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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 // Creates an output stream based on the ALSA PCM interface. | 5 // Creates an output stream based on the ALSA PCM interface. |
6 // | 6 // |
7 // On device write failure, the stream will move itself to an invalid state. | 7 // On device write failure, the stream will move itself to an invalid state. |
8 // No more data will be pulled from the data source, or written to the device. | 8 // No more data will be pulled from the data source, or written to the device. |
9 // All calls to public API functions will either no-op themselves, or return an | 9 // All calls to public API functions will either no-op themselves, or return an |
10 // error if possible. Specifically, If the stream is in an error state, Open() | 10 // error if possible. Specifically, If the stream is in an error state, Open() |
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145 InternalState state(); | 145 InternalState state(); |
146 | 146 |
147 // API for Proxying calls to the AudioSourceCallback provided during | 147 // API for Proxying calls to the AudioSourceCallback provided during |
148 // Start(). | 148 // Start(). |
149 // | 149 // |
150 // TODO(ajwong): This is necessary because the ownership semantics for the | 150 // TODO(ajwong): This is necessary because the ownership semantics for the |
151 // |source_callback_| object are incorrect in AudioRenderHost. The callback | 151 // |source_callback_| object are incorrect in AudioRenderHost. The callback |
152 // is passed into the output stream, but ownership is not transfered which | 152 // is passed into the output stream, but ownership is not transfered which |
153 // requires a synchronization on access of the |source_callback_| to avoid | 153 // requires a synchronization on access of the |source_callback_| to avoid |
154 // using a deleted callback. | 154 // using a deleted callback. |
155 int RunDataCallback(AudioBus* audio_bus, uint32_t total_bytes_delay); | 155 int RunDataCallback(base::TimeTicks target_playout_time, AudioBus* audio_bus); |
156 void RunErrorCallback(int code); | 156 void RunErrorCallback(int code); |
157 | 157 |
158 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to | 158 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to |
159 // release ownership of the currently registered callback. | 159 // release ownership of the currently registered callback. |
160 void set_source_callback(AudioSourceCallback* callback); | 160 void set_source_callback(AudioSourceCallback* callback); |
161 | 161 |
162 // Configuration constants from the constructor. Referenceable by all threads | 162 // Configuration constants from the constructor. Referenceable by all threads |
163 // since they are constants. | 163 // since they are constants. |
164 const std::string requested_device_name_; | 164 const std::string requested_device_name_; |
165 const snd_pcm_format_t pcm_format_; | 165 const snd_pcm_format_t pcm_format_; |
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215 | 215 |
216 DISALLOW_COPY_AND_ASSIGN(AlsaPcmOutputStream); | 216 DISALLOW_COPY_AND_ASSIGN(AlsaPcmOutputStream); |
217 }; | 217 }; |
218 | 218 |
219 MEDIA_EXPORT std::ostream& operator<<(std::ostream& os, | 219 MEDIA_EXPORT std::ostream& operator<<(std::ostream& os, |
220 AlsaPcmOutputStream::InternalState); | 220 AlsaPcmOutputStream::InternalState); |
221 | 221 |
222 }; // namespace media | 222 }; // namespace media |
223 | 223 |
224 #endif // MEDIA_AUDIO_ALSA_ALSA_OUTPUT_H_ | 224 #endif // MEDIA_AUDIO_ALSA_ALSA_OUTPUT_H_ |
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