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|
/*****************************************************************
|
| AP4 - stsz Atoms
|
| Copyright 2002-2008 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4StszAtom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_StszAtom)
/*----------------------------------------------------------------------
| AP4_StszAtom::Create
+---------------------------------------------------------------------*/
AP4_StszAtom*
AP4_StszAtom::Create(AP4_Size size, AP4_ByteStream& stream)
{
AP4_UI08 version;
AP4_UI32 flags;
if (AP4_FAILED(AP4_Atom::ReadFullHeader(stream, version, flags))) return NULL;
if (version != 0) return NULL;
return new AP4_StszAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_StszAtom::AP4_StszAtom
+---------------------------------------------------------------------*/
AP4_StszAtom::AP4_StszAtom() :
AP4_Atom(AP4_ATOM_TYPE_STSZ, AP4_FULL_ATOM_HEADER_SIZE+8, 0, 0),
m_SampleSize(0),
m_SampleCount(0)
{
}
/*----------------------------------------------------------------------
| AP4_StszAtom::AP4_StszAtom
+---------------------------------------------------------------------*/
AP4_StszAtom::AP4_StszAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_STSZ, size, version, flags)
{
stream.ReadUI32(m_SampleSize);
stream.ReadUI32(m_SampleCount);
if (m_SampleSize == 0) { // means that the samples have different sizes
AP4_Cardinal sample_count = m_SampleCount;
m_Entries.SetItemCount(sample_count);
unsigned char* buffer = new unsigned char[sample_count*4];
AP4_Result result = stream.Read(buffer, sample_count*4);
if (AP4_FAILED(result)) {
delete[] buffer;
return;
}
for (unsigned int i=0; i<sample_count; i++) {
m_Entries[i] = AP4_BytesToUInt32BE(&buffer[i*4]);
}
delete[] buffer;
}
}
/*----------------------------------------------------------------------
| AP4_StszAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StszAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
// sample size
result = stream.WriteUI32(m_SampleSize);
if (AP4_FAILED(result)) return result;
// sample count
result = stream.WriteUI32(m_SampleCount);
if (AP4_FAILED(result)) return result;
// entries if needed (the samples have different sizes)
if (m_SampleSize == 0) {
for (AP4_UI32 i=0; i<m_SampleCount; i++) {
result = stream.WriteUI32(m_Entries[i]);
if (AP4_FAILED(result)) return result;
}
}
return result;
}
/*----------------------------------------------------------------------
| AP4_StszAtom::GetSampleCount
+---------------------------------------------------------------------*/
AP4_UI32
AP4_StszAtom::GetSampleCount()
{
return m_SampleCount;
}
/*----------------------------------------------------------------------
| AP4_StszAtom::GetSampleSize
+---------------------------------------------------------------------*/
AP4_Result
AP4_StszAtom::GetSampleSize(AP4_Ordinal sample, AP4_Size& sample_size)
{
// check the sample index
if (sample > m_SampleCount || sample == 0) {
sample_size = 0;
return AP4_ERROR_OUT_OF_RANGE;
} else {
// find the size
if (m_SampleSize != 0) { // constant size
sample_size = m_SampleSize;
} else {
sample_size = m_Entries[sample - 1];
}
return AP4_SUCCESS;
}
}
/*----------------------------------------------------------------------
| AP4_StszAtom::SetSampleSize
+---------------------------------------------------------------------*/
AP4_Result
AP4_StszAtom::SetSampleSize(AP4_Ordinal sample, AP4_Size sample_size)
{
// check the sample index
if (sample > m_SampleCount || sample == 0) {
return AP4_ERROR_OUT_OF_RANGE;
} else {
if (m_Entries.ItemCount() == 0) {
// all samples must have the same size
if (sample_size != m_SampleSize) {
// not the same
if (sample == 1) {
// if this is the first sample, update the global size
m_SampleSize = sample_size;
return AP4_SUCCESS;
} else {
// can't have different sizes
return AP4_ERROR_INVALID_PARAMETERS;
}
}
} else {
// each sample has a different size
m_Entries[sample - 1] = sample_size;
}
return AP4_SUCCESS;
}
}
/*----------------------------------------------------------------------
| AP4_StszAtom::AddEntry
+---------------------------------------------------------------------*/
AP4_Result
AP4_StszAtom::AddEntry(AP4_UI32 size)
{
m_Entries.Append(size);
m_SampleCount++;
m_Size32 += 4;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_StszAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_StszAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("sample_size", m_SampleSize);
inspector.AddField("sample_count", m_Entries.ItemCount());
if (inspector.GetVerbosity() >= 2) {
char header[32];
for (AP4_Ordinal i=0; i<m_Entries.ItemCount(); i++) {
AP4_FormatString(header, sizeof(header), "entry %8d", i);
inspector.AddField(header, m_Entries[i]);
}
}
return AP4_SUCCESS;
}
|
