Problems with Camera Allied Vision ALVIUM 1800 U-052m

[rrrossi]

bug description: The program arv-viewer-0.8 recognize the Allied Vision ALVIUM 1800 U-052m camera, and can open it, however no frame is acquired. The program arv-test-0.8 with the option -d all shows the following error: stream> Failed to enable stream (USB3Vision write_memory error (si-registers-inconsistent))

Steps to reproduce the behavior:

Connect the camera to the USB, start the arv-viewer-0.8, select the camera, start video acquisition.

or

arv-camera-test-0.8 -d all

Expected behavior: No error in arv-camera-test-0.8 Video acquisition in arv-viewer-0.8

Camera description:

• Manufacturer: Allied Vision
• Model : ALVIUM 1800 U-052m
• Interface: USB3

Platform description:

• Aravis version: 0.8.30 - git ea0316d070929f19629a722e84a9153591b75490
• OS: Manjaro Linux (current)
• Hardware: x86_64

---

After short discussion in the Forum, made a wireshark dump of the traffic on the USB bus when performing acquisition with a simple demo program. The demo program simply enumerates the cameras, open the first (and only) one, and then start acquisition. Frame rate was set very low, so that only 3 frames are acquired.

Attached is the USB dump

AV-1800U-052m-dump.pcapng.gz

[EmmanuelP]

Thanks for the report. Could you also attach the wireshark capture of ./tests/arv-acquisition-test ? Preferably with the console output obtained with ARV_DEBUG=all.

[rrrossi]

Here are the files.

output-arv-acquisition-60Hz_FrameRate.txt.gz AV-1800U-052m-dump-while-arv-acquisition-test-60Hz_FrameRate.pcapng.gz

[rrrossi]

I also have an update: Acquisition consistently does not work also on Windows. However, results of arv-test-0.8 are slightly different: After each stream-thread> Start async USB3Vision stream thread on Linux I get stream> Failed to enable stream (USB3Vision write_memory error (si-registers-inconsistent)) on Windows I do not get the message, but all the tests fail anyway.

[EmmanuelP]

The problem lies in the payload_size computation, which is not aligned currently.

504	13.381753	4.6.1	host	U3V	80	< WRITEMEM_ACK U3V_STATUS_SI_PAYLOAD_SIZE_NOT_ALIGNED[SI_Payload_Transfer_Size]

The relevant code is here: https://github.com/AravisProject/aravis/blob/ea0316d070929f19629a722e84a9153591b75490/src/arvuvstream.c#L811C3-L830C24

I will try to have a look soon, but meanwhile you may want to fix the issue :)

A source of inspiration is the usb3vision code from NI here: https://github.com/ni/usb3vision/blob/a09d2150cb824d7a2f6085b00819e815b910a9c8/u3v_stream.c#L331-L450

[rrrossi]

One step forward, but help needed. According to my interpretation of the links you provided, I came out with this patch. arvuvstream.c.diff.gz

diff --git a/src/arvuvstream.c b/src/arvuvstream.c
index d8f3b4b3..d2cfecb2 100644
--- a/src/arvuvstream.c
+++ b/src/arvuvstream.c
@@ -824,10 +824,13 @@ arv_uv_stream_start_thread (ArvStream *stream)
         si_trailer_size = align (si_req_trailer_size, alignment);
     }
 
-	si_payload_size = MIN(si_req_payload_size , aligned_maximum_transfer_size);
-	si_payload_count=  si_req_payload_size / si_payload_size;
-	si_transfer1_size = align(si_req_payload_size % si_payload_size, alignment);
-	si_transfer2_size = 0;
+	guint64 image_bytes_left = si_req_payload_size;
+	si_payload_size = MIN(si_req_payload_size , aligned_maximum_transfer_size) / alignment * alignment;
+	si_payload_count =  si_req_payload_size / si_payload_size;
+	image_bytes_left -= si_payload_count * si_payload_size;
+	si_transfer1_size = align(image_bytes_left, alignment);
+	image_bytes_left -= si_transfer1_size;
+	si_transfer2_size = align(image_bytes_left, alignment);
 
     arv_device_write_memory (device, priv->sirm_address + ARV_SIRM_MAX_LEADER_SIZE,
                                  sizeof (si_leader_size), &si_leader_size, NULL);

The idea under the patch is:

si_req_payload_size should be the image data, that can be very big. si_payload_size should be the payload supported by each USB transfer, and have to be a multiple of alignment, and can't be bigger than aligned_maximum_transfer_size. si_payload_count is the number of full packets transferred on the USB remaining bytes are transferred with si_transfer1_size and si_transfer2_size.

Now arv-test-0.8 -d all pass successfully the acquisition tests, and stop with an error while checking chunks (but this is a different - probably similar - problem. ./tests/arv-acquisition-test succeed too.

./tests/arv-viewer-0.8 -d viewer:4 display only few frames. Most of the received frames are discarded. The messages are:

[12:47:27.757] 🅳 viewer> pop buffer (-1,1)
[12:47:27.757] 🅳 viewer> push discarded buffer: status=0

(status is the status of the new buffer)

removing the condition n_input_buffers + n_output_buffers > 0) { at line 439 of arvviewer.c, frames seems to be correctly shown, but this is clearly not the solution of the problem!