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RetroArch/camera/video4linux2.c
twinaphex 64e77f1224 (camera) Style nits
2014-09-13 02:27:34 +02:00

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2014 - Daniel De Matteis
* Copyright (C) 2012-2014 - Michael Lelli
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <assert.h>
#include <stddef.h>
#include "../general.h"
#include "../driver.h"
#include "../performance.h"
#include "../miscellaneous.h"
#include "../gfx/scaler/scaler.h"
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "../compat/strl.h"
#include <asm/types.h>
#include <linux/videodev2.h>
struct buffer
{
void *start;
size_t length;
};
typedef struct video4linux
{
int fd;
struct buffer *buffers;
unsigned n_buffers;
unsigned width;
unsigned height;
size_t pitch;
struct scaler_ctx scaler;
uint32_t *buffer_output;
bool ready;
char dev_name[PATH_MAX];
} video4linux_t;
static void process_image(video4linux_t *v4l,
const uint8_t *buffer_yuv)
{
RARCH_PERFORMANCE_INIT(yuv_convert_direct);
RARCH_PERFORMANCE_START(yuv_convert_direct);
scaler_ctx_scale(&v4l->scaler, v4l->buffer_output, buffer_yuv);
RARCH_PERFORMANCE_STOP(yuv_convert_direct);
}
static int xioctl(int fd, int request, void *args)
{
int r;
do
{
r = ioctl(fd, request, args);
} while (r == -1 && errno == EINTR);
return r;
}
static bool init_mmap(void *data)
{
struct v4l2_requestbuffers req;
video4linux_t *v4l = (video4linux_t*)data;
memset(&req, 0, sizeof(req));
req.count = 4;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (xioctl(v4l->fd, VIDIOC_REQBUFS, &req) == -1)
{
if (errno == EINVAL)
RARCH_ERR("%s does not support memory mapping.\n", v4l->dev_name);
else
RARCH_ERR("xioctl of VIDIOC_REQBUFS failed.\n");
return false;
}
if (req.count < 2)
{
RARCH_ERR("Insufficient buffer memory on %s.\n", v4l->dev_name);
return false;
}
v4l->buffers = (struct buffer*)calloc(req.count, sizeof(*v4l->buffers));
if (!v4l->buffers)
{
RARCH_ERR("Out of memory allocating V4L2 buffers.\n");
return false;
}
for (v4l->n_buffers = 0; v4l->n_buffers < req.count; v4l->n_buffers++)
{
struct v4l2_buffer buf;
memset(&buf, 0, sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = v4l->n_buffers;
if (xioctl(v4l->fd, VIDIOC_QUERYBUF, &buf) == -1)
{
RARCH_ERR("Error - xioctl VIDIOC_QUERYBUF.\n");
return false;
}
v4l->buffers[v4l->n_buffers].length = buf.length;
v4l->buffers[v4l->n_buffers].start = mmap(NULL,
buf.length, PROT_READ | PROT_WRITE,
MAP_SHARED,
v4l->fd, buf.m.offset);
if (v4l->buffers[v4l->n_buffers].start == MAP_FAILED)
{
RARCH_ERR("Error - mmap.\n");
return false;
}
}
return true;
}
static bool init_device(void *data)
{
struct v4l2_capability cap;
struct v4l2_cropcap cropcap;
struct v4l2_crop crop;
struct v4l2_format fmt;
video4linux_t *v4l = (video4linux_t*)data;
if (xioctl(v4l->fd, VIDIOC_QUERYCAP, &cap) < 0)
{
if (errno == EINVAL)
RARCH_ERR("%s is no V4L2 device.\n", v4l->dev_name);
else
RARCH_ERR("Error - VIDIOC_QUERYCAP.\n");
return false;
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
{
RARCH_ERR("%s is no video capture device.\n", v4l->dev_name);
return false;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING))
{
RARCH_ERR("%s does not support streaming I/O (V4L2_CAP_STREAMING).\n",
v4l->dev_name);
return false;
}
memset(&cropcap, 0, sizeof(cropcap));
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_CROPCAP, &cropcap) == 0)
{
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
crop.c = cropcap.defrect;
/* Ignore errors here. */
xioctl(v4l->fd, VIDIOC_S_CROP, &crop);
}
memset(&fmt, 0, sizeof(fmt));
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.width = v4l->width;
fmt.fmt.pix.height = v4l->height;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
if (xioctl(v4l->fd, VIDIOC_S_FMT, &fmt) < 0)
{
RARCH_ERR("Error - VIDIOC_S_FMT\n");
return false;
}
/* VIDIOC_S_FMT may change width, height and pitch. */
v4l->width = fmt.fmt.pix.width;
v4l->height = fmt.fmt.pix.height;
v4l->pitch = max(fmt.fmt.pix.bytesperline, v4l->width * 2);
/* Sanity check to see if our assumptions are met.
* It is possible to support whatever the device gives us,
* but this dramatically increases complexity.
*/
if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_YUYV)
{
RARCH_ERR("The V4L2 device doesn't support YUYV.\n");
return false;
}
if (fmt.fmt.pix.field != V4L2_FIELD_NONE
&& fmt.fmt.pix.field != V4L2_FIELD_INTERLACED)
{
RARCH_ERR("The V4L2 device doesn't support progressive nor interlaced video.\n");
return false;
}
RARCH_LOG("V4L2 device: %u x %u.\n", v4l->width, v4l->height);
return init_mmap(v4l);
}
static void v4l_stop(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMOFF, &type) == -1)
RARCH_ERR("Error - VIDIOC_STREAMOFF.\n");
v4l->ready = false;
}
static bool v4l_start(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
unsigned i;
enum v4l2_buf_type type;
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_MMAP;
buf.index = i;
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
{
RARCH_ERR("Error - VIDIOC_QBUF.\n");
return false;
}
}
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (xioctl(v4l->fd, VIDIOC_STREAMON, &type) == -1)
{
RARCH_ERR("Error - VIDIOC_STREAMON.\n");
return false;
}
v4l->ready = true;
return true;
}
static void v4l_free(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
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");
if (v4l->fd >= 0)
close(v4l->fd);
free(v4l->buffer_output);
scaler_ctx_gen_reset(&v4l->scaler);
free(v4l);
}
static void *v4l_init(const char *device, uint64_t caps,
unsigned width, unsigned height)
{
struct stat st;
if ((caps & (1ULL << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER)) == 0)
{
RARCH_ERR("video4linux2 returns raw framebuffers.\n");
return NULL;
}
video4linux_t *v4l = (video4linux_t*)calloc(1, sizeof(video4linux_t));
if (!v4l)
return NULL;
strlcpy(v4l->dev_name, device ? device : "/dev/video0",
sizeof(v4l->dev_name));
v4l->width = width;
v4l->height = height;
v4l->ready = false;
if (stat(v4l->dev_name, &st) == -1)
{
RARCH_ERR("Cannot identify '%s' : %d, %s\n", v4l->dev_name,
errno, strerror(errno));
goto error;
}
if (!S_ISCHR(st.st_mode))
{
RARCH_ERR("%s is no device.\n", v4l->dev_name);
goto error;
}
v4l->fd = open(v4l->dev_name, O_RDWR | O_NONBLOCK, 0);
if (v4l->fd == -1)
{
RARCH_ERR("Cannot open '%s': %d, %s\n", v4l->dev_name,
errno, strerror(errno));
goto error;
}
if (!init_device(v4l))
goto error;
v4l->buffer_output = (uint32_t*)
malloc(v4l->width * v4l->height * sizeof(uint32_t));
if (!v4l->buffer_output)
{
RARCH_ERR("Failed to allocate output buffer.\n");
goto error;
}
v4l->scaler.in_width = v4l->scaler.out_width = v4l->width;
v4l->scaler.in_height = v4l->scaler.out_height = v4l->height;
v4l->scaler.in_fmt = SCALER_FMT_YUYV;
v4l->scaler.out_fmt = SCALER_FMT_ARGB8888;
v4l->scaler.in_stride = v4l->pitch;
v4l->scaler.out_stride = v4l->width * 4;
if (!scaler_ctx_gen_filter(&v4l->scaler))
{
RARCH_ERR("Failed to create scaler.\n");
goto error;
}
return v4l;
error:
RARCH_ERR("V4L2: Failed to initialize camera.\n");
v4l_free(v4l);
return NULL;
}
static bool preprocess_image(void *data)
{
video4linux_t *v4l = (video4linux_t*)data;
struct v4l2_buffer buf;
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 false;
default:
RARCH_ERR("VIDIOC_DQBUF.\n");
return false;
}
}
rarch_assert(buf.index < v4l->n_buffers);
process_image(v4l, (const uint8_t*)v4l->buffers[buf.index].start);
if (xioctl(v4l->fd, VIDIOC_QBUF, &buf) == -1)
RARCH_ERR("VIDIOC_QBUF\n");
return true;
}
static bool v4l_poll(void *data,
retro_camera_frame_raw_framebuffer_t frame_raw_cb,
retro_camera_frame_opengl_texture_t frame_gl_cb)
{
video4linux_t *v4l = (video4linux_t*)data;
if (!v4l->ready)
return false;
(void)frame_gl_cb;
if (preprocess_image(data))
{
if (frame_raw_cb != NULL)
frame_raw_cb(v4l->buffer_output, v4l->width,
v4l->height, v4l->width * 4);
return true;
}
return false;
}
camera_driver_t camera_v4l2 = {
v4l_init,
v4l_free,
v4l_start,
v4l_stop,
v4l_poll,
"video4linux2",
};
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