96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is MPEG4IP.
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*
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* The Initial Developer of the Original Code is Cisco Systems Inc.
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* Portions created by Cisco Systems Inc. are
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* Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
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*
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* Contributor(s):
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* Dave Mackie dmackie@cisco.com
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*/
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#include "mp4common.h"
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/*
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* This is used for the 4 bit sample size below. We need the sampleCount
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* to be correct for the number of samples, but the table size needs to
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* be correct to read and write it.
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*/
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class MP4HalfSizeTableProperty : public MP4TableProperty
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{
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public:
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MP4HalfSizeTableProperty(char *name, MP4IntegerProperty *pCountProperty) :
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MP4TableProperty(name, pCountProperty) {};
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// The count is half the actual size
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u_int32_t GetCount() {
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return (m_pCountProperty->GetValue() + 1)/ 2;
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};
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void SetCount(u_int32_t count) {
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m_pCountProperty->SetValue(count * 2);
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};
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};
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MP4Stz2Atom::MP4Stz2Atom()
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: MP4Atom("stz2")
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{
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AddVersionAndFlags(); /* 0, 1 */
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AddReserved("reserved", 3); /* 2 */
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AddProperty( /* 3 */
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new MP4Integer8Property("fieldSize"));
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MP4Integer32Property* pCount =
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new MP4Integer32Property("sampleCount");
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AddProperty(pCount); /* 4 */
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}
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void MP4Stz2Atom::Read()
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{
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ReadProperties(0, 4);
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uint8_t fieldSize =
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((MP4Integer8Property *)m_pProperties[3])->GetValue();
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// uint32_t sampleCount = 0;
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MP4Integer32Property* pCount =
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(MP4Integer32Property *)m_pProperties[4];
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MP4TableProperty *pTable;
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if (fieldSize != 4) {
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pTable = new MP4TableProperty("entries", pCount);
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} else {
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// 4 bit field size uses a special table.
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pTable = new MP4HalfSizeTableProperty("entries", pCount);
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}
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AddProperty(pTable);
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if (fieldSize == 16) {
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pTable->AddProperty( /* 5/0 */
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new MP4Integer16Property("entrySize"));
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} else {
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pTable->AddProperty( /* 5/0 */
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new MP4Integer8Property("entrySize"));
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}
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ReadProperties(4);
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Skip(); // to end of atom
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}
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