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head/www/qt5-webengine/files/sndio_output.h
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// Copyright (c) 2012 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. | |||||
#ifndef MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_ | |||||
#define MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_ | |||||
#include <pthread.h> | |||||
#include <sndio.h> | |||||
#include "base/time/tick_clock.h" | |||||
#include "base/time/time.h" | |||||
#include "media/audio/audio_io.h" | |||||
namespace media { | |||||
class AudioParameters; | |||||
class AudioManagerBase; | |||||
// call-backs invoked from C libraries, thus requiring C linkage | |||||
extern "C" { | |||||
// Invoked (on the real-time thread) at each sound card clock tick | |||||
void sndio_onmove(void *arg, int delta); | |||||
// Invoked (on the real-time thread) whenever the volume changes | |||||
void sndio_onvol(void *arg, unsigned int vol); | |||||
// Real-time thread entry point | |||||
void *sndio_threadstart(void *arg); | |||||
} | |||||
// Implementation of AudioOutputStream using sndio(7) | |||||
class SndioAudioOutputStream : public AudioOutputStream { | |||||
public: | |||||
// The manager is creating this object | |||||
SndioAudioOutputStream(const AudioParameters& params, | |||||
AudioManagerBase* manager); | |||||
virtual ~SndioAudioOutputStream(); | |||||
// Implementation of AudioOutputStream. | |||||
virtual bool Open() override; | |||||
virtual void Close() override; | |||||
virtual void Start(AudioSourceCallback* callback) override; | |||||
virtual void Stop() override; | |||||
virtual void SetVolume(double volume) override; | |||||
virtual void GetVolume(double* volume) override; | |||||
// C-linkage call-backs are friends to access private data | |||||
friend void sndio_onmove(void *arg, int delta); | |||||
friend void sndio_onvol(void *arg, unsigned int vol); | |||||
friend void *sndio_threadstart(void *arg); | |||||
private: | |||||
enum StreamState { | |||||
kClosed, // Not opened yet | |||||
kStopped, // Device opened, but not started yet | |||||
kRunning, // Started, device playing | |||||
kStopWait // Stopping, waiting for the real-time thread to exit | |||||
}; | |||||
// Continuously moves data from the audio bus to the device | |||||
void RealTimeThread(void); | |||||
// Our creator, the audio manager needs to be notified when we close. | |||||
AudioManagerBase* manager; | |||||
// Parameters of the source | |||||
AudioParameters params; | |||||
// Source stores data here | |||||
std::unique_ptr<AudioBus> audio_bus; | |||||
int bytes_per_frame; | |||||
// Call-back that produces data to play | |||||
AudioSourceCallback* source; | |||||
// Handle of the audio device | |||||
struct sio_hdl* hdl; | |||||
// Current state of the stream | |||||
enum StreamState state; | |||||
// High priority thread running RealTimeThread() | |||||
pthread_t thread; | |||||
// Protects vol, volpending and hw_delay | |||||
pthread_mutex_t mutex; | |||||
// Current volume in the 0..SIO_MAXVOL range | |||||
int vol; | |||||
// Set to 1 if volumes must be refreshed in the realtime thread | |||||
int volpending; | |||||
// Number of bytes buffered in the hardware | |||||
int hw_delay; | |||||
// Temporary buffer where data is stored sndio-compatible format | |||||
char* buffer; | |||||
DISALLOW_COPY_AND_ASSIGN(SndioAudioOutputStream); | |||||
}; | |||||
} // namespace media | |||||
#endif // MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_ |