ISMACrypt Support

ISMACrypt Support. More...

Macros
#define	ISMA_selective_encrypt   0x80

Functions
MP4Err	ISMATransformSampleEntry (u32 newTrackFlags, MP4Handle insampleEntryH, u8 selective_encryption, u8 key_indicator_length, u8 IV_length, char *kms_URL, MP4Handle outsampleEntryH)
	‘Transforms’ a sample entry into the format expected by ISMA for a sample entry for protected (encrypted) content.
MP4Err	ISMAUnTransformSampleEntry (MP4Handle insampleEntryH, u8 *selective_encryption, u8 *key_indicator_length, u8 *IV_length, char **kms_URL, MP4Handle outsampleEntryH)
	‘Untransforms’ a sample entry, from the encrypted form to the standard form.
MP4Err	ISMATransformSampleEntrySalt (u32 newTrackFlags, MP4Handle insampleEntryH, u8 selective_encryption, u8 key_indicator_length, u8 IV_length, char *kms_URL, u64 salt, MP4Handle outsampleEntryH)
	‘Transforms’ a sample entry into the format expected by ISMA for a sample entry for protected (encrypted) content.
MP4Err	ISMAUnTransformSampleEntrySalt (MP4Handle insampleEntryH, u8 *selective_encryption, u8 *key_indicator_length, u8 *IV_length, char **kms_URL, u64 *salt, MP4Handle outsampleEntryH)
	‘Untransforms’ a sample entry, from the encrypted form to the standard form.

Detailed Description

ISMACrypt Support.

Function Documentation

ISMATransformSampleEntry()

MP4Err ISMATransformSampleEntry	(	u32	newTrackFlags,
		MP4Handle	insampleEntryH,
		u8	selective_encryption,
		u8	key_indicator_length,
		u8	IV_length,
		char *	kms_URL,
		MP4Handle	outsampleEntryH
	)

‘Transforms’ a sample entry into the format expected by ISMA for a sample entry for protected (encrypted) content.

The flags are the same as for new tracks (audio or video track).

Note

it is possible to build without ISMACrypt support using an ifdef.

ISMATransformSampleEntrySalt()

MP4Err ISMATransformSampleEntrySalt	(	u32	newTrackFlags,
		MP4Handle	insampleEntryH,
		u8	selective_encryption,
		u8	key_indicator_length,
		u8	IV_length,
		char *	kms_URL,
		u64	salt,
		MP4Handle	outsampleEntryH
	)

‘Transforms’ a sample entry into the format expected by ISMA for a sample entry for protected (encrypted) content.

The flags are the same as for new tracks (audio or video track). The salt is an initial salt value which will be stored in the file if non-zero.

Note

it is possible to build without ISMACrypt support using an ifdef.

ISMAUnTransformSampleEntry()

MP4Err ISMAUnTransformSampleEntry	(	MP4Handle	insampleEntryH,
		u8 *	selective_encryption,
		u8 *	key_indicator_length,
		u8 *	IV_length,
		char **	kms_URL,
		MP4Handle	outsampleEntryH
	)

‘Untransforms’ a sample entry, from the encrypted form to the standard form.

Returns the encryption parameter information previously supplied to the previous function.

ISMAUnTransformSampleEntrySalt()

MP4Err ISMAUnTransformSampleEntrySalt	(	MP4Handle	insampleEntryH,
		u8 *	selective_encryption,
		u8 *	key_indicator_length,
		u8 *	IV_length,
		char **	kms_URL,
		u64 *	salt,
		MP4Handle	outsampleEntryH
	)

‘Untransforms’ a sample entry, from the encrypted form to the standard form.

Returns the encryption parameter information previously supplied to the previous function, filling in salt if it was supplied in the file.