Index: media/audio/audio_output_dispatcher.cc |
diff --git a/media/audio/audio_output_dispatcher.cc b/media/audio/audio_output_dispatcher.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c861d559c5821720980e554faaa9f04b9497e948 |
--- /dev/null |
+++ b/media/audio/audio_output_dispatcher.cc |
@@ -0,0 +1,181 @@ |
+// 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/audio_output_dispatcher.h" |
+ |
+#include "base/message_loop.h" |
+#include "media/audio/audio_io.h" |
+ |
+namespace { |
+// Delay in milliseconds after since the stream is paused untill the |
scherkus (not reviewing)
2010/11/22 06:43:15
untill -> until
Sergey Ulanov
2010/11/23 19:51:46
Done.
|
+// audio device is closed. |
+const int kStreamCloseDelayMs = 5000; |
+} // namespace |
+ |
+AudioOutputDispatcher::AudioOutputDispatcher( |
+ AudioManager* audio_manager, const AudioParameters& params) |
+ : audio_manager_(audio_manager), |
+ message_loop_(audio_manager->GetMessageLoop()), |
+ params_(params), |
+ close_delay_(base::TimeDelta::FromMilliseconds( |
+ kStreamCloseDelayMs)), |
+ paused_proxies_(0), |
+ last_activity_time_(base::Time::Now()), |
+ close_task_scheduled_(false) { |
+} |
+ |
+AudioOutputDispatcher::~AudioOutputDispatcher() { |
+} |
+ |
+bool AudioOutputDispatcher::StreamOpened() { |
+ DCHECK_EQ(MessageLoop::current(), message_loop_); |
+ paused_proxies_++; |
scherkus (not reviewing)
2010/11/22 06:43:15
I'm not really sure what this variable is tracking
Sergey Ulanov
2010/11/23 19:51:46
Number of streams that are currently paused.
|
+ last_activity_time_ = base::Time::Now(); |
+ |
+ // Ensure that there is at least one open stream. |
scherkus (not reviewing)
2010/11/22 06:43:15
out of curiosity do we need to have an open stream
Sergey Ulanov
2010/11/23 19:51:46
It is just so that a page that created media eleme
|
+ if (streams_.size() == 0) { |
+ AudioOutputStream* stream = CreateAndOpenStream(); |
+ if (!stream) { |
+ return false; |
+ } |
+ streams_.push_back(stream); |
+ } |
+ |
+ // Schedule close task so that the stream is closed later if it is |
+ // not used. |
+ ScheduleCloseTask(); |
+ |
+ return true; |
+} |
+ |
+AudioOutputStream* AudioOutputDispatcher::StreamStarted() { |
scherkus (not reviewing)
2010/11/22 06:43:15
so to help me understand... ownership is passed ba
Sergey Ulanov
2010/11/23 19:51:46
Yes. Added more comments about it in .h
|
+ DCHECK_EQ(MessageLoop::current(), message_loop_); |
+ AudioOutputStream* stream; |
+ if (streams_.size() == 0) { |
+ stream = CreateAndOpenStream(); |
scherkus (not reviewing)
2010/11/22 06:43:15
you might be able to de-duplicate this + StreamOpe
Sergey Ulanov
2010/11/23 19:51:46
Good catch. Fixed!
|
+ if (!stream) { |
+ return NULL; |
+ } |
+ } else { |
+ stream = streams_.back(); |
+ streams_.pop_back(); |
+ } |
+ |
+ paused_proxies_--; |
+ DCHECK_GE(paused_proxies_, 0); |
+ |
+ last_activity_time_ = base::Time::Now(); |
+ |
+ // Schedule task to allocate streams for other proxies if we need to. |
+ message_loop_->PostTask(FROM_HERE, NewRunnableMethod( |
+ this, &AudioOutputDispatcher::OpenTask)); |
+ |
+ return stream; |
+} |
+ |
+void AudioOutputDispatcher::StreamStopped(AudioOutputStream* stream) { |
+ DCHECK_EQ(MessageLoop::current(), message_loop_); |
+ paused_proxies_++; |
+ streams_.push_back(stream); |
+ last_activity_time_ = base::Time::Now(); |
+ ScheduleCloseTask(); |
+} |
+ |
+void AudioOutputDispatcher::StreamClosed() { |
+ DCHECK_EQ(MessageLoop::current(), message_loop_); |
+ paused_proxies_--; |
+ DCHECK_GE(paused_proxies_, 0); |
+ ClosePendingStreams(); |
+} |
+ |
+MessageLoop* AudioOutputDispatcher::message_loop() { |
+ return message_loop_; |
+} |
+ |
+AudioOutputStream* AudioOutputDispatcher::CreateAndOpenStream() { |
+ AudioOutputStream* stream = |
+ audio_manager_->MakeAudioOutputStream(params_); |
+ if (!stream) { |
+ return NULL; |
+ } |
+ if (!stream->Open()) { |
+ stream->Close(); |
+ return NULL;; |
+ } |
+ return stream; |
+} |
+ |
+void AudioOutputDispatcher::OpenTask() { |
+ base::TimeDelta last_activity_delay = |
+ base::Time::Now() - last_activity_time_; |
+ |
+ if (last_activity_delay < close_delay_) { |
+ // Make sure that we have at least one stream allocated if there |
+ // are paused streams. |
+ if (paused_proxies_ > 0 && streams_.size() == 0) { |
+ AudioOutputStream* stream = CreateAndOpenStream(); |
+ if (stream) { |
+ streams_.push_back(stream); |
+ } |
+ } |
+ } |
+ |
+ // Schedule close task, so that the stream is closed if it is not |
+ // used. |
+ ScheduleCloseTask(); |
+} |
+ |
+void AudioOutputDispatcher::CloseTask() { |
+ close_task_scheduled_ = false; |
+ ClosePendingStreams(); |
+} |
+ |
+void AudioOutputDispatcher::ClosePendingStreams() { |
+ bool delay_expired = (base::Time::Now() - last_activity_time_) >= |
+ close_delay_; |
+ |
+ // We never need to have more than |paused_proxies_| streams. |
+ int max_pending_streams = paused_proxies_; |
scherkus (not reviewing)
2010/11/22 06:43:15
nit: remove one space between = and paused_proxies
Sergey Ulanov
2010/11/23 19:51:46
Done.
|
+ |
+ if (delay_expired) { |
+ // Enough time has expired since the last activity. Close all |
+ // pending streams. |
+ max_pending_streams = 0; |
+ } |
+ |
+ // Close streams we don't need anymore. |
+ while (static_cast<int>(streams_.size()) > max_pending_streams) { |
+ streams_.back()->Close(); |
+ streams_.pop_back(); |
+ } |
+ |
+ if (!delay_expired && streams_.size() > 0) { |
+ ScheduleCloseTask(); |
+ } |
+} |
+ |
+void AudioOutputDispatcher::ScheduleCloseTask() { |
+ if (close_task_scheduled_) { |
scherkus (not reviewing)
2010/11/22 06:43:15
nit: DCHECK for the message loop
Sergey Ulanov
2010/11/23 19:51:46
Done.
|
+ // There is a pending task. Don't schedule another one. |
+ return; |
+ } |
+ |
+ base::TimeDelta last_activity_delay = |
+ base::Time::Now() - last_activity_time_; |
+ int64 next_task_delay_ms = |
+ (close_delay_ - last_activity_delay).InMillisecondsRoundedUp(); |
+ if (next_task_delay_ms <= 0) |
+ next_task_delay_ms = 0; |
+ |
+ message_loop_->PostDelayedTask( |
+ FROM_HERE, |
+ NewRunnableMethod(this, &AudioOutputDispatcher::CloseTask), |
+ next_task_delay_ms); |
+ |
+ close_task_scheduled_ = true; |
+} |
+ |
+void AudioOutputDispatcher::set_close_delay(base::TimeDelta delay) { |
+ close_delay_ = delay; |
+} |