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/**
* @file v4l.c Video4Linux video-source
*
* Copyright (C) 2010 Creytiv.com
*/
#define _BSD_SOURCE 1
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#undef __STRICT_ANSI__ /* needed for RHEL4 kernel 2.6.9 */
#include <libv4l1-videodev.h>
#include <pthread.h>
#include <re.h>
#include <rem.h>
#include <baresip.h>
/**
* @defgroup v4l v4l
*
* Video4Linux video-source module
*/
struct vidsrc_st {
const struct vidsrc *vs; /* inheritance */
int fd;
pthread_t thread;
bool run;
struct vidsz size;
struct mbuf *mb;
vidsrc_frame_h *frameh;
void *arg;
};
static struct vidsrc *vidsrc;
static void v4l_get_caps(struct vidsrc_st *st)
{
struct video_capability caps;
if (-1 == ioctl(st->fd, VIDIOCGCAP, &caps)) {
warning("v4l: VIDIOCGCAP: %m\n", errno);
return;
}
info("v4l: video: \"%s\" (%ux%u) - (%ux%u)\n", caps.name,
caps.minwidth, caps.minheight,
caps.maxwidth, caps.maxheight);
if (VID_TYPE_CAPTURE != caps.type) {
warning("v4l: not a capture device (%d)\n", caps.type);
}
}
static int v4l_check_palette(struct vidsrc_st *st)
{
struct video_picture pic;
if (-1 == ioctl(st->fd, VIDIOCGPICT, &pic)) {
warning("v4l: VIDIOCGPICT: %m\n", errno);
return errno;
}
if (VIDEO_PALETTE_RGB24 != pic.palette) {
warning("v4l: unsupported palette %d (only RGB24 supp.)\n",
pic.palette);
return ENODEV;
}
return 0;
}
static int v4l_get_win(int fd, int width, int height)
{
struct video_window win;
if (-1 == ioctl(fd, VIDIOCGWIN, &win)) {
warning("v4l: VIDIOCGWIN: %m\n", errno);
return errno;
}
info("v4l: video window: x,y=%u,%u (%u x %u)\n",
win.x, win.y, win.width, win.height);
win.width = width;
win.height = height;
if (-1 == ioctl(fd, VIDIOCSWIN, &win)) {
warning("v4l: VIDIOCSWIN: %m\n", errno);
return errno;
}
return 0;
}
static void call_frame_handler(struct vidsrc_st *st, uint8_t *buf)
{
struct vidframe frame;
vidframe_init_buf(&frame, VID_FMT_RGB32, &st->size, buf);
st->frameh(&frame, st->arg);
}
static void *read_thread(void *arg)
{
struct vidsrc_st *st = arg;
while (st->run) {
ssize_t n;
n = read(st->fd, st->mb->buf, st->mb->size);
if ((ssize_t)st->mb->size != n) {
warning("v4l: video read: %d -> %d bytes\n",
st->mb->size, n);
continue;
}
call_frame_handler(st, st->mb->buf);
}
return NULL;
}
static int vd_open(struct vidsrc_st *v4l, const char *device)
{
/* NOTE: with kernel 2.6.26 it takes ~2 seconds to open
* the video device.
*/
v4l->fd = open(device, O_RDWR);
if (v4l->fd < 0) {
warning("v4l: open %s: %m\n", device, errno);
return errno;
}
return 0;
}
static void destructor(void *arg)
{
struct vidsrc_st *st = arg;
if (st->run) {
st->run = false;
pthread_join(st->thread, NULL);
}
if (st->fd >= 0)
close(st->fd);
mem_deref(st->mb);
}
static uint32_t rgb24_size(const struct vidsz *sz)
{
return sz ? (sz->w * sz->h * 24/8) : 0;
}
static int alloc(struct vidsrc_st **stp, const struct vidsrc *vs,
struct media_ctx **ctx, struct vidsrc_prm *prm,
const struct vidsz *size, const char *fmt,
const char *dev, vidsrc_frame_h *frameh,
vidsrc_error_h *errorh, void *arg)
{
struct vidsrc_st *st;
int err;
(void)ctx;
(void)prm;
(void)fmt;
(void)errorh;
if (!stp || !size || !frameh)
return EINVAL;
if (!str_isset(dev))
dev = "/dev/video0";
st = mem_zalloc(sizeof(*st), destructor);
if (!st)
return ENOMEM;
st->vs = vs;
st->fd = -1;
st->size = *size;
st->frameh = frameh;
st->arg = arg;
info("v4l: open: %s (%u x %u)\n", dev, size->w, size->h);
err = vd_open(st, dev);
if (err)
goto out;
v4l_get_caps(st);
err = v4l_check_palette(st);
if (err)
goto out;
err = v4l_get_win(st->fd, st->size.w, st->size.h);
if (err)
goto out;
/* note: assumes RGB24 */
st->mb = mbuf_alloc(rgb24_size(&st->size));
if (!st->mb) {
err = ENOMEM;
goto out;
}
st->run = true;
err = pthread_create(&st->thread, NULL, read_thread, st);
if (err) {
st->run = false;
goto out;
}
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
static int v4l_init(void)
{
return vidsrc_register(&vidsrc, "v4l", alloc, NULL);
}
static int v4l_close(void)
{
vidsrc = mem_deref(vidsrc);
return 0;
}
EXPORT_SYM const struct mod_export DECL_EXPORTS(v4l) = {
"v4l",
"vidsrc",
v4l_init,
v4l_close
};
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