Method for addressing a bitstream recording

G - Physics – 11 – B

Patent

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G11B 27/32 (2006.01) G11B 20/12 (2006.01) G11B 27/034 (2006.01) G11B 27/10 (2006.01) G11B 27/30 (2006.01) G11B 27/34 (2006.01) H04N 9/804 (2006.01) H04N 7/24 (2006.01)

Patent

CA 2339680

In bitstream recording presentation data is organised into Video Object Units. These have a variable size but have also a variable duration. To allow access to any Video Object Unit in the bitstream a mapping list is used which is based on pieces (SOBU#n) of the bitstream of constant size per piece. The mapping list additionally contains for each of these pieces a specific delta duration (IAPAT#n) which indicates the difference between the arrival time of the first packet of a piece and the arrival time of the packet following immediately the last packet of that piece, and contains an initialisation value (IAPAT#0) which allows to have a share of equal bits between a predetermined amount of MSBs of application time stamps (ATS) and the same amount of LSBs of the summation of said delta time durations (IAPAT#n).

Dans un enregistrement de flux binaire, les données de présentation sont agencées en unités objet vidéo. Ces unités sont de dimensions et de durées variables. On utilise, pour permettre un accès à n'importe quelle unité objet vidéo dans le flux binaire, une liste de mappage basée sur des pièces (SOBU# n) du flux binaire, chaque pièce étant d'une taille uniforme. Pour chacune de ces pièces, la liste de mappage, qui contient, de surcroît, une durée delta spécifique (IAPAT# n) indiquant la différence de temps existant entre le moment d'arrivée du premier paquet d'une pièce et le moment d'arrivée du paquet suivant immédiatement le dernier paquet de cette pièce, contient également une valeur d'initialisation (IAPAT# 0) permettant d'avoir un partage binaire égal entre un nombre prédéterminée de bits les plus significatifs (MSB) d'heures système d'application (ATS) et le même nombre de bits les moins significatifs (LSB) des durées delta (IAPAT# n).

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