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      1 // Copyright (c) 2012 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/fake_audio_output_stream.h"
      6 
      7 #include "base/bind.h"
      8 #include "base/bind_helpers.h"
      9 #include "base/logging.h"
     10 #include "base/single_thread_task_runner.h"
     11 #include "media/audio/audio_manager_base.h"
     12 
     13 namespace media {
     14 
     15 // static
     16 AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
     17     AudioManagerBase* manager, const AudioParameters& params) {
     18   return new FakeAudioOutputStream(manager, params);
     19 }
     20 
     21 FakeAudioOutputStream::FakeAudioOutputStream(AudioManagerBase* manager,
     22                                              const AudioParameters& params)
     23     : audio_manager_(manager),
     24       callback_(NULL),
     25       fake_consumer_(manager->GetWorkerTaskRunner(), params) {
     26 }
     27 
     28 FakeAudioOutputStream::~FakeAudioOutputStream() {
     29   DCHECK(!callback_);
     30 }
     31 
     32 bool FakeAudioOutputStream::Open() {
     33   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
     34   return true;
     35 }
     36 
     37 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
     38   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
     39   callback_ = callback;
     40   fake_consumer_.Start(base::Bind(
     41       &FakeAudioOutputStream::CallOnMoreData, base::Unretained(this)));
     42 }
     43 
     44 void FakeAudioOutputStream::Stop() {
     45   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
     46   fake_consumer_.Stop();
     47   callback_ = NULL;
     48 }
     49 
     50 void FakeAudioOutputStream::Close() {
     51   DCHECK(!callback_);
     52   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
     53   audio_manager_->ReleaseOutputStream(this);
     54 }
     55 
     56 void FakeAudioOutputStream::SetVolume(double volume) {};
     57 
     58 void FakeAudioOutputStream::GetVolume(double* volume) {
     59   *volume = 0;
     60 };
     61 
     62 void FakeAudioOutputStream::CallOnMoreData(AudioBus* audio_bus) {
     63   DCHECK(audio_manager_->GetWorkerTaskRunner()->BelongsToCurrentThread());
     64   callback_->OnMoreData(audio_bus, AudioBuffersState());
     65 }
     66 
     67 }  // namespace media
     68