LCOV - code coverage report
Current view: directory - content/media/wave - nsWaveReader.h (source / functions) Found Hit Coverage
Test: app.info Lines: 4 0 0.0 %
Date: 2012-06-02 Functions: 2 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                 :  *  Matthew Gregan <kinetik@flim.org>
      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(nsWaveReader_h_)
      39                 : #define nsWaveReader_h_
      40                 : 
      41                 : #include "nsBuiltinDecoderReader.h"
      42                 : 
      43                 : class nsBuiltinDecoder;
      44                 : class nsTimeRanges;
      45                 : 
      46                 : class nsWaveReader : public nsBuiltinDecoderReader
      47                 : {
      48                 : public:
      49                 :   nsWaveReader(nsBuiltinDecoder* aDecoder);
      50                 :   ~nsWaveReader();
      51                 : 
      52                 :   virtual nsresult Init(nsBuiltinDecoderReader* aCloneDonor);
      53                 :   virtual bool DecodeAudioData();
      54                 :   virtual bool DecodeVideoFrame(bool &aKeyframeSkip,
      55                 :                                   PRInt64 aTimeThreshold);
      56                 : 
      57               0 :   virtual bool HasAudio()
      58                 :   {
      59               0 :     return true;
      60                 :   }
      61                 : 
      62               0 :   virtual bool HasVideo()
      63                 :   {
      64               0 :     return false;
      65                 :   }
      66                 : 
      67                 :   virtual nsresult ReadMetadata(nsVideoInfo* aInfo);
      68                 :   virtual nsresult Seek(PRInt64 aTime, PRInt64 aStartTime, PRInt64 aEndTime, PRInt64 aCurrentTime);
      69                 :   virtual nsresult GetBuffered(nsTimeRanges* aBuffered, PRInt64 aStartTime);
      70                 : 
      71                 : private:
      72                 :   bool ReadAll(char* aBuf, PRInt64 aSize, PRInt64* aBytesRead = nsnull);
      73                 :   bool LoadRIFFChunk();
      74                 :   bool ScanForwardUntil(PRUint32 aWantedChunk, PRUint32* aChunkSize);
      75                 :   bool LoadFormatChunk();
      76                 :   bool FindDataOffset();
      77                 : 
      78                 :   // Returns the number of seconds that aBytes represents based on the
      79                 :   // current audio parameters.  e.g.  176400 bytes is 1 second at 16-bit
      80                 :   // stereo 44.1kHz. The time is rounded to the nearest microsecond.
      81                 :   double BytesToTime(PRInt64 aBytes) const;
      82                 : 
      83                 :   // Returns the number of bytes that aTime represents based on the current
      84                 :   // audio parameters.  e.g.  1 second is 176400 bytes at 16-bit stereo
      85                 :   // 44.1kHz.
      86                 :   PRInt64 TimeToBytes(double aTime) const;
      87                 : 
      88                 :   // Rounds aBytes down to the nearest complete audio frame.  Assumes
      89                 :   // beginning of byte range is already frame aligned by caller.
      90                 :   PRInt64 RoundDownToFrame(PRInt64 aBytes) const;
      91                 :   PRInt64 GetDataLength();
      92                 :   PRInt64 GetPosition();
      93                 : 
      94                 :   /*
      95                 :     Metadata extracted from the WAVE header.  Used to initialize the audio
      96                 :     stream, and for byte<->time domain conversions.
      97                 :   */
      98                 : 
      99                 :   // Number of samples per second.  Limited to range [100, 96000] in LoadFormatChunk.
     100                 :   PRUint32 mSampleRate;
     101                 : 
     102                 :   // Number of channels.  Limited to range [1, 2] in LoadFormatChunk.
     103                 :   PRUint32 mChannels;
     104                 : 
     105                 :   // Size of a single audio frame, which includes a sample for each channel
     106                 :   // (interleaved).
     107                 :   PRUint32 mFrameSize;
     108                 : 
     109                 :   // The sample format of the PCM data.
     110                 :   nsAudioStream::SampleFormat mSampleFormat;
     111                 : 
     112                 :   // Size of PCM data stored in the WAVE as reported by the data chunk in
     113                 :   // the media.
     114                 :   PRInt64 mWaveLength;
     115                 : 
     116                 :   // Start offset of the PCM data in the media stream.  Extends mWaveLength
     117                 :   // bytes.
     118                 :   PRInt64 mWavePCMOffset;
     119                 : };
     120                 : 
     121                 : #endif

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