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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_ |
| 6 #define CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_ |
| 7 |
| 8 #include "cast_audio_output_stream.h" |
| 9 |
| 10 namespace chromecast { |
| 11 |
| 12 class TaskRunner; |
| 13 |
| 14 namespace media { |
| 15 |
| 16 // This is an interface used to provide platform-specific audio streams. |
| 17 // Implementations of this interface should survive for the duration of the |
| 18 // process. |
| 19 |
| 20 // Note: This interface should be implemented by third parties seeking to |
| 21 // provide an audio manager platform for Cast. CastAudioManager will call |
| 22 // this interface. |
| 23 |
| 24 class CastAudioOutputDevice { |
| 25 public: |
| 26 virtual ~CastAudioOutputDevice() {} |
| 27 |
| 28 // Returns the maximum number of output streams allowed. |
| 29 virtual int GetMaximumOutputStreamsAllowed() = 0; |
| 30 |
| 31 // Returns the preferred output stream parameters. The caller may inject |
| 32 // |suggested| parameters, but it is left to the implementation to decide |
| 33 // which of these to return. |
| 34 virtual AudioParameters GetPreferredOutputStreamParameters( |
| 35 const AudioParameters& suggested) = 0; |
| 36 |
| 37 // Creates the output stream with parameters described by |params|. The stream |
| 38 // should be created on the thread on which this is called. Caller does not |
| 39 // take ownership of the returned stream. All callbacks to |
| 40 // CastAudioOutputStream::AudioSourceCallback objects should be made on the |
| 41 // thread to which |task_runner| belongs. |
| 42 virtual CastAudioOutputStream* MakeOutputStream(const AudioParameters& params, |
| 43 TaskRunner* task_runner) = 0; |
| 44 }; |
| 45 |
| 46 } // namespace media |
| 47 } // namespace chromecast |
| 48 |
| 49 #endif // CHROMECAST_PUBLIC_CAST_AUDIO_OUTPUT_DEVICE_H_ |
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