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|
/*****************************************************************
|
| AP4 - DecoderConfig Descriptors
|
| 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 "Ap4DecoderConfigDescriptor.h"
#include "Ap4DescriptorFactory.h"
#include "Ap4Utils.h"
#include "Ap4ByteStream.h"
#include "Ap4Atom.h"
/*----------------------------------------------------------------------
| dynamic cast support
+---------------------------------------------------------------------*/
AP4_DEFINE_DYNAMIC_CAST_ANCHOR(AP4_DecoderConfigDescriptor)
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::AP4_DecoderConfigDescriptor
+---------------------------------------------------------------------*/
AP4_DecoderConfigDescriptor::AP4_DecoderConfigDescriptor(
AP4_UI08 stream_type,
AP4_UI08 oti,
AP4_UI32 buffer_size,
AP4_UI32 max_bitrate,
AP4_UI32 avg_bitrate,
AP4_DecoderSpecificInfoDescriptor* dsi) :
AP4_Descriptor(AP4_DESCRIPTOR_TAG_DECODER_CONFIG, 2, 13),
m_StreamType(stream_type),
m_ObjectTypeIndication(oti),
m_UpStream(false),
m_BufferSize(buffer_size),
m_MaxBitrate(max_bitrate),
m_AverageBitrate(avg_bitrate)
{
if (dsi) {
m_SubDescriptors.Add(dsi);
m_PayloadSize += dsi->GetSize();
m_HeaderSize = MinHeaderSize(m_PayloadSize);
}
}
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::AP4_DecoderConfigDescriptor
+---------------------------------------------------------------------*/
AP4_DecoderConfigDescriptor::AP4_DecoderConfigDescriptor(
AP4_ByteStream& stream, AP4_Size header_size, AP4_Size payload_size) :
AP4_Descriptor(AP4_DESCRIPTOR_TAG_DECODER_CONFIG,
header_size,
payload_size)
{
// record the start position
AP4_Position start;
stream.Tell(start);
// read descriptor fields
stream.ReadUI08(m_ObjectTypeIndication);
unsigned char bits;
stream.ReadUI08(bits);
m_StreamType = (bits>>2)&0x3F;
m_UpStream = bits&2 ? true:false;
stream.ReadUI24(m_BufferSize);
stream.ReadUI32(m_MaxBitrate);
stream.ReadUI32(m_AverageBitrate);
// read other descriptors
AP4_SubStream* substream = new AP4_SubStream(stream, start+13, payload_size-13);
AP4_Descriptor* descriptor = NULL;
while (AP4_DescriptorFactory::CreateDescriptorFromStream(*substream,
descriptor)
== AP4_SUCCESS) {
m_SubDescriptors.Add(descriptor);
}
substream->Release();
}
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::~AP4_DecoderConfigDescriptor
+---------------------------------------------------------------------*/
AP4_DecoderConfigDescriptor::~AP4_DecoderConfigDescriptor()
{
m_SubDescriptors.DeleteReferences();
}
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_DecoderConfigDescriptor::WriteFields(AP4_ByteStream& stream)
{
stream.WriteUI08(m_ObjectTypeIndication);
AP4_UI08 bits = (m_StreamType<<2) | (m_UpStream? 2 : 0) | 1;
stream.WriteUI08(bits);
stream.WriteUI24(m_BufferSize);
stream.WriteUI32(m_MaxBitrate);
stream.WriteUI32(m_AverageBitrate);
m_SubDescriptors.Apply(AP4_DescriptorListWriter(stream));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::Inspect
+---------------------------------------------------------------------*/
AP4_Result
AP4_DecoderConfigDescriptor::Inspect(AP4_AtomInspector& inspector)
{
inspector.StartDescriptor("DecoderConfig", GetHeaderSize(), GetSize());
inspector.AddField("stream_type", m_StreamType);
inspector.AddField("object_type", m_ObjectTypeIndication);
inspector.AddField("up_stream", m_UpStream);
inspector.AddField("buffer_size", m_BufferSize);
inspector.AddField("max_bitrate", m_MaxBitrate);
inspector.AddField("avg_bitrate", m_AverageBitrate);
// inspect children
m_SubDescriptors.Apply(AP4_DescriptorListInspector(inspector));
inspector.EndDescriptor();
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_DecoderConfigDescriptor::GetDecoderSpecificInfoDescriptor
+---------------------------------------------------------------------*/
const AP4_DecoderSpecificInfoDescriptor*
AP4_DecoderConfigDescriptor::GetDecoderSpecificInfoDescriptor() const
{
// find the decoder specific info
AP4_Descriptor* descriptor = NULL;
AP4_Result result =
m_SubDescriptors.Find(AP4_DescriptorFinder(AP4_DESCRIPTOR_TAG_DECODER_SPECIFIC_INFO),
descriptor);
// return it
if (AP4_SUCCEEDED(result)) {
return AP4_DYNAMIC_CAST(AP4_DecoderSpecificInfoDescriptor, descriptor);
} else {
return NULL;
}
}
|
