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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "media/audio/audio_system_impl.h" |
| 6 |
| 7 #include "base/memory/ptr_util.h" |
| 8 #include "base/single_thread_task_runner.h" |
| 9 #include "base/task_runner_util.h" |
| 10 #include "media/audio/audio_manager.h" |
| 11 |
| 12 // Using base::Unretained for |audio_manager_| is safe since it is deleted after |
| 13 // its task runner, and AudioSystemImpl is deleted on the UI thread after the IO |
| 14 // thread has been stopped and before |audio_manager_| deletion is scheduled. |
| 15 namespace media { |
| 16 |
| 17 namespace { |
| 18 |
| 19 AudioParameters GetInputParametersOnDeviceThread(AudioManager* audio_manager, |
| 20 const std::string& device_id) { |
| 21 DCHECK(audio_manager->GetTaskRunner()->BelongsToCurrentThread()); |
| 22 |
| 23 // TODO(olka): remove this when AudioManager::GetInputStreamParameters() |
| 24 // works this way on all the platforms. |
| 25 if (!audio_manager->HasAudioInputDevices()) |
| 26 return AudioParameters(); |
| 27 |
| 28 return audio_manager->GetInputStreamParameters(device_id); |
| 29 } |
| 30 |
| 31 } // namespace |
| 32 |
| 33 AudioSystemImpl::AudioSystemImpl(AudioManager* audio_manager) |
| 34 : audio_manager_(audio_manager) { |
| 35 DCHECK(audio_manager_); |
| 36 } |
| 37 |
| 38 AudioSystemImpl::~AudioSystemImpl() {} |
| 39 |
| 40 // static |
| 41 std::unique_ptr<AudioSystem> AudioSystemImpl::Create( |
| 42 AudioManager* audio_manager) { |
| 43 return base::WrapUnique(new AudioSystemImpl(audio_manager)); |
| 44 } |
| 45 |
| 46 void AudioSystemImpl::GetInputStreamParameters( |
| 47 const std::string& device_id, |
| 48 OnAudioParamsCallback on_params_cb) const { |
| 49 if (GetTaskRunner()->BelongsToCurrentThread()) { |
| 50 GetTaskRunner()->PostTask( |
| 51 FROM_HERE, base::Bind(on_params_cb, GetInputParametersOnDeviceThread( |
| 52 audio_manager_, device_id))); |
| 53 return; |
| 54 } |
| 55 base::PostTaskAndReplyWithResult( |
| 56 GetTaskRunner(), FROM_HERE, |
| 57 base::Bind(&GetInputParametersOnDeviceThread, |
| 58 base::Unretained(audio_manager_), device_id), |
| 59 std::move(on_params_cb)); |
| 60 } |
| 61 |
| 62 AudioManager* AudioSystemImpl::GetAudioManager() const { |
| 63 return audio_manager_; |
| 64 } |
| 65 |
| 66 base::SingleThreadTaskRunner* AudioSystemImpl::GetTaskRunner() const { |
| 67 return audio_manager_->GetTaskRunner(); |
| 68 } |
| 69 |
| 70 } // namespace media |
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