Simplified AudioOutputStream interface.

media/audio/fake_audio_output_stream.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/fake_audio_output_stream.h"
 
 #include "base/at_exit.h"
 #include "base/logging.h"
 
 bool FakeAudioOutputStream::has_created_fake_stream_ = false;
 FakeAudioOutputStream* FakeAudioOutputStream::last_fake_stream_ = NULL;
 
 // static
-AudioOutputStream* FakeAudioOutputStream::MakeFakeStream() {
+AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
+    AudioParameters params) {
   if (!has_created_fake_stream_)
     base::AtExitManager::RegisterCallback(&DestroyLastFakeStream, NULL);
   has_created_fake_stream_ = true;
 
-  FakeAudioOutputStream* new_stream = new FakeAudioOutputStream();
+  FakeAudioOutputStream* new_stream = new FakeAudioOutputStream(params);
 
   if (last_fake_stream_) {
     DCHECK(last_fake_stream_->closed_);
     delete last_fake_stream_;
   }
   last_fake_stream_ = new_stream;
 
   return new_stream;
 }
 
 // static
 FakeAudioOutputStream* FakeAudioOutputStream::GetLastFakeStream() {
   return last_fake_stream_;
 }
 
-bool FakeAudioOutputStream::Open(uint32 packet_size) {
-  if (packet_size < sizeof(int16))
+bool FakeAudioOutputStream::Open() {
+  if (packet_size_ < sizeof(int16))
     return false;
-  packet_size_ = packet_size;
   buffer_.reset(new uint8[packet_size_]);
   return true;
 }
 
 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
   callback_ = callback;
   memset(buffer_.get(), 0, packet_size_);
   callback_->OnMoreData(this, buffer_.get(), packet_size_,
                         AudioBuffersState(0, 0));
 }
 
 void FakeAudioOutputStream::Stop() {
+  callback_ = NULL;
 }
 
 void FakeAudioOutputStream::SetVolume(double volume) {
   volume_ = volume;
 }
 
 void FakeAudioOutputStream::GetVolume(double* volume) {
   *volume = volume_;
 }
 
 void FakeAudioOutputStream::Close() {
-  // Calls |callback_| only if it is valid. We don't have |callback_| if
-  // we have not yet started.
-  if (callback_) {
-    callback_->OnClose(this);
-    callback_ = NULL;
-  }
   closed_ = true;
 }
 
-FakeAudioOutputStream::FakeAudioOutputStream()
+FakeAudioOutputStream::FakeAudioOutputStream(AudioParameters params)
     : volume_(0),
       callback_(NULL),
-      packet_size_(0),
+      packet_size_(params.GetPacketSize()),
       closed_(false) {
 }
 
 FakeAudioOutputStream::~FakeAudioOutputStream() {}
 
 // static
 void FakeAudioOutputStream::DestroyLastFakeStream(void* param) {
   if (last_fake_stream_) {
     DCHECK(last_fake_stream_->closed_);
     delete last_fake_stream_;
   }
 }