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winamp/Src/external_dependencies/libmp4v2/mp4atom.cpp
Jef 0954e03b3a Initial community commit
2024-09-24 14:54:57 +02:00

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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.
*
* Portions created by Adnecto d.o.o. are
* Copyright (C) Adnecto d.o.o. 2005. All Rights Reserved
*
* Contributor(s):
* Dave Mackie dmackie@cisco.com
* Alix Marchandise-Franquet alix@cisco.com
* Ximpo Group Ltd. mp4v2@ximpo.com
* Danijel Kopcinovic danijel.kopcinovic@adnecto.net
*/
#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;
memset(m_extendedType, 0, sizeof(m_extendedType));
}
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 'a':
if (ATOMID(type) == ATOMID("avc1")) {
pAtom = new MP4Avc1Atom();
} else if (ATOMID(type) == ATOMID("avcC")) {
pAtom = new MP4AvcCAtom();
} else if (ATOMID(type) == ATOMID("alis")) {
pAtom = new MP4UrlAtom("alis");
} else if (ATOMID(type) == ATOMID("alaw")) {
pAtom = new MP4SoundAtom(type);
} else if (ATOMID(type) == ATOMID("alac")) {
pAtom = new MP4SoundAtom(type);
} else if (ATOMID(type) == ATOMID("albm")) {
pAtom = new MP4Meta3Atom(type);
}
break;
case 'c':
if (ATOMID(type) == ATOMID("chap")) {
pAtom = new MP4TrefTypeAtom(type);
} else if (ATOMID(type) == ATOMID("chpl")) {
pAtom = new MP4ChplAtom();
}
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("dref")) {
pAtom = new MP4DrefAtom();
} else if (ATOMID(type) == ATOMID("dpnd")) {
pAtom = new MP4TrefTypeAtom(type);
} else if (ATOMID(type) == ATOMID("data")) { /* Apple iTunes */
pAtom = new MP4DataAtom();
}
break;
case 'e':
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("ftyp")) {
pAtom = new MP4FtypAtom();
}
break;
case 'g':
if (ATOMID(type) == ATOMID("gmin")) {
pAtom = new MP4GminAtom();
}/* else if (ATOMID(type) == ATOMID("gnre")) { // TODO: benski look at atom_rtp for implementation of two atom types with same name
pAtom = new MP4Meta3Atom(type);
} */
break;
case 'h':
if (ATOMID(type) == ATOMID("hdlr")) {
pAtom = new MP4HdlrAtom();
} 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();
} else if (ATOMID(type) == ATOMID("h263")) {
pAtom = new MP4VideoAtom("h263");
} else if (ATOMID(type) == ATOMID("href")) {
pAtom = new MP4HrefAtom();
}
break;
case 'i':
if (ATOMID(type) == ATOMID("ipir")) {
pAtom = new MP4TrefTypeAtom(type);
} else if (ATOMID(type) == ATOMID("ima4")) {
pAtom = new MP4SoundAtom("ima4");
}
break;
case 'j':
if (ATOMID(type) == ATOMID("jpeg")) {
pAtom = new MP4VideoAtom("jpeg");
}
break;
case 'm':
if (ATOMID(type) == ATOMID("mdhd")) {
pAtom = new MP4MdhdAtom();
} else if (ATOMID(type) == ATOMID("mvhd")) {
pAtom = new MP4MvhdAtom();
} else if (ATOMID(type) == ATOMID("mdat")) {
pAtom = new MP4MdatAtom();
} else if (ATOMID(type) == ATOMID("mpod")) {
pAtom = new MP4TrefTypeAtom(type);
} else if (ATOMID(type) == ATOMID("mp4a")) {
pAtom = new MP4SoundAtom("mp4a");
} else if (ATOMID(type) == ATOMID("mp4s")) {
pAtom = new MP4Mp4sAtom();
} else if (ATOMID(type) == ATOMID("mp4v")) {
pAtom = new MP4Mp4vAtom();
} else if (ATOMID(type) == ATOMID("mean")) { // iTunes
pAtom = new MP4Meta1Atom(type);
}
break;
case 'n':
if (ATOMID(type) == ATOMID("name")) { // iTunes
pAtom = new MP4Meta1Atom(type);
}
break;
case 'o':
if (ATOMID(type) == ATOMID("ohdr")) {
pAtom = new MP4OhdrAtom();
}
break;
case 'p':
if (ATOMID(type) == ATOMID("perf")) {
pAtom = new MP4Meta3Atom(type);
}
break;
case 'r':
if (ATOMID(type) == ATOMID("rtp ")) {
pAtom = new MP4RtpAtom();
} else if (ATOMID(type) == ATOMID("raw ")) {
pAtom = new MP4VideoAtom("raw ");
}
break;
case 's':
if (ATOMID(type) == ATOMID("s263")) {
pAtom = new MP4S263Atom();
} else if (ATOMID(type) == ATOMID("samr")) {
pAtom = new MP4AmrAtom("samr");
} else if (ATOMID(type) == ATOMID("sawb")) {
pAtom = new MP4AmrAtom("sawb");
} else if (ATOMID(type) == ATOMID("stbl")) {
pAtom = new MP4StblAtom();
} else if (ATOMID(type) == ATOMID("stsd")) {
pAtom = new MP4StsdAtom();
} else if (ATOMID(type) == ATOMID("stsz")) {
pAtom = new MP4StszAtom();
} else if (ATOMID(type) == ATOMID("stsc")) {
pAtom = new MP4StscAtom();
} else if (ATOMID(type) == ATOMID("stz2")) {
pAtom = new MP4Stz2Atom();
} else if (ATOMID(type) == ATOMID("stdp")) {
pAtom = new MP4StdpAtom();
} else if (ATOMID(type) == ATOMID("sdp ")) {
pAtom = new MP4SdpAtom();
} else if (ATOMID(type) == ATOMID("sync")) {
pAtom = new MP4TrefTypeAtom(type);
} else if (ATOMID(type) == ATOMID("skip")) {
pAtom = new MP4FreeAtom();
pAtom->SetType("skip");
} else if (ATOMID(type) == ATOMID("sowt")) {
pAtom = new MP4SoundAtom("sowt");
}
break;
case 't':
if (ATOMID(type) == ATOMID("text")) {
pAtom = new MP4TextAtom();
} else if (ATOMID(type) == ATOMID("tkhd")) {
pAtom = new MP4TkhdAtom();
} else if (ATOMID(type) == ATOMID("tfhd")) {
pAtom = new MP4TfhdAtom();
} else if (ATOMID(type) == ATOMID("trun")) {
pAtom = new MP4TrunAtom();
} else if (ATOMID(type) == ATOMID("twos")) {
pAtom = new MP4SoundAtom("twos");
} else if (ATOMID(type) == ATOMID("titl")) {
pAtom = new MP4Meta3Atom(type);
}
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();
} else if (ATOMID(type) == ATOMID("ulaw")) {
pAtom = new MP4SoundAtom("ulaw");
}
break;
case 'v':
if (ATOMID(type) == ATOMID("vmhd")) {
pAtom = new MP4VmhdAtom();
}
break;
case 'y':
if (ATOMID(type) == ATOMID("yuv2")) {
pAtom = new MP4VideoAtom("yuv2");
}
else if (ATOMID(type) == ATOMID("yrrc")) {
pAtom = new MP4Meta4Atom(type);
}
break;
case 'S':
if (ATOMID(type) == ATOMID("SVQ3")) {
pAtom = new MP4VideoAtom("SVQ3");
} else if (ATOMID(type) == ATOMID("SMI ")) {
pAtom = new MP4SmiAtom();
}
break;
case 0251:
static const char name[5]={'\xA9','n', 'a', 'm', '\0'};
static const char cmt[5]={'\xA9','c', 'm', 't', '\0'};
static const char cpy[5]={'\xA9','c', 'p', 'y', '\0'};
static const char des[5]={'\xA9','d', 'e', 's','\0'};
static const char prd[5]={'\xA9', 'p', 'r', 'd', '\0'};
static const char lyr[5]={'\xA9', 'l', 'y', 'r', '\0'};
if (ATOMID(type) == ATOMID(name) ||
ATOMID(type) == ATOMID(cmt) ||
ATOMID(type) == ATOMID(cpy) ||
ATOMID(type) == ATOMID(prd) ||
ATOMID(type) == ATOMID(des) ||
ATOMID(type) == ATOMID(lyr)) {
pAtom = new MP4Meta2Atom(type);
}
break;
}
}
if (pAtom == NULL) {
pAtom = new MP4StandardAtom(type);
// unknown type is set by StandardAtom type
}
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;
pFile->Check64BitStatus(type);
}
// 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") hdr %u\n",
type, dataSize, dataSize, hdrSize));
if (pos + hdrSize + dataSize > pParentAtom->GetEnd()) {
VERBOSE_ERROR(pFile->GetVerbosity(),
printf("ReadAtom: invalid atom size, extends outside parent atom - skipping to end of \"%s\" \"%s\" "U64" vs "U64"\n",
pParentAtom->GetType(), type,
pos + hdrSize + dataSize,
pParentAtom->GetEnd()));
VERBOSE_READ(pFile->GetVerbosity(),
printf("parent %s ("U64") pos "U64" hdr %d data "U64" sum "U64"\n",
pParentAtom->GetType(),
pParentAtom->GetEnd(),
pos,
hdrSize,
dataSize,
pos + hdrSize + dataSize));
#if 0
throw new MP4Error("invalid atom size", "ReadAtom");
#else
//pFile->SetPosition(pParentAtom->GetEnd());
//return 0;
// TODO: benski> we should re-enable this if we can find a good way to very that the datasize might be correct.
// skip to end of atom
dataSize = pParentAtom->GetEnd() - pos - hdrSize;
#endif
}
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;
}
bool MP4Atom::IsReasonableType(const char* type)
{
for (u_int8_t i = 0; i < 4; i++) {
if (iscntrl((unsigned char)type[i])) {
return false;
}
if (i == 3 && type[i] == ' ') {
continue;
}
return false;
}
return true;
}
// generic read
void MP4Atom::Read()
{
ASSERT(m_pFile);
if (ATOMID(m_type) != 0 && m_size > 1000000) {
VERBOSE_READ(GetVerbosity(),
printf("Warning: %s atom size "U64" is suspect\n",
m_type, m_size));
}
ReadProperties();
// read child atoms, if we expect there to be some
if (m_pChildAtomInfos.Size() > 0) {
ReadChildAtoms();
}
Skip(); // to end of atom
}
void MP4Atom::Skip()
{
if (m_pFile->GetPosition() != m_end) {
VERBOSE_READ(m_pFile->GetVerbosity(),
printf("Skip: "U64" bytes\n", m_end - m_pFile->GetPosition()));
}
m_pFile->SetPosition(m_end);
}
MP4Atom* MP4Atom::FindAtomMP4(const char* name)
{
if (!IsMe(name)) {
return NULL;
}
if (!IsRootAtom()) {
VERBOSE_FIND(m_pFile->GetVerbosity(),
printf("FindAtomMP4: matched %s\n", name));
name = MP4NameAfterFirst(name);
// I'm the sought after atom
if (name == NULL) {
return this;
}
}
// else it's one of my children
return FindChildAtom(name);
}
bool MP4Atom::FindProperty(const char *name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (!IsMe(name)) {
return false;
}
if (!IsRootAtom()) {
VERBOSE_FIND(m_pFile->GetVerbosity(),
printf("FindProperty: matched %s\n", name));
name = MP4NameAfterFirst(name);
// no property name given
if (name == NULL) {
return false;
}
}
return FindContainedProperty(name, ppProperty, pIndex);
}
bool MP4Atom::IsMe(const char* name)
{
if (name == NULL) {
return false;
}
// root atom always matches
if (!strcmp(m_type, "")) {
return true;
}
// check if our atom name is specified as the first component
if (!MP4NameFirstMatches(m_type, name)) {
return false;
}
return true;
}
MP4Atom* MP4Atom::FindChildAtom(const char* name)
{
u_int32_t atomIndex = 0;
// get the index if we have one, e.g. moov.trak[2].mdia...
(void)MP4NameFirstIndex(name, &atomIndex);
// need to get to the index'th child atom of the right type
for (u_int32_t i = 0; i < m_pChildAtoms.Size(); i++) {
if (MP4NameFirstMatches(m_pChildAtoms[i]->GetType(), name)) {
if (atomIndex == 0) {
// this is the one, ask it to match
return m_pChildAtoms[i]->FindAtomMP4(name);
}
atomIndex--;
}
}
return NULL;
}
bool MP4Atom::FindContainedProperty(const char *name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
u_int32_t numProperties = m_pProperties.Size();
u_int32_t i;
// check all of our properties
for (i = 0; i < numProperties; i++) {
if (m_pProperties[i]->FindProperty(name, ppProperty, pIndex)) {
return true;
}
}
// not one of our properties,
// presumably one of our children's properties
// check child atoms...
// check if we have an index, e.g. trak[2].mdia...
u_int32_t atomIndex = 0;
(void)MP4NameFirstIndex(name, &atomIndex);
// need to get to the index'th child atom of the right type
for (i = 0; i < m_pChildAtoms.Size(); i++) {
if (MP4NameFirstMatches(m_pChildAtoms[i]->GetType(), name)) {
if (atomIndex == 0) {
// this is the one, ask it to match
return m_pChildAtoms[i]->FindProperty(name, ppProperty, pIndex);
}
atomIndex--;
}
}
VERBOSE_FIND(m_pFile->GetVerbosity(),
printf("FindProperty: no match for %s\n", name));
return false;
}
void MP4Atom::ReadProperties(u_int32_t startIndex, u_int32_t count)
{
u_int32_t numProperties = MIN(count, m_pProperties.Size() - startIndex);
// read any properties of the atom
for (u_int32_t i = startIndex; i < startIndex + numProperties; i++) {
m_pProperties[i]->Read(m_pFile);
if (m_pFile->GetPosition() > m_end) {
VERBOSE_READ(GetVerbosity(),
printf("ReadProperties: insufficient data for property: %s pos 0x"X64" atom end 0x"X64"\n",
m_pProperties[i]->GetName(),
m_pFile->GetPosition(), m_end));
// benski> throw new MP4Error("atom is too small", "Atom ReadProperties");
return;
}
}
}
void MP4Atom::ReadChildAtoms()
{
bool this_is_udta = ATOMID(m_type) == ATOMID("udta");
VERBOSE_READ(GetVerbosity(),
printf("ReadChildAtoms: of %s\n", m_type[0] ? m_type : "root"));
for (u_int64_t position = m_pFile->GetPosition();
position < m_end;
position = m_pFile->GetPosition()) {
// make sure that we have enough to read at least 8 bytes
// size and type.
if (m_end - position < 2 * sizeof(uint32_t)) {
// if we're reading udta, it's okay to have 4 bytes of 0
if (this_is_udta &&
m_end - position == sizeof(uint32_t)) {
u_int32_t mbz = m_pFile->ReadUInt32();
if (mbz != 0) {
VERBOSE_WARNING(GetVerbosity(),
printf("Error: In udta atom, end value is not zero %x\n",
mbz));
}
continue;
}
// otherwise, output a warning, but don't care
VERBOSE_WARNING(GetVerbosity(),
printf("Error: In %s atom, extra "D64" bytes at end of atom\n",
m_type, (m_end - position)));
for (uint64_t ix = 0; ix < m_end - position; ix++) {
(void)m_pFile->ReadUInt8();
}
continue;
}
MP4Atom* pChildAtom = MP4Atom::ReadAtom(m_pFile, this);
if (pChildAtom)
{
AddChildAtom(pChildAtom);
MP4AtomInfo* pChildAtomInfo = FindAtomInfo(pChildAtom->GetType());
// if child atom is of known type
// but not expected here print warning
if (pChildAtomInfo == NULL && !pChildAtom->IsUnknownType()) {
VERBOSE_READ(GetVerbosity(),
printf("Warning: In atom %s unexpected child atom %s\n",
GetType(), pChildAtom->GetType()));
}
// if child atoms should have just one instance
// and this is more than one, print warning
if (pChildAtomInfo) {
pChildAtomInfo->m_count++;
if (pChildAtomInfo->m_onlyOne && pChildAtomInfo->m_count > 1) {
VERBOSE_READ(GetVerbosity(),
printf("Warning: In atom %s multiple child atoms %s\n",
GetType(), pChildAtom->GetType()));
}
}
}
}
// if mandatory child atom doesn't exist, print warning
u_int32_t numAtomInfo = m_pChildAtomInfos.Size();
for (u_int32_t i = 0; i < numAtomInfo; i++) {
if (m_pChildAtomInfos[i]->m_mandatory
&& m_pChildAtomInfos[i]->m_count == 0) {
VERBOSE_READ(GetVerbosity(),
printf("Warning: In atom %s missing child atom %s\n",
GetType(), m_pChildAtomInfos[i]->m_name));
}
}
VERBOSE_READ(GetVerbosity(),
printf("ReadChildAtoms: finished %s\n", m_type));
}
MP4AtomInfo* MP4Atom::FindAtomInfo(const char* name)
{
u_int32_t numAtomInfo = m_pChildAtomInfos.Size();
for (u_int32_t i = 0; i < numAtomInfo; i++) {
if (ATOMID(m_pChildAtomInfos[i]->m_name) == ATOMID(name)) {
return m_pChildAtomInfos[i];
}
}
return NULL;
}
// generic write
void MP4Atom::Write()
{
ASSERT(m_pFile);
BeginWrite();
WriteProperties();
WriteChildAtoms();
FinishWrite();
}
void MP4Atom::Rewrite()
{
ASSERT(m_pFile);
if (!m_end) {
// This atom hasn't been written yet...
return;
}
u_int64_t fPos = m_pFile->GetPosition();
m_pFile->SetPosition(GetStart());
Write();
m_pFile->SetPosition(fPos);
}
void MP4Atom::BeginWrite(bool use64)
{
m_start = m_pFile->GetPosition();
//use64 = m_pFile->Use64Bits();
if (use64) {
m_pFile->WriteUInt32(1);
} else {
m_pFile->WriteUInt32(0);
}
m_pFile->WriteBytes((u_int8_t*)&m_type[0], 4);
if (use64) {
m_pFile->WriteUInt64(0);
}
if (ATOMID(m_type) == ATOMID("uuid")) {
m_pFile->WriteBytes(m_extendedType, sizeof(m_extendedType));
}
}
void MP4Atom::FinishWrite(bool use64)
{
m_end = m_pFile->GetPosition();
m_size = (m_end - m_start);
VERBOSE_WRITE(GetVerbosity(),
printf("end: type %s "U64" "U64" size "U64"\n", m_type,
m_start, m_end,
m_size));
//use64 = m_pFile->Use64Bits();
if (use64) {
m_pFile->SetPosition(m_start + 8);
m_pFile->WriteUInt64(m_size);
} else {
ASSERT(m_size <= (u_int64_t)0xFFFFFFFF);
m_pFile->SetPosition(m_start);
m_pFile->WriteUInt32(m_size);
}
m_pFile->SetPosition(m_end);
// adjust size to just reflect data portion of atom
m_size -= (use64 ? 16 : 8);
if (ATOMID(m_type) == ATOMID("uuid")) {
m_size -= sizeof(m_extendedType);
}
}
void MP4Atom::WriteProperties(u_int32_t startIndex, u_int32_t count)
{
u_int32_t numProperties = MIN(count, m_pProperties.Size() - startIndex);
VERBOSE_WRITE(GetVerbosity(),
printf("Write: type %s\n", m_type));
for (u_int32_t i = startIndex; i < startIndex + numProperties; i++) {
m_pProperties[i]->Write(m_pFile);
}
}
void MP4Atom::WriteChildAtoms()
{
u_int32_t size = m_pChildAtoms.Size();
for (u_int32_t i = 0; i < size; i++) {
m_pChildAtoms[i]->Write();
}
VERBOSE_WRITE(GetVerbosity(),
printf("Write: finished %s\n", m_type));
}
void MP4Atom::AddProperty(MP4Property* pProperty)
{
ASSERT(pProperty);
m_pProperties.Add(pProperty);
pProperty->SetParentAtom(this);
}
void MP4Atom::AddVersionAndFlags()
{
AddProperty(new MP4Integer8Property("version"));
AddProperty(new MP4Integer24Property("flags"));
}
void MP4Atom::AddReserved(char* name, u_int32_t size)
{
MP4BytesProperty* pReserved = new MP4BytesProperty(name, size);
pReserved->SetReadOnly();
AddProperty(pReserved);
}
void MP4Atom::ExpectChildAtom(const char* name, bool mandatory, bool onlyOne)
{
m_pChildAtomInfos.Add(new MP4AtomInfo(name, mandatory, onlyOne));
}
u_int8_t MP4Atom::GetVersion()
{
if (strcmp("version", m_pProperties[0]->GetName())) {
return 0;
}
return ((MP4Integer8Property*)m_pProperties[0])->GetValue();
}
void MP4Atom::SetVersion(u_int8_t version)
{
if (strcmp("version", m_pProperties[0]->GetName())) {
return;
}
((MP4Integer8Property*)m_pProperties[0])->SetValue(version);
}
u_int32_t MP4Atom::GetFlags()
{
if (strcmp("flags", m_pProperties[1]->GetName())) {
return 0;
}
return ((MP4Integer24Property*)m_pProperties[1])->GetValue();
}
void MP4Atom::SetFlags(u_int32_t flags)
{
if (strcmp("flags", m_pProperties[1]->GetName())) {
return;
}
((MP4Integer24Property*)m_pProperties[1])->SetValue(flags);
}
u_int32_t MP4Atom::GetVerbosity()
{
ASSERT(m_pFile);
return m_pFile->GetVerbosity();
}
u_int8_t MP4Atom::GetDepth()
{
if (m_depth < 0xFF) {
return m_depth;
}
MP4Atom *pAtom = this;
m_depth = 0;
while ((pAtom = pAtom->GetParentAtom()) != NULL) {
m_depth++;
ASSERT(m_depth < 255);
}
return m_depth;
}
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