Darwin-Streaming-Server/QTFileLib/QTAtom_stsz.cpp

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// $Id: QTAtom_stsz.cpp,v 1.1 2006/01/05 13:20:36 murata Exp $
//
// QTAtom_stsz:
//   The 'stsz' QTAtom class.


// -------------------------------------
// Includes
//
#include <stdio.h>
#include <stdlib.h>
#include "SafeStdLib.h"
#ifndef __Win32__
#include <sys/types.h>
#include <netinet/in.h>
#endif

#include "QTFile.h"

#include "QTAtom.h"
#include "QTAtom_stsz.h"
#include "OSMemory.h"


// -------------------------------------
// Constants
//
const int       stszPos_VersionFlags        =  0;
const int       stszPos_SampleSize          =  4;
const int       stszPos_NumEntries          =  8;
const int       stszPos_SampleTable         = 12;



// -------------------------------------
// Macros
//
#define DEBUG_PRINT(s) if(fDebug) qtss_printf s
#define DEEP_DEBUG_PRINT(s) if(fDeepDebug) qtss_printf s



// -------------------------------------
// Constructors and destructors
//
QTAtom_stsz::QTAtom_stsz(QTFile * File, QTFile::AtomTOCEntry * TOCEntry, Bool16 Debug, Bool16 DeepDebug)
    : QTAtom(File, TOCEntry, Debug, DeepDebug),
      fCommonSampleSize(0),
      fNumEntries(0), fSampleSizeTable(NULL), fTable(NULL)
{
}

QTAtom_stsz::~QTAtom_stsz(void)
{
    //
    // Free our variables.
    if( fSampleSizeTable != NULL )
        delete[] fSampleSizeTable;
}



// -------------------------------------
// Initialization functions
//
Bool16 QTAtom_stsz::Initialize(void)
{
    // Temporary vars
    UInt32      tempInt32;


    //
    // Parse this atom's fields.
    ReadInt32(stszPos_VersionFlags, &tempInt32);
    fVersion = (UInt8)((tempInt32 >> 24) & 0x000000ff);
    fFlags = tempInt32 & 0x00ffffff;

    ReadInt32(stszPos_SampleSize, &fCommonSampleSize);
    
    //
    // We don't need to read in the table (it doesn't exist anyway) if the
    // SampleSize field is non-zero.
    if( fCommonSampleSize != 0 )
        return true;


    //
    // Build the table..
    ReadInt32(stszPos_NumEntries, &fNumEntries);

    //
    // Validate the size of the sample table.
    if( (UInt32)(fNumEntries * 4) != (fTOCEntry.AtomDataLength - 12) )
        return false;

    //
    // Read in the sample size table.
    fSampleSizeTable = NEW char[(fNumEntries * 4) + 1];
    if( fSampleSizeTable == NULL )
        return false;
    
    if( ((PointerSizedInt)fSampleSizeTable & (PointerSizedInt)0x3) == 0)
        fTable = (UInt32 *)fSampleSizeTable;
    else
        fTable = (UInt32 *)(((PointerSizedInt)fSampleSizeTable + 4) & ~((PointerSizedInt)0x3));
    
    ReadBytes(stszPos_SampleTable, (char *)fTable, fNumEntries * 4);

    //
    // This atom has been successfully read in.
    return true;
}

Bool16 QTAtom_stsz::SampleRangeSize(UInt32 firstSampleNumber, UInt32 lastSampleNumber, UInt32 *sizePtr)
{   
    Bool16 result = false;
    

    do 
    {
        if (lastSampleNumber < firstSampleNumber) 
        {
//          qtss_printf("QTAtom_stsz::SampleRangeSize (lastSampleNumber %"_S32BITARG_" < firstSampleNumber %"_S32BITARG_") \n",lastSampleNumber, firstSampleNumber);
            break;
        }
        
        if(fCommonSampleSize) 
        { 
//          qtss_printf("QTAtom_stsz::SampleRangeSize fCommonSampleSize %"_S32BITARG_" firstSampleNumber %"_S32BITARG_" lastSampleNumber %"_S32BITARG_" *sizePtr %"_S32BITARG_"\n",fCommonSampleSize,firstSampleNumber,lastSampleNumber,*sizePtr);
            if( sizePtr != NULL ) 
                *sizePtr = fCommonSampleSize * (lastSampleNumber - firstSampleNumber + 1) ; 
                
            result =  true; 
            break;
        } 
                                    
        if(firstSampleNumber && lastSampleNumber && (lastSampleNumber<=fNumEntries) && (firstSampleNumber <= fNumEntries) ) 
        {
            if( sizePtr != NULL ) 
            {   *sizePtr = 0;
                
                for (UInt32 sampleNumber = firstSampleNumber; sampleNumber <= lastSampleNumber; sampleNumber++ ) 
                    *sizePtr += ntohl(fTable[sampleNumber-1]);
                
            }
            result =  true; 
            break;
        }
    
    } 
    while (false);
                            
    return result; 
}

// -------------------------------------
// Debugging functions
//
void QTAtom_stsz::DumpAtom(void)
{
    DEBUG_PRINT(("QTAtom_stsz::DumpAtom - Dumping atom.\n"));
    DEBUG_PRINT(("QTAtom_stsz::DumpAtom - ..Number of sample size entries: %"_S32BITARG_"\n", fNumEntries));
}

void QTAtom_stsz::DumpTable(void)
{
    //
    // Print out a header.
    qtss_printf("-- Sample Size table -----------------------------------------------------------\n");
    qtss_printf("\n");
    qtss_printf("  Sample Num   SampleSize\n");
    qtss_printf("  ----------   ----------\n");
    
    //
    // Print the table.
    for( UInt32 CurEntry = 1; CurEntry <= fNumEntries; CurEntry++ ) {
        //
        // Print out a listing.
        qtss_printf("  %10"_U32BITARG_" : %10"_U32BITARG_"\n", CurEntry, fTable[CurEntry-1]);
    }
}