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// Copyright (c) 2013 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.
//
// An AudioInputStream which provides a loop-back of all audio output generated
// by the RenderView associated with a WebContents instance. The single stream
// of data is produced by format-converting and mixing all audio output from a
// RenderView. In other words, WebContentsAudioInputStream provides tab-level
// audio mirroring.
//
// The implementation observes a WebContents instance (which represents a
// browser tab) so that it can track the replacement of RenderViews due to
// navigation, crash/reload, etc. events; and take appropriate actions to
// provide a seamless, uninterrupted mirroring experience.
#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "content/common/content_export.h"
#include "media/audio/audio_io.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class AudioParameters;
class VirtualAudioInputStream;
}
namespace content {
class AudioMirroringManager;
class WebContentsTracker;
class CONTENT_EXPORT WebContentsAudioInputStream
: NON_EXPORTED_BASE(public media::AudioInputStream) {
public:
// media::AudioInputStream implementation
virtual bool Open() OVERRIDE;
virtual void Start(AudioInputCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Close() OVERRIDE;
virtual double GetMaxVolume() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual double GetVolume() OVERRIDE;
virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
virtual bool GetAutomaticGainControl() OVERRIDE;
// Create a new audio mirroring session, or return NULL on error. |device_id|
// should be in the format accepted by
// WebContentsCaptureUtil::ExtractTabCaptureTarget(). The caller must
// guarantee Close() is called on the returned object so that it may
// self-destruct.
// |worker_task_runner| is the task runner on which AudioInputCallback methods
// are called and may or may not be the single thread that invokes the
// AudioInputStream methods.
static WebContentsAudioInputStream* Create(
const std::string& device_id,
const media::AudioParameters& params,
const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
AudioMirroringManager* audio_mirroring_manager);
private:
friend class WebContentsAudioInputStreamTest;
// Maintain most state and functionality in an internal ref-counted
// implementation class. This object must outlive a call to Close(), until
// the shutdown tasks running on other threads complete: The
// AudioMirroringManager on the IO thread, the WebContentsTracker on the UI
// thread, and the VirtualAudioOuputStreams on the audio thread.
class Impl;
WebContentsAudioInputStream(
int render_process_id, int render_view_id,
AudioMirroringManager* mirroring_manager,
const scoped_refptr<WebContentsTracker>& tracker,
media::VirtualAudioInputStream* mixer_stream);
virtual ~WebContentsAudioInputStream();
scoped_refptr<Impl> impl_;
DISALLOW_COPY_AND_ASSIGN(WebContentsAudioInputStream);
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_
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