79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
|
/*
|
||
|
|
* 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 dmackie@cisco.com
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "mp4common.h"
|
||
|
|
|
||
|
|
MP4StscAtom::MP4StscAtom()
|
||
|
|
: MP4Atom("stsc")
|
||
|
|
{
|
||
|
|
AddVersionAndFlags();
|
||
|
|
|
||
|
|
MP4Integer32Property* pCount =
|
||
|
|
new MP4Integer32Property("entryCount");
|
||
|
|
AddProperty(pCount);
|
||
|
|
|
||
|
|
MP4TableProperty* pTable = new MP4TableProperty("entries", pCount);
|
||
|
|
AddProperty(pTable);
|
||
|
|
|
||
|
|
pTable->AddProperty(
|
||
|
|
new MP4Integer32Property("firstChunk"));
|
||
|
|
pTable->AddProperty(
|
||
|
|
new MP4Integer32Property("samplesPerChunk"));
|
||
|
|
pTable->AddProperty(
|
||
|
|
new MP4Integer32Property("sampleDescriptionIndex"));
|
||
|
|
|
||
|
|
// As an optimization we add an implicit property to this table,
|
||
|
|
// "firstSample" that corresponds to the first sample of the firstChunk
|
||
|
|
MP4Integer32Property* pSample =
|
||
|
|
new MP4Integer32Property("firstSample");
|
||
|
|
pSample->SetImplicit();
|
||
|
|
pTable->AddProperty(pSample);
|
||
|
|
}
|
||
|
|
|
||
|
|
void MP4StscAtom::Read()
|
||
|
|
{
|
||
|
|
// Read as usual
|
||
|
|
MP4Atom::Read();
|
||
|
|
|
||
|
|
// Compute the firstSample values for later use
|
||
|
|
u_int32_t count =
|
||
|
|
((MP4Integer32Property*)m_pProperties[2])->GetValue();
|
||
|
|
|
||
|
|
MP4Integer32Property* pFirstChunk = (MP4Integer32Property*)
|
||
|
|
((MP4TableProperty*)m_pProperties[3])->GetProperty(0);
|
||
|
|
MP4Integer32Property* pSamplesPerChunk = (MP4Integer32Property*)
|
||
|
|
((MP4TableProperty*)m_pProperties[3])->GetProperty(1);
|
||
|
|
MP4Integer32Property* pFirstSample = (MP4Integer32Property*)
|
||
|
|
((MP4TableProperty*)m_pProperties[3])->GetProperty(3);
|
||
|
|
|
||
|
|
MP4SampleId sampleId = 1;
|
||
|
|
|
||
|
|
for (u_int32_t i = 0; i < count; i++) {
|
||
|
|
pFirstSample->SetValue(sampleId, i);
|
||
|
|
|
||
|
|
if (i < count - 1) {
|
||
|
|
sampleId +=
|
||
|
|
(pFirstChunk->GetValue(i+1) - pFirstChunk->GetValue(i))
|
||
|
|
* pSamplesPerChunk->GetValue(i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|