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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_H_
#define MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
#include <map>
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_renderer_sink.h"
namespace media {
// Mixes a set of AudioConverter::InputCallbacks into a single output stream
// which is funneled into a single shared AudioRendererSink; saving a bundle
// on renderer side resources.
class MEDIA_EXPORT AudioRendererMixer
: NON_EXPORTED_BASE(public AudioRendererSink::RenderCallback) {
public:
AudioRendererMixer(const AudioParameters& input_params,
const AudioParameters& output_params,
const scoped_refptr<AudioRendererSink>& sink);
virtual ~AudioRendererMixer();
// Add or remove a mixer input from mixing; called by AudioRendererMixerInput.
void AddMixerInput(AudioConverter::InputCallback* input,
const base::Closure& error_cb);
void RemoveMixerInput(AudioConverter::InputCallback* input);
void set_pause_delay_for_testing(base::TimeDelta delay) {
pause_delay_ = delay;
}
private:
// AudioRendererSink::RenderCallback implementation.
virtual int Render(AudioBus* audio_bus,
int audio_delay_milliseconds) OVERRIDE;
virtual void OnRenderError() OVERRIDE;
// Output sink for this mixer.
scoped_refptr<AudioRendererSink> audio_sink_;
// Set of mixer inputs to be mixed by this mixer. Access is thread-safe
// through |mixer_inputs_lock_|.
typedef std::map<AudioConverter::InputCallback*, base::Closure>
AudioRendererMixerInputSet;
AudioRendererMixerInputSet mixer_inputs_;
base::Lock mixer_inputs_lock_;
// Handles mixing and resampling between input and output parameters.
AudioConverter audio_converter_;
// Handles physical stream pause when no inputs are playing. For latency
// reasons we don't want to immediately pause the physical stream.
base::TimeDelta pause_delay_;
base::TimeTicks last_play_time_;
bool playing_;
DISALLOW_COPY_AND_ASSIGN(AudioRendererMixer);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_RENDERER_MIXER_H_
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