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// Copyright (c) 2010 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.
#ifndef MEDIA_VIDEO_VIDEO_DECODE_CONTEXT_H_
#define MEDIA_VIDEO_VIDEO_DECODE_CONTEXT_H_
#include <vector>
#include "base/task.h"
#include "media/base/video_frame.h"
namespace media {
class VideoFrame;
// A VideoDecodeContext is used by VideoDecodeEngine to provide the following
// functions:
//
// 1. Provides access to hardware video decoding device.
// 2. Allocate VideoFrame objects that are used to carry the decoded video
// frames.
class VideoDecodeContext {
public:
virtual ~VideoDecodeContext() {};
// Obtain a handle to the hardware video decoder device. The type of the
// handle is a contract between the implementation of VideoDecodeContext and
// VideoDecodeEngine.
//
// If a hardware device is not needed this method should return NULL.
virtual void* GetDevice() = 0;
// Allocate |n| video frames with dimension |width| and |height|. |task|
// is called when allocation has completed.
//
// |frames| is the output parameter for VideFrame(s) allocated.
virtual void AllocateVideoFrames(
int n, size_t width, size_t height, VideoFrame::Format format,
std::vector<scoped_refptr<VideoFrame> >* frames,
Task* task) = 0;
// Release all video frames allocated by the context. After making this call
// VideoDecodeEngine should not use the VideoFrame allocated because they
// could be destroyed.
virtual void ReleaseAllVideoFrames() = 0;
// Destroy this context asynchronously. When the operation is done |task|
// is called.
//
// ReleaseVideoFrames() need to be called with all the video frames allocated
// before making this call.
virtual void Destroy(Task* task) = 0;
};
} // namespace media
#endif // MEDIA_VIDEO_VIDEO_DECODE_CONTEXT_H_
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