Intel Corporation

Adeel A Aslam

Alberto J Martinez

Kar Leong Wong

Reshma Lal

Pradeep M Pappachan

Ernie F Brickell

Steven Bernard McGowan

Sudha Krishnakumar

John S Howard

Darren L Abramson

Karthi R Vadivelu

Abdul Rahman Ismail

Satheesh Chellappan

Devon Worrell

David Hines

Aruni P Nelson

Binu John

Shanthanand R Kutuva

Example apparatus disclosed herein compare one or more audio latency characteristics with one or more audio latency requirements in response to detection of an audio silence event, the audio latency characteristic(s) associated with at least one of a hardware layer or a device layer of an audio stack of a compute device, the audio latency requirement(s) associated with an application. Disclosed example apparatus also control a device layer of the audio stack to enter a device layer low power mode in response to a first determination that the audio latency requirement(s) is/are met by the audio latency characteristic(s). Disclosed example apparatus further control a hardware layer of the audio stack to enter a hardware layer low power mode in response to the first determination and a second determination that an operation condition for entry into the hardware layer low power mode is met.

Audio stack power control based on latency

Technologies for cryptographic protection of I/O audio data include a computing device with a cryptographic engine and an audio controller. A trusted software component may request an untrusted audio driver to establish an audio session with the audio controller that is associated with an audio codec. The trusted software component may verify that a stream identifier associated with the audio session received from the audio driver matches a stream identifier received from the codec. The trusted software may program the cryptographic engine with a DMA channel identifier associated with the codec, and the audio controller may assert the channel identifier in each DMA transaction associated with the audio session. The cryptographic engine cryptographically protects audio data associated with the audio session. The audio controller may lock the controller topology after establishing the audio session, to prevent re-routing of audio during a trusted audio session. Other embodiments are described and claimed.

Technologies for protecting audio data with trusted I/O

An example apparatus includes: a host controller offload capability detector to determine that a media stream offload capability is available in the peripheral interface host controller; a media stream offload arbiter to send a media stream offload request to a media processor manager based on the media stream offload capability and based on a peripheral device being connected to the peripheral interface host controller; and an endpoint mapper to generate an endpoint table entry corresponding to the peripheral device, the endpoint table entry to assign a first communication interface of the peripheral interface host controller to transfer a media stream corresponding to the peripheral device between the media processor and the peripheral interface host controller without the media stream being routed to an application processor that is in circuit with the peripheral interface host controller and in circuit with the media processor.

Methods and apparatus to offload media streams in host devices

Methods and apparatus for mixing encrypted data with unencrypted data are disclosed. A disclosed system receives data from a first media source, such as DVD-Audio content, and encrypts the data from the first media source using a key stream to form an encrypted data stream. The disclosed system may separate the encrypted data stream into a plurality of encrypted data streams and may combine the plurality of encrypted data streams with an unencrypted data stream associated with a second media source to form a mixed data stream. The mixed data stream is formed without decrypting the plurality of encrypted data streams and is transmitted to hardware or a hardware driver.

Methods and apparatus for mixing encrypted data with unencrypted data

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Folsom, CA, United States of America

Adeel A Aslam