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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WebVideoFrameProvider_h
#define WebVideoFrameProvider_h
#include "WebCommon.h"
#include "WebVideoFrame.h"
namespace WebKit {
// Threading notes: This class may be used in a multi threaded manner. Specifically, the implementation
// may call getCurrentFrame() / putCurrentFrame() from a non-main thread. If so, the caller is responsible
// for making sure Client::didReceiveFrame and Client::didUpdateMatrix are only called from this thread.
class WebVideoFrameProvider {
public:
virtual ~WebVideoFrameProvider() { }
class Client {
public:
// Provider will call this method to tell the client to stop using it.
// stopUsingProvider() may be called from any thread. The client should
// block until it has putCurrentFrame any outstanding frames.
virtual void stopUsingProvider() = 0;
// Notifies the provider's client that a call to getCurrentFrame() will return new data.
virtual void didReceiveFrame() = 0;
// Notifies the provider's client of a new UV transform matrix to be used when drawing frames
// of type WebVideoFrame::FormatStreamTexture.
virtual void didUpdateMatrix(const float*) = 0;
};
// May be called from any thread, but there must be some external guarantee
// that the provider is not destroyed before this call returns.
virtual void setVideoFrameProviderClient(Client*) = 0;
// This function places a lock on the current frame and returns a pointer to it.
// Calls to this method should always be followed with a call to putCurrentFrame().
// The ownership of the object is not transferred to the caller and
// the caller should not free the returned object. Only the current provider
// client should call this function.
virtual WebVideoFrame* getCurrentFrame() = 0;
// This function releases the lock on the video frame in chromium. It should
// always be called after getCurrentFrame(). Frames passed into this method
// should no longer be referenced after the call is made. Only the current
// provider client should call this function.
virtual void putCurrentFrame(WebVideoFrame*) = 0;
};
} // namespace WebKit
#endif
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