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/message_loop/message_loop.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->GetWorkerLoop(), params) {
  26 }
  27
  28 FakeAudioOutputStream::~FakeAudioOutputStream() {
  29   DCHECK(!callback_);
  30 }
  31
  32 bool FakeAudioOutputStream::Open() {
  33   DCHECK(audio_manager_->GetMessageLoop()->BelongsToCurrentThread());
  34   return true;
  35 }
  36
  37 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
  38   DCHECK(audio_manager_->GetMessageLoop()->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_->GetMessageLoop()->BelongsToCurrentThread());
  46   fake_consumer_.Stop();
  47   callback_ = NULL;
  48 }
  49
  50 void FakeAudioOutputStream::Close() {
  51   DCHECK(!callback_);
  52   DCHECK(audio_manager_->GetMessageLoop()->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_->GetWorkerLoop()->BelongsToCurrentThread());
  64   callback_->OnMoreData(audio_bus, AudioBuffersState());
  65 }
  66
  67 }  // namespace media