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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.
#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 {
typedef base::Callback<AudioRendererMixer*(
const AudioParameters& params)> GetMixerCB;
typedef base::Callback<void(const AudioParameters& params)> RemoveMixerCB;
const GetMixerCB& get_mixer_cb, const RemoveMixerCB& remove_mixer_cb);
// AudioRendererSink implementation.
void Start() override;
void Stop() override;
void Play() override;
void Pause() override;
bool SetVolume(double volume) override;
void Initialize(const AudioParameters& params,
AudioRendererSink::RenderCallback* renderer) override;
// Called by AudioRendererMixer when an error occurs.
void OnRenderError();
~AudioRendererMixerInput() override;
friend class AudioRendererMixerInputTest;
bool playing_;
bool initialized_;
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.
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.
const base::Closure error_cb_;
} // namespace media