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(Camera V4L2) Implement init_userp

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This commit is contained in:
twinaphex 2013-11-10 03:27:17 +01:00
parent fc65ae7709
commit 577bf02323
1 changed files with 54 additions and 1 deletions
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55
camera/video4linux2.c
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@ -280,6 +280,59 @@ static int init_mmap(void *data)
return 0;
}
static int init_userp(void *data, unsigned int buffer_size)
{
struct v4l2_requestbuffers req;
unsigned int page_size;
video4linux_t *v4l = (video4linux_t*)data;
page_size = getpagesize();
buffer_size = (buffer_size + page_size - 1) & ~(page_size - 1);
memset (&(req), 0, sizeof (req));
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_USERPTR;
if (xioctl(v4l->fd, VIDIOC_REQBUFS, &req) == -1)
{
if (errno == EINVAL)
{
RARCH_ERR("%s does not support user pointer I/O\n", v4l->dev_name);
return -1;
}
else
{
RARCH_ERR("VIDIOC_REQBUFS.\n");
return -1;
}
}
v4l->buffers = calloc(4, sizeof(*v4l->buffers));
if (!v4l->buffers)
{
RARCH_ERR("Out of memory\n");
return -1;
}
for (v4l->n_buffers = 0; v4l->n_buffers < 4; ++v4l->n_buffers)
{
v4l->buffers[v4l->n_buffers].length = buffer_size;
v4l->buffers[v4l->n_buffers].start = memalign( /* boundary */ page_size,
buffer_size);
if (!v4l->buffers[v4l->n_buffers].start)
{
RARCH_ERR("Out of memory\n");
return -1;
}
}
return 0;
}
static int init_device(void *data)
{
struct v4l2_capability cap;
@ -393,7 +446,7 @@ static int init_device(void *data)
case IO_METHOD_MMAP:
return init_mmap(v4l);
case IO_METHOD_USERPTR:
//init_userp(fmt.fmt.pix.sizeimage);
init_userp(v4l, fmt.fmt.pix.sizeimage);
break;
}