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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- //
- // Creates a unified stream based on the cras (ChromeOS audio server) interface.
- //
- // CrasUnifiedStream object is *not* thread-safe and should only be used
- // from the audio thread.
- #ifndef MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_
- #define MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_
- #include <cras_client.h>
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include "base/compiler_specific.h"
- #include "media/audio/audio_io.h"
- #include "media/base/audio_parameters.h"
- namespace media {
- class AudioManagerCrasBase;
- // Implementation of AudioOuputStream for Chrome OS using the Chrome OS audio
- // server.
- // TODO(dgreid): This class is used for only output, either remove all the
- // relevant input code and change the class to CrasOutputStream or merge
- // cras_input.cc into this unified implementation.
- class MEDIA_EXPORT CrasUnifiedStream : public AudioOutputStream {
- public:
- // The ctor takes all the usual parameters, plus |manager| which is the
- // audio manager who is creating this object.
- CrasUnifiedStream(const AudioParameters& params,
- AudioManagerCrasBase* manager,
- const std::string& device_id);
- CrasUnifiedStream(const CrasUnifiedStream&) = delete;
- CrasUnifiedStream& operator=(const CrasUnifiedStream&) = delete;
- // The dtor is typically called by the AudioManager only and it is usually
- // triggered by calling AudioUnifiedStream::Close().
- ~CrasUnifiedStream() override;
- // Implementation of AudioOutputStream.
- bool Open() override;
- void Close() override;
- void Flush() override;
- void Start(AudioSourceCallback* callback) override;
- void Stop() override;
- void SetVolume(double volume) override;
- void GetVolume(double* volume) override;
- private:
- // Handles captured audio and fills the output with audio to be played.
- static int UnifiedCallback(struct libcras_stream_cb_data* data);
- // Handles notification that there was an error with the playback stream.
- static int StreamError(cras_client* client,
- cras_stream_id_t stream_id,
- int err,
- void* arg);
- // Writes audio for a playback stream.
- uint32_t WriteAudio(size_t frames,
- uint8_t* buffer,
- const timespec* latency_ts);
- // Deals with an error that occured in the stream. Called from StreamError().
- void NotifyStreamError(int err);
- // The client used to communicate with the audio server.
- struct libcras_client* client_;
- // ID of the playing stream.
- cras_stream_id_t stream_id_;
- // PCM parameters for the stream.
- AudioParameters params_;
- // True if stream is playing.
- bool is_playing_;
- // Volume level from 0.0 to 1.0.
- float volume_;
- // Audio manager that created us. Used to report that we've been closed.
- AudioManagerCrasBase* manager_;
- // Callback to get audio samples.
- AudioSourceCallback* source_callback_;
- // Container for exchanging data with AudioSourceCallback::OnMoreData().
- std::unique_ptr<AudioBus> output_bus_;
- // Direciton of the stream.
- CRAS_STREAM_DIRECTION stream_direction_;
- // Index of the CRAS device to stream output to.
- const int pin_device_;
- };
- } // namespace media
- #endif // MEDIA_AUDIO_CRAS_CRAS_UNIFIED_H_
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