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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 a unified stream based on the cras (ChromeOS audio server) interface. | 5 // Creates a unified stream based on the cras (ChromeOS audio server) interface. |
| 6 // | 6 // |
| 7 // CrasUnifiedStream object is *not* thread-safe and should only be used | 7 // CrasUnifiedStream object is *not* thread-safe and should only be used |
| 8 // from the audio thread. | 8 // from the audio thread. |
| 9 | 9 |
| 10 #ifndef MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_ | 10 #ifndef MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_ |
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| 38 // Implementation of AudioOutputStream. | 38 // Implementation of AudioOutputStream. |
| 39 bool Open() override; | 39 bool Open() override; |
| 40 void Close() override; | 40 void Close() override; |
| 41 void Start(AudioSourceCallback* callback) override; | 41 void Start(AudioSourceCallback* callback) override; |
| 42 void Stop() override; | 42 void Stop() override; |
| 43 void SetVolume(double volume) override; | 43 void SetVolume(double volume) override; |
| 44 void GetVolume(double* volume) override; | 44 void GetVolume(double* volume) override; |
| 45 | 45 |
| 46 private: | 46 private: |
| 47 // Convert Latency in time to bytes. | 47 // Convert Latency in time to bytes. |
| 48 uint32 GetBytesLatency(const struct timespec& latency); | 48 uint32_t GetBytesLatency(const struct timespec& latency); |
| 49 | 49 |
| 50 // Handles captured audio and fills the ouput with audio to be played. | 50 // Handles captured audio and fills the ouput with audio to be played. |
| 51 static int UnifiedCallback(cras_client* client, | 51 static int UnifiedCallback(cras_client* client, |
| 52 cras_stream_id_t stream_id, | 52 cras_stream_id_t stream_id, |
| 53 uint8* input_samples, | 53 uint8_t* input_samples, |
| 54 uint8* output_samples, | 54 uint8_t* output_samples, |
| 55 unsigned int frames, | 55 unsigned int frames, |
| 56 const timespec* input_ts, | 56 const timespec* input_ts, |
| 57 const timespec* output_ts, | 57 const timespec* output_ts, |
| 58 void* arg); | 58 void* arg); |
| 59 | 59 |
| 60 // Handles notification that there was an error with the playback stream. | 60 // Handles notification that there was an error with the playback stream. |
| 61 static int StreamError(cras_client* client, | 61 static int StreamError(cras_client* client, |
| 62 cras_stream_id_t stream_id, | 62 cras_stream_id_t stream_id, |
| 63 int err, | 63 int err, |
| 64 void* arg); | 64 void* arg); |
| 65 | 65 |
| 66 // Chooses the correct audio callback based on stream direction. | 66 // Chooses the correct audio callback based on stream direction. |
| 67 uint32 DispatchCallback(size_t frames, | 67 uint32_t DispatchCallback(size_t frames, |
| 68 uint8* input_samples, | 68 uint8_t* input_samples, |
| 69 uint8* output_samples, | 69 uint8_t* output_samples, |
| 70 const timespec* input_ts, | 70 const timespec* input_ts, |
| 71 const timespec* output_ts); | 71 const timespec* output_ts); |
| 72 | 72 |
| 73 // Writes audio for a playback stream. | 73 // Writes audio for a playback stream. |
| 74 uint32 WriteAudio(size_t frames, uint8* buffer, const timespec* sample_ts); | 74 uint32_t WriteAudio(size_t frames, |
| 75 uint8_t* buffer, |
| 76 const timespec* sample_ts); |
| 75 | 77 |
| 76 // Deals with an error that occured in the stream. Called from StreamError(). | 78 // Deals with an error that occured in the stream. Called from StreamError(). |
| 77 void NotifyStreamError(int err); | 79 void NotifyStreamError(int err); |
| 78 | 80 |
| 79 // The client used to communicate with the audio server. | 81 // The client used to communicate with the audio server. |
| 80 cras_client* client_; | 82 cras_client* client_; |
| 81 | 83 |
| 82 // ID of the playing stream. | 84 // ID of the playing stream. |
| 83 cras_stream_id_t stream_id_; | 85 cras_stream_id_t stream_id_; |
| 84 | 86 |
| 85 // PCM parameters for the stream. | 87 // PCM parameters for the stream. |
| 86 AudioParameters params_; | 88 AudioParameters params_; |
| 87 | 89 |
| 88 // Size of frame in bytes. | 90 // Size of frame in bytes. |
| 89 uint32 bytes_per_frame_; | 91 uint32_t bytes_per_frame_; |
| 90 | 92 |
| 91 // True if stream is playing. | 93 // True if stream is playing. |
| 92 bool is_playing_; | 94 bool is_playing_; |
| 93 | 95 |
| 94 // Volume level from 0.0 to 1.0. | 96 // Volume level from 0.0 to 1.0. |
| 95 float volume_; | 97 float volume_; |
| 96 | 98 |
| 97 // Audio manager that created us. Used to report that we've been closed. | 99 // Audio manager that created us. Used to report that we've been closed. |
| 98 AudioManagerCras* manager_; | 100 AudioManagerCras* manager_; |
| 99 | 101 |
| 100 // Callback to get audio samples. | 102 // Callback to get audio samples. |
| 101 AudioSourceCallback* source_callback_; | 103 AudioSourceCallback* source_callback_; |
| 102 | 104 |
| 103 // Container for exchanging data with AudioSourceCallback::OnMoreData(). | 105 // Container for exchanging data with AudioSourceCallback::OnMoreData(). |
| 104 scoped_ptr<AudioBus> output_bus_; | 106 scoped_ptr<AudioBus> output_bus_; |
| 105 | 107 |
| 106 // Direciton of the stream. | 108 // Direciton of the stream. |
| 107 CRAS_STREAM_DIRECTION stream_direction_; | 109 CRAS_STREAM_DIRECTION stream_direction_; |
| 108 | 110 |
| 109 DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStream); | 111 DISALLOW_COPY_AND_ASSIGN(CrasUnifiedStream); |
| 110 }; | 112 }; |
| 111 | 113 |
| 112 } // namespace media | 114 } // namespace media |
| 113 | 115 |
| 114 #endif // MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_ | 116 #endif // MEDIA_AUDIO_LINUX_CRAS_UNIFIED_H_ |
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