Sonic Solutions

Roxio, Inc.

Yau-Ting Mau

Yaoyuan Tu

Luke Kien La

Gianluca Macciocca

Robert McKeith

A software driven method for recording multiple sessions on a rewritable DVD is provided. Examples include a software-driven method for appending data to rewritable DVD disc. A rewritable DVD disc for recording, wherein the rewritable DVD disc contains previously written data is received for appending data. A request to append new data to the rewritable DVD disc is received. A file system for the previously written data is located and includes a pointer to the start of the file system. The file system for the previously written data is then read. The file system is modified to continue pointing to files associated with the previously written data and to generate pointers to files of the new data. An updated file system and the new data to the rewritable DVD disc are logically written after the previously written data. The pointer of the file system is then modified to refer to the updated file system.

Methods for recording multiple sessions on a rewritable DVD disc

A method for recording audio data to optical media is provided. The method includes obtaining a number of audio tracks on a source optical media and setting a source optical media device to a maximum read speed for the source optical media device. Also included is reading a first audio track on the source optical media and determining a digital audio extraction (DAX) speed for the first audio track. Further, a mid-point audio track on the source optical media is read and determining of the DAX speed for the mid-point audio track on the source optical media is processed. The method further includes calculating a record speed for the number of audio tracks on the source optical media to a destination optical media. The DAX speed for the first audio track is used for recording the first audio track through an audio track immediately preceding the mid-point audio track, and the DAX speed for the mid-point audio track on the source optical media is used for recording the mid-point audio track through a last audio track.

Methods for establishing audio track digital audio extraction speed

Methods for determining recording speeds to optical media are provided. In one example, a method includes an algorithm in which a digital audio extraction (DAX) speed is determined for a first part of an audio track is measured, a DAX speed for an end part of an audio track is measured, and the DAX speeds are compared. The slower of the two speeds is selected as the DAX speed for the audio track. Subsequent audio tracks are sampled by first measuring the DAX speed for an end part of the audio track. If the DAX speed for the end part of the audio track is faster than the DAX speed for the end part of the previous audio track, the first part of the audio track is sampled, and the slower DAX speed of the first and end parts of the audio track is selected as the DAX speed for the audio track.

Methods for the recording of data to an optical media are provided. In one example, a method includes the determining of the length of a single audio file. A test burn is then performed in which all of the operations required to record the single audio file to optical media are performed except the actual transfer of data to the optical media. During the test burn, the amount of time required to decode the single audio file is measured, and then a codec decoding factor is calculated. The codec decoding factor is equal to the length of the single audio file divided by the amount of time required to decode the single audio file. The codec decoding factor is used to set the recording speed of a selected optical recording device to avoid buffer under-run.

Methods for establishing recording rates of optical media recorders

Methods and computer readable media with program instructions for dynamically determining write speeds of an optical media device are provided. In one example, a method includes setting a device set write speed to a maximum write speed of the optical media device, and then verifying that the device set write speed is as just set. If the optical media device is verified to be as just set, a current set write speed is saved. The device set write speed is then decreased by an increment and the device set. The device set write speed is again verified to be as just set, and saved if verified. The method continues to decrease the device set write speed by an increment, set, verify, and save until the device set write speed is set to zero. Only verified set write speeds are presented as options for user interaction for the optical media device.

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Fremont, CA, United States of America

Yau-Ting Mau