GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_dmabufin (GstV4l2Allocator * allocator)
{
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_DMABUF, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
GST_LOG_OBJECT (allocator, "allocating empty DMABUF import group");
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] == NULL) {
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, 0, 0, 0, 0, i, NULL, -1, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
}
gst_v4l2_allocator_clear_dmabufin (allocator, group);
return group;
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_mmap (GstV4l2Allocator * allocator)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_MMAP, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] == NULL) {
gpointer data;
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;
GST_LOG_OBJECT (allocator,
"mmap buffer length %d, data offset %d, plane %d",
group->planes[i].length, group->planes[i].data_offset, i);
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, group->planes[i].length, 0, 0, group->planes[i].length, i, data,
-1, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
}
/* Ensure group size. Unlike GST, v4l2 have size (bytesused) initially set
* to 0. As length might be bigger then the expected size exposed in the
* format, we simply set bytesused initially and reset it here for
* simplicity */
gst_v4l2_allocator_reset_size (allocator, group);
return group;
mmap_failed:
{
GST_ERROR_OBJECT (allocator, "Failed to mmap buffer: %s",
g_strerror (errno));
_cleanup_failed_alloc (allocator, group);
return NULL;
}
}
static GstV4l2Memory *
_v4l2mem_share (GstV4l2Memory * mem, gssize offset, gsize size)
{
GstV4l2Memory *sub;
GstMemory *parent;
/* find the real parent */
if ((parent = mem->mem.parent) == NULL)
parent = (GstMemory *) mem;
if (size == -1)
size = mem->mem.size - offset;
/* the shared memory is always readonly */
sub = _v4l2mem_new (GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, mem->mem.allocator, parent,
mem->mem.maxsize, mem->mem.align, offset, size, mem->plane, mem->data,
-1, mem->group);
return sub;
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_dmabuf (GstV4l2Allocator * allocator,
GstAllocator * dmabuf_allocator)
{
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_MMAP, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
for (i = 0; i < group->n_mem; i++) {
GstV4l2Memory *mem;
GstMemory *dma_mem;
gint dmafd;
if (group->mem[i] == NULL) {
struct v4l2_exportbuffer expbuf = { 0 };
expbuf.type = allocator->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)
goto expbuf_failed;
GST_LOG_OBJECT (allocator, "exported DMABUF as fd %i plane %d",
expbuf.fd, i);
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, group->planes[i].length, 0, 0, group->planes[i].length, i,
NULL, expbuf.fd, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
g_assert (gst_is_v4l2_memory (group->mem[i]));
mem = (GstV4l2Memory *) group->mem[i];
if ((dmafd = dup (mem->dmafd)) < 0)
goto dup_failed;
dma_mem = gst_dmabuf_allocator_alloc (dmabuf_allocator, dmafd,
mem->mem.maxsize);
gst_mini_object_set_qdata (GST_MINI_OBJECT (dma_mem),
GST_V4L2_MEMORY_QUARK, mem, (GDestroyNotify) gst_memory_unref);
group->mem[i] = dma_mem;
group->mems_allocated++;
}
gst_v4l2_allocator_reset_size (allocator, group);
return group;
expbuf_failed:
{
GST_ERROR_OBJECT (allocator, "Failed to export DMABUF: %s",
g_strerror (errno));
goto cleanup;
}
dup_failed:
{
GST_ERROR_OBJECT (allocator, "Failed to dup DMABUF descriptor: %s",
g_strerror (errno));
goto cleanup;
}
cleanup:
{
_cleanup_failed_alloc (allocator, group);
return NULL;
}
}