[Bug 751241] vtdec: handle non-consecutive GstBuffer input without copying

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751241

Ilya Konstantinov <ilya.konstantinov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|gstreamer-bugs at lists.freede |ilya.konstantinov at gmail.com
                   |sktop.org                   |

--- Comment #1 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
Created attachment 306272
  --> https://bugzilla.gnome.org/attachment.cgi?id=306272&action=edit
vtdec: handle non-consecutive GstBuffer input without copying

This patch implements non-contiguous CMBlockBuffers.

In the process, I've realised we were using CMBlockBufferCreateWithMemoryBlock
improperly. It does NOT copy its input buffer, so gst_buffer_unmap-ing
immediately is incorrect. In the new implementation, its the CMBlockBuffer's
responsibility to unmap.

P.S. Once bug 747707 lands, I think cm_block_buffer_from_gst_buffer should move
into the library.

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