Microsoft Technology Licensing, LLC

Kishore Arvind Kotteri

Firoz Dalal

Serge Smirnov

Sanjeev Mehrotra

Thomas W Holcomb

Bharath Siravara

Florin Folta

Hui Gao

Gurpratap Virdi

Wenbo Zhang

Eldar Azerovich Musayev

Frank Dominic Yerrace

Rian Chung

Arthi Gokarn

An audio capture method is performed by a computing system. A plurality of applications is instantiated. An audio data stream is received via audio capture hardware. The audio data stream is stored in a memory space accessible by the plurality of applications. A trigger associated with an application of the plurality of applications is detected. A history segment of the audio data stream is provided from the shared memory space to the application based on the trigger. The history segment is captured prior to the trigger. A contemporary segment of the audio data stream is provided to the application based on the trigger. The contemporary segment is captured subsequent to the trigger.

Providing historical captured audio data to applications

An audio playback method for a virtual machine of a computing system includes instantiating, via a host operating system of the computing system, a virtual machine A shared memory space is allocated for shared access by both the virtual machine and the host operating system. An audio data stream from the virtual machine is received at the shared memory space. The audio data stream is rendered from the shared memory space based on a global audio policy of the host operating system.

Audio rendering from virtual machine

Methods and devices for panning audio may include receiving audio data from an application open on at least one display device of a plurality of display devices in communication with a computer device. The methods and devices may include selecting a set of speakers from a plurality of speakers of the plurality of display devices to receive the audio data in response to speaker location information and application location information with a current location for the application. The methods and devices may include receiving updated application location information with a new location for the application and selecting a new set of speakers from the plurality of speakers to receive the audio data in response to the new location for the application. The methods and devices may include transitioning the audio data from the set of speakers to the new set of speakers.

Sending audio to various channels using application location information

In a computer system that provides for automatic detection and correction of audio system performance issues, an interface receives calls from audio applications for services of the audio system. An audio capture/playback manager executes the calls. A performance monitor tracks the execution of the calls. A rules store maintains one or more rules, each defining criteria for execution of a type of call for audio system services and a corrective action to be taken if the performance monitor indicates the criteria are not met. In this way, performance issues with the audio system can be quickly detected and corrected without user intervention.

Audio system maintenance using system call monitoring

In a computer system that provides for routing of audio content of a target audio application to a requestor audio application, an audio playback/routing manager manages audio routing between audio applications. For example, a requestor audio application may specify a target audio application from which audio content is to be received. An audio playback/routing manager can determine the audio content of the target audio application and provide the requested audio content to the requestor audio application. In this way, rather than receiving all of the audio content being rendered to an audio endpoint, which may include audio content of multiple applications, the requestor audio application can receive only audio content of one or more particular target audio applications.

Selective routing of audio between applications

An indexed file layout, comprising index information, is defined for segmented streaming of multimedia content. The index information can comprise program description information and streaming segment index information. In addition, the layout can comprise files containing streaming segments of the program, where the streaming segments are each encoded at one or more bitrates independently of other streaming segments of the program. The layout supports client switching between different bitrates at segment boundaries. Optimized client-side rate control of streaming content can be provided by defining a plurality of states, selecting available paths based on constraint conditions, and selecting a best path through the states (e.g., based on a distortion measure). In one client-side rate control solution states correspond to a specific bitrate of a specific streaming segment, and in another client-side rate control solution states correspond to a measure of client buffer fullness.

Optimized client side rate control and indexed file layout for streaming media

Embodiments described herein include devices and processes for concurrently processing different audio streams with different hardware-based audio processing modes. A computing device for such embodiments may have multiple hardware audio signal processing modes capable of parallel execution. An operating system or audio stack thereof may manage audio paths or streams for audio sources producing respective types of audio signals. Which of the audio paths or streams will be connected with which of the hardware audio signal processing modes may be determined according to the types of the audio signals. A first hardware audio signal processing mode may be processing a first type of audio signal of a first audio path or stream while concurrently a second hardware audio signal processing mode processes a second type of audio signal of a second audio path or stream.

Multiple concurrent audio modes

A multi-channel audio decoder reconstructs multi-channel audio of more than two physical channels from a reduced set of coded channels based on correlation parameters that specify a full power cross-correlation matrix of the physical channels, or merely preserve a partial correlation matrix (such as power of the physical channels, and some subset of cross-correlations between the physical channels, or cross-correlations of the physical channels with coded or virtual channels).

Channel extension coding for multi-channel source

Access to one or more data streams can be controlled by encrypting a description of how segments of the data streams can be assembled, for example, to produce an audio or video program. Access to the one or more data streams can also be provided by obfuscating names of at least some of the segments in order to make it more difficult to determine the proper order for assembling the segments. In at least some embodiments, the data contained in at least some of the segments themselves is not encrypted.

Controlling access to data streams

The present disclosure relates to playback of video/audio streaming media data to provide a substantially glitch-free experience. The system adapts the media stream to the user connection in order to choose the most desirable stream to avoid glitches. For example, in the case where there is interference (e.g., a microwave being used near a wireless device), the quality of the media stream is lowered. In one embodiment, an index file is used to make logical decisions about which media stream to choose in order to minimize glitches. The index file can take different forms, but, generally, includes characteristics about the available media streams. Example characteristics include the bit rates of the media streams and quality information about the media streams.

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Sammamish, WA, United States of America

Kishore Arvind Kotteri