Ap4StscAtom.h

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00001 /*****************************************************************
00002 |
00003 |    AP4 - stsc Atoms 
00004 |
00005 |    Copyright 2002-2006 Gilles Boccon-Gibod & Julien Boeuf
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_STSC_ATOM_H_
00030 #define _AP4_STSC_ATOM_H_
00031 
00032 /*----------------------------------------------------------------------
00033 |   includes
00034 +---------------------------------------------------------------------*/
00035 #include "Ap4Types.h"
00036 #include "Ap4Atom.h"
00037 #include "Ap4Array.h"
00038 
00039 /*----------------------------------------------------------------------
00040 |   AP4_StscTableEntry
00041 +---------------------------------------------------------------------*/
00042 class AP4_StscTableEntry {
00043  public:
00044     AP4_StscTableEntry() : 
00045         m_FirstChunk(0), 
00046         m_FirstSample(0),
00047         m_ChunkCount(0),
00048         m_SamplesPerChunk(0), 
00049         m_SampleDescriptionIndex(0) {}
00050     AP4_StscTableEntry(AP4_Ordinal  first_chunk,
00051                        AP4_Ordinal  first_sample,
00052                        AP4_Cardinal samples_per_chunk,
00053                        AP4_Ordinal  sample_description_index) :
00054         m_FirstChunk(first_chunk),
00055         m_FirstSample(first_sample),
00056         m_ChunkCount(0),
00057         m_SamplesPerChunk(samples_per_chunk),
00058         m_SampleDescriptionIndex(sample_description_index) {}
00059     AP4_StscTableEntry(AP4_Ordinal  first_chunk,
00060                        AP4_Ordinal  first_sample,
00061                        AP4_Cardinal chunk_count,
00062                        AP4_Cardinal samples_per_chunk,
00063                        AP4_Ordinal  sample_description_index) :
00064         m_FirstChunk(first_chunk),
00065         m_FirstSample(first_sample),
00066         m_ChunkCount(chunk_count),
00067         m_SamplesPerChunk(samples_per_chunk),
00068         m_SampleDescriptionIndex(sample_description_index) {}
00069     AP4_Ordinal  m_FirstChunk;
00070     AP4_Ordinal  m_FirstSample;  // computed (not in file)
00071     AP4_Cardinal m_ChunkCount;   // computed (not in file)
00072     AP4_Cardinal m_SamplesPerChunk;
00073     AP4_Ordinal  m_SampleDescriptionIndex;
00074 };
00075 
00076 /*----------------------------------------------------------------------
00077 |   AP4_StscAtom
00078 +---------------------------------------------------------------------*/
00079 class AP4_StscAtom : public AP4_Atom
00080 {
00081 public:
00082     // class methods
00083     static AP4_StscAtom* Create(AP4_Size size, AP4_ByteStream& stream);
00084 
00085     // methods
00086     AP4_StscAtom();
00087     virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
00088     virtual AP4_Result GetChunkForSample(AP4_Ordinal   sample,
00089                                          AP4_Ordinal&  chunk,
00090                                          AP4_Ordinal&  skip,
00091                                          AP4_Ordinal&  sample_description);
00092     virtual AP4_Result AddEntry(AP4_Cardinal chunk_count,
00093                                 AP4_Cardinal samples_per_chunk,
00094                                 AP4_Ordinal  sample_description_index);
00095     virtual AP4_Result WriteFields(AP4_ByteStream& stream);
00096 
00097 private:
00098     // methods
00099     AP4_StscAtom(AP4_UI32        size, 
00100                  AP4_UI32        version,
00101                  AP4_UI32        flags,
00102                  AP4_ByteStream& stream);
00103 
00104     // members
00105     AP4_Array<AP4_StscTableEntry> m_Entries;
00106     AP4_Ordinal                   m_CachedChunkGroup;
00107 };
00108 
00109 #endif // _AP4_STSC_ATOM_H_

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