marfrit/libva-v4l2-request-fourier
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Grab the base index when allocating buffers and mapping them

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Because there might be more than a single call to CreateSurfaces,
we cannot assume that the index relative to the number of surfaces
requested in a single call matches the v4l2 index.

Grab the base index (as returned by the kernel) when allocating
buffers and use it for memory mapping and addressing them in v4l2.
This avoids memory-mapping the first (index 0) buffer multiple times
in that scenario instead of the n-th allocated buffer (in the n-th
call in the sequence).

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
This commit is contained in:
Paul Kocialkowski
2018-07-20 13:48:51 +02:00
parent 3b0e7dbf12
commit c9327dd55a
4 changed files with 20 additions and 9 deletions
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src/v4l2.h
+1 -1
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@@ -37,7 +37,7 @@ int v4l2_get_format(int video_fd, unsigned int type, unsigned int *width,
unsigned int *height, unsigned int *bytesperline,
unsigned int *sizes, unsigned int *planes_count);
int v4l2_create_buffers(int video_fd, unsigned int type,
unsigned int buffers_count);
unsigned int buffers_count, unsigned int *index_base);
int v4l2_query_buffer(int video_fd, unsigned int type, unsigned int index,
unsigned int *lengths, unsigned int *offsets,
unsigned int buffers_count);