LCOV - code coverage report
Current view: directory - content/media - nsAudioAvailableEventManager.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 103 0 0.0 %
Date: 2012-06-02 Functions: 13 0 0.0 %

       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 Foundation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *  David Humphrey <david.humphrey@senecac.on.ca>
      24                 :  *  Yury Delendik
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #include "nsTArray.h"
      41                 : #include "nsAudioAvailableEventManager.h"
      42                 : #include "VideoUtils.h"
      43                 : 
      44                 : static const nsTArray< nsCOMPtr<nsIRunnable> >::size_type MAX_PENDING_EVENTS = 100;
      45                 : 
      46                 : using namespace mozilla;
      47                 : 
      48                 : class nsAudioAvailableEventRunner : public nsRunnable
      49                 : {
      50                 : private:
      51                 :   nsCOMPtr<nsBuiltinDecoder> mDecoder;
      52                 :   nsAutoArrayPtr<float> mFrameBuffer;
      53                 : public:
      54               0 :   nsAudioAvailableEventRunner(nsBuiltinDecoder* aDecoder, float* aFrameBuffer,
      55                 :                               PRUint32 aFrameBufferLength, float aTime) :
      56                 :     mDecoder(aDecoder),
      57                 :     mFrameBuffer(aFrameBuffer),
      58                 :     mFrameBufferLength(aFrameBufferLength),
      59               0 :     mTime(aTime)
      60                 :   {
      61               0 :     MOZ_COUNT_CTOR(nsAudioAvailableEventRunner);
      62               0 :   }
      63                 : 
      64               0 :   ~nsAudioAvailableEventRunner() {
      65               0 :     MOZ_COUNT_DTOR(nsAudioAvailableEventRunner);
      66               0 :   }
      67                 : 
      68               0 :   NS_IMETHOD Run()
      69                 :   {
      70               0 :     mDecoder->AudioAvailable(mFrameBuffer.forget(), mFrameBufferLength, mTime);
      71               0 :     return NS_OK;
      72                 :   }
      73                 : 
      74                 :   const PRUint32 mFrameBufferLength;
      75                 : 
      76                 :   // Start time of the buffer data (in seconds).
      77                 :   const float mTime;
      78                 : };
      79                 : 
      80                 : 
      81               0 : nsAudioAvailableEventManager::nsAudioAvailableEventManager(nsBuiltinDecoder* aDecoder) :
      82                 :   mDecoder(aDecoder),
      83               0 :   mSignalBuffer(new float[mDecoder->GetFrameBufferLength()]),
      84               0 :   mSignalBufferLength(mDecoder->GetFrameBufferLength()),
      85                 :   mNewSignalBufferLength(mSignalBufferLength),
      86                 :   mSignalBufferPosition(0),
      87                 :   mReentrantMonitor("media.audioavailableeventmanager"),
      88               0 :   mHasListener(false)
      89                 : {
      90               0 :   MOZ_COUNT_CTOR(nsAudioAvailableEventManager);
      91               0 : }
      92                 : 
      93               0 : nsAudioAvailableEventManager::~nsAudioAvailableEventManager()
      94                 : {
      95               0 :   MOZ_COUNT_DTOR(nsAudioAvailableEventManager);
      96               0 : }
      97                 : 
      98               0 : void nsAudioAvailableEventManager::Init(PRUint32 aChannels, PRUint32 aRate)
      99                 : {
     100               0 :   NS_ASSERTION(aChannels != 0 && aRate != 0, "Audio metadata not known.");
     101               0 :   mSamplesPerSecond = static_cast<float>(aChannels * aRate);
     102               0 : }
     103                 : 
     104               0 : void nsAudioAvailableEventManager::DispatchPendingEvents(PRUint64 aCurrentTime)
     105                 : {
     106               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     107                 : 
     108               0 :   if (!mHasListener) {
     109                 :     return;
     110                 :   }
     111                 : 
     112               0 :   while (mPendingEvents.Length() > 0) {
     113                 :     nsAudioAvailableEventRunner* e =
     114               0 :       (nsAudioAvailableEventRunner*)mPendingEvents[0].get();
     115               0 :     if (e->mTime * USECS_PER_S > aCurrentTime) {
     116               0 :       break;
     117                 :     }
     118               0 :     nsCOMPtr<nsIRunnable> event = mPendingEvents[0];
     119               0 :     mPendingEvents.RemoveElementAt(0);
     120               0 :     NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
     121                 :   }
     122                 : }
     123                 : 
     124               0 : void nsAudioAvailableEventManager::QueueWrittenAudioData(AudioDataValue* aAudioData,
     125                 :                                                          PRUint32 aAudioDataLength,
     126                 :                                                          PRUint64 aEndTimeSampleOffset)
     127                 : {
     128               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     129                 : 
     130               0 :   if (!mHasListener) {
     131                 :     return;
     132                 :   }
     133                 : 
     134               0 :   PRUint32 currentBufferSize = mNewSignalBufferLength;
     135               0 :   if (currentBufferSize == 0) {
     136               0 :     NS_WARNING("Decoder framebuffer length not set.");
     137                 :     return;
     138                 :   }
     139                 : 
     140               0 :   if (!mSignalBuffer ||
     141                 :       (mSignalBufferPosition == 0 && mSignalBufferLength != currentBufferSize)) {
     142               0 :     if (!mSignalBuffer || (mSignalBufferLength < currentBufferSize)) {
     143                 :       // Only resize if buffer is empty or smaller.
     144               0 :       mSignalBuffer = new float[currentBufferSize];
     145                 :     }
     146               0 :     mSignalBufferLength = currentBufferSize;
     147                 :   }
     148               0 :   AudioDataValue* audioData = aAudioData;
     149               0 :   PRUint32 audioDataLength = aAudioDataLength;
     150               0 :   PRUint32 signalBufferTail = mSignalBufferLength - mSignalBufferPosition;
     151                 : 
     152                 :   // Group audio samples into optimal size for event dispatch, and queue.
     153               0 :   while (signalBufferTail <= audioDataLength) {
     154               0 :     float time = 0.0;
     155                 :     // Guard against unsigned number overflow during first frame time calculation.
     156               0 :     if (aEndTimeSampleOffset > mSignalBufferPosition + audioDataLength) {
     157                 :       time = (aEndTimeSampleOffset - mSignalBufferPosition - audioDataLength) / 
     158               0 :              mSamplesPerSecond;
     159                 :     }
     160                 : 
     161                 :     // Fill the signalBuffer.
     162                 :     PRUint32 i;
     163               0 :     float *signalBuffer = mSignalBuffer.get() + mSignalBufferPosition;
     164               0 :     for (i = 0; i < signalBufferTail; ++i) {
     165               0 :       signalBuffer[i] = MOZ_CONVERT_AUDIO_SAMPLE(audioData[i]);
     166                 :     }
     167               0 :     audioData += signalBufferTail;
     168               0 :     audioDataLength -= signalBufferTail;
     169                 : 
     170               0 :     if (mPendingEvents.Length() > 0) {
     171                 :       // Check last event timecode to make sure that all queued events
     172                 :       // are in non-descending sequence.
     173                 :       nsAudioAvailableEventRunner* lastPendingEvent =
     174               0 :         (nsAudioAvailableEventRunner*)mPendingEvents[mPendingEvents.Length() - 1].get();
     175               0 :       if (lastPendingEvent->mTime > time) {
     176                 :         // Clear the queue to start a fresh sequence.
     177               0 :         mPendingEvents.Clear();
     178               0 :       } else if (mPendingEvents.Length() >= MAX_PENDING_EVENTS) {
     179               0 :         NS_WARNING("Hit audio event queue max.");
     180               0 :         mPendingEvents.RemoveElementsAt(0, mPendingEvents.Length() - MAX_PENDING_EVENTS + 1);
     181                 :       }
     182                 :     }
     183                 : 
     184                 :     // Inform the element that we've written audio data.
     185                 :     nsCOMPtr<nsIRunnable> event =
     186               0 :       new nsAudioAvailableEventRunner(mDecoder, mSignalBuffer.forget(),
     187               0 :                                       mSignalBufferLength, time);
     188               0 :     mPendingEvents.AppendElement(event);
     189                 : 
     190                 :     // Reset the buffer
     191               0 :     mSignalBufferLength = currentBufferSize;
     192               0 :     mSignalBuffer = new float[currentBufferSize];
     193               0 :     mSignalBufferPosition = 0;
     194               0 :     signalBufferTail = currentBufferSize;
     195                 :     NS_ASSERTION(audioDataLength >= 0, "Past new signal data length.");
     196                 :   }
     197                 : 
     198               0 :   NS_ASSERTION(mSignalBufferPosition + audioDataLength < mSignalBufferLength,
     199                 :                "Intermediate signal buffer must fit at least one more item.");
     200                 : 
     201               0 :   if (audioDataLength > 0) {
     202                 :     // Add data to the signalBuffer.
     203                 :     PRUint32 i;
     204               0 :     float *signalBuffer = mSignalBuffer.get() + mSignalBufferPosition;
     205               0 :     for (i = 0; i < audioDataLength; ++i) {
     206               0 :       signalBuffer[i] = MOZ_CONVERT_AUDIO_SAMPLE(audioData[i]);
     207                 :     }
     208               0 :     mSignalBufferPosition += audioDataLength;
     209                 :   }
     210                 : }
     211                 : 
     212               0 : void nsAudioAvailableEventManager::Clear()
     213                 : {
     214               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     215                 : 
     216               0 :   mPendingEvents.Clear();
     217               0 :   mSignalBufferPosition = 0;
     218               0 : }
     219                 : 
     220               0 : void nsAudioAvailableEventManager::Drain(PRUint64 aEndTime)
     221                 : {
     222               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     223                 : 
     224               0 :   if (!mHasListener) {
     225                 :     return;
     226                 :   }
     227                 : 
     228                 :   // Force all pending events to go now.
     229               0 :   for (PRUint32 i = 0; i < mPendingEvents.Length(); ++i) {
     230               0 :     nsCOMPtr<nsIRunnable> event = mPendingEvents[i];
     231               0 :     NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
     232                 :   }
     233               0 :   mPendingEvents.Clear();
     234                 : 
     235                 :   // If there is anything left in the signal buffer, put it in an event and fire.
     236               0 :   if (0 == mSignalBufferPosition)
     237                 :     return;
     238                 : 
     239                 :   // Zero-pad the end of the signal buffer so it's complete.
     240               0 :   memset(mSignalBuffer.get() + mSignalBufferPosition, 0,
     241               0 :          (mSignalBufferLength - mSignalBufferPosition) * sizeof(float));
     242                 : 
     243                 :   // Force this last event to go now.
     244                 :   float time = (aEndTime / static_cast<float>(USECS_PER_S)) - 
     245               0 :                (mSignalBufferPosition / mSamplesPerSecond);
     246                 :   nsCOMPtr<nsIRunnable> lastEvent =
     247               0 :     new nsAudioAvailableEventRunner(mDecoder, mSignalBuffer.forget(),
     248               0 :                                     mSignalBufferLength, time);
     249               0 :   NS_DispatchToMainThread(lastEvent, NS_DISPATCH_NORMAL);
     250                 : 
     251               0 :   mSignalBufferPosition = 0;
     252                 : }
     253                 : 
     254               0 : void nsAudioAvailableEventManager::SetSignalBufferLength(PRUint32 aLength)
     255                 : {
     256               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     257                 : 
     258               0 :   mNewSignalBufferLength = aLength;
     259               0 : }
     260                 : 
     261               0 : void nsAudioAvailableEventManager::NotifyAudioAvailableListener()
     262                 : {
     263               0 :   ReentrantMonitorAutoEnter mon(mReentrantMonitor);
     264                 : 
     265               0 :   mHasListener = true;
     266               0 : }

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