gecko/content/media/raw/nsRawReader.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla code.
 *
 * The Initial Developer of the Original Code is 
 *   Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Brad Lassey
 *  Kyle Huey <me@kylehuey.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#if !defined(nsRawReader_h_)
#define nsRawReader_h_

#include "nsBuiltinDecoderReader.h"

struct nsRawVideo_PRUint24 {
  operator PRUint32() const { return value[2] << 16 | value[1] << 8 | value[0]; }
private:
  PRUint8 value[3];
};

struct nsRawPacketHeader {
  typedef nsRawVideo_PRUint24 PRUint24;
  PRUint8 packetID;
  PRUint24 codecID;
};

// This is Arc's draft from wiki.xiph.org/OggYUV
struct nsRawVideoHeader {
  typedef nsRawVideo_PRUint24 PRUint24;
  PRUint8 headerPacketID;          // Header Packet ID (always 0)
  PRUint24 codecID;                // Codec identifier (always "YUV")
  PRUint8 majorVersion;            // Version Major (breaks backwards compat)
  PRUint8 minorVersion;            // Version Minor (preserves backwards compat)
  PRUint16 options;                // Bit 1: Color (false = B/W)
                                   // Bits 2-4: Chroma Pixel Shape
                                   // Bit 5: 50% horizontal offset for Cr samples
                                   // Bit 6: 50% vertical ...
                                   // Bits 7-8: Chroma Blending
                                   // Bit 9: Packed (false = Planar)
                                   // Bit 10: Cr Staggered Horizontally
                                   // Bit 11: Cr Staggered Vertically
                                   // Bit 12: Unused (format is always little endian)
                                   // Bit 13: Interlaced (false = Progressive)
                                   // Bits 14-16: Interlace options (undefined)

  PRUint8 alphaChannelBpp;
  PRUint8 lumaChannelBpp;
  PRUint8 chromaChannelBpp;
  PRUint8 colorspace;

  PRUint24 frameWidth;
  PRUint24 frameHeight;
  PRUint24 aspectNumerator;
  PRUint24 aspectDenominator;

  PRUint32 framerateNumerator;
  PRUint32 framerateDenominator;
};

class nsRawReader : public nsBuiltinDecoderReader
{
public:
  nsRawReader(nsBuiltinDecoder* aDecoder);
  ~nsRawReader();

  virtual nsresult Init();
  virtual nsresult ResetDecode();
  virtual PRBool DecodeAudioData();

  virtual PRBool DecodeVideoFrame(PRBool &aKeyframeSkip,
                                  PRInt64 aTimeThreshold);

  virtual PRBool HasAudio()
  {
    return PR_FALSE;
  }

  virtual PRBool HasVideo()
  {
    return PR_TRUE;
  }

  virtual nsresult ReadMetadata();
  virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
  virtual PRInt64 FindEndTime(PRInt64 aEndOffset);
  virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);

private:
  PRBool ReadFromStream(nsMediaStream *aStream, PRUint8 *aBuf,
                        PRUint32 aLength);

  nsRawVideoHeader mMetadata;
  PRUint32 mCurrentFrame;
  double mFrameRate;
  PRUint32 mFrameSize;
};

#endif