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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 "Ap4Dec3Atom.h"
#include "Ap4AtomFactory.h"
#include "Ap4Utils.h"
#include "Ap4Types.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_Dec3Atom)
/*----------------------------------------------------------------------
| AP4_Dec3Atom::Create
+---------------------------------------------------------------------*/
AP4_Dec3Atom*
AP4_Dec3Atom::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_Dec3Atom(size, payload);
}
/*----------------------------------------------------------------------
| AP4_Dec3Atom::AP4_Dec3Atom
+---------------------------------------------------------------------*/
AP4_Dec3Atom::AP4_Dec3Atom(AP4_UI32 size, const AP4_UI08* payload) :
AP4_Atom(AP4_ATOM_TYPE_DEC3, size),
m_DataRate(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_DataRate = (payload[0]<<5)|(payload[1]>>3);
unsigned int substream_count = 1+(payload[1]&7);
payload += 2;
payload_size -= 2;
m_SubStreams.SetItemCount(substream_count);
for (unsigned int i=0; i<substream_count; i++) {
if (payload_size < 3) {
m_SubStreams[i].fscod = 0;
m_SubStreams[i].bsid = 0;
m_SubStreams[i].bsmod = 0;
m_SubStreams[i].acmod = 0;
m_SubStreams[i].lfeon = 0;
m_SubStreams[i].num_dep_sub = 0;
m_SubStreams[i].chan_loc = 0;
continue;
}
m_SubStreams[i].fscod = (payload[0]>>6) & 0x3;
m_SubStreams[i].bsid = (payload[0]>>1) & 0x1F;
m_SubStreams[i].bsmod = (payload[0]<<4 | payload[1]>>4) & 0x1F;
m_SubStreams[i].acmod = (payload[1]>>1) & 0x7;
m_SubStreams[i].lfeon = (payload[1] ) & 0x1;
m_SubStreams[i].num_dep_sub = (payload[2]>>1) & 0xF;
if (m_SubStreams[i].num_dep_sub) {
m_SubStreams[i].chan_loc = (payload[2]<<7 | payload[3]) & 0x1F;
payload += 4;
payload_size -= 4;
} else {
m_SubStreams[i].chan_loc = 0;
payload += 3;
payload_size -= 3;
}
}
}
/*----------------------------------------------------------------------
| AP4_Dec3Atom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_Dec3Atom::WriteFields(AP4_ByteStream& stream)
{
return stream.Write(m_RawBytes.GetData(), m_RawBytes.GetDataSize());
}
/*----------------------------------------------------------------------
| AP4_Dec3Atom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_Dec3Atom::InspectFields(AP4_AtomInspector& inspector)
{
inspector.AddField("data_rate", m_DataRate);
for (unsigned int i=0; i<m_SubStreams.ItemCount(); i++) {
char name[16];
char value[256];
AP4_FormatString(name, sizeof(name), "[%02d]", i);
AP4_FormatString(value, sizeof(value),
"fscod=%d, bsid=%d, bsmod=%d, acmod=%d, lfeon=%d, num_dep_sub=%d, chan_loc=%d",
m_SubStreams[i].fscod,
m_SubStreams[i].bsid,
m_SubStreams[i].bsmod,
m_SubStreams[i].acmod,
m_SubStreams[i].lfeon,
m_SubStreams[i].num_dep_sub,
m_SubStreams[i].chan_loc);
inspector.AddField(name, value);
}
return AP4_SUCCESS;
}
|
