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|
/*****************************************************************
|
| AP4 - Descriptor Factory
|
| 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 "Ap4DescriptorFactory.h"
#include "Ap4EsDescriptor.h"
#include "Ap4ObjectDescriptor.h"
#include "Ap4DecoderConfigDescriptor.h"
#include "Ap4DecoderSpecificInfoDescriptor.h"
#include "Ap4SLConfigDescriptor.h"
#include "Ap4Ipmp.h"
#include "Ap4ByteStream.h"
/*----------------------------------------------------------------------
| AP4_DescriptorFactory::CreateDescriptorFromStream
+---------------------------------------------------------------------*/
AP4_Result
AP4_DescriptorFactory::CreateDescriptorFromStream(AP4_ByteStream& stream,
AP4_Descriptor*& descriptor)
{
AP4_Result result;
// NULL by default
descriptor = NULL;
// remember current stream offset
AP4_Position offset;
stream.Tell(offset);
// read descriptor tag
unsigned char tag;
result = stream.ReadUI08(tag);
if (AP4_FAILED(result)) {
stream.Seek(offset);
return result;
}
// read descriptor size
AP4_UI32 payload_size = 0;
unsigned int header_size = 1;
unsigned int max = 4;
unsigned char ext = 0;
do {
header_size++;
result = stream.ReadUI08(ext);
if (AP4_FAILED(result)) {
stream.Seek(offset);
return result;
}
payload_size = (payload_size<<7) + (ext&0x7F);
} while (--max && (ext&0x80));
// create the descriptor
switch (tag) {
case AP4_DESCRIPTOR_TAG_OD:
case AP4_DESCRIPTOR_TAG_MP4_OD:
descriptor = new AP4_ObjectDescriptor(stream, tag, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_IOD:
case AP4_DESCRIPTOR_TAG_MP4_IOD:
descriptor = new AP4_InitialObjectDescriptor(stream, tag, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_ES_ID_INC:
descriptor = new AP4_EsIdIncDescriptor(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_ES_ID_REF:
descriptor = new AP4_EsIdRefDescriptor(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_ES:
descriptor = new AP4_EsDescriptor(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_DECODER_CONFIG:
descriptor = new AP4_DecoderConfigDescriptor(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_DECODER_SPECIFIC_INFO:
descriptor = new AP4_DecoderSpecificInfoDescriptor(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_SL_CONFIG:
if (payload_size != 1) return AP4_ERROR_INVALID_FORMAT;
descriptor = new AP4_SLConfigDescriptor(header_size);
break;
case AP4_DESCRIPTOR_TAG_IPMP_DESCRIPTOR_POINTER:
descriptor = new AP4_IpmpDescriptorPointer(stream, header_size, payload_size);
break;
case AP4_DESCRIPTOR_TAG_IPMP_DESCRIPTOR:
descriptor = new AP4_IpmpDescriptor(stream, header_size, payload_size);
break;
default:
descriptor = new AP4_UnknownDescriptor(stream, tag, header_size, payload_size);
break;
}
// skip to the end of the descriptor
stream.Seek(offset+header_size+payload_size);
return AP4_SUCCESS;
}
|
