Bento4 MP4 SDK: Ap4LinearReader.h Source File

Bento4 MP4 SDK

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Ap4LinearReader.h

00001 /*****************************************************************
00002 |
00003 |    AP4 - File Writer
00004 |
00005 |    Copyright 2002-2008 Axiomatic Systems, LLC
00006 |
00007 |
00008 |    This file is part of Bento4/AP4 (MP4 Atom Processing Library).
00009 |
00010 |    Unless you have obtained Bento4 under a difference license,
00011 |    this version of Bento4 is Bento4|GPL.
00012 |    Bento4|GPL is free software; you can redistribute it and/or modify
00013 |    it under the terms of the GNU General Public License as published by
00014 |    the Free Software Foundation; either version 2, or (at your option)
00015 |    any later version.
00016 |
00017 |    Bento4|GPL is distributed in the hope that it will be useful,
00018 |    but WITHOUT ANY WARRANTY; without even the implied warranty of
00019 |    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00020 |    GNU General Public License for more details.
00021 |
00022 |    You should have received a copy of the GNU General Public License
00023 |    along with Bento4|GPL; see the file COPYING.  If not, write to the
00024 |    Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
00025 |    02111-1307, USA.
00026 |
00027  ****************************************************************/
00028 
00029 #ifndef _AP4_LINEAR_READER_H_
00030 #define _AP4_LINEAR_READER_H_
00031 
00032 /*----------------------------------------------------------------------
00033 |   includes
00034 +---------------------------------------------------------------------*/
00035 #include "Ap4Types.h"
00036 #include "Ap4Array.h"
00037 #include "Ap4Movie.h"
00038 #include "Ap4Sample.h"
00039 
00040 /*----------------------------------------------------------------------
00041 |   class references
00042 +---------------------------------------------------------------------*/
00043 class AP4_Track;
00044 
00045 /*----------------------------------------------------------------------
00046 |   constants
00047 +---------------------------------------------------------------------*/
00048 const unsigned int AP4_LINEAR_READER_INITIALIZED = 1;
00049 const unsigned int AP4_LINEAR_READER_FLAG_EOS    = 2;
00050 
00051 const unsigned int AP4_LINEAR_READER_DEFAULT_BUFFER_SIZE = 4096*1024;
00052 
00053 /*----------------------------------------------------------------------
00054 |   AP4_LinearReader
00055 +---------------------------------------------------------------------*/
00056 class AP4_LinearReader {
00057 public:
00058     AP4_LinearReader(AP4_Movie& movie, AP4_Size max_buffer=AP4_LINEAR_READER_DEFAULT_BUFFER_SIZE);
00059    ~AP4_LinearReader();
00060     
00061     AP4_Result EnableTrack(AP4_UI32 track_id);
00066     AP4_Result ReadNextSample(AP4_Sample&     sample, 
00067                               AP4_DataBuffer& sample_data,
00068                               AP4_UI32&       track_id);
00072     AP4_Result ReadNextSample(AP4_UI32        track_id,
00073                               AP4_Sample&     sample, 
00074                               AP4_DataBuffer& sample_data);
00075                             
00076     AP4_Result SetSampleIndex(AP4_UI32 track_id, AP4_UI32 sample_index);
00077     
00078     // accessors
00079     AP4_Size GetBufferFullness() { return m_BufferFullness; }
00080     
00081 private:
00082     class SampleBuffer {
00083     public:
00084         SampleBuffer(AP4_Sample* sample) : m_Sample(sample) {}
00085        ~SampleBuffer() { delete m_Sample; } 
00086         AP4_Sample*    m_Sample;
00087         AP4_DataBuffer m_Data;
00088     };
00089     class Tracker {
00090     public:
00091         Tracker(AP4_Track* track) :
00092             m_Eos(false),
00093             m_Track(track), 
00094             m_NextSample(NULL),
00095             m_NextSampleIndex(0) {}
00096         Tracker(const Tracker& other) : 
00097             m_Eos(other.m_Eos),
00098             m_Track(other.m_Track),
00099             m_NextSample(NULL),
00100             m_NextSampleIndex(other.m_NextSampleIndex) {} // don't copy samples
00101        ~Tracker() { m_Samples.DeleteReferences(); }
00102         bool                   m_Eos;
00103         AP4_Track*             m_Track;
00104         AP4_Sample*            m_NextSample;
00105         AP4_Ordinal            m_NextSampleIndex;
00106         AP4_List<SampleBuffer> m_Samples;
00107     };
00108     
00109     // methods
00110     Tracker*   FindTracker(AP4_UI32 track_id);
00111     AP4_Result Advance();
00112     bool       PopSample(Tracker* tracker, AP4_Sample& sample, AP4_DataBuffer& sample_data);
00113     
00114     // members
00115     AP4_Movie&          m_Movie;
00116     AP4_Array<Tracker*> m_Trackers;
00117     AP4_Size            m_BufferFullness;
00118     AP4_Size            m_BufferFullnessPeak;
00119     AP4_Size            m_MaxBufferFullness;
00120 };
00121 
00122 #endif // _AP4_LINEAR_READER_H_
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