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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 // THREAD SAFETY | 5 // THREAD SAFETY |
| 6 // | 6 // |
| 7 // AlsaPcmOutputStream object is *not* thread-safe -- we assume that | 7 // AlsaPcmOutputStream object is *not* thread-safe -- we assume that |
| 8 // client thread - creates the object and calls the public APIs. | 8 // client thread - creates the object and calls the public APIs. |
| 9 // message loop thread - executes all the internal tasks including querying | 9 // message loop thread - executes all the internal tasks including querying |
| 10 // the data source for more data, writing to the alsa device, and closing | 10 // the data source for more data, writing to the alsa device, and closing |
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| 36 // ALSA device, and playback will effectively stop. From the client's point of | 36 // ALSA device, and playback will effectively stop. From the client's point of |
| 37 // view, it will seem that the device has just clogged and stopped requesting | 37 // view, it will seem that the device has just clogged and stopped requesting |
| 38 // data. | 38 // data. |
| 39 | 39 |
| 40 #include "media/audio/linux/alsa_output.h" | 40 #include "media/audio/linux/alsa_output.h" |
| 41 | 41 |
| 42 #include <algorithm> | 42 #include <algorithm> |
| 43 | 43 |
| 44 #include "base/logging.h" | 44 #include "base/logging.h" |
| 45 #include "base/message_loop.h" | 45 #include "base/message_loop.h" |
| 46 #include "base/stl_util-inl.h" | 46 #include "base/stl_util.h" |
| 47 #include "base/time.h" | 47 #include "base/time.h" |
| 48 #include "media/audio/audio_util.h" | 48 #include "media/audio/audio_util.h" |
| 49 #include "media/audio/linux/alsa_util.h" | 49 #include "media/audio/linux/alsa_util.h" |
| 50 #include "media/audio/linux/alsa_wrapper.h" | 50 #include "media/audio/linux/alsa_wrapper.h" |
| 51 #include "media/audio/linux/audio_manager_linux.h" | 51 #include "media/audio/linux/audio_manager_linux.h" |
| 52 #include "media/base/data_buffer.h" | 52 #include "media/base/data_buffer.h" |
| 53 #include "media/base/seekable_buffer.h" | 53 #include "media/base/seekable_buffer.h" |
| 54 | 54 |
| 55 // Amount of time to wait if we've exhausted the data source. This is to avoid | 55 // Amount of time to wait if we've exhausted the data source. This is to avoid |
| 56 // busy looping. | 56 // busy looping. |
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| 868 source_callback_->OnError(this, code); | 868 source_callback_->OnError(this, code); |
| 869 } | 869 } |
| 870 } | 870 } |
| 871 | 871 |
| 872 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to | 872 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to |
| 873 // release ownership of the currently registered callback. | 873 // release ownership of the currently registered callback. |
| 874 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { | 874 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { |
| 875 DCHECK_EQ(MessageLoop::current(), message_loop_); | 875 DCHECK_EQ(MessageLoop::current(), message_loop_); |
| 876 source_callback_ = callback; | 876 source_callback_ = callback; |
| 877 } | 877 } |
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