Apple Inc.

James E McCartney

William George Stewart

Douglas S Wyatt

David Thall

Christopher A Wolfe

An audio engine is provided for acoustically rendering a three-dimensional virtual environment. The audio engine uses geometric volumes to represent sound sources and any sound occluders. A volumetric response is generated based on sound projected from a volumetric sound source to a listener, taking into consideration any volumetric occluders in-between. The audio engine also provides for modification of a level of detail of sound over time based on distance between a listener and a sound source. Other aspects are also described and claimed.

3D audio rendering using volumetric audio rendering and scripted audio level-of-detail

Method for improving audio time stretching starts with processor receiving input media file and rate schedule. Rate schedule includes identification of portions of input media file and playback output rates associated with each of the portions of input media file. Writer thread being executed by processor generates timeline that is linked list including segments that respectively represent portions of input media file and associated playback output rates as desired playback rate curves. Generating timeline include writing each segment in linked list to end of linked list. Processor then performs time scaling of media file based on rate schedule to generate output media file. Performing time scaling of media file includes identifying by reader thread being executed by processor a segment in timeline corresponding to desired output time, and translating by reader thread desired output time to corresponding input time based on identified segment. Other embodiments are described.

System and method of improving audio time stretching using timeline

Storing audio data encoded in any of a plurality of different audio encoding formats is enabled by parametrically defining the underlying format in which the audio data is encoded, in audio format and packet table chunks. A flag can be used to manage storage of the size of the audio data portion of the file, such that premature termination of an audio recording session does not result in an unreadable corrupted file. This capability can be enabled by initially setting the flag to a value that does not correspond to a valid audio data size and that indicates that the last chunk in the file contains the audio data. State information for the audio data, to effectively denote a version of the file, and a dependency indicator for dependent metadata, may be maintained, where the dependency indicator indicates the state of the audio data on which the metadata is dependent.

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Cupertino, CA, United States of America

James E McCartney