LCOV - app.info - content/media/wave/nsWaveReader.h

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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