09c1114e71
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91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
--- media/audio/sndio/sndio_output.h.orig 2022-02-07 13:39:41 UTC
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+++ media/audio/sndio/sndio_output.h
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@@ -0,0 +1,88 @@
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style license that can be
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+// found in the LICENSE file.
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+
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+#ifndef MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
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+#define MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
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+
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+#include <pthread.h>
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+#include <sndio.h>
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+
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+#include "base/time/tick_clock.h"
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+#include "base/time/time.h"
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+#include "media/audio/audio_io.h"
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+
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+namespace media {
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+
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+class AudioManagerBase;
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+
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+// Implementation of AudioOutputStream using sndio(7)
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+class SndioAudioOutputStream : public AudioOutputStream {
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+ public:
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+ // The manager is creating this object
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+ SndioAudioOutputStream(const AudioParameters& params,
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+ AudioManagerBase* manager);
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+
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+ SndioAudioOutputStream(const SndioAudioOutputStream&) = delete;
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+ SndioAudioOutputStream& operator=(const SndioAudioOutputStream&) = delete;
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+
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+ virtual ~SndioAudioOutputStream();
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+
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+ // Implementation of AudioOutputStream.
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+ bool Open() override;
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+ void Close() override;
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+ void Start(AudioSourceCallback* callback) override;
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+ void Stop() override;
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+ void SetVolume(double volume) override;
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+ void GetVolume(double* volume) override;
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+ void Flush() override;
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+
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+ friend void sndio_onmove(void *arg, int delta);
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+ friend void sndio_onvol(void *arg, unsigned int vol);
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+ friend void *sndio_threadstart(void *arg);
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+
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+ private:
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+ enum StreamState {
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+ kClosed, // Not opened yet
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+ kStopped, // Device opened, but not started yet
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+ kRunning, // Started, device playing
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+ kStopWait // Stopping, waiting for the real-time thread to exit
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+ };
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+
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+ // C-style call-backs
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+ static void OnMoveCallback(void *arg, int delta);
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+ static void OnVolCallback(void *arg, unsigned int vol);
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+ static void* ThreadEntry(void *arg);
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+
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+ // Continuously moves data from the producer to the device
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+ void ThreadLoop(void);
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+
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+ // Our creator, the audio manager needs to be notified when we close.
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+ AudioManagerBase* manager;
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+ // Parameters of the source
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+ AudioParameters params;
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+ // Source stores data here
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+ std::unique_ptr<AudioBus> audio_bus;
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+ // Call-back that produces data to play
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+ AudioSourceCallback* source;
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+ // Handle of the audio device
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+ struct sio_hdl* hdl;
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+ // Current state of the stream
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+ enum StreamState state;
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+ // High priority thread running ThreadLoop()
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+ pthread_t thread;
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+ // Protects vol, volpending and hw_delay
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+ pthread_mutex_t mutex;
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+ // Current volume in the 0..SIO_MAXVOL range
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+ int vol;
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+ // Set to 1 if volumes must be refreshed in the realtime thread
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+ int volpending;
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+ // Number of frames buffered in the hardware
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+ int hw_delay;
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+ // Temporary buffer where data is stored sndio-compatible format
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+ char* buffer;
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+};
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+
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+} // namespace media
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+
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+#endif // MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
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