claude-noether/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/context.c
+7 -4
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@@ -57,6 +57,8 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
VAContextID id;
VAStatus status;
unsigned int pixelformat;
unsigned int index_base;
unsigned int index;
unsigned int i;
int rc;
@@ -103,7 +105,7 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
rc = v4l2_create_buffers(driver_data->video_fd,
V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
surfaces_count);
surfaces_count, &index_base);
if (rc < 0) {
status = VA_STATUS_ERROR_ALLOCATION_FAILED;
goto error;
@@ -123,6 +125,8 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
memcpy(ids, surfaces_ids, surfaces_count * sizeof(VASurfaceID));
for (i = 0; i < surfaces_count; i++) {
index = index_base + i;
surface_object = SURFACE(driver_data, surfaces_ids[i]);
if (surface_object == NULL) {
status = VA_STATUS_ERROR_INVALID_SURFACE;
@@ -130,7 +134,7 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
}
rc = v4l2_query_buffer(driver_data->video_fd,
V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, i,
V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE, index,
&length, &offset, 1);
if (rc < 0) {
status = VA_STATUS_ERROR_ALLOCATION_FAILED;
@@ -144,8 +148,7 @@ VAStatus RequestCreateContext(VADriverContextP context, VAConfigID config_id,
goto error;
}
surface_object->source_index = i;
surface_object->destination_index = i;
surface_object->source_index = index;
surface_object->source_data = source_data;
surface_object->source_size = length;
}