Ejemplos de gst_v4l2_memory_group_new en C++ (Cpp)

Ejemplo n.º 1

Archivo: gstv4l2allocator.c Proyecto: nnikos123/gst-plugins-good

static GstV4l2MemoryGroup *
gst_v4l2_allocator_create_buf (GstV4l2Allocator * allocator)
{
  GstV4l2Object *obj = allocator->obj;
  struct v4l2_create_buffers bcreate = { 0 };
  GstV4l2MemoryGroup *group = NULL;

  GST_OBJECT_LOCK (allocator);

  if (!g_atomic_int_get (&allocator->active))
    goto done;

  bcreate.memory = allocator->memory;
  bcreate.format = obj->format;
  bcreate.count = 1;

  if (!allocator->can_allocate)
    goto done;

  if (obj->ioctl (obj->video_fd, VIDIOC_CREATE_BUFS, &bcreate) < 0)
    goto create_bufs_failed;

  if (allocator->groups[bcreate.index] != NULL)
    goto create_bufs_bug;

  group = gst_v4l2_memory_group_new (allocator, bcreate.index);

  if (group) {
    allocator->groups[bcreate.index] = group;
    allocator->count++;
  }

done:
  GST_OBJECT_UNLOCK (allocator);
  return group;

create_bufs_failed:
  {
    GST_WARNING_OBJECT (allocator, "error creating a new buffer: %s",
        g_strerror (errno));
    goto done;
  }
create_bufs_bug:
  {
    GST_ERROR_OBJECT (allocator, "created buffer has already used buffer "
        "index %i, this means there is an bug in your driver or libv4l2",
        bcreate.index);
    goto done;
  }
}

Ejemplo n.º 2

Archivo: gstv4l2allocator.c Proyecto: BigBrother-International/gst-plugins-good

guint
gst_v4l2_allocator_start (GstV4l2Allocator * allocator, guint32 count,
    guint32 memory)
{
  struct v4l2_requestbuffers breq = { count, allocator->type, memory };
  gboolean can_allocate;
  gint i;

  g_return_val_if_fail (count != 0, 0);

  GST_OBJECT_LOCK (allocator);

  if (g_atomic_int_get (&allocator->active))
    goto already_active;

  if (v4l2_ioctl (allocator->video_fd, VIDIOC_REQBUFS, &breq) < 0)
    goto reqbufs_failed;

  if (breq.count < 1)
    goto out_of_memory;

  switch (memory) {
    case V4L2_MEMORY_MMAP:
      can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, MMAP);
      break;
    case V4L2_MEMORY_USERPTR:
      can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, USERPTR);
      break;
    case V4L2_MEMORY_DMABUF:
      can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, DMABUF);
      break;
    default:
      can_allocate = FALSE;
      break;
  }

  GST_DEBUG_OBJECT (allocator, "allocated %u %s buffers out of %u requested",
      breq.count, memory_type_to_str (memory), count);

  allocator->can_allocate = can_allocate;
  allocator->count = breq.count;
  allocator->memory = memory;

  /* Create memory groups */
  for (i = 0; i < allocator->count; i++) {
    allocator->groups[i] = gst_v4l2_memory_group_new (allocator, i);
    if (allocator->groups[i] == NULL)
      goto error;

    gst_atomic_queue_push (allocator->free_queue, allocator->groups[i]);
  }

  g_atomic_int_set (&allocator->active, TRUE);

done:
  GST_OBJECT_UNLOCK (allocator);
  return breq.count;

already_active:
  {
    GST_ERROR_OBJECT (allocator, "allocator already active");
    goto error;
  }
reqbufs_failed:
  {
    GST_ERROR_OBJECT (allocator,
        "error requesting %d buffers: %s", count, g_strerror (errno));
    goto error;
  }
out_of_memory:
  {
    GST_ERROR_OBJECT (allocator, "Not enough memory to allocate buffers");
    goto error;
  }
error:
  {
    breq.count = 0;
    goto done;
  }
}