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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "content/renderer/pepper/pepper_platform_audio_output_impl.h" | 5 #include "content/renderer/pepper/pepper_platform_audio_output_impl.h" |
6 | 6 |
7 #include "base/bind.h" | 7 #include "base/bind.h" |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "base/message_loop_proxy.h" | 9 #include "base/message_loop_proxy.h" |
10 #include "build/build_config.h" | 10 #include "build/build_config.h" |
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113 int sample_rate, | 113 int sample_rate, |
114 int frames_per_buffer, | 114 int frames_per_buffer, |
115 webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) { | 115 webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) { |
116 DCHECK(client); | 116 DCHECK(client); |
117 // Make sure we don't call init more than once. | 117 // Make sure we don't call init more than once. |
118 DCHECK_EQ(0, stream_id_); | 118 DCHECK_EQ(0, stream_id_); |
119 | 119 |
120 client_ = client; | 120 client_ = client; |
121 | 121 |
122 media::AudioParameters::Format format; | 122 media::AudioParameters::Format format; |
123 #if defined(OS_WIN) | |
124 // For Chrome 21 on Windows, avoid the low-latency (WASAPI) path for the sake | |
125 // of Pepper Flash. Currently, the WASAPI path will fail silently for, e.g., | |
126 // 5.1/7.1 sound. (Flash always requests 44.1 kHz anyways, so it's already | |
127 // using the non-low-latency (wave-out) path on any system that's configured | |
128 // for 48 kHz.) | |
129 format = media::AudioParameters::AUDIO_PCM_LINEAR; | |
130 #else | |
131 const int kMaxFramesForLowLatency = 2400; | 123 const int kMaxFramesForLowLatency = 2400; |
132 // Use the low latency back end if the client request is compatible, and | 124 // Use the low latency back end if the client request is compatible, and |
133 // the sample count is low enough to justify using AUDIO_PCM_LOW_LATENCY. | 125 // the sample count is low enough to justify using AUDIO_PCM_LOW_LATENCY. |
134 if (sample_rate == audio_hardware::GetOutputSampleRate() && | 126 if (sample_rate == audio_hardware::GetOutputSampleRate() && |
135 frames_per_buffer <= kMaxFramesForLowLatency && | 127 frames_per_buffer <= kMaxFramesForLowLatency && |
136 frames_per_buffer % audio_hardware::GetOutputBufferSize() == 0) { | 128 frames_per_buffer % audio_hardware::GetOutputBufferSize() == 0) { |
137 format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY; | 129 format = media::AudioParameters::AUDIO_PCM_LOW_LATENCY; |
138 } else { | 130 } else { |
139 format = media::AudioParameters::AUDIO_PCM_LINEAR; | 131 format = media::AudioParameters::AUDIO_PCM_LINEAR; |
140 } | 132 } |
141 #endif | |
142 | 133 |
143 media::AudioParameters params(format, CHANNEL_LAYOUT_STEREO, sample_rate, 16, | 134 media::AudioParameters params(format, CHANNEL_LAYOUT_STEREO, sample_rate, 16, |
144 frames_per_buffer); | 135 frames_per_buffer); |
145 | 136 |
146 ChildProcess::current()->io_message_loop()->PostTask( | 137 ChildProcess::current()->io_message_loop()->PostTask( |
147 FROM_HERE, | 138 FROM_HERE, |
148 base::Bind(&PepperPlatformAudioOutputImpl::InitializeOnIOThread, | 139 base::Bind(&PepperPlatformAudioOutputImpl::InitializeOnIOThread, |
149 this, params)); | 140 this, params)); |
150 return true; | 141 return true; |
151 } | 142 } |
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173 | 164 |
174 ipc_->CloseStream(stream_id_); | 165 ipc_->CloseStream(stream_id_); |
175 ipc_->RemoveDelegate(stream_id_); | 166 ipc_->RemoveDelegate(stream_id_); |
176 stream_id_ = 0; | 167 stream_id_ = 0; |
177 | 168 |
178 Release(); // Release for the delegate, balances out the reference taken in | 169 Release(); // Release for the delegate, balances out the reference taken in |
179 // PepperPluginDelegateImpl::CreateAudio. | 170 // PepperPluginDelegateImpl::CreateAudio. |
180 } | 171 } |
181 | 172 |
182 } // namespace content | 173 } // namespace content |
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