gstreamer/subprojects/gst-plugins-bad/sys/uvcgadget/gstuvcsink.c

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/*
* SPDX-License-Identifier: LGPL-2.0-or-later
*
* Copyright (C) 2023 Pengutronix e.K. - www.pengutronix.de
*
*/
/**
* SECTION:plugin-uvcgadget
* @title: uvcgadget
*
* Since: 1.24
*/
/**
* SECTION:element-uvcsink
* @title: uvcsink
*
* uvcsink can be used to push frames to the Linux UVC Gadget
* driver.
*
* ## Example launch lines
* |[
* gst-launch videotestsrc ! uvcsink v4l2sink::device=/dev/video1
* ]|
* This pipeline streams a test pattern on UVC gadget /dev/video1.
*
* Before starting the pipeline, the linux system needs an uvc gadget
* configured on the udc (usb device controller)
*
* Either by using the legacy g_webcam gadget or by preconfiguring it
* with configfs. One way to configure is to use the example script from
* uvc-gadget:
*
* https://git.ideasonboard.org/uvc-gadget.git/blob/HEAD:/scripts/uvc-gadget.sh
*
* A modern way of configuring the gadget with an scheme file that gets
* loaded by gadget-tool (gt) using libusbgx.
*
* https://github.com/linux-usb-gadgets/libusbgx
* https://github.com/linux-usb-gadgets/gt
*
* Since: 1.24
*/
#define _GNU_SOURCE
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include "gstuvcsink.h"
GST_DEBUG_CATEGORY (uvcsink_debug);
#define GST_CAT_DEFAULT uvcsink_debug
enum
{
ARG_0,
PROP_STREAMING,
PROP_LAST
};
#define gst_uvc_sink_parent_class parent_class
G_DEFINE_TYPE (GstUvcSink, gst_uvc_sink, GST_TYPE_BIN);
GST_ELEMENT_REGISTER_DEFINE (uvcsink,
"uvcsink", GST_RANK_NONE, GST_TYPE_UVCSINK);
/* GstElement methods: */
static GstStateChangeReturn gst_uvc_sink_change_state (GstElement *
element, GstStateChange transition);
static void gst_uvc_sink_dispose (GObject * object);
static gboolean gst_uvc_sink_prepare_configfs (GstUvcSink * self);
static void
gst_uvc_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstUvcSink *self = GST_UVCSINK (object);
switch (prop_id) {
case PROP_STREAMING:
g_value_set_boolean (value, g_atomic_int_get (&self->streaming));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStructure *
gst_v4l2uvc_fourcc_to_bare_struct (guint32 fourcc)
{
GstStructure *structure = NULL;
/* Since MJPEG and YUY2 are currently the only one supported
* we limit the function to parse only these fourccs
*/
switch (fourcc) {
case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */
case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */
structure = gst_structure_new_empty ("image/jpeg");
break;
case V4L2_PIX_FMT_YUYV:{
GstVideoFormat format = GST_VIDEO_FORMAT_YUY2;
if (format != GST_VIDEO_FORMAT_UNKNOWN)
structure = gst_structure_new ("video/x-raw",
"format", G_TYPE_STRING, gst_video_format_to_string (format), NULL);
break;
}
break;
default:
GST_DEBUG ("Unsupported fourcc 0x%08x %" GST_FOURCC_FORMAT,
fourcc, GST_FOURCC_ARGS (fourcc));
break;
}
return structure;
}
/* The UVC EVENT_DATA from the host, which is committing the currently
* selected configuration (format+resolution+framerate) is only selected
* by some index values (except the framerate). We have to transform
* those values to an valid caps string that we can return on the caps
* query.
*/
static GstCaps *
gst_uvc_sink_get_configured_caps (GstUvcSink * self)
{
struct v4l2_fmtdesc format;
struct v4l2_frmsizeenum size;
struct v4l2_frmivalenum ival;
guint32 width, height;
gint device_fd;
GstStructure *s;
gint numerator, denominator;
GValue framerate = { 0, };
g_object_get (G_OBJECT (self->v4l2sink), "device-fd", &device_fd, NULL);
format.index = self->cur.bFormatIndex - 1;
format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (ioctl (device_fd, VIDIOC_ENUM_FMT, &format) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Linux kernel error"),
("VIDIOC_ENUM_FMT failed: %s (%d)", g_strerror (errno), errno));
return NULL;
}
s = gst_v4l2uvc_fourcc_to_bare_struct (format.pixelformat);
memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
size.index = self->cur.bFrameIndex - 1;
size.pixel_format = format.pixelformat;
if (ioctl (device_fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Linux kernel error"),
("VIDIOC_ENUM_FRAMESIZES failed: %s (%d)", g_strerror (errno), errno));
return NULL;
}
GST_LOG_OBJECT (self, "got discrete frame size %dx%d",
size.discrete.width, size.discrete.height);
width = MIN (size.discrete.width, G_MAXINT);
height = MIN (size.discrete.height, G_MAXINT);
if (!width || !height)
return NULL;
g_value_init (&framerate, GST_TYPE_FRACTION);
memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
ival.index = 0;
ival.pixel_format = format.pixelformat;
ival.width = width;
ival.height = height;
#define SIMPLIFY_FRACTION_N_TERMS 8
#define SIMPLIFY_FRACTION_THRESHOLD 333
numerator = self->cur.dwFrameInterval;
denominator = 10000000;
gst_util_simplify_fraction (&numerator, &denominator,
SIMPLIFY_FRACTION_N_TERMS, SIMPLIFY_FRACTION_THRESHOLD);
if (ioctl (device_fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Linux kernel error"),
("VIDIOC_ENUM_FRAMEINTERVALS failed: %s (%d)",
g_strerror (errno), errno));
return NULL;
}
do {
gint inumerator = ival.discrete.numerator;
gint idenominator = ival.discrete.denominator;
gst_util_simplify_fraction (&inumerator, &idenominator,
SIMPLIFY_FRACTION_N_TERMS, SIMPLIFY_FRACTION_THRESHOLD);
if (numerator == inumerator && denominator == idenominator)
/* swap to get the framerate */
gst_value_set_fraction (&framerate, denominator, numerator);
ival.index++;
} while (ioctl (device_fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0);
gst_structure_set (s, "width", G_TYPE_INT, (gint) width,
"height", G_TYPE_INT, (gint) height, NULL);
gst_structure_take_value (s, "framerate", &framerate);
return gst_caps_new_full (s, NULL);
}
static gboolean gst_uvc_sink_to_fakesink (GstUvcSink * self);
static gboolean gst_uvc_sink_to_v4l2sink (GstUvcSink * self);
static void
gst_uvc_sink_update_streaming (GstUvcSink * self)
{
if (self->streamon && !self->streaming)
GST_ERROR_OBJECT (self, "Unexpected STREAMON");
if (self->streamoff && self->streaming)
GST_ERROR_OBJECT (self, "Unexpected STREAMOFF");
if (self->streamon)
gst_uvc_sink_to_v4l2sink (self);
g_atomic_int_set (&self->streamon, FALSE);
g_atomic_int_set (&self->streamoff, FALSE);
}
static gboolean
gst_uvc_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstUvcSink *self = GST_UVCSINK (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
GST_DEBUG_OBJECT (self, "Handling %" GST_PTR_FORMAT, event);
/* EVENT CAPS signals that the buffers after the event will use new caps.
* If the UVC host requested a new format, we now must start the stream.
*/
if (self->caps_changed) {
if (self->streamon || self->streamoff)
g_atomic_int_set (&self->caps_changed, FALSE);
gst_uvc_sink_update_streaming (self);
}
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static gboolean
gst_uvc_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstUvcSink *self = GST_UVCSINK (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
if (gst_caps_is_empty (self->cur_caps))
return gst_pad_query_default (pad, parent, query);
GST_DEBUG_OBJECT (self, "caps %" GST_PTR_FORMAT, self->cur_caps);
gst_query_set_caps_result (query, self->cur_caps);
if (!self->caps_changed)
gst_uvc_sink_update_streaming (self);
return TRUE;
}
case GST_QUERY_ALLOCATION:
return TRUE;
default:
return gst_pad_query_default (pad, parent, query);
}
return TRUE;
}
static void
gst_uvc_sink_class_init (GstUvcSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
element_class = GST_ELEMENT_CLASS (klass);
element_class->change_state = gst_uvc_sink_change_state;
gst_element_class_set_metadata (element_class,
"UVC Sink", "Sink/Video",
"Streams Video via UVC Gadget", "Michael Grzeschik <mgr@pengutronix.de>");
GST_DEBUG_CATEGORY_INIT (uvcsink_debug, "uvcsink", 0, "uvc sink element");
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = gst_uvc_sink_dispose;
gobject_class->get_property = gst_uvc_sink_get_property;
/**
* uvcsink:streaming:
*
* The stream status of the host.
*
* Since: 1.24
*/
g_object_class_install_property (gobject_class, PROP_STREAMING,
g_param_spec_boolean ("streaming", "streaming",
"The stream status of the host", 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
static gboolean
gst_uvc_sink_to_fakesink (GstUvcSink * self)
{
if (gst_pad_is_linked (self->fakesinkpad)) {
GST_DEBUG_OBJECT (self, "v4l2sink already disabled");
return FALSE;
}
GST_DEBUG_OBJECT (self, "switching to fakesink");
gst_ghost_pad_set_target (GST_GHOST_PAD (self->sinkpad), self->fakesinkpad);
gst_element_set_state (GST_ELEMENT (self->fakesink), GST_STATE_PLAYING);
/* going to state READY makes v4l2sink lose its reference to the clock */
self->v4l2_clock = gst_element_get_clock (self->v4l2sink);
gst_pad_query (self->v4l2sinkpad, gst_query_new_drain ());
gst_element_set_state (GST_ELEMENT (self->v4l2sink), GST_STATE_READY);
return TRUE;
}
static gboolean
gst_uvc_sink_to_v4l2sink (GstUvcSink * self)
{
if (gst_pad_is_linked (self->v4l2sinkpad)) {
GST_DEBUG_OBJECT (self, "fakesink already disabled");
return FALSE;
}
if (self->v4l2_clock) {
gst_element_set_clock (self->v4l2sink, self->v4l2_clock);
gst_object_unref (self->v4l2_clock);
}
GST_DEBUG_OBJECT (self, "switching to v4l2sink");
gst_ghost_pad_set_target (GST_GHOST_PAD (self->sinkpad), self->v4l2sinkpad);
gst_element_set_state (GST_ELEMENT (self->v4l2sink), GST_STATE_PLAYING);
gst_pad_query (self->fakesinkpad, gst_query_new_drain ());
gst_element_set_state (GST_ELEMENT (self->fakesink), GST_STATE_READY);
return TRUE;
}
static GstPadProbeReturn
gst_uvc_sink_sinkpad_buffer_peer_probe (GstPad * pad,
GstPadProbeInfo * info, gpointer user_data)
{
GstUvcSink *self = user_data;
if (self->streamon || self->streamoff)
return GST_PAD_PROBE_DROP;
self->buffer_peer_probe_id = 0;
return GST_PAD_PROBE_REMOVE;
}
static GstPadProbeReturn
gst_uvc_sink_sinkpad_idle_probe (GstPad * pad,
GstPadProbeInfo * info, gpointer user_data)
{
GstUvcSink *self = user_data;
if (self->streamon || self->streamoff) {
/* Drop all incoming buffers until the streamoff or streamon is done. */
self->buffer_peer_probe_id =
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_BUFFER,
gst_uvc_sink_sinkpad_buffer_peer_probe, self, NULL);
GST_DEBUG_OBJECT (self, "Send reconfigure");
gst_pad_push_event (self->sinkpad, gst_event_new_reconfigure ());
}
if (self->streamoff)
gst_uvc_sink_to_fakesink (self);
return GST_PAD_PROBE_PASS;
}
static void
gst_uvc_sink_remove_buffer_peer_probe (GstUvcSink * self)
{
GstPad *peerpad = gst_pad_get_peer (self->sinkpad);
if (peerpad && self->buffer_peer_probe_id) {
gst_pad_remove_probe (peerpad, self->buffer_peer_probe_id);
gst_object_unref (peerpad);
self->buffer_peer_probe_id = 0;
}
}
static void
gst_uvc_sink_create_idle_probe (GstUvcSink * self)
{
GstPad *peerpad = gst_pad_get_peer (self->sinkpad);
if (peerpad) {
self->idle_probe_id =
gst_pad_add_probe (peerpad, GST_PAD_PROBE_TYPE_IDLE,
gst_uvc_sink_sinkpad_idle_probe, self, NULL);
gst_object_unref (peerpad);
}
}
static void
gst_uvc_sink_remove_idle_probe (GstUvcSink * self)
{
GstPad *peerpad = gst_pad_get_peer (self->sinkpad);
if (peerpad && self->idle_probe_id) {
gst_pad_remove_probe (peerpad, self->idle_probe_id);
gst_object_unref (peerpad);
self->idle_probe_id = 0;
}
}
static gboolean
gst_uvc_sink_open (GstUvcSink * self)
{
if (!self->v4l2sink) {
gst_element_post_message (GST_ELEMENT_CAST (self),
gst_missing_element_message_new (GST_ELEMENT_CAST (self), "v4l2sink"));
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("No v4l2sink element found"), ("Check your plugin installation"));
return FALSE;
}
if (!self->fakesink) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("No fakesink element found"), ("Check your plugin installation"));
return FALSE;
}
return TRUE;
}
static void
gst_uvc_sink_init (GstUvcSink * self)
{
/* add the v4l2sink element */
self->v4l2sink = gst_element_factory_make ("v4l2sink", "v4l2sink");
if (!self->v4l2sink)
return;
g_object_set (G_OBJECT (self->v4l2sink), "async", FALSE, NULL);
gst_bin_add (GST_BIN (self), self->v4l2sink);
/* add the fakesink element */
self->fakesink = gst_element_factory_make ("fakesink", "fakesink");
if (!self->fakesink)
return;
g_object_set (G_OBJECT (self->fakesink), "sync", TRUE, NULL);
gst_bin_add (GST_BIN (self), self->fakesink);
self->v4l2sinkpad = gst_element_get_static_pad (self->v4l2sink, "sink");
g_return_if_fail (self->v4l2sinkpad != NULL);
self->fakesinkpad = gst_element_get_static_pad (self->fakesink, "sink");
g_return_if_fail (self->fakesinkpad != NULL);
/* create ghost pad sink */
self->sinkpad = gst_ghost_pad_new ("sink", self->fakesinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
g_atomic_int_set (&self->streaming, FALSE);
g_atomic_int_set (&self->streamon, FALSE);
g_atomic_int_set (&self->streamoff, FALSE);
gst_pad_set_query_function (self->sinkpad, gst_uvc_sink_query);
gst_pad_set_event_function (self->sinkpad, gst_uvc_sink_event);
self->cur_caps = gst_caps_new_empty ();
}
static void
gst_uvc_sink_dispose (GObject * object)
{
GstUvcSink *self = GST_UVCSINK (object);
if (self->sinkpad) {
gst_uvc_sink_remove_buffer_peer_probe (self);
gst_pad_set_active (self->sinkpad, FALSE);
gst_element_remove_pad (GST_ELEMENT (self), self->sinkpad);
self->sinkpad = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean gst_uvc_sink_unwatch (GstUvcSink * self);
/* the thread where everything happens */
static void
gst_uvc_sink_task (gpointer data)
{
GstUvcSink *self = GST_UVCSINK (data);
GstClockTime timeout = GST_CLOCK_TIME_NONE;
struct uvc_request_data resp;
gboolean ret = TRUE;
/* Since the plugin needs to be able to start immidiatly in PLAYING
state we ensure the pipeline is not blocked while we poll for
events.
*/
GST_PAD_STREAM_UNLOCK (self->sinkpad);
ret = gst_poll_wait (self->poll, timeout);
if (G_UNLIKELY (ret < 0))
return;
timeout = GST_CLOCK_TIME_NONE;
if (gst_poll_fd_has_closed (self->poll, &self->pollfd)) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("videofd was closed"), NULL);
gst_uvc_sink_unwatch (self);
gst_element_set_state (GST_ELEMENT (self), GST_STATE_NULL);
return;
}
if (gst_poll_fd_has_error (self->poll, &self->pollfd)) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("videofd has error"), NULL);
gst_uvc_sink_unwatch (self);
gst_element_set_state (GST_ELEMENT (self), GST_STATE_NULL);
return;
}
/* PRI is used to signal that events are available */
if (gst_poll_fd_has_pri (self->poll, &self->pollfd)) {
struct v4l2_event event = { 0, };
struct uvc_event *uvc_event = (void *) &event.u.data;
if (ioctl (self->pollfd.fd, VIDIOC_DQEVENT, &event) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("could not dequeue event"), NULL);
gst_uvc_sink_unwatch (self);
gst_element_set_state (GST_ELEMENT (self), GST_STATE_NULL);
return;
}
switch (event.type) {
case UVC_EVENT_STREAMON:
GST_DEBUG_OBJECT (self, "UVC_EVENT_STREAMON");
GST_STATE_LOCK (GST_ELEMENT (self));
g_atomic_int_set (&self->streaming, TRUE);
g_atomic_int_set (&self->streamon, TRUE);
GST_STATE_UNLOCK (GST_ELEMENT (self));
g_object_notify (G_OBJECT (self), "streaming");
break;
case UVC_EVENT_STREAMOFF:
case UVC_EVENT_DISCONNECT:
GST_DEBUG_OBJECT (self, "UVC_EVENT_STREAMOFF");
GST_STATE_LOCK (GST_ELEMENT (self));
g_atomic_int_set (&self->streaming, FALSE);
g_atomic_int_set (&self->streamoff, TRUE);
GST_STATE_UNLOCK (GST_ELEMENT (self));
g_object_notify (G_OBJECT (self), "streaming");
break;
case UVC_EVENT_SETUP:
GST_DEBUG_OBJECT (self, "UVC_EVENT_SETUP");
memset (&resp, 0, sizeof (resp));
resp.length = -EL2HLT;
uvc_events_process_setup (self, &uvc_event->req, &resp);
if (ioctl (self->pollfd.fd, UVCIOC_SEND_RESPONSE, &resp) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("UVCIOC_SEND_RESPONSE failed"),
("UVCIOC_SEND_RESPONSE on UVC_EVENT_SETUP failed"));
gst_uvc_sink_unwatch (self);
gst_element_set_state (GST_ELEMENT (self), GST_STATE_NULL);
return;
}
break;
case UVC_EVENT_DATA:
GST_DEBUG_OBJECT (self, "UVC_EVENT_DATA");
uvc_events_process_data (self, &uvc_event->data);
if (self->control == UVC_VS_COMMIT_CONTROL) {
GstCaps *configured_caps;
GstCaps *prev_caps;
/* The configured caps are not sufficient for negotiation. Select caps
* from the probed caps that match the configured caps.
*/
configured_caps = gst_uvc_sink_get_configured_caps (self);
gst_clear_caps (&self->cur_caps);
self->cur_caps =
gst_caps_intersect_full (self->probed_caps, configured_caps,
GST_CAPS_INTERSECT_FIRST);
GST_INFO_OBJECT (self, "UVC host selected %" GST_PTR_FORMAT,
self->cur_caps);
gst_caps_unref (configured_caps);
prev_caps = gst_pad_get_current_caps (self->sinkpad);
if (!gst_caps_is_subset (prev_caps, self->cur_caps)) {
self->caps_changed = TRUE;
GST_DEBUG_OBJECT (self,
"caps changed from %" GST_PTR_FORMAT, prev_caps);
}
gst_caps_unref (prev_caps);
}
break;
default:
break;
}
}
}
static gboolean
gst_uvc_sink_watch (GstUvcSink * self)
{
struct v4l2_event_subscription sub = {.type = UVC_EVENT_STREAMON };
gboolean ret = TRUE;
gint device_fd;
gint fd;
ret = gst_uvc_sink_prepare_configfs (self);
if (!ret) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("could not parse configfs"), ("Check your configfs setup"));
return FALSE;
}
g_object_get (G_OBJECT (self->v4l2sink), "device-fd", &device_fd, NULL);
fd = dup3 (device_fd, device_fd + 1, O_CLOEXEC);
if (fd < 0)
return FALSE;
self->poll = gst_poll_new (TRUE);
gst_poll_fd_init (&self->pollfd);
self->pollfd.fd = fd;
gst_poll_add_fd (self->poll, &self->pollfd);
gst_poll_fd_ctl_pri (self->poll, &self->pollfd, TRUE);
if (ioctl (device_fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to subscribe event"),
("UVC_EVENT_STREAMON could not be subscribed"));
return FALSE;
}
sub.type = UVC_EVENT_STREAMOFF;
if (ioctl (device_fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to subscribe event"),
("UVC_EVENT_STREAMOFF could not be subscribed"));
return FALSE;
}
sub.type = UVC_EVENT_DISCONNECT;
if (ioctl (device_fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to subscribe event"),
("UVC_EVENT_DISCONNECT could not be subscribed"));
return FALSE;
}
sub.type = UVC_EVENT_SETUP;
if (ioctl (device_fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to subscribe event"),
("UVC_EVENT_SETUP could not be subscribed"));
return FALSE;
}
sub.type = UVC_EVENT_DATA;
if (ioctl (device_fd, VIDIOC_SUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to subscribe event"),
("UVC_EVENT_DATA could not be subscribed"));
return FALSE;
}
if (!gst_pad_start_task (GST_PAD (self->sinkpad),
(GstTaskFunction) gst_uvc_sink_task, self, NULL)) {
GST_ELEMENT_ERROR (self, CORE, THREAD, ("Could not start pad task"),
("Could not start pad task"));
return FALSE;
}
return TRUE;
}
static gboolean
gst_uvc_sink_unwatch (GstUvcSink * self)
{
struct v4l2_event_subscription sub = {.type = UVC_EVENT_DATA };
gint device_fd;
gst_poll_set_flushing (self->poll, TRUE);
gst_pad_stop_task (GST_PAD (self->sinkpad));
g_object_get (G_OBJECT (self->v4l2sink), "device-fd", &device_fd, NULL);
if (ioctl (device_fd, VIDIOC_UNSUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to unsubscribe event"),
("UVC_EVENT_DATA could not be unsubscribed"));
return FALSE;
}
sub.type = UVC_EVENT_SETUP;
if (ioctl (device_fd, VIDIOC_UNSUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to unsubscribe event"),
("UVC_EVENT_SETUP could not be unsubscribed"));
return FALSE;
}
sub.type = UVC_EVENT_STREAMON;
if (ioctl (device_fd, VIDIOC_UNSUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to unsubscribe event"),
("UVC_EVENT_STREAMON could not be unsubscribed"));
return FALSE;
}
sub.type = UVC_EVENT_STREAMOFF;
if (ioctl (device_fd, VIDIOC_UNSUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to unsubscribe event"),
("UVC_EVENT_STREAMOFF could not be unsubscribed"));
return FALSE;
}
sub.type = UVC_EVENT_DISCONNECT;
if (ioctl (device_fd, VIDIOC_UNSUBSCRIBE_EVENT, &sub) < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to unsubscribe event"),
("UVC_EVENT_DISCONNECT could not be unsubscribed"));
return FALSE;
}
return TRUE;
}
static gboolean
gst_uvc_sink_prepare_configfs (GstUvcSink * self)
{
gint device_fd;
GValue device = G_VALUE_INIT;
g_object_get (G_OBJECT (self->v4l2sink), "device-fd", &device_fd, NULL);
g_object_get_property (G_OBJECT (self->v4l2sink), "device", &device);
self->fc = configfs_parse_uvc_videodev (device_fd,
g_value_get_string (&device));
if (!self->fc) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Failed to identify function configuration"),
("Check your configfs setup"));
return FALSE;
}
uvc_fill_streaming_control (self, &self->probe, self->cur.bFrameIndex,
self->cur.bFormatIndex, self->cur.dwFrameInterval);
uvc_fill_streaming_control (self, &self->commit, self->cur.bFrameIndex,
self->cur.bFormatIndex, self->cur.dwFrameInterval);
return TRUE;
}
static gboolean
gst_uvc_sink_query_probed_caps (GstUvcSink * self)
{
GstQuery *caps_query = gst_query_new_caps (NULL);
GstCaps *query_caps;
gst_clear_caps (&self->probed_caps);
if (!gst_pad_query (self->v4l2sinkpad, caps_query))
return FALSE;
gst_query_parse_caps_result (caps_query, &query_caps);
gst_query_unref (caps_query);
self->probed_caps = gst_caps_copy (query_caps);
gst_caps_replace (&self->cur_caps, self->probed_caps);
return TRUE;
}
static GstStateChangeReturn
gst_uvc_sink_change_state (GstElement * element, GstStateChange transition)
{
GstUvcSink *self = GST_UVCSINK (element);
int bret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG_OBJECT (self, "%s -> %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_uvc_sink_open (self))
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_uvc_sink_create_idle_probe (self);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_element_sync_state_with_parent (GST_ELEMENT (self->fakesink));
gst_uvc_sink_remove_idle_probe (self);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (!gst_uvc_sink_unwatch (self))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_uvc_sink_watch (self))
return GST_STATE_CHANGE_FAILURE;
if (!gst_uvc_sink_query_probed_caps (self))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
return bret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (uvcsink, plugin);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
uvcgadget,
"gstuvcgadget plugin",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)