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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 "media/audio/win/waveout_output_win.h" | 5 #include "media/audio/win/waveout_output_win.h" |
6 | 6 |
7 #include <windows.h> | 7 #include <windows.h> |
8 #include <mmsystem.h> | 8 #include <mmsystem.h> |
9 #pragma comment(lib, "winmm.lib") | 9 #pragma comment(lib, "winmm.lib") |
10 | 10 |
11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
12 #include "base/debug/trace_event.h" | 12 #include "base/debug/trace_event.h" |
13 #include "base/logging.h" | 13 #include "base/logging.h" |
14 #include "base/message_loop_proxy.h" | |
15 #include "base/threading/platform_thread.h" | |
14 #include "media/audio/audio_io.h" | 16 #include "media/audio/audio_io.h" |
15 #include "media/audio/audio_util.h" | 17 #include "media/audio/audio_util.h" |
16 #include "media/audio/win/audio_manager_win.h" | 18 #include "media/audio/win/audio_manager_win.h" |
17 | 19 |
18 namespace media { | 20 namespace media { |
19 | 21 |
20 // Some general thoughts about the waveOut API which is badly documented : | 22 // Some general thoughts about the waveOut API which is badly documented : |
21 // - We use CALLBACK_EVENT mode in which XP signals events such as buffer | 23 // - We use CALLBACK_EVENT mode in which XP signals events such as buffer |
22 // releases. | 24 // releases. |
23 // - We use RegisterWaitForSingleObject() so one of threads in thread pool | 25 // - We use RegisterWaitForSingleObject() so one of threads in thread pool |
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101 format_.Format.wBitsPerSample) / 8; | 103 format_.Format.wBitsPerSample) / 8; |
102 format_.Format.nAvgBytesPerSec = format_.Format.nBlockAlign * | 104 format_.Format.nAvgBytesPerSec = format_.Format.nBlockAlign * |
103 format_.Format.nSamplesPerSec; | 105 format_.Format.nSamplesPerSec; |
104 if (params.channels() > kMaxChannelsToMask) { | 106 if (params.channels() > kMaxChannelsToMask) { |
105 format_.dwChannelMask = kChannelsToMask[kMaxChannelsToMask]; | 107 format_.dwChannelMask = kChannelsToMask[kMaxChannelsToMask]; |
106 } else { | 108 } else { |
107 format_.dwChannelMask = kChannelsToMask[params.channels()]; | 109 format_.dwChannelMask = kChannelsToMask[params.channels()]; |
108 } | 110 } |
109 format_.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; | 111 format_.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; |
110 format_.Samples.wValidBitsPerSample = params.bits_per_sample(); | 112 format_.Samples.wValidBitsPerSample = params.bits_per_sample(); |
113 | |
114 // Boost thread priority. Required for glitch free background audio. | |
scherkus (not reviewing)
2012/11/30 22:13:34
which thread is this?
the OS callback thread or a
henrika (OOO until Aug 14)
2012/12/03 08:35:43
Same question as Andrew.
DaleCurtis
2012/12/03 18:11:06
Henrik, please see the old messages for full discu
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115 DCHECK(manager_->GetMessageLoop()->BelongsToCurrentThread()); | |
116 base::PlatformThread::SetThreadPriority( | |
117 GetCurrentThread(), base::kThreadPriority_RealtimeAudio); | |
111 } | 118 } |
112 | 119 |
113 PCMWaveOutAudioOutputStream::~PCMWaveOutAudioOutputStream() { | 120 PCMWaveOutAudioOutputStream::~PCMWaveOutAudioOutputStream() { |
114 DCHECK(NULL == waveout_); | 121 DCHECK(NULL == waveout_); |
115 } | 122 } |
116 | 123 |
117 bool PCMWaveOutAudioOutputStream::Open() { | 124 bool PCMWaveOutAudioOutputStream::Open() { |
118 if (state_ != PCMA_BRAND_NEW) | 125 if (state_ != PCMA_BRAND_NEW) |
119 return false; | 126 return false; |
120 if (BufferSize() * num_buffers_ > kMaxOpenBufferSize) | 127 if (BufferSize() * num_buffers_ > kMaxOpenBufferSize) |
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413 buffer, | 420 buffer, |
414 sizeof(WAVEHDR)); | 421 sizeof(WAVEHDR)); |
415 if (result != MMSYSERR_NOERROR) | 422 if (result != MMSYSERR_NOERROR) |
416 stream->HandleError(result); | 423 stream->HandleError(result); |
417 stream->pending_bytes_ += buffer->dwBufferLength; | 424 stream->pending_bytes_ += buffer->dwBufferLength; |
418 } | 425 } |
419 } | 426 } |
420 } | 427 } |
421 | 428 |
422 } // namespace media | 429 } // namespace media |
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