Peter Cai
5a38b5b333
This is needed because libaudiohal.so can only interact with one HAL version at a time (loading only one of the libaudiohal@version.so implementations), so only the interface that matches the stock HAL version will be used. libaudiohal decides which version to use by looking through the interfaces whose variant is `default` and picking the highest versioned one, so our hal will not interfere in the process (because we use `sysbta` as our variant).
93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
/*
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* Copyright (C) 2022 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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#define LOG_TAG "BtAudioAIDLServiceSystem"
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#include <dlfcn.h>
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#include <signal.h>
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#include <android/binder_manager.h>
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#include <android/binder_process.h>
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#include <utils/Log.h>
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#include <hidl/HidlTransportSupport.h>
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#include <hwbinder/ProcessState.h>
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#include <binder/ProcessState.h>
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#include "BluetoothAudioProviderFactory.h"
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using ::aidl::android::hardware::bluetooth::audio::
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BluetoothAudioProviderFactory;
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#if defined(__LP64__)
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#define HAL_LIBRARY_PATH "/system/lib64/hw"
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#else
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#define HAL_LIBRARY_PATH "/system/lib/hw"
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#endif
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void registerAudioInterfaces() {
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const char *interface_libs[] = {
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"android.hardware.audio@2.0-impl-system.so",
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"android.hardware.audio@4.0-impl-system.so",
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"android.hardware.audio@5.0-impl-system.so",
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"android.hardware.audio@6.0-impl-system.so",
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"android.hardware.audio@7.0-impl-system.so",
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"android.hardware.audio@7.1-impl-system.so",
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};
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for (auto& lib : interface_libs) {
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void* handle = dlopen((std::string() + HAL_LIBRARY_PATH + "/" + lib).c_str(), RTLD_NOW);
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if (handle == nullptr) {
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ALOGW("Failed to load %s, skipping", lib);
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continue;
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}
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::android::status_t (*entry_func)(const char*);
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entry_func = reinterpret_cast<::android::status_t (*)(const char*)>(dlsym(handle, "createIDevicesFactory"));
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if (entry_func == nullptr) {
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ALOGW("Cannot find entry symbol in %s, skipping", lib);
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continue;
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}
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::android::status_t status = entry_func("sysbta");
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ALOGW_IF(status != STATUS_OK, "Could not register sysbta for %s, status=%d", lib, status);
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}
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}
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int main() {
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signal(SIGPIPE, SIG_IGN);
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::android::hardware::configureRpcThreadpool(16, true);
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::android::ProcessState::initWithDriver("/dev/binder");
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// start a threadpool for binder / hwbinder interactions
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::android::ProcessState::self()->startThreadPool();
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::android::hardware::ProcessState::self()->startThreadPool();
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auto factory = ::ndk::SharedRefBase::make<BluetoothAudioProviderFactory>();
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const std::string instance_name =
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std::string() + BluetoothAudioProviderFactory::descriptor + "/sysbta";
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binder_status_t aidl_status = AServiceManager_addService(
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factory->asBinder().get(), instance_name.c_str());
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ALOGW_IF(aidl_status != STATUS_OK, "Could not register %s, status=%d",
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instance_name.c_str(), aidl_status);
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// We must also implement audio HAL interfaces in order to serve audio.sysbta.default.so
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// It must be served in the *same* process to access the same libbluetooth_audio_session
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registerAudioInterfaces();
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::android::hardware::joinRpcThreadpool();
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}
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