ref: 038d26cd2251feec441a438a5b54b733aa025039
dir: /common/mp4v2/mp4file.cpp/
/*
* 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 dmackie@cisco.com
*/
#include "mp4common.h"
MP4File::MP4File(u_int32_t verbosity)
{
m_fileName = NULL;
m_pFile = NULL;
m_orgFileSize = 0;
m_fileSize = 0;
m_pRootAtom = NULL;
m_odTrackId = MP4_INVALID_TRACK_ID;
m_verbosity = verbosity;
m_mode = 0;
m_use64bits = false;
m_useIsma = false;
m_pModificationProperty = NULL;
m_pTimeScaleProperty = NULL;
m_pDurationProperty = NULL;
m_memoryBuffer = NULL;
m_memoryBufferSize = 0;
m_memoryBufferPosition = 0;
m_numReadBits = 0;
m_bufReadBits = 0;
m_numWriteBits = 0;
m_bufWriteBits = 0;
#ifdef USE_FILE_CALLBACKS
// These are the default for when no callbacks are specified
m_userData = (void*)this;
m_MP4fopen = MP4fopen_cb;
m_MP4fclose = MP4fclose_cb;
m_MP4fread = MP4fread_cb;
m_MP4fwrite = MP4fwrite_cb;
m_MP4fgetpos = MP4fgetpos_cb;
m_MP4fsetpos = MP4fsetpos_cb;
m_MP4filesize = MP4filesize_cb;
#endif
}
MP4File::~MP4File()
{
MP4Free(m_fileName);
delete m_pRootAtom;
for (u_int32_t i = 0; i < m_pTracks.Size(); i++) {
delete m_pTracks[i];
}
MP4Free(m_memoryBuffer); // just in case
}
void MP4File::Read(const char* fileName)
{
m_fileName = MP4Stralloc(fileName);
m_mode = 'r';
Open("rb");
ReadFromFile();
CacheProperties();
}
void MP4File::Create(const char* fileName, bool use64bits)
{
m_fileName = MP4Stralloc(fileName);
m_mode = 'w';
m_use64bits = use64bits;
Open("wb+");
// generate a skeletal atom tree
m_pRootAtom = MP4Atom::CreateAtom(NULL);
m_pRootAtom->SetFile(this);
m_pRootAtom->Generate();
CacheProperties();
// create mdat, and insert it after ftyp, and before moov
InsertChildAtom(m_pRootAtom, "mdat", 1);
// start writing
m_pRootAtom->BeginWrite();
}
void MP4File::Modify(const char* fileName)
{
m_fileName = MP4Stralloc(fileName);
m_mode = 'r';
Open("rb+");
ReadFromFile();
m_mode = 'w';
// find the moov atom
MP4Atom* pMoovAtom = m_pRootAtom->FindAtom("moov");
u_int32_t numAtoms;
if (pMoovAtom == NULL) {
// there isn't one, odd but we can still proceed
pMoovAtom = AddChildAtom(m_pRootAtom, "moov");
} else {
numAtoms = m_pRootAtom->GetNumberOfChildAtoms();
// work backwards thru the top level atoms
int32_t i;
bool lastAtomIsMoov = true;
MP4Atom* pLastAtom = NULL;
for (i = numAtoms - 1; i >= 0; i--) {
MP4Atom* pAtom = m_pRootAtom->GetChildAtom(i);
const char* type = pAtom->GetType();
// get rid of any trailing free or skips
if (!strcmp(type, "free") || !strcmp(type, "skip")) {
m_pRootAtom->DeleteChildAtom(pAtom);
continue;
}
if (strcmp(type, "moov")) {
if (pLastAtom == NULL) {
pLastAtom = pAtom;
lastAtomIsMoov = false;
}
continue;
}
// now at moov atom
// multiple moov atoms?!?
if (pAtom != pMoovAtom) {
throw new MP4Error(
"Badly formed mp4 file, multiple moov atoms",
"MP4Modify");
}
if (lastAtomIsMoov) {
// position to start of moov atom,
// effectively truncating file
// prior to adding new mdat
SetPosition(pMoovAtom->GetStart());
} else { // last atom isn't moov
// need to place a free atom
MP4Atom* pFreeAtom = MP4Atom::CreateAtom("free");
// in existing position of the moov atom
m_pRootAtom->InsertChildAtom(pFreeAtom, i);
m_pRootAtom->DeleteChildAtom(pMoovAtom);
m_pRootAtom->AddChildAtom(pMoovAtom);
// write free atom to disk
SetPosition(pMoovAtom->GetStart());
pFreeAtom->SetSize(pMoovAtom->GetSize());
pFreeAtom->Write();
// finally set our file position to the end of the last atom
SetPosition(pLastAtom->GetEnd());
}
break;
}
ASSERT(i != -1);
}
CacheProperties(); // of moov atom
numAtoms = m_pRootAtom->GetNumberOfChildAtoms();
// insert another mdat prior to moov atom (the last atom)
MP4Atom* pMdatAtom = InsertChildAtom(m_pRootAtom, "mdat", numAtoms - 1);
// start writing new mdat
pMdatAtom->BeginWrite();
}
void MP4File::Optimize(const char* orgFileName, const char* newFileName)
{
#ifndef USE_FILE_CALLBACKS
m_fileName = MP4Stralloc(orgFileName);
m_mode = 'r';
// first load meta-info into memory
Open("rb");
ReadFromFile();
CacheProperties(); // of moov atom
// now switch over to writing the new file
MP4Free(m_fileName);
// create a temporary file if necessary
if (newFileName == NULL) {
m_fileName = MP4Stralloc(TempFileName());
} else {
m_fileName = MP4Stralloc(newFileName);
}
FILE* pReadFile = m_pFile;
m_pFile = NULL;
m_mode = 'w';
Open("wb");
SetIntegerProperty("moov.mvhd.modificationTime",
MP4GetAbsTimestamp());
// writing meta info in the optimal order
((MP4RootAtom*)m_pRootAtom)->BeginOptimalWrite();
// write data in optimal order
RewriteMdat(pReadFile, m_pFile);
// finish writing
((MP4RootAtom*)m_pRootAtom)->FinishOptimalWrite();
// cleanup
fclose(m_pFile);
m_pFile = NULL;
fclose(pReadFile);
// move temporary file into place
if (newFileName == NULL) {
Rename(m_fileName, orgFileName);
}
#else
throw new MP4Error(errno, "Function not supported when using callbacks", "MP4Optimize");
#endif
}
void MP4File::RewriteMdat(FILE* pReadFile, FILE* pWriteFile)
{
u_int32_t numTracks = m_pTracks.Size();
MP4ChunkId* chunkIds = new MP4ChunkId[numTracks];
MP4ChunkId* maxChunkIds = new MP4ChunkId[numTracks];
MP4Timestamp* nextChunkTimes = new MP4Timestamp[numTracks];
for (u_int32_t i = 0; i < numTracks; i++) {
chunkIds[i] = 1;
maxChunkIds[i] = m_pTracks[i]->GetNumberOfChunks();
nextChunkTimes[i] = MP4_INVALID_TIMESTAMP;
}
while (true) {
u_int32_t nextTrackIndex = (u_int32_t)-1;
MP4Timestamp nextTime = MP4_INVALID_TIMESTAMP;
for (u_int32_t i = 0; i < numTracks; i++) {
if (chunkIds[i] > maxChunkIds[i]) {
continue;
}
if (nextChunkTimes[i] == MP4_INVALID_TIMESTAMP) {
MP4Timestamp chunkTime =
m_pTracks[i]->GetChunkTime(chunkIds[i]);
nextChunkTimes[i] = MP4ConvertTime(chunkTime,
m_pTracks[i]->GetTimeScale(), GetTimeScale());
}
// time is not earliest so far
if (nextChunkTimes[i] > nextTime) {
continue;
}
// prefer hint tracks to media tracks if times are equal
if (nextChunkTimes[i] == nextTime
&& strcmp(m_pTracks[i]->GetType(), MP4_HINT_TRACK_TYPE)) {
continue;
}
// this is our current choice of tracks
nextTime = nextChunkTimes[i];
nextTrackIndex = i;
}
if (nextTrackIndex == (u_int32_t)-1) {
break;
}
// point into original mp4 file for read chunk call
m_pFile = pReadFile;
m_mode = 'r';
u_int8_t* pChunk;
u_int32_t chunkSize;
m_pTracks[nextTrackIndex]->
ReadChunk(chunkIds[nextTrackIndex], &pChunk, &chunkSize);
// point back at the new mp4 file for write chunk
m_pFile = pWriteFile;
m_mode = 'w';
m_pTracks[nextTrackIndex]->
RewriteChunk(chunkIds[nextTrackIndex], pChunk, chunkSize);
MP4Free(pChunk);
chunkIds[nextTrackIndex]++;
nextChunkTimes[nextTrackIndex] = MP4_INVALID_TIMESTAMP;
}
delete [] chunkIds;
delete [] maxChunkIds;
delete [] nextChunkTimes;
}
void MP4File::Open(const char* fmode)
{
ASSERT(m_pFile == NULL);
#ifndef USE_FILE_CALLBACKS
#ifdef O_LARGEFILE
// UGH! fopen doesn't open a file in 64-bit mode, period.
// So we need to use open() and then fdopen()
int fd;
int flags = O_LARGEFILE;
if (strchr(fmode, '+')) {
flags |= O_CREAT | O_RDWR;
if (fmode[0] == 'w') {
flags |= O_TRUNC;
}
} else {
if (fmode[0] == 'w') {
flags |= O_CREAT | O_TRUNC | O_WRONLY;
} else {
flags |= O_RDONLY;
}
}
fd = open(m_fileName, flags, 0666);
if (fd >= 0) {
m_pFile = fdopen(fd, fmode);
}
#else
m_pFile = fopen(m_fileName, fmode);
#endif
if (m_pFile == NULL) {
throw new MP4Error(errno, "failed", "MP4Open");
}
#else
u_int32_t rc = m_MP4fopen(m_fileName, fmode, m_userData);
if (rc == 0) {
throw new MP4Error(errno, "failed", "MP4Open");
}
#endif
if (m_mode == 'r') {
#ifndef USE_FILE_CALLBACKS
struct stat s;
if (fstat(fileno(m_pFile), &s) < 0) {
throw new MP4Error(errno, "stat failed", "MP4Open");
}
m_orgFileSize = m_fileSize = s.st_size;
#else
int64_t s = m_MP4filesize(m_userData);
if (s < 0) {
throw new MP4Error(errno, "retreiving filesize failed", "MP4Open");
}
m_orgFileSize = m_fileSize = (u_int64_t)s;
#endif
} else {
m_orgFileSize = m_fileSize = 0;
}
}
void MP4File::ReadFromFile()
{
// ensure we start at beginning of file
SetPosition(0);
// create a new root atom
ASSERT(m_pRootAtom == NULL);
m_pRootAtom = MP4Atom::CreateAtom(NULL);
u_int64_t fileSize = GetSize();
m_pRootAtom->SetFile(this);
m_pRootAtom->SetStart(0);
m_pRootAtom->SetSize(fileSize);
m_pRootAtom->SetEnd(fileSize);
m_pRootAtom->Read();
// create MP4Track's for any tracks in the file
GenerateTracks();
}
void MP4File::GenerateTracks()
{
u_int32_t trackIndex = 0;
while (true) {
char trackName[32];
snprintf(trackName, sizeof(trackName), "moov.trak[%u]", trackIndex);
// find next trak atom
MP4Atom* pTrakAtom = m_pRootAtom->FindAtom(trackName);
// done, no more trak atoms
if (pTrakAtom == NULL) {
break;
}
// find track id property
MP4Integer32Property* pTrackIdProperty = NULL;
pTrakAtom->FindProperty(
"trak.tkhd.trackId",
(MP4Property**)&pTrackIdProperty);
// find track type property
MP4StringProperty* pTypeProperty = NULL;
pTrakAtom->FindProperty(
"trak.mdia.hdlr.handlerType",
(MP4Property**)&pTypeProperty);
// ensure we have the basics properties
if (pTrackIdProperty && pTypeProperty) {
m_trakIds.Add(pTrackIdProperty->GetValue());
MP4Track* pTrack = NULL;
try {
if (!strcmp(pTypeProperty->GetValue(), MP4_HINT_TRACK_TYPE)) {
pTrack = new MP4RtpHintTrack(this, pTrakAtom);
} else {
pTrack = new MP4Track(this, pTrakAtom);
}
m_pTracks.Add(pTrack);
}
catch (MP4Error* e) {
VERBOSE_ERROR(m_verbosity, e->Print());
delete e;
}
// remember when we encounter the OD track
if (pTrack && !strcmp(pTrack->GetType(), MP4_OD_TRACK_TYPE)) {
if (m_odTrackId == MP4_INVALID_TRACK_ID) {
m_odTrackId = pTrackIdProperty->GetValue();
} else {
VERBOSE_READ(GetVerbosity(),
printf("Warning: multiple OD tracks present\n"));
}
}
} else {
m_trakIds.Add(0);
}
trackIndex++;
}
}
void MP4File::CacheProperties()
{
FindIntegerProperty("moov.mvhd.modificationTime",
(MP4Property**)&m_pModificationProperty);
FindIntegerProperty("moov.mvhd.timeScale",
(MP4Property**)&m_pTimeScaleProperty);
FindIntegerProperty("moov.mvhd.duration",
(MP4Property**)&m_pDurationProperty);
}
void MP4File::BeginWrite()
{
m_pRootAtom->BeginWrite();
}
void MP4File::FinishWrite()
{
// for all tracks, flush chunking buffers
for (u_int32_t i = 0; i < m_pTracks.Size(); i++) {
ASSERT(m_pTracks[i]);
m_pTracks[i]->FinishWrite();
}
// ask root atom to write
m_pRootAtom->FinishWrite();
// check if file shrunk, e.g. we deleted a track
if (GetSize() < m_orgFileSize) {
// just use a free atom to mark unused space
// MP4Optimize() should be used to clean up this space
MP4Atom* pFreeAtom = MP4Atom::CreateAtom("free");
ASSERT(pFreeAtom);
pFreeAtom->SetFile(this);
pFreeAtom->SetSize(MAX(m_orgFileSize - (m_fileSize + 8), 0));
pFreeAtom->Write();
delete pFreeAtom;
}
}
MP4Duration MP4File::UpdateDuration(MP4Duration duration)
{
MP4Duration currentDuration = GetDuration();
if (duration > currentDuration) {
SetDuration(duration);
return duration;
}
return currentDuration;
}
void MP4File::Dump(FILE* pDumpFile, bool dumpImplicits)
{
if (pDumpFile == NULL) {
pDumpFile = stdout;
}
fprintf(pDumpFile, "Dumping %s meta-information...\n", m_fileName);
m_pRootAtom->Dump(pDumpFile, 0, dumpImplicits);
}
void MP4File::Close()
{
if (m_mode == 'w') {
SetIntegerProperty("moov.mvhd.modificationTime",
MP4GetAbsTimestamp());
FinishWrite();
}
#ifndef USE_FILE_CALLBACKS
fclose(m_pFile);
m_pFile = NULL;
#else
m_MP4fclose(this);
#endif
}
const char* MP4File::TempFileName()
{
// there are so many attempts in libc to get this right
// that for portablity reasons, it's best just to roll our own
#ifndef _WIN32
static char tempFileName[64];
u_int32_t i;
for (i = getpid(); i < 0xFFFFFFFF; i++) {
sprintf(tempFileName, "./tmp%u.mp4", i);
if (access(tempFileName, F_OK) != 0) {
break;
}
}
if (i == 0xFFFFFFFF) {
throw new MP4Error("can't create temporary file", "TempFileName");
}
#else
static char tempFileName[MAX_PATH + 3];
GetTempFileName(".", // dir. for temp. files
"mp4", // temp. filename prefix
0, // create unique name
tempFileName); // buffer for name
#endif
return tempFileName;
}
void MP4File::Rename(const char* oldFileName, const char* newFileName)
{
int rc;
#ifdef _WIN32
rc = remove(newFileName);
if (rc == 0) {
rc = rename(oldFileName, newFileName);
}
#else
rc = rename(oldFileName, newFileName);
#endif
if (rc != 0) {
throw new MP4Error(errno, "can't overwrite existing file", "Rename");
}
}
void MP4File::ProtectWriteOperation(char* where)
{
if (m_mode == 'r') {
throw new MP4Error("operation not permitted in read mode", where);
}
}
MP4Track* MP4File::GetTrack(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)];
}
MP4Atom* MP4File::FindAtom(const char* name)
{
MP4Atom* pAtom = NULL;
if (!name || !strcmp(name, "")) {
pAtom = m_pRootAtom;
} else {
pAtom = m_pRootAtom->FindAtom(name);
}
return pAtom;
}
MP4Atom* MP4File::AddChildAtom(
const char* parentName,
const char* childName)
{
return AddChildAtom(FindAtom(parentName), childName);
}
MP4Atom* MP4File::AddChildAtom(
MP4Atom* pParentAtom,
const char* childName)
{
return InsertChildAtom(pParentAtom, childName,
pParentAtom->GetNumberOfChildAtoms());
}
MP4Atom* MP4File::InsertChildAtom(
const char* parentName,
const char* childName,
u_int32_t index)
{
return InsertChildAtom(FindAtom(parentName), childName, index);
}
MP4Atom* MP4File::InsertChildAtom(
MP4Atom* pParentAtom,
const char* childName,
u_int32_t index)
{
MP4Atom* pChildAtom = MP4Atom::CreateAtom(childName);
ASSERT(pParentAtom);
pParentAtom->InsertChildAtom(pChildAtom, index);
pChildAtom->Generate();
return pChildAtom;
}
MP4Atom* MP4File::AddDescendantAtoms(
const char* ancestorName,
const char* descendantNames)
{
return AddDescendantAtoms(FindAtom(ancestorName), descendantNames);
}
MP4Atom* MP4File::AddDescendantAtoms(
MP4Atom* pAncestorAtom, const char* descendantNames)
{
ASSERT(pAncestorAtom);
MP4Atom* pParentAtom = pAncestorAtom;
MP4Atom* pChildAtom = NULL;
while (true) {
char* childName = MP4NameFirst(descendantNames);
if (childName == NULL) {
break;
}
descendantNames = MP4NameAfterFirst(descendantNames);
pChildAtom = pParentAtom->FindChildAtom(childName);
if (pChildAtom == NULL) {
pChildAtom = AddChildAtom(pParentAtom, childName);
}
pParentAtom = pChildAtom;
MP4Free(childName);
}
return pChildAtom;
}
bool MP4File::FindProperty(const char* name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (pIndex) {
*pIndex = 0; // set the default answer for index
}
return m_pRootAtom->FindProperty(name, ppProperty, pIndex);
}
void MP4File::FindIntegerProperty(const char* name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (!FindProperty(name, ppProperty, pIndex)) {
throw new MP4Error("no such property - %s", "MP4File::FindIntegerProperty", name);
}
switch ((*ppProperty)->GetType()) {
case Integer8Property:
case Integer16Property:
case Integer24Property:
case Integer32Property:
case Integer64Property:
break;
default:
throw new MP4Error("type mismatch - property %s type %d", "MP4File::FindIntegerProperty", name, (*ppProperty)->GetType());
}
}
u_int64_t MP4File::GetIntegerProperty(const char* name)
{
MP4Property* pProperty;
u_int32_t index;
FindIntegerProperty(name, &pProperty, &index);
return ((MP4IntegerProperty*)pProperty)->GetValue(index);
}
void MP4File::SetIntegerProperty(const char* name, u_int64_t value)
{
ProtectWriteOperation("SetIntegerProperty");
MP4Property* pProperty = NULL;
u_int32_t index = 0;
FindIntegerProperty(name, &pProperty, &index);
((MP4IntegerProperty*)pProperty)->SetValue(value, index);
}
void MP4File::FindFloatProperty(const char* name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (!FindProperty(name, ppProperty, pIndex)) {
throw new MP4Error("no such property - %s", "MP4File::FindFloatProperty", name);
}
if ((*ppProperty)->GetType() != Float32Property) {
throw new MP4Error("type mismatch - property %s type %d",
"MP4File::FindFloatProperty",
name,
(*ppProperty)->GetType());
}
}
float MP4File::GetFloatProperty(const char* name)
{
MP4Property* pProperty;
u_int32_t index;
FindFloatProperty(name, &pProperty, &index);
return ((MP4Float32Property*)pProperty)->GetValue(index);
}
void MP4File::SetFloatProperty(const char* name, float value)
{
ProtectWriteOperation("SetFloatProperty");
MP4Property* pProperty;
u_int32_t index;
FindFloatProperty(name, &pProperty, &index);
((MP4Float32Property*)pProperty)->SetValue(value, index);
}
void MP4File::FindStringProperty(const char* name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (!FindProperty(name, ppProperty, pIndex)) {
throw new MP4Error("no such property - %s", "MP4File::FindStringProperty", name);
}
if ((*ppProperty)->GetType() != StringProperty) {
throw new MP4Error("type mismatch - property %s type %d", "MP4File::FindStringProperty",
name, (*ppProperty)->GetType());
}
}
const char* MP4File::GetStringProperty(const char* name)
{
MP4Property* pProperty;
u_int32_t index;
FindStringProperty(name, &pProperty, &index);
return ((MP4StringProperty*)pProperty)->GetValue(index);
}
void MP4File::SetStringProperty(const char* name, const char* value)
{
ProtectWriteOperation("SetStringProperty");
MP4Property* pProperty;
u_int32_t index;
FindStringProperty(name, &pProperty, &index);
((MP4StringProperty*)pProperty)->SetValue(value, index);
}
void MP4File::FindBytesProperty(const char* name,
MP4Property** ppProperty, u_int32_t* pIndex)
{
if (!FindProperty(name, ppProperty, pIndex)) {
throw new MP4Error("no such property %s", "MP4File::FindBytesProperty", name);
}
if ((*ppProperty)->GetType() != BytesProperty) {
throw new MP4Error("type mismatch - property %s - type %d", "MP4File::FindBytesProperty", name, (*ppProperty)->GetType());
}
}
void MP4File::GetBytesProperty(const char* name,
u_int8_t** ppValue, u_int32_t* pValueSize)
{
MP4Property* pProperty;
u_int32_t index;
FindBytesProperty(name, &pProperty, &index);
((MP4BytesProperty*)pProperty)->GetValue(ppValue, pValueSize, index);
}
void MP4File::SetBytesProperty(const char* name,
const u_int8_t* pValue, u_int32_t valueSize)
{
ProtectWriteOperation("SetBytesProperty");
MP4Property* pProperty;
u_int32_t index;
FindBytesProperty(name, &pProperty, &index);
((MP4BytesProperty*)pProperty)->SetValue(pValue, valueSize, index);
}
// track functions
MP4TrackId MP4File::AddTrack(const char* type, u_int32_t timeScale)
{
ProtectWriteOperation("AddTrack");
// create and add new trak atom
MP4Atom* pTrakAtom = AddChildAtom("moov", "trak");
// allocate a new track id
MP4TrackId trackId = AllocTrackId();
m_trakIds.Add(trackId);
// set track id
MP4Integer32Property* pInteger32Property = NULL;
pTrakAtom->FindProperty(
"trak.tkhd.trackId", (MP4Property**)&pInteger32Property);
ASSERT(pInteger32Property);
pInteger32Property->SetValue(trackId);
// set track type
const char* normType = MP4Track::NormalizeTrackType(type);
// sanity check for user defined types
if (strlen(normType) > 4) {
VERBOSE_WARNING(m_verbosity,
printf("AddTrack: type truncated to four characters\n"));
// StringProperty::SetValue() will do the actual truncation
}
MP4StringProperty* pStringProperty = NULL;
pTrakAtom->FindProperty(
"trak.mdia.hdlr.handlerType", (MP4Property**)&pStringProperty);
ASSERT(pStringProperty);
pStringProperty->SetValue(normType);
// set track time scale
pInteger32Property = NULL;
pTrakAtom->FindProperty(
"trak.mdia.mdhd.timeScale", (MP4Property**)&pInteger32Property);
ASSERT(pInteger32Property);
pInteger32Property->SetValue(timeScale ? timeScale : 1000);
// now have enough to create MP4Track object
MP4Track* pTrack = NULL;
if (!strcmp(normType, MP4_HINT_TRACK_TYPE)) {
pTrack = new MP4RtpHintTrack(this, pTrakAtom);
} else {
pTrack = new MP4Track(this, pTrakAtom);
}
m_pTracks.Add(pTrack);
// mark non-hint tracks as enabled
if (strcmp(normType, MP4_HINT_TRACK_TYPE)) {
SetTrackIntegerProperty(trackId, "tkhd.flags", 1);
}
// mark track as contained in this file
// LATER will provide option for external data references
AddDataReference(trackId, NULL);
return trackId;
}
void MP4File::AddTrackToIod(MP4TrackId trackId)
{
MP4DescriptorProperty* pDescriptorProperty = NULL;
m_pRootAtom->FindProperty("moov.iods.esIds",
(MP4Property**)&pDescriptorProperty);
ASSERT(pDescriptorProperty);
MP4Descriptor* pDescriptor =
pDescriptorProperty->AddDescriptor(MP4ESIDIncDescrTag);
ASSERT(pDescriptor);
MP4Integer32Property* pIdProperty = NULL;
pDescriptor->FindProperty("id",
(MP4Property**)&pIdProperty);
ASSERT(pIdProperty);
pIdProperty->SetValue(trackId);
}
void MP4File::RemoveTrackFromIod(MP4TrackId trackId)
{
MP4DescriptorProperty* pDescriptorProperty = NULL;
m_pRootAtom->FindProperty("moov.iods.esIds",
(MP4Property**)&pDescriptorProperty);
ASSERT(pDescriptorProperty);
for (u_int32_t i = 0; i < pDescriptorProperty->GetCount(); i++) {
static char name[32];
snprintf(name, sizeof(name), "esIds[%u].id", i);
MP4Integer32Property* pIdProperty = NULL;
pDescriptorProperty->FindProperty(name,
(MP4Property**)&pIdProperty);
ASSERT(pIdProperty);
if (pIdProperty->GetValue() == trackId) {
pDescriptorProperty->DeleteDescriptor(i);
break;
}
}
}
void MP4File::AddTrackToOd(MP4TrackId trackId)
{
if (!m_odTrackId) {
return;
}
AddTrackReference(MakeTrackName(m_odTrackId, "tref.mpod"), trackId);
}
void MP4File::RemoveTrackFromOd(MP4TrackId trackId)
{
if (!m_odTrackId) {
return;
}
RemoveTrackReference(MakeTrackName(m_odTrackId, "tref.mpod"), trackId);
}
void MP4File::GetTrackReferenceProperties(const char* trefName,
MP4Property** ppCountProperty, MP4Property** ppTrackIdProperty)
{
char propName[1024];
snprintf(propName, sizeof(propName), "%s.%s", trefName, "entryCount");
m_pRootAtom->FindProperty(propName, ppCountProperty);
ASSERT(*ppCountProperty);
snprintf(propName, sizeof(propName), "%s.%s", trefName, "entries.trackId");
m_pRootAtom->FindProperty(propName, ppTrackIdProperty);
ASSERT(*ppTrackIdProperty);
}
void MP4File::AddTrackReference(const char* trefName, MP4TrackId refTrackId)
{
MP4Integer32Property* pCountProperty = NULL;
MP4Integer32Property* pTrackIdProperty = NULL;
GetTrackReferenceProperties(trefName,
(MP4Property**)&pCountProperty,
(MP4Property**)&pTrackIdProperty);
pTrackIdProperty->AddValue(refTrackId);
pCountProperty->IncrementValue();
}
u_int32_t MP4File::FindTrackReference(const char* trefName,
MP4TrackId refTrackId)
{
MP4Integer32Property* pCountProperty = NULL;
MP4Integer32Property* pTrackIdProperty = NULL;
GetTrackReferenceProperties(trefName,
(MP4Property**)&pCountProperty,
(MP4Property**)&pTrackIdProperty);
for (u_int32_t i = 0; i < pCountProperty->GetValue(); i++) {
if (refTrackId == pTrackIdProperty->GetValue(i)) {
return i + 1; // N.B. 1 not 0 based index
}
}
return 0;
}
void MP4File::RemoveTrackReference(const char* trefName, MP4TrackId refTrackId)
{
MP4Integer32Property* pCountProperty = NULL;
MP4Integer32Property* pTrackIdProperty = NULL;
GetTrackReferenceProperties(trefName,
(MP4Property**)&pCountProperty,
(MP4Property**)&pTrackIdProperty);
for (u_int32_t i = 0; i < pCountProperty->GetValue(); i++) {
if (refTrackId == pTrackIdProperty->GetValue(i)) {
pTrackIdProperty->DeleteValue(i);
pCountProperty->IncrementValue(-1);
}
}
}
void MP4File::AddDataReference(MP4TrackId trackId, const char* url)
{
MP4Atom* pDrefAtom =
FindAtom(MakeTrackName(trackId, "mdia.minf.dinf.dref"));
ASSERT(pDrefAtom);
MP4Integer32Property* pCountProperty = NULL;
pDrefAtom->FindProperty("dref.entryCount",
(MP4Property**)&pCountProperty);
ASSERT(pCountProperty);
pCountProperty->IncrementValue();
MP4Atom* pUrlAtom = AddChildAtom(pDrefAtom, "url ");
if (url && url[0] != '\0') {
pUrlAtom->SetFlags(pUrlAtom->GetFlags() & 0xFFFFFE);
MP4StringProperty* pUrlProperty = NULL;
pUrlAtom->FindProperty("url .location",
(MP4Property**)&pUrlProperty);
ASSERT(pUrlProperty);
pUrlProperty->SetValue(url);
} else {
pUrlAtom->SetFlags(pUrlAtom->GetFlags() | 1);
}
}
MP4TrackId MP4File::AddSystemsTrack(const char* type)
{
const char* normType = MP4Track::NormalizeTrackType(type);
// TBD if user type, fix name to four chars, and warn
MP4TrackId trackId = AddTrack(type, MP4_MSECS_TIME_SCALE);
InsertChildAtom(MakeTrackName(trackId, "mdia.minf"), "nmhd", 0);
AddChildAtom(MakeTrackName(trackId, "mdia.minf.stbl.stsd"), "mp4s");
// stsd is a unique beast in that it has a count of the number
// of child atoms that needs to be incremented after we add the mp4s atom
MP4Integer32Property* pStsdCountProperty;
FindIntegerProperty(
MakeTrackName(trackId, "mdia.minf.stbl.stsd.entryCount"),
(MP4Property**)&pStsdCountProperty);
pStsdCountProperty->IncrementValue();
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4s.esds.ESID", trackId);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4s.esds.decConfigDescr.objectTypeId",
MP4SystemsV1ObjectType);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4s.esds.decConfigDescr.streamType",
ConvertTrackTypeToStreamType(normType));
return trackId;
}
MP4TrackId MP4File::AddODTrack()
{
// until a demonstrated need emerges
// we limit ourselves to one object description track
if (m_odTrackId != MP4_INVALID_TRACK_ID) {
throw new MP4Error("object description track already exists",
"AddObjectDescriptionTrack");
}
m_odTrackId = AddSystemsTrack(MP4_OD_TRACK_TYPE);
AddTrackToIod(m_odTrackId);
AddDescendantAtoms(MakeTrackName(m_odTrackId, NULL), "tref.mpod");
return m_odTrackId;
}
MP4TrackId MP4File::AddSceneTrack()
{
MP4TrackId trackId = AddSystemsTrack(MP4_SCENE_TRACK_TYPE);
AddTrackToIod(trackId);
AddTrackToOd(trackId);
return trackId;
}
MP4TrackId MP4File::AddAudioTrack(
u_int32_t timeScale,
MP4Duration sampleDuration,
u_int8_t audioType)
{
MP4TrackId trackId = AddTrack(MP4_AUDIO_TRACK_TYPE, timeScale);
AddTrackToOd(trackId);
SetTrackFloatProperty(trackId, "tkhd.volume", 1.0);
InsertChildAtom(MakeTrackName(trackId, "mdia.minf"), "smhd", 0);
AddChildAtom(MakeTrackName(trackId, "mdia.minf.stbl.stsd"), "mp4a");
// stsd is a unique beast in that it has a count of the number
// of child atoms that needs to be incremented after we add the mp4a atom
MP4Integer32Property* pStsdCountProperty;
FindIntegerProperty(
MakeTrackName(trackId, "mdia.minf.stbl.stsd.entryCount"),
(MP4Property**)&pStsdCountProperty);
pStsdCountProperty->IncrementValue();
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4a.timeScale", timeScale);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4a.esds.ESID", trackId);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4a.esds.decConfigDescr.objectTypeId",
audioType);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4a.esds.decConfigDescr.streamType",
MP4AudioStreamType);
m_pTracks[FindTrackIndex(trackId)]->
SetFixedSampleDuration(sampleDuration);
return trackId;
}
MP4TrackId MP4File::AddVideoTrack(
u_int32_t timeScale,
MP4Duration sampleDuration,
u_int16_t width,
u_int16_t height,
u_int8_t videoType)
{
MP4TrackId trackId = AddTrack(MP4_VIDEO_TRACK_TYPE, timeScale);
AddTrackToOd(trackId);
SetTrackFloatProperty(trackId, "tkhd.width", width);
SetTrackFloatProperty(trackId, "tkhd.height", height);
InsertChildAtom(MakeTrackName(trackId, "mdia.minf"), "vmhd", 0);
AddChildAtom(MakeTrackName(trackId, "mdia.minf.stbl.stsd"), "mp4v");
// stsd is a unique beast in that it has a count of the number
// of child atoms that needs to be incremented after we add the mp4v atom
MP4Integer32Property* pStsdCountProperty;
FindIntegerProperty(
MakeTrackName(trackId, "mdia.minf.stbl.stsd.entryCount"),
(MP4Property**)&pStsdCountProperty);
pStsdCountProperty->IncrementValue();
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.width", width);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.height", height);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.esds.ESID", trackId);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.esds.decConfigDescr.objectTypeId",
videoType);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.esds.decConfigDescr.streamType",
MP4VisualStreamType);
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsz.sampleSize", sampleDuration);
m_pTracks[FindTrackIndex(trackId)]->
SetFixedSampleDuration(sampleDuration);
return trackId;
}
MP4TrackId MP4File::AddHintTrack(MP4TrackId refTrackId)
{
// validate reference track id
FindTrackIndex(refTrackId);
MP4TrackId trackId =
AddTrack(MP4_HINT_TRACK_TYPE, GetTrackTimeScale(refTrackId));
InsertChildAtom(MakeTrackName(trackId, "mdia.minf"), "hmhd", 0);
AddChildAtom(MakeTrackName(trackId, "mdia.minf.stbl.stsd"), "rtp ");
// stsd is a unique beast in that it has a count of the number
// of child atoms that needs to be incremented after we add the rtp atom
MP4Integer32Property* pStsdCountProperty;
FindIntegerProperty(
MakeTrackName(trackId, "mdia.minf.stbl.stsd.entryCount"),
(MP4Property**)&pStsdCountProperty);
pStsdCountProperty->IncrementValue();
SetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.rtp .tims.timeScale",
GetTrackTimeScale(trackId));
AddDescendantAtoms(MakeTrackName(trackId, NULL), "tref.hint");
AddTrackReference(MakeTrackName(trackId, "tref.hint"), refTrackId);
AddDescendantAtoms(MakeTrackName(trackId, NULL), "udta.hnti.sdp ");
AddDescendantAtoms(MakeTrackName(trackId, NULL), "udta.hinf");
return trackId;
}
void MP4File::DeleteTrack(MP4TrackId trackId)
{
ProtectWriteOperation("MP4DeleteTrack");
u_int32_t trakIndex = FindTrakAtomIndex(trackId);
u_int16_t trackIndex = FindTrackIndex(trackId);
MP4Track* pTrack = m_pTracks[trackIndex];
MP4Atom* pTrakAtom = pTrack->GetTrakAtom();
ASSERT(pTrakAtom);
MP4Atom* pMoovAtom = FindAtom("moov");
ASSERT(pMoovAtom);
RemoveTrackFromIod(trackId);
RemoveTrackFromOd(trackId);
if (trackId == m_odTrackId) {
m_odTrackId = 0;
}
pMoovAtom->DeleteChildAtom(pTrakAtom);
m_trakIds.Delete(trakIndex);
m_pTracks.Delete(trackIndex);
delete pTrack;
delete pTrakAtom;
}
u_int32_t MP4File::GetNumberOfTracks(const char* type, u_int8_t subType)
{
if (type == NULL) {
return m_pTracks.Size();
}
u_int32_t typeSeen = 0;
const char* normType = MP4Track::NormalizeTrackType(type);
for (u_int32_t i = 0; i < m_pTracks.Size(); i++) {
if (!strcmp(normType, m_pTracks[i]->GetType())) {
if (subType) {
if (normType == MP4_AUDIO_TRACK_TYPE) {
if (subType != GetTrackAudioType(m_pTracks[i]->GetId())) {
continue;
}
} else if (normType == MP4_VIDEO_TRACK_TYPE) {
if (subType != GetTrackVideoType(m_pTracks[i]->GetId())) {
continue;
}
}
// else unknown subtype, ignore it
}
typeSeen++;
}
}
return typeSeen;
}
MP4TrackId MP4File::AllocTrackId()
{
MP4TrackId trackId =
GetIntegerProperty("moov.mvhd.nextTrackId");
if (trackId <= 0xFFFF) {
// check that nextTrackid is correct
try {
FindTrackIndex(trackId);
// ERROR, this trackId is in use
}
catch (MP4Error* e) {
// OK, this trackId is not in use, proceed
delete e;
SetIntegerProperty("moov.mvhd.nextTrackId", trackId + 1);
return trackId;
}
}
// we need to search for a track id
for (trackId = 1; trackId <= 0xFFFF; trackId++) {
try {
FindTrackIndex(trackId);
// KEEP LOOKING, this trackId is in use
}
catch (MP4Error* e) {
// OK, this trackId is not in use, proceed
delete e;
return trackId;
}
}
// extreme case where mp4 file has 2^16 tracks in it
throw new MP4Error("too many existing tracks", "AddTrack");
return MP4_INVALID_TRACK_ID; // to keep MSVC happy
}
MP4TrackId MP4File::FindTrackId(
u_int16_t trackIndex, const char* type, u_int8_t subType)
{
if (type == NULL) {
return m_pTracks[trackIndex]->GetId();
}
u_int32_t typeSeen = 0;
const char* normType = MP4Track::NormalizeTrackType(type);
for (u_int32_t i = 0; i < m_pTracks.Size(); i++) {
if (!strcmp(normType, m_pTracks[i]->GetType())) {
if (subType) {
if (normType == MP4_AUDIO_TRACK_TYPE) {
if (subType != GetTrackAudioType(m_pTracks[i]->GetId())) {
continue;
}
} else if (normType == MP4_VIDEO_TRACK_TYPE) {
if (subType != GetTrackVideoType(m_pTracks[i]->GetId())) {
continue;
}
}
// else unknown subtype, ignore it
}
if (trackIndex == typeSeen) {
return m_pTracks[i]->GetId();
}
typeSeen++;
}
}
throw new MP4Error("Track index doesn't exist - track %d type %s",
"FindTrackId",
trackIndex, type);
return MP4_INVALID_TRACK_ID; // satisfy MS compiler
}
u_int16_t MP4File::FindTrackIndex(MP4TrackId trackId)
{
for (u_int32_t i = 0; i < m_pTracks.Size() && i <= 0xFFFF; i++) {
if (m_pTracks[i]->GetId() == trackId) {
return (u_int16_t)i;
}
}
throw new MP4Error("Track id %d doesn't exist", "FindTrackIndex", trackId);
return (u_int16_t)-1; // satisfy MS compiler
}
u_int16_t MP4File::FindTrakAtomIndex(MP4TrackId trackId)
{
if (trackId) {
for (u_int32_t i = 0; i < m_trakIds.Size(); i++) {
if (m_trakIds[i] == trackId) {
return i;
}
}
}
throw new MP4Error("Track id %d doesn't exist", "FindTrakAtomIndex",
trackId);
return (u_int16_t)-1; // satisfy MS compiler
}
u_int32_t MP4File::GetSampleSize(MP4TrackId trackId, MP4SampleId sampleId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetSampleSize(sampleId);
}
u_int32_t MP4File::GetTrackMaxSampleSize(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetMaxSampleSize();
}
MP4SampleId MP4File::GetSampleIdFromTime(MP4TrackId trackId,
MP4Timestamp when, bool wantSyncSample)
{
return m_pTracks[FindTrackIndex(trackId)]->
GetSampleIdFromTime(when, wantSyncSample);
}
MP4Timestamp MP4File::GetSampleTime(
MP4TrackId trackId, MP4SampleId sampleId)
{
MP4Timestamp timestamp;
m_pTracks[FindTrackIndex(trackId)]->
GetSampleTimes(sampleId, ×tamp, NULL);
return timestamp;
}
MP4Duration MP4File::GetSampleDuration(
MP4TrackId trackId, MP4SampleId sampleId)
{
MP4Duration duration;
m_pTracks[FindTrackIndex(trackId)]->
GetSampleTimes(sampleId, NULL, &duration);
return duration;
}
MP4Duration MP4File::GetSampleRenderingOffset(
MP4TrackId trackId, MP4SampleId sampleId)
{
return m_pTracks[FindTrackIndex(trackId)]->
GetSampleRenderingOffset(sampleId);
}
bool MP4File::GetSampleSync(MP4TrackId trackId, MP4SampleId sampleId)
{
return m_pTracks[FindTrackIndex(trackId)]->IsSyncSample(sampleId);
}
void MP4File::ReadSample(MP4TrackId trackId, MP4SampleId sampleId,
u_int8_t** ppBytes, u_int32_t* pNumBytes,
MP4Timestamp* pStartTime, MP4Duration* pDuration,
MP4Duration* pRenderingOffset, bool* pIsSyncSample)
{
m_pTracks[FindTrackIndex(trackId)]->
ReadSample(sampleId, ppBytes, pNumBytes,
pStartTime, pDuration, pRenderingOffset, pIsSyncSample);
}
void MP4File::WriteSample(MP4TrackId trackId,
u_int8_t* pBytes, u_int32_t numBytes,
MP4Duration duration, MP4Duration renderingOffset, bool isSyncSample)
{
ProtectWriteOperation("MP4WriteSample");
m_pTracks[FindTrackIndex(trackId)]->
WriteSample(pBytes, numBytes, duration, renderingOffset, isSyncSample);
m_pModificationProperty->SetValue(MP4GetAbsTimestamp());
}
void MP4File::SetSampleRenderingOffset(MP4TrackId trackId,
MP4SampleId sampleId, MP4Duration renderingOffset)
{
ProtectWriteOperation("MP4SetSampleRenderingOffset");
m_pTracks[FindTrackIndex(trackId)]->
SetSampleRenderingOffset(sampleId, renderingOffset);
m_pModificationProperty->SetValue(MP4GetAbsTimestamp());
}
char* MP4File::MakeTrackName(MP4TrackId trackId, const char* name)
{
u_int16_t trakIndex = FindTrakAtomIndex(trackId);
static char trakName[1024];
if (name == NULL || name[0] == '\0') {
snprintf(trakName, sizeof(trakName),
"moov.trak[%u]", trakIndex);
} else {
snprintf(trakName, sizeof(trakName),
"moov.trak[%u].%s", trakIndex, name);
}
return trakName;
}
u_int64_t MP4File::GetTrackIntegerProperty(MP4TrackId trackId, const char* name)
{
return GetIntegerProperty(MakeTrackName(trackId, name));
}
void MP4File::SetTrackIntegerProperty(MP4TrackId trackId, const char* name,
int64_t value)
{
SetIntegerProperty(MakeTrackName(trackId, name), value);
}
float MP4File::GetTrackFloatProperty(MP4TrackId trackId, const char* name)
{
return GetFloatProperty(MakeTrackName(trackId, name));
}
void MP4File::SetTrackFloatProperty(MP4TrackId trackId, const char* name,
float value)
{
SetFloatProperty(MakeTrackName(trackId, name), value);
}
const char* MP4File::GetTrackStringProperty(MP4TrackId trackId, const char* name)
{
return GetStringProperty(MakeTrackName(trackId, name));
}
void MP4File::SetTrackStringProperty(MP4TrackId trackId, const char* name,
const char* value)
{
SetStringProperty(MakeTrackName(trackId, name), value);
}
void MP4File::GetTrackBytesProperty(MP4TrackId trackId, const char* name,
u_int8_t** ppValue, u_int32_t* pValueSize)
{
GetBytesProperty(MakeTrackName(trackId, name), ppValue, pValueSize);
}
void MP4File::SetTrackBytesProperty(MP4TrackId trackId, const char* name,
const u_int8_t* pValue, u_int32_t valueSize)
{
SetBytesProperty(MakeTrackName(trackId, name), pValue, valueSize);
}
// file level convenience functions
MP4Duration MP4File::GetDuration()
{
return m_pDurationProperty->GetValue();
}
void MP4File::SetDuration(MP4Duration value)
{
m_pDurationProperty->SetValue(value);
}
u_int32_t MP4File::GetTimeScale()
{
return m_pTimeScaleProperty->GetValue();
}
void MP4File::SetTimeScale(u_int32_t value)
{
if (value == 0) {
throw new MP4Error("invalid value", "SetTimeScale");
}
m_pTimeScaleProperty->SetValue(value);
}
u_int8_t MP4File::GetODProfileLevel()
{
return GetIntegerProperty("moov.iods.ODProfileLevelId");
}
void MP4File::SetODProfileLevel(u_int8_t value)
{
SetIntegerProperty("moov.iods.ODProfileLevelId", value);
}
u_int8_t MP4File::GetSceneProfileLevel()
{
return GetIntegerProperty("moov.iods.sceneProfileLevelId");
}
void MP4File::SetSceneProfileLevel(u_int8_t value)
{
SetIntegerProperty("moov.iods.sceneProfileLevelId", value);
}
u_int8_t MP4File::GetVideoProfileLevel()
{
return GetIntegerProperty("moov.iods.visualProfileLevelId");
}
void MP4File::SetVideoProfileLevel(u_int8_t value)
{
SetIntegerProperty("moov.iods.visualProfileLevelId", value);
}
u_int8_t MP4File::GetAudioProfileLevel()
{
return GetIntegerProperty("moov.iods.audioProfileLevelId");
}
void MP4File::SetAudioProfileLevel(u_int8_t value)
{
SetIntegerProperty("moov.iods.audioProfileLevelId", value);
}
u_int8_t MP4File::GetGraphicsProfileLevel()
{
return GetIntegerProperty("moov.iods.graphicsProfileLevelId");
}
void MP4File::SetGraphicsProfileLevel(u_int8_t value)
{
SetIntegerProperty("moov.iods.graphicsProfileLevelId", value);
}
const char* MP4File::GetSessionSdp()
{
return GetStringProperty("moov.udta.hnti.rtp .sdpText");
}
void MP4File::SetSessionSdp(const char* sdpString)
{
AddDescendantAtoms("moov", "udta.hnti.rtp ");
SetStringProperty("moov.udta.hnti.rtp .sdpText", sdpString);
}
void MP4File::AppendSessionSdp(const char* sdpFragment)
{
const char* oldSdpString = NULL;
try {
oldSdpString = GetSessionSdp();
}
catch (MP4Error* e) {
delete e;
SetSessionSdp(sdpFragment);
return;
}
char* newSdpString =
(char*)MP4Malloc(strlen(oldSdpString) + strlen(sdpFragment) + 1);
strcpy(newSdpString, oldSdpString);
strcat(newSdpString, sdpFragment);
SetSessionSdp(newSdpString);
MP4Free(newSdpString);
}
// track level convenience functions
MP4SampleId MP4File::GetTrackNumberOfSamples(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetNumberOfSamples();
}
const char* MP4File::GetTrackType(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetType();
}
u_int32_t MP4File::GetTrackTimeScale(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetTimeScale();
}
void MP4File::SetTrackTimeScale(MP4TrackId trackId, u_int32_t value)
{
if (value == 0) {
throw new MP4Error("invalid value", "SetTrackTimeScale");
}
SetTrackIntegerProperty(trackId, "mdia.mdhd.timeScale", value);
}
MP4Duration MP4File::GetTrackDuration(MP4TrackId trackId)
{
return GetTrackIntegerProperty(trackId, "mdia.mdhd.duration");
}
u_int8_t MP4File::GetTrackAudioType(MP4TrackId trackId)
{
return GetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4a.esds.decConfigDescr.objectTypeId");
}
u_int8_t MP4File::GetTrackAudioMpeg4Type(MP4TrackId trackId)
{
// verify that track is an MPEG-4 audio track
if (GetTrackAudioType(trackId) != MP4_MPEG4_AUDIO_TYPE) {
return MP4_MPEG4_INVALID_AUDIO_TYPE;
}
u_int8_t* pEsConfig = NULL;
u_int32_t esConfigSize;
// The Mpeg4 audio type (AAC, CELP, HXVC, ...)
// is the first 5 bits of the ES configuration
GetTrackESConfiguration(trackId, &pEsConfig, &esConfigSize);
if (esConfigSize < 1) {
return MP4_MPEG4_INVALID_AUDIO_TYPE;
}
u_int8_t mpeg4Type = (pEsConfig[0] >> 3);
free(pEsConfig);
return mpeg4Type;
}
u_int8_t MP4File::GetTrackVideoType(MP4TrackId trackId)
{
return GetTrackIntegerProperty(trackId,
"mdia.minf.stbl.stsd.mp4v.esds.decConfigDescr.objectTypeId");
}
MP4Duration MP4File::GetTrackFixedSampleDuration(MP4TrackId trackId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetFixedSampleDuration();
}
float MP4File::GetTrackVideoFrameRate(MP4TrackId trackId)
{
MP4SampleId numSamples =
GetTrackNumberOfSamples(trackId);
#ifdef _WIN32
int64_t
#else
u_int64_t
#endif
msDuration =
ConvertFromTrackDuration(trackId,
GetTrackDuration(trackId), MP4_MSECS_TIME_SCALE);
if (msDuration == 0) {
return 0.0;
}
return ((double)numSamples / (double)msDuration) * MP4_MSECS_TIME_SCALE;
}
void MP4File::GetTrackESConfiguration(MP4TrackId trackId,
u_int8_t** ppConfig, u_int32_t* pConfigSize)
{
GetTrackBytesProperty(trackId,
"mdia.minf.stbl.stsd.*[0].esds.decConfigDescr.decSpecificInfo[0].info",
ppConfig, pConfigSize);
}
void MP4File::SetTrackESConfiguration(MP4TrackId trackId,
const u_int8_t* pConfig, u_int32_t configSize)
{
// get a handle on the track decoder config descriptor
MP4DescriptorProperty* pConfigDescrProperty = NULL;
FindProperty(MakeTrackName(trackId,
"mdia.minf.stbl.stsd.*[0].esds.decConfigDescr.decSpecificInfo"),
(MP4Property**)&pConfigDescrProperty);
if (pConfigDescrProperty == NULL) {
// probably trackId refers to a hint track
throw new MP4Error("no such property", "MP4SetTrackESConfiguration");
}
// lookup the property to store the configuration
MP4BytesProperty* pInfoProperty = NULL;
pConfigDescrProperty->FindProperty("decSpecificInfo[0].info",
(MP4Property**)&pInfoProperty);
// configuration being set for the first time
if (pInfoProperty == NULL) {
// need to create a new descriptor to hold it
MP4Descriptor* pConfigDescr =
pConfigDescrProperty->AddDescriptor(MP4DecSpecificDescrTag);
pConfigDescr->Generate();
pConfigDescrProperty->FindProperty(
"decSpecificInfo[0].info",
(MP4Property**)&pInfoProperty);
ASSERT(pInfoProperty);
}
// set the value
pInfoProperty->SetValue(pConfig, configSize);
}
const char* MP4File::GetHintTrackSdp(MP4TrackId hintTrackId)
{
return GetTrackStringProperty(hintTrackId, "udta.hnti.sdp .sdpText");
}
void MP4File::SetHintTrackSdp(MP4TrackId hintTrackId, const char* sdpString)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4SetHintTrackSdp");
}
AddDescendantAtoms(
MakeTrackName(hintTrackId, NULL), "udta.hnti.sdp ");
SetTrackStringProperty(hintTrackId, "udta.hnti.sdp .sdpText", sdpString);
}
void MP4File::AppendHintTrackSdp(MP4TrackId hintTrackId,
const char* sdpFragment)
{
const char* oldSdpString = NULL;
try {
oldSdpString = GetHintTrackSdp(hintTrackId);
}
catch (MP4Error* e) {
delete e;
SetHintTrackSdp(hintTrackId, sdpFragment);
return;
}
char* newSdpString =
(char*)MP4Malloc(strlen(oldSdpString) + strlen(sdpFragment) + 1);
strcpy(newSdpString, oldSdpString);
strcat(newSdpString, sdpFragment);
SetHintTrackSdp(hintTrackId, newSdpString);
MP4Free(newSdpString);
}
void MP4File::GetHintTrackRtpPayload(
MP4TrackId hintTrackId,
char** ppPayloadName,
u_int8_t* pPayloadNumber,
u_int16_t* pMaxPayloadSize,
char **ppEncodingParams)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetHintTrackRtpPayload");
}
((MP4RtpHintTrack*)pTrack)->GetPayload(
ppPayloadName, pPayloadNumber, pMaxPayloadSize, ppEncodingParams);
}
void MP4File::SetHintTrackRtpPayload(MP4TrackId hintTrackId,
const char* payloadName, u_int8_t* pPayloadNumber, u_int16_t maxPayloadSize,
const char *encoding_params)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4SetHintTrackRtpPayload");
}
u_int8_t payloadNumber;
if (pPayloadNumber && *pPayloadNumber != MP4_SET_DYNAMIC_PAYLOAD) {
payloadNumber = *pPayloadNumber;
} else {
payloadNumber = AllocRtpPayloadNumber();
if (pPayloadNumber) {
*pPayloadNumber = payloadNumber;
}
}
((MP4RtpHintTrack*)pTrack)->SetPayload(
payloadName, payloadNumber, maxPayloadSize, encoding_params);
}
u_int8_t MP4File::AllocRtpPayloadNumber()
{
MP4Integer32Array usedPayloads;
u_int32_t i;
// collect rtp payload numbers in use by existing tracks
for (i = 0; i < m_pTracks.Size(); i++) {
MP4Atom* pTrakAtom = m_pTracks[i]->GetTrakAtom();
MP4Integer32Property* pPayloadProperty = NULL;
pTrakAtom->FindProperty("trak.udta.hinf.payt.payloadNumber",
(MP4Property**)&pPayloadProperty);
if (pPayloadProperty) {
usedPayloads.Add(pPayloadProperty->GetValue());
}
}
// search dynamic payload range for an available slot
u_int8_t payload;
for (payload = 96; payload < 128; payload++) {
for (i = 0; i < usedPayloads.Size(); i++) {
if (payload == usedPayloads[i]) {
break;
}
}
if (i == usedPayloads.Size()) {
break;
}
}
if (payload >= 128) {
throw new MP4Error("no more available rtp payload numbers",
"AllocRtpPayloadNumber");
}
return payload;
}
MP4TrackId MP4File::GetHintTrackReferenceTrackId(
MP4TrackId hintTrackId)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetHintTrackReferenceTrackId");
}
MP4Track* pRefTrack = ((MP4RtpHintTrack*)pTrack)->GetRefTrack();
if (pRefTrack == NULL) {
return MP4_INVALID_TRACK_ID;
}
return pRefTrack->GetId();
}
void MP4File::ReadRtpHint(
MP4TrackId hintTrackId,
MP4SampleId hintSampleId,
u_int16_t* pNumPackets)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track", "MP4ReadRtpHint");
}
((MP4RtpHintTrack*)pTrack)->
ReadHint(hintSampleId, pNumPackets);
}
u_int16_t MP4File::GetRtpHintNumberOfPackets(
MP4TrackId hintTrackId)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetRtpHintNumberOfPackets");
}
return ((MP4RtpHintTrack*)pTrack)->GetHintNumberOfPackets();
}
int8_t MP4File::GetRtpPacketBFrame(
MP4TrackId hintTrackId,
u_int16_t packetIndex)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetRtpHintBFrame");
}
return ((MP4RtpHintTrack*)pTrack)->GetPacketBFrame(packetIndex);
}
int32_t MP4File::GetRtpPacketTransmitOffset(
MP4TrackId hintTrackId,
u_int16_t packetIndex)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetRtpPacketTransmitOffset");
}
return ((MP4RtpHintTrack*)pTrack)->GetPacketTransmitOffset(packetIndex);
}
void MP4File::ReadRtpPacket(
MP4TrackId hintTrackId,
u_int16_t packetIndex,
u_int8_t** ppBytes,
u_int32_t* pNumBytes,
u_int32_t ssrc,
bool includeHeader,
bool includePayload)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track", "MP4ReadPacket");
}
((MP4RtpHintTrack*)pTrack)->ReadPacket(
packetIndex, ppBytes, pNumBytes,
ssrc, includeHeader, includePayload);
}
MP4Timestamp MP4File::GetRtpTimestampStart(
MP4TrackId hintTrackId)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4GetRtpTimestampStart");
}
return ((MP4RtpHintTrack*)pTrack)->GetRtpTimestampStart();
}
void MP4File::SetRtpTimestampStart(
MP4TrackId hintTrackId,
MP4Timestamp rtpStart)
{
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4SetRtpTimestampStart");
}
((MP4RtpHintTrack*)pTrack)->SetRtpTimestampStart(rtpStart);
}
void MP4File::AddRtpHint(MP4TrackId hintTrackId,
bool isBframe, u_int32_t timestampOffset)
{
ProtectWriteOperation("MP4AddRtpHint");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track", "MP4AddRtpHint");
}
((MP4RtpHintTrack*)pTrack)->AddHint(isBframe, timestampOffset);
}
void MP4File::AddRtpPacket(
MP4TrackId hintTrackId, bool setMbit, int32_t transmitOffset)
{
ProtectWriteOperation("MP4AddRtpPacket");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track", "MP4AddRtpPacket");
}
((MP4RtpHintTrack*)pTrack)->AddPacket(setMbit, transmitOffset);
}
void MP4File::AddRtpImmediateData(MP4TrackId hintTrackId,
const u_int8_t* pBytes, u_int32_t numBytes)
{
ProtectWriteOperation("MP4AddRtpImmediateData");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4AddRtpImmediateData");
}
((MP4RtpHintTrack*)pTrack)->AddImmediateData(pBytes, numBytes);
}
void MP4File::AddRtpSampleData(MP4TrackId hintTrackId,
MP4SampleId sampleId, u_int32_t dataOffset, u_int32_t dataLength)
{
ProtectWriteOperation("MP4AddRtpSampleData");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4AddRtpSampleData");
}
((MP4RtpHintTrack*)pTrack)->AddSampleData(
sampleId, dataOffset, dataLength);
}
void MP4File::AddRtpESConfigurationPacket(MP4TrackId hintTrackId)
{
ProtectWriteOperation("MP4AddRtpESConfigurationPacket");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4AddRtpESConfigurationPacket");
}
((MP4RtpHintTrack*)pTrack)->AddESConfigurationPacket();
}
void MP4File::WriteRtpHint(MP4TrackId hintTrackId,
MP4Duration duration, bool isSyncSample)
{
ProtectWriteOperation("MP4WriteRtpHint");
MP4Track* pTrack = m_pTracks[FindTrackIndex(hintTrackId)];
if (strcmp(pTrack->GetType(), MP4_HINT_TRACK_TYPE)) {
throw new MP4Error("track is not a hint track",
"MP4WriteRtpHint");
}
((MP4RtpHintTrack*)pTrack)->WriteHint(duration, isSyncSample);
}
u_int64_t MP4File::ConvertFromMovieDuration(
MP4Duration duration,
u_int32_t timeScale)
{
return MP4ConvertTime((u_int64_t)duration,
GetTimeScale(), timeScale);
}
u_int64_t MP4File::ConvertFromTrackTimestamp(
MP4TrackId trackId,
MP4Timestamp timeStamp,
u_int32_t timeScale)
{
return MP4ConvertTime((u_int64_t)timeStamp,
GetTrackTimeScale(trackId), timeScale);
}
MP4Timestamp MP4File::ConvertToTrackTimestamp(
MP4TrackId trackId,
u_int64_t timeStamp,
u_int32_t timeScale)
{
return (MP4Timestamp)MP4ConvertTime(timeStamp,
timeScale, GetTrackTimeScale(trackId));
}
u_int64_t MP4File::ConvertFromTrackDuration(
MP4TrackId trackId,
MP4Duration duration,
u_int32_t timeScale)
{
return MP4ConvertTime((u_int64_t)duration,
GetTrackTimeScale(trackId), timeScale);
}
MP4Duration MP4File::ConvertToTrackDuration(
MP4TrackId trackId,
u_int64_t duration,
u_int32_t timeScale)
{
return (MP4Duration)MP4ConvertTime(duration,
timeScale, GetTrackTimeScale(trackId));
}
u_int8_t MP4File::ConvertTrackTypeToStreamType(const char* trackType)
{
u_int8_t streamType;
if (!strcmp(trackType, MP4_OD_TRACK_TYPE)) {
streamType = MP4ObjectDescriptionStreamType;
} else if (!strcmp(trackType, MP4_SCENE_TRACK_TYPE)) {
streamType = MP4SceneDescriptionStreamType;
} else if (!strcmp(trackType, MP4_CLOCK_TRACK_TYPE)) {
streamType = MP4ClockReferenceStreamType;
} else if (!strcmp(trackType, MP4_MPEG7_TRACK_TYPE)) {
streamType = MP4Mpeg7StreamType;
} else if (!strcmp(trackType, MP4_OCI_TRACK_TYPE)) {
streamType = MP4OCIStreamType;
} else if (!strcmp(trackType, MP4_IPMP_TRACK_TYPE)) {
streamType = MP4IPMPStreamType;
} else if (!strcmp(trackType, MP4_MPEGJ_TRACK_TYPE)) {
streamType = MP4MPEGJStreamType;
} else {
streamType = MP4UserPrivateStreamType;
}
return streamType;
}
// edit list
char* MP4File::MakeTrackEditName(
MP4TrackId trackId,
MP4EditId editId,
const char* name)
{
char* trakName = MakeTrackName(trackId, NULL);
static char editName[1024];
snprintf(editName, sizeof(editName),
"%s.edts.elst.entries[%u].%s",
trakName, editId - 1, name);
return editName;
}
MP4EditId MP4File::AddTrackEdit(
MP4TrackId trackId,
MP4EditId editId)
{
ProtectWriteOperation("AddTrackEdit");
return m_pTracks[FindTrackIndex(trackId)]->AddEdit(editId);
}
void MP4File::DeleteTrackEdit(
MP4TrackId trackId,
MP4EditId editId)
{
ProtectWriteOperation("DeleteTrackEdit");
m_pTracks[FindTrackIndex(trackId)]->DeleteEdit(editId);
}
u_int32_t MP4File::GetTrackNumberOfEdits(
MP4TrackId trackId)
{
return GetTrackIntegerProperty(trackId, "edts.elst.entryCount");
}
MP4Duration MP4File::GetTrackEditTotalDuration(
MP4TrackId trackId,
MP4EditId editId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetEditTotalDuration(editId);
}
MP4Timestamp MP4File::GetTrackEditStart(
MP4TrackId trackId,
MP4EditId editId)
{
return m_pTracks[FindTrackIndex(trackId)]->GetEditStart(editId);
}
MP4Timestamp MP4File::GetTrackEditMediaStart(
MP4TrackId trackId,
MP4EditId editId)
{
return GetIntegerProperty(
MakeTrackEditName(trackId, editId, "mediaTime"));
}
void MP4File::SetTrackEditMediaStart(
MP4TrackId trackId,
MP4EditId editId,
MP4Timestamp startTime)
{
SetIntegerProperty(
MakeTrackEditName(trackId, editId, "mediaTime"),
startTime);
}
MP4Duration MP4File::GetTrackEditDuration(
MP4TrackId trackId,
MP4EditId editId)
{
return GetIntegerProperty(
MakeTrackEditName(trackId, editId, "segmentDuration"));
}
void MP4File::SetTrackEditDuration(
MP4TrackId trackId,
MP4EditId editId,
MP4Duration duration)
{
SetIntegerProperty(
MakeTrackEditName(trackId, editId, "segmentDuration"),
duration);
}
bool MP4File::GetTrackEditDwell(
MP4TrackId trackId,
MP4EditId editId)
{
return (GetIntegerProperty(
MakeTrackEditName(trackId, editId, "mediaRate")) == 0);
}
void MP4File::SetTrackEditDwell(
MP4TrackId trackId,
MP4EditId editId,
bool dwell)
{
SetIntegerProperty(
MakeTrackEditName(trackId, editId, "mediaRate"),
(dwell ? 0 : 1));
}
MP4SampleId MP4File::GetSampleIdFromEditTime(
MP4TrackId trackId,
MP4Timestamp when,
MP4Timestamp* pStartTime,
MP4Duration* pDuration)
{
return m_pTracks[FindTrackIndex(trackId)]->GetSampleIdFromEditTime(
when, pStartTime, pDuration);
}
/* Code for handling mp4 tagging */
void MP4File::TagCreate(MP4TrackId trackId)
{
if (trackId == NULL)
AddDescendantAtoms("moov", "udta.TAG4");
else
AddDescendantAtoms(MakeTrackName(trackId, NULL), "udta.TAG4");
}
bool MP4File::TagDelete(MP4TrackId trackId)
{
MP4Atom *pUdtaAtom = NULL;
MP4Atom *pTagAtom = NULL;
if (trackId == NULL)
{
pUdtaAtom = m_pRootAtom->FindAtom("moov.udta");
pTagAtom = m_pRootAtom->FindAtom("moov.udta.TAG4");
} else {
pUdtaAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta"));
pTagAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta.TAG4"));
}
/* there is no tag */
if (!pUdtaAtom || !pTagAtom)
return false;
pUdtaAtom->DeleteChildAtom(pTagAtom);
delete pTagAtom;
return true;
}
bool MP4File::TagAddEntry(MP4TrackId trackId,
const char *name, const char *value)
{
MP4StringProperty *pNameProperty = NULL;
MP4StringProperty *pValueProperty = NULL;
MP4Integer32Property *pCountProperty = NULL;
MP4Atom *pTagAtom = NULL;
if (trackId == NULL)
pTagAtom = m_pRootAtom->FindAtom("moov.udta.TAG4");
else
pTagAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta.TAG4"));
if (!pTagAtom)
{
TagCreate(trackId);
if (trackId == NULL)
pTagAtom = m_pRootAtom->FindAtom("moov.udta.TAG4");
else
pTagAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta.TAG4"));
}
pTagAtom->FindProperty("TAG4.entryCount",
(MP4Property**)&pCountProperty);
ASSERT(pCountProperty);
pTagAtom->FindProperty("TAG4.entries.name",
(MP4Property**)&pNameProperty);
ASSERT(pNameProperty);
{
char name2[128];
if (strlen(name) > 126)
{
memcpy(name2, name, 127);
name2[127] = '\0';
pNameProperty->AddValue((char*)name2);
} else {
pNameProperty->AddValue((char*)name);
}
}
pTagAtom->FindProperty("TAG4.entries.value",
(MP4Property**)&pValueProperty);
ASSERT(pValueProperty);
{
char value2[128];
if (strlen(value) > 126)
{
memcpy(value2, value, 127);
value2[127] = '\0';
pValueProperty->AddValue((char*)value2);
} else {
pValueProperty->AddValue((char*)value);
}
}
pCountProperty->IncrementValue();
return true;
}
#if 0 // not working
void MP4File::TagDeleteEntry(MP4TrackId trackId, u_int32_t index)
{
MP4TableProperty *pEntryProperty = NULL;
MP4Integer32Property *pCountProperty = NULL;
MP4Atom *pTagAtom = NULL;
if (trackId == NULL)
pTagAtom = m_pRootAtom->FindAtom("moov.udta.TAG4");
else
pTagAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta.TAG4"));
pTagAtom->FindProperty("TAG4.entryCount",
(MP4Property**)&pCountProperty);
ASSERT(pCountProperty);
pTagAtom->FindProperty("TAG4.entries",
(MP4Property**)&pEntryProperty);
ASSERT(pEntryProperty);
pEntryProperty->DeleteEntry(index);
pCountProperty->IncrementValue(-1);
}
#endif
u_int32_t MP4File::TagGetNumEntries(MP4TrackId trackId)
{
MP4Integer32Property *pCountProperty = NULL;
MP4Atom *pTagAtom = NULL;
if (trackId == NULL)
pTagAtom = m_pRootAtom->FindAtom("moov.udta.TAG4");
else
pTagAtom = m_pRootAtom->FindAtom(MakeTrackName(trackId, "udta.TAG4"));
if (pTagAtom)
{
pTagAtom->FindProperty("TAG4.entryCount",
(MP4Property**)&pCountProperty);
if (pCountProperty)
{
return pCountProperty->GetValue();
}
}
return 0;
}
void MP4File::TagGetEntry(MP4TrackId trackId, u_int32_t index,
const char **name, const char **value)
{
char s[256];
if (trackId == NULL)
{
sprintf(s, "moov.udta.TAG4.entries[%u].name", index);
*name = GetStringProperty(s);
sprintf(s, "moov.udta.TAG4.entries[%u].value", index);
*value = GetStringProperty(s);
} else {
sprintf(s, "udta.TAG4.entries[%u].name", index);
*name = GetTrackStringProperty(trackId, s);
sprintf(s, "udta.TAG4.entries[%u].value", index);
*value = GetTrackStringProperty(trackId, s);
}
}
bool MP4File::TagGetEntryByName(MP4TrackId trackId, char *name,
const char **value)
{
int numEntries = TagGetNumEntries(trackId);
for (int i = 0; i < numEntries; i++)
{
const char *n = NULL, *v = NULL;
TagGetEntry(trackId, i, &n, &v);
if (!strcmp(n, name))
{
*value = v;
return true;
}
}
return false;
}