Capturing frames from an external source

摘要

Methods and apparatus, including computer program products, for designating a memory region for receiving image frames from an image frame server, the image frames are from a first sequence of image frames. Each image frame in the first sequence of image frames is associated with a time position on a first timeline. A needed image frame is selected, the needed image frame associated with a second time position on a second timeline. The second time position is mapped on the second timeline to a first time position on the first timeline. The image frame server is requested to provide an image frame from the first sequence of image frames at the first time position on the first timeline.

主权项

1. A computer-implemented method to control sharing of image frames between first and second timelines, the method comprising:
sending a request for the designation of a memory region configured to receive image frames of a sequence of image frames from an image frame server, the memory region being different from memory regions containing the first and second timelines, each of the image frames in the sequence is associated with a time position on the first timeline associated with the image frame server; determining that one or more image frames of the sequence of image frames are to be used at a particular time position on the second timeline that is different from the first timeline; subsequent to sending the request for the designation of a memory region, sending a request for the image frame server to copy the one or more image frames into the memory region; and receiving the one or more image frames from the memory region.