mp4atom.cpp

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/*
 * 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 - 2004.  All Rights Reserved.
 * 
 * 3GPP features implementation is based on 3GPP's TS26.234-v5.60,
 * and was contributed by Ximpo Group Ltd.
 *
 * Portions created by Ximpo Group Ltd. are
 * Copyright (C) Ximpo Group Ltd. 2003, 2004.  All Rights Reserved.
 * 
 * Contributor(s): 
 *		Dave Mackie			[e-mail]
 *		Alix Marchandise-Franquet	[e-mail]
 *              Ximpo Group Ltd.                [e-mail]
 */

#include "mp4common.h"
#include "atoms.h"

MP4AtomInfo::MP4AtomInfo(const char* name, bool mandatory, bool onlyOne) 
{
	m_name = name;
	m_mandatory = mandatory;
	m_onlyOne = onlyOne;
	m_count = 0;
}

MP4Atom::MP4Atom(const char* type) 
{
	SetType(type);
	m_unknownType = FALSE;
	m_pFile = NULL;
	m_start = 0;
	m_end = 0;
	m_size = 0;
	m_pParentAtom = NULL;
	m_depth = 0xFF;
}

MP4Atom::~MP4Atom()
{
	u_int32_t i;

	for (i = 0; i < m_pProperties.Size(); i++) {
		delete m_pProperties[i];
	}
	for (i = 0; i < m_pChildAtomInfos.Size(); i++) {
		delete m_pChildAtomInfos[i];
	}
	for (i = 0; i < m_pChildAtoms.Size(); i++) {
		delete m_pChildAtoms[i];
	}
}

MP4Atom* MP4Atom::CreateAtom(const char* type)
{
  MP4Atom* pAtom = NULL;

  if (type == NULL) {
    pAtom = new MP4RootAtom();
  } else {
    switch((uint8_t)type[0]) {
    case 'b':
      if (ATOMID(type) == ATOMID("bitr")) {
	pAtom = new MP4BitrAtom();
      }
      break;
    case 'c':
      if (ATOMID(type) == ATOMID("ctts")) {
	pAtom = new MP4CttsAtom();
      } else if (ATOMID(type) == ATOMID("co64")) {
	pAtom = new MP4Co64Atom();
      } else if (ATOMID(type) == ATOMID("cprt")) {
	pAtom = new MP4CprtAtom();
      } else if (ATOMID(type) == ATOMID("cpil")) { /* Apple iTunes */
	pAtom = new MP4CpilAtom();
      } else if (ATOMID(type) == ATOMID("covr")) { /* Apple iTunes */
	pAtom = new MP4CovrAtom();
      }
      break;
    case 'd':
      if (ATOMID(type) == ATOMID("d263")) {
	pAtom = new MP4D263Atom();
      } else if (ATOMID(type) == ATOMID("damr")) {
	pAtom = new MP4DamrAtom();
      } else if (ATOMID(type) == ATOMID("dinf")) {
	pAtom = new MP4DinfAtom();
      } else if (ATOMID(type) == ATOMID("dref")) {
	pAtom = new MP4DrefAtom();
      } else if (ATOMID(type) == ATOMID("dpnd")) {
	pAtom = new MP4TrefTypeAtom(type);
      } else if (ATOMID(type) == ATOMID("dmed")) {
	pAtom = new MP4DmedAtom();
      } else if (ATOMID(type) == ATOMID("dimm")) {
	pAtom = new MP4DimmAtom();
      } else if (ATOMID(type) == ATOMID("drep")) {
	pAtom = new MP4DrepAtom();
      } else if (ATOMID(type) == ATOMID("dmax")) {
	pAtom = new MP4DmaxAtom();
      } else if (ATOMID(type) == ATOMID("data")) { /* Apple iTunes */
	pAtom = new MP4DataAtom();
      } else if (ATOMID(type) == ATOMID("disk")) { /* Apple iTunes */
	pAtom = new MP4DiskAtom();
      }
      break;
    case 'e':
      if (ATOMID(type) == ATOMID("esds")) {
	pAtom = new MP4EsdsAtom();
      } else if (ATOMID(type) == ATOMID("edts")) {
	pAtom = new MP4EdtsAtom();
      } else if (ATOMID(type) == ATOMID("elst")) {
	pAtom = new MP4ElstAtom();
      } else if (ATOMID(type) == ATOMID("enca")) {
	pAtom = new MP4EncaAtom();
      } else if (ATOMID(type) == ATOMID("encv")) {
	pAtom = new MP4EncvAtom();
      }
      break;
    case 'f':
      if (ATOMID(type) == ATOMID("free")) {
	pAtom = new MP4FreeAtom();
      } else if (ATOMID(type) == ATOMID("frma")) {
	pAtom = new MP4FrmaAtom();
      } else if (ATOMID(type) == ATOMID("ftyp")) {
	pAtom = new MP4FtypAtom();
      }
      break;
    case 'g':
      if (ATOMID(type) == ATOMID("gnre")) { // Apple iTunes 
	pAtom = new MP4GnreAtom();
      }
      break;
    case 'h':
      if (ATOMID(type) == ATOMID("hdlr")) {
	pAtom = new MP4HdlrAtom();
      } else if (ATOMID(type) == ATOMID("hmhd")) {
	pAtom = new MP4HmhdAtom();
      } else if (ATOMID(type) == ATOMID("hint")) {
	pAtom = new MP4TrefTypeAtom(type);
      } else if (ATOMID(type) == ATOMID("hnti")) {
	pAtom = new MP4HntiAtom();
      } else if (ATOMID(type) == ATOMID("hinf")) {
	pAtom = new MP4HinfAtom();
      }
      break;
    case 'i':
      if (ATOMID(type) == ATOMID("iKMS")) {
	pAtom = new MP4IKMSAtom();
      } else if (ATOMID(type) == ATOMID("iSFM")) {
	pAtom = new MP4ISFMAtom();
      } else if (ATOMID(type) == ATOMID("iods")) {
	pAtom = new MP4IodsAtom();
      } else if (ATOMID(type) == ATOMID("ipir")) {
	pAtom = new MP4TrefTypeAtom(type);
      } else if (ATOMID(type) == ATOMID("ilst")) {
	pAtom = new MP4IlstAtom();
      }
      break;
    case 'm':
      if (ATOMID(type) == ATOMID("mdia")) {
	pAtom = new MP4MdiaAtom();
      } else if (ATOMID(type) == ATOMID("minf")) {
	pAtom = new MP4MinfAtom();
      } else if (ATOMID(type) == ATOMID("mdhd")) {
	pAtom = new MP4MdhdAtom();
      } else if (ATOMID(type) == ATOMID("mdat")) {
	pAtom = new MP4MdatAtom();
      } else if (ATOMID(type) == ATOMID("moov")) {
	pAtom = new MP4MoovAtom();
      } else if (ATOMID(type) == ATOMID("mvhd")) {
	pAtom = new MP4MvhdAtom();
      } else if (ATOMID(type) == ATOMID("mpod")) {
	pAtom = new MP4TrefTypeAtom(type);
      } else if (ATOMID(type) == ATOMID("mp4a")) {
	pAtom = new MP4Mp4aAtom();
      } else if (ATOMID(type) == ATOMID("mp4s")) {
	pAtom = new MP4Mp4sAtom();
      } else if (ATOMID(type) == ATOMID("mp4v")) {
	pAtom = new MP4Mp4vAtom();
      } else if (ATOMID(type) == ATOMID("moof")) {
	pAtom = new MP4MoofAtom();
      } else if (ATOMID(type) == ATOMID("mfhd")) {
	pAtom = new MP4MfhdAtom();
      } else if (ATOMID(type) == ATOMID("mvex")) {
	pAtom = new MP4MvexAtom();
      } else if (ATOMID(type) == ATOMID("maxr")) {
	pAtom = new MP4MaxrAtom();
      } else if (ATOMID(type) == ATOMID("meta")) { // iTunes
	pAtom = new MP4MetaAtom();
      } else if (ATOMID(type) == ATOMID("mean")) { // iTunes
	pAtom = new MP4MeanAtom();
      }
      break;
    case 'n':
      if (ATOMID(type) == ATOMID("nmhd")) {
	pAtom = new MP4NmhdAtom();
      } else if (ATOMID(type) == ATOMID("nump")) {
	pAtom = new MP4NumpAtom();
      } else if (ATOMID(type) == ATOMID("name")) { // iTunes
	pAtom = new MP4NameAtom();
      }
      break;
    case 'p':
      if (ATOMID(type) == ATOMID("pmax")) {
	pAtom = new MP4PmaxAtom();
      } else if (ATOMID(type) == ATOMID("payt")) {
	pAtom = new MP4PaytAtom();
      }
      break;
    case 'r':
      if (ATOMID(type) == ATOMID("rtp ")) {
	pAtom = new MP4RtpAtom();
      }
      break;
    case 's':
      if (ATOMID(type) == ATOMID("s263"))  {
        pAtom = new MP4S263Atom();
      } else if (ATOMID(type) == ATOMID("samr")) {
	pAtom = new MP4SamrAtom();
      } else if (ATOMID(type) == ATOMID("sawb")) {
	pAtom = new MP4SawbAtom();
      } else if (ATOMID(type) == ATOMID("schi")) {
	pAtom = new MP4SchiAtom();
      } else if (ATOMID(type) == ATOMID("schm")) {
	pAtom = new MP4SchmAtom();
      } else if (ATOMID(type) == ATOMID("sinf")) {
	pAtom = new MP4SinfAtom();
      } else if (ATOMID(type) == ATOMID("stbl")) {
	pAtom = new MP4StblAtom();
      } else if (ATOMID(type) == ATOMID("stsd")) {
	pAtom = new MP4StsdAtom();
      } else if (ATOMID(type) == ATOMID("stts")) {
	pAtom = new MP4SttsAtom();
      } else if (ATOMID(type) == ATOMID("stsz")) {
	pAtom = new MP4StszAtom();
      } else if (ATOMID(type) == ATOMID("stsc")) {
	pAtom = new MP4StscAtom();
      } else if (ATOMID(type) == ATOMID("stco")) {
	pAtom = new MP4StcoAtom();
      } else if (ATOMID(type) == ATOMID("stss")) {
	pAtom = new MP4StssAtom();
      } else if (ATOMID(type) == ATOMID("stsh")) {
	pAtom = new MP4StshAtom();
      } else if (ATOMID(type) == ATOMID("stdp")) {
	pAtom = new MP4StdpAtom();
      } else if (ATOMID(type) == ATOMID("smhd")) {
	pAtom = new MP4SmhdAtom();
      } else if (ATOMID(type) == ATOMID("sdp ")) {
	pAtom = new MP4SdpAtom();
      } else if (ATOMID(type) == ATOMID("snro")) {
	pAtom = new MP4SnroAtom();
      } else if (ATOMID(type) == ATOMID("sync")) {
	pAtom = new MP4TrefTypeAtom(type);
      } else if (ATOMID(type) == ATOMID("skip")) {
	pAtom = new MP4FreeAtom();
	pAtom->SetType("skip");
      }
      break;
    case 't':
      if (ATOMID(type) == ATOMID("trak")) {
	pAtom = new MP4TrakAtom();
      } else if (ATOMID(type) == ATOMID("tkhd")) {
	pAtom = new MP4TkhdAtom();
      } else if (ATOMID(type) == ATOMID("tref")) {
	pAtom = new MP4TrefAtom();
      } else if (ATOMID(type) == ATOMID("traf")) {
	pAtom = new MP4TrafAtom();
      } else if (ATOMID(type) == ATOMID("tfhd")) {
	pAtom = new MP4TfhdAtom();
      } else if (ATOMID(type) == ATOMID("trex")) {
	pAtom = new MP4TrexAtom();
      } else if (ATOMID(type) == ATOMID("trun")) {
	pAtom = new MP4TrunAtom();
      } else if (ATOMID(type) == ATOMID("tmin")) {
	pAtom = new MP4TminAtom();
      } else if (ATOMID(type) == ATOMID("tmax")) {
	pAtom = new MP4TmaxAtom();
      } else if (ATOMID(type) == ATOMID("trpy")) {
	pAtom = new MP4TrpyAtom();
      } else if (ATOMID(type) == ATOMID("tpyl")) {
	pAtom = new MP4TpylAtom();
      } else if (ATOMID(type) == ATOMID("tims")) {
	pAtom = new MP4TimsAtom();
      } else if (ATOMID(type) == ATOMID("tsro")) {
	pAtom = new MP4TsroAtom();
      } else if (ATOMID(type) == ATOMID("trkn")) { // iTunes
	pAtom = new MP4TrknAtom();
      } else if (ATOMID(type) == ATOMID("tmpo")) { // iTunes
	pAtom = new MP4TmpoAtom();
      }
      break;
    case 'u':
      if (ATOMID(type) == ATOMID("udta")) {
	pAtom = new MP4UdtaAtom();
      } else if (ATOMID(type) == ATOMID("url ")) {
	pAtom = new MP4UrlAtom();
      } else if (ATOMID(type) == ATOMID("urn ")) {
	pAtom = new MP4UrnAtom();
      }
      break;
    case 'v':
      if (ATOMID(type) == ATOMID("vmhd")) {
	pAtom = new MP4VmhdAtom();
      }
      break;
    case 0251: { // copyright symbol 
static const char name[5]={0251,'n', 'a', 'm', '\0'};
static const char art[5]={0251,'A', 'R', 'T', '\0'};
static const char wrt[5]={0251,'w', 'r', 't', '\0'};
static const char alb[5]={0251,'a', 'l', 'b', '\0'};
static const char day[5]={0251,'d', 'a', 'y', '\0'};
static const char too[5]={0251,'t', 'o', 'o', '\0'};
static const char cmt[5]={0251,'c', 'm', 't', '\0'};
      if (ATOMID(type) == ATOMID(name)) {
 	pAtom = new MP4NamAtom();
      } else if (ATOMID(type) == ATOMID(art)) { /* Apple iTunes */
 	pAtom = new MP4ArtAtom();
      } else if (ATOMID(type) == ATOMID(wrt)) { /* Apple iTunes */
 	pAtom = new MP4WrtAtom();
      } else if (ATOMID(type) == ATOMID(alb)) { /* Apple iTunes */
 	pAtom = new MP4AlbAtom();
      } else if (ATOMID(type) == ATOMID(day)) { /* Apple iTunes */
 	pAtom = new MP4DayAtom();
      } else if (ATOMID(type) == ATOMID(too)) { /* Apple iTunes */
 	pAtom = new MP4TooAtom();
      } else if (ATOMID(type) == ATOMID(cmt)) { /* Apple iTunes */
 	pAtom = new MP4CmtAtom();
      }
      break;
    }
    case '-':
      if (ATOMID(type) == ATOMID("----")) { /* Apple iTunes */
 	pAtom = new MP4DashAtom();
      }
    }
  }

  if (pAtom == NULL) {
    pAtom = new MP4Atom(type);
    pAtom->SetUnknownType(true);
  }

  ASSERT(pAtom);
  return pAtom;
}

// generate a skeletal self

void MP4Atom::Generate()
{
	u_int32_t i;

	// for all properties
	for (i = 0; i < m_pProperties.Size(); i++) {
		// ask it to self generate
		m_pProperties[i]->Generate();
	}

	// for all mandatory, single child atom types
	for (i = 0; i < m_pChildAtomInfos.Size(); i++) {
		if (m_pChildAtomInfos[i]->m_mandatory
		  && m_pChildAtomInfos[i]->m_onlyOne) {

			// create the mandatory, single child atom
			MP4Atom* pChildAtom = 
				CreateAtom(m_pChildAtomInfos[i]->m_name);

			AddChildAtom(pChildAtom);

			// and ask it to self generate
			pChildAtom->Generate();
		}
	}
}

MP4Atom* MP4Atom::ReadAtom(MP4File* pFile, MP4Atom* pParentAtom)
{
	u_int8_t hdrSize = 8;
	u_int8_t extendedType[16];

	u_int64_t pos = pFile->GetPosition();

	VERBOSE_READ(pFile->GetVerbosity(), 
		printf("ReadAtom: pos = 0x"X64"\n", pos));

	u_int64_t dataSize = pFile->ReadUInt32();

	char type[5];
	pFile->ReadBytes((u_int8_t*)&type[0], 4);
	type[4] = '\0';
	
	// extended size
	if (dataSize == 1) {
		dataSize = pFile->ReadUInt64(); 
		hdrSize += 8;
	}

	// extended type
	if (ATOMID(type) == ATOMID("uuid")) {
		pFile->ReadBytes(extendedType, sizeof(extendedType));
		hdrSize += sizeof(extendedType);
	}

	if (dataSize == 0) {
		// extends to EOF
		dataSize = pFile->GetSize() - pos;
	}

	dataSize -= hdrSize;

	VERBOSE_READ(pFile->GetVerbosity(), 
		printf("ReadAtom: type = %s data-size = "U64" (0x"X64")\n", 
			type, dataSize, dataSize));

	if (pos + hdrSize + dataSize > pParentAtom->GetEnd()) {
		VERBOSE_READ(pFile->GetVerbosity(), 
			printf("ReadAtom: invalid atom size, extends outside parent atom\n"));
		throw new MP4Error("invalid atom size", "ReadAtom");
	}


	MP4Atom* pAtom = CreateAtom(type);
	pAtom->SetFile(pFile);
	pAtom->SetStart(pos);
	pAtom->SetEnd(pos + hdrSize + dataSize);
	pAtom->SetSize(dataSize);
	if (ATOMID(type) == ATOMID("uuid")) {
		pAtom->SetExtendedType(extendedType);
	}
	if (pAtom->IsUnknownType()) {
		if (!IsReasonableType(pAtom->GetType())) {
			VERBOSE_READ(pFile->GetVerbosity(),
				printf("Warning: atom type %s is suspect\n", pAtom->GetType()));
		} else {
			VERBOSE_READ(pFile->GetVerbosity(),
				printf("Info: atom type %s is unknown\n", pAtom->GetType()));
		}

		if (dataSize > 0) {
			pAtom->AddProperty(
				new MP4BytesProperty("data", dataSize));
		}
	}

	pAtom->SetParentAtom(pParentAtom);

	pAtom->Read();

	return pAtom;
}