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Various MP4Decrypt fixes #420

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Various MP4Decrypt fixes #420

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0c10f12
Fix show-progress argument for mp4decrypt
truedread Aug 13, 2019
907235e
Fix for PIFF encryption type and selection of track by KID
truedread Aug 13, 2019
3d0d258
Merge branch 'axiomatic-systems:master' into master
truedread Jun 22, 2023
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16 changes: 15 additions & 1 deletion Source/C++/Core/Ap4CommonEncryption.cpp
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Expand Up @@ -2315,7 +2315,7 @@ AP4_CencFragmentDecrypter::ProcessSample(AP4_DataBuffer& data_in,
/*----------------------------------------------------------------------
| AP4_CencDecryptingProcessor::AP4_CencDecryptingProcessor
+---------------------------------------------------------------------*/
AP4_CencDecryptingProcessor::AP4_CencDecryptingProcessor(const AP4_ProtectionKeyMap* key_map,
AP4_CencDecryptingProcessor::AP4_CencDecryptingProcessor(AP4_ProtectionKeyMap* key_map,
AP4_BlockCipherFactory* block_cipher_factory) :
m_KeyMap(key_map)
{
Expand Down Expand Up @@ -2359,6 +2359,20 @@ AP4_CencDecryptingProcessor::CreateTrackHandler(AP4_TrakAtom* trak)
sample_descs.Append(protected_desc);
sample_entries.Append(sample_entry);
}

AP4_ContainerAtom* schi = protected_desc->GetSchemeInfo()->GetSchiAtom();
if (schi != NULL) {
AP4_CencTrackEncryption* tenc;
if (protected_desc->GetSchemeType() == AP4_PROTECTION_SCHEME_TYPE_PIFF) {
tenc = AP4_DYNAMIC_CAST(AP4_CencTrackEncryption, schi->GetChild(AP4_ATOM_TYPE_UUID));
} else {
tenc = AP4_DYNAMIC_CAST(AP4_CencTrackEncryption, schi->GetChild(AP4_ATOM_TYPE_TENC));
}
if (tenc != NULL) {
const AP4_DataBuffer* key = m_KeyMap->GetKeyByKid(tenc->GetDefaultKid());
if (key != NULL) m_KeyMap->SetKey(trak->GetId(), key->GetData(), 16);
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Writing to the key map from AP4_CencDecryptingProcessor breaks the constness of that map. It doesn't seem right. Can you explain why you need to write a key here?

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mp4decrypt couldn't properly handle selecting the track based on key ID, it only seemed to work by track ID.

}
}
}
}
if (sample_entries.ItemCount() == 0) return NULL;
Expand Down
4 changes: 2 additions & 2 deletions Source/C++/Core/Ap4CommonEncryption.h
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Expand Up @@ -653,7 +653,7 @@ class AP4_CencDecryptingProcessor : public AP4_Processor
{
public:
// constructor
AP4_CencDecryptingProcessor(const AP4_ProtectionKeyMap* key_map,
AP4_CencDecryptingProcessor(AP4_ProtectionKeyMap* key_map,
AP4_BlockCipherFactory* block_cipher_factory = NULL);

// AP4_Processor methods
Expand All @@ -667,7 +667,7 @@ class AP4_CencDecryptingProcessor : public AP4_Processor
protected:
// members
AP4_BlockCipherFactory* m_BlockCipherFactory;
const AP4_ProtectionKeyMap* m_KeyMap;
AP4_ProtectionKeyMap* m_KeyMap;
};

/*----------------------------------------------------------------------
Expand Down