content/media/video/src/nsVideoDecoder.cpp

   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: ML 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 #include "prlog.h"
  39 #include "prmem.h"
  40 #include "nsIFrame.h"
  41 #include "nsIDocument.h"
  42 #include "nsThreadUtils.h"
  43 #include "nsIDOMHTMLMediaElement.h"
  44 #include "nsNetUtil.h"
  45 #include "nsHTMLMediaElement.h"
  46 #include "nsIObserver.h"
  47 #include "nsIObserverService.h"
  48 #include "nsAutoLock.h"
  49 #include "nsIRenderingContext.h"
  50 #include "gfxContext.h"
  51 #include "gfxImageSurface.h"
  52 #include "nsPresContext.h"
  53 #include "nsVideoDecoder.h"
  54
  55 #ifdef PR_LOGGING
  56 // Logging object for decoder
  57 PRLogModuleInfo* gVideoDecoderLog = nsnull;
  58 #endif
  59
  60 nsVideoDecoder::nsVideoDecoder() :
  61   mElement(0),
  62   mRGBWidth(-1),
  63   mRGBHeight(-1),
  64   mSizeChanged(PR_FALSE),
  65   mVideoUpdateLock(nsnull),
  66   mFramerate(0.0)
  67 {
  68 }
  69
  70 PRBool nsVideoDecoder::Init()
  71 {
  72   mVideoUpdateLock = PR_NewLock();
  73
  74   return mVideoUpdateLock != nsnull;
  75 }
  76
  77 void nsVideoDecoder::Shutdown()
  78 {
  79   if (mVideoUpdateLock) {
  80     PR_DestroyLock(mVideoUpdateLock);
  81     mVideoUpdateLock = nsnull;
  82   }
  83 }
  84
  85
  86 nsresult nsVideoDecoder::InitLogger()
  87 {
  88 #ifdef PR_LOGGING
  89   gVideoDecoderLog = PR_NewLogModule("nsVideoDecoder");
  90 #endif
  91   return NS_OK;
  92 }
  93
  94 static void InvalidateCallback(nsITimer* aTimer, void* aClosure)
  95 {
  96   nsVideoDecoder* decoder = static_cast<nsVideoDecoder*>(aClosure);
  97   decoder->Invalidate();
  98 }
  99
 100 nsresult nsVideoDecoder::StartInvalidating(double aFramerate)
 101 {
 102   nsresult rv = NS_OK;
 103
 104   if (!mInvalidateTimer && aFramerate > 0.0) {
 105     mInvalidateTimer = do_CreateInstance("@mozilla.org/timer;1");
 106     rv = mInvalidateTimer->InitWithFuncCallback(InvalidateCallback,
 107                                                 this,
 108                                                 static_cast<PRInt32>(1000.0/aFramerate),
 109                                                 nsITimer::TYPE_REPEATING_PRECISE);
 110   }
 111   return rv;
 112 }
 113
 114 void nsVideoDecoder::StopInvalidating()
 115 {
 116   if (mInvalidateTimer) {
 117     mInvalidateTimer->Cancel();
 118     mInvalidateTimer = nsnull;
 119   }
 120 }
 121
 122 void nsVideoDecoder::Invalidate()
 123 {
 124   if (!mElement)
 125     return;
 126
 127   nsIFrame* frame = mElement->GetPrimaryFrame();
 128   if (!frame)
 129     return;
 130
 131   {
 132     nsAutoLock lock(mVideoUpdateLock);
 133     if (mSizeChanged) {
 134       mSizeChanged = PR_FALSE;
 135       nsPresContext* presContext = frame->PresContext();
 136       nsIPresShell *presShell = presContext->PresShell();
 137       presShell->FrameNeedsReflow(frame,
 138                                   nsIPresShell::eStyleChange,
 139                                   NS_FRAME_IS_DIRTY);
 140     }
 141   }
 142   nsRect r(nsPoint(0,0), frame->GetSize());
 143   frame->Invalidate(r, PR_FALSE);
 144 }
 145
 146 static void ProgressCallback(nsITimer* aTimer, void* aClosure)
 147 {
 148   nsVideoDecoder* decoder = static_cast<nsVideoDecoder*>(aClosure);
 149   decoder->Progress();
 150 }
 151
 152 void nsVideoDecoder::Progress()
 153 {
 154   if (!mElement)
 155     return;
 156
 157   mElement->DispatchProgressEvent(NS_LITERAL_STRING("progress"));
 158 }
 159
 160 nsresult nsVideoDecoder::StartProgress()
 161 {
 162   nsresult rv = NS_OK;
 163
 164   if (!mProgressTimer) {
 165     mProgressTimer = do_CreateInstance("@mozilla.org/timer;1");
 166     rv = mProgressTimer->InitWithFuncCallback(ProgressCallback,
 167                                               this,
 168                                               350, // Number of milliseconds defined in spec
 169                                               nsITimer::TYPE_REPEATING_PRECISE);
 170   }
 171   return rv;
 172 }
 173
 174 nsresult nsVideoDecoder::StopProgress()
 175 {
 176   nsresult rv = NS_OK;
 177   if (mProgressTimer) {
 178     rv = mProgressTimer->Cancel();
 179     mProgressTimer = nsnull;
 180   }
 181   return rv;
 182 }
 183
 184 void nsVideoDecoder::SetRGBData(PRInt32 aWidth, PRInt32 aHeight, double aFramerate, unsigned char* aRGBBuffer)
 185 {
 186   if (mRGBWidth != aWidth || mRGBHeight != aHeight) {
 187     mRGBWidth = aWidth;
 188     mRGBHeight = aHeight;
 189     mSizeChanged = PR_TRUE;
 190     // Delete buffer so we'll reallocate it
 191     mRGB = nsnull;
 192   }
 193   mFramerate = aFramerate;
 194
 195   if (!mRGB)
 196     mRGB = new unsigned char[aWidth * aHeight * 4];
 197   if (mRGB && aRGBBuffer) {
 198     memcpy(mRGB.get(), aRGBBuffer, aWidth*aHeight*4);
 199   }
 200 }
 201
 202 void nsVideoDecoder::Paint(gfxContext* aContext, const gfxRect& aRect)
 203 {
 204   nsAutoLock lock(mVideoUpdateLock);
 205
 206   if (!mRGB)
 207     return;
 208
 209   if (mFramerate > 0.0) {
 210     StartInvalidating(mFramerate);
 211   }
 212
 213   /* Create a surface backed by the RGB */
 214   nsRefPtr<gfxASurface> surface =
 215     new gfxImageSurface(mRGB,
 216                         gfxIntSize(mRGBWidth, mRGBHeight),
 217                         mRGBWidth * 4,
 218                         gfxASurface::ImageFormatARGB32);
 219
 220   if (!surface)
 221     return;
 222
 223   nsRefPtr<gfxPattern> pat = new gfxPattern(surface);
 224   if (!pat)
 225     return;
 226
 227   // Make the source image fill the rectangle completely
 228   pat->SetMatrix(gfxMatrix().Scale(mRGBWidth/aRect.Width(), mRGBHeight/aRect.Height()));
 229
 230   /* Draw RGB surface onto frame */
 231   aContext->NewPath();
 232   aContext->PixelSnappedRectangleAndSetPattern(aRect, pat);
 233   aContext->Fill();
 234
 235 #ifdef DEBUG_FRAME_RATE
 236   {
 237     // Output frame rate
 238     static double last = double(PR_IntervalToMilliseconds(PR_IntervalNow()))/1000.0;
 239     double now = double(PR_IntervalToMilliseconds(PR_IntervalNow()))/1000.0;
 240     static int count = 0;
 241     count++;
 242     if (now-last > 10.0) {
 243       LOG(PR_LOG_DEBUG, ("Paint Frame Rate = %f (should be %f)\n", (float)count / (float)(now-last), mFramerate));
 244       count = 0;
 245       last = double(PR_IntervalToMilliseconds(PR_IntervalNow()))/1000.0;
 246     }
 247   }
 248 #endif
 249 }
 250
 251 void nsVideoDecoder::ElementAvailable(nsHTMLMediaElement* anElement)
 252 {
 253   mElement = anElement;
 254 }
 255
 256 void nsVideoDecoder::ElementUnavailable()
 257 {
 258   mElement = nsnull;
 259 }
 260