media/audio/fake_audio_output_stream.cc

   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_worker_(manager->GetWorkerTaskRunner(), params),
  26       audio_bus_(AudioBus::Create(params)) {
  27 }
  28
  29 FakeAudioOutputStream::~FakeAudioOutputStream() {
  30   DCHECK(!callback_);
  31 }
  32
  33 bool FakeAudioOutputStream::Open() {
  34   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
  35   audio_bus_->Zero();
  36   return true;
  37 }
  38
  39 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
  40   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
  41   callback_ = callback;
  42   fake_worker_.Start(base::Bind(
  43       &FakeAudioOutputStream::CallOnMoreData, base::Unretained(this)));
  44 }
  45
  46 void FakeAudioOutputStream::Stop() {
  47   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
  48   fake_worker_.Stop();
  49   callback_ = NULL;
  50 }
  51
  52 void FakeAudioOutputStream::Close() {
  53   DCHECK(!callback_);
  54   DCHECK(audio_manager_->GetTaskRunner()->BelongsToCurrentThread());
  55   audio_manager_->ReleaseOutputStream(this);
  56 }
  57
  58 void FakeAudioOutputStream::SetVolume(double volume) {};
  59
  60 void FakeAudioOutputStream::GetVolume(double* volume) {
  61   *volume = 0;
  62 };
  63
  64 void FakeAudioOutputStream::CallOnMoreData() {
  65   DCHECK(audio_manager_->GetWorkerTaskRunner()->BelongsToCurrentThread());
  66   callback_->OnMoreData(audio_bus_.get(), 0);
  67 }
  68
  69 }  // namespace media