Optionally use libv4l to access v4l2 devices. Fixes bug #545033.

Original commit message from CVS:
Patch by: Bastien Nocera <hadess at hadess dot net>,
Hans de Goede <jwrdegoede at fedoraproject dot org>
* configure.ac:
* sys/v4l2/Makefile.am:
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_get_read):
* sys/v4l2/v4l2_calls.c: (gst_v4l2_get_capabilities),
(gst_v4l2_fill_lists), (gst_v4l2_open), (gst_v4l2_close),
(gst_v4l2_get_norm), (gst_v4l2_set_norm), (gst_v4l2_get_frequency),
(gst_v4l2_set_frequency), (gst_v4l2_signal_strength),
(gst_v4l2_get_attribute), (gst_v4l2_set_attribute),
(gst_v4l2_get_input), (gst_v4l2_set_input):
* sys/v4l2/v4l2_calls.h:
* sys/v4l2/v4l2src_calls.c: (gst_v4l2_buffer_finalize),
(gst_v4l2_buffer_new), (gst_v4l2_buffer_pool_finalize),
(gst_v4l2_buffer_pool_new), (gst_v4l2_buffer_pool_activate),
(gst_v4l2src_fill_format_list),
(gst_v4l2src_probe_caps_for_format_and_size),
(gst_v4l2src_probe_caps_for_format), (gst_v4l2src_grab_frame),
(gst_v4l2src_set_capture), (gst_v4l2src_capture_init),
(gst_v4l2src_capture_start), (gst_v4l2src_capture_stop),
(gst_v4l2src_get_nearest_size):
Optionally use libv4l to access v4l2 devices. Fixes bug #545033.

5 files changed, 72 insertions, 47 deletions

diff --git a/sys/v4l2/Makefile.am b/sys/v4l2/Makefile.am
index f6b50ed1..ed9c3ec3 100644
--- a/sys/v4l2/Makefile.am
+++ b/sys/v4l2/Makefile.am
@@ -22,8 +22,9 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
 libgstvideo4linux2_la_CFLAGS =   $(GST_PLUGINS_BASE_CFLAGS) \
 				 $(GST_BASE_CFLAGS) \
 				 $(GST_CFLAGS) \
-				 $(X_CFLAGS)
-			        
+				 $(X_CFLAGS) \
+				 $(LIBV4L2_CFLAGS)
+
 libgstvideo4linux2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgstvideo4linux2_la_LIBTOOLFLAGS = --tag=disable-static
 
@@ -31,7 +32,8 @@ libgstvideo4linux2_la_LIBADD =   $(GST_PLUGINS_BASE_LIBS) \
 				 $(GST_BASE_LIBS) \
 				 -lgstinterfaces-$(GST_MAJORMINOR) \
 				 $(GST_LIBS) \
-				 $(xv_libs)
+				 $(xv_libs) \
+				 $(LIBV4L2_LIBS)
 
 noinst_HEADERS = gstv4l2object.h v4l2_calls.h \
 		 gstv4l2src.h v4l2src_calls.h \
diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
index 7aed289b..f4e3ecb1 100644
--- a/sys/v4l2/gstv4l2src.c
+++ b/sys/v4l2/gstv4l2src.c
@@ -1194,7 +1194,7 @@ gst_v4l2src_get_read (GstV4l2Src * v4l2src, GstBuffer ** buf)
 
   do {
     amount =
-        read (v4l2src->v4l2object->video_fd, GST_BUFFER_DATA (*buf),
+        v4l2_read (v4l2src->v4l2object->video_fd, GST_BUFFER_DATA (*buf),
         buffersize);
     if (amount == buffersize) {
       break;
diff --git a/sys/v4l2/v4l2_calls.c b/sys/v4l2/v4l2_calls.c
index f318fc5b..3564d335 100644
--- a/sys/v4l2/v4l2_calls.c
+++ b/sys/v4l2/v4l2_calls.c
@@ -75,7 +75,7 @@ gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
     goto cap_failed;
 
   GST_LOG_OBJECT (e, "driver:      '%s'", v4l2object->vcap.driver);
@@ -124,7 +124,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     GstTunerChannel *channel;
 
     input.index = n;
-    if (ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
+    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
       if (errno == EINVAL)
         break;                  /* end of enumeration */
       else {
@@ -157,7 +157,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
       channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
 
       vtun.index = input.tuner;
-      if (ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
+      if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
         GST_ELEMENT_ERROR (e, RESOURCE, SETTINGS,
             (_("Failed to get setting of tuner %d on device '%s'."),
                 input.tuner, v4l2object->videodev), GST_ERROR_SYSTEM);
@@ -197,7 +197,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     standard.frameperiod.denominator = 0;
     standard.index = n;
 
-    if (ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
+    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
       if (errno == EINVAL || errno == ENOTTY)
         break;                  /* end of enumeration */
       else {
@@ -242,7 +242,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     }
 
     control.id = n;
-    if (ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
+    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
       if (errno == EINVAL) {
         if (n < V4L2_CID_PRIVATE_BASE)
           /* continue so that we also check private controls */
@@ -324,7 +324,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
       menu.id = n;
       for (i = 0;; i++) {
         menu.index = i;
-        if (ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
+        if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
           if (errno == EINVAL)
             break;              /* end of enumeration */
           else {
@@ -399,6 +399,7 @@ gboolean
 gst_v4l2_open (GstV4l2Object * v4l2object)
 {
   struct stat st;
+  int libv4l2_fd;
 
   GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
       v4l2object->videodev);
@@ -424,6 +425,17 @@ gst_v4l2_open (GstV4l2Object * v4l2object)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     goto not_open;
 
+  libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
+      V4L2_ENABLE_ENUM_FMT_EMULATION);
+  /* Note the v4l2_xxx functions are designed so that if they get passed an
+     unknown fd, the will behave exactly as their regular xxx counterparts, so
+     if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
+     cam format to normal formats conversion). Chances are big we will still
+     fail then though, as normally v4l2_fd_open only fails if the device is not
+     a v4l2 device. */
+  if (libv4l2_fd != -1)
+    v4l2object->video_fd = libv4l2_fd;
+
   /* get capabilities, error will be posted */
   if (!gst_v4l2_get_capabilities (v4l2object))
     goto error;
@@ -477,7 +489,7 @@ error:
   {
     if (GST_V4L2_IS_OPEN (v4l2object)) {
       /* close device */
-      close (v4l2object->video_fd);
+      v4l2_close (v4l2object->video_fd);
       v4l2object->video_fd = -1;
     }
     /* empty lists */
@@ -503,7 +515,7 @@ gst_v4l2_close (GstV4l2Object * v4l2object)
   GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
 
   /* close device */
-  close (v4l2object->video_fd);
+  v4l2_close (v4l2object->video_fd);
   v4l2object->video_fd = -1;
 
   /* empty lists */
@@ -526,7 +538,7 @@ gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
     goto std_failed;
 
   return TRUE;
@@ -554,7 +566,7 @@ gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
     goto std_failed;
 
   return TRUE;
@@ -590,7 +602,7 @@ gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
   channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
 
   freq.tuner = tunernum;
-  if (ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
     goto freq_failed;
 
   *frequency = freq.frequency * channel->freq_multiplicator;
@@ -631,10 +643,10 @@ gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
 
   freq.tuner = tunernum;
   /* fill in type - ignore error */
-  ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
+  v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
   freq.frequency = frequency / channel->freq_multiplicator;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
     goto freq_failed;
 
   return TRUE;
@@ -666,7 +678,7 @@ gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
     return FALSE;
 
   tuner.index = tunernum;
-  if (ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
     goto tuner_failed;
 
   *signal_strength = tuner.signal;
@@ -702,7 +714,7 @@ gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
 
   control.id = attribute_num;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
     goto ctrl_failed;
 
   *value = control.value;
@@ -739,7 +751,7 @@ gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
 
   control.id = attribute_num;
   control.value = value;
-  if (ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
     goto ctrl_failed;
 
   return TRUE;
@@ -764,7 +776,7 @@ gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
     goto input_failed;
 
   *input = n;
@@ -790,7 +802,7 @@ gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
+  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
     goto input_failed;
 
   return TRUE;
diff --git a/sys/v4l2/v4l2_calls.h b/sys/v4l2/v4l2_calls.h
index 5000cf21..8bf7bcea 100644
--- a/sys/v4l2/v4l2_calls.h
+++ b/sys/v4l2/v4l2_calls.h
@@ -27,6 +27,17 @@
 #include "gstv4l2object.h"
 #include "gst/gst-i18n-plugin.h"
 
+#ifdef HAVE_LIBV4L2
+#include <libv4l2.h>
+#else
+#define v4l2_fd_open(fd, flags) (fd)
+#define v4l2_close close
+#define v4l2_dup dup
+#define v4l2_ioctl ioctl
+#define v4l2_read read
+#define v4l2_mmap mmap
+#define v4l2_munmap munmap
+#endif
 
 /* simple check whether the device is open */
 #define GST_V4L2_IS_OPEN(v4l2object) \
diff --git a/sys/v4l2/v4l2src_calls.c b/sys/v4l2/v4l2src_calls.c
index 3643e5bb..6ff5945c 100644
--- a/sys/v4l2/v4l2src_calls.c
+++ b/sys/v4l2/v4l2src_calls.c
@@ -88,7 +88,7 @@ gst_v4l2_buffer_finalize (GstV4l2Buffer * buffer)
     pool->num_live_buffers--;
 
   if (pool->running) {
-    if (ioctl (pool->video_fd, VIDIOC_QBUF, &buffer->vbuffer) < 0) {
+    if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &buffer->vbuffer) < 0) {
       GST_WARNING ("could not requeue buffer %p %d", buffer, index);
     } else {
       /* FIXME: check that the caps didn't change */
@@ -106,7 +106,7 @@ gst_v4l2_buffer_finalize (GstV4l2Buffer * buffer)
   if (!resuscitated) {
     GST_LOG ("buffer %p not recovered, unmapping", buffer);
     gst_mini_object_unref (GST_MINI_OBJECT (pool));
-    munmap ((void *) GST_BUFFER_DATA (buffer), buffer->vbuffer.length);
+    v4l2_munmap ((void *) GST_BUFFER_DATA (buffer), buffer->vbuffer.length);
 
     GST_MINI_OBJECT_CLASS (v4l2buffer_parent_class)->finalize (GST_MINI_OBJECT
         (buffer));
@@ -165,7 +165,7 @@ gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index, GstCaps * caps)
   ret->vbuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
   ret->vbuffer.memory = V4L2_MEMORY_MMAP;
 
-  if (ioctl (pool->video_fd, VIDIOC_QUERYBUF, &ret->vbuffer) < 0)
+  if (v4l2_ioctl (pool->video_fd, VIDIOC_QUERYBUF, &ret->vbuffer) < 0)
     goto querybuf_failed;
 
   GST_LOG ("  index:     %u", ret->vbuffer.index);
@@ -179,7 +179,7 @@ gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index, GstCaps * caps)
   GST_LOG ("  length:    %u", ret->vbuffer.length);
   GST_LOG ("  input:     %u", ret->vbuffer.input);
 
-  data = (guint8 *) mmap (0, ret->vbuffer.length,
+  data = (guint8 *) v4l2_mmap (0, ret->vbuffer.length,
       PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
       ret->vbuffer.m.offset);
 
@@ -229,7 +229,7 @@ gst_v4l2_buffer_pool_finalize (GstV4l2BufferPool * pool)
   pool->lock = NULL;
 
   if (pool->video_fd >= 0)
-    close (pool->video_fd);
+    v4l2_close (pool->video_fd);
 
   if (pool->buffers) {
     g_free (pool->buffers);
@@ -292,7 +292,7 @@ gst_v4l2_buffer_pool_new (GstV4l2Src * v4l2src, gint fd, gint num_buffers,
 
   pool = (GstV4l2BufferPool *) gst_mini_object_new (GST_TYPE_V4L2_BUFFER_POOL);
 
-  pool->video_fd = dup (fd);
+  pool->video_fd = v4l2_dup (fd);
   if (pool->video_fd < 0)
     goto dup_failed;
 
@@ -344,7 +344,7 @@ gst_v4l2_buffer_pool_activate (GstV4l2BufferPool * pool, GstV4l2Src * v4l2src)
 
     GST_LOG ("enqueue pool buffer %d", n);
 
-    if (ioctl (pool->video_fd, VIDIOC_QBUF, buf) < 0)
+    if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, buf) < 0)
       goto queue_failed;
   }
   pool->running = TRUE;
@@ -527,7 +527,7 @@ gst_v4l2src_fill_format_list (GstV4l2Src * v4l2src)
     format->index = n;
     format->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 
-    if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
+    if (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
       if (errno == EINVAL) {
         g_free (format);
         break;                  /* end of enumeration */
@@ -603,7 +603,7 @@ gst_v4l2src_probe_caps_for_format_and_size (GstV4l2Src * v4l2src,
 
   /* keep in mind that v4l2 gives us frame intervals (durations); we invert the
    * fraction to get framerate */
-  if (ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
+  if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
     goto enum_frameintervals_failed;
 
   if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
@@ -629,7 +629,7 @@ gst_v4l2src_probe_caps_for_format_and_size (GstV4l2Src * v4l2src,
       gst_value_list_append_value (&rates, &rate);
 
       ival.index++;
-    } while (ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
+    } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
   } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
     GValue min = { 0, };
     GValue step = { 0, };
@@ -790,7 +790,7 @@ gst_v4l2src_probe_caps_for_format (GstV4l2Src * v4l2src, guint32 pixelformat,
 
   GST_DEBUG_OBJECT (v4l2src, "Enumerating frame sizes");
 
-  if (ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
+  if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
     goto enum_framesizes_failed;
 
   if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
@@ -810,7 +810,7 @@ gst_v4l2src_probe_caps_for_format (GstV4l2Src * v4l2src, guint32 pixelformat,
         results = g_list_prepend (results, tmp);
 
       size.index++;
-    } while (ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
+    } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
     GST_DEBUG_OBJECT (v4l2src, "done iterating discrete frame sizes");
   } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
     GST_DEBUG_OBJECT (v4l2src, "we have stepwise frame sizes:");
@@ -980,7 +980,7 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
   buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
   buffer.memory = V4L2_MEMORY_MMAP;
 
-  while (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) {
+  while (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) {
 
     GST_WARNING_OBJECT (v4l2src,
         "problem grabbing frame %d (ix=%d), trials=%d, pool-ct=%d, buf.flags=%d",
@@ -1198,7 +1198,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
   memset (&format, 0x00, sizeof (struct v4l2_format));
   format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 
-  if (ioctl (fd, VIDIOC_G_FMT, &format) < 0)
+  if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
     goto get_fmt_failed;
 
   format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -1210,7 +1210,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
    *  combined, there are other modes for requesting fields individually) */
   format.fmt.pix.field = V4L2_FIELD_INTERLACED;
 
-  if (ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
+  if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
     if (errno != EINVAL)
       goto set_fmt_failed;
 
@@ -1219,7 +1219,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
     format.fmt.pix.height = height;
     format.fmt.pix.pixelformat = pixelformat;
     format.fmt.pix.field = V4L2_FIELD_NONE;
-    if (ioctl (fd, VIDIOC_S_FMT, &format) < 0)
+    if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
       goto set_fmt_failed;
   }
 
@@ -1234,7 +1234,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
 
   memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
   stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-  if (ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
+  if (v4l2_ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
     GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
         (_("Could not get parameters on device '%s'"),
             v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
@@ -1264,7 +1264,7 @@ gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
   stream.parm.capture.timeperframe.denominator = fps_n;
 
   /* some cheap USB cam's won't accept any change */
-  if (ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
+  if (v4l2_ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
     GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
         (_("Video input device did not accept new frame rate setting.")),
         GST_ERROR_SYSTEM);
@@ -1346,7 +1346,7 @@ gst_v4l2src_capture_init (GstV4l2Src * v4l2src, GstCaps * caps)
     breq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     breq.memory = V4L2_MEMORY_MMAP;
 
-    if (ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
+    if (v4l2_ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
       goto reqbufs_failed;
 
     GST_LOG_OBJECT (v4l2src, " count:  %u", breq.count);
@@ -1441,7 +1441,7 @@ gst_v4l2src_capture_start (GstV4l2Src * v4l2src)
     if (!gst_v4l2_buffer_pool_activate (v4l2src->pool, v4l2src))
       goto pool_activate_failed;
 
-    if (ioctl (fd, VIDIOC_STREAMON, &type) < 0)
+    if (v4l2_ioctl (fd, VIDIOC_STREAMON, &type) < 0)
       goto streamon_failed;
   }
 
@@ -1486,7 +1486,7 @@ gst_v4l2src_capture_stop (GstV4l2Src * v4l2src)
   if (v4l2src->use_mmap) {
     /* we actually need to sync on all queued buffers but not
      * on the non-queued ones */
-    if (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMOFF, &type) < 0)
+    if (v4l2_ioctl (v4l2src->v4l2object->video_fd, VIDIOC_STREAMOFF, &type) < 0)
       goto streamoff_failed;
   }
 
@@ -1562,14 +1562,14 @@ gst_v4l2src_get_nearest_size (GstV4l2Src * v4l2src, guint32 pixelformat,
   fmt.fmt.pix.pixelformat = pixelformat;
   fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
 
-  r = ioctl (fd, VIDIOC_TRY_FMT, &fmt);
+  r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
   if (r < 0 && errno == EINVAL) {
     /* try again with progressive video */
     fmt.fmt.pix.width = *width;
     fmt.fmt.pix.height = *height;
     fmt.fmt.pix.pixelformat = pixelformat;
     fmt.fmt.pix.field = V4L2_FIELD_NONE;
-    r = ioctl (fd, VIDIOC_TRY_FMT, &fmt);
+    r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
   }
 
   if (r < 0) {
@@ -1589,14 +1589,14 @@ gst_v4l2src_get_nearest_size (GstV4l2Src * v4l2src, guint32 pixelformat,
     fmt.fmt.pix.width = *width;
     fmt.fmt.pix.height = *height;
 
-    r = ioctl (fd, VIDIOC_S_FMT, &fmt);
+    r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
     if (r < 0 && errno == EINVAL) {
       /* try again with progressive video */
       fmt.fmt.pix.width = *width;
       fmt.fmt.pix.height = *height;
       fmt.fmt.pix.pixelformat = pixelformat;
       fmt.fmt.pix.field = V4L2_FIELD_NONE;
-      r = ioctl (fd, VIDIOC_S_FMT, &fmt);
+      r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
     }
 
     if (r < 0)