content/media/video/public/nsChannelReader.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
   3 /* ***** BEGIN LICENSE BLOCK *****
   4  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5  *
   6  * The contents of this file are subject to the Mozilla Public License Version
   7  * 1.1 (the "License"); you may not use this file except in compliance with
   8  * the License. You may obtain a copy of the License at
   9  * http://www.mozilla.org/MPL/
  10  *
  11  * Software distributed under the License is distributed on an "AS IS" basis,
  12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13  * for the specific language governing rights and limitations under the
  14  * License.
  15  *
  16  * The Original Code is Mozilla code.
  17  *
  18  * The Initial Developer of the Original Code is the Mozilla Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 2007
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *  Chris Double <chris.double@double.co.nz>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
  29  * of those above. If you wish to allow use of your version of this file only
  30  * under the terms of either the GPL or the LGPL, and not to allow others to
  31  * use your version of this file under the terms of the MPL, indicate your
  32  * decision by deleting the provisions above and replace them with the notice
  33  * and other provisions required by the GPL or the LGPL. If you do not delete
  34  * the provisions above, a recipient may use your version of this file under
  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38 #if !defined(nsChannelReader_h___)
  39 #define nsChannelReader_h___
  40
  41 #include "nsCOMPtr.h"
  42 #include "nsIChannel.h"
  43 #include "nsIInputStream.h"
  44 #include "nsIOutputStream.h"
  45 #include "nsIRequestObserver.h"
  46 #include "nsIStreamListener.h"
  47
  48 #include "oggplay/oggplay.h"
  49
  50 class nsOggDecoder;
  51
  52 /*
  53    Reads all data on the input stream of a channel and
  54    writes it to a pipe. This allows a seperate thread to
  55    read data from a channel running on the main thread
  56 */
  57 class nsChannelToPipeListener : public nsIStreamListener
  58 {
  59   // ISupports
  60   NS_DECL_ISUPPORTS
  61
  62   // IRequestObserver
  63   NS_DECL_NSIREQUESTOBSERVER
  64
  65   // IStreamListener
  66   NS_DECL_NSISTREAMLISTENER
  67
  68   public:
  69   nsChannelToPipeListener(nsOggDecoder* aDecoder);
  70   nsresult Init();
  71   void GetInputStream(nsIInputStream** aStream);
  72   void Stop();
  73   double BytesPerSecond() const;
  74
  75 private:
  76   nsCOMPtr<nsIInputStream> mInput;
  77   nsCOMPtr<nsIOutputStream> mOutput;
  78   nsOggDecoder* mDecoder;
  79
  80   // Interval when download started. Used in
  81   // computing bytes per second download rate.
  82   PRIntervalTime mIntervalStart;
  83
  84   // Interval when last downloaded bytes occurred. Used in computer
  85   // bytes per second download rate.
  86   PRIntervalTime mIntervalEnd;
  87
  88   // Total bytes transferred so far
  89   PRInt64 mTotalBytes;
  90 };
  91
  92 class nsChannelReader : public OggPlayReader
  93 {
  94 public:
  95   nsChannelReader();
  96   nsresult Init(nsOggDecoder* aDecoder, nsIURI* aURI);
  97   PRUint32 Available();
  98   OggPlayErrorCode initialise(int aBlock);
  99   OggPlayErrorCode destroy();
 100   size_t io_read(char* aBuffer, size_t aCount);
 101   int io_seek(long aOffset, int aWhence);
 102   long io_tell();
 103
 104   // Return average number of bytes per second that the
 105   // download of the media resource is achieving.
 106   double BytesPerSecond() const;
 107
 108 public:
 109   nsCOMPtr<nsIChannel>  mChannel;
 110   nsCOMPtr<nsIInputStream>  mInput;
 111   nsCOMPtr<nsChannelToPipeListener> mListener;
 112   unsigned long mCurrentPosition;
 113 };
 114
 115 #endif