Invention Grant
- Patent Title: Control of video decoder for reverse playback operation
- Patent Title (中): 控制视频解码器进行反向播放操作
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Application No.: US12013268Application Date: 2008-01-11
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Publication No.: US08179976B2Publication Date: 2012-05-15
- Inventor: John Samuel Bushell
- Applicant: John Samuel Bushell
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kenyon & Kenyon LLP
- Main IPC: H04N11/02
- IPC: H04N11/02

Abstract:
A video decoder includes a mode of operation for reverse playback that includes dividing a sequence of coded video data into groups of pictures (GOPs) and further subdividing the groups of pictures into a plurality of spans. GOPs extend in coding order from a first key frame to a terminal frame that precedes another key frame in coding order. Each span is processed in reverse coding order by decoding the first key frame and any reference frames that precede the currently processed span in coding order, selecting a plurality of frames from the currently processed span for decode and display and further selecting for decode but not display any reference frames from the currently processed span that were omitted by the first selection. All selected frames are decoded but only those marked for display are rendered at a display device. The method accommodates control parameters that define the number of spans selected from each GOP and the number of frames selected from each span for decoded and display. Via these control parameters, operation of the method may be tuned to local decoding environments for which processing resources and decoded picture buffer sizes may be unknown.
Public/Granted literature
- US20090180533A1 CONTROL OF VIDEO DECODER FOR REVERSE PLAYBACK OPERATION Public/Granted day:2009-07-16
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