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|
/*****************************************************************
|
| AP4 - dec3 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 "Ap4Dac3Atom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
#include "Ap4Types.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_Dac3Atom)
/*----------------------------------------------------------------------
| AP4_Dac3Atom::Create
+---------------------------------------------------------------------*/
AP4_Dac3Atom*
AP4_Dac3Atom::Create(AP4_Size size, AP4_ByteStream& stream)
{
// read the raw bytes in a buffer
unsigned int payload_size = size-AP4_ATOM_HEADER_SIZE;
AP4_DataBuffer payload_data(payload_size);
AP4_Result result = stream.Read(payload_data.UseData(), payload_size);
if (AP4_FAILED(result)) return NULL;
// check the version
const AP4_UI08* payload = payload_data.GetData();
return new AP4_Dac3Atom(size, payload);
}
/*----------------------------------------------------------------------
| AP4_Dac3Atom::AP4_Dac3Atom
+---------------------------------------------------------------------*/
AP4_Dac3Atom::AP4_Dac3Atom(AP4_UI32 size, const AP4_UI08* payload) :
AP4_Atom(AP4_ATOM_TYPE_DAC3, size),
m_bsmod(0),
m_acmod(0),
m_lfeon(0)
{
// make a copy of our configuration bytes
unsigned int payload_size = size-AP4_ATOM_HEADER_SIZE;
m_RawBytes.SetData(payload, payload_size);
// sanity check
if (payload_size < 2) return;
// parse the payload
m_bsmod = (payload[1] >> 6) & 0x7;
m_acmod = (payload[1] >> 3) & 0x7;
m_lfeon = (payload[1] >> 2) & 0x1;
}
/*----------------------------------------------------------------------
| AP4_Dac3Atom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_Dac3Atom::WriteFields(AP4_ByteStream& stream)
{
return stream.Write(m_RawBytes.GetData(), m_RawBytes.GetDataSize());
}
/*----------------------------------------------------------------------
| AP4_Dac3Atom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_Dac3Atom::InspectFields(AP4_AtomInspector& inspector)
{
char value[256];
AP4_FormatString(value, sizeof(value),
"bsmod=%d, acmod=%d, lfeon=%d", (int)m_bsmod, (int)m_acmod, (int)m_lfeon);
inspector.AddField("params", value);
return AP4_SUCCESS;
}
AP4_UI08 AP4_Dac3Atom::GetChannels() const
{
static const AP4_UI08 CC[] = { 2, 1, 2, 3, 3, 4, 4, 5 };
return CC[m_acmod] + m_lfeon;
}
|
