gboolean
gst_v4l2sink_set_output (GstV4l2Sink * v4l2sink, guint32 pixelformat,
guint32 width, guint32 height, guint fps_n, guint fps_d)
{
gint fd = v4l2sink->v4l2object->video_fd;
struct v4l2_streamparm stream;
if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G'))
return TRUE;
if (!gst_v4l2_object_set_format (v4l2sink->v4l2object, pixelformat, width,
height)) {
/* error already reported */
return FALSE;
}
/* Is there a reason we require the caller to always specify a framerate? */
GST_LOG_OBJECT (v4l2sink, "Desired framerate: %u/%u", fps_n, fps_d);
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (v4l2_ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2sink, RESOURCE, SETTINGS,
(_("Could not get parameters on device '%s'"),
v4l2sink->v4l2object->videodev), GST_ERROR_SYSTEM);
goto done;
}
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (fractions_are_equal (stream.parm.output.timeperframe.numerator,
stream.parm.output.timeperframe.denominator, fps_d, fps_n)) {
GST_LOG_OBJECT (v4l2sink, "Desired framerate already set");
v4l2sink->fps_n = fps_n;
v4l2sink->fps_d = fps_d;
goto done;
}
/* We want to change the frame rate, so check whether we can. Some cheap USB
* cameras don't have the capability */
if ((stream.parm.output.capability & V4L2_CAP_TIMEPERFRAME) == 0) {
GST_DEBUG_OBJECT (v4l2sink, "Not setting framerate (not supported)");
goto done;
}
GST_LOG_OBJECT (v4l2sink, "Setting framerate to %u/%u", fps_n, fps_d);
/* Note: V4L2 wants the frame interval, we have the frame rate */
stream.parm.output.timeperframe.numerator = fps_n;
stream.parm.output.timeperframe.denominator = fps_d;
/* some cheap USB cam's won't accept any change */
if (v4l2_ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2sink, RESOURCE, SETTINGS,
(_("Video input device did not accept new frame rate setting.")),
GST_ERROR_SYSTEM);
goto done;
}
v4l2sink->fps_n = fps_n;
v4l2sink->fps_d = fps_d;
/* if we have a framerate pre-calculate duration */
if (fps_n > 0 && fps_d > 0) {
v4l2sink->duration = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
} else {
v4l2sink->duration = GST_CLOCK_TIME_NONE;
}
GST_INFO_OBJECT (v4l2sink,
"Set framerate to %u/%u and duration to %" GST_TIME_FORMAT, fps_n, fps_d,
GST_TIME_ARGS (v4l2sink->duration));
done:
return TRUE;
}
/******************************************************
* gst_v4l2src_set_capture():
* set capture parameters
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2src_set_capture (GstV4l2Src * v4l2src, guint32 pixelformat,
guint32 width, guint32 height, guint fps_n, guint fps_d)
{
gint fd = v4l2src->v4l2object->video_fd;
struct v4l2_streamparm stream;
if (!gst_v4l2_object_set_format (v4l2src->v4l2object, pixelformat, width, height)) {
/* error already reported */
return FALSE;
}
/* Is there a reason we require the caller to always specify a framerate? */
GST_LOG_OBJECT (v4l2src, "Desired framerate: %u/%u", fps_n, fps_d);
memset (&stream, 0x00, sizeof (struct v4l2_streamparm));
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (v4l2_ioctl (fd, VIDIOC_G_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Could not get parameters on device '%s'"),
v4l2src->v4l2object->videodev), GST_ERROR_SYSTEM);
goto done;
}
/* Note: V4L2 provides the frame interval, we have the frame rate */
if (fractions_are_equal (stream.parm.capture.timeperframe.numerator,
stream.parm.capture.timeperframe.denominator, fps_d, fps_n)) {
GST_LOG_OBJECT (v4l2src, "Desired framerate already set");
v4l2src->fps_n = fps_n;
v4l2src->fps_d = fps_d;
goto done;
}
/* We want to change the frame rate, so check whether we can. Some cheap USB
* cameras don't have the capability */
if ((stream.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) == 0) {
GST_DEBUG_OBJECT (v4l2src, "Not setting framerate (not supported)");
goto done;
}
GST_LOG_OBJECT (v4l2src, "Setting framerate to %u/%u", fps_n, fps_d);
/* Note: V4L2 wants the frame interval, we have the frame rate */
stream.parm.capture.timeperframe.numerator = fps_d;
stream.parm.capture.timeperframe.denominator = fps_n;
/* some cheap USB cam's won't accept any change */
if (v4l2_ioctl (fd, VIDIOC_S_PARM, &stream) < 0) {
GST_ELEMENT_WARNING (v4l2src, RESOURCE, SETTINGS,
(_("Video input device did not accept new frame rate setting.")),
GST_ERROR_SYSTEM);
goto done;
}
v4l2src->fps_n = fps_n;
v4l2src->fps_d = fps_d;
GST_INFO_OBJECT (v4l2src, "Set framerate to %u/%u", fps_n, fps_d);
done:
return TRUE;
}
