From 31d8a1d929fecd7ceaa7575be5921f9148ed8afb Mon Sep 17 00:00:00 2001
From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Date: Mon, 24 Jul 2017 14:19:02 -0400
Subject: [PATCH] v4l2: Add run-time environment to enable libv4l2

The library has started preventing a lot of interesting use cases,
like CREATE_BUFS, DMABuf, usage of TRY_FMT. As the libv4l2 is totally
inactive and not maintained, we decided to disable it. As a convenience
we added a run-time environment that let you enable it for testing.

  GST_V4L2_USE_LIBV4L2=1

This of course only works if you have enabled libv4l2 at build time.
---
 sys/v4l2/gstv4l2allocator.c  | 102 ++++++++++++++++++++++++-------------------
 sys/v4l2/gstv4l2allocator.h  |   8 ++--
 sys/v4l2/gstv4l2bufferpool.c |  11 +++--
 sys/v4l2/gstv4l2h264enc.c    |   8 ++--
 sys/v4l2/gstv4l2object.c     |  65 ++++++++++++++++++---------
 sys/v4l2/gstv4l2object.h     |  24 +++++-----
 sys/v4l2/gstv4l2radio.c      |   4 +-
 sys/v4l2/gstv4l2sink.c       |  16 +++----
 sys/v4l2/gstv4l2src.c        |   4 ++
 sys/v4l2/gstv4l2videodec.c   |   2 +-
 sys/v4l2/gstv4l2videoenc.c   |   2 +-
 sys/v4l2/v4l2_calls.c        |  55 +++++++++++++----------
 12 files changed, 171 insertions(+), 130 deletions(-)

diff --git a/sys/v4l2/gstv4l2allocator.c b/sys/v4l2/gstv4l2allocator.c
index 122a8b5..c47b8c5 100644
--- a/sys/v4l2/gstv4l2allocator.c
+++ b/sys/v4l2/gstv4l2allocator.c
@@ -241,9 +241,9 @@ gst_v4l2_memory_group_free (GstV4l2MemoryGroup * group)
 static GstV4l2MemoryGroup *
 gst_v4l2_memory_group_new (GstV4l2Allocator * allocator, guint32 index)
 {
-  gint video_fd = allocator->video_fd;
+  GstV4l2Object *obj = allocator->obj;
   guint32 memory = allocator->memory;
-  struct v4l2_format *format = &allocator->format;
+  struct v4l2_format *format = &obj->format;
   GstV4l2MemoryGroup *group;
   gsize img_size, buf_size;
 
@@ -260,7 +260,7 @@ gst_v4l2_memory_group_new (GstV4l2Allocator * allocator, guint32 index)
     group->n_mem = 1;
   }
 
-  if (v4l2_ioctl (video_fd, VIDIOC_QUERYBUF, &group->buffer) < 0)
+  if (obj->ioctl (obj->video_fd, VIDIOC_QUERYBUF, &group->buffer) < 0)
     goto querybuf_failed;
 
   if (group->buffer.index != index) {
@@ -273,17 +273,17 @@ gst_v4l2_memory_group_new (GstV4l2Allocator * allocator, guint32 index)
 
   /* Check that provided size matches the format we have negotiation. Failing
    * there usually means a driver of libv4l bug. */
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     gint i;
 
     for (i = 0; i < group->n_mem; i++) {
-      img_size = allocator->format.fmt.pix_mp.plane_fmt[i].sizeimage;
+      img_size = obj->format.fmt.pix_mp.plane_fmt[i].sizeimage;
       buf_size = group->planes[i].length;
       if (buf_size < img_size)
         goto buffer_too_short;
     }
   } else {
-    img_size = allocator->format.fmt.pix.sizeimage;
+    img_size = obj->format.fmt.pix.sizeimage;
     buf_size = group->buffer.length;
     if (buf_size < img_size)
       goto buffer_too_short;
@@ -378,6 +378,7 @@ static void
 gst_v4l2_allocator_free (GstAllocator * gallocator, GstMemory * gmem)
 {
   GstV4l2Allocator *allocator = (GstV4l2Allocator *) gallocator;
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2Memory *mem = (GstV4l2Memory *) gmem;
   GstV4l2MemoryGroup *group = mem->group;
 
@@ -388,7 +389,7 @@ gst_v4l2_allocator_free (GstAllocator * gallocator, GstMemory * gmem)
 
     if (allocator->memory == V4L2_MEMORY_MMAP) {
       if (mem->data)
-        v4l2_munmap (mem->data, group->planes[mem->plane].length);
+        obj->munmap (mem->data, group->planes[mem->plane].length);
     }
 
     /* This apply for both mmap with expbuf, and dmabuf imported memory */
@@ -424,7 +425,6 @@ gst_v4l2_allocator_finalize (GObject * obj)
 
   GST_LOG_OBJECT (obj, "called");
 
-  v4l2_close (allocator->video_fd);
   gst_atomic_queue_unref (allocator->free_queue);
 
   G_OBJECT_CLASS (parent_class)->finalize (obj);
@@ -478,22 +478,23 @@ static guint32
 gst_v4l2_allocator_probe (GstV4l2Allocator * allocator, guint32 memory,
     guint32 breq_flag, guint32 bcreate_flag)
 {
+  GstV4l2Object *obj = allocator->obj;
   struct v4l2_requestbuffers breq = { 0 };
   guint32 flags = 0;
 
-  breq.type = allocator->type;
+  breq.type = obj->type;
   breq.count = 0;
   breq.memory = memory;
 
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_REQBUFS, &breq) == 0) {
+  if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) == 0) {
     struct v4l2_create_buffers bcreate = { 0 };
 
     flags |= breq_flag;
 
     bcreate.memory = memory;
-    bcreate.format = allocator->format;
+    bcreate.format = obj->format;
 
-    if ((v4l2_ioctl (allocator->video_fd, VIDIOC_CREATE_BUFS, &bcreate) == 0))
+    if ((obj->ioctl (obj->video_fd, VIDIOC_CREATE_BUFS, &bcreate) == 0))
       flags |= bcreate_flag;
   }
 
@@ -503,6 +504,7 @@ gst_v4l2_allocator_probe (GstV4l2Allocator * allocator, guint32 memory,
 static GstV4l2MemoryGroup *
 gst_v4l2_allocator_create_buf (GstV4l2Allocator * allocator)
 {
+  GstV4l2Object *obj = allocator->obj;
   struct v4l2_create_buffers bcreate = { 0 };
   GstV4l2MemoryGroup *group = NULL;
 
@@ -512,13 +514,13 @@ gst_v4l2_allocator_create_buf (GstV4l2Allocator * allocator)
     goto done;
 
   bcreate.memory = allocator->memory;
-  bcreate.format = allocator->format;
+  bcreate.format = obj->format;
   bcreate.count = 1;
 
   if (!allocator->can_allocate)
     goto done;
 
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_CREATE_BUFS, &bcreate) < 0)
+  if (obj->ioctl (obj->video_fd, VIDIOC_CREATE_BUFS, &bcreate) < 0)
     goto create_bufs_failed;
 
   if (allocator->groups[bcreate.index] != NULL)
@@ -577,6 +579,7 @@ static void
 gst_v4l2_allocator_reset_size (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group)
 {
+  GstV4l2Object *obj = allocator->obj;
   gsize size;
   gboolean imported = FALSE;
 
@@ -587,11 +590,11 @@ gst_v4l2_allocator_reset_size (GstV4l2Allocator * allocator,
       break;
   }
 
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     gint i;
 
     for (i = 0; i < group->n_mem; i++) {
-      size = allocator->format.fmt.pix_mp.plane_fmt[i].sizeimage;
+      size = obj->format.fmt.pix_mp.plane_fmt[i].sizeimage;
 
       if (imported)
         group->mem[i]->maxsize = size;
@@ -600,7 +603,7 @@ gst_v4l2_allocator_reset_size (GstV4l2Allocator * allocator,
     }
 
   } else {
-    size = allocator->format.fmt.pix.sizeimage;
+    size = obj->format.fmt.pix.sizeimage;
 
     if (imported)
       group->mem[0]->maxsize = size;
@@ -628,8 +631,7 @@ _cleanup_failed_alloc (GstV4l2Allocator * allocator, GstV4l2MemoryGroup * group)
 
 
 GstV4l2Allocator *
-gst_v4l2_allocator_new (GstObject * parent, gint video_fd,
-    struct v4l2_format *format)
+gst_v4l2_allocator_new (GstObject * parent, GstV4l2Object * v4l2object)
 {
   GstV4l2Allocator *allocator;
   guint32 flags = 0;
@@ -644,9 +646,7 @@ gst_v4l2_allocator_new (GstObject * parent, gint video_fd,
   g_free (name);
 
   /* Save everything */
-  allocator->video_fd = v4l2_dup (video_fd);
-  allocator->type = format->type;
-  allocator->format = *format;
+  allocator->obj = v4l2object;
 
   flags |= GST_V4L2_ALLOCATOR_PROBE (allocator, MMAP);
   flags |= GST_V4L2_ALLOCATOR_PROBE (allocator, USERPTR);
@@ -672,7 +672,8 @@ guint
 gst_v4l2_allocator_start (GstV4l2Allocator * allocator, guint32 count,
     guint32 memory)
 {
-  struct v4l2_requestbuffers breq = { count, allocator->type, memory };
+  GstV4l2Object *obj = allocator->obj;
+  struct v4l2_requestbuffers breq = { count, obj->type, memory };
   gboolean can_allocate;
   gint i;
 
@@ -683,7 +684,7 @@ gst_v4l2_allocator_start (GstV4l2Allocator * allocator, guint32 count,
   if (g_atomic_int_get (&allocator->active))
     goto already_active;
 
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_REQBUFS, &breq) < 0)
+  if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) < 0)
     goto reqbufs_failed;
 
   if (breq.count < 1)
@@ -752,7 +753,8 @@ error:
 GstV4l2Return
 gst_v4l2_allocator_stop (GstV4l2Allocator * allocator)
 {
-  struct v4l2_requestbuffers breq = { 0, allocator->type, allocator->memory };
+  GstV4l2Object *obj = allocator->obj;
+  struct v4l2_requestbuffers breq = { 0, obj->type, allocator->memory };
   gint i = 0;
   GstV4l2Return ret = GST_V4L2_OK;
 
@@ -781,7 +783,7 @@ gst_v4l2_allocator_stop (GstV4l2Allocator * allocator)
   }
 
   /* Not all drivers support rebufs(0), so warn only */
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_REQBUFS, &breq) < 0)
+  if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) < 0)
     GST_WARNING_OBJECT (allocator,
         "error releasing buffers buffers: %s", g_strerror (errno));
 
@@ -797,6 +799,7 @@ done:
 GstV4l2MemoryGroup *
 gst_v4l2_allocator_alloc_mmap (GstV4l2Allocator * allocator)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2MemoryGroup *group;
   gint i;
 
@@ -810,8 +813,8 @@ gst_v4l2_allocator_alloc_mmap (GstV4l2Allocator * allocator)
   for (i = 0; i < group->n_mem; i++) {
     if (group->mem[i] == NULL) {
       gpointer data;
-      data = v4l2_mmap (NULL, group->planes[i].length, PROT_READ | PROT_WRITE,
-          MAP_SHARED, allocator->video_fd, group->planes[i].m.mem_offset);
+      data = obj->mmap (NULL, group->planes[i].length, PROT_READ | PROT_WRITE,
+          MAP_SHARED, obj->video_fd, group->planes[i].m.mem_offset);
 
       if (data == MAP_FAILED)
         goto mmap_failed;
@@ -852,6 +855,7 @@ GstV4l2MemoryGroup *
 gst_v4l2_allocator_alloc_dmabuf (GstV4l2Allocator * allocator,
     GstAllocator * dmabuf_allocator)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2MemoryGroup *group;
   gint i;
 
@@ -870,12 +874,12 @@ gst_v4l2_allocator_alloc_dmabuf (GstV4l2Allocator * allocator,
     if (group->mem[i] == NULL) {
       struct v4l2_exportbuffer expbuf = { 0 };
 
-      expbuf.type = allocator->type;
+      expbuf.type = obj->type;
       expbuf.index = group->buffer.index;
       expbuf.plane = i;
       expbuf.flags = O_CLOEXEC | O_RDWR;
 
-      if (v4l2_ioctl (allocator->video_fd, VIDIOC_EXPBUF, &expbuf) < 0)
+      if (obj->ioctl (obj->video_fd, VIDIOC_EXPBUF, &expbuf) < 0)
         goto expbuf_failed;
 
       GST_LOG_OBJECT (allocator, "exported DMABUF as fd %i plane %d",
@@ -933,6 +937,7 @@ static void
 gst_v4l2_allocator_clear_dmabufin (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2Memory *mem;
   gint i;
 
@@ -961,7 +966,7 @@ gst_v4l2_allocator_clear_dmabufin (GstV4l2Allocator * allocator,
     group->planes[i].data_offset = 0;
   }
 
-  if (!V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     group->buffer.bytesused = 0;
     group->buffer.length = 0;
     group->buffer.m.fd = -1;
@@ -1004,6 +1009,7 @@ static void
 gst_v4l2_allocator_clear_userptr (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2Memory *mem;
   gint i;
 
@@ -1024,7 +1030,7 @@ gst_v4l2_allocator_clear_userptr (GstV4l2Allocator * allocator,
     group->planes[i].m.userptr = 0;
   }
 
-  if (!V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     group->buffer.bytesused = 0;
     group->buffer.length = 0;
     group->buffer.m.userptr = 0;
@@ -1068,6 +1074,7 @@ gboolean
 gst_v4l2_allocator_import_dmabuf (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group, gint n_mem, GstMemory ** dma_mem)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2Memory *mem;
   gint i;
 
@@ -1106,7 +1113,7 @@ gst_v4l2_allocator_import_dmabuf (GstV4l2Allocator * allocator,
   }
 
   /* Copy into buffer structure if not using planes */
-  if (!V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     group->buffer.bytesused = group->planes[0].bytesused;
     group->buffer.length = group->planes[0].length;
     group->buffer.m.fd = group->planes[0].m.userptr;
@@ -1140,24 +1147,25 @@ gst_v4l2_allocator_import_userptr (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group, gsize img_size, int n_planes,
     gpointer * data, gsize * size)
 {
+  GstV4l2Object *obj = allocator->obj;
   GstV4l2Memory *mem;
   gint i;
 
   g_return_val_if_fail (allocator->memory == V4L2_MEMORY_USERPTR, FALSE);
 
   /* TODO Support passing N plane from 1 memory to MPLANE v4l2 format */
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type) && n_planes != group->n_mem)
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type) && n_planes != group->n_mem)
     goto n_mem_missmatch;
 
   for (i = 0; i < group->n_mem; i++) {
     gsize maxsize, psize;
 
-    if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
-      struct v4l2_pix_format_mplane *pix = &allocator->format.fmt.pix_mp;
+    if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
+      struct v4l2_pix_format_mplane *pix = &obj->format.fmt.pix_mp;
       maxsize = pix->plane_fmt[i].sizeimage;
       psize = size[i];
     } else {
-      maxsize = allocator->format.fmt.pix.sizeimage;
+      maxsize = obj->format.fmt.pix.sizeimage;
       psize = img_size;
     }
 
@@ -1179,7 +1187,7 @@ gst_v4l2_allocator_import_userptr (GstV4l2Allocator * allocator,
   }
 
   /* Copy into buffer structure if not using planes */
-  if (!V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     group->buffer.bytesused = group->planes[0].bytesused;
     group->buffer.length = group->planes[0].length;
     group->buffer.m.userptr = group->planes[0].m.userptr;
@@ -1229,13 +1237,14 @@ gboolean
 gst_v4l2_allocator_qbuf (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup * group)
 {
+  GstV4l2Object *obj = allocator->obj;
   gboolean ret = TRUE;
   gint i;
 
   g_return_val_if_fail (g_atomic_int_get (&allocator->active), FALSE);
 
   /* update sizes */
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     for (i = 0; i < group->n_mem; i++)
       group->planes[i].bytesused =
           gst_memory_get_sizes (group->mem[i], NULL, NULL);
@@ -1247,7 +1256,7 @@ gst_v4l2_allocator_qbuf (GstV4l2Allocator * allocator,
   for (i = 0; i < group->n_mem; i++)
     gst_memory_ref (group->mem[i]);
 
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_QBUF, &group->buffer) < 0) {
+  if (obj->ioctl (obj->video_fd, VIDIOC_QBUF, &group->buffer) < 0) {
     GST_ERROR_OBJECT (allocator, "failed queueing buffer %i: %s",
         group->buffer.index, g_strerror (errno));
 
@@ -1281,6 +1290,7 @@ GstFlowReturn
 gst_v4l2_allocator_dqbuf (GstV4l2Allocator * allocator,
     GstV4l2MemoryGroup ** group_out)
 {
+  GstV4l2Object *obj = allocator->obj;
   struct v4l2_buffer buffer = { 0 };
   struct v4l2_plane planes[VIDEO_MAX_PLANES] = { {0} };
   gint i;
@@ -1289,15 +1299,15 @@ gst_v4l2_allocator_dqbuf (GstV4l2Allocator * allocator,
 
   g_return_val_if_fail (g_atomic_int_get (&allocator->active), GST_FLOW_ERROR);
 
-  buffer.type = allocator->type;
+  buffer.type = obj->type;
   buffer.memory = allocator->memory;
 
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
-    buffer.length = allocator->format.fmt.pix_mp.num_planes;
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
+    buffer.length = obj->format.fmt.pix_mp.num_planes;
     buffer.m.planes = planes;
   }
 
-  if (v4l2_ioctl (allocator->video_fd, VIDIOC_DQBUF, &buffer) < 0)
+  if (obj->ioctl (obj->video_fd, VIDIOC_DQBUF, &buffer) < 0)
     goto error;
 
   group = allocator->groups[buffer.index];
@@ -1319,7 +1329,7 @@ gst_v4l2_allocator_dqbuf (GstV4l2Allocator * allocator,
     UNSET_QUEUED (group->buffer);
   }
 
-  if (V4L2_TYPE_IS_MULTIPLANAR (allocator->type)) {
+  if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
     group->buffer.m.planes = group->planes;
     memcpy (group->planes, buffer.m.planes, sizeof (planes));
   } else {
@@ -1330,7 +1340,7 @@ gst_v4l2_allocator_dqbuf (GstV4l2Allocator * allocator,
   }
 
   /* And update memory size */
-  if (V4L2_TYPE_IS_OUTPUT (allocator->type)) {
+  if (V4L2_TYPE_IS_OUTPUT (obj->type)) {
     gst_v4l2_allocator_reset_size (allocator, group);
   } else {
     /* for capture, simply read the size */
diff --git a/sys/v4l2/gstv4l2allocator.h b/sys/v4l2/gstv4l2allocator.h
index a260389..9826815 100644
--- a/sys/v4l2/gstv4l2allocator.h
+++ b/sys/v4l2/gstv4l2allocator.h
@@ -50,6 +50,7 @@ typedef struct _GstV4l2MemoryGroup GstV4l2MemoryGroup;
 typedef struct _GstV4l2Memory GstV4l2Memory;
 typedef enum _GstV4l2Capabilities GstV4l2Capabilities;
 typedef enum _GstV4l2Return GstV4l2Return;
+typedef struct _GstV4l2Object GstV4l2Object;
 
 enum _GstV4l2AllocatorFlags
 {
@@ -89,11 +90,9 @@ struct _GstV4l2MemoryGroup
 struct _GstV4l2Allocator
 {
   GstAllocator parent;
-  gint video_fd;
+  GstV4l2Object *obj;
   guint32 count;
-  guint32 type;
   guint32 memory;
-  struct v4l2_format format;
   gboolean can_allocate;
   gboolean active;
 
@@ -117,8 +116,7 @@ gboolean             gst_v4l2_allocator_is_active      (GstV4l2Allocator * alloc
 
 guint                gst_v4l2_allocator_get_size       (GstV4l2Allocator * allocator);
 
-GstV4l2Allocator*    gst_v4l2_allocator_new            (GstObject *parent, gint video_fd,
-                                                        struct v4l2_format * format);
+GstV4l2Allocator*    gst_v4l2_allocator_new            (GstObject *parent, GstV4l2Object * obj);
 
 guint                gst_v4l2_allocator_start          (GstV4l2Allocator * allocator,
                                                         guint32 count, guint32 memory);
diff --git a/sys/v4l2/gstv4l2bufferpool.c b/sys/v4l2/gstv4l2bufferpool.c
index edfba00..46c6691 100644
--- a/sys/v4l2/gstv4l2bufferpool.c
+++ b/sys/v4l2/gstv4l2bufferpool.c
@@ -621,7 +621,7 @@ gst_v4l2_buffer_pool_streamon (GstV4l2BufferPool * pool)
     case GST_V4L2_IO_DMABUF:
     case GST_V4L2_IO_DMABUF_IMPORT:
       if (!pool->streaming) {
-        if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
+        if (obj->ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
           goto streamon_failed;
 
         pool->streaming = TRUE;
@@ -654,7 +654,7 @@ gst_v4l2_buffer_pool_streamoff (GstV4l2BufferPool * pool)
     case GST_V4L2_IO_DMABUF:
     case GST_V4L2_IO_DMABUF_IMPORT:
       if (pool->streaming) {
-        if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMOFF, &obj->type) < 0)
+        if (obj->ioctl (pool->video_fd, VIDIOC_STREAMOFF, &obj->type) < 0)
           GST_WARNING_OBJECT (pool, "STREAMOFF failed with errno %d (%s)",
               errno, g_strerror (errno));
 
@@ -728,7 +728,7 @@ gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
        * queue to be initialized now. We only do this if we have a streaming
        * driver. */
       if (obj->device_caps & V4L2_CAP_STREAMING)
-        v4l2_read (obj->video_fd, NULL, 0);
+        obj->read (obj->video_fd, NULL, 0);
 #endif
       break;
     case GST_V4L2_IO_DMABUF:
@@ -1609,8 +1609,7 @@ gst_v4l2_buffer_pool_new (GstV4l2Object * obj, GstCaps * caps)
   pool->obj = obj;
   pool->can_poll_device = TRUE;
 
-  pool->vallocator =
-      gst_v4l2_allocator_new (GST_OBJECT (pool), obj->video_fd, &obj->format);
+  pool->vallocator = gst_v4l2_allocator_new (GST_OBJECT (pool), obj);
   if (pool->vallocator == NULL)
     goto allocator_failed;
 
@@ -1657,7 +1656,7 @@ gst_v4l2_do_read (GstV4l2BufferPool * pool, GstBuffer * buf)
     if ((res = gst_v4l2_buffer_pool_poll (pool)) != GST_FLOW_OK)
       goto poll_error;
 
-    amount = v4l2_read (obj->video_fd, map.data, toread);
+    amount = obj->read (obj->video_fd, map.data, toread);
 
     if (amount == toread) {
       break;
diff --git a/sys/v4l2/gstv4l2h264enc.c b/sys/v4l2/gstv4l2h264enc.c
index 0a1faec..3d5b16b 100644
--- a/sys/v4l2/gstv4l2h264enc.c
+++ b/sys/v4l2/gstv4l2h264enc.c
@@ -329,7 +329,7 @@ negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
       if (control.value < 0)
         continue;
 
-      if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
+      if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
         GST_WARNING_OBJECT (ctx->self, "Failed to set H264 profile: '%s'",
             g_strerror (errno));
         break;
@@ -371,7 +371,7 @@ negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
       if (control.value < 0)
         continue;
 
-      if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
+      if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
         GST_WARNING_OBJECT (ctx->self, "Failed to set H264 level: '%s'",
             g_strerror (errno));
         break;
@@ -436,7 +436,7 @@ gst_v4l2_h264_enc_negotiate (GstVideoEncoder * encoder)
 
     control.id = V4L2_CID_MPEG_VIDEO_H264_PROFILE;
 
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
       goto g_ctrl_failed;
 
     ctx.profile = v4l2_profile_to_string (control.value);
@@ -447,7 +447,7 @@ gst_v4l2_h264_enc_negotiate (GstVideoEncoder * encoder)
 
     control.id = V4L2_CID_MPEG_VIDEO_H264_LEVEL;
 
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
       goto g_ctrl_failed;
 
     ctx.level = v4l2_level_to_string (control.value);
diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 859925e..adf2fa3 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -27,6 +27,9 @@
 #include <errno.h>
 #include <unistd.h>
 #include <string.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
 
 #ifdef HAVE_GUDEV
 #include <gudev/gudev.h>
@@ -490,6 +493,28 @@ gst_v4l2_object_new (GstElement * element,
 
   v4l2object->no_initial_format = FALSE;
 
+  /* We now disable libv4l2 by default, but have an env to enable it. */
+#ifdef HAVE_LIBV4L2
+  if (g_getenv ("GST_V4L2_USE_LIBV4L2")) {
+    v4l2object->fd_open = v4l2_fd_open;
+    v4l2object->close = v4l2_close;
+    v4l2object->dup = v4l2_dup;
+    v4l2object->ioctl = v4l2_ioctl;
+    v4l2object->read = v4l2_read;
+    v4l2object->mmap = v4l2_mmap;
+    v4l2object->munmap = v4l2_munmap;
+  } else
+#endif
+  {
+    v4l2object->fd_open = NULL;
+    v4l2object->close = close;
+    v4l2object->dup = dup;
+    v4l2object->ioctl = ioctl;
+    v4l2object->read = read;
+    v4l2object->mmap = mmap;
+    v4l2object->munmap = munmap;
+  }
+
   return v4l2object;
 }
 
@@ -775,7 +800,7 @@ gst_v4l2_get_driver_min_buffers (GstV4l2Object * v4l2object)
   else
     control.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) == 0) {
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) == 0) {
     GST_DEBUG_OBJECT (v4l2object->element,
         "driver requires a minimum of %d buffers", control.value);
     v4l2object->min_buffers = control.value;
@@ -1113,7 +1138,7 @@ gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object,
     format->index = n;
     format->type = type;
 
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) {
       if (errno == EINVAL) {
         g_free (format);
         break;                  /* end of enumeration */
@@ -2065,7 +2090,7 @@ gst_v4l2_object_try_fmt (GstV4l2Object * v4l2object,
   int r;
 
   memcpy (&fmt, try_fmt, sizeof (fmt));
-  r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
+  r = v4l2object->ioctl (fd, VIDIOC_TRY_FMT, &fmt);
 
   if (r < 0 && errno == ENOTTY) {
     /* The driver might not implement TRY_FMT, in which case we will try
@@ -2074,7 +2099,7 @@ gst_v4l2_object_try_fmt (GstV4l2Object * v4l2object,
       goto error;
 
     memcpy (&fmt, try_fmt, sizeof (fmt));
-    r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
+    r = v4l2object->ioctl (fd, VIDIOC_S_FMT, &fmt);
   }
   memcpy (try_fmt, &fmt, sizeof (fmt));
 
@@ -2269,7 +2294,7 @@ gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object,
 
   /* keep in mind that v4l2 gives us frame intervals (durations); we invert the
    * fraction to get framerate */
-  if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
+  if (v4l2object->ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0)
     goto enum_frameintervals_failed;
 
   if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) {
@@ -2296,7 +2321,7 @@ gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object,
       gst_value_list_append_value (&rates, &rate);
 
       ival.index++;
-    } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
+    } while (v4l2object->ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
   } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) {
     GValue min = { 0, };
     GValue step = { 0, };
@@ -2535,7 +2560,7 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
       "Enumerating frame sizes for %" GST_FOURCC_FORMAT,
       GST_FOURCC_ARGS (pixelformat));
 
-  if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
+  if (v4l2object->ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0)
     goto enum_framesizes_failed;
 
   if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
@@ -2556,7 +2581,7 @@ gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object,
       }
 
       size.index++;
-    } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
+    } while (v4l2object->ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0);
     GST_DEBUG_OBJECT (v4l2object->element,
         "done iterating discrete frame sizes");
   } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) {
@@ -3369,10 +3394,10 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
   }
 
   if (try_only) {
-    if (v4l2_ioctl (fd, VIDIOC_TRY_FMT, &format) < 0)
+    if (v4l2object->ioctl (fd, VIDIOC_TRY_FMT, &format) < 0)
       goto try_fmt_failed;
   } else {
-    if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
+    if (v4l2object->ioctl (fd, VIDIOC_S_FMT, &format) < 0)
       goto set_fmt_failed;
   }
 
@@ -3454,7 +3479,7 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
     ctl.id = V4L2_CID_ALPHA_COMPONENT;
     ctl.value = 0xff;
 
-    if (v4l2_ioctl (fd, VIDIOC_S_CTRL, &ctl) < 0)
+    if (v4l2object->ioctl (fd, VIDIOC_S_CTRL, &ctl) < 0)
       GST_WARNING_OBJECT (v4l2object->element,
           "Failed to set alpha component value");
   }
@@ -3466,7 +3491,7 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
   memset (&streamparm, 0x00, sizeof (struct v4l2_streamparm));
   streamparm.type = v4l2object->type;
 
-  if (v4l2_ioctl (fd, VIDIOC_G_PARM, &streamparm) < 0)
+  if (v4l2object->ioctl (fd, VIDIOC_G_PARM, &streamparm) < 0)
     goto get_parm_failed;
 
   if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE
@@ -3500,7 +3525,7 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
     streamparm.parm.capture.timeperframe.denominator = fps_n;
 
     /* some cheap USB cam's won't accept any change */
-    if (v4l2_ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
+    if (v4l2object->ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
       goto set_parm_failed;
 
     if (streamparm.parm.capture.timeperframe.numerator > 0 &&
@@ -3542,7 +3567,7 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
     streamparm.parm.output.timeperframe.numerator = fps_d;
     streamparm.parm.output.timeperframe.denominator = fps_n;
 
-    if (v4l2_ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
+    if (v4l2object->ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0)
       goto set_parm_failed;
 
     if (streamparm.parm.output.timeperframe.numerator > 0 &&
@@ -3750,7 +3775,7 @@ gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info)
 
   memset (&fmt, 0x00, sizeof (struct v4l2_format));
   fmt.type = v4l2object->type;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FMT, &fmt) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FMT, &fmt) < 0)
     goto get_fmt_failed;
 
   fmtdesc = gst_v4l2_object_get_format_from_fourcc (v4l2object,
@@ -3775,13 +3800,13 @@ gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info)
   memset (&sel, 0, sizeof (struct v4l2_selection));
   sel.type = v4l2object->type;
   sel.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_SELECTION, &sel) >= 0) {
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_SELECTION, &sel) >= 0) {
     r = &sel.r;
   } else {
     /* For ancient kernels, fall back to G_CROP */
     memset (&crop, 0, sizeof (struct v4l2_crop));
     crop.type = v4l2object->type;
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CROP, &crop) >= 0)
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CROP, &crop) >= 0)
       r = &crop.c;
   }
   if (r) {
@@ -3869,12 +3894,12 @@ gst_v4l2_object_set_crop (GstV4l2Object * obj)
       "Desired cropping left %u, top %u, size %ux%u", crop.c.left, crop.c.top,
       crop.c.width, crop.c.height);
 
-  if (v4l2_ioctl (obj->video_fd, VIDIOC_S_CROP, &crop) < 0) {
+  if (obj->ioctl (obj->video_fd, VIDIOC_S_CROP, &crop) < 0) {
     GST_WARNING_OBJECT (obj->element, "VIDIOC_S_CROP failed");
     return FALSE;
   }
 
-  if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CROP, &crop) < 0) {
+  if (obj->ioctl (obj->video_fd, VIDIOC_G_CROP, &crop) < 0) {
     GST_WARNING_OBJECT (obj->element, "VIDIOC_G_CROP failed");
     return FALSE;
   }
@@ -3972,7 +3997,7 @@ gst_v4l2_object_probe_caps (GstV4l2Object * v4l2object, GstCaps * filter)
     memset (&cropcap, 0, sizeof (cropcap));
 
     cropcap.type = v4l2object->type;
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_CROPCAP, &cropcap) < 0) {
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_CROPCAP, &cropcap) < 0) {
       if (errno != ENOTTY)
         GST_WARNING_OBJECT (v4l2object->element,
             "Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: %s",
diff --git a/sys/v4l2/gstv4l2object.h b/sys/v4l2/gstv4l2object.h
index 0df840e..b39687d 100644
--- a/sys/v4l2/gstv4l2object.h
+++ b/sys/v4l2/gstv4l2object.h
@@ -24,23 +24,11 @@
 #ifndef __GST_V4L2_OBJECT_H__
 #define __GST_V4L2_OBJECT_H__
 
+#include "ext/videodev2.h"
 #ifdef HAVE_LIBV4L2
 #  include <libv4l2.h>
-#else
-#  include "ext/videodev2.h"
-#  include <sys/ioctl.h>
-#  include <sys/mman.h>
-#  include <unistd.h>
-#  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
 
-#include "ext/videodev2.h"
 #include "v4l2-utils.h"
 
 #include <gst/gst.h>
@@ -212,6 +200,16 @@ struct _GstV4l2Object {
   GstV4l2SetInOutFunction  set_in_out_func;
   GstV4l2UpdateFpsFunction update_fps_func;
 
+  /* syscalls */
+  int (*fd_open) (int fd, int v4l2_flags);
+  int (*close) (int fd);
+  int (*dup) (int fd);
+  int (*ioctl) (int fd, unsigned long int request, ...);
+  ssize_t (*read) (int fd, void *buffer, size_t n);
+  void * (*mmap) (void *start, size_t length, int prot, int flags,
+      int fd, int64_t offset);
+  int (*munmap) (void *_start, size_t length);
+
   /* Quirks */
   /* Skips interlacing probes */
   gboolean never_interlaced;
diff --git a/sys/v4l2/gstv4l2radio.c b/sys/v4l2/gstv4l2radio.c
index 77e4715..4e1aec3 100644
--- a/sys/v4l2/gstv4l2radio.c
+++ b/sys/v4l2/gstv4l2radio.c
@@ -86,7 +86,7 @@ gst_v4l2radio_fill_channel_list (GstV4l2Radio * radio)
 
   memset (&vc, 0, sizeof (vc));
 
-  res = v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &vc);
+  res = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &vc);
   if (res < 0)
     goto caps_failed;
 
@@ -102,7 +102,7 @@ gst_v4l2radio_fill_channel_list (GstV4l2Radio * radio)
   memset (&vtun, 0, sizeof (vtun));
   vtun.index = 0;
 
-  res = v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun);
+  res = v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun);
   if (res < 0)
     goto tuner_failed;
 
diff --git a/sys/v4l2/gstv4l2sink.c b/sys/v4l2/gstv4l2sink.c
index 3295947..c77227c 100644
--- a/sys/v4l2/gstv4l2sink.c
+++ b/sys/v4l2/gstv4l2sink.c
@@ -246,16 +246,16 @@ gst_v4l2sink_sync_overlay_fields (GstV4l2Sink * v4l2sink)
 
   if (GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
 
-    gint fd = v4l2sink->v4l2object->video_fd;
+    GstV4l2Object *obj = v4l2sink->v4l2object;
     struct v4l2_format format;
 
     memset (&format, 0x00, sizeof (struct v4l2_format));
-    if (v4l2sink->v4l2object->device_caps & V4L2_CAP_VIDEO_OUTPUT_OVERLAY)
+    if (obj->device_caps & V4L2_CAP_VIDEO_OUTPUT_OVERLAY)
       format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY;
     else
       format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
 
-    if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0) {
+    if (obj->ioctl (obj->video_fd, VIDIOC_G_FMT, &format) < 0) {
       GST_WARNING_OBJECT (v4l2sink, "VIDIOC_G_FMT failed");
       return;
     }
@@ -275,7 +275,7 @@ gst_v4l2sink_sync_overlay_fields (GstV4l2Sink * v4l2sink)
     if (v4l2sink->overlay_fields_set & RECT_HEIGHT_SET)
       format.fmt.win.w.height = v4l2sink->overlay.height;
 
-    if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
+    if (obj->ioctl (obj->video_fd, VIDIOC_S_FMT, &format) < 0) {
       GST_WARNING_OBJECT (v4l2sink, "VIDIOC_S_FMT failed");
       return;
     }
@@ -293,13 +293,13 @@ gst_v4l2sink_sync_crop_fields (GstV4l2Sink * v4l2sink)
 
   if (GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
 
-    gint fd = v4l2sink->v4l2object->video_fd;
+    GstV4l2Object *obj = v4l2sink->v4l2object;
     struct v4l2_crop crop;
 
     memset (&crop, 0x00, sizeof (struct v4l2_crop));
     crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 
-    if (v4l2_ioctl (fd, VIDIOC_G_CROP, &crop) < 0) {
+    if (obj->ioctl (obj->video_fd, VIDIOC_G_CROP, &crop) < 0) {
       GST_WARNING_OBJECT (v4l2sink, "VIDIOC_G_CROP failed");
       return;
     }
@@ -319,12 +319,12 @@ gst_v4l2sink_sync_crop_fields (GstV4l2Sink * v4l2sink)
     if (v4l2sink->crop_fields_set & RECT_HEIGHT_SET)
       crop.c.height = v4l2sink->crop.height;
 
-    if (v4l2_ioctl (fd, VIDIOC_S_CROP, &crop) < 0) {
+    if (obj->ioctl (obj->video_fd, VIDIOC_S_CROP, &crop) < 0) {
       GST_WARNING_OBJECT (v4l2sink, "VIDIOC_S_CROP failed");
       return;
     }
 
-    if (v4l2_ioctl (fd, VIDIOC_G_CROP, &crop) < 0) {
+    if (obj->ioctl (obj->video_fd, VIDIOC_G_CROP, &crop) < 0) {
       GST_WARNING_OBJECT (v4l2sink, "VIDIOC_G_CROP failed");
       return;
     }
diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
index 807a3a7..b445e5c 100644
--- a/sys/v4l2/gstv4l2src.c
+++ b/sys/v4l2/gstv4l2src.c
@@ -38,6 +38,10 @@
  * ]| This pipeline shows the video captured from a webcam that delivers jpeg
  * images.
  * </refsect2>
+ *
+ * Since 1.14, the use of libv4l2 has been disabled due to major bugs in the
+ * emulation layer. To enable usage of this library, set the environment
+ * variable GST_V4L2_USE_LIBV4L2=1.
  */
 
 #ifdef HAVE_CONFIG_H
diff --git a/sys/v4l2/gstv4l2videodec.c b/sys/v4l2/gstv4l2videodec.c
index 1550c46..4a65002 100644
--- a/sys/v4l2/gstv4l2videodec.c
+++ b/sys/v4l2/gstv4l2videodec.c
@@ -311,7 +311,7 @@ gst_v4l2_decoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
 
   dcmd.cmd = cmd;
   dcmd.flags = flags;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
     goto dcmd_failed;
 
   return TRUE;
diff --git a/sys/v4l2/gstv4l2videoenc.c b/sys/v4l2/gstv4l2videoenc.c
index 644141f..79949ba 100644
--- a/sys/v4l2/gstv4l2videoenc.c
+++ b/sys/v4l2/gstv4l2videoenc.c
@@ -241,7 +241,7 @@ gst_v4l2_encoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
 
   ecmd.cmd = cmd;
   ecmd.flags = flags;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0)
     goto ecmd_failed;
 
   return TRUE;
diff --git a/sys/v4l2/v4l2_calls.c b/sys/v4l2/v4l2_calls.c
index b12efe0..f52bd99 100644
--- a/sys/v4l2/v4l2_calls.c
+++ b/sys/v4l2/v4l2_calls.c
@@ -68,7 +68,8 @@ gst_v4l2_get_capabilities (GstV4l2Object * v4l2object)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP, &v4l2object->vcap) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCAP,
+          &v4l2object->vcap) < 0)
     goto cap_failed;
 
   if (v4l2object->vcap.capabilities & V4L2_CAP_DEVICE_CAPS)
@@ -147,7 +148,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     memset (&input, 0, sizeof (input));
 
     input.index = n;
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMINPUT, &input) < 0) {
       if (errno == EINVAL || errno == ENOTTY)
         break;                  /* end of enumeration */
       else {
@@ -181,7 +182,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
       channel->flags |= GST_TUNER_CHANNEL_FREQUENCY;
 
       vtun.index = input.tuner;
-      if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &vtun) < 0) {
+      if (v4l2object->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);
@@ -222,7 +223,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     standard.frameperiod.denominator = 0;
     standard.index = n;
 
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENUMSTD, &standard) < 0) {
       if (errno == EINVAL || errno == ENOTTY)
         break;                  /* end of enumeration */
 #ifdef ENODATA
@@ -280,7 +281,8 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
     GST_DEBUG_OBJECT (e, "checking control %08x", n);
 
     control.id = n | next;
-    if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL, &control) < 0) {
+    if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYCTRL,
+            &control) < 0) {
       if (next) {
         if (n > 0) {
           GST_DEBUG_OBJECT (e, "controls finished");
@@ -405,7 +407,8 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
       menu.id = n;
       for (i = 0;; i++) {
         menu.index = i;
-        if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU, &menu) < 0) {
+        if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_QUERYMENU,
+                &menu) < 0) {
           if (errno == EINVAL)
             break;              /* end of enumeration */
           else {
@@ -515,7 +518,7 @@ gboolean
 gst_v4l2_open (GstV4l2Object * v4l2object)
 {
   struct stat st;
-  int libv4l2_fd;
+  int libv4l2_fd = -1;
 
   GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
       v4l2object->videodev);
@@ -541,8 +544,12 @@ 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);
+#ifdef HAVE_LIBV4L2
+  if (v4l2object->fd_open)
+    libv4l2_fd = v4l2object->fd_open (v4l2object->video_fd,
+        V4L2_ENABLE_ENUM_FMT_EMULATION);
+#endif
+
   /* 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
@@ -651,7 +658,7 @@ error:
   {
     if (GST_V4L2_IS_OPEN (v4l2object)) {
       /* close device */
-      v4l2_close (v4l2object->video_fd);
+      v4l2object->close (v4l2object->video_fd);
       v4l2object->video_fd = -1;
     }
     /* empty lists */
@@ -676,7 +683,7 @@ gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other)
   v4l2object->device_caps = other->device_caps;
   gst_v4l2_adjust_buf_type (v4l2object);
 
-  v4l2object->video_fd = v4l2_dup (other->video_fd);
+  v4l2object->video_fd = v4l2object->dup (other->video_fd);
   if (!GST_V4L2_IS_OPEN (v4l2object))
     goto not_open;
 
@@ -717,7 +724,7 @@ gst_v4l2_close (GstV4l2Object * v4l2object)
   GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
 
   /* close device */
-  v4l2_close (v4l2object->video_fd);
+  v4l2object->close (v4l2object->video_fd);
   v4l2object->video_fd = -1;
 
   /* empty lists */
@@ -740,7 +747,7 @@ gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_STD, norm) < 0)
     goto std_failed;
 
   return TRUE;
@@ -769,7 +776,7 @@ gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_STD, &norm) < 0)
     goto std_failed;
 
   return TRUE;
@@ -805,7 +812,7 @@ gst_v4l2_get_frequency (GstV4l2Object * v4l2object,
   channel = gst_tuner_get_channel (GST_TUNER (v4l2object->element));
 
   freq.tuner = tunernum;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq) < 0)
     goto freq_failed;
 
   *frequency = freq.frequency * channel->freq_multiplicator;
@@ -846,10 +853,10 @@ gst_v4l2_set_frequency (GstV4l2Object * v4l2object,
 
   freq.tuner = tunernum;
   /* fill in type - ignore error */
-  (void) v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
+  (void) v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_FREQUENCY, &freq);
   freq.frequency = frequency / channel->freq_multiplicator;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_FREQUENCY, &freq) < 0)
     goto freq_failed;
 
   return TRUE;
@@ -881,7 +888,7 @@ gst_v4l2_signal_strength (GstV4l2Object * v4l2object,
     return FALSE;
 
   tuner.index = tunernum;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_TUNER, &tuner) < 0)
     goto tuner_failed;
 
   *signal_strength = tuner.signal;
@@ -917,7 +924,7 @@ gst_v4l2_get_attribute (GstV4l2Object * v4l2object,
 
   control.id = attribute_num;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
     goto ctrl_failed;
 
   *value = control.value;
@@ -954,7 +961,7 @@ gst_v4l2_set_attribute (GstV4l2Object * v4l2object,
 
   control.id = attribute_num;
   control.value = value;
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0)
     goto ctrl_failed;
 
   return TRUE;
@@ -1027,7 +1034,7 @@ gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_INPUT, &n) < 0)
     goto input_failed;
 
   *input = n;
@@ -1056,7 +1063,7 @@ gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_INPUT, &input) < 0)
     goto input_failed;
 
   return TRUE;
@@ -1084,7 +1091,7 @@ gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_OUTPUT, &n) < 0)
     goto output_failed;
 
   *output = n;
@@ -1113,7 +1120,7 @@ gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output)
   if (!GST_V4L2_IS_OPEN (v4l2object))
     return FALSE;
 
-  if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
+  if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_OUTPUT, &output) < 0)
     goto output_failed;
 
   return TRUE;
-- 
2.7.4