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|
/*****************************************************************
|
| AP4 - tfhd 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 "Ap4TfhdAtom.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_TfhdAtom)
/*----------------------------------------------------------------------
| AP4_TfhdAtom::Create
+---------------------------------------------------------------------*/
AP4_TfhdAtom*
AP4_TfhdAtom::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;
if (size < ComputeSize(flags)) return NULL;
return new AP4_TfhdAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_TfhdAtom::ComputeSize
+---------------------------------------------------------------------*/
AP4_UI32
AP4_TfhdAtom::ComputeSize(AP4_UI32 flags)
{
AP4_UI32 size = AP4_FULL_ATOM_HEADER_SIZE+4;
if (flags & AP4_TFHD_FLAG_BASE_DATA_OFFSET_PRESENT) size += 8;
if (flags & AP4_TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX_PRESENT) size += 4;
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_DURATION_PRESENT) size += 4;
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_SIZE_PRESENT) size += 4;
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT) size += 4;
return size;
}
/*----------------------------------------------------------------------
| AP4_TfhdAtom::AP4_TfhdAtom
+---------------------------------------------------------------------*/
AP4_TfhdAtom::AP4_TfhdAtom(AP4_UI32 flags,
AP4_UI32 track_id,
AP4_UI64 base_data_offset,
AP4_UI32 sample_description_index,
AP4_UI32 default_sample_duration,
AP4_UI32 default_sample_size,
AP4_UI32 default_sample_flags) :
AP4_Atom(AP4_ATOM_TYPE_TFHD, ComputeSize(flags), 0, flags),
m_TrackId(track_id),
m_BaseDataOffset(base_data_offset),
m_SampleDescriptionIndex(sample_description_index),
m_DefaultSampleDuration(default_sample_duration),
m_DefaultSampleSize(default_sample_size),
m_DefaultSampleFlags(default_sample_flags)
{
}
/*----------------------------------------------------------------------
| AP4_TfhdAtom::AP4_TfhdAtom
+---------------------------------------------------------------------*/
AP4_TfhdAtom::AP4_TfhdAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_TFHD, size, version, flags)
{
stream.ReadUI32(m_TrackId);
if (flags & AP4_TFHD_FLAG_BASE_DATA_OFFSET_PRESENT) {
stream.ReadUI64(m_BaseDataOffset);
} else {
m_BaseDataOffset = 0;
}
if (flags & AP4_TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX_PRESENT) {
stream.ReadUI32(m_SampleDescriptionIndex);
} else {
m_SampleDescriptionIndex = 1;
}
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_DURATION_PRESENT) {
stream.ReadUI32(m_DefaultSampleDuration);
} else {
m_DefaultSampleDuration = 0;
}
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_SIZE_PRESENT) {
stream.ReadUI32(m_DefaultSampleSize);
} else {
m_DefaultSampleSize = 0;
}
if (flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT) {
stream.ReadUI32(m_DefaultSampleFlags);
} else {
m_DefaultSampleFlags = 0;
}
}
/*----------------------------------------------------------------------
| AP4_TfhdAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_TfhdAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_Result result;
result = stream.WriteUI32(m_TrackId);
if (AP4_FAILED(result)) return result;
if (m_Flags & AP4_TFHD_FLAG_BASE_DATA_OFFSET_PRESENT) {
result = stream.WriteUI64(m_BaseDataOffset);
if (AP4_FAILED(result)) return result;
}
if (m_Flags & AP4_TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX_PRESENT) {
result = stream.WriteUI32(m_SampleDescriptionIndex);
if (AP4_FAILED(result)) return result;
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_DURATION_PRESENT) {
stream.WriteUI32(m_DefaultSampleDuration);
if (AP4_FAILED(result)) return result;
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_SIZE_PRESENT) {
stream.WriteUI32(m_DefaultSampleSize);
if (AP4_FAILED(result)) return result;
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT) {
stream.WriteUI32(m_DefaultSampleFlags);
if (AP4_FAILED(result)) return result;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_TfhdAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_TfhdAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("track ID", m_TrackId);
if (m_Flags & AP4_TFHD_FLAG_BASE_DATA_OFFSET_PRESENT) {
inspector.AddField("base data offset", m_BaseDataOffset);
}
if (m_Flags & AP4_TFHD_FLAG_SAMPLE_DESCRIPTION_INDEX_PRESENT) {
inspector.AddField("sample description index", m_SampleDescriptionIndex);
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_DURATION_PRESENT) {
inspector.AddField("default sample duration", m_DefaultSampleDuration);
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_SIZE_PRESENT) {
inspector.AddField("default sample size", m_DefaultSampleSize);
}
if (m_Flags & AP4_TFHD_FLAG_DEFAULT_SAMPLE_FLAGS_PRESENT) {
inspector.AddField("default sample flags", m_DefaultSampleFlags, AP4_AtomInspector::HINT_HEX );
}
return AP4_SUCCESS;
}
|
