descriptors.cpp

mpeg4 demux 代码

/* <LIC_AMD_STD>
 * Copyright (C) 2003-2005 Advanced Micro Devices, Inc.  All Rights Reserved.
 *
 * Unless otherwise designated in writing, this software and any related
 * documentation are the confidential proprietary information of AMD.
 * THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT ANY
 * UNLESS OTHERWISE NOTED IN WRITING, EXPRESS OR IMPLIED WARRANTY OF ANY
 * KIND, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY,
 * NONINFRINGEMENT, TITLE, FITNESS FOR ANY PARTICULAR PURPOSE AND IN NO
 * EVENT SHALL AMD OR ITS LICENSORS BE LIABLE FOR ANY DAMAGES WHATSOEVER.
 *
 * AMD does not assume any responsibility for any errors which may appear
 * in the Materials nor any responsibility to support or update the
 * Materials.  AMD retains the right to modify the Materials at any time,
 * without notice, and is not obligated to provide such modified
 * Materials to you. AMD is not obligated to furnish, support, or make
 * any further information available to you.
 * </LIC_AMD_STD>  */
/* <CTL_AMD_STD>
 * </CTL_AMD_STD>  */
/* <DOC_AMD_STD>
 * </DOC_AMD_STD>  */

#include "descriptors.h"

void CSLConfigDescriptor::ReadData(Byte_Stream &input_stream)
{
		UINT temp =0;
		predefined = input_stream.GetByte();
		if (predefined==0)
		{
			temp = input_stream.GetByte();
			useAccessUnitStartFlag			= BitField(temp,7,1);
			useAccessUnitEndFlag			= BitField(temp,6,1);
			useRandomAccessPointFlag		= BitField(temp,5,1);
			hasRandomAccessUnitsOnlyFlag	= BitField(temp,4,1);
			usePaddingFlag					= BitField(temp,3,1);
			useTimeStampsFlag				= BitField(temp,2,1);
			useIdleFlag						= BitField(temp,1,1);
			durationFlag					= BitField(temp,0,1);

			timeStampResolution = input_stream.GetUINT();
			OCRResolution = input_stream.GetUINT();
			timeStampLength = input_stream.GetByte(); // must be . 64
			OCRLength = input_stream.GetByte(); // must be . 64
			AU_Length = input_stream.GetByte(); // must be . 32
			instantBitrateLength = input_stream.GetByte();
			temp = input_stream.GetWORD();
			degradationPriorityLength	= BitField(temp,12,4);
			AU_seqNumLength				= BitField(temp,7,5); // must be . 16
			packetSeqNumLength			= BitField(temp,2,5); // must be . 16
			reserved					= BitField(temp,0,2); // should be 11;
			if (durationFlag) {
				 timeScale = input_stream.GetUINT();
				 accessUnitDuration = input_stream.GetWORD();
				 compositionUnitDuration = input_stream.GetWORD();
			}
			if (!useTimeStampsFlag) {
				// TODO: currently assumeses timeStampLength to be 32-bits
				temp = input_stream.GetUINT();
				startDecodingTimeStamp = BitField(temp,0,timeStampLength);
				temp = input_stream.GetUINT();
				startCompositionTimeStamp = BitField(temp,0,timeStampLength);
			}
		}
		temp = input_stream.GetByte();
		OCRstreamFlag = BitField(temp,7,1);
		reserved = BitField(temp,0,7); // should be 1111111;
		if (OCRstreamFlag)
			OCR_ES_Id = input_stream.GetWORD();
}

void CDecoderConfigDescriptor::ReadData(Byte_Stream &input_stream)
{
		UINT temp =0;
		objectTypeIndication = input_stream.GetByte();
		temp = input_stream.GetByte();
		streamType			= BitField(temp,2,6);
		upStream			= BitField(temp,1,1);
		reserved			= BitField(temp,0,1);
		temp = input_stream.GetUINT();
		bufferSizeDB	=  BitField(temp,8,24);
		maxBitrate  	= BitField(temp,0,8);
		temp = input_stream.GetUINT();
		maxBitrate <<= 24;
		maxBitrate |= BitField(temp,8,24);
		avgBitrate = BitField(temp,0,8);
		avgBitrate <<= 24;
		temp = input_stream.GetWORD();
		avgBitrate |= (temp << 8);
		temp = input_stream.GetByte();
		avgBitrate |= temp ;
		//if(DescriptorSize > 18 )
			//AudioSpecificInfo.ReadData(input_stream);
}


void CES_Descriptor::ReadData(Byte_Stream &input_stream)
{
		UINT temp =0;
		int byte_count = 0;
		tag = input_stream.GetByte();
		if(tag == ES_DescrTag)
		{
			GetDescriptorLength(input_stream);
			ES_ID = input_stream.GetWORD();
			temp = input_stream.GetByte();
			streamDependenceFlag			= BitField(temp,7,1);
			URL_Flag						= BitField(temp,6,1);
			reserved						= BitField(temp,5,1);
			streamPriority					= BitField(temp,0,5);
			//if(reserved != 0x1)
			if (streamDependenceFlag)
				  dependsOn_ES_ID  = input_stream.GetWORD();
			if(URL_Flag)
			{
				URLlength = input_stream.GetByte();
				URLstring = (m_u8 *) malloc(URLlength * sizeof(m_u8));
				memcpy(URLstring,input_stream.GetBytePointer(),URLlength);
			}
			tag = input_stream.GetByte();
			if(tag == DecoderConfigDescrTag)
			{
				decConfigDescr = new CDecoderConfigDescriptor();
				decConfigDescr->GetDescriptorLength(input_stream);
				decConfigDescr->tag = DecoderConfigDescrTag;
				decConfigDescr->ReadData(input_stream);
			}
			// skip rest of the descriptor
			/*
			tag = input_stream.GetByte();
			if(tag == SLConfigDescrTag)
			{
				byte_count = 0;
				while(input_stream.GetByte() == 0x80 && byte_count++ < 4);
				slConfigDescr = new CSLConfigDescriptor;
				slConfigDescr->tag = SLConfigDescrTag;
				slConfigDescr->ReadData(input_stream);
			}
			*/
		}

}

void CObjectDescriptor::ReadData(Byte_Stream &input_stream)
{
		UINT temp =0;
		//tag = input_stream.GetByte();
		temp = input_stream.GetWORD();
		ObjectDescriptorID				= BitField(temp,6,10);
		URL_Flag						= BitField(temp,5,1);
		reserved						= BitField(temp,0,5);
		//if(reserved != 0xf1)
		if(URL_Flag)
		{
			URLlength = input_stream.GetByte();
			URLstring = (m_u8 *) malloc(URLlength * sizeof(m_u8));
			memcpy(URLstring,input_stream.GetBytePointer(),URLlength);
		}
		else
		{
			while(input_stream.GetByte() == ES_DescrTag)
			{
				CESDescriptorList[esd_cnt] = new CES_Descriptor;
				CESDescriptorList[esd_cnt]->tag = ES_DescrTag;
				CESDescriptorList[esd_cnt]->ReadData(input_stream);
				esd_cnt++;
			}
		}
}

void CInitialObjectDescriptor::ReadData(Byte_Stream &input_stream)
{
		UINT temp =0;
		temp = input_stream.GetWORD();
		ObjectDescriptorID				= BitField(temp,6,10);
		URL_Flag						= BitField(temp,5,1);
		includeInlineProfileLevelFlag	= BitField(temp,4,1);
		reserved						= BitField(temp,0,4);
		//if(reserved != 0xf)
		if(URL_Flag)
		{
			URLlength = input_stream.GetByte();
			URLstring = (m_u8 *) malloc(URLlength * sizeof(m_u8));
			memcpy(URLstring,input_stream.GetBytePointer(),URLlength);
		}
		else
		{
			ODProfileLevelIndication = input_stream.GetByte();
	 		sceneProfileLevelIndication = input_stream.GetByte();
	 		audioProfileLevelIndication = input_stream.GetByte();
	 		visualProfileLevelIndication = input_stream.GetByte();
	 		graphicsProfileLevelIndication = input_stream.GetByte();
		}
		while(input_stream.GetByte() == ES_DescrTag)
		{
			CESDescriptorList[esd_cnt] = new CES_Descriptor;
			CESDescriptorList[esd_cnt]->tag = ES_DescrTag;
			CESDescriptorList[esd_cnt]->ReadData(input_stream);
			esd_cnt++;
		}

}