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* 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
* 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
namespace mp4v2 {
namespace impl {
class MP4Descriptor {
MP4Descriptor(MP4Atom& parentAtom, uint8_t tag = 0);
virtual ~MP4Descriptor();
uint8_t GetTag() {
return m_tag;
void SetTag(uint8_t tag) {
m_tag = tag;
void AddProperty(MP4Property* pProperty);
virtual void Generate();
virtual void Read(MP4File& file);
virtual void Write(MP4File& file);
virtual void Dump(uint8_t indent, bool dumpImplicits);
MP4Property* GetProperty(uint32_t index) {
return m_pProperties[index];
// use with extreme caution
void SetProperty(uint32_t index, MP4Property* pProperty) {
m_pProperties[index] = pProperty;
bool FindProperty( const char* name, MP4Property** ppProperty,
uint32_t* pIndex = NULL)
return FindContainedProperty(name, ppProperty, pIndex);
void WriteToMemory(MP4File& file,
uint8_t** ppBytes, uint64_t* pNumBytes);
void SetReadMutate(uint32_t propIndex) {
m_readMutatePoint = propIndex;
void ReadHeader(MP4File& file);
void ReadProperties(MP4File& file,
uint32_t startIndex = 0, uint32_t count = 0xFFFFFFFF);
virtual void Mutate() {
// default is a no-op
bool FindContainedProperty(const char* name,
MP4Property** ppProperty, uint32_t* pIndex);
uint8_t GetDepth();
MP4Atom& m_parentAtom;
uint8_t m_tag;
uint64_t m_start;
uint32_t m_size;
MP4PropertyArray m_pProperties;
uint32_t m_readMutatePoint;
MP4Descriptor ( const MP4Descriptor &src );
MP4Descriptor &operator= ( const MP4Descriptor &src );
} // namespace mp4v2::impl