descriptors.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. 2001.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie		[e-mail]
 */

#include "mp4common.h"

MP4BaseDescriptor::MP4BaseDescriptor (u_int8_t tag) : MP4Descriptor(tag)
{
  switch (tag) {
  case MP4ESIDIncDescrTag:
    AddProperty( /* 0 */
		new MP4Integer32Property("id"));
    break;
  case MP4ESIDRefDescrTag:
    AddProperty( /* 0 */
		new MP4Integer16Property("refIndex"));
    break;
  case MP4IPIPtrDescrTag:
    AddProperty( /* 0 */
		new MP4Integer16Property("IPIESId"));
    break;
  case MP4SupplContentIdDescrTag:
    AddProperty( /* 0 */
		new MP4BytesProperty("languageCode", 3));
    AddProperty( /* 1 */
		new MP4StringProperty("title", Counted));
    AddProperty( /* 2 */
		new MP4StringProperty("value", Counted));
    break;
  case MP4IPMPPtrDescrTag:
    AddProperty( /* 0 */
		new MP4Integer8Property("IPMPDescriptorId"));
    break;
  case MP4ExtProfileLevelDescrTag:
    AddProperty( /* 0 */
		new MP4Integer8Property("profileLevelIndicationIndex"));
    AddProperty( /* 1 */
		new MP4Integer8Property("ODProfileLevelIndication"));
    AddProperty( /* 2 */
		new MP4Integer8Property("sceneProfileLevelIndication"));
    AddProperty( /* 3 */
		new MP4Integer8Property("audioProfileLevelIndication"));
    AddProperty( /* 4 */
		new MP4Integer8Property("visualProfileLevelIndication"));
    AddProperty( /* 5 */
		new MP4Integer8Property("graphicsProfileLevelIndication"));
    AddProperty( /* 6 */
		new MP4Integer8Property("MPEGJProfileLevelIndication"));
    break;
  default:
    MP4Printf("error in base descriptor - tag %u", tag);
    break;

  }
}

MP4BytesDescriptor::MP4BytesDescriptor (u_int8_t tag) : MP4Descriptor(tag)
{
  m_size_offset = 0;
  m_bytes_index = 0;
  if (tag >= MP4ExtDescrTagsStart && tag <= MP4ExtDescrTagsEnd) {
    AddProperty( /* 0 */
		new MP4BytesProperty("data"));
  } else {
    switch (tag) {
    case MP4DecSpecificDescrTag:
      AddProperty( /* 0 */
		  new MP4BytesProperty("info"));
      // no change to m_size
      break;
    case MP4IPMPDescrTag:
      AddProperty( /* 0 */
		  new MP4Integer8Property("IPMPDescriptorId"));
      AddProperty( /* 1 */
		  new MP4Integer16Property("IPMPSType"));
      AddProperty( /* 2 */
		  new MP4BytesProperty("IPMPData"));
      /* note: if IPMPSType == 0, IPMPData is an URL */
      m_size_offset = 3;
      m_bytes_index = 2;
      break;
    case MP4RegistrationDescrTag:
      AddProperty( /* 0 */
		  new MP4Integer32Property("formatIdentifier"));
      AddProperty( /* 1 */
		  new MP4BytesProperty("additionalIdentificationInfo"));
      m_size_offset = 4;
      m_bytes_index = 1;
      break;
    default:
      MP4Printf("error in bytes descriptor - tag %u", tag);
      break;
    }
  }
}

void MP4BytesDescriptor::Read(MP4File *pFile)
{
  ReadHeader(pFile);
  
  /* byte properties need to know how long they are before reading */
  ((MP4BytesProperty*)m_pProperties[m_bytes_index])->SetValueSize(m_size - m_size_offset);

  ReadProperties(pFile);
}
MP4IODescriptor::MP4IODescriptor()
	: MP4Descriptor(MP4FileIODescrTag)
{
	/* N.B. other member functions depend on the property indicies */
	AddProperty( /* 0 */
		new MP4BitfieldProperty("objectDescriptorId", 10));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("URLFlag", 1));
	AddProperty( /* 2 */
		new MP4BitfieldProperty("includeInlineProfileLevelFlag", 1));
	AddProperty( /* 3 */
		new MP4BitfieldProperty("reserved", 4));
	AddProperty( /* 4 */
		new MP4StringProperty("URL", Counted));
	AddProperty( /* 5 */
		new MP4Integer8Property("ODProfileLevelId"));
	AddProperty( /* 6 */
		new MP4Integer8Property("sceneProfileLevelId"));
	AddProperty( /* 7 */
		new MP4Integer8Property("audioProfileLevelId"));
	AddProperty( /* 8 */
		new MP4Integer8Property("visualProfileLevelId"));
	AddProperty( /* 9 */
		new MP4Integer8Property("graphicsProfileLevelId"));
	AddProperty( /* 10 */ 
		new MP4DescriptorProperty("esIds", 
			MP4ESIDIncDescrTag, 0, Required, Many));
	AddProperty( /* 11 */ 
		new MP4DescriptorProperty("ociDescr", 
			MP4OCIDescrTagsStart, MP4OCIDescrTagsEnd, Optional, Many));
	AddProperty( /* 12 */
		new MP4DescriptorProperty("ipmpDescrPtr",
			MP4IPMPPtrDescrTag, 0, Optional, Many));
	AddProperty( /* 13 */
		new MP4DescriptorProperty("extDescr",
			MP4ExtDescrTagsStart, MP4ExtDescrTagsEnd, Optional, Many));

	SetReadMutate(2);
}

void MP4IODescriptor::Generate()
{
	((MP4BitfieldProperty*)m_pProperties[0])->SetValue(1);
	((MP4BitfieldProperty*)m_pProperties[3])->SetValue(0xF);
	for (u_int32_t i = 5; i <= 9; i++) {
		((MP4Integer8Property*)m_pProperties[i])->SetValue(0xFF);
	}
}

void MP4IODescriptor::Mutate()
{
	bool urlFlag = ((MP4BitfieldProperty*)m_pProperties[1])->GetValue();

	m_pProperties[4]->SetImplicit(!urlFlag);
	for (u_int32_t i = 5; i <= 12; i++) {
		m_pProperties[i]->SetImplicit(urlFlag);
	}
}

MP4ODescriptor::MP4ODescriptor()
	: MP4Descriptor(MP4FileODescrTag)
{
	/* N.B. other member functions depend on the property indicies */
	AddProperty( /* 0 */
		new MP4BitfieldProperty("objectDescriptorId", 10));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("URLFlag", 1));
	AddProperty( /* 2 */
		new MP4BitfieldProperty("reserved", 5));
	AddProperty( /* 3 */
		new MP4StringProperty("URL", Counted));
	AddProperty( /* 4 */ 
		new MP4DescriptorProperty("esIds", 
			MP4ESIDRefDescrTag, 0, Required, Many));
	AddProperty( /* 5 */ 
		new MP4DescriptorProperty("ociDescr", 
			MP4OCIDescrTagsStart, MP4OCIDescrTagsEnd, Optional, Many));
	AddProperty( /* 6 */
		new MP4DescriptorProperty("ipmpDescrPtr",
			MP4IPMPPtrDescrTag, 0, Optional, Many));
	AddProperty( /* 7 */
		new MP4DescriptorProperty("extDescr",
			MP4ExtDescrTagsStart, MP4ExtDescrTagsEnd, Optional, Many));

	SetReadMutate(2);
}

void MP4ODescriptor::Generate()
{
	((MP4BitfieldProperty*)m_pProperties[2])->SetValue(0x1F);
}

void MP4ODescriptor::Mutate()
{
	bool urlFlag = ((MP4BitfieldProperty*)m_pProperties[1])->GetValue();

	m_pProperties[3]->SetImplicit(!urlFlag);
	for (u_int32_t i = 4; i <= 6; i++) {
		m_pProperties[i]->SetImplicit(urlFlag);
	}
}

MP4ESDescriptor::MP4ESDescriptor()
	: MP4Descriptor(MP4ESDescrTag)
{
	/* N.B. other class functions depend on the property indicies */
	AddProperty( /* 0 */
		new MP4Integer16Property("ESID"));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("streamDependenceFlag", 1));
	AddProperty( /* 2 */
		new MP4BitfieldProperty("URLFlag", 1));
	AddProperty( /* 3 */
		new MP4BitfieldProperty("OCRstreamFlag", 1));
	AddProperty( /* 4 */
		new MP4BitfieldProperty("streamPriority", 5));
	AddProperty( /* 5 */
		new MP4Integer16Property("dependsOnESID"));
	AddProperty( /* 6 */
		new MP4StringProperty("URL", Counted));
	AddProperty( /* 7 */
		new MP4Integer16Property("OCRESID"));
	AddProperty( /* 8 */
		new MP4DescriptorProperty("decConfigDescr",
			MP4DecConfigDescrTag, 0, Required, OnlyOne));
	AddProperty( /* 9 */
		new MP4DescriptorProperty("slConfigDescr",
			MP4SLConfigDescrTag, 0, Required, OnlyOne));
	AddProperty( /* 10 */
		new MP4DescriptorProperty("ipiPtr",
			MP4IPIPtrDescrTag, 0, Optional, OnlyOne));
	AddProperty( /* 11 */
		new MP4DescriptorProperty("ipIds",
			MP4ContentIdDescrTag, MP4SupplContentIdDescrTag, Optional, Many));
	AddProperty( /* 12 */
		new MP4DescriptorProperty("ipmpDescrPtr",
			MP4IPMPPtrDescrTag, 0, Optional, Many));
	AddProperty( /* 13 */
		new MP4DescriptorProperty("langDescr",
			MP4LanguageDescrTag, 0, Optional, Many));
	AddProperty( /* 14 */
		new MP4DescriptorProperty("qosDescr",
			MP4QosDescrTag, 0, Optional, OnlyOne));
	AddProperty( /* 15 */
		new MP4DescriptorProperty("regDescr",
			MP4RegistrationDescrTag, 0, Optional, OnlyOne));
	AddProperty( /* 16 */
		new MP4DescriptorProperty("extDescr",
			MP4ExtDescrTagsStart, MP4ExtDescrTagsEnd, Optional, Many));

	SetReadMutate(5);
}

void MP4ESDescriptor::Mutate()
{
	bool streamDependFlag = 
		((MP4BitfieldProperty*)m_pProperties[1])->GetValue();
	m_pProperties[5]->SetImplicit(!streamDependFlag);

	bool urlFlag = 
		((MP4BitfieldProperty*)m_pProperties[2])->GetValue();
	m_pProperties[6]->SetImplicit(!urlFlag);

	bool ocrFlag = 
		((MP4BitfieldProperty*)m_pProperties[3])->GetValue();
	m_pProperties[7]->SetImplicit(!ocrFlag);
}

MP4DecConfigDescriptor::MP4DecConfigDescriptor()
	: MP4Descriptor(MP4DecConfigDescrTag)
{
	AddProperty( /* 0 */
		new MP4Integer8Property("objectTypeId"));
	AddProperty( /* 1 */
		new MP4BitfieldProperty("streamType", 6));
	AddProperty( /* 2 */
		new MP4BitfieldProperty("upStream", 1));
	AddProperty( /* 3 */
		new MP4BitfieldProperty("reserved", 1));
	AddProperty( /* 4 */
		new MP4BitfieldProperty("bufferSizeDB", 24));
	AddProperty( /* 5 */