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Stick to mmap() in v4l2.

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Avoids really bloated code. Shouldn't become a problem.
This commit is contained in:
Themaister 2013-11-12 14:35:37 +01:00
parent ec2f91f19e
commit 6f09f4b8e0
1 changed files with 63 additions and 315 deletions
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378
camera/video4linux2.c
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@ -35,13 +35,6 @@
#include <linux/videodev2.h>
typedef enum
{
IO_METHOD_READ,
IO_METHOD_MMAP,
IO_METHOD_USERPTR,
} io_method;
struct buffer
{
void *start;
@ -53,7 +46,6 @@ typedef struct video4linux
char dev_name[256];
int fd;
bool ready;
io_method io;
struct buffer *buffers;
unsigned n_buffers;
size_t width;
@ -166,29 +158,6 @@ static int xioctl(int fd, int request, void *args)
return r;
}
static int init_read(void *data, unsigned int buffer_size)
{
video4linux_t *v4l = (video4linux_t*)data;
v4l->buffers = (struct buffer*)calloc(1, sizeof(*v4l->buffers));
if (!v4l->buffers)
{
RARCH_ERR("Out of memory allocating V4L2 buffers.\n");
return -1;
}
v4l->buffers[0].length = buffer_size;
v4l->buffers[0].start = malloc(buffer_size);
if (!v4l->buffers[0].start)
{
RARCH_ERR("Out of memory allocating V4L2 buffers.\n");
return -1;
}
return 0;
}
static int init_mmap(void *data)
{
struct v4l2_requestbuffers req;
@ -260,66 +229,13 @@ 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;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format fmt;
unsigned int min;
unsigned min;
video4linux_t *v4l = (video4linux_t*)data;
if (xioctl(v4l->fd, VIDIOC_QUERYCAP, &cap) == -1)
@ -342,31 +258,15 @@ static int init_device(void *data)
return -1;
}
switch (v4l->io)
if (!(cap.capabilities & V4L2_CAP_STREAMING))
{
case IO_METHOD_READ:
if (!(cap.capabilities & V4L2_CAP_READWRITE))
{
RARCH_ERR("%s does not support read I/O (V4L2_CAP_READWRITE).\n", v4l->dev_name);
return -1;
}
break;
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
if (!(cap.capabilities & V4L2_CAP_STREAMING))
{
RARCH_ERR("%s does not support streaming I/O (V4L2_CAP_STREAMING).\n", v4l->dev_name);
return -1;
}
break;
RARCH_ERR("%s does not support streaming I/O (V4L2_CAP_STREAMING).\n", v4l->dev_name);
return -1;
}
/* Select video input, video standard and tune here. */
memset (&(cropcap), 0, sizeof (cropcap));
memset(&cropcap, 0, sizeof(cropcap));
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@ -394,6 +294,7 @@ static int init_device(void *data)
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = v4l->width;
fmt.fmt.pix.height = v4l->height;
// TODO: See if we can use a saner format here.
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
@ -419,18 +320,7 @@ static int init_device(void *data)
if (fmt.fmt.pix.height != v4l->height)
v4l->height = fmt.fmt.pix.height;
switch (v4l->io)
{
case IO_METHOD_READ:
return init_read(v4l, fmt.fmt.pix.sizeimage);
case IO_METHOD_MMAP:
return init_mmap(v4l);
case IO_METHOD_USERPTR:
init_userp(v4l, fmt.fmt.pix.sizeimage);
break;
}
return 0;
return init_mmap(v4l);
}
static int v4l_stop(void *data)
@ -438,101 +328,50 @@ static int v4l_stop(void *data)
enum v4l2_buf_type type;
video4linux_t *v4l = (video4linux_t*)data;
switch (v4l->io)
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMOFF, &type) == -1)
{
case IO_METHOD_READ:
/* Nothing to do. */
break;
case IO_METHOD_MMAP:
case IO_METHOD_USERPTR:
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMOFF, &type) == -1)
{
RARCH_ERR("Error - VIDIOC_STREAMOFF.\n");
return -1;
}
break;
RARCH_ERR("Error - VIDIOC_STREAMOFF.\n");
return -1;
}
v4l->ready = false;
return 0;
}
static int v4l_start(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
unsigned int i;
unsigned i;
enum v4l2_buf_type type;
switch (v4l->io)
for (i = 0; i < v4l->n_buffers; i++)
{
case IO_METHOD_READ:
/* Nothing to do. */
break;
struct v4l2_buffer buf;
case IO_METHOD_MMAP:
for (i = 0; i < v4l->n_buffers; i++)
{
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
{
RARCH_ERR("Error - VIDIOC_QBUF.\n");
return -1;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMON, &type) == -1)
{
RARCH_ERR("Error - VIDIOC_STREAMON.\n");
return -1;
}
break;
case IO_METHOD_USERPTR:
for (i = 0; i < v4l->n_buffers; i++)
{
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
buf.index = i;
buf.m.userptr = (unsigned long)v4l->buffers[i].start;
buf.length = v4l->buffers[i].length;
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
{
RARCH_ERR("Error - VIDIOC_QBUF.\n");
return -1;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMON, &type) == -1)
{
RARCH_ERR("Error - VIDIOC_STREAMON.\n");
return -1;
}
break;
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
{
RARCH_ERR("Error - VIDIOC_QBUF.\n");
return -1;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMON, &type) == -1)
{
RARCH_ERR("Error - VIDIOC_STREAMON.\n");
return -1;
}
generate_YCbCr_to_RGB_lookup();
v4l->ready = true;
return 0;
@ -577,19 +416,14 @@ static void *v4l_init(const char *device, unsigned width, unsigned height)
goto error;
}
v4l->io = IO_METHOD_MMAP;
if (init_device(v4l) == -1)
goto error;
generate_YCbCr_to_RGB_lookup();
return v4l;
error:
RARCH_ERR("V4L2: Failed to initialize camera.\n");
if (v4l)
free(v4l);
free(v4l);
return NULL;
}
@ -597,31 +431,13 @@ static void v4l_free(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
unsigned int i;
unsigned i;
for (i = 0; i < v4l->n_buffers; i++)
if (munmap(v4l->buffers[i].start, v4l->buffers[i].length) == -1)
RARCH_ERR("munmap failed.\n");
switch (v4l->io)
{
case IO_METHOD_READ:
free(v4l->buffers[0].start);
break;
case IO_METHOD_MMAP:
for (i = 0; i < v4l->n_buffers; i++)
if (munmap(v4l->buffers[i].start, v4l->buffers[i].length) == -1)
{
RARCH_ERR("munmap failed.\n");
return;
}
break;
case IO_METHOD_USERPTR:
for (i = 0; i < v4l->n_buffers; i++)
free(v4l->buffers[i].start);
break;
}
if (close(v4l->fd) == -1)
RARCH_ERR("close of file descriptor failed.\n");
v4l->fd = -1;
if (v4l->fd >= 0)
close(v4l->fd);
free(v4l);
// Assumes one instance. LUT will be gone at some point anyways.
@ -635,102 +451,34 @@ static void preprocess_image(void *data)
struct v4l2_buffer buf;
unsigned i;
switch (v4l->io)
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (xioctl(v4l->fd, VIDIOC_DQBUF, &buf) == -1)
{
case IO_METHOD_READ:
if (read(v4l->fd, v4l->buffers[0].start, v4l->buffers[0].length) == -1)
{
switch (errno)
{
case EAGAIN:
return;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
return;
}
}
process_image(v4l->buffers[0].start);
break;
case IO_METHOD_MMAP:
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (xioctl(v4l->fd, VIDIOC_DQBUF, &buf) == -1)
{
switch (errno)
{
case EAGAIN:
return;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
RARCH_ERR("VIDIOC_DQBUF.\n");
return;
}
}
assert(buf.index < v4l->n_buffers);
process_image(v4l->buffers[buf.index].start);
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
{
RARCH_ERR("VIDIOC_QBUF\n");
switch (errno)
{
case EAGAIN:
return;
}
case EIO:
/* Could ignore EIO, see spec. */
break;
/* fall through */
case IO_METHOD_USERPTR:
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_USERPTR;
if (xioctl(v4l->fd, VIDIOC_DQBUF, &buf) == -1)
{
switch (errno)
{
case EAGAIN:
return;
case EIO:
/* Could ignore EIO, see spec. */
/* fall through */
default:
RARCH_ERR("VIDIOC_DQBUF.\n");
return;
}
}
for (i = 0; i < v4l->n_buffers; i++)
if (buf.m.userptr == (unsigned long)v4l->buffers[i].start
&& buf.length == v4l->buffers[i].length)
break;
assert(i < v4l->n_buffers);
process_image((void *)buf.m.userptr);
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
RARCH_ERR("VIDIOC_QBUF.\n");
break;
default:
RARCH_ERR("VIDIOC_DQBUF.\n");
return;
}
}
assert(buf.index < v4l->n_buffers);
process_image(v4l->buffers[buf.index].start);
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
RARCH_ERR("VIDIOC_QBUF\n");
}
static void v4l_texture_image_2d(void *data)