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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 // THREAD SAFETY | 5 // THREAD SAFETY |
6 // | 6 // |
7 // AlsaPcmOutputStream object is *not* thread-safe and should only be used | 7 // AlsaPcmOutputStream object is *not* thread-safe and should only be used |
8 // from the audio thread. We DCHECK on this assumption whenever we can. | 8 // from the audio thread. We DCHECK on this assumption whenever we can. |
9 // | 9 // |
10 // SEMANTICS OF Close() | 10 // SEMANTICS OF Close() |
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32 // view, it will seem that the device has just clogged and stopped requesting | 32 // view, it will seem that the device has just clogged and stopped requesting |
33 // data. | 33 // data. |
34 | 34 |
35 #include "media/audio/alsa/alsa_output.h" | 35 #include "media/audio/alsa/alsa_output.h" |
36 | 36 |
37 #include <algorithm> | 37 #include <algorithm> |
38 | 38 |
39 #include "base/bind.h" | 39 #include "base/bind.h" |
40 #include "base/debug/trace_event.h" | 40 #include "base/debug/trace_event.h" |
41 #include "base/logging.h" | 41 #include "base/logging.h" |
42 #include "base/message_loop/message_loop.h" | |
43 #include "base/stl_util.h" | 42 #include "base/stl_util.h" |
44 #include "base/time/time.h" | 43 #include "base/time/time.h" |
45 #include "media/audio/alsa/alsa_util.h" | 44 #include "media/audio/alsa/alsa_util.h" |
46 #include "media/audio/alsa/alsa_wrapper.h" | 45 #include "media/audio/alsa/alsa_wrapper.h" |
47 #include "media/audio/alsa/audio_manager_alsa.h" | 46 #include "media/audio/alsa/audio_manager_alsa.h" |
48 #include "media/base/channel_mixer.h" | 47 #include "media/base/channel_mixer.h" |
49 #include "media/base/data_buffer.h" | 48 #include "media/base/data_buffer.h" |
50 #include "media/base/seekable_buffer.h" | 49 #include "media/base/seekable_buffer.h" |
51 | 50 |
52 namespace media { | 51 namespace media { |
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152 wrapper_(wrapper), | 151 wrapper_(wrapper), |
153 manager_(manager), | 152 manager_(manager), |
154 message_loop_(base::MessageLoop::current()), | 153 message_loop_(base::MessageLoop::current()), |
155 playback_handle_(NULL), | 154 playback_handle_(NULL), |
156 frames_per_packet_(packet_size_ / bytes_per_frame_), | 155 frames_per_packet_(packet_size_ / bytes_per_frame_), |
157 weak_factory_(this), | 156 weak_factory_(this), |
158 state_(kCreated), | 157 state_(kCreated), |
159 volume_(1.0f), | 158 volume_(1.0f), |
160 source_callback_(NULL), | 159 source_callback_(NULL), |
161 audio_bus_(AudioBus::Create(params)) { | 160 audio_bus_(AudioBus::Create(params)) { |
162 DCHECK(manager_->GetMessageLoop()->BelongsToCurrentThread()); | 161 DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread()); |
163 DCHECK_EQ(audio_bus_->frames() * bytes_per_frame_, packet_size_); | 162 DCHECK_EQ(audio_bus_->frames() * bytes_per_frame_, packet_size_); |
164 | 163 |
165 // Sanity check input values. | 164 // Sanity check input values. |
166 if (!params.IsValid()) { | 165 if (!params.IsValid()) { |
167 LOG(WARNING) << "Unsupported audio parameters."; | 166 LOG(WARNING) << "Unsupported audio parameters."; |
168 TransitionTo(kInError); | 167 TransitionTo(kInError); |
169 } | 168 } |
170 | 169 |
171 if (pcm_format_ == SND_PCM_FORMAT_UNKNOWN) { | 170 if (pcm_format_ == SND_PCM_FORMAT_UNKNOWN) { |
172 LOG(WARNING) << "Unsupported bits per sample: " << params.bits_per_sample(); | 171 LOG(WARNING) << "Unsupported bits per sample: " << params.bits_per_sample(); |
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756 } | 755 } |
757 | 756 |
758 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to | 757 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to |
759 // release ownership of the currently registered callback. | 758 // release ownership of the currently registered callback. |
760 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { | 759 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { |
761 DCHECK(IsOnAudioThread()); | 760 DCHECK(IsOnAudioThread()); |
762 source_callback_ = callback; | 761 source_callback_ = callback; |
763 } | 762 } |
764 | 763 |
765 } // namespace media | 764 } // namespace media |
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