79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
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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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MP4StscAtom::MP4StscAtom()
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: MP4Atom("stsc")
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{
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AddVersionAndFlags();
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MP4Integer32Property* pCount =
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new MP4Integer32Property("entryCount");
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AddProperty(pCount);
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MP4TableProperty* pTable = new MP4TableProperty("entries", pCount);
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AddProperty(pTable);
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pTable->AddProperty(
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new MP4Integer32Property("firstChunk"));
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pTable->AddProperty(
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new MP4Integer32Property("samplesPerChunk"));
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pTable->AddProperty(
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new MP4Integer32Property("sampleDescriptionIndex"));
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// As an optimization we add an implicit property to this table,
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// "firstSample" that corresponds to the first sample of the firstChunk
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MP4Integer32Property* pSample =
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new MP4Integer32Property("firstSample");
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pSample->SetImplicit();
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pTable->AddProperty(pSample);
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}
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void MP4StscAtom::Read()
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{
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// Read as usual
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MP4Atom::Read();
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// Compute the firstSample values for later use
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u_int32_t count =
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((MP4Integer32Property*)m_pProperties[2])->GetValue();
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MP4Integer32Property* pFirstChunk = (MP4Integer32Property*)
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((MP4TableProperty*)m_pProperties[3])->GetProperty(0);
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MP4Integer32Property* pSamplesPerChunk = (MP4Integer32Property*)
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((MP4TableProperty*)m_pProperties[3])->GetProperty(1);
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MP4Integer32Property* pFirstSample = (MP4Integer32Property*)
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((MP4TableProperty*)m_pProperties[3])->GetProperty(3);
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MP4SampleId sampleId = 1;
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for (u_int32_t i = 0; i < count; i++) {
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pFirstSample->SetValue(sampleId, i);
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if (i < count - 1) {
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sampleId +=
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(pFirstChunk->GetValue(i+1) - pFirstChunk->GetValue(i))
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* pSamplesPerChunk->GetValue(i);
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}
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}
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}
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