int v4l2_open(const char *file, int oflag, ...)
{
int fd;
/* original open code */
if (oflag & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, oflag);
mode = va_arg(ap, mode_t);
fd = SYS_OPEN(file, oflag, mode);
va_end(ap);
} else {
fd = SYS_OPEN(file, oflag, 0);
}
/* end of original open code */
if (fd == -1)
return fd;
if (v4l2_fd_open(fd, 0) == -1) {
int saved_err = errno;
SYS_CLOSE(fd);
errno = saved_err;
return -1;
}
return fd;
}
int DemuxOpen( vlc_object_t *obj )
{
demux_t *demux = (demux_t *)obj;
demux_sys_t *sys = malloc (sizeof (*sys));
if (unlikely(sys == NULL))
return VLC_ENOMEM;
demux->p_sys = sys;
ParseMRL( obj, demux->psz_location );
char *path = var_InheritString (obj, CFG_PREFIX"dev");
if (unlikely(path == NULL))
goto error; /* probably OOM */
msg_Dbg (obj, "opening device '%s'", path);
int rawfd = vlc_open (path, O_RDWR);
if (rawfd == -1)
{
msg_Err (obj, "cannot open device '%s': %m", path);
free (path);
goto error;
}
free (path);
int fd = v4l2_fd_open (rawfd, 0);
if (fd == -1)
{
msg_Warn (obj, "cannot initialize user-space library: %m");
/* fallback to direct kernel mode anyway */
fd = rawfd;
}
sys->fd = fd;
if (InitVideo (demux, fd))
{
v4l2_close (fd);
goto error;
}
sys->controls = ControlsInit (VLC_OBJECT(demux), fd);
demux->pf_demux = NULL;
demux->pf_control = DemuxControl;
demux->info.i_update = 0;
demux->info.i_title = 0;
demux->info.i_seekpoint = 0;
return VLC_SUCCESS;
error:
free (sys);
return VLC_EGENERIC;
}
LIBV4L_PUBLIC int open(const char *file, int oflag, ...)
{
int fd;
struct v4l2_capability cap;
int v4l_device = 0;
/* check if we're opening a video4linux2 device */
if (!strncmp(file, "/dev/video", 10) || !strncmp(file, "/dev/v4l/", 9)) {
/* Some apps open the device read only, but we need rw rights as the
buffers *MUST* be mapped rw */
oflag = (oflag & ~O_ACCMODE) | O_RDWR;
v4l_device = 1;
}
/* original open code */
if (oflag & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, oflag);
mode = va_arg(ap, mode_t);
fd = SYS_OPEN(file, oflag, mode);
va_end(ap);
} else {
fd = SYS_OPEN(file, oflag, 0);
}
/* end of original open code */
if (fd == -1 || !v4l_device)
return fd;
/* check that this is an v4l2 device, libv4l2 only supports v4l2 devices */
if (SYS_IOCTL(fd, VIDIOC_QUERYCAP, &cap))
return fd;
/* libv4l2 only adds functionality to capture capable devices */
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
return fd;
/* Try to Register with libv4l2 (in case of failure pass the fd to the
application as is) */
v4l2_fd_open(fd, 0);
return fd;
}
LIBV4L_PUBLIC int open(const char *file, int oflag, ...)
{
int fd;
int v4l_device = 0;
/* check if we're opening a video4linux2 device */
if (!strncmp(file, "/dev/video", 10) || !strncmp(file, "/dev/v4l/", 9)) {
/* Some apps open the device read-only, but we need rw rights as the
buffers *MUST* be mapped rw */
oflag = (oflag & ~O_ACCMODE) | O_RDWR;
v4l_device = 1;
}
/* original open code */
if (oflag & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, oflag);
mode = va_arg(ap, PROMOTED_MODE_T);
fd = SYS_OPEN(file, oflag, mode);
va_end(ap);
} else {
fd = SYS_OPEN(file, oflag, 0);
}
/* end of original open code */
if (fd == -1 || !v4l_device)
return fd;
/* Try to Register with libv4l2 (in case of failure pass the fd to the
application as is) */
v4l2_fd_open(fd, 0);
return fd;
}
/******************************************************
* gst_v4l2_open():
* open the video device (v4l2object->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_open (GstV4l2Object * v4l2object)
{
struct stat st;
int libv4l2_fd;
GstPollFD pollfd = GST_POLL_FD_INIT;
GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
v4l2object->videodev);
GST_V4L2_CHECK_NOT_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* be sure we have a device */
if (!v4l2object->videodev)
v4l2object->videodev = g_strdup ("/dev/video");
/* check if it is a device */
if (stat (v4l2object->videodev, &st) == -1)
goto stat_failed;
if (!S_ISCHR (st.st_mode))
goto no_device;
/* open the device */
v4l2object->video_fd =
open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
if (!GST_V4L2_IS_OPEN (v4l2object))
goto not_open;
libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
V4L2_ENABLE_ENUM_FMT_EMULATION);
/* Note the v4l2_xxx functions are designed so that if they get passed an
unknown fd, the will behave exactly as their regular xxx counterparts, so
if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
cam format to normal formats conversion). Chances are big we will still
fail then though, as normally v4l2_fd_open only fails if the device is not
a v4l2 device. */
if (libv4l2_fd != -1)
v4l2object->video_fd = libv4l2_fd;
v4l2object->can_poll_device = TRUE;
/* get capabilities, error will be posted */
if (!gst_v4l2_get_capabilities (v4l2object))
goto error;
/* do we need to be a capture device? */
if (GST_IS_V4L2SRC (v4l2object->element) &&
!(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
goto not_capture;
if (GST_IS_V4L2SINK (v4l2object->element) &&
!(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT))
goto not_output;
/* create enumerations, posts errors. */
if (!gst_v4l2_fill_lists (v4l2object))
goto error;
GST_INFO_OBJECT (v4l2object->element,
"Opened device '%s' (%s) successfully",
v4l2object->vcap.card, v4l2object->videodev);
pollfd.fd = v4l2object->video_fd;
gst_poll_add_fd (v4l2object->poll, &pollfd);
gst_poll_fd_ctl_read (v4l2object->poll, &pollfd, TRUE);
return TRUE;
/* ERRORS */
stat_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
no_device:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("This isn't a device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
not_open:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device '%s' for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
goto error;
}
not_capture:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a capture device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
not_output:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a output device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
error:
{
if (GST_V4L2_IS_OPEN (v4l2object)) {
/* close device */
v4l2_close (v4l2object->video_fd);
v4l2object->video_fd = -1;
}
/* empty lists */
gst_v4l2_empty_lists (v4l2object);
return FALSE;
}
}
/******************************************************
* gst_v4l2_open():
* open the video device (v4l2object->videodev)
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_open (GstV4l2Object * v4l2object)
{
struct stat st;
int libv4l2_fd;
GST_DEBUG_OBJECT (v4l2object->element, "Trying to open device %s",
v4l2object->videodev);
GST_V4L2_CHECK_NOT_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* be sure we have a device */
if (!v4l2object->videodev)
v4l2object->videodev = g_strdup ("/dev/video");
/* check if it is a device */
if (stat (v4l2object->videodev, &st) == -1)
goto stat_failed;
if (!S_ISCHR (st.st_mode))
goto no_device;
/* open the device */
v4l2object->video_fd =
open (v4l2object->videodev, O_RDWR /* | O_NONBLOCK */ );
if (!GST_V4L2_IS_OPEN (v4l2object))
goto not_open;
libv4l2_fd = v4l2_fd_open (v4l2object->video_fd,
V4L2_ENABLE_ENUM_FMT_EMULATION);
/* Note the v4l2_xxx functions are designed so that if they get passed an
unknown fd, the will behave exactly as their regular xxx counterparts, so
if v4l2_fd_open fails, we continue as normal (missing the libv4l2 custom
cam format to normal formats conversion). Chances are big we will still
fail then though, as normally v4l2_fd_open only fails if the device is not
a v4l2 device. */
if (libv4l2_fd != -1)
v4l2object->video_fd = libv4l2_fd;
/* get capabilities, error will be posted */
if (!gst_v4l2_get_capabilities (v4l2object))
goto error;
/* do we need to be a capture device? */
if (GST_IS_V4L2SRC (v4l2object->element) &&
!(v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE)))
goto not_capture;
if (GST_IS_V4L2SINK (v4l2object->element) &&
!(v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE)))
goto not_output;
if (GST_IS_V4L2_VIDEO_DEC (v4l2object->element) &&
/* Today's M2M device only expose M2M */
!((v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_M2M |
V4L2_CAP_VIDEO_M2M_MPLANE)) ||
/* But legacy driver may expose both CAPTURE and OUTPUT */
((v4l2object->vcap.capabilities &
(V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_CAPTURE_MPLANE)) &&
(v4l2object->vcap.capabilities &
(V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OUTPUT_MPLANE)))))
goto not_m2m;
gst_v4l2_adjust_buf_type (v4l2object);
/* create enumerations, posts errors. */
if (!gst_v4l2_fill_lists (v4l2object))
goto error;
GST_INFO_OBJECT (v4l2object->element,
"Opened device '%s' (%s) successfully",
v4l2object->vcap.card, v4l2object->videodev);
if (v4l2object->extra_controls)
gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls);
/* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
* causes expensive and slow USB IO, so don't probe them for interlaced
*/
if (!strcmp ((char *) v4l2object->vcap.driver, "uvcusb")) {
v4l2object->never_interlaced = TRUE;
}
return TRUE;
/* ERRORS */
stat_failed:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Cannot identify device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
no_device:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("This isn't a device '%s'."), v4l2object->videodev),
GST_ERROR_SYSTEM);
goto error;
}
not_open:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, OPEN_READ_WRITE,
(_("Could not open device '%s' for reading and writing."),
v4l2object->videodev), GST_ERROR_SYSTEM);
goto error;
}
not_capture:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a capture device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
not_output:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a output device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
not_m2m:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, NOT_FOUND,
(_("Device '%s' is not a M2M device."),
v4l2object->videodev),
("Capabilities: 0x%x", v4l2object->vcap.capabilities));
goto error;
}
error:
{
if (GST_V4L2_IS_OPEN (v4l2object)) {
/* close device */
v4l2_close (v4l2object->video_fd);
v4l2object->video_fd = -1;
}
/* empty lists */
gst_v4l2_empty_lists (v4l2object);
return FALSE;
}
}
int v4l1_open(const char *file, int oflag, ...)
{
int index, fd;
char *lfname;
struct v4l2_capability cap2;
struct v4l2_format fmt2;
struct v4l2_input input2;
struct v4l2_standard standard2;
int v4l_device = 0;
/* check if we're opening a video4linux2 device */
if (!strncmp(file, "/dev/video", 10) || !strncmp(file, "/dev/v4l/", 9)) {
/* Some apps open the device read only, but we need rw rights as the
buffers *MUST* be mapped rw */
oflag = (oflag & ~O_ACCMODE) | O_RDWR;
v4l_device = 1;
}
/* original open code */
if (oflag & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, oflag);
mode = va_arg(ap, PROMOTED_MODE_T);
fd = SYS_OPEN(file, oflag, mode);
va_end(ap);
} else {
fd = SYS_OPEN(file, oflag, 0);
}
/* end of original open code */
if (fd == -1 || !v4l_device)
return fd;
/* check that this is an v4l2 device, no need to emulate v4l1 on
a v4l1 device */
if (SYS_IOCTL(fd, VIDIOC_QUERYCAP, &cap2))
return fd;
/* If no log file was set by the app, see if one was specified through the
environment */
if (!v4l1_log_file) {
lfname = getenv("LIBV4L1_LOG_FILENAME");
if (lfname)
v4l1_log_file = fopen(lfname, "w");
}
/* redirect libv4l2 log messages to our logfile if no libv4l2 logfile is
specified */
if (!v4l2_log_file)
v4l2_log_file = v4l1_log_file;
/* Register with libv4l2, as we use that todo format conversion and read()
emulation for us */
if (v4l2_fd_open(fd, 0) == -1) {
int saved_err = errno;
SYS_CLOSE(fd);
errno = saved_err;
return -1;
}
/* Get initial width, height and pixelformat */
fmt2.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl(fd, VIDIOC_G_FMT, &fmt2)) {
int saved_err = errno;
SYS_CLOSE(fd);
errno = saved_err;
return -1;
}
/* So we have a device on which we can (and want to) emulate v4l1, register
it in our devices array */
pthread_mutex_lock(&v4l1_open_mutex);
for (index = 0; index < V4L1_MAX_DEVICES; index++)
if (devices[index].fd == -1) {
devices[index].fd = fd;
break;
}
pthread_mutex_unlock(&v4l1_open_mutex);
if (index == V4L1_MAX_DEVICES) {
V4L1_LOG_ERR("attempting to open more then %d video devices\n",
V4L1_MAX_DEVICES);
v4l2_close(fd);
errno = EBUSY;
return -1;
}
if (index >= devices_used)
devices_used = index + 1;
devices[index].flags = 0;
devices[index].open_count = 1;
devices[index].v4l1_frame_buf_map_count = 0;
devices[index].v4l1_frame_pointer = MAP_FAILED;
devices[index].width = fmt2.fmt.pix.width;
devices[index].height = fmt2.fmt.pix.height;
devices[index].v4l2_pixfmt = fmt2.fmt.pix.pixelformat;
devices[index].v4l1_pal = pixelformat_to_palette(fmt2.fmt.pix.pixelformat);
devices[index].depth = ((fmt2.fmt.pix.bytesperline << 3) +
(fmt2.fmt.pix.width - 1)) / fmt2.fmt.pix.width;
v4l1_find_min_and_max_size(index, &fmt2);
/* Check ENUM_INPUT and ENUM_STD support */
input2.index = 0;
if (v4l2_ioctl(fd, VIDIOC_ENUMINPUT, &input2) == 0)
devices[index].flags |= V4L1_SUPPORTS_ENUMINPUT;
standard2.index = 0;
if (v4l2_ioctl(fd, VIDIOC_ENUMSTD, &standard2) == 0)
devices[index].flags |= V4L1_SUPPORTS_ENUMSTD;
V4L1_LOG("open: %d\n", fd);
return fd;
}
