Prepare for frame grabber abstraction

12 files changed, 318 insertions, 223 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d319ac3..e863137 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,10 +3,12 @@ cmake_minimum_required(VERSION 2.8)
 # --- Set sources -------------------------------------------------------------
 set(uca_SRCS
     uca.c
+    uca-cam.c
     )
 
 set(uca_HDRS
     uca.h
+    uca-cam.h
     )
 
 set(uca_LIBS "")
@@ -21,32 +23,45 @@ find_package(PCO)
 find_package(FgLib5)
 find_package(ClSerMe4)
 
-# --- Add sources if camera access sources are available ----------------------
-if(PCO_FOUND AND CLSERME4_FOUND AND FGLIB5_FOUND)
+# --- Add sources if camera/framegrabber access sources are available ---------
+if(PCO_FOUND)
     set(HAVE_PCO_EDGE TRUE)
 
     set(uca_SRCS 
         ${uca_SRCS}
-        cameras/uca_pco.c
+        cameras/pco.c
         )
 
     set(uca_LIBS 
         ${uca_LIBS}
-        ${CLSERME4_LIBRARY}
-        ${FGLIB5_LIBRARY}
         ${PCO_LIBRARIES}
         )
 
     include_directories(
         ${CMAKE_CURRENT_SOURCE_DIR}
-        ${CLSERME4_INCLUDE_DIR}
-        ${FGLIB5_INCLUDE_DIR}
         ${PCO_INCLUDE_DIRS}
         )
 endif()
 
 if(CLSERME4_FOUND AND FGLIB5_FOUND)
-    set(HAVE_ME4_FRAMEGRABBER TRUE)
+    set(HAVE_ME4 TRUE)
+
+    set(uca_SRCS 
+        ${uca_SRCS}
+        grabbers/me4.c
+        )
+
+    set(uca_LIBS 
+        ${uca_LIBS}
+        ${CLSERME4_LIBRARY}
+        ${FGLIB5_LIBRARY}
+        )
+
+    include_directories(
+        ${CMAKE_CURRENT_SOURCE_DIR}
+        ${CLSERME4_INCLUDE_DIR}
+        ${FGLIB5_INCLUDE_DIR}
+        )
 endif()
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
diff --git a/src/cameras/uca_pco.c b/src/cameras/pco.c
index cd727b9..88f1e23 100644
--- a/src/cameras/uca_pco.c
+++ b/src/cameras/pco.c
@@ -6,7 +6,8 @@
 #include <fgrab_prototyp.h>
 #include <libpco/libpco.h>
 #include "uca.h"
-#include "uca_pco.h"
+#include "uca-cam.h"
+#include "pco.h"
 
 struct pco_cam_t {
     struct pco_edge_t *pco;
diff --git a/src/cameras/uca_pco.h b/src/cameras/pco.h
index 240e675..240e675 100644
--- a/src/cameras/uca_pco.h
+++ b/src/cameras/pco.h
diff --git a/src/config.h.in b/src/config.h.in
index 301b731..5bd20c1 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -1,5 +1,6 @@
 
-#cmakedefine HAVE_ME4_FRAMEGRABBER
+#cmakedefine HAVE_ME4
+
 #cmakedefine HAVE_PCO_EDGE
 #cmakedefine HAVE_PHOTON_FOCUS
 #cmakedefine HAVE_PHOTRON_FASTCAM
diff --git a/src/grabbers/me4.c b/src/grabbers/me4.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/grabbers/me4.c
diff --git a/src/grabbers/me4.h b/src/grabbers/me4.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/grabbers/me4.h
diff --git a/src/uca-cam.c b/src/uca-cam.c
new file mode 100644
index 0000000..a51a5ae
--- /dev/null
+++ b/src/uca-cam.c
@@ -0,0 +1,62 @@
+
+#include <stdlib.h>
+#include "uca.h"
+#include "uca-cam.h"
+
+enum uca_cam_state uca_get_camera_state(struct uca_camera_t *cam)
+{
+    return cam->state;
+}
+
+static struct uca_property_t property_map[UCA_PROP_LAST+1] = {
+    { "name",           uca_na,     uca_string }, 
+    { "width",          uca_pixel,  uca_uint32t }, 
+    { "width.min",      uca_pixel,  uca_uint32t }, 
+    { "width.max",      uca_pixel,  uca_uint32t }, 
+    { "height",         uca_pixel,  uca_uint32t }, 
+    { "height.min",     uca_pixel,  uca_uint32t }, 
+    { "height.max",     uca_pixel,  uca_uint32t }, 
+    { "offset.x",       uca_pixel,  uca_uint32t }, 
+    { "offset.y",       uca_pixel,  uca_uint32t }, 
+    { "bitdepth",       uca_bits,   uca_uint8t }, 
+    { "exposure",       uca_us,     uca_uint32t }, 
+    { "exposure.min",   uca_ns,     uca_uint32t }, 
+    { "exposure.max",   uca_ms,     uca_uint32t }, 
+    { "delay",          uca_us,     uca_uint32t }, 
+    { "delay.min",      uca_ns,     uca_uint32t }, 
+    { "delay.max",      uca_ms,     uca_uint32t }, 
+    { "framerate",      uca_na,     uca_uint32t }, 
+    { "triggermode",    uca_na,     uca_uint32t }, 
+    { "timestampmode",  uca_na,     uca_uint32t }, 
+    { "scan-mode",      uca_na,     uca_uint32t }, 
+    { "interlace.samplerate", uca_na, uca_uint32t }, 
+    { "interlace.threshold.pixel", uca_na, uca_uint32t }, 
+    { "interlace.threshold.row", uca_na, uca_uint32t }, 
+    { "correctionmode", uca_na, uca_uint32t }, 
+    { NULL, 0, 0 }
+};
+
+enum uca_property_ids uca_get_property_id(const char *property_name)
+{
+    char *name;
+    int i = 0;
+    while (property_map[i].name != NULL) {
+        if (!strcmp(property_map[i].name, property_name))
+            return i;
+        i++;
+    }
+    return UCA_ERR_PROP_INVALID;
+}
+
+struct uca_property_t *uca_get_full_property(enum uca_property_ids property_id)
+{
+    if ((property_id >= 0) && (property_id < UCA_PROP_LAST))
+        return &property_map[property_id];
+    return NULL;
+}
+
+const char* uca_get_property_name(enum uca_property_ids property_id)
+{
+    if ((property_id >= 0) && (property_id < UCA_PROP_LAST))
+        return property_map[property_id].name;
+}
diff --git a/src/uca-cam.h b/src/uca-cam.h
new file mode 100644
index 0000000..99ed5f2
--- /dev/null
+++ b/src/uca-cam.h
@@ -0,0 +1,172 @@
+#ifndef __UNIFIED_CAMERA_ACCESS_CAM_H
+#define __UNIFIED_CAMERA_ACCESS_CAM_H
+
+#include <stdint.h>
+
+struct uca_camera_t;
+struct uca_property_t;
+
+enum uca_property_ids;
+
+/*
+ * --- non-virtual methods ----------------------------------------------------
+ */
+enum uca_cam_state uca_get_camera_state(struct uca_camera_t *cam);
+
+
+/*
+ * --- virtual methods --------------------------------------------------------
+ */
+
+/**
+ * \brief Camera probing and initialization
+ * \return UCA_ERR_INIT_NOT_FOUND if camera is not found or could not be initialized
+ */
+typedef uint32_t (*uca_cam_init) (struct uca_camera_t **cam);
+
+/**
+ * \brief Free camera resouces
+ */
+typedef uint32_t (*uca_cam_destroy) (struct uca_camera_t *cam);
+
+/**
+ * \brief Set a property
+ * \param[in] property_name Name of the property as defined in XXX
+ * \return UCA_ERR_PROP_INVALID if property is not supported on the camera or
+ * UCA_ERR_PROP_VALUE_OUT_OF_RANGE if value cannot be set.
+ */
+typedef uint32_t (*uca_cam_set_property) (struct uca_camera_t *cam, enum uca_property_ids property, void *data);
+
+/**
+ * \brief Set a property
+ * \param[in] property_name Name of the property as defined in XXX
+ * \return UCA_ERR_PROP_INVALID if property is not supported on the camera
+ */
+typedef uint32_t (*uca_cam_get_property) (struct uca_camera_t *cam, enum uca_property_ids property, void *data);
+
+/** \brief Allocate number of buffers
+ *
+ * The size of each buffer is width x height x bits
+ */
+typedef uint32_t (*uca_cam_alloc) (struct uca_camera_t *cam, uint32_t n_buffers);
+
+/**
+ * \brief Acquire one frame
+ */
+typedef uint32_t (*uca_cam_acquire_image) (struct uca_camera_t *cam, void *buffer);
+
+/**
+ * \brief Convert a property string to the corresponding ID
+ */
+enum uca_property_ids uca_get_property_id(const char *property_name);
+
+/**
+ * \brief Convert a property ID to the corresponding string 
+ */
+const char* uca_get_property_name(enum uca_property_ids property_id);
+
+/**
+ * \brief Return the full property structure for a given ID
+ */
+struct uca_property_t *uca_get_full_property(enum uca_property_ids property_id);
+
+
+/* The property IDs must start with 0 and must be continuous. Whenever this
+ * library is released, the IDs must not change to guarantee binary compatibility! */
+enum uca_property_ids {
+    UCA_PROP_NAME = 0,
+    UCA_PROP_WIDTH,
+    UCA_PROP_WIDTH_MIN,
+    UCA_PROP_WIDTH_MAX,
+    UCA_PROP_HEIGHT,
+    UCA_PROP_HEIGHT_MIN,
+    UCA_PROP_HEIGHT_MAX,
+    UCA_PROP_X_OFFSET,
+    UCA_PROP_Y_OFFSET,
+    UCA_PROP_BITDEPTH,
+    UCA_PROP_EXPOSURE,
+    UCA_PROP_EXPOSURE_MIN,
+    UCA_PROP_EXPOSURE_MAX,
+    UCA_PROP_DELAY,
+    UCA_PROP_DELAY_MIN,
+    UCA_PROP_DELAY_MAX,
+    UCA_PROP_FRAMERATE,
+    UCA_PROP_TRIGGER_MODE,
+
+    /* pco.edge specific */
+    UCA_PROP_TIMESTAMP_MODE,
+    UCA_PROP_SCAN_MODE,
+
+    /* IPE camera specific */
+    UCA_PROP_INTERLACE_SAMPLE_RATE,
+    UCA_PROP_INTERLACE_PIXEL_THRESH,
+    UCA_PROP_INTERLACE_ROW_THRESH,
+
+    /* Photon Focus specific */
+    UCA_PROP_CORRECTION_MODE,
+
+    UCA_PROP_LAST
+};
+
+/* Possible timestamp modes for UCA_PROP_TIMESTAMP_MODE */
+#define UCA_TIMESTAMP_ASCII     0x01
+#define UCA_TIMESTAMP_BINARY    0x02
+
+/* Trigger mode for UCA_PROP_TRIGGERMODE */
+#define UCA_TRIGGER_AUTO        1
+#define UCA_TRIGGER_INTERNAL    2
+#define UCA_TRIGGER_EXTERNAL    3
+
+/* Correction modes for UCA_PROP_CORRECTION_MODE */
+#define UCA_CORRECT_OFFSET      0x01
+#define UCA_CORRECT_HOTPIXEL    0x02
+#define UCA_CORRECT_GAIN        0x04
+
+/**
+ * \brief Describe a camera property
+ */
+struct uca_property_t {
+    const char *name;
+
+    enum uca_unit {
+        uca_pixel,
+        uca_bits,
+        uca_ns,
+        uca_us,
+        uca_ms,
+        uca_s,
+        uca_rows,
+        uca_na
+    } unit;
+
+    enum uca_types {
+        uca_uint32t,
+        uca_uint8t,
+        uca_string
+    } type;
+};
+
+enum uca_cam_state {
+    UCA_CAM_ERROR,
+    UCA_CAM_CONFIGURABLE,
+    UCA_CAM_ARMED,
+    UCA_CAM_RECORDING,
+};
+
+struct uca_camera_t {
+    struct uca_camera_t     *next;
+
+    /* Function pointers to camera-specific methods */
+    uca_cam_set_property    set_property;
+    uca_cam_get_property    get_property;
+    uca_cam_acquire_image   acquire_image;
+    uca_cam_alloc           alloc;
+
+    /* Private */
+    uca_cam_destroy         destroy;
+    enum uca_cam_state      state;
+
+    void *user; /**< private user data to be used by the camera driver */
+};
+
+#endif
diff --git a/src/uca-grabber.c b/src/uca-grabber.c
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/uca-grabber.c
diff --git a/src/uca-grabber.h b/src/uca-grabber.h
new file mode 100644
index 0000000..b01f453
--- /dev/null
+++ b/src/uca-grabber.h
@@ -0,0 +1,46 @@
+#ifndef __UNIFIED_CAMERA_ACCESS_GRABBER_H
+#define __UNIFIED_CAMERA_ACCESS_GRABBER_H
+
+/*
+ * --- virtual methods --------------------------------------------------------
+ */
+
+/**
+ * \brief Camera probing and initialization
+ * \return UCA_ERR_INIT_NOT_FOUND if camera is not found or could not be initialized
+ */
+typedef uint32_t (*uca_grabber_init) (struct uca_grabber_t **grabber);
+
+/**
+ * \brief Free camera resouces
+ */
+typedef uint32_t (*uca_grabber_destroy) (struct uca_grabber_t *grabber);
+
+/**
+ * \brief Set a property
+ * \param[in] property_name Name of the property as defined in XXX
+ * \return UCA_ERR_PROP_INVALID if property is not supported on the camera or
+ * UCA_ERR_PROP_VALUE_OUT_OF_RANGE if value cannot be set.
+ */
+typedef uint32_t (*uca_grabber_set_property) (struct uca_grabber_t *grabber, enum uca_property_ids property, void *data);
+
+/**
+ * \brief Set a property
+ * \param[in] property_name Name of the property as defined in XXX
+ * \return UCA_ERR_PROP_INVALID if property is not supported on the camera
+ */
+typedef uint32_t (*uca_grabber_get_property) (struct uca_grabber_t *grabber, enum uca_property_ids property, void *data);
+
+
+struct uca_grabber_t {
+    struct uca_grabber_t    *next;
+
+    /* Function pointers to grabber-specific methods */
+    uca_grabber_set_property set_property;
+    uca_grabber_get_property get_property;
+
+    /* Private */
+    void *user;
+};
+
+#endif
diff --git a/src/uca.c b/src/uca.c
index f86864c..1d0a515 100644
--- a/src/uca.c
+++ b/src/uca.c
@@ -2,21 +2,27 @@
 
 #include "config.h"
 #include "uca.h"
+#include "uca-cam.h"
+#include "uca-grabber.h"
+
+#ifdef HAVE_ME4
+#include "grabbers/me4.h"
+#endif
 
 #ifdef HAVE_PCO_EDGE
-#include "cameras/uca_pco.h"
+#include "cameras/pco.h"
 #endif
 
 #ifdef HAVE_PHOTON_FOCUS
-#include "cameras/uca_pf.h"
+#include "cameras/pf.h"
 #endif
 
 #ifdef HAVE_IPE_CAM
-#include "cameras/uca_ipe.h"
+#include "cameras/ipe.h"
 #endif
 
 #ifdef HAVE_PHOTRON_FASTCAM
-#include "cameras/uca_photron.h"
+#include "cameras/photron.h"
 #endif
 
 
@@ -79,60 +85,3 @@ void uca_destroy(struct uca_t *uca)
     }
 }
 
-enum uca_cam_state uca_get_camera_state(struct uca_camera_t *cam)
-{
-    return cam->state;
-}
-
-static struct uca_property_t property_map[UCA_PROP_LAST+1] = {
-    { "name",           uca_na,     uca_string }, 
-    { "width",          uca_pixel,  uca_uint32t }, 
-    { "width.min",      uca_pixel,  uca_uint32t }, 
-    { "width.max",      uca_pixel,  uca_uint32t }, 
-    { "height",         uca_pixel,  uca_uint32t }, 
-    { "height.min",     uca_pixel,  uca_uint32t }, 
-    { "height.max",     uca_pixel,  uca_uint32t }, 
-    { "offset.x",       uca_pixel,  uca_uint32t }, 
-    { "offset.y",       uca_pixel,  uca_uint32t }, 
-    { "bitdepth",       uca_bits,   uca_uint8t }, 
-    { "exposure",       uca_us,     uca_uint32t }, 
-    { "exposure.min",   uca_ns,     uca_uint32t }, 
-    { "exposure.max",   uca_ms,     uca_uint32t }, 
-    { "delay",          uca_us,     uca_uint32t }, 
-    { "delay.min",      uca_ns,     uca_uint32t }, 
-    { "delay.max",      uca_ms,     uca_uint32t }, 
-    { "framerate",      uca_na,     uca_uint32t }, 
-    { "triggermode",    uca_na,     uca_uint32t }, 
-    { "timestampmode",  uca_na,     uca_uint32t }, 
-    { "scan-mode",      uca_na,     uca_uint32t }, 
-    { "interlace.samplerate", uca_na, uca_uint32t }, 
-    { "interlace.threshold.pixel", uca_na, uca_uint32t }, 
-    { "interlace.threshold.row", uca_na, uca_uint32t }, 
-    { "correctionmode", uca_na, uca_uint32t }, 
-    { NULL, 0, 0 }
-};
-
-enum uca_property_ids uca_get_property_id(const char *property_name)
-{
-    char *name;
-    int i = 0;
-    while (property_map[i].name != NULL) {
-        if (!strcmp(property_map[i].name, property_name))
-            return i;
-        i++;
-    }
-    return UCA_ERR_PROP_INVALID;
-}
-
-struct uca_property_t *uca_get_full_property(enum uca_property_ids property_id)
-{
-    if ((property_id >= 0) && (property_id < UCA_PROP_LAST))
-        return &property_map[property_id];
-    return NULL;
-}
-
-const char* uca_get_property_name(enum uca_property_ids property_id)
-{
-    if ((property_id >= 0) && (property_id < UCA_PROP_LAST))
-        return property_map[property_id].name;
-}
diff --git a/src/uca.h b/src/uca.h
index 4034457..206aaec 100644
--- a/src/uca.h
+++ b/src/uca.h
@@ -11,52 +11,10 @@
  * to their respective implementation.
  */
 
-#include <stdint.h>
-
 struct uca_t;
 struct uca_camera_t;
 struct uca_property_t;
 
-enum uca_camera_state;
-enum uca_property_ids;
-
-/**
- * \brief Camera probing and initialization
- * \return UCA_ERR_INIT_NOT_FOUND if camera is not found or could not be initialized
- */
-typedef uint32_t (*uca_cam_init) (struct uca_camera_t **cam);
-
-/**
- * \brief Free camera resouces
- */
-typedef uint32_t (*uca_cam_destroy) (struct uca_camera_t *cam);
-
-/**
- * \brief Set a property
- * \param[in] property_name Name of the property as defined in XXX
- * \return UCA_ERR_PROP_INVALID if property is not supported on the camera or
- * UCA_ERR_PROP_VALUE_OUT_OF_RANGE if value cannot be set.
- */
-typedef uint32_t (*uca_cam_set_property) (struct uca_camera_t *cam, enum uca_property_ids property, void *data);
-
-/**
- * \brief Set a property
- * \param[in] property_name Name of the property as defined in XXX
- * \return UCA_ERR_PROP_INVALID if property is not supported on the camera
- */
-typedef uint32_t (*uca_cam_get_property) (struct uca_camera_t *cam, enum uca_property_ids property, void *data);
-
-/** \brief Allocate number of buffers
- *
- * The size of each buffer is width x height x bits
- */
-typedef uint32_t (*uca_cam_alloc) (struct uca_camera_t *cam, uint32_t n_buffers);
-
-/**
- * \brief Acquire one frame
- */
-typedef uint32_t (*uca_cam_acquire_image) (struct uca_camera_t *cam, void *buffer);
-
 /**
  * \brief Initialize the unified camera access interface
  * \return Pointer to a uca_t structure
@@ -68,20 +26,6 @@ struct uca_t *uca_init(void);
  */
 void uca_destroy(struct uca_t *uca);
 
-enum uca_cam_state uca_get_camera_state(struct uca_camera_t *cam);
-
-
-/**
- * \brief Convert a property string to the corresponding ID
- */
-enum uca_property_ids uca_get_property_id(const char *property_name);
-
-/**
- * \brief Convert a property ID to the corresponding string 
- */
-const char* uca_get_property_name(enum uca_property_ids property_id);
-
-struct uca_property_t *uca_get_full_property(enum uca_property_ids property_id);
 
 #define UCA_NO_ERROR                    0
 #define UCA_ERR_INIT_NOT_FOUND          1   /**< camera probing or initialization failed */
@@ -89,104 +33,9 @@ struct uca_property_t *uca_get_full_property(enum uca_property_ids property_id);
 #define UCA_ERR_PROP_GENERAL            3   /**< error occured reading/writing the property */
 #define UCA_ERR_PROP_VALUE_OUT_OF_RANGE 4   /**< error occured writing the property */
 
-
-/* The property IDs must start with 0 and must be continuous. Whenever this
- * library is released, the IDs must not change to guarantee binary compatibility! */
-enum uca_property_ids {
-    UCA_PROP_NAME = 0,
-    UCA_PROP_WIDTH,
-    UCA_PROP_WIDTH_MIN,
-    UCA_PROP_WIDTH_MAX,
-    UCA_PROP_HEIGHT,
-    UCA_PROP_HEIGHT_MIN,
-    UCA_PROP_HEIGHT_MAX,
-    UCA_PROP_X_OFFSET,
-    UCA_PROP_Y_OFFSET,
-    UCA_PROP_BITDEPTH,
-    UCA_PROP_EXPOSURE,
-    UCA_PROP_EXPOSURE_MIN,
-    UCA_PROP_EXPOSURE_MAX,
-    UCA_PROP_DELAY,
-    UCA_PROP_DELAY_MIN,
-    UCA_PROP_DELAY_MAX,
-    UCA_PROP_FRAMERATE,
-    UCA_PROP_TRIGGER_MODE,
-
-    /* pco.edge specific */
-    UCA_PROP_TIMESTAMP_MODE,
-    UCA_PROP_SCAN_MODE,
-
-    /* IPE camera specific */
-    UCA_PROP_INTERLACE_SAMPLE_RATE,
-    UCA_PROP_INTERLACE_PIXEL_THRESH,
-    UCA_PROP_INTERLACE_ROW_THRESH,
-
-    /* Photon Focus specific */
-    UCA_PROP_CORRECTION_MODE,
-
-    UCA_PROP_LAST
-};
-
-/* Possible timestamp modes for UCA_PROP_TIMESTAMP_MODE */
-#define UCA_TIMESTAMP_ASCII     0x01
-#define UCA_TIMESTAMP_BINARY    0x02
-
-/* Trigger mode for UCA_PROP_TRIGGERMODE */
-#define UCA_TRIGGER_AUTO        1
-#define UCA_TRIGGER_INTERNAL    2
-#define UCA_TRIGGER_EXTERNAL    3
-
-/* Correction modes for UCA_PROP_CORRECTION_MODE */
-#define UCA_CORRECT_OFFSET      0x01
-#define UCA_CORRECT_HOTPIXEL    0x02
-#define UCA_CORRECT_GAIN        0x04
-
-struct uca_property_t {
-    const char *name;
-
-    enum uca_unit {
-        uca_pixel,
-        uca_bits,
-        uca_ns,
-        uca_us,
-        uca_ms,
-        uca_s,
-        uca_rows,
-        uca_na
-    } unit;
-
-    enum uca_types {
-        uca_uint32t,
-        uca_uint8t,
-        uca_string
-    } type;
-};
-
-enum uca_cam_state {
-    UCA_CAM_ERROR,
-    UCA_CAM_CONFIGURABLE,
-    UCA_CAM_ARMED,
-    UCA_CAM_RECORDING,
-};
-
-struct uca_camera_t {
-    struct uca_camera_t     *next;
-
-    /* Function pointers to camera-specific methods */
-    uca_cam_set_property    set_property;
-    uca_cam_get_property    get_property;
-    uca_cam_acquire_image   acquire_image;
-    uca_cam_alloc           alloc;
-
-    /* Private */
-    uca_cam_destroy         destroy;
-    enum uca_cam_state      state;
-
-    void *user; /**< private user data to be used by the camera driver */
-};
-
 struct uca_t {
     struct uca_camera_t *cameras;
+    struct uca_grabber_t *grabbers;
 };