Audio software mixer.

media/audio/audio_output_dispatcher.cc

 // Copyright (c) 2012 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/audio_output_dispatcher.h"
 
-#include "base/bind.h"
-#include "base/compiler_specific.h"
 #include "base/message_loop.h"
-#include "base/time.h"
-#include "media/audio/audio_io.h"
 
 namespace media {
 
 AudioOutputDispatcher::AudioOutputDispatcher(
-    AudioManager* audio_manager, const AudioParameters& params,
-    base::TimeDelta close_delay)
+    AudioManager* audio_manager,
+    const AudioParameters& params)
     : audio_manager_(audio_manager),
       message_loop_(MessageLoop::current()),
-      params_(params),
-      pause_delay_(base::TimeDelta::FromMilliseconds(
-          2 * params.frames_per_buffer() *
-          base::Time::kMillisecondsPerSecond / params.sample_rate())),
-      paused_proxies_(0),
-      ALLOW_THIS_IN_INITIALIZER_LIST(weak_this_(this)),
-      close_timer_(FROM_HERE,
-          close_delay,
-          weak_this_.GetWeakPtr(),
-          &AudioOutputDispatcher::ClosePendingStreams) {
+      params_(params) {
   // We expect to be instantiated on the audio thread.  Otherwise the
   // message_loop_ member will point to the wrong message loop!
   DCHECK(audio_manager->GetMessageLoop()->BelongsToCurrentThread());
 }
 
 AudioOutputDispatcher::~AudioOutputDispatcher() {
   DCHECK_EQ(MessageLoop::current(), message_loop_);
 }
 
-bool AudioOutputDispatcher::StreamOpened() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-  paused_proxies_++;
-
-  // Ensure that there is at least one open stream.
-  if (idle_streams_.empty() && !CreateAndOpenStream()) {
-    return false;
-  }
-
-  close_timer_.Reset();
-
-  return true;
-}
-
-AudioOutputStream* AudioOutputDispatcher::StreamStarted() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  if (idle_streams_.empty() && !CreateAndOpenStream()) {
-    return NULL;
-  }
-
-  AudioOutputStream* stream = idle_streams_.back();
-  idle_streams_.pop_back();
-
-  DCHECK_GT(paused_proxies_, 0u);
-  paused_proxies_--;
-
-  close_timer_.Reset();
-
-  // Schedule task to allocate streams for other proxies if we need to.
-  message_loop_->PostTask(FROM_HERE, base::Bind(
-      &AudioOutputDispatcher::OpenTask, weak_this_.GetWeakPtr()));
-
-  return stream;
-}
-
-void AudioOutputDispatcher::StreamStopped(AudioOutputStream* stream) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  paused_proxies_++;
-
-  pausing_streams_.push_front(stream);
-
-  // Don't recycle stream until two buffers worth of time has elapsed.
-  message_loop_->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&AudioOutputDispatcher::StopStreamTask,
-                 weak_this_.GetWeakPtr()),
-      pause_delay_);
-}
-
-void AudioOutputDispatcher::StopStreamTask() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  if (pausing_streams_.empty())
-    return;
-
-  AudioOutputStream* stream = pausing_streams_.back();
-  pausing_streams_.pop_back();
-  idle_streams_.push_back(stream);
-  close_timer_.Reset();
-}
-
-void AudioOutputDispatcher::StreamClosed() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  while (!pausing_streams_.empty()) {
-    idle_streams_.push_back(pausing_streams_.back());
-    pausing_streams_.pop_back();
-  }
-
-  DCHECK_GT(paused_proxies_, 0u);
-  paused_proxies_--;
-
-  while (idle_streams_.size() > paused_proxies_) {
-    idle_streams_.back()->Close();
-    idle_streams_.pop_back();
-  }
-}
-
-void AudioOutputDispatcher::Shutdown() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  // Cancel any pending tasks to close paused streams or create new ones.
-  weak_this_.InvalidateWeakPtrs();
-
-  // No AudioOutputProxy objects should hold a reference to us when we get
-  // to this stage.
-  DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference";
-
-  AudioOutputStreamList::iterator it = idle_streams_.begin();
-  for (; it != idle_streams_.end(); ++it)
-    (*it)->Close();
-  idle_streams_.clear();
-
-  it = pausing_streams_.begin();
-  for (; it != pausing_streams_.end(); ++it)
-    (*it)->Close();
-  pausing_streams_.clear();
-}
-
-bool AudioOutputDispatcher::CreateAndOpenStream() {
-  AudioOutputStream* stream = audio_manager_->MakeAudioOutputStream(params_);
-  if (!stream)
-    return false;
-
-  if (!stream->Open()) {
-    stream->Close();
-    return false;
-  }
-  idle_streams_.push_back(stream);
-  return true;
-}
-
-void AudioOutputDispatcher::OpenTask() {
-  // Make sure that we have at least one stream allocated if there
-  // are paused streams.
-  if (paused_proxies_ > 0 && idle_streams_.empty() &&
-      pausing_streams_.empty()) {
-    CreateAndOpenStream();
-  }
-
-  close_timer_.Reset();
-}
-
-// This method is called by |close_timer_|.
-void AudioOutputDispatcher::ClosePendingStreams() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
-
-  while (!idle_streams_.empty()) {
-    idle_streams_.back()->Close();
-    idle_streams_.pop_back();
-  }
-}
-
 }  // namespace media