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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 <vector>
#include "base/callback.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_renderer_sink.h"
namespace media {
class AudioRendererMixer;
class MEDIA_EXPORT AudioRendererMixerInput
: NON_EXPORTED_BASE(public AudioRendererSink),
public AudioConverter::InputCallback {
public:
typedef base::Callback<AudioRendererMixer*(
const AudioParameters& params)> GetMixerCB;
typedef base::Callback<void(const AudioParameters& params)> RemoveMixerCB;
AudioRendererMixerInput(
const GetMixerCB& get_mixer_cb, const RemoveMixerCB& remove_mixer_cb);
// AudioRendererSink implementation.
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Play() OVERRIDE;
virtual void Pause() OVERRIDE;
virtual bool SetVolume(double volume) OVERRIDE;
virtual void Initialize(const AudioParameters& params,
AudioRendererSink::RenderCallback* renderer) OVERRIDE;
// Called by AudioRendererMixer when an error occurs.
void OnRenderError();
protected:
virtual ~AudioRendererMixerInput();
private:
friend class AudioRendererMixerInputTest;
bool playing_;
bool initialized_;
double volume_;
// AudioConverter::InputCallback implementation.
virtual 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.
GetMixerCB get_mixer_cb_;
RemoveMixerCB remove_mixer_cb_;
// AudioParameters received during Initialize().
AudioParameters params_;
// 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.
base::Closure error_cb_;
DISALLOW_COPY_AND_ASSIGN(AudioRendererMixerInput);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_RENDERER_MIXER_INPUT_H_
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