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| 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/audio_output_dispatcher_impl.h" |
| 6 |
| 7 #include <algorithm> |
| 8 |
| 9 #include "base/bind.h" |
| 10 #include "base/compiler_specific.h" |
| 11 #include "base/message_loop.h" |
| 12 #include "base/time.h" |
| 13 #include "media/audio/audio_io.h" |
| 14 #include "media/audio/audio_output_proxy.h" |
| 15 #include "media/audio/audio_util.h" |
| 16 |
| 17 namespace media { |
| 18 |
| 19 AudioOutputDispatcherImpl::AudioOutputDispatcherImpl( |
| 20 AudioManager* audio_manager, |
| 21 const AudioParameters& params, |
| 22 const base::TimeDelta& close_delay) |
| 23 : AudioOutputDispatcher(audio_manager, params), |
| 24 pause_delay_(base::TimeDelta::FromMilliseconds( |
| 25 2 * params.frames_per_buffer() * |
| 26 base::Time::kMillisecondsPerSecond / params.sample_rate())), |
| 27 paused_proxies_(0), |
| 28 ALLOW_THIS_IN_INITIALIZER_LIST(weak_this_(this)), |
| 29 close_timer_(FROM_HERE, |
| 30 close_delay, |
| 31 weak_this_.GetWeakPtr(), |
| 32 &AudioOutputDispatcherImpl::ClosePendingStreams) { |
| 33 } |
| 34 |
| 35 AudioOutputDispatcherImpl::~AudioOutputDispatcherImpl() { |
| 36 DCHECK(proxy_to_physical_map_.empty()); |
| 37 DCHECK(idle_streams_.empty()); |
| 38 DCHECK(pausing_streams_.empty()); |
| 39 } |
| 40 |
| 41 bool AudioOutputDispatcherImpl::OpenStream() { |
| 42 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 43 |
| 44 paused_proxies_++; |
| 45 |
| 46 // Ensure that there is at least one open stream. |
| 47 if (idle_streams_.empty() && !CreateAndOpenStream()) |
| 48 return false; |
| 49 |
| 50 close_timer_.Reset(); |
| 51 return true; |
| 52 } |
| 53 |
| 54 bool AudioOutputDispatcherImpl::StartStream( |
| 55 AudioOutputStream::AudioSourceCallback* callback, |
| 56 AudioOutputProxy* stream_proxy) { |
| 57 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 58 |
| 59 if (idle_streams_.empty() && !CreateAndOpenStream()) |
| 60 return false; |
| 61 |
| 62 AudioOutputStream* physical_stream = idle_streams_.back(); |
| 63 DCHECK(physical_stream); |
| 64 idle_streams_.pop_back(); |
| 65 |
| 66 DCHECK_GT(paused_proxies_, 0u); |
| 67 --paused_proxies_; |
| 68 |
| 69 close_timer_.Reset(); |
| 70 |
| 71 // Schedule task to allocate streams for other proxies if we need to. |
| 72 message_loop_->PostTask(FROM_HERE, base::Bind( |
| 73 &AudioOutputDispatcherImpl::OpenTask, weak_this_.GetWeakPtr())); |
| 74 |
| 75 double volume = 0; |
| 76 stream_proxy->GetVolume(&volume); |
| 77 physical_stream->SetVolume(volume); |
| 78 physical_stream->Start(callback); |
| 79 proxy_to_physical_map_[stream_proxy] = physical_stream; |
| 80 return true; |
| 81 } |
| 82 |
| 83 void AudioOutputDispatcherImpl::StopStream(AudioOutputProxy* stream_proxy) { |
| 84 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 85 |
| 86 AudioStreamMap::iterator it = proxy_to_physical_map_.find(stream_proxy); |
| 87 DCHECK(it != proxy_to_physical_map_.end()); |
| 88 AudioOutputStream* physical_stream = it->second; |
| 89 proxy_to_physical_map_.erase(it); |
| 90 |
| 91 physical_stream->Stop(); |
| 92 |
| 93 ++paused_proxies_; |
| 94 |
| 95 pausing_streams_.push_front(physical_stream); |
| 96 |
| 97 // Don't recycle stream until two buffers worth of time has elapsed. |
| 98 message_loop_->PostDelayedTask( |
| 99 FROM_HERE, |
| 100 base::Bind(&AudioOutputDispatcherImpl::StopStreamTask, |
| 101 weak_this_.GetWeakPtr()), |
| 102 pause_delay_); |
| 103 } |
| 104 |
| 105 void AudioOutputDispatcherImpl::StreamVolumeSet(AudioOutputProxy* stream_proxy, |
| 106 double volume) { |
| 107 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 108 AudioStreamMap::iterator it = proxy_to_physical_map_.find(stream_proxy); |
| 109 if (it != proxy_to_physical_map_.end()) { |
| 110 AudioOutputStream* physical_stream = it->second; |
| 111 physical_stream->SetVolume(volume); |
| 112 } |
| 113 } |
| 114 |
| 115 void AudioOutputDispatcherImpl::StopStreamTask() { |
| 116 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 117 |
| 118 if (pausing_streams_.empty()) |
| 119 return; |
| 120 |
| 121 AudioOutputStream* stream = pausing_streams_.back(); |
| 122 pausing_streams_.pop_back(); |
| 123 idle_streams_.push_back(stream); |
| 124 close_timer_.Reset(); |
| 125 } |
| 126 |
| 127 void AudioOutputDispatcherImpl::CloseStream(AudioOutputProxy* stream_proxy) { |
| 128 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 129 |
| 130 while (!pausing_streams_.empty()) { |
| 131 idle_streams_.push_back(pausing_streams_.back()); |
| 132 pausing_streams_.pop_back(); |
| 133 } |
| 134 |
| 135 DCHECK_GT(paused_proxies_, 0u); |
| 136 paused_proxies_--; |
| 137 |
| 138 while (idle_streams_.size() > paused_proxies_) { |
| 139 idle_streams_.back()->Close(); |
| 140 idle_streams_.pop_back(); |
| 141 } |
| 142 } |
| 143 |
| 144 void AudioOutputDispatcherImpl::Shutdown() { |
| 145 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 146 |
| 147 // Cancel any pending tasks to close paused streams or create new ones. |
| 148 weak_this_.InvalidateWeakPtrs(); |
| 149 |
| 150 // No AudioOutputProxy objects should hold a reference to us when we get |
| 151 // to this stage. |
| 152 DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference"; |
| 153 |
| 154 AudioOutputStreamList::iterator it = idle_streams_.begin(); |
| 155 for (; it != idle_streams_.end(); ++it) |
| 156 (*it)->Close(); |
| 157 idle_streams_.clear(); |
| 158 |
| 159 it = pausing_streams_.begin(); |
| 160 for (; it != pausing_streams_.end(); ++it) |
| 161 (*it)->Close(); |
| 162 pausing_streams_.clear(); |
| 163 } |
| 164 |
| 165 bool AudioOutputDispatcherImpl::CreateAndOpenStream() { |
| 166 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 167 AudioOutputStream* stream = audio_manager_->MakeAudioOutputStream(params_); |
| 168 if (!stream) |
| 169 return false; |
| 170 |
| 171 if (!stream->Open()) { |
| 172 stream->Close(); |
| 173 return false; |
| 174 } |
| 175 idle_streams_.push_back(stream); |
| 176 return true; |
| 177 } |
| 178 |
| 179 void AudioOutputDispatcherImpl::OpenTask() { |
| 180 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 181 // Make sure that we have at least one stream allocated if there |
| 182 // are paused streams. |
| 183 if (paused_proxies_ > 0 && idle_streams_.empty() && |
| 184 pausing_streams_.empty()) { |
| 185 CreateAndOpenStream(); |
| 186 } |
| 187 |
| 188 close_timer_.Reset(); |
| 189 } |
| 190 |
| 191 // This method is called by |close_timer_|. |
| 192 void AudioOutputDispatcherImpl::ClosePendingStreams() { |
| 193 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 194 while (!idle_streams_.empty()) { |
| 195 idle_streams_.back()->Close(); |
| 196 idle_streams_.pop_back(); |
| 197 } |
| 198 } |
| 199 |
| 200 } // namespace media |
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