1 // Copyright (C) 2021 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //      http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "AudioProxyImpl.h"
16 
17 #include <android-base/logging.h>
18 
19 #include "AudioProxyError.h"
20 
21 namespace audio_proxy::service {
22 
AudioProxyImpl()23 AudioProxyImpl::AudioProxyImpl()
24     : mDeathRecipient(
25           AIBinder_DeathRecipient_new(AudioProxyImpl::onStreamProviderDied)) {}
26 
start(const std::shared_ptr<IStreamProvider> & provider)27 ndk::ScopedAStatus AudioProxyImpl::start(
28     const std::shared_ptr<IStreamProvider>& provider) {
29   if (mBusStreamProvider.getStreamProvider()) {
30     LOG(ERROR) << "Service is already started.";
31     return ndk::ScopedAStatus::fromServiceSpecificError(
32         ERROR_STREAM_PROVIDER_EXIST);
33   }
34 
35   binder_status_t binder_status = AIBinder_linkToDeath(
36       provider->asBinder().get(), mDeathRecipient.get(), this);
37   if (binder_status != STATUS_OK) {
38     LOG(ERROR) << "Failed to linkToDeath " << static_cast<int>(binder_status);
39     return ndk::ScopedAStatus::fromServiceSpecificError(ERROR_AIDL_FAILURE);
40   }
41 
42   mBusStreamProvider.setStreamProvider(provider);
43   return ndk::ScopedAStatus::ok();
44 }
45 
getBusStreamProvider()46 BusStreamProvider& AudioProxyImpl::getBusStreamProvider() {
47   return mBusStreamProvider;
48 }
49 
resetStreamProvider()50 void AudioProxyImpl::resetStreamProvider() {
51   mBusStreamProvider.setStreamProvider(nullptr);
52 }
53 
onStreamProviderDied(void * cookie)54 void AudioProxyImpl::onStreamProviderDied(void* cookie) {
55   // AudioProxyImpl lives longer than the death handler. The reinterpret_cast
56   // here is safe.
57   auto* audioProxy = reinterpret_cast<AudioProxyImpl*>(cookie);
58   audioProxy->resetStreamProvider();
59 }
60 
61 }  // namespace audio_proxy::service
62