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// Copyright (c) 2015 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_BASE_OUTPUT_DEVICE_H_
#define MEDIA_BASE_OUTPUT_DEVICE_H_
#include <string>
#include "base/callback.h"
#include "media/audio/audio_parameters.h"
#include "media/base/media_export.h"
#include "url/origin.h"
namespace media {
// Result of an audio output device switch operation
enum OutputDeviceStatus {
OUTPUT_DEVICE_STATUS_OK = 0,
OUTPUT_DEVICE_STATUS_ERROR_NOT_FOUND,
OUTPUT_DEVICE_STATUS_ERROR_NOT_AUTHORIZED,
OUTPUT_DEVICE_STATUS_ERROR_INTERNAL,
OUTPUT_DEVICE_STATUS_LAST = OUTPUT_DEVICE_STATUS_ERROR_INTERNAL,
};
typedef base::Callback<void(OutputDeviceStatus)> SwitchOutputDeviceCB;
// OutputDevice is an interface that allows performing operations related
// audio output devices.
class OutputDevice {
public:
// Attempts to switch the audio output device.
// Once the attempt is finished, |callback| is invoked with the
// result of the operation passed as a parameter. The result is a value from
// the media::SwitchOutputDeviceResult enum.
// There is no guarantee about the thread where |callback| will
// be invoked, so users are advised to use media::BindToCurrentLoop() to
// ensure that |callback| runs on the correct thread.
// Note also that copy constructors and destructors for arguments bound to
// |callback| may run on arbitrary threads as |callback| is moved across
// threads. It is advisable to bind arguments such that they are released by
// |callback| when it runs in order to avoid surprises.
virtual void SwitchOutputDevice(const std::string& device_id,
const url::Origin& security_origin,
const SwitchOutputDeviceCB& callback) = 0;
// Returns the device's audio output parameters.
// The return value is undefined if the device status (as returned by
// GetDeviceStatus()) is different from OUTPUT_DEVICE_STATUS_OK.
// If the parameters are not available, this method may block until they
// become available.
// This method must never be called on the IO thread.
virtual AudioParameters GetOutputParameters() = 0;
// Returns the status of output device.
// If the status is not available, this method may block until it becomes
// available. Must never be called on the IO thread.
virtual OutputDeviceStatus GetDeviceStatus() = 0;
protected:
virtual ~OutputDevice() {}
};
} // namespace media
#endif // MEDIA_BASE_OUTPUT_DEVICE_H_
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