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Unified Diff: media/video/capture/video_capture.h

Issue 263323003: Revert of Refactor video capturing code in the render process (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 7 months ago
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Index: media/video/capture/video_capture.h
diff --git a/media/video/capture/video_capture.h b/media/video/capture/video_capture.h
new file mode 100644
index 0000000000000000000000000000000000000000..0dd7b04a3f5a556b5ea2e9dfde391fd3e6e1aa2b
--- /dev/null
+++ b/media/video/capture/video_capture.h
@@ -0,0 +1,95 @@
+// 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;
+
+ typedef base::Callback<void(const media::VideoCaptureFormats&)>
+ DeviceFormatsInUseCallback;
+
+ 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;
+
+ // Request the device capture in-use format(s), possibly by other user(s) in
+ // other renderer(s). If there is no format in use, the vector returned in
+ // the callback will be empty.
+ virtual void GetDeviceFormatsInUse(
+ const DeviceFormatsInUseCallback& callback) = 0;
+
+ protected:
+ virtual ~VideoCapture() {}
+
+ private:
+ DISALLOW_COPY_AND_ASSIGN(VideoCapture);
+};
+
+} // namespace media
+
+#endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
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