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// Copyright 2017 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_FUCHSIA_AUDIO_OUTPUT_STREAM_FUCHSIA_H_
#define MEDIA_AUDIO_FUCHSIA_AUDIO_OUTPUT_STREAM_FUCHSIA_H_
#include <fuchsia/media/cpp/fidl.h>
#include "base/memory/shared_memory_mapping.h"
#include "base/timer/timer.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_parameters.h"
namespace media {
class AudioManagerFuchsia;
class AudioOutputStreamFuchsia : public AudioOutputStream {
public:
// Caller must ensure that manager outlives the stream.
AudioOutputStreamFuchsia(AudioManagerFuchsia* manager,
const AudioParameters& parameters);
// AudioOutputStream interface.
bool Open() override;
void Start(AudioSourceCallback* callback) override;
void Stop() override;
void Flush() override;
void SetVolume(double volume) override;
void GetVolume(double* volume) override;
void Close() override;
private:
~AudioOutputStreamFuchsia() override;
// Returns minimum |payload_buffer_| size for the current |min_lead_time_|.
size_t GetMinBufferSize();
// Allocates and maps |payload_buffer_|.
bool InitializePayloadBuffer();
base::TimeTicks GetCurrentStreamTime();
// Event handler for |audio_out_|.
void OnMinLeadTimeChanged(int64_t min_lead_time);
// Error handler for |audio_out_|.
void OnRendererError(zx_status_t status);
// Resets internal state and reports an error to |callback_|.
void ReportError();
// Requests data from AudioSourceCallback, passes it to the mixer and
// schedules |timer_| for the next call.
void PumpSamples();
// Schedules |timer_| to call PumpSamples() when appropriate for the next
// packet.
void SchedulePumpSamples(base::TimeTicks now);
AudioManagerFuchsia* manager_;
AudioParameters parameters_;
fuchsia::media::AudioRendererPtr audio_renderer_;
// |audio_bus_| is used only in PumpSamples(). It is kept here to avoid
// reallocating the memory every time.
std::unique_ptr<AudioBus> audio_bus_;
base::WritableSharedMemoryMapping payload_buffer_;
size_t payload_buffer_pos_ = 0;
AudioSourceCallback* callback_ = nullptr;
double volume_ = 1.0;
base::TimeTicks reference_time_;
int64_t stream_position_samples_;
// Current min lead time for the stream. This value is updated by
// AudioRenderer::OnMinLeadTimeChanged event. Assume 50ms until we get the
// first OnMinLeadTimeChanged event.
base::TimeDelta min_lead_time_ = base::TimeDelta::FromMilliseconds(50);
// Timer that's scheduled to call PumpSamples().
base::OneShotTimer timer_;
DISALLOW_COPY_AND_ASSIGN(AudioOutputStreamFuchsia);
};
} // namespace media
#endif // MEDIA_AUDIO_FUCHSIA_AUDIO_OUTPUT_STREAM_FUCHSIA_H_
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