From 2de85655bd50cfcd2a21267ecf4e5f91b0800a9c Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@ipe.fzk.de>
Date: Wed, 16 Mar 2011 10:15:15 +0100
Subject: Implement grab callback for Silicon Software me4

---
 src/grabbers/me4.c | 39 +++++++++++++++++++++++++++++++--------
 src/uca-grabber.h  |  3 ++-
 src/uca.h          |  4 +++-
 3 files changed, 36 insertions(+), 10 deletions(-)

(limited to 'src')

diff --git a/src/grabbers/me4.c b/src/grabbers/me4.c
index d6419e0..7bb687b 100644
--- a/src/grabbers/me4.c
+++ b/src/grabbers/me4.c
@@ -8,9 +8,10 @@
 #include "uca.h"
 #include "uca-grabber.h"
 
-struct uca_me4_grabber_t {
+struct fg_apc_data {
     Fg_Struct   *fg;
     dma_mem     *mem;
+    uca_grabber_grab_callback cb;
 };
 
 struct uca_sisofg_map_t {
@@ -39,8 +40,8 @@ static struct uca_sisofg_map_t uca_to_fg[] = {
     { UCA_GRABBER_INVALID,          0,                      false }
 };
 
-#define GET_FG(grabber) (((struct uca_me4_grabber_t *) grabber->user)->fg)
-#define GET_MEM(grabber) (((struct uca_me4_grabber_t *) grabber->user)->mem)
+#define GET_FG(grabber) (((struct fg_apc_data *) grabber->user)->fg)
+#define GET_MEM(grabber) (((struct fg_apc_data *) grabber->user)->mem)
 
 uint32_t uca_me4_destroy(struct uca_grabber_t *grabber)
 {
@@ -103,7 +104,7 @@ uint32_t uca_me4_alloc(struct uca_grabber_t *grabber, uint32_t pixel_size, uint3
 
     dma_mem *mem = Fg_AllocMemEx(GET_FG(grabber), n_buffers*width*height*pixel_size, n_buffers);
     if (mem != NULL) {
-        ((struct uca_me4_grabber_t *) grabber->user)->mem = mem;
+        ((struct fg_apc_data *) grabber->user)->mem = mem;
         return UCA_NO_ERROR;
     }
     return UCA_ERR_PROP_GENERAL;
@@ -145,11 +146,31 @@ uint32_t uca_me4_grab(struct uca_grabber_t *grabber, void **buffer)
     return UCA_NO_ERROR;
 }
 
+static int uca_me4_callback(frameindex_t frame, struct fg_apc_data *apc)
+{
+    apc->cb(frame, Fg_getImagePtr(apc->fg, frame, PORT_A));
+    return 0;
+}
+
 uint32_t uca_me4_register_callback(struct uca_grabber_t *grabber, uca_grabber_grab_callback cb)
 {
-    grabber->callback = cb;
+    if (grabber->callback == NULL) {
+        grabber->callback = cb;
+        ((struct fg_apc_data *) grabber->user)->cb = cb;
+
+        struct FgApcControl ctrl;
+        ctrl.version = 0;
+        ctrl.data = (struct fg_apc_data *) grabber->user;
+        ctrl.func = &uca_me4_callback;
+        ctrl.flags = FG_APC_DEFAULTS;
+        ctrl.timeout = 1;
+
+        if (Fg_registerApcHandler(GET_FG(grabber), PORT_A, &ctrl, FG_APC_CONTROL_BASIC) != FG_OK)
+            return UCA_ERR_GRABBER_CALLBACK_REGISTRATION_FAILED;
+    }
+    else
+        return UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED;
 
-    /* TODO: add me4 registerApc stuff */
     return UCA_NO_ERROR;
 }
 
@@ -160,10 +181,12 @@ uint32_t uca_me4_init(struct uca_grabber_t **grabber)
         return UCA_ERR_GRABBER_NOT_FOUND;
 
     struct uca_grabber_t *uca = (struct uca_grabber_t *) malloc(sizeof(struct uca_grabber_t));
-    struct uca_me4_grabber_t *me4 = (struct uca_me4_grabber_t *) malloc(sizeof(struct uca_me4_grabber_t));
+    struct fg_apc_data *me4 = (struct fg_apc_data *) malloc(sizeof(struct fg_apc_data));
 
-    me4->fg = fg;
+    me4->fg  = fg;
     me4->mem = NULL;
+    me4->cb  = NULL;
+
     uca->user = me4;
     uca->destroy = &uca_me4_destroy;
     uca->set_property = &uca_me4_set_property;
diff --git a/src/uca-grabber.h b/src/uca-grabber.h
index f29b950..a10d463 100644
--- a/src/uca-grabber.h
+++ b/src/uca-grabber.h
@@ -110,7 +110,8 @@ typedef uint32_t (*uca_grabber_grab) (struct uca_grabber_t *grabber, void **buff
 typedef void (*uca_grabber_grab_callback) (uint32_t image_number, void *buffer);
 
 /**
- * Register callback for given frame grabber.
+ * Register callback for given frame grabber. To actually start receiving
+ * frames, call uca_grabber_acquire().
  *
  * \param[in] grabber The grabber for which the callback should be installed
  *
diff --git a/src/uca.h b/src/uca.h
index 06904bc..1ae371a 100644
--- a/src/uca.h
+++ b/src/uca.h
@@ -245,7 +245,9 @@ enum uca_errors {
     UCA_ERR_CAM_RECORD,                 /**< could not record */
 
     UCA_ERR_GRABBER_ACQUIRE,            /**< grabber couldn't acquire a frame */
-    UCA_ERR_GRABBER_NOMEM               /**< no memory was allocated using uca_grabber->alloc() */
+    UCA_ERR_GRABBER_NOMEM,               /**< no memory was allocated using uca_grabber->alloc() */
+    UCA_ERR_GRABBER_CALLBACK_REGISTRATION_FAILED,
+    UCA_ERR_GRABBER_CALLBACK_ALREADY_REGISTERED
 };
 
 /**
-- 
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