atom_avcc.cpp

完整的RTP RTSP代码库

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is MPEG4IP.
 * 
 * The Initial Developer of the Original Code is Cisco Systems Inc.
 * Portions created by Cisco Systems Inc. are
 * Copyright (C) Cisco Systems Inc. 2004.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Bill May [e-mail]
 */

#include "mp4common.h"

/*
 * SizeTableProperty is a special version of the MP4TableProperty - 
 * the BytesProperty will need to set the value before it can read
 * from the file
 */
class SizeTableProperty : public MP4TableProperty 
{
 public:
  SizeTableProperty(char *name, MP4IntegerProperty *pCountProperty) :
    MP4TableProperty(name, pCountProperty) {};
 protected:
  void ReadEntry(MP4File *pFile, u_int32_t index) {
    // Each table has a size, followed by the length field
    // first, read the length
    m_pProperties[0]->Read(pFile, index);
    MP4IntegerProperty *pIntProp = (MP4IntegerProperty *)m_pProperties[0];
    // set the size in the bytes property
    MP4BytesProperty *pBytesProp = (MP4BytesProperty *)m_pProperties[1];
    pBytesProp->SetValueSize(pIntProp->GetValue(index), index);
    // And read the bytes
    m_pProperties[1]->Read(pFile, index);
  };
};

MP4AvcCAtom::MP4AvcCAtom() 
	: MP4Atom("avcC")
{
  MP4BitfieldProperty *pCount;
  MP4TableProperty *pTable;

  AddProperty( new MP4Integer8Property("configurationVersion")); /* 0 */

  AddProperty( new MP4Integer8Property("AVCProfileIndication")); /* 1 */

  AddProperty( new MP4Integer8Property("profile_compatibility")); /* 2 */

  AddProperty( new MP4Integer8Property("AVCLevelIndication")); /* 3 */

  AddProperty( new MP4BitfieldProperty("reserved", 6)); /* 4 */
  AddProperty( new MP4BitfieldProperty("lengthSizeMinusOne", 2)); /* 5 */
  AddProperty( new MP4BitfieldProperty("reserved1", 3)); /* 6 */
  pCount = new MP4BitfieldProperty("numOfSequenceParameterSets", 5);
  AddProperty(pCount); /* 7 */

  pTable = new SizeTableProperty("sequenceEntries", pCount);
  AddProperty(pTable); /* 8 */
  pTable->AddProperty(new MP4Integer16Property("sequenceParameterSetLength"));
  pTable->AddProperty(new MP4BytesProperty("sequenceParameterSetNALUnit"));

  MP4Integer8Property *pCount2 = new MP4Integer8Property("numOfPictureParameterSets");
  AddProperty(pCount2); /* 9 */

  pTable = new SizeTableProperty("pictureEntries", pCount2);
  AddProperty(pTable); /* 10 */
  pTable->AddProperty(new MP4Integer16Property("pictureParameterSetLength"));
  pTable->AddProperty(new MP4BytesProperty("pictureParameterSetNALUnit"));
}

void MP4AvcCAtom::Generate()
{
	MP4Atom::Generate();

	((MP4Integer8Property*)m_pProperties[0])->SetValue(1);

	m_pProperties[4]->SetReadOnly(false);
	((MP4BitfieldProperty*)m_pProperties[4])->SetValue(0x3f);
	m_pProperties[4]->SetReadOnly(true);

	m_pProperties[6]->SetReadOnly(false);
	((MP4BitfieldProperty*)m_pProperties[6])->SetValue(0x7);
	m_pProperties[6]->SetReadOnly(true);
#if 0
	// property reserved4 has non-zero fixed values
	static u_int8_t reserved4[4] = {
		0x00, 0x18, 0xFF, 0xFF, 
	};
	m_pProperties[7]->SetReadOnly(false);
	((MP4BytesProperty*)m_pProperties[7])->
		SetValue(reserved4, sizeof(reserved4));
	m_pProperties[7]->SetReadOnly(true);
#endif
}

// 
// Clone - clone my properties to destination atom
//
// this method simplifies duplicating avcC atom properties from 
// source to destination file using a single API rather than 
// having to copy each property.  This API encapsulates the object 
// so the application layer need not concern with each property 
// thereby isolating any future changes to atom properties.
//
// ----------------------------------------
// property   description
// ----------------------------------------
//  
// 0 	configurationVersion
// 1 	AVCProfileIndication
// 2	profile_compatibility
// 3	AVCLevelIndication
// 4 	reserved
// 5 	lengthSizeMinusOne 
// 6 	reserved
// 7 	number of SPS
// 8	SPS entries
// 9	number of PPS
// 10	PPS entries
//
//
void MP4AvcCAtom::Clone(MP4AvcCAtom *dstAtom)
{

	MP4Property *dstProperty;
  	MP4TableProperty *pTable;
	u_int16_t i16;
	u_int64_t i32;
	u_int64_t i64;
	u_int8_t *tmp;

	// source pointer Property I16
	MP4Integer16Property *spPI16;
	// source pointer Property Bytes
	MP4BytesProperty *spPB;

	// dest pointer Property I16
	MP4Integer16Property *dpPI16;
	// dest pointer Property Bytes
	MP4BytesProperty *dpPB;


	// start with defaults and reserved fields
	dstAtom->Generate();

	// 0, 4, 6 are now generated from defaults
	// leaving 1, 2, 3, 5, 7, 8, 9, 10 to export
	
	dstProperty=dstAtom->GetProperty(1);
	((MP4Integer8Property *)dstProperty)->SetValue(
		((MP4Integer8Property *)m_pProperties[1])->GetValue());
	
	dstProperty=dstAtom->GetProperty(2);
	((MP4Integer8Property *)dstProperty)->SetValue(
		((MP4Integer8Property *)m_pProperties[2])->GetValue());
	
	dstProperty=dstAtom->GetProperty(3);
	((MP4Integer8Property *)dstProperty)->SetValue(
		((MP4Integer8Property *)m_pProperties[3])->GetValue());
	
	dstProperty=dstAtom->GetProperty(5);
	((MP4BitfieldProperty *)dstProperty)->SetValue(
		((MP4BitfieldProperty *)m_pProperties[5])->GetValue());

	// 
	// 7 and 8 are related SPS (one set of sequence parameters) 
	//
	// first the count bitfield 
	//
	dstProperty=dstAtom->GetProperty(7);
	dstProperty->SetReadOnly(false);
	((MP4BitfieldProperty *)dstProperty)->SetValue(
		((MP4BitfieldProperty *)m_pProperties[7])->GetValue());
	dstProperty->SetReadOnly(true);

	// next export SPS Length and NAL bytes */

	// first source pointers
	pTable = (MP4TableProperty *) m_pProperties[8];
	spPI16 = (MP4Integer16Property *)pTable->GetProperty(0);
	spPB = (MP4BytesProperty *)pTable->GetProperty(1);

	// now dest pointers
	dstProperty=dstAtom->GetProperty(8);
	pTable = (MP4TableProperty *) dstProperty;
	dpPI16 = (MP4Integer16Property *)pTable->GetProperty(0);
	dpPB = (MP4BytesProperty *)pTable->GetProperty(1);
	
	// sps length
	i16 = spPI16->GetValue();
	i64 = i16;
	// FIXME - this leaves m_maxNumElements =2
	// but src atom m_maxNumElements is 1 
	dpPI16->InsertValue(i64, 0);

	// export byte array
	i32 = i16;
	// copy bytes to local buffer 
	tmp = (u_int8_t *)MP4Malloc(i32);
	ASSERT(tmp != NULL);
	spPB->CopyValue(tmp, 0);	
	// set element count
	dpPB->SetCount(1);
	// copy bytes 
	dpPB->SetValue(tmp, i32, 0);
	MP4Free((void *)tmp);

	// 
	// 9 and 10 are related PPS (one set of picture parameters) 
	//
	// first the integer8 count
	//
	dstProperty=dstAtom->GetProperty(9);
	dstProperty->SetReadOnly(false);
	((MP4Integer8Property *)dstProperty)->SetValue(
		((MP4Integer8Property *)m_pProperties[9])->GetValue());
	dstProperty->SetReadOnly(true);

	// next export PPS Length and NAL bytes */

	// first source pointers
	pTable = (MP4TableProperty *) m_pProperties[10];
	spPI16 = (MP4Integer16Property *)pTable->GetProperty(0);
	spPB = (MP4BytesProperty *)pTable->GetProperty(1);

	// now dest pointers
	dstProperty=dstAtom->GetProperty(10);
	pTable = (MP4TableProperty *) dstProperty;
	dpPI16 = (MP4Integer16Property *)pTable->GetProperty(0);
	dpPB = (MP4BytesProperty *)pTable->GetProperty(1);
	
	// pps length
	i16 = spPI16->GetValue();
	i64 = i16;
	dpPI16->InsertValue(i64, 0);

	// export byte array
	i32 = i16;
	// copy bytes to local buffer 
	tmp = (u_int8_t *)MP4Malloc(i32);
	ASSERT(tmp != NULL);
	spPB->CopyValue(tmp, 0);	
	// set element count
	dpPB->SetCount(1);
	// copy bytes 
	dpPB->SetValue(tmp, i32, 0);
	MP4Free((void *)tmp);
}