Gstreamer v4l2src: Failed to allocate required memory

[Andrea]

Hi,
I'm writing a v4l2 driver but I've some problems when is used by gstreamer
pipeline. I've implemented theese ioctl operations:

vidioc_querycap
vidioc_s_fmt_vid_cap
vidioc_try_fmt_vid_cap
vidioc_enum_frameintervals
vidioc_enum_framesizes
vidioc_enum_input
vidioc_enum_fmt_vid_cap
When I run the gstreamer pipeline (gst-launch-1.0 v4l2src !
video/x-raw,format=RGB,width=4096,height=2160,framerate=60/1 ! fakesink) I
receive this error:

/*ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Failed to
allocate required memory.
Additional debug info:
../../../git/sys/v4l2/gstv4l2src.c(555): gst_v4l2src_decide_allocation ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Buffer pool activation failed*/

This is some of the debug output from gstreamer:
/*
DEBUG                   v4l2
gstv4l2object.c:2858:gst_v4l2_object_setup_pool:<v4l2src0> initializing the
capture system
INFO                    v4l2
gstv4l2object.c:2882:gst_v4l2_object_setup_pool:<v4l2src0> accessing buffers
via mode 1
LOG                     v4l2
gstv4l2object.c:2891:gst_v4l2_object_setup_pool:<v4l2src0> initiating buffer
pool
DEBUG                   v4l2
gstv4l2object.c:4035:gst_v4l2_object_decide_allocation:<v4l2src0> decide
allocation
DEBUG                   v4l2
gstv4l2object.c:4061:gst_v4l2_object_decide_allocation:<v4l2src0>
allocation: size:0 min:0 max:0 pool:(NULL)
DEBUG                   v4l2
gstv4l2object.c:4088:gst_v4l2_object_decide_allocation:<v4l2src0> read/write
mode: no downstream pool, using our own
DEBUG                   v4l2
gstv4l2object.c:4195:gst_v4l2_object_decide_allocation:<v4l2src0> setting
own pool config to GstBufferPoolConfig, caps=(GstCaps)"video/x-raw\,\
format\=\(string\)RGB\,\ width\=\(int\)4096\,\ height\=\(int\)2160\,\
framerate\=\(fraction\)60/1\,\ pixel-aspect-ratio\=\(fraction\)1/1\,\
interlace-mode\=\(string\)progressive", size=(uint)26542080,
min-buffers=(uint)4, max-buffers=(uint)0, allocator=(GstAllocator)"NULL",
params=(GstAllocationParams)NULL;
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Failed to
allocate required memory.
Additional debug info:
../../../git/sys/v4l2/gstv4l2src.c(555): gst_v4l2src_decide_allocation ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Buffer pool activation failed
Execution ended after 0:00:00.410428919
Setting pipeline to PAUSED ...
LOG                     v4l2
gstv4l2object.c:3913:gst_v4l2_object_unlock:<v4l2src0> start flushing
Setting pipeline to READY ...
LOG                     v4l2
gstv4l2object.c:3913:gst_v4l2_object_unlock:<v4l2src0> start flushing
LOG                     v4l2
gstv4l2object.c:3926:gst_v4l2_object_unlock_stop:<v4l2src0> stop flushing
DEBUG                   v4l2
gstv4l2object.c:3937:gst_v4l2_object_stop:<v4l2src0> stopping
DEBUG                   v4l2
gstv4l2object.c:3945:gst_v4l2_object_stop:<v4l2src0> deactivating pool
Setting pipeline to NULL ...
DEBUG                   v4l2 v4l2_calls.c:719:gst_v4l2_close:<v4l2src0>
Trying to close /dev/video0
DEBUG                   v4l2
v4l2_calls.c:464:gst_v4l2_empty_lists:<v4l2src0> deleting enumerations
Freeing pipeline ...*/

I can't find the cause of the error, maybe I forgot an ioctl operation?

Thank you



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