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--- media/audio/sndio/sndio_output.h.orig 2022-02-07 13:39:41 UTC
+++ media/audio/sndio/sndio_output.h
@@ -0,0 +1,88 @@
+// 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 AudioManagerBase;
+
+// Implementation of AudioOutputStream using sndio(7)
+class SndioAudioOutputStream : public AudioOutputStream {
+ public:
+ // The manager is creating this object
+ SndioAudioOutputStream(const AudioParameters& params,
+ AudioManagerBase* manager);
+
+ SndioAudioOutputStream(const SndioAudioOutputStream&) = delete;
+ SndioAudioOutputStream& operator=(const SndioAudioOutputStream&) = delete;
+
+ virtual ~SndioAudioOutputStream();
+
+ // Implementation of AudioOutputStream.
+ bool Open() override;
+ void Close() override;
+ void Start(AudioSourceCallback* callback) override;
+ void Stop() override;
+ void SetVolume(double volume) override;
+ void GetVolume(double* volume) override;
+ void Flush() override;
+
+ 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
+ };
+
+ // C-style call-backs
+ static void OnMoveCallback(void *arg, int delta);
+ static void OnVolCallback(void *arg, unsigned int vol);
+ static void* ThreadEntry(void *arg);
+
+ // Continuously moves data from the producer to the device
+ void ThreadLoop(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;
+ // 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 ThreadLoop()
+ 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 frames buffered in the hardware
+ int hw_delay;
+ // Temporary buffer where data is stored sndio-compatible format
+ char* buffer;
+};
+
+} // namespace media
+
+#endif // MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
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