/*----------------------------------------------------------------------
| AP4_Track::GetHandlerType
+---------------------------------------------------------------------*/
AP4_UI32
AP4_Track::GetHandlerType()
{
if (m_TrakAtom) {
AP4_HdlrAtom* hdlr = AP4_DYNAMIC_CAST(AP4_HdlrAtom, m_TrakAtom->FindChild("mdia/hdlr"));
if (hdlr) {
return hdlr->GetHandlerType();
}
}
return 0;
}
/*----------------------------------------------------------------------
| AP4_Track::AP4_Track
+---------------------------------------------------------------------*/
AP4_Track::AP4_Track(AP4_TrakAtom& atom,
AP4_ByteStream& sample_stream,
AP4_UI32 movie_time_scale) :
m_TrakAtom(&atom),
m_TrakAtomIsOwned(false),
m_Type(TYPE_UNKNOWN),
m_SampleTable(NULL),
m_SampleTableIsOwned(true),
m_MovieTimeScale(movie_time_scale),
m_MediaTimeScale(0)
{
// find the handler type
AP4_Atom* sub = atom.FindChild("mdia/hdlr");
if (sub) {
AP4_HdlrAtom* hdlr = dynamic_cast<AP4_HdlrAtom*>(sub);
if (hdlr) {
AP4_Atom::Type type = hdlr->GetHandlerType();
if (type == AP4_HANDLER_TYPE_SOUN) {
m_Type = TYPE_AUDIO;
} else if (type == AP4_HANDLER_TYPE_VIDE) {
m_Type = TYPE_VIDEO;
} else if (type == AP4_HANDLER_TYPE_TEXT) {
m_Type = TYPE_TEXT;
} else if (type == AP4_HANDLER_TYPE_TX3G) {
m_Type = TYPE_TEXT;
} else if (type == AP4_HANDLER_TYPE_SUBP) {
m_Type = TYPE_SUBP;
} else if (type == AP4_HANDLER_TYPE_HINT) {
m_Type = TYPE_HINT;
}
}
}
// get the media time scale
sub = atom.FindChild("mdia/mdhd");
if (sub) {
AP4_MdhdAtom* mdhd = dynamic_cast<AP4_MdhdAtom*>(sub);
if (mdhd) {
m_MediaTimeScale = mdhd->GetTimeScale();
}
}
// create a facade for the stbl atom
AP4_ContainerAtom* stbl = dynamic_cast<AP4_ContainerAtom*>(
atom.FindChild("mdia/minf/stbl"));
if (stbl) {
m_SampleTable = DNew AP4_AtomSampleTable(stbl, sample_stream);
}
}
/*----------------------------------------------------------------------
| AP4_Track::AP4_Track
+---------------------------------------------------------------------*/
AP4_Track::AP4_Track(AP4_TrakAtom& atom,
AP4_ByteStream& sample_stream,
AP4_UI32 movie_time_scale) :
m_TrakAtom(&atom),
m_TrakAtomIsOwned(false),
m_Type(TYPE_UNKNOWN),
m_SampleTable(NULL),
m_SampleTableIsOwned(true),
m_MovieTimeScale(movie_time_scale)
{
// find the handler type
AP4_Atom* sub = atom.FindChild("mdia/hdlr");
if (sub) {
AP4_HdlrAtom* hdlr = AP4_DYNAMIC_CAST(AP4_HdlrAtom, sub);
if (hdlr) {
AP4_UI32 type = hdlr->GetHandlerType();
if (type == AP4_HANDLER_TYPE_SOUN) {
m_Type = TYPE_AUDIO;
} else if (type == AP4_HANDLER_TYPE_VIDE) {
m_Type = TYPE_VIDEO;
} else if (type == AP4_HANDLER_TYPE_HINT) {
m_Type = TYPE_HINT;
} else if (type == AP4_HANDLER_TYPE_ODSM ||
type == AP4_HANDLER_TYPE_SDSM) {
m_Type = TYPE_SYSTEM;
} else if (type == AP4_HANDLER_TYPE_TEXT ||
type == AP4_HANDLER_TYPE_TX3G) {
m_Type = TYPE_TEXT;
} else if (type == AP4_HANDLER_TYPE_JPEG) {
m_Type = TYPE_JPEG;
} else if (type == AP4_HANDLER_TYPE_SUBT) {
m_Type = TYPE_SUBTITLES;
}
}
}
// create a facade for the stbl atom
AP4_ContainerAtom* stbl = AP4_DYNAMIC_CAST(AP4_ContainerAtom, atom.FindChild("mdia/minf/stbl"));
if (stbl) {
m_SampleTable = new AP4_AtomSampleTable(stbl, sample_stream);
}
}
/*----------------------------------------------------------------------
| AP4_OmaDcfEncryptingProcessor:CreateTrackHandler
+---------------------------------------------------------------------*/
AP4_Processor::TrackHandler*
AP4_OmaDcfEncryptingProcessor::CreateTrackHandler(AP4_TrakAtom* trak)
{
// find the stsd atom
AP4_StsdAtom* stsd = AP4_DYNAMIC_CAST(AP4_StsdAtom, trak->FindChild("mdia/minf/stbl/stsd"));
// avoid tracks with no stsd atom (should not happen)
if (stsd == NULL) return NULL;
// only look at the first sample description
AP4_SampleEntry* entry = stsd->GetSampleEntry(0);
if (entry == NULL) return NULL;
// create a handler for this track if we have a key for it and we know
// how to map the type
const AP4_DataBuffer* key;
const AP4_DataBuffer* iv;
AP4_UI32 format = 0;
if (AP4_SUCCEEDED(m_KeyMap.GetKeyAndIv(trak->GetId(), key, iv))) {
switch (entry->GetType()) {
case AP4_ATOM_TYPE_MP4A:
format = AP4_ATOM_TYPE_ENCA;
break;
case AP4_ATOM_TYPE_MP4V:
case AP4_ATOM_TYPE_AVC1:
case AP4_ATOM_TYPE_AVC2:
case AP4_ATOM_TYPE_AVC3:
case AP4_ATOM_TYPE_AVC4:
case AP4_ATOM_TYPE_HEV1:
case AP4_ATOM_TYPE_HVC1:
format = AP4_ATOM_TYPE_ENCV;
break;
default: {
// try to find if this is audio or video
AP4_HdlrAtom* hdlr = AP4_DYNAMIC_CAST(AP4_HdlrAtom, trak->FindChild("mdia/hdlr"));
if (hdlr) {
switch (hdlr->GetHandlerType()) {
case AP4_HANDLER_TYPE_SOUN:
format = AP4_ATOM_TYPE_ENCA;
break;
case AP4_HANDLER_TYPE_VIDE:
format = AP4_ATOM_TYPE_ENCV;
break;
}
}
break;
}
}
if (format) {
const char* content_id = m_PropertyMap.GetProperty(trak->GetId(), "ContentId");
const char* rights_issuer_url = m_PropertyMap.GetProperty(trak->GetId(), "RightsIssuerUrl");
AP4_DataBuffer textual_headers;
AP4_Result result = m_PropertyMap.GetTextualHeaders(trak->GetId(), textual_headers);
if (AP4_FAILED(result)) textual_headers.SetDataSize(0);
// create the block cipher
AP4_BlockCipher* block_cipher = NULL;
AP4_BlockCipher::CtrParams ctr_params;
AP4_BlockCipher::CipherMode cipher_mode;
const void* cipher_params = NULL;
if (m_CipherMode == AP4_OMA_DCF_CIPHER_MODE_CBC) {
cipher_mode = AP4_BlockCipher::CBC;
} else if (m_CipherMode == AP4_OMA_DCF_CIPHER_MODE_CTR) {
cipher_mode = AP4_BlockCipher::CTR;
ctr_params.counter_size = 16;
cipher_params = &ctr_params;
} else {
return NULL;
}
result = m_BlockCipherFactory->CreateCipher(AP4_BlockCipher::AES_128,
AP4_BlockCipher::ENCRYPT,
cipher_mode,
cipher_params,
key->GetData(),
key->GetDataSize(),
block_cipher);
if (AP4_FAILED(result)) return NULL;
return new AP4_OmaDcfTrackEncrypter(m_CipherMode,
block_cipher,
iv->GetData(),
entry,
format,
content_id,
rights_issuer_url,
textual_headers.GetData(),
textual_headers.GetDataSize());
}
}
return NULL;
}
/*----------------------------------------------------------------------
| AP4_MarlinIpmpEncryptingProcessor::Initialize
+---------------------------------------------------------------------*/
AP4_Result
AP4_MarlinIpmpEncryptingProcessor::Initialize(
AP4_AtomParent& top_level,
AP4_ByteStream& /*stream*/,
AP4_Processor::ProgressListener* /*listener = NULL*/)
{
// get the moov atom
AP4_MoovAtom* moov = AP4_DYNAMIC_CAST(AP4_MoovAtom, top_level.GetChild(AP4_ATOM_TYPE_MOOV));
if (moov == NULL) return AP4_ERROR_INVALID_FORMAT;
// deal with the file type
AP4_FtypAtom* ftyp = AP4_DYNAMIC_CAST(AP4_FtypAtom, top_level.GetChild(AP4_ATOM_TYPE_FTYP));
if (ftyp) {
// remove the atom, it will be replaced with a new one
top_level.RemoveChild(ftyp);
// keep the existing brand and compatible brands
AP4_Array<AP4_UI32> compatible_brands;
compatible_brands.EnsureCapacity(ftyp->GetCompatibleBrands().ItemCount()+1);
for (unsigned int i=0; i<ftyp->GetCompatibleBrands().ItemCount(); i++) {
compatible_brands.Append(ftyp->GetCompatibleBrands()[i]);
}
// add the MGSV compatible brand if it is not already there
if (!ftyp->HasCompatibleBrand(AP4_MARLIN_BRAND_MGSV)) {
compatible_brands.Append(AP4_MARLIN_BRAND_MGSV);
}
// create a replacement for the major brand
AP4_FtypAtom* new_ftyp = new AP4_FtypAtom(AP4_MARLIN_BRAND_MGSV,
0x13c078c, //AP4_MARLIN_BRAND_MGSV_MAJOR_VERSION,
&compatible_brands[0],
compatible_brands.ItemCount());
delete ftyp;
ftyp = new_ftyp;
} else {
AP4_UI32 isom = AP4_FTYP_BRAND_ISOM;
ftyp = new AP4_FtypAtom(AP4_MARLIN_BRAND_MGSV, 0, &isom, 1);
}
// insert the ftyp atom as the first child
top_level.AddChild(ftyp, 0);
// create and 'mpod' track reference atom
AP4_TrefTypeAtom* mpod = new AP4_TrefTypeAtom(AP4_ATOM_TYPE_MPOD);
// look for an available track ID, starting at 1
unsigned int od_track_id = 0;
unsigned int od_track_position = 0;
for (AP4_List<AP4_TrakAtom>::Item* trak_item = moov->GetTrakAtoms().FirstItem();
trak_item;
trak_item = trak_item->GetNext()) {
AP4_TrakAtom* trak = trak_item->GetData();
if (trak) {
od_track_position++;
if (trak->GetId() >= od_track_id) {
od_track_id = trak->GetId()+1;
}
// if the track is encrypted, reference it in the mpod
if (m_KeyMap.GetKey(trak->GetId())) {
mpod->AddTrackId(trak->GetId());
}
//m_SinfEntries.Add(new SinfEntry(trak->GetId(), NULL));
}
}
// check that there was at least one track in the file
if (od_track_id == 0) return AP4_ERROR_INVALID_FORMAT;
// create an initial object descriptor
AP4_InitialObjectDescriptor* iod =
// FIXME: get real values from the property map
new AP4_InitialObjectDescriptor(AP4_DESCRIPTOR_TAG_MP4_IOD,
1022, // object descriptor id
false,
0xFE, // OD profile level (0xFE = No OD profile specified)
0xFF, // scene profile level
0xFE, // audio profile level
0xFE, // visual profile level
0xFF); // graphics profile
// create an ES_ID_Inc subdescriptor and add it to the initial object descriptor
AP4_EsIdIncDescriptor* es_id_inc = new AP4_EsIdIncDescriptor(od_track_id);
iod->AddSubDescriptor(es_id_inc);
// create an iods atom to hold the initial object descriptor
AP4_IodsAtom* iods = new AP4_IodsAtom(iod);
// add the iods atom to the moov atom (try to put it just after mvhd)
int iods_position = 0;
int item_position = 0;
for (AP4_List<AP4_Atom>::Item* moov_item = moov->GetChildren().FirstItem();
moov_item;
moov_item = moov_item->GetNext()) {
++item_position;
if (moov_item->GetData()->GetType() == AP4_ATOM_TYPE_MVHD) {
iods_position = item_position;
break;
}
}
AP4_Result result = moov->AddChild(iods, iods_position);
if (AP4_FAILED(result)) {
delete iods;
return result;
}
// create a sample table for the OD track
AP4_SyntheticSampleTable* od_sample_table = new AP4_SyntheticSampleTable();
// create the sample description for the OD track
AP4_MpegSystemSampleDescription* od_sample_description;
od_sample_description = new AP4_MpegSystemSampleDescription(AP4_STREAM_TYPE_OD,
AP4_OTI_MPEG4_SYSTEM,
NULL,
32768, // buffer size
1024, // max bitrate
512); // avg bitrate
od_sample_table->AddSampleDescription(od_sample_description, true);
// create the OD descriptor update
AP4_DescriptorUpdateCommand od_update(AP4_COMMAND_TAG_OBJECT_DESCRIPTOR_UPDATE);
for (unsigned int i=0; i<mpod->GetTrackIds().ItemCount(); i++) {
AP4_ObjectDescriptor* od = new AP4_ObjectDescriptor(AP4_DESCRIPTOR_TAG_MP4_OD, 256+i); // descriptor id = 256+i
od->AddSubDescriptor(new AP4_EsIdRefDescriptor(i+1)); // index into mpod (1-based)
od->AddSubDescriptor(new AP4_IpmpDescriptorPointer(i+1)); // descriptor id = i+1
od_update.AddDescriptor(od);
}
// create the IPMP descriptor update
AP4_DescriptorUpdateCommand ipmp_update(AP4_COMMAND_TAG_IPMP_DESCRIPTOR_UPDATE);
for (unsigned int i=0; i<mpod->GetTrackIds().ItemCount(); i++) {
// create the ipmp descriptor
AP4_IpmpDescriptor* ipmp_descriptor = new AP4_IpmpDescriptor(i+1, AP4_MARLIN_IPMPS_TYPE_MGSV);
// create the sinf container
AP4_ContainerAtom* sinf = new AP4_ContainerAtom(AP4_ATOM_TYPE_SINF);
// add the scheme type atom
sinf->AddChild(new AP4_SchmAtom(m_UseGroupKey?
AP4_PROTECTION_SCHEME_TYPE_MARLIN_ACGK:
AP4_PROTECTION_SCHEME_TYPE_MARLIN_ACBC,
0x0100, NULL, true));
// create the 'schi' container
AP4_ContainerAtom* schi = new AP4_ContainerAtom(AP4_ATOM_TYPE_SCHI);
// add the content ID
const char* content_id = m_PropertyMap.GetProperty(mpod->GetTrackIds()[i], "ContentId");
if (content_id) {
// add the content ID (8id_)
schi->AddChild(new AP4_NullTerminatedStringAtom(AP4_ATOM_TYPE_8ID_, content_id));
}
// find what the track type is (necessary for the next step) and the key
const AP4_DataBuffer* key = NULL;
AP4_Track::Type track_type = AP4_Track::TYPE_UNKNOWN;
for (AP4_List<AP4_TrakAtom>::Item* trak_item = moov->GetTrakAtoms().FirstItem();
trak_item;
trak_item = trak_item->GetNext()) {
AP4_TrakAtom* trak = trak_item->GetData();
if (trak->GetId() == mpod->GetTrackIds()[i]) {
// find the handler type
AP4_Atom* sub = trak->FindChild("mdia/hdlr");
if (sub) {
AP4_HdlrAtom* hdlr = AP4_DYNAMIC_CAST(AP4_HdlrAtom, sub);
if (hdlr) {
AP4_UI32 type = hdlr->GetHandlerType();
if (type == AP4_HANDLER_TYPE_SOUN) {
track_type = AP4_Track::TYPE_AUDIO;
} else if (type == AP4_HANDLER_TYPE_VIDE) {
track_type = AP4_Track::TYPE_VIDEO;
}
}
}
// find the key
key = m_KeyMap.GetKey(trak->GetId());
break;
}
}
// group key
if (m_UseGroupKey && key) {
// find the group key
const AP4_DataBuffer* group_key = m_KeyMap.GetKey(0);
if (group_key) {
AP4_DataBuffer wrapped_key;
result = AP4_AesKeyWrap(group_key->GetData(), key->GetData(), key->GetDataSize(), wrapped_key);
if (AP4_FAILED(result)) return result;
AP4_UnknownAtom* gkey = new AP4_UnknownAtom(AP4_ATOM_TYPE_GKEY,
wrapped_key.GetData(),
wrapped_key.GetDataSize());
schi->AddChild(gkey);
}
}
// create and add the security attributes (satr)
if (track_type != AP4_Track::TYPE_UNKNOWN && key != NULL && key != NULL) {
AP4_ContainerAtom* satr = new AP4_ContainerAtom(AP4_ATOM_TYPE_SATR);
switch (track_type) {
case AP4_Track::TYPE_AUDIO:
satr->AddChild(new AP4_NullTerminatedStringAtom(AP4_ATOM_TYPE_STYP, AP4_MARLIN_IPMP_STYP_AUDIO));
break;
case AP4_Track::TYPE_VIDEO:
satr->AddChild(new AP4_NullTerminatedStringAtom(AP4_ATOM_TYPE_STYP, AP4_MARLIN_IPMP_STYP_VIDEO));
break;
default:
break;
}
// add the signed attributes, if any
const char* signed_attributes = m_PropertyMap.GetProperty(mpod->GetTrackIds()[i], "SignedAttributes");
if (signed_attributes) {
// decode the hex-encoded data
unsigned int size = (unsigned int)AP4_StringLength(signed_attributes)/2;
AP4_DataBuffer attributes_atoms;
attributes_atoms.SetDataSize(size);
if (AP4_SUCCEEDED(AP4_ParseHex(signed_attributes, attributes_atoms.UseData(), size))) {
// parse all the atoms encoded in the data and add them to the 'schi' container
AP4_MemoryByteStream* mbs = new AP4_MemoryByteStream(attributes_atoms.GetData(),
attributes_atoms.GetDataSize());
do {
AP4_Atom* atom = NULL;
result = AP4_DefaultAtomFactory::Instance.CreateAtomFromStream(*mbs, atom);
if (AP4_SUCCEEDED(result) && atom) {
satr->AddChild(atom);
}
} while (AP4_SUCCEEDED(result));
mbs->Release();
}
}
// compute the hmac
AP4_MemoryByteStream* mbs = new AP4_MemoryByteStream();
satr->Write(*mbs);
AP4_Hmac* digester = NULL;
AP4_Hmac::Create(AP4_Hmac::SHA256, key->GetData(), key->GetDataSize(), digester);
digester->Update(mbs->GetData(), mbs->GetDataSize());
AP4_DataBuffer hmac_value;
digester->Final(hmac_value);
AP4_Atom* hmac = new AP4_UnknownAtom(AP4_ATOM_TYPE_HMAC, hmac_value.GetData(), hmac_value.GetDataSize());
schi->AddChild(satr);
schi->AddChild(hmac);
mbs->Release();
}
sinf->AddChild(schi);
// serialize the sinf atom to a buffer and set it as the ipmp data
AP4_MemoryByteStream* sinf_data = new AP4_MemoryByteStream((AP4_Size)sinf->GetSize());
sinf->Write(*sinf_data);
ipmp_descriptor->SetData(sinf_data->GetData(), sinf_data->GetDataSize());
sinf_data->Release();
ipmp_update.AddDescriptor(ipmp_descriptor);
}
// add the sample with the descriptors and updates
AP4_MemoryByteStream* sample_data = new AP4_MemoryByteStream();
od_update.Write(*sample_data);
ipmp_update.Write(*sample_data);
od_sample_table->AddSample(*sample_data, 0, sample_data->GetDataSize(), 0, 0, 0, 0, true);
// create the OD track
AP4_TrakAtom* od_track = new AP4_TrakAtom(od_sample_table,
AP4_HANDLER_TYPE_ODSM,
"Bento4 Marlin OD Handler",
od_track_id,
0, 0,
1, 1000, 1, 0, "und",
0, 0);
// add an entry in the processor's stream table to indicate that the
// media data for the OD track is not in the file stream, but in our
// memory stream.
m_ExternalTrackData.Add(new ExternalTrackData(od_track_id, sample_data));
sample_data->Release();
// add a tref track reference atom
AP4_ContainerAtom* tref = new AP4_ContainerAtom(AP4_ATOM_TYPE_TREF);
tref->AddChild(mpod);
od_track->AddChild(tref, 1); // add after 'tkhd'
// add the track to the moov atoms (just after the last track)
moov->AddChild(od_track, od_track_position);
return AP4_SUCCESS;
}
