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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 "media/audio/win/audio_low_latency_output_win.h" | 5 #include "media/audio/win/audio_low_latency_output_win.h" |
| 6 | 6 |
| 7 #include "base/logging.h" | 7 #include "base/logging.h" |
| 8 #include "base/memory/scoped_ptr.h" | 8 #include "base/memory/scoped_ptr.h" |
| 9 #include "base/utf_string_conversions.h" | 9 #include "base/utf_string_conversions.h" |
| 10 #include "media/audio/audio_util.h" | 10 #include "media/audio/audio_util.h" |
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| 110 } | 110 } |
| 111 | 111 |
| 112 opened_ = true; | 112 opened_ = true; |
| 113 | 113 |
| 114 return true; | 114 return true; |
| 115 } | 115 } |
| 116 | 116 |
| 117 void WASAPIAudioOutputStream::Start(AudioSourceCallback* callback) { | 117 void WASAPIAudioOutputStream::Start(AudioSourceCallback* callback) { |
| 118 DCHECK_EQ(GetCurrentThreadId(), creating_thread_id_); | 118 DCHECK_EQ(GetCurrentThreadId(), creating_thread_id_); |
| 119 DCHECK(callback); | 119 DCHECK(callback); |
| 120 DCHECK(opened_); | 120 DLOG_IF(ERROR, !opened_) << "Open() has not been called successfully"; |
| 121 | |
| 122 if (!opened_) | 121 if (!opened_) |
| 123 return; | 122 return; |
| 124 | 123 |
| 125 if (started_) | 124 if (started_) |
| 126 return; | 125 return; |
| 127 | 126 |
| 128 source_ = callback; | 127 source_ = callback; |
| 129 | 128 |
| 130 // Avoid start-up glitches by filling up the endpoint buffer with "silence" | 129 // Avoid start-up glitches by filling up the endpoint buffer with "silence" |
| 131 // before starting the stream. | 130 // before starting the stream. |
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| 586 return hr; | 585 return hr; |
| 587 | 586 |
| 588 // Get access to the IAudioRenderClient interface. This interface | 587 // Get access to the IAudioRenderClient interface. This interface |
| 589 // enables us to write output data to a rendering endpoint buffer. | 588 // enables us to write output data to a rendering endpoint buffer. |
| 590 // The methods in this interface manage the movement of data packets | 589 // The methods in this interface manage the movement of data packets |
| 591 // that contain audio-rendering data. | 590 // that contain audio-rendering data. |
| 592 hr = audio_client_->GetService(__uuidof(IAudioRenderClient), | 591 hr = audio_client_->GetService(__uuidof(IAudioRenderClient), |
| 593 audio_render_client_.ReceiveVoid()); | 592 audio_render_client_.ReceiveVoid()); |
| 594 return hr; | 593 return hr; |
| 595 } | 594 } |
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