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|
/*****************************************************************
|
| AP4 - ohdr 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 "Ap4Utils.h"
#include "Ap4OhdrAtom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_OhdrAtom)
/*----------------------------------------------------------------------
| AP4_OhdrAtom::Create
+---------------------------------------------------------------------*/
AP4_OhdrAtom*
AP4_OhdrAtom::Create(AP4_Size size,
AP4_ByteStream& stream,
AP4_AtomFactory& atom_factory)
{
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_OhdrAtom(size, version, flags, stream, atom_factory);
}
/*----------------------------------------------------------------------
| AP4_OhdrAtom::AP4_OhdrAtom
+---------------------------------------------------------------------*/
AP4_OhdrAtom::AP4_OhdrAtom(AP4_UI08 encryption_method,
AP4_UI08 padding_scheme,
AP4_UI64 plaintext_length,
const char* content_id,
const char* rights_issuer_url,
const AP4_Byte* textual_headers,
AP4_Size textual_headers_size) :
AP4_ContainerAtom(AP4_ATOM_TYPE_OHDR, (AP4_UI32)0, (AP4_UI32)0),
m_EncryptionMethod(encryption_method),
m_PaddingScheme(padding_scheme),
m_PlaintextLength(plaintext_length),
m_ContentId(content_id),
m_RightsIssuerUrl(rights_issuer_url),
m_TextualHeaders(textual_headers, textual_headers_size)
{
m_Size32 += 1+1+8+2+2+2+m_ContentId.GetLength()+m_RightsIssuerUrl.GetLength()+textual_headers_size;
}
/*----------------------------------------------------------------------
| AP4_OhdrAtom::AP4_OhdrAtom
+---------------------------------------------------------------------*/
AP4_OhdrAtom::AP4_OhdrAtom(AP4_UI32 size,
AP4_UI08 version,
AP4_UI32 flags,
AP4_ByteStream& stream,
AP4_AtomFactory& atom_factory) :
AP4_ContainerAtom(AP4_ATOM_TYPE_OHDR, size, false, version, flags)
{
// encryption method
stream.ReadUI08(m_EncryptionMethod);
// padding scheme
stream.ReadUI08(m_PaddingScheme);
// plaintext length
stream.ReadUI64(m_PlaintextLength);
// string lengths
AP4_UI16 content_id_length;
AP4_UI16 rights_issuer_url_length;
AP4_UI16 textual_headers_length;
stream.ReadUI16(content_id_length);
stream.ReadUI16(rights_issuer_url_length);
stream.ReadUI16(textual_headers_length);
// content id
char* buffer = new char[content_id_length];
stream.Read(buffer, content_id_length);
m_ContentId.Assign(buffer, content_id_length);
delete[] buffer;
// rights issuer url
buffer = new char[rights_issuer_url_length];
stream.Read(buffer, rights_issuer_url_length);
m_RightsIssuerUrl.Assign(buffer, rights_issuer_url_length);
delete[] buffer;
// textual headers
buffer = new char[textual_headers_length];
stream.Read(buffer, textual_headers_length);
m_TextualHeaders.SetData((AP4_Byte*)buffer, textual_headers_length);
delete[] buffer;
// read the children
AP4_Size bytes_used = AP4_FULL_ATOM_HEADER_SIZE+1+1+8+2+2+2+content_id_length+rights_issuer_url_length+textual_headers_length;
if (bytes_used <= size) {
ReadChildren(atom_factory, stream, size-bytes_used);
}
}
/*----------------------------------------------------------------------
| AP4_OhdrAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OhdrAtom::WriteFields(AP4_ByteStream& stream)
{
AP4_CHECK(stream.WriteUI08(m_EncryptionMethod));
AP4_CHECK(stream.WriteUI08(m_PaddingScheme));
AP4_CHECK(stream.WriteUI64(m_PlaintextLength));
AP4_CHECK(stream.WriteUI16((AP4_UI16)m_ContentId.GetLength()));
AP4_CHECK(stream.WriteUI16((AP4_UI16)m_RightsIssuerUrl.GetLength()));
AP4_CHECK(stream.WriteUI16((AP4_UI16)m_TextualHeaders.GetDataSize()));
AP4_CHECK(stream.Write(m_ContentId.GetChars(), m_ContentId.GetLength()));
AP4_CHECK(stream.Write(m_RightsIssuerUrl.GetChars(), m_RightsIssuerUrl.GetLength()));
AP4_CHECK(stream.Write(m_TextualHeaders.GetData(), m_TextualHeaders.GetDataSize()));
// write the children
return m_Children.Apply(AP4_AtomListWriter(stream));
}
/*----------------------------------------------------------------------
| AP4_OhdrAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_OhdrAtom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("encryption_method", m_EncryptionMethod);
inspector.AddField("padding_scheme", m_PaddingScheme);
inspector.AddField("plaintext_length", (AP4_UI32)m_PlaintextLength);
inspector.AddField("content_id", m_ContentId.GetChars());
inspector.AddField("rights_issuer_url", m_RightsIssuerUrl.GetChars());
{
AP4_DataBuffer output_buffer;
AP4_Result result;
result = output_buffer.Reserve(1+m_TextualHeaders.GetDataSize());
if (AP4_FAILED(result)) {
inspector.AddField("textual_headers",
m_TextualHeaders.UseData(),
m_TextualHeaders.GetDataSize(),
AP4_AtomInspector::HINT_HEX);
} else {
AP4_Size data_len = m_TextualHeaders.GetDataSize();
AP4_Byte* textual_headers_string;
AP4_Byte* curr;
output_buffer.SetData((const AP4_Byte*)m_TextualHeaders.GetData(), m_TextualHeaders.GetDataSize());
curr = textual_headers_string = output_buffer.UseData();
textual_headers_string[m_TextualHeaders.GetDataSize()] = '\0';
while(curr < textual_headers_string+data_len) {
if ('\0' == *curr) {
*curr = '\n';
}
curr++;
}
inspector.AddField("textual_headers", (const char*) textual_headers_string);
}
}
return InspectChildren(inspector);
}
/*----------------------------------------------------------------------
| AP4_OhdrAtom::Clone
+---------------------------------------------------------------------*/
AP4_Atom*
AP4_OhdrAtom::Clone()
{
AP4_OhdrAtom* clone;
clone = new AP4_OhdrAtom(m_EncryptionMethod,
m_PaddingScheme,
m_PlaintextLength,
m_ContentId.GetChars(),
m_RightsIssuerUrl.GetChars(),
m_TextualHeaders.GetData(),
m_TextualHeaders.GetDataSize());
AP4_List<AP4_Atom>::Item* child_item = m_Children.FirstItem();
while (child_item) {
AP4_Atom* child_clone = child_item->GetData()->Clone();
if (child_clone) clone->AddChild(child_clone);
child_item = child_item->GetNext();
}
return clone;
}
|
