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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.
//
// This file contains abstract classes used for media filter to handle video
// capture devices.
#ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "media/base/media_export.h"
#include "media/video/capture/video_capture_types.h"
namespace media {
class VideoFrame;
class MEDIA_EXPORT VideoCapture {
public:
// TODO(wjia): add error codes.
// TODO(wjia): support weak ptr.
// Callbacks provided by client for notification of events.
class MEDIA_EXPORT EventHandler {
public:
// Notify client that video capture has been started.
virtual void OnStarted(VideoCapture* capture) = 0;
// Notify client that video capture has been stopped.
virtual void OnStopped(VideoCapture* capture) = 0;
// Notify client that video capture has been paused.
virtual void OnPaused(VideoCapture* capture) = 0;
// Notify client that video capture has hit some error |error_code|.
virtual void OnError(VideoCapture* capture, int error_code) = 0;
// Notify client that the client has been removed and no more calls will be
// received.
virtual void OnRemoved(VideoCapture* capture) = 0;
// Notify client that a buffer is available.
virtual void OnFrameReady(
VideoCapture* capture,
const scoped_refptr<media::VideoFrame>& frame) = 0;
protected:
virtual ~EventHandler() {}
};
typedef base::Callback<void(const media::VideoCaptureFormats&)>
DeviceFormatsCallback;
VideoCapture() {}
// Request video capture to start capturing with |params|.
// Also register |handler| with video capture for event handling.
// |handler| must remain valid until it has received |OnRemoved()|.
virtual void StartCapture(EventHandler* handler,
const VideoCaptureParams& params) = 0;
// Request video capture to stop capturing for client |handler|.
// |handler| must remain valid until it has received |OnRemoved()|.
virtual void StopCapture(EventHandler* handler) = 0;
virtual bool CaptureStarted() = 0;
virtual int CaptureFrameRate() = 0;
// Request the device capture supported formats. This method can be called
// before startCapture() and/or after stopCapture() so a |callback| is used
// instead of replying via EventHandler.
virtual void GetDeviceSupportedFormats(
const DeviceFormatsCallback& callback) = 0;
protected:
virtual ~VideoCapture() {}
private:
DISALLOW_COPY_AND_ASSIGN(VideoCapture);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
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