From 3994e7e9e476bc575b14a1b1705f1cfa65e1ae6c Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
Date: Fri, 3 Feb 2012 11:12:42 +0100
Subject: Preliminary support of streaming for the UFO camera

---
 NEWS              |  5 +++--
 src/cameras/ipe.c | 40 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index 5420ecf..b76512a 100644
--- a/NEWS
+++ b/NEWS
@@ -6,8 +6,9 @@ Changes in libuca 0.5.0
 
 - Adapt cameras/ipe.c to support the current driver API
 
-- uca_cam_grab_callback()s have to return UCA_BUFFER_KEEP or UCA_BUFFER_RELEASE
-  now
+- API changes
+    - new enum type uca_buffer_status
+    - uca_cam_grab_callback()s have to return uca_buffer_status
 
 - New symbols:
     - uca_cam_release_buffer()
diff --git a/src/cameras/ipe.c b/src/cameras/ipe.c
index 2c352bc..103d333 100644
--- a/src/cameras/ipe.c
+++ b/src/cameras/ipe.c
@@ -30,6 +30,13 @@
 
 static void uca_ipe_handle_error(const char *format, ...)
 {
+    if (format) {
+        va_list ap;
+        va_start(ap, format);
+        vprintf(format, ap);
+        printf("\n");
+        va_end(ap);
+    }
 }
 
 static uint32_t uca_ipe_set_property(struct uca_camera_priv *cam, enum uca_property_ids property, void *data)
@@ -127,7 +134,7 @@ static uint32_t uca_ipe_stop_recording(struct uca_camera_priv *cam)
 
 static uint32_t uca_ipe_grab(struct uca_camera_priv *cam, char *buffer, void *meta_data)
 {
-    pcilib_t *handle = cam->user;
+    pcilib_t *handle = GET_HANDLE(cam);
     size_t size = cam->frame_width * cam->frame_height * sizeof(uint16_t);
     void *data = NULL;
     pcilib_event_id_t event_id;
@@ -152,16 +159,43 @@ static uint32_t uca_ipe_grab(struct uca_camera_priv *cam, char *buffer, void *me
     return UCA_NO_ERROR;
 }
 
+static int event_callback(pcilib_event_id_t event_id, pcilib_event_info_t *info, void *user)
+{
+    struct uca_camera_priv *cam = (struct uca_camera_priv *) user;
+    pcilib_t *handle = GET_HANDLE(cam);
+    size_t error = 0;
+    void *buffer = pcilib_get_data(handle, event_id, PCILIB_EVENT_DATA, &error);
+
+    if (buffer == NULL)
+        return UCA_ERR_CAMERA | UCA_ERR_CALLBACK;
+
+    enum uca_buffer_status status = cam->callback(info->seqnum, buffer, NULL, cam->user);
+
+    if (status == UCA_BUFFER_RELEASE)
+        pcilib_return_data(handle, event_id, PCILIB_EVENT_DATA, buffer);
+
+    return UCA_NO_ERROR;
+}
+
 static uint32_t uca_ipe_register_callback(struct uca_camera_priv *cam, uca_cam_grab_callback cb, void *user)
 {
     if (cam->callback == NULL) {
         cam->callback = cb;
         cam->callback_user = user;
+        pcilib_stream(GET_HANDLE(cam), &event_callback, cam);
         return UCA_NO_ERROR;
     }
     return UCA_ERR_CAMERA | UCA_ERR_CALLBACK | UCA_ERR_ALREADY_REGISTERED;
 }
 
+static uint32_t uca_ipe_release_buffer(struct uca_camera_priv *cam, void *buffer)
+{
+    /* FIXME: call return_data */
+    /* pcilib_t *handle = GET_HANDLE(cam); */
+    /* pcilib_return_data(handle, event_id, PCILIB_EVENT_DATA, buffer); */
+    return UCA_NO_ERROR;
+}
+
 static uint32_t uca_ipe_destroy(struct uca_camera_priv *cam)
 {
     pcilib_close(GET_HANDLE(cam));
@@ -173,8 +207,7 @@ uint32_t uca_ipe_init(struct uca_camera_priv **cam, struct uca_grabber_priv *gra
     pcilib_model_t model = PCILIB_MODEL_DETECT;
     pcilib_set_error_handler(uca_ipe_handle_error, uca_ipe_handle_error);
     pcilib_t *handle = pcilib_open("/dev/fpga0", model);
-    /* XXX: This is not working because pcilib is still returning a valid
-     * structure although things like "failing ioctl's" can happen. */
+
     if (handle == NULL)
         return UCA_ERR_CAMERA | UCA_ERR_INIT | UCA_ERR_NOT_FOUND;
 
@@ -191,6 +224,7 @@ uint32_t uca_ipe_init(struct uca_camera_priv **cam, struct uca_grabber_priv *gra
     uca->stop_recording = &uca_ipe_stop_recording;
     uca->grab = &uca_ipe_grab;
     uca->register_callback = &uca_ipe_register_callback;
+    uca->release_buffer = &uca_ipe_release_buffer;
 
     uca->frame_width = 2048;
     uca->frame_height = 1088;
-- 
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