Bento4/Source/C++/Core/Ap4StcoAtom.cpp

/*****************************************************************
|
|    AP4 - stco Atoms 
|
|    Copyright 2002-2008 Axiomatic Systems, LLC
|
|
|    This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
|    Unless you have obtained Bento4 under a difference license,
|    this version of Bento4 is Bento4|GPL.
|    Bento4|GPL is free software; you can redistribute it and/or modify
|    it under the terms of the GNU General Public License as published by
|    the Free Software Foundation; either version 2, or (at your option)
|    any later version.
|
|    Bento4|GPL is distributed in the hope that it will be useful,
|    but WITHOUT ANY WARRANTY; without even the implied warranty of
|    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
|    GNU General Public License for more details.
|
|    You should have received a copy of the GNU General Public License
|    along with Bento4|GPL; see the file COPYING.  If not, write to the
|    Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|    02111-1307, USA.
|
 ****************************************************************/

/*----------------------------------------------------------------------
|   includes
+---------------------------------------------------------------------*/
#include "Ap4StcoAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"

/*----------------------------------------------------------------------
|   dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_StcoAtom)

/*----------------------------------------------------------------------
|   AP4_StcoAtom::Create
+---------------------------------------------------------------------*/
AP4_StcoAtom*
AP4_StcoAtom::Create(AP4_Size size, AP4_ByteStream& stream)
{
    AP4_UI08 version;
    AP4_UI32 flags;
    if (size < AP4_FULL_ATOM_HEADER_SIZE) return NULL;
    if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
    if (version != 0) return NULL;
    return new AP4_StcoAtom(size, version, flags, stream);
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::AP4_StcoAtom
+---------------------------------------------------------------------*/
AP4_StcoAtom::AP4_StcoAtom(AP4_UI32* entries, AP4_UI32 entry_count) :
AP4_Atom(AP4_ATOM_TYPE_STCO,  
         AP4_FULL_ATOM_HEADER_SIZE+4+entry_count*4,
         0, 0),
         m_Entries(new AP4_UI32[entry_count]),
         m_EntryCount(entry_count)
{
    AP4_CopyMemory(m_Entries, entries, m_EntryCount*4);
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::AP4_StcoAtom
+---------------------------------------------------------------------*/
AP4_StcoAtom::AP4_StcoAtom(AP4_UI32        size, 
                           AP4_UI08        version,
                           AP4_UI32        flags,
                           AP4_ByteStream& stream) :
    AP4_Atom(AP4_ATOM_TYPE_STCO, size, version, flags)
{
    stream.ReadUI32(m_EntryCount);
    if (m_EntryCount > (size-AP4_FULL_ATOM_HEADER_SIZE-4)/4) {
        m_EntryCount = (size-AP4_FULL_ATOM_HEADER_SIZE-4)/4;
    }
    m_Entries = new AP4_UI32[m_EntryCount];
    unsigned char* buffer = new unsigned char[m_EntryCount*4];
    AP4_Result result = stream.Read(buffer, m_EntryCount*4);
    if (AP4_FAILED(result)) {
        delete[] buffer;
        return;
    }
    for (AP4_Ordinal i=0; i<m_EntryCount; i++) {
        m_Entries[i] = AP4_BytesToUInt32BE(&buffer[i*4]);
    }
    delete[] buffer;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::~AP4_StcoAtom
+---------------------------------------------------------------------*/
AP4_StcoAtom::~AP4_StcoAtom()
{
    delete[] m_Entries;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::GetChunkOffset
+---------------------------------------------------------------------*/
AP4_Result
AP4_StcoAtom::GetChunkOffset(AP4_Ordinal chunk, AP4_UI32& chunk_offset)
{
    // check the bounds
    if (chunk > m_EntryCount || chunk == 0) {
        return AP4_ERROR_OUT_OF_RANGE;
    }

    // get the chunk offset
    chunk_offset = m_Entries[chunk - 1]; // m_Entries is zero index based

    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::SetChunkOffset
+---------------------------------------------------------------------*/
AP4_Result
AP4_StcoAtom::SetChunkOffset(AP4_Ordinal chunk, AP4_UI32 chunk_offset)
{
    // check the bounds
    if (chunk > m_EntryCount || chunk == 0) {
        return AP4_ERROR_OUT_OF_RANGE;
    }

    // get the chunk offset
    m_Entries[chunk - 1] = chunk_offset; // m_Entries is zero index based

    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::AdjustChunkOffsets
+---------------------------------------------------------------------*/
AP4_Result
AP4_StcoAtom::AdjustChunkOffsets(int delta)
{
    for (AP4_Ordinal i=0; i<m_EntryCount; i++) {
        m_Entries[i] += delta;
    }

    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StcoAtom::WriteFields(AP4_ByteStream& stream)
{
    AP4_Result result;

    // entry count
    result = stream.WriteUI32(m_EntryCount);
    if (AP4_FAILED(result)) return result;

    // entries
    for (AP4_Ordinal i=0; i<m_EntryCount; i++) {
        result = stream.WriteUI32(m_Entries[i]);
        if (AP4_FAILED(result)) return result;
    }

    return result;
}

/*----------------------------------------------------------------------
|   AP4_StcoAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StcoAtom::InspectFields(AP4_AtomInspector& inspector)
{
    inspector.AddField("entry_count", m_EntryCount);
    if (inspector.GetVerbosity() >= 1) {
        char header[32];
        for (AP4_Ordinal i=0; i<m_EntryCount; i++) {
            AP4_FormatString(header, sizeof(header), "entry %8d", i);
            inspector.AddField(header, m_Entries[i]);
        }
    }
    
    return AP4_SUCCESS;
}