidl::android::media::audio::common::AudioProfile;
+
+namespace aidl::android::hardware::audio::core {
+
+ndk::ScopedAStatus ModuleAlsa::populateConnectedDevicePort(AudioPort* audioPort) {
+ auto deviceProfile = alsa::getDeviceProfile(*audioPort);
+ if (!deviceProfile.has_value()) {
+ return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+ }
+ auto profile = alsa::readAlsaDeviceInfo(*deviceProfile);
+ if (!profile.has_value()) {
+ return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+ }
+
+ std::vector<AudioChannelLayout> channels = alsa::getChannelMasksFromProfile(&profile.value());
+ std::vector<int> sampleRates = alsa::getSampleRatesFromProfile(&profile.value());
+
+ for (size_t i = 0; i < std::min(MAX_PROFILE_FORMATS, AUDIO_PORT_MAX_AUDIO_PROFILES) &&
+ profile->formats[i] != PCM_FORMAT_INVALID;
+ ++i) {
+ auto audioFormatDescription =
+ alsa::c2aidl_pcm_format_AudioFormatDescription(profile->formats[i]);
+ if (audioFormatDescription.type == AudioFormatType::DEFAULT) {
+ LOG(WARNING) << __func__ << ": unknown pcm type=" << profile->formats[i];
+ continue;
+ }
+ AudioProfile audioProfile = {.format = audioFormatDescription,
+ .channelMasks = channels,
+ .sampleRates = sampleRates};
+ audioPort->profiles.push_back(std::move(audioProfile));
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+} // namespace aidl::android::hardware::audio::core
diff --git a/audio/aidl/default/alsa/StreamAlsa.cpp b/audio/aidl/default/alsa/StreamAlsa.cpp
new file mode 100644
index 0000000..ecb3c78
--- /dev/null
+++ b/audio/aidl/default/alsa/StreamAlsa.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2023 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 <limits>
+
+#define LOG_TAG "AHAL_StreamAlsa"
+#include <android-base/logging.h>
+
+#include <Utils.h>
+#include <error/expected_utils.h>
+
+#include "core-impl/StreamAlsa.h"
+
+namespace aidl::android::hardware::audio::core {
+
+StreamAlsa::StreamAlsa(const Metadata& metadata, StreamContext&& context)
+ : StreamCommonImpl(metadata, std::move(context)),
+ mFrameSizeBytes(getContext().getFrameSize()),
+ mIsInput(isInput(metadata)),
+ mConfig(alsa::getPcmConfig(getContext(), mIsInput)) {}
+
+::android::status_t StreamAlsa::init() {
+ return mConfig.has_value() ? ::android::OK : ::android::NO_INIT;
+}
+
+::android::status_t StreamAlsa::standby() {
+ mAlsaDeviceProxies.clear();
+ return ::android::OK;
+}
+
+::android::status_t StreamAlsa::start() {
+ decltype(mAlsaDeviceProxies) alsaDeviceProxies;
+ for (const auto& device : getDeviceProfiles()) {
+ auto profile = alsa::readAlsaDeviceInfo(device);
+ if (!profile.has_value()) {
+ LOG(ERROR) << __func__ << ": unable to read device info, device address=" << device;
+ return ::android::UNKNOWN_ERROR;
+ }
+
+ auto proxy = alsa::makeDeviceProxy();
+ // Always ask for alsa configure as required since the configuration should be supported
+ // by the connected device. That is guaranteed by `setAudioPortConfig` and `setAudioPatch`.
+ if (int err = proxy_prepare(proxy.get(), &profile.value(),
+ const_cast<struct pcm_config*>(&mConfig.value()),
+ true /*require_exact_match*/);
+ err != 0) {
+ LOG(ERROR) << __func__ << ": fail to prepare for device address=" << device
+ << " error=" << err;
+ return ::android::UNKNOWN_ERROR;
+ }
+ if (int err = proxy_open(proxy.get()); err != 0) {
+ LOG(ERROR) << __func__ << ": failed to open device, address=" << device
+ << " error=" << err;
+ return ::android::UNKNOWN_ERROR;
+ }
+ alsaDeviceProxies.push_back(std::move(proxy));
+ }
+ mAlsaDeviceProxies = std::move(alsaDeviceProxies);
+ return ::android::OK;
+}
+
+::android::status_t StreamAlsa::transfer(void* buffer, size_t frameCount, size_t* actualFrameCount,
+ int32_t* latencyMs) {
+ const size_t bytesToTransfer = frameCount * mFrameSizeBytes;
+ unsigned maxLatency = 0;
+ if (mIsInput) {
+ if (mAlsaDeviceProxies.empty()) {
+ LOG(FATAL) << __func__ << ": no input devices";
+ return ::android::NO_INIT;
+ }
+ // For input case, only support single device.
+ proxy_read(mAlsaDeviceProxies[0].get(), buffer, bytesToTransfer);
+ maxLatency = proxy_get_latency(mAlsaDeviceProxies[0].get());
+ } else {
+ for (auto& proxy : mAlsaDeviceProxies) {
+ proxy_write(proxy.get(), buffer, bytesToTransfer);
+ maxLatency = std::max(maxLatency, proxy_get_latency(proxy.get()));
+ }
+ }
+ *actualFrameCount = frameCount;
+ maxLatency = std::min(maxLatency, static_cast<unsigned>(std::numeric_limits<int32_t>::max()));
+ *latencyMs = maxLatency;
+ return ::android::OK;
+}
+
+void StreamAlsa::shutdown() {
+ mAlsaDeviceProxies.clear();
+}
+
+} // namespace aidl::android::hardware::audio::core
diff --git a/audio/aidl/default/alsa/Utils.cpp b/audio/aidl/default/alsa/Utils.cpp
new file mode 100644
index 0000000..162f852
--- /dev/null
+++ b/audio/aidl/default/alsa/Utils.cpp
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2023 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 <map>
+#include <set>
+
+#define LOG_TAG "AHAL_AlsaUtils"
+#include <Utils.h>
+#include <aidl/android/media/audio/common/AudioFormatType.h>
+#include <aidl/android/media/audio/common/PcmType.h>
+#include <android-base/logging.h>
+
+#include "Utils.h"
+#include "core-impl/utils.h"
+
+using aidl::android::hardware::audio::common::getChannelCount;
+using aidl::android::media::audio::common::AudioChannelLayout;
+using aidl::android::media::audio::common::AudioDeviceAddress;
+using aidl::android::media::audio::common::AudioFormatDescription;
+using aidl::android::media::audio::common::AudioFormatType;
+using aidl::android::media::audio::common::AudioIoFlags;
+using aidl::android::media::audio::common::AudioPortExt;
+using aidl::android::media::audio::common::PcmType;
+
+namespace aidl::android::hardware::audio::core::alsa {
+
+namespace {
+
+using AudioChannelCountToMaskMap = std::map<unsigned int, AudioChannelLayout>;
+using AudioFormatDescToPcmFormatMap = std::map<AudioFormatDescription, enum pcm_format>;
+using PcmFormatToAudioFormatDescMap = std::map<enum pcm_format, AudioFormatDescription>;
+
+AudioChannelLayout getInvalidChannelLayout() {
+ static const AudioChannelLayout invalidChannelLayout =
+ AudioChannelLayout::make<AudioChannelLayout::Tag::invalid>(0);
+ return invalidChannelLayout;
+}
+
+static AudioChannelCountToMaskMap make_ChannelCountToMaskMap(
+ const std::set<AudioChannelLayout>& channelMasks) {
+ AudioChannelCountToMaskMap channelMaskToCountMap;
+ for (const auto& channelMask : channelMasks) {
+ channelMaskToCountMap.emplace(getChannelCount(channelMask), channelMask);
+ }
+ return channelMaskToCountMap;
+}
+
+#define DEFINE_CHANNEL_LAYOUT_MASK(n) \
+ AudioChannelLayout::make<AudioChannelLayout::Tag::layoutMask>(AudioChannelLayout::LAYOUT_##n)
+
+const AudioChannelCountToMaskMap& getSupportedChannelOutLayoutMap() {
+ static const std::set<AudioChannelLayout> supportedOutChannelLayouts = {
+ DEFINE_CHANNEL_LAYOUT_MASK(MONO), DEFINE_CHANNEL_LAYOUT_MASK(STEREO),
+ DEFINE_CHANNEL_LAYOUT_MASK(2POINT1), DEFINE_CHANNEL_LAYOUT_MASK(QUAD),
+ DEFINE_CHANNEL_LAYOUT_MASK(PENTA), DEFINE_CHANNEL_LAYOUT_MASK(5POINT1),
+ DEFINE_CHANNEL_LAYOUT_MASK(6POINT1), DEFINE_CHANNEL_LAYOUT_MASK(7POINT1),
+ DEFINE_CHANNEL_LAYOUT_MASK(7POINT1POINT4), DEFINE_CHANNEL_LAYOUT_MASK(22POINT2),
+ };
+ static const AudioChannelCountToMaskMap outLayouts =
+ make_ChannelCountToMaskMap(supportedOutChannelLayouts);
+ return outLayouts;
+}
+
+const AudioChannelCountToMaskMap& getSupportedChannelInLayoutMap() {
+ static const std::set<AudioChannelLayout> supportedInChannelLayouts = {
+ DEFINE_CHANNEL_LAYOUT_MASK(MONO),
+ DEFINE_CHANNEL_LAYOUT_MASK(STEREO),
+ };
+ static const AudioChannelCountToMaskMap inLayouts =
+ make_ChannelCountToMaskMap(supportedInChannelLayouts);
+ return inLayouts;
+}
+
+#undef DEFINE_CHANNEL_LAYOUT_MASK
+#define DEFINE_CHANNEL_INDEX_MASK(n) \
+ AudioChannelLayout::make<AudioChannelLayout::Tag::indexMask>(AudioChannelLayout::INDEX_MASK_##n)
+
+const AudioChannelCountToMaskMap& getSupportedChannelIndexLayoutMap() {
+ static const std::set<AudioChannelLayout> supportedIndexChannelLayouts = {
+ DEFINE_CHANNEL_INDEX_MASK(1), DEFINE_CHANNEL_INDEX_MASK(2),
+ DEFINE_CHANNEL_INDEX_MASK(3), DEFINE_CHANNEL_INDEX_MASK(4),
+ DEFINE_CHANNEL_INDEX_MASK(5), DEFINE_CHANNEL_INDEX_MASK(6),
+ DEFINE_CHANNEL_INDEX_MASK(7), DEFINE_CHANNEL_INDEX_MASK(8),
+ DEFINE_CHANNEL_INDEX_MASK(9), DEFINE_CHANNEL_INDEX_MASK(10),
+ DEFINE_CHANNEL_INDEX_MASK(11), DEFINE_CHANNEL_INDEX_MASK(12),
+ DEFINE_CHANNEL_INDEX_MASK(13), DEFINE_CHANNEL_INDEX_MASK(14),
+ DEFINE_CHANNEL_INDEX_MASK(15), DEFINE_CHANNEL_INDEX_MASK(16),
+ DEFINE_CHANNEL_INDEX_MASK(17), DEFINE_CHANNEL_INDEX_MASK(18),
+ DEFINE_CHANNEL_INDEX_MASK(19), DEFINE_CHANNEL_INDEX_MASK(20),
+ DEFINE_CHANNEL_INDEX_MASK(21), DEFINE_CHANNEL_INDEX_MASK(22),
+ DEFINE_CHANNEL_INDEX_MASK(23), DEFINE_CHANNEL_INDEX_MASK(24),
+ };
+ static const AudioChannelCountToMaskMap indexLayouts =
+ make_ChannelCountToMaskMap(supportedIndexChannelLayouts);
+ return indexLayouts;
+}
+
+#undef DEFINE_CHANNEL_INDEX_MASK
+
+AudioFormatDescription make_AudioFormatDescription(AudioFormatType type) {
+ AudioFormatDescription result;
+ result.type = type;
+ return result;
+}
+
+AudioFormatDescription make_AudioFormatDescription(PcmType pcm) {
+ auto result = make_AudioFormatDescription(AudioFormatType::PCM);
+ result.pcm = pcm;
+ return result;
+}
+
+const AudioFormatDescToPcmFormatMap& getAudioFormatDescriptorToPcmFormatMap() {
+ static const AudioFormatDescToPcmFormatMap formatDescToPcmFormatMap = {
+ {make_AudioFormatDescription(PcmType::UINT_8_BIT), PCM_FORMAT_S8},
+ {make_AudioFormatDescription(PcmType::INT_16_BIT), PCM_FORMAT_S16_LE},
+ {make_AudioFormatDescription(PcmType::FIXED_Q_8_24), PCM_FORMAT_S24_LE},
+ {make_AudioFormatDescription(PcmType::INT_24_BIT), PCM_FORMAT_S24_3LE},
+ {make_AudioFormatDescription(PcmType::INT_32_BIT), PCM_FORMAT_S32_LE},
+ {make_AudioFormatDescription(PcmType::FLOAT_32_BIT), PCM_FORMAT_FLOAT_LE},
+ };
+ return formatDescToPcmFormatMap;
+}
+
+static PcmFormatToAudioFormatDescMap make_PcmFormatToAudioFormatDescMap(
+ const AudioFormatDescToPcmFormatMap& formatDescToPcmFormatMap) {
+ PcmFormatToAudioFormatDescMap result;
+ for (const auto& formatPair : formatDescToPcmFormatMap) {
+ result.emplace(formatPair.second, formatPair.first);
+ }
+ return result;
+}
+
+const PcmFormatToAudioFormatDescMap& getPcmFormatToAudioFormatDescMap() {
+ static const PcmFormatToAudioFormatDescMap pcmFormatToFormatDescMap =
+ make_PcmFormatToAudioFormatDescMap(getAudioFormatDescriptorToPcmFormatMap());
+ return pcmFormatToFormatDescMap;
+}
+
+} // namespace
+
+std::ostream& operator<<(std::ostream& os, const DeviceProfile& device) {
+ return os << "<" << device.card << "," << device.device << ">";
+}
+
+AudioChannelLayout getChannelLayoutMaskFromChannelCount(unsigned int channelCount, int isInput) {
+ return findValueOrDefault(
+ isInput ? getSupportedChannelInLayoutMap() : getSupportedChannelOutLayoutMap(),
+ channelCount, getInvalidChannelLayout());
+}
+
+AudioChannelLayout getChannelIndexMaskFromChannelCount(unsigned int channelCount) {
+ return findValueOrDefault(getSupportedChannelIndexLayoutMap(), channelCount,
+ getInvalidChannelLayout());
+}
+
+unsigned int getChannelCountFromChannelMask(const AudioChannelLayout& channelMask, bool isInput) {
+ switch (channelMask.getTag()) {
+ case AudioChannelLayout::Tag::layoutMask: {
+ return findKeyOrDefault(
+ isInput ? getSupportedChannelInLayoutMap() : getSupportedChannelOutLayoutMap(),
+ static_cast<unsigned>(getChannelCount(channelMask)), 0u /*defaultValue*/);
+ }
+ case AudioChannelLayout::Tag::indexMask: {
+ return findKeyOrDefault(getSupportedChannelIndexLayoutMap(),
+ static_cast<unsigned>(getChannelCount(channelMask)),
+ 0u /*defaultValue*/);
+ }
+ case AudioChannelLayout::Tag::none:
+ case AudioChannelLayout::Tag::invalid:
+ case AudioChannelLayout::Tag::voiceMask:
+ default:
+ return 0;
+ }
+}
+
+std::vector<AudioChannelLayout> getChannelMasksFromProfile(const alsa_device_profile* profile) {
+ const bool isInput = profile->direction == PCM_IN;
+ std::vector<AudioChannelLayout> channels;
+ for (size_t i = 0; i < AUDIO_PORT_MAX_CHANNEL_MASKS && profile->channel_counts[i] != 0; ++i) {
+ auto layoutMask =
+ alsa::getChannelLayoutMaskFromChannelCount(profile->channel_counts[i], isInput);
+ if (layoutMask.getTag() == AudioChannelLayout::Tag::layoutMask) {
+ channels.push_back(layoutMask);
+ }
+ auto indexMask = alsa::getChannelIndexMaskFromChannelCount(profile->channel_counts[i]);
+ if (indexMask.getTag() == AudioChannelLayout::Tag::indexMask) {
+ channels.push_back(indexMask);
+ }
+ }
+ return channels;
+}
+
+std::optional<DeviceProfile> getDeviceProfile(
+ const ::aidl::android::media::audio::common::AudioDevice& audioDevice, bool isInput) {
+ if (audioDevice.address.getTag() != AudioDeviceAddress::Tag::alsa) {
+ LOG(ERROR) << __func__ << ": not alsa address: " << audioDevice.toString();
+ return std::nullopt;
+ }
+ auto& alsaAddress = audioDevice.address.get<AudioDeviceAddress::Tag::alsa>();
+ if (alsaAddress.size() != 2 || alsaAddress[0] < 0 || alsaAddress[1] < 0) {
+ LOG(ERROR) << __func__
+ << ": malformed alsa address: " << ::android::internal::ToString(alsaAddress);
+ return std::nullopt;
+ }
+ return DeviceProfile{.card = alsaAddress[0],
+ .device = alsaAddress[1],
+ .direction = isInput ? PCM_IN : PCM_OUT};
+}
+
+std::optional<DeviceProfile> getDeviceProfile(
+ const ::aidl::android::media::audio::common::AudioPort& audioPort) {
+ if (audioPort.ext.getTag() != AudioPortExt::Tag::device) {
+ LOG(ERROR) << __func__ << ": port id " << audioPort.id << " is not a device port";
+ return std::nullopt;
+ }
+ auto& devicePort = audioPort.ext.get<AudioPortExt::Tag::device>();
+ return getDeviceProfile(devicePort.device, audioPort.flags.getTag() == AudioIoFlags::input);
+}
+
+std::optional<struct pcm_config> getPcmConfig(const StreamContext& context, bool isInput) {
+ struct pcm_config config;
+ config.channels = alsa::getChannelCountFromChannelMask(context.getChannelLayout(), isInput);
+ if (config.channels == 0) {
+ LOG(ERROR) << __func__ << ": invalid channel=" << context.getChannelLayout().toString();
+ return std::nullopt;
+ }
+ config.format = alsa::aidl2c_AudioFormatDescription_pcm_format(context.getFormat());
+ if (config.format == PCM_FORMAT_INVALID) {
+ LOG(ERROR) << __func__ << ": invalid format=" << context.getFormat().toString();
+ return std::nullopt;
+ }
+ config.rate = context.getSampleRate();
+ if (config.rate == 0) {
+ LOG(ERROR) << __func__ << ": invalid sample rate=" << config.rate;
+ return std::nullopt;
+ }
+ return config;
+}
+
+std::vector<int> getSampleRatesFromProfile(const alsa_device_profile* profile) {
+ std::vector<int> sampleRates;
+ for (int i = 0; i < std::min(MAX_PROFILE_SAMPLE_RATES, AUDIO_PORT_MAX_SAMPLING_RATES) &&
+ profile->sample_rates[i] != 0;
+ i++) {
+ sampleRates.push_back(profile->sample_rates[i]);
+ }
+ return sampleRates;
+}
+
+DeviceProxy makeDeviceProxy() {
+ return DeviceProxy(new alsa_device_proxy, [](alsa_device_proxy* proxy) {
+ if (proxy != nullptr) {
+ proxy_close(proxy);
+ delete proxy;
+ }
+ });
+}
+
+std::optional<alsa_device_profile> readAlsaDeviceInfo(const DeviceProfile& deviceProfile) {
+ alsa_device_profile profile;
+ profile_init(&profile, deviceProfile.direction);
+ profile.card = deviceProfile.card;
+ profile.device = deviceProfile.device;
+ if (!profile_read_device_info(&profile)) {
+ LOG(ERROR) << __func__ << ": failed to read device info, card=" << profile.card
+ << ", device=" << profile.device;
+ return std::nullopt;
+ }
+ return profile;
+}
+
+AudioFormatDescription c2aidl_pcm_format_AudioFormatDescription(enum pcm_format legacy) {
+ return findValueOrDefault(getPcmFormatToAudioFormatDescMap(), legacy, AudioFormatDescription());
+}
+
+pcm_format aidl2c_AudioFormatDescription_pcm_format(const AudioFormatDescription& aidl) {
+ return findValueOrDefault(getAudioFormatDescriptorToPcmFormatMap(), aidl, PCM_FORMAT_INVALID);
+}
+
+} // namespace aidl::android::hardware::audio::core::alsa
diff --git a/audio/aidl/default/alsa/Utils.h b/audio/aidl/default/alsa/Utils.h
new file mode 100644
index 0000000..c1b9b38
--- /dev/null
+++ b/audio/aidl/default/alsa/Utils.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#pragma once
+
+#include <functional>
+#include <iostream>
+#include <memory>
+#include <optional>
+#include <vector>
+
+#include <aidl/android/media/audio/common/AudioChannelLayout.h>
+#include <aidl/android/media/audio/common/AudioFormatDescription.h>
+#include <aidl/android/media/audio/common/AudioPort.h>
+
+#include "core-impl/Stream.h"
+
+extern "C" {
+#include <tinyalsa/pcm.h>
+#include "alsa_device_profile.h"
+#include "alsa_device_proxy.h"
+}
+
+namespace aidl::android::hardware::audio::core::alsa {
+
+struct DeviceProfile {
+ int card;
+ int device;
+ int direction; /* PCM_OUT or PCM_IN */
+};
+std::ostream& operator<<(std::ostream& os, const DeviceProfile& device);
+using DeviceProxyDeleter = std::function<void(alsa_device_proxy*)>;
+using DeviceProxy = std::unique_ptr<alsa_device_proxy, DeviceProxyDeleter>;
+
+::aidl::android::media::audio::common::AudioChannelLayout getChannelLayoutMaskFromChannelCount(
+ unsigned int channelCount, int isInput);
+::aidl::android::media::audio::common::AudioChannelLayout getChannelIndexMaskFromChannelCount(
+ unsigned int channelCount);
+unsigned int getChannelCountFromChannelMask(
+ const ::aidl::android::media::audio::common::AudioChannelLayout& channelMask, bool isInput);
+std::vector<::aidl::android::media::audio::common::AudioChannelLayout> getChannelMasksFromProfile(
+ const alsa_device_profile* profile);
+std::optional<DeviceProfile> getDeviceProfile(
+ const ::aidl::android::media::audio::common::AudioDevice& audioDevice, bool isInput);
+std::optional<DeviceProfile> getDeviceProfile(
+ const ::aidl::android::media::audio::common::AudioPort& audioPort);
+std::optional<struct pcm_config> getPcmConfig(const StreamContext& context, bool isInput);
+std::vector<int> getSampleRatesFromProfile(const alsa_device_profile* profile);
+DeviceProxy makeDeviceProxy();
+std::optional<alsa_device_profile> readAlsaDeviceInfo(const DeviceProfile& deviceProfile);
+
+::aidl::android::media::audio::common::AudioFormatDescription
+c2aidl_pcm_format_AudioFormatDescription(enum pcm_format legacy);
+pcm_format aidl2c_AudioFormatDescription_pcm_format(
+ const ::aidl::android::media::audio::common::AudioFormatDescription& aidl);
+
+} // namespace aidl::android::hardware::audio::core::alsa