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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_BASE_DECODER_H_
#define REMOTING_BASE_DECODER_H_
#include "base/memory/scoped_ptr.h"
#include "media/base/video_frame.h"
#include "remoting/proto/video.pb.h"
#include "third_party/skia/include/core/SkRegion.h"
namespace remoting {
// Interface for a decoder that takes a stream of bytes from the network and
// outputs frames of data.
//
// TODO(ajwong): Beef up this documentation once the API stablizes.
class Decoder {
public:
// DecodeResult is returned from DecodePacket() and indicates current state
// of the decoder. DECODE_DONE means that last packet for the frame was
// processed, and the frame can be displayed now. DECODE_IN_PROGRESS
// indicates that the decoder must receive more data before the frame can be
// displayed. DECODE_ERROR is returned if there was an error in the stream.
enum DecodeResult {
DECODE_ERROR = -1,
DECODE_IN_PROGRESS,
DECODE_DONE,
};
Decoder() {}
virtual ~Decoder() {}
// Initializes the decoder to draw into the given |frame|.
virtual void Initialize(scoped_refptr<media::VideoFrame> frame) = 0;
// Feeds more data into the decoder.
virtual DecodeResult DecodePacket(const VideoPacket* packet) = 0;
// Returns the region affected by the most recent frame. Can be called only
// after DecodePacket returned DECODE_DONE. Caller keeps ownership of
// |region|.
virtual void GetUpdatedRegion(SkRegion* region) = 0;
// Reset the decoder to an uninitialized state. Release all references to
// the initialized |frame|. Initialize() must be called before the decoder
// is used again.
virtual void Reset() = 0;
// Returns true if decoder is ready to accept data via DecodePacket.
virtual bool IsReadyForData() = 0;
virtual VideoPacketFormat::Encoding Encoding() = 0;
// Set the output dimensions for the decoder. If the dimensions are empty
// then the source is rendered without scaling.
// Output dimensions are ignored if the decoder doesn't support scaling.
virtual void SetOutputSize(const SkISize& size) {}
// Set the clipping rectangle to the decoder. Decoder should respect this and
// only output changes in this rectangle. The new clipping rectangle will be
// effective on the next decoded video frame.
virtual void SetClipRect(const SkIRect& clip_rect) {}
// Force decoder to output a frame based on the specified |region| of the
// most recently decoded video frame. |region| is expressed in video frame
// rather than output coordinates.
virtual void RefreshRegion(const SkRegion& region) {}
};
} // namespace remoting
#endif // REMOTING_BASE_DECODER_H_
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