Darwin-Streaming-Server/QTFileLib/QTAtom_elst.cpp

/*
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * Copyright (c) 1999-2008 Apple Inc.  All Rights Reserved.
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 *
 */
//
// QTAtom_elst:
//   The 'elst' QTAtom class.


// -------------------------------------
// Includes
//
#include <stdio.h>
#include <stdlib.h>
#include "SafeStdLib.h"
#include <string.h>

#include "QTFile.h"

#include "QTAtom.h"
#include "QTAtom_elst.h"
#include "OSMemory.h"



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



// -------------------------------------
// Constants
//
const int       elstPos_VersionFlags        =  0;
const int       elstPos_NumEdits            =  4;
const int       elstPos_EditList            =  8;

const int       elstEntryPos_Duration       =  0;
const int       elstEntryPos_MediaTime      =  4;
const int       elstEntryPos_MediaRate      =  8;

const int       elstEntryPosV1_Duration     =  0;
const int       elstEntryPosV1_MediaTime    =  8;
const int       elstEntryPosV1_MediaRate    =  16;



// -------------------------------------
// Constructors and destructors
//
QTAtom_elst::QTAtom_elst(QTFile * File, QTFile::AtomTOCEntry * TOCEntry, Bool16 Debug, Bool16 DeepDebug)
    : QTAtom(File, TOCEntry, Debug, DeepDebug),
      fNumEdits(0), fEdits(NULL),
      fFirstEditMovieTime(0)
{
}

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



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

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

    if (fVersion > 1)
    {
        DEEP_DEBUG_PRINT(("QTAtom_elst::Initialize failed. Version unsupported: %d\n",fVersion));
        return false;
    }

    ReadInt32(elstPos_NumEdits, &fNumEdits);

    //
    // Read in all of the edits.
    if( fNumEdits > 0 ) {
        DEEP_DEBUG_PRINT(("QTAtom_elst::Initialize ..%"_U32BITARG_" edits found.\n", fNumEdits));

        //
        // Allocate our ref table.
        fEdits = NEW EditListEntry[fNumEdits];
        if( fEdits == NULL )
            return false;

        //
        // Read them all in..
        for( UInt32 CurEdit = 0; CurEdit < fNumEdits; CurEdit++ ) 
        {
            
            if (0 == fVersion)
            {
                //
                // Get all of the data in this edit list entry.
                ReadInt32To64(elstPos_EditList + (CurEdit * 12) + elstEntryPos_Duration, &fEdits[CurEdit].EditDuration);
                ReadInt32To64Signed(elstPos_EditList + (CurEdit * 12) + elstEntryPos_MediaTime, &fEdits[CurEdit].StartingMediaTime);
    
                ReadInt32(elstPos_EditList + (CurEdit * 12) + elstEntryPos_MediaRate, &fEdits[CurEdit].EditMediaRate);
                
            }
            else if (1 == fVersion)
            {

                // Get all of the data in this edit list entry.
                ReadInt64(elstPos_EditList + (CurEdit * 20) + elstEntryPosV1_Duration, &fEdits[CurEdit].EditDuration);    
                ReadInt64(elstPos_EditList + (CurEdit * 20) + elstEntryPosV1_MediaTime, (UInt64*) &fEdits[CurEdit].StartingMediaTime );
                
                ReadInt32(elstPos_EditList + (CurEdit * 20) + elstEntryPosV1_MediaRate, &fEdits[CurEdit].EditMediaRate);
                
            }

            DEEP_DEBUG_PRINT(("QTAtom_elst::Initialize ..Edit #%"_U32BITARG_": Duration=%"_64BITARG_"u; MediaTime=%"_64BITARG_"d\n", CurEdit, fEdits[CurEdit].EditDuration, fEdits[CurEdit].StartingMediaTime));

            //
            // Adjust our starting media time.
            if( fEdits[CurEdit].StartingMediaTime == -1 )
                fFirstEditMovieTime = fEdits[CurEdit].EditDuration;
        }
    }

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



// -------------------------------------
// Debugging functions
//
void QTAtom_elst::DumpAtom(void)
{
    DEBUG_PRINT(("QTAtom_elst::DumpAtom - Dumping atom.\n"));
    DEBUG_PRINT(("QTAtom_elst::DumpAtom - ..Version: %d.\n", (int) fVersion));
    DEBUG_PRINT(("QTAtom_elst::DumpAtom - ..Number of edits: %"_S32BITARG_"\n", fNumEdits));
}