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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef VideoFrameProvider_h
     32 #define VideoFrameProvider_h
     33 
     34 #include "VideoFrameChromium.h"
     35 
     36 namespace WebCore {
     37 
     38 class VideoFrameProvider {
     39 public:
     40     virtual ~VideoFrameProvider() { }
     41 
     42     // This function returns a pointer to a VideoFrameChromium, which is
     43     // the WebCore wrapper for a video frame in Chromium. getCurrentFrame()
     44     // places a lock on the frame in Chromium. Calls to this method should
     45     // always be followed with a call to putCurrentFrame().
     46     // The ownership of the object is not transferred to the caller and
     47     // the caller should not free the returned object.
     48     virtual VideoFrameChromium* getCurrentFrame() = 0;
     49     // This function releases the lock on the video frame in chromium. It should
     50     // always be called after getCurrentFrame(). Frames passed into this method
     51     // should no longer be referenced after the call is made.
     52     virtual void putCurrentFrame(VideoFrameChromium*) = 0;
     53 };
     54 
     55 } // namespace WebCore
     56 
     57 #endif
     58