blob: 0c2969da3cf6ad6db808a1846c9c90ef87db8dee [file] [log] [blame]
// 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 "base/message_loop_proxy.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
#include "media/base/audio_converter.h"
namespace media {
class AudioManagerBase;
class VirtualAudioInputStream;
// VirtualAudioOutputStream attaches to a VirtualAudioInputStream when Start()
// is called and is used as an audio source. VirtualAudioOutputStream also
// implements an interface so it can be used as an input to AudioConverter so
// that we can get audio frames that match the AudioParameters that
// VirtualAudioInputStream expects.
class MEDIA_EXPORT VirtualAudioOutputStream
: public AudioOutputStream,
public AudioConverter::InputCallback {
static VirtualAudioOutputStream* MakeStream(
AudioManagerBase* manager,
const AudioParameters& params,
base::MessageLoopProxy* message_loop,
VirtualAudioInputStream* target);
virtual ~VirtualAudioOutputStream();
// AudioOutputStream:
virtual bool Open() OVERRIDE;
virtual void Start(AudioSourceCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual void GetVolume(double* volume) OVERRIDE;
virtual void Close() OVERRIDE;
VirtualAudioOutputStream(AudioManagerBase* manager,
const AudioParameters& params,
base::MessageLoopProxy* message_loop,
VirtualAudioInputStream* target);
// AudioConverter::InputCallback:
virtual double ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) OVERRIDE;
AudioManagerBase* audio_manager_;
base::MessageLoopProxy* message_loop_;
AudioSourceCallback* callback_;
AudioParameters params_;
// Pointer to the VirtualAudioInputStream to attach to when Start() is called.
// This pointer should always be valid because VirtualAudioInputStream should
// outlive this class.
VirtualAudioInputStream* target_input_stream_;
double volume_;
bool attached_;
} // namespace media