odcommands.cpp

网络MPEG4IP流媒体开发源代码

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie		[e-mail]
 */

#include "mp4common.h"

MP4ODUpdateDescriptor::MP4ODUpdateDescriptor()
	: MP4Descriptor(MP4ODUpdateODCommandTag)
{
	// just a container for ObjectDescriptors
	AddProperty( /* 0 */
		new MP4DescriptorProperty(NULL,
			MP4FileODescrTag, 0, Required, Many));
}

MP4ODRemoveDescriptor::MP4ODRemoveDescriptor()
	: MP4Descriptor(MP4ODRemoveODCommandTag)
{
	MP4Integer32Property* pCount = 
		new MP4Integer32Property("entryCount"); 
	pCount->SetImplicit();
	AddProperty(pCount); /* 0 */

	MP4TableProperty* pTable = 
		new MP4TableProperty("entries", pCount);
	AddProperty(pTable); /* 1 */

	pTable->AddProperty( /* 1, 0 */
		new MP4BitfieldProperty("objectDescriptorId", 10));
}

void MP4ODRemoveDescriptor::Read(MP4File* pFile)
{
	// table entry count computed from descriptor size
	((MP4Integer32Property*)m_pProperties[0])->SetReadOnly(false);
	((MP4Integer32Property*)m_pProperties[0])->SetValue((m_size * 8) / 10);
	((MP4Integer32Property*)m_pProperties[0])->SetReadOnly(true);

	MP4Descriptor::Read(pFile);
}

MP4ESUpdateDescriptor::MP4ESUpdateDescriptor()
	: MP4Descriptor(MP4ESUpdateODCommandTag)
{
	AddProperty( /* 0 */
		new MP4BitfieldProperty("objectDescriptorId", 10));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("pad", 6));
	AddProperty( /* 2 */
		new MP4DescriptorProperty("esIdRefs",
			MP4ESIDRefDescrTag, 0, Required, Many));
}

// LATER might be able to combine with ESUpdateDescriptor
MP4ESRemoveDescriptor::MP4ESRemoveDescriptor()
	: MP4Descriptor(MP4ESRemoveODCommandTag)
{
	AddProperty( /* 0 */
		new MP4BitfieldProperty("objectDescriptorId", 10));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("pad", 6));
	AddProperty( /* 2 */
		new MP4DescriptorProperty("esIdRefs",
			MP4ESIDRefDescrTag, 0, Required, Many));
}

MP4Descriptor* CreateODCommand(u_int8_t tag) 
{
	MP4Descriptor* pDescriptor = NULL;

	switch (tag) {
	case MP4ODUpdateODCommandTag:
		pDescriptor = new MP4ODUpdateDescriptor();
		break;
	case MP4ODRemoveODCommandTag:
		pDescriptor = new MP4ODRemoveDescriptor();
		break;
	case MP4ESUpdateODCommandTag:
		pDescriptor = new MP4ESUpdateDescriptor();
		break;
	case MP4ESRemoveODCommandTag:
		pDescriptor = new MP4ESRemoveDescriptor();
		break;
	}
	return pDescriptor;
}