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|
/*****************************************************************
|
| AP4 - sidx Atoms
|
| Copyright 2002-2014 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 "Ap4SidxAtom.h"
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_SidxAtom)
/*----------------------------------------------------------------------
| AP4_SidxAtom::Create
+---------------------------------------------------------------------*/
AP4_SidxAtom*
AP4_SidxAtom::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 > 1) return NULL;
return new AP4_SidxAtom(size, version, flags, stream);
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::AP4_SidxAtom
+---------------------------------------------------------------------*/
AP4_SidxAtom::AP4_SidxAtom(AP4_UI32 reference_id,
AP4_UI32 timescale,
AP4_UI64 earliest_presentation_time,
AP4_UI64 first_offset) :
AP4_Atom(AP4_ATOM_TYPE_SIDX, AP4_FULL_ATOM_HEADER_SIZE+20, 0, 0),
m_ReferenceId(reference_id),
m_TimeScale(timescale),
m_EarliestPresentationTime(earliest_presentation_time),
m_FirstOffset(first_offset)
{
if ((earliest_presentation_time >> 32) || (first_offset >> 32)) {
m_Version = 1;
m_Size32 += 8;
}
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::AP4_SidxAtom
+---------------------------------------------------------------------*/
AP4_SidxAtom::AP4_SidxAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream) :
AP4_Atom(AP4_ATOM_TYPE_SIDX, size, version, flags)
{
stream.ReadUI32(m_ReferenceId);
stream.ReadUI32(m_TimeScale);
if (version == 0) {
AP4_UI32 earliest_presentation_time = 0;
AP4_UI32 first_offset = 0;
stream.ReadUI32(earliest_presentation_time);
stream.ReadUI32(first_offset);
m_EarliestPresentationTime = earliest_presentation_time;
m_FirstOffset = first_offset;
} else {
stream.ReadUI64(m_EarliestPresentationTime);
stream.ReadUI64(m_FirstOffset);
}
AP4_UI16 reserved;
stream.ReadUI16(reserved);
AP4_UI16 reference_count = 0;
stream.ReadUI16(reference_count);
if (size < AP4_FULL_ATOM_HEADER_SIZE+4+4+(version==0?8:16)+2+2+reference_count*12) {
// not enough space to store all references, something's wrong
return;
}
m_References.SetItemCount(reference_count);
for (unsigned int i=0; i<reference_count; i++) {
AP4_UI32 value = 0;
stream.ReadUI32(value);
m_References[i].m_ReferenceType = (value&(1<<31))?1:0;
m_References[i].m_ReferencedSize = value & 0x7FFFFFFF;
stream.ReadUI32(m_References[i].m_SubsegmentDuration);
stream.ReadUI32(value);
m_References[i].m_StartsWithSap = ((value&(1<<31)) != 0);
m_References[i].m_SapType = (AP4_UI08)((value >>28)&0x07);
m_References[i].m_SapDeltaTime = value & 0x0FFFFFFF;
}
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SidxAtom::WriteFields(AP4_ByteStream& stream)
{
stream.WriteUI32(m_ReferenceId);
stream.WriteUI32(m_TimeScale);
if (m_Version == 0) {
stream.WriteUI32((AP4_UI32)m_EarliestPresentationTime);
stream.WriteUI32((AP4_UI32)m_FirstOffset);
} else {
stream.WriteUI64(m_EarliestPresentationTime);
stream.WriteUI64(m_FirstOffset);
}
stream.WriteUI16(0);
stream.WriteUI16((AP4_UI16)m_References.ItemCount());
for (unsigned int i=0; i<m_References.ItemCount(); i++) {
stream.WriteUI32((m_References[i].m_ReferenceType<<31) |
m_References[i].m_ReferencedSize);
stream.WriteUI32(m_References[i].m_SubsegmentDuration);
stream.WriteUI32(((m_References[i].m_StartsWithSap?1:0)<<31) |
(m_References[i].m_SapType << 28) |
m_References[i].m_SapDeltaTime);
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SidxAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("reference_ID", m_ReferenceId);
inspector.AddField("timescale", m_TimeScale);
inspector.AddField("earliest_presentation_time", m_EarliestPresentationTime);
inspector.AddField("first_offset", m_FirstOffset);
if (inspector.GetVerbosity() >= 1) {
AP4_UI32 reference_count = m_References.ItemCount();
for (unsigned int i=0; i<reference_count; i++) {
char header[32];
AP4_FormatString(header, sizeof(header), "entry %04d", i);
char value[256];
AP4_FormatString(value, sizeof(value), "reference_type=%d, referenced_size=%u, subsegment_duration=%u, starts_with_SAP=%d, SAP_type=%d, SAP_delta_time=%d",
m_References[i].m_ReferenceType,
m_References[i].m_ReferencedSize,
m_References[i].m_SubsegmentDuration,
m_References[i].m_StartsWithSap,
m_References[i].m_SapType,
m_References[i].m_SapDeltaTime);
inspector.AddField(header, value);
}
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::SetReferenceCount
+---------------------------------------------------------------------*/
void
AP4_SidxAtom::SetReferenceCount(unsigned int count) {
m_Size32 -= m_References.ItemCount()*12;
m_References.SetItemCount(count);
m_Size32 += m_References.ItemCount()*12;
}
/*----------------------------------------------------------------------
| AP4_SidxAtom::GetDuration
+---------------------------------------------------------------------*/
AP4_UI64
AP4_SidxAtom::GetDuration() {
AP4_UI64 duration(0);
for (AP4_Cardinal i(0); i < m_References.ItemCount(); ++i)
duration += m_References[i].m_SubsegmentDuration;
return duration;
}
|
