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If a buffer is made up of non-contiguous `GstMemory`s `gst_buffer_map` has to copy all the data into a new `GstMemory` which is contiguous. By mapping all the `GstMemory`s individually and then using scatter-gather IO we avoid this situation. This is a preparatory step for adding support to multisocketsink for sending file descriptors, where a GstBuffer may be made up of several `GstMemory`s, some of which are backed by a memfd or file, but I think this patch is valid and useful on its own. Fixes https://bugzilla.gnome.org/show_bug.cgi?id=746150 |
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