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v4l2object: auto-detect dmabuf export for V4L2_IO_AUTO on capture side

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Issue an invalid VIDIOC_EXPBUF ioctl to the driver to check if the
driver supports dmabuf export. If the driver does not implement the
IOCTL, the error is ENOTTY. Any other error codes mean that the driver
implements VIDIOC_EXPBUF.

https://bugzilla.gnome.org/show_bug.cgi?id=779466
This commit is contained in:
Enrico Jorns 2017-09-29 22:19:42 -04:00 committed by Nicolas Dufresne
parent 986f3e15b2
commit e9c00c083b
1 changed files with 28 additions and 2 deletions
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30
sys/v4l2/gstv4l2object.c
View file

@ -37,6 +37,7 @@
#include <gudev/gudev.h>
#endif
#include "ext/videodev2.h"
#include "gstv4l2object.h"
#include "gstv4l2tuner.h"
#include "gstv4l2colorbalance.h"
@ -2851,6 +2852,25 @@ error:
return ret;
}
static gboolean
gst_v4l2_object_is_dmabuf_supported (GstV4l2Object * v4l2object)
{
gboolean ret = TRUE;
struct v4l2_exportbuffer expbuf = {
.type = v4l2object->type,
.index = -1,
.plane = -1,
.flags = O_CLOEXEC | O_RDWR,
};
/* Expected to fail, but ENOTTY tells us that it is not implemented. */
v4l2_ioctl (v4l2object->video_fd, VIDIOC_EXPBUF, &expbuf);
if (errno == -ENOTTY)
ret = FALSE;
return ret;
}
static gboolean
gst_v4l2_object_setup_pool (GstV4l2Object * v4l2object, GstCaps * caps)
{
@ -2872,8 +2892,14 @@ gst_v4l2_object_setup_pool (GstV4l2Object * v4l2object, GstCaps * caps)
goto method_not_supported;
if (v4l2object->device_caps & V4L2_CAP_STREAMING) {
if (v4l2object->req_mode == GST_V4L2_IO_AUTO)
mode = GST_V4L2_IO_MMAP;
if (v4l2object->req_mode == GST_V4L2_IO_AUTO) {
if (!V4L2_TYPE_IS_OUTPUT (v4l2object->type) &&
gst_v4l2_object_is_dmabuf_supported (v4l2object)) {
mode = GST_V4L2_IO_DMABUF;
} else {
mode = GST_V4L2_IO_MMAP;
}
}
} else if (v4l2object->req_mode == GST_V4L2_IO_MMAP)
goto method_not_supported;