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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_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
#define MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_renderer_sink.h"
#include "media/base/output_device.h"
#include "url/origin.h"
namespace media {
class AudioRendererMixer;
class MEDIA_EXPORT AudioRendererMixerInput
: NON_EXPORTED_BASE(public RestartableAudioRendererSink),
NON_EXPORTED_BASE(public OutputDevice),
public AudioConverter::InputCallback {
public:
typedef base::Callback<AudioRendererMixer*(const AudioParameters& params,
const std::string& device_id,
const url::Origin& security_origin,
OutputDeviceStatus* device_status)>
GetMixerCB;
typedef base::Callback<void(const AudioParameters& params,
const std::string& device_id,
const url::Origin& security_origin)>
RemoveMixerCB;
typedef base::Callback<AudioParameters(const std::string& device_id,
const url::Origin& security_origin)>
GetHardwareParamsCB;
AudioRendererMixerInput(const GetMixerCB& get_mixer_cb,
const RemoveMixerCB& remove_mixer_cb,
const GetHardwareParamsCB& get_hardware_params_cb,
const std::string& device_id,
const url::Origin& security_origin);
// RestartableAudioRendererSink implementation.
void Start() override;
void Stop() override;
void Play() override;
void Pause() override;
bool SetVolume(double volume) override;
OutputDevice* GetOutputDevice() override;
void Initialize(const AudioParameters& params,
AudioRendererSink::RenderCallback* renderer) override;
// OutputDevice implementation.
void SwitchOutputDevice(const std::string& device_id,
const url::Origin& security_origin,
const SwitchOutputDeviceCB& callback) override;
AudioParameters GetOutputParameters() override;
OutputDeviceStatus GetDeviceStatus() override;
// Called by AudioRendererMixer when an error occurs.
void OnRenderError();
protected:
~AudioRendererMixerInput() override;
private:
friend class AudioRendererMixerInputTest;
bool started_;
bool playing_;
double volume_;
// AudioConverter::InputCallback implementation.
double ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) override;
// Callbacks provided during construction which allow AudioRendererMixerInput
// to retrieve a mixer during Initialize() and notify when it's done with it.
const GetMixerCB get_mixer_cb_;
const RemoveMixerCB remove_mixer_cb_;
// Callbacks provided during construction which allows AudioRendererMixerInput
// to access hardware output parameters when it is detached from the mixer.
const GetHardwareParamsCB get_hardware_params_cb_;
// AudioParameters received during Initialize().
AudioParameters params_;
// ID of hardware device to use
std::string device_id_;
url::Origin security_origin_;
// AudioRendererMixer provided through |get_mixer_cb_| during Initialize(),
// guaranteed to live (at least) until |remove_mixer_cb_| is called.
AudioRendererMixer* mixer_;
// Source of audio data which is provided to the mixer.
AudioRendererSink::RenderCallback* callback_;
// Error callback for handing to AudioRendererMixer.
const base::Closure error_cb_;
// Pending switch-device callback, in case SwitchOutputDevice() is invoked
// before Start()
SwitchOutputDeviceCB pending_switch_callback_;
std::string pending_switch_device_id_;
url::Origin pending_switch_security_origin_;
DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInput);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
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