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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.
#ifndef REMOTING_CODEC_VIDEO_DECODER_H_
#define REMOTING_CODEC_VIDEO_DECODER_H_
#include "base/basictypes.h"
#include "remoting/proto/video.pb.h"
namespace webrtc {
class DesktopRect;
class DesktopRegion;
class DesktopSize;
} // namespace webrtc
namespace remoting {
// Interface for a decoder that takes a stream of bytes from the network and
// outputs frames of data.
class VideoDecoder {
public:
static const int kBytesPerPixel = 4;
VideoDecoder() {}
virtual ~VideoDecoder() {}
// Initializes the decoder and sets the output dimensions.
// |screen size| must not be empty.
virtual void Initialize(const webrtc::DesktopSize& screen_size) = 0;
// Feeds more data into the decoder. Returns true if |packet| was processed
// and the frame can be displayed now.
virtual bool DecodePacket(const VideoPacket& packet) = 0;
// Marks the specified |region| of the view for update the next time
// RenderFrame() is called. |region| is expressed in |view_size| coordinates.
// |view_size| must not be empty.
virtual void Invalidate(const webrtc::DesktopSize& view_size,
const webrtc::DesktopRegion& region) = 0;
// Copies invalidated pixels within |clip_area| to |image_buffer|. Pixels are
// invalidated either by new data received in DecodePacket(), or by explicit
// calls to Invalidate(). |clip_area| is specified in |view_size| coordinates.
// If |view_size| differs from the source size then the copied pixels will be
// scaled accordingly. |view_size| cannot be empty.
//
// |image_buffer|'s origin must correspond to the top-left of |clip_area|,
// and the buffer must be large enough to hold |clip_area| RGBA32 pixels.
// |image_stride| gives the output buffer's stride in pixels.
//
// On return, |output_region| contains the updated area, in |view_size|
// coordinates.
virtual void RenderFrame(const webrtc::DesktopSize& view_size,
const webrtc::DesktopRect& clip_area,
uint8* image_buffer,
int image_stride,
webrtc::DesktopRegion* output_region) = 0;
// Returns the "shape", if any, of the most recently rendered frame.
// The shape is returned in source dimensions.
virtual const webrtc::DesktopRegion* GetImageShape() = 0;
};
} // namespace remoting
#endif // REMOTING_CODEC_VIDEO_DECODER_H_
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