3 * Copyright (C) 2009 Texas Instruments, Inc - http://www.ti.com/
5 * Description: V4L2 sink element
6 * Created on: Jul 2, 2009
7 * Author: Rob Clark <rob@ti.com>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 * SECTION:element-v4l2sink
28 * v4l2sink can be used to display video to v4l2 devices (screen overlays
29 * provided by the graphics hardware, tv-out, etc)
32 * <title>Example launch lines</title>
34 * gst-launch videotestsrc ! v4l2sink device=/dev/video1
35 * ]| This pipeline displays a test pattern on /dev/video1
37 * gst-launch -v videotestsrc ! navigationtest ! v4l2sink
38 * ]| A pipeline to test navigation events.
39 * While moving the mouse pointer over the test signal you will see a black box
40 * following the mouse pointer. If you press the mouse button somewhere on the
41 * video and release it somewhere else a green box will appear where you pressed
42 * the button and a red one where you released it. (The navigationtest element
43 * is part of gst-plugins-good.) You can observe here that even if the images
44 * are scaled through hardware the pointer coordinates are converted back to the
45 * original video frame geometry so that the box can be drawn to the correct
46 * position. This also handles borders correctly, limiting coordinates to the
57 #include "gstv4l2colorbalance.h"
58 #include "gstv4l2tuner.h"
60 #include "gstv4l2xoverlay.h"
62 #include "gstv4l2vidorient.h"
64 #include "gstv4l2sink.h"
65 #include "gst/gst-i18n-plugin.h"
69 GST_DEBUG_CATEGORY (v4l2sink_debug);
70 #define GST_CAT_DEFAULT v4l2sink_debug
72 #define PROP_DEF_QUEUE_SIZE 12
73 #define PROP_DEF_MIN_QUEUED_BUFS 1
74 #define DEFAULT_PROP_DEVICE "/dev/video1"
79 V4L2_STD_OBJECT_PROPS,
93 GST_IMPLEMENT_V4L2_PROBE_METHODS (GstV4l2SinkClass, gst_v4l2sink);
94 GST_IMPLEMENT_V4L2_COLOR_BALANCE_METHODS (GstV4l2Sink, gst_v4l2sink);
95 GST_IMPLEMENT_V4L2_TUNER_METHODS (GstV4l2Sink, gst_v4l2sink);
97 GST_IMPLEMENT_V4L2_XOVERLAY_METHODS (GstV4l2Sink, gst_v4l2sink);
99 GST_IMPLEMENT_V4L2_VIDORIENT_METHODS (GstV4l2Sink, gst_v4l2sink);
102 static void gst_v4l2sink_navigation_send_event (GstNavigation * navigation,
103 GstStructure * structure);
105 gst_v4l2sink_navigation_init (GstNavigationInterface * iface)
107 iface->send_event = gst_v4l2sink_navigation_send_event;
111 #define gst_v4l2sink_parent_class parent_class
112 G_DEFINE_TYPE_WITH_CODE (GstV4l2Sink, gst_v4l2sink, GST_TYPE_VIDEO_SINK,
113 G_IMPLEMENT_INTERFACE (GST_TYPE_TUNER, gst_v4l2sink_tuner_interface_init);
115 G_IMPLEMENT_INTERFACE (GST_TYPE_X_OVERLAY,
116 gst_v4l2sink_xoverlay_interface_init);
117 G_IMPLEMENT_INTERFACE (GST_TYPE_NAVIGATION, gst_v4l2sink_navigation_init);
119 G_IMPLEMENT_INTERFACE (GST_TYPE_COLOR_BALANCE,
120 gst_v4l2sink_color_balance_interface_init);
121 G_IMPLEMENT_INTERFACE (GST_TYPE_VIDEO_ORIENTATION,
122 gst_v4l2sink_video_orientation_interface_init);
123 G_IMPLEMENT_INTERFACE (GST_TYPE_PROPERTY_PROBE,
124 gst_v4l2sink_property_probe_interface_init));
127 static void gst_v4l2sink_dispose (GObject * object);
128 static void gst_v4l2sink_finalize (GstV4l2Sink * v4l2sink);
130 /* GObject methods: */
131 static void gst_v4l2sink_set_property (GObject * object, guint prop_id,
132 const GValue * value, GParamSpec * pspec);
133 static void gst_v4l2sink_get_property (GObject * object, guint prop_id,
134 GValue * value, GParamSpec * pspec);
137 /* GstElement methods: */
138 static GstStateChangeReturn gst_v4l2sink_change_state (GstElement * element,
139 GstStateChange transition);
141 /* GstBaseSink methods: */
142 static GstCaps *gst_v4l2sink_get_caps (GstBaseSink * bsink, GstCaps * filter);
143 static gboolean gst_v4l2sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
145 static GstFlowReturn gst_v4l2sink_buffer_alloc (GstBaseSink * bsink,
146 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
148 static GstFlowReturn gst_v4l2sink_show_frame (GstBaseSink * bsink,
152 gst_v4l2sink_class_init (GstV4l2SinkClass * klass)
154 GObjectClass *gobject_class;
155 GstElementClass *element_class;
156 GstBaseSinkClass *basesink_class;
158 gobject_class = G_OBJECT_CLASS (klass);
159 element_class = GST_ELEMENT_CLASS (klass);
160 basesink_class = GST_BASE_SINK_CLASS (klass);
162 gobject_class->dispose = gst_v4l2sink_dispose;
163 gobject_class->finalize = (GObjectFinalizeFunc) gst_v4l2sink_finalize;
164 gobject_class->set_property = gst_v4l2sink_set_property;
165 gobject_class->get_property = gst_v4l2sink_get_property;
167 element_class->change_state = gst_v4l2sink_change_state;
169 gst_v4l2_object_install_properties_helper (gobject_class,
170 DEFAULT_PROP_DEVICE);
171 g_object_class_install_property (gobject_class, PROP_QUEUE_SIZE,
172 g_param_spec_uint ("queue-size", "Queue size",
173 "Number of buffers to be enqueud in the driver in streaming mode",
174 GST_V4L2_MIN_BUFFERS, GST_V4L2_MAX_BUFFERS, PROP_DEF_QUEUE_SIZE,
175 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
176 g_object_class_install_property (gobject_class, PROP_MIN_QUEUED_BUFS,
177 g_param_spec_uint ("min-queued-bufs", "Minimum queued bufs",
178 "Minimum number of queued bufs; v4l2sink won't dqbuf if the driver "
179 "doesn't have more than this number (which normally you shouldn't change)",
180 0, GST_V4L2_MAX_BUFFERS, PROP_DEF_MIN_QUEUED_BUFS,
181 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
182 g_object_class_install_property (gobject_class, PROP_OVERLAY_TOP,
183 g_param_spec_int ("overlay-top", "Overlay top",
184 "The topmost (y) coordinate of the video overlay; top left corner of screen is 0,0",
185 G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
186 g_object_class_install_property (gobject_class, PROP_OVERLAY_LEFT,
187 g_param_spec_int ("overlay-left", "Overlay left",
188 "The leftmost (x) coordinate of the video overlay; top left corner of screen is 0,0",
189 G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
190 g_object_class_install_property (gobject_class, PROP_OVERLAY_WIDTH,
191 g_param_spec_uint ("overlay-width", "Overlay width",
192 "The width of the video overlay; default is equal to negotiated image width",
193 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
194 g_object_class_install_property (gobject_class, PROP_OVERLAY_HEIGHT,
195 g_param_spec_uint ("overlay-height", "Overlay height",
196 "The height of the video overlay; default is equal to negotiated image height",
197 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
199 g_object_class_install_property (gobject_class, PROP_CROP_TOP,
200 g_param_spec_int ("crop-top", "Crop top",
201 "The topmost (y) coordinate of the video crop; top left corner of image is 0,0",
202 0x80000000, 0x7fffffff, 0, G_PARAM_READWRITE));
203 g_object_class_install_property (gobject_class, PROP_CROP_LEFT,
204 g_param_spec_int ("crop-left", "Crop left",
205 "The leftmost (x) coordinate of the video crop; top left corner of image is 0,0",
206 0x80000000, 0x7fffffff, 0, G_PARAM_READWRITE));
207 g_object_class_install_property (gobject_class, PROP_CROP_WIDTH,
208 g_param_spec_uint ("crop-width", "Crop width",
209 "The width of the video crop; default is equal to negotiated image width",
210 0, 0xffffffff, 0, G_PARAM_READWRITE));
211 g_object_class_install_property (gobject_class, PROP_CROP_HEIGHT,
212 g_param_spec_uint ("crop-height", "Crop height",
213 "The height of the video crop; default is equal to negotiated image height",
214 0, 0xffffffff, 0, G_PARAM_READWRITE));
216 gst_element_class_set_details_simple (element_class,
217 "Video (video4linux2) Sink", "Sink/Video",
218 "Displays frames on a video4linux2 device", "Rob Clark <rob@ti.com>,");
220 gst_element_class_add_pad_template (element_class,
221 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
222 gst_v4l2_object_get_all_caps ()));
224 basesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_v4l2sink_get_caps);
225 basesink_class->set_caps = GST_DEBUG_FUNCPTR (gst_v4l2sink_set_caps);
226 basesink_class->render = GST_DEBUG_FUNCPTR (gst_v4l2sink_show_frame);
228 klass->v4l2_class_devices = NULL;
230 GST_DEBUG_CATEGORY_INIT (v4l2sink_debug, "v4l2sink", 0, "V4L2 sink element");
235 gst_v4l2sink_init (GstV4l2Sink * v4l2sink)
237 v4l2sink->v4l2object = gst_v4l2_object_new (GST_ELEMENT (v4l2sink),
238 V4L2_BUF_TYPE_VIDEO_OUTPUT, DEFAULT_PROP_DEVICE,
239 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
241 /* same default value for video output device as is used for
242 * v4l2src/capture is no good.. so lets set a saner default
243 * (which can be overridden by the one creating the v4l2sink
244 * after the constructor returns)
246 g_object_set (v4l2sink, "device", "/dev/video1", NULL);
248 /* number of buffers requested */
249 v4l2sink->num_buffers = PROP_DEF_QUEUE_SIZE;
250 v4l2sink->min_queued_bufs = PROP_DEF_MIN_QUEUED_BUFS;
252 v4l2sink->probed_caps = NULL;
253 v4l2sink->current_caps = NULL;
255 v4l2sink->overlay_fields_set = 0;
256 v4l2sink->crop_fields_set = 0;
262 gst_v4l2sink_dispose (GObject * object)
264 GstV4l2Sink *v4l2sink = GST_V4L2SINK (object);
266 if (v4l2sink->probed_caps) {
267 gst_caps_unref (v4l2sink->probed_caps);
270 if (v4l2sink->current_caps) {
271 gst_caps_unref (v4l2sink->current_caps);
274 G_OBJECT_CLASS (parent_class)->dispose (object);
279 gst_v4l2sink_finalize (GstV4l2Sink * v4l2sink)
281 gst_v4l2_object_destroy (v4l2sink->v4l2object);
283 G_OBJECT_CLASS (parent_class)->finalize ((GObject *) (v4l2sink));
293 STATE_PENDING_STREAMON,
298 * flags to indicate which overlay/crop properties the user has set (and
299 * therefore which ones should override the defaults from the driver)
304 RECT_LEFT_SET = 0x02,
305 RECT_WIDTH_SET = 0x04,
306 RECT_HEIGHT_SET = 0x08
310 gst_v4l2sink_sync_overlay_fields (GstV4l2Sink * v4l2sink)
312 if (!v4l2sink->overlay_fields_set)
315 if (GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
317 gint fd = v4l2sink->v4l2object->video_fd;
318 struct v4l2_format format;
320 memset (&format, 0x00, sizeof (struct v4l2_format));
321 format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
323 if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0) {
324 GST_WARNING_OBJECT (v4l2sink, "VIDIOC_G_FMT failed");
328 GST_DEBUG_OBJECT (v4l2sink,
329 "setting overlay: overlay_fields_set=0x%02x, top=%d, left=%d, width=%d, height=%d",
330 v4l2sink->overlay_fields_set,
331 v4l2sink->overlay.top, v4l2sink->overlay.left,
332 v4l2sink->overlay.width, v4l2sink->overlay.height);
334 if (v4l2sink->overlay_fields_set & RECT_TOP_SET)
335 format.fmt.win.w.top = v4l2sink->overlay.top;
336 if (v4l2sink->overlay_fields_set & RECT_LEFT_SET)
337 format.fmt.win.w.left = v4l2sink->overlay.left;
338 if (v4l2sink->overlay_fields_set & RECT_WIDTH_SET)
339 format.fmt.win.w.width = v4l2sink->overlay.width;
340 if (v4l2sink->overlay_fields_set & RECT_HEIGHT_SET)
341 format.fmt.win.w.height = v4l2sink->overlay.height;
343 if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
344 GST_WARNING_OBJECT (v4l2sink, "VIDIOC_S_FMT failed");
348 v4l2sink->overlay_fields_set = 0;
349 v4l2sink->overlay = format.fmt.win.w;
354 gst_v4l2sink_sync_crop_fields (GstV4l2Sink * v4l2sink)
356 if (!v4l2sink->crop_fields_set)
359 if (GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
361 gint fd = v4l2sink->v4l2object->video_fd;
362 struct v4l2_crop crop;
364 memset (&crop, 0x00, sizeof (struct v4l2_crop));
365 crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
367 if (v4l2_ioctl (fd, VIDIOC_G_CROP, &crop) < 0) {
368 GST_WARNING_OBJECT (v4l2sink, "VIDIOC_G_CROP failed");
372 GST_DEBUG_OBJECT (v4l2sink,
373 "setting crop: crop_fields_set=0x%02x, top=%d, left=%d, width=%d, height=%d",
374 v4l2sink->crop_fields_set,
375 v4l2sink->crop.top, v4l2sink->crop.left,
376 v4l2sink->crop.width, v4l2sink->crop.height);
378 if (v4l2sink->crop_fields_set & RECT_TOP_SET)
379 crop.c.top = v4l2sink->crop.top;
380 if (v4l2sink->crop_fields_set & RECT_LEFT_SET)
381 crop.c.left = v4l2sink->crop.left;
382 if (v4l2sink->crop_fields_set & RECT_WIDTH_SET)
383 crop.c.width = v4l2sink->crop.width;
384 if (v4l2sink->crop_fields_set & RECT_HEIGHT_SET)
385 crop.c.height = v4l2sink->crop.height;
387 if (v4l2_ioctl (fd, VIDIOC_S_CROP, &crop) < 0) {
388 GST_WARNING_OBJECT (v4l2sink, "VIDIOC_S_CROP failed");
392 v4l2sink->crop_fields_set = 0;
393 v4l2sink->crop = crop.c;
399 gst_v4l2sink_set_property (GObject * object,
400 guint prop_id, const GValue * value, GParamSpec * pspec)
402 GstV4l2Sink *v4l2sink = GST_V4L2SINK (object);
404 if (!gst_v4l2_object_set_property_helper (v4l2sink->v4l2object,
405 prop_id, value, pspec)) {
407 case PROP_QUEUE_SIZE:
408 v4l2sink->num_buffers = g_value_get_uint (value);
410 case PROP_MIN_QUEUED_BUFS:
411 v4l2sink->min_queued_bufs = g_value_get_uint (value);
413 case PROP_OVERLAY_TOP:
414 v4l2sink->overlay.top = g_value_get_int (value);
415 v4l2sink->overlay_fields_set |= RECT_TOP_SET;
416 gst_v4l2sink_sync_overlay_fields (v4l2sink);
418 case PROP_OVERLAY_LEFT:
419 v4l2sink->overlay.left = g_value_get_int (value);
420 v4l2sink->overlay_fields_set |= RECT_LEFT_SET;
421 gst_v4l2sink_sync_overlay_fields (v4l2sink);
423 case PROP_OVERLAY_WIDTH:
424 v4l2sink->overlay.width = g_value_get_uint (value);
425 v4l2sink->overlay_fields_set |= RECT_WIDTH_SET;
426 gst_v4l2sink_sync_overlay_fields (v4l2sink);
428 case PROP_OVERLAY_HEIGHT:
429 v4l2sink->overlay.height = g_value_get_uint (value);
430 v4l2sink->overlay_fields_set |= RECT_HEIGHT_SET;
431 gst_v4l2sink_sync_overlay_fields (v4l2sink);
434 v4l2sink->crop.top = g_value_get_int (value);
435 v4l2sink->crop_fields_set |= RECT_TOP_SET;
436 gst_v4l2sink_sync_crop_fields (v4l2sink);
439 v4l2sink->crop.left = g_value_get_int (value);
440 v4l2sink->crop_fields_set |= RECT_LEFT_SET;
441 gst_v4l2sink_sync_crop_fields (v4l2sink);
443 case PROP_CROP_WIDTH:
444 v4l2sink->crop.width = g_value_get_uint (value);
445 v4l2sink->crop_fields_set |= RECT_WIDTH_SET;
446 gst_v4l2sink_sync_crop_fields (v4l2sink);
448 case PROP_CROP_HEIGHT:
449 v4l2sink->crop.height = g_value_get_uint (value);
450 v4l2sink->crop_fields_set |= RECT_HEIGHT_SET;
451 gst_v4l2sink_sync_crop_fields (v4l2sink);
454 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
462 gst_v4l2sink_get_property (GObject * object,
463 guint prop_id, GValue * value, GParamSpec * pspec)
465 GstV4l2Sink *v4l2sink = GST_V4L2SINK (object);
467 if (!gst_v4l2_object_get_property_helper (v4l2sink->v4l2object,
468 prop_id, value, pspec)) {
470 case PROP_QUEUE_SIZE:
471 g_value_set_uint (value, v4l2sink->num_buffers);
473 case PROP_MIN_QUEUED_BUFS:
474 g_value_set_uint (value, v4l2sink->min_queued_bufs);
476 case PROP_OVERLAY_TOP:
477 g_value_set_int (value, v4l2sink->overlay.top);
479 case PROP_OVERLAY_LEFT:
480 g_value_set_int (value, v4l2sink->overlay.left);
482 case PROP_OVERLAY_WIDTH:
483 g_value_set_uint (value, v4l2sink->overlay.width);
485 case PROP_OVERLAY_HEIGHT:
486 g_value_set_uint (value, v4l2sink->overlay.height);
489 g_value_set_int (value, v4l2sink->crop.top);
492 g_value_set_int (value, v4l2sink->crop.left);
494 case PROP_CROP_WIDTH:
495 g_value_set_uint (value, v4l2sink->crop.width);
497 case PROP_CROP_HEIGHT:
498 g_value_set_uint (value, v4l2sink->crop.height);
501 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
507 static GstStateChangeReturn
508 gst_v4l2sink_change_state (GstElement * element, GstStateChange transition)
510 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
511 GstV4l2Sink *v4l2sink = GST_V4L2SINK (element);
513 GST_DEBUG_OBJECT (v4l2sink, "%d -> %d",
514 GST_STATE_TRANSITION_CURRENT (transition),
515 GST_STATE_TRANSITION_NEXT (transition));
517 switch (transition) {
518 case GST_STATE_CHANGE_NULL_TO_READY:
519 /* open the device */
520 if (!gst_v4l2_object_start (v4l2sink->v4l2object))
521 return GST_STATE_CHANGE_FAILURE;
527 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
529 switch (transition) {
530 case GST_STATE_CHANGE_PAUSED_TO_READY:
531 if (v4l2sink->state == STATE_STREAMING) {
532 if (!gst_v4l2_object_stop_streaming (v4l2sink->v4l2object)) {
533 return GST_STATE_CHANGE_FAILURE;
535 v4l2sink->state = STATE_PENDING_STREAMON;
538 case GST_STATE_CHANGE_READY_TO_NULL:
539 if (NULL != v4l2sink->pool)
540 gst_v4l2_buffer_pool_destroy (v4l2sink->pool);
541 v4l2sink->pool = NULL;
542 /* close the device */
543 if (!gst_v4l2_object_stop (v4l2sink->v4l2object))
544 return GST_STATE_CHANGE_FAILURE;
545 v4l2sink->state = STATE_OFF;
556 gst_v4l2sink_get_caps (GstBaseSink * bsink, GstCaps * filter)
558 GstV4l2Sink *v4l2sink = GST_V4L2SINK (bsink);
563 if (!GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
565 GST_DEBUG_OBJECT (v4l2sink, "device is not open");
567 gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_SINK_PAD
571 if (v4l2sink->probed_caps == NULL) {
572 formats = gst_v4l2_object_get_format_list (v4l2sink->v4l2object);
574 ret = gst_caps_new_empty ();
576 for (walk = formats; walk; walk = walk->next) {
577 struct v4l2_fmtdesc *format;
579 GstStructure *template;
581 format = (struct v4l2_fmtdesc *) walk->data;
583 template = gst_v4l2_object_v4l2fourcc_to_structure (format->pixelformat);
589 gst_v4l2_object_probe_caps_for_format (v4l2sink->v4l2object,
590 format->pixelformat, template);
592 gst_caps_append (ret, tmp);
594 gst_structure_free (template);
596 GST_DEBUG_OBJECT (v4l2sink, "unknown format %u", format->pixelformat);
599 v4l2sink->probed_caps = ret;
604 gst_caps_intersect_full (filter, v4l2sink->probed_caps,
605 GST_CAPS_INTERSECT_FIRST);
607 ret = gst_caps_ref (v4l2sink->probed_caps);
610 GST_INFO_OBJECT (v4l2sink, "probed caps: %p", ret);
611 LOG_CAPS (v4l2sink, ret);
617 gst_v4l2sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
619 GstV4l2Sink *v4l2sink = GST_V4L2SINK (bsink);
620 GstV4l2BufferPool *newpool;
622 LOG_CAPS (v4l2sink, caps);
624 if (!GST_V4L2_IS_OPEN (v4l2sink->v4l2object)) {
625 GST_DEBUG_OBJECT (v4l2sink, "device is not open");
629 if (v4l2sink->current_caps) {
630 GST_DEBUG_OBJECT (v4l2sink, "already have caps set.. are they equal?");
631 LOG_CAPS (v4l2sink, v4l2sink->current_caps);
632 if (gst_caps_is_equal (v4l2sink->current_caps, caps)) {
633 GST_DEBUG_OBJECT (v4l2sink, "yes they are!");
636 GST_DEBUG_OBJECT (v4l2sink, "no they aren't!");
639 if (v4l2sink->pool) {
640 /* we have a pool already, stop and destroy the old pool */
641 if (v4l2sink->state == STATE_STREAMING) {
642 if (!gst_v4l2_object_stop_streaming (v4l2sink->v4l2object))
645 v4l2sink->state = STATE_PENDING_STREAMON;
647 gst_v4l2_buffer_pool_destroy (v4l2sink->pool);
648 v4l2sink->pool = NULL;
651 if (!gst_v4l2_object_set_format (v4l2sink->v4l2object, caps))
654 if (!(v4l2sink->v4l2object->vcap.capabilities & V4L2_CAP_STREAMING))
657 newpool = gst_v4l2_buffer_pool_new (v4l2sink->v4l2object,
658 v4l2sink->num_buffers, FALSE);
662 v4l2sink->pool = newpool;
664 gst_v4l2sink_sync_overlay_fields (v4l2sink);
665 gst_v4l2sink_sync_crop_fields (v4l2sink);
668 gst_v4l2_xoverlay_prepare_xwindow_id (v4l2sink->v4l2object, TRUE);
671 v4l2sink->state = STATE_PENDING_STREAMON;
673 GST_INFO_OBJECT (v4l2sink, "outputting buffers via mmap()");
675 if (v4l2sink->num_buffers != v4l2sink->pool->buffer_count) {
676 v4l2sink->num_buffers = v4l2sink->pool->buffer_count;
677 g_object_notify (G_OBJECT (v4l2sink), "queue-size");
680 v4l2sink->video_width = GST_V4L2_WIDTH (v4l2sink->v4l2object);
681 v4l2sink->video_height = GST_V4L2_HEIGHT (v4l2sink->v4l2object);
683 /* TODO: videosink width/height should be scaled according to
686 GST_VIDEO_SINK_WIDTH (v4l2sink) = v4l2sink->video_width;
687 GST_VIDEO_SINK_HEIGHT (v4l2sink) = v4l2sink->video_height;
689 v4l2sink->current_caps = gst_caps_ref (caps);
696 GST_DEBUG_OBJECT (v4l2sink, "failed to stop streaming");
701 /* error already posted */
702 GST_DEBUG_OBJECT (v4l2sink, "can't set format");
707 GST_DEBUG_OBJECT (v4l2sink, "we don't support streaming");
712 GST_DEBUG_OBJECT (v4l2sink, "can't create new pool");
717 /* called after A/V sync to render frame */
719 gst_v4l2sink_show_frame (GstBaseSink * bsink, GstBuffer * buf)
721 GstV4l2Sink *v4l2sink = GST_V4L2SINK (bsink);
722 GstBuffer *newbuf = NULL;
725 GST_DEBUG_OBJECT (v4l2sink, "render buffer: %p", buf);
727 meta = GST_META_V4L2_GET (buf);
734 GST_DEBUG_OBJECT (v4l2sink, "slow-path.. need to memcpy");
735 newbuf = gst_v4l2_buffer_pool_get (v4l2sink->pool, TRUE);
737 data = gst_buffer_map (buf, &size, NULL, GST_MAP_READ);
738 gst_buffer_fill (newbuf, 0, data, size);
739 gst_buffer_unmap (buf, data, size);
741 GST_DEBUG_OBJECT (v4l2sink, "render copied buffer: %p", newbuf);
746 if (!gst_v4l2_buffer_pool_qbuf (v4l2sink->pool, buf))
749 if (v4l2sink->state == STATE_PENDING_STREAMON) {
750 if (!gst_v4l2_object_start_streaming (v4l2sink->v4l2object)) {
751 return GST_FLOW_ERROR;
753 v4l2sink->state = STATE_STREAMING;
757 gst_buffer_ref (buf);
760 /* if the driver has more than one buffer, ie. more than just the one we
761 * just queued, then dequeue one immediately to make it available via
764 if (gst_v4l2_buffer_pool_available_buffers (v4l2sink->pool) >
765 v4l2sink->min_queued_bufs) {
766 GstBuffer *v4l2buf = gst_v4l2_buffer_pool_dqbuf (v4l2sink->pool);
768 /* note: if we get a buf, we don't want to use it directly (because
769 * someone else could still hold a ref).. but instead we release our
770 * reference to it, and if no one else holds a ref it will be returned
771 * to the pool of available buffers.. and if not, we keep looping.
774 gst_buffer_unref (v4l2buf);
783 GST_DEBUG_OBJECT (v4l2sink, "failed to queue buffer");
784 return GST_FLOW_ERROR;
790 gst_v4l2sink_navigation_send_event (GstNavigation * navigation,
791 GstStructure * structure)
793 GstV4l2Sink *v4l2sink = GST_V4L2SINK (navigation);
794 GstV4l2Xv *xv = v4l2sink->v4l2object->xv;
800 if ((peer = gst_pad_get_peer (GST_VIDEO_SINK_PAD (v4l2sink)))) {
801 GstVideoRectangle rect;
802 gdouble x, y, xscale = 1.0, yscale = 1.0;
804 gst_v4l2_xoverlay_get_render_rect (v4l2sink->v4l2object, &rect);
806 /* We calculate scaling using the original video frames geometry to
807 * include pixel aspect ratio scaling.
809 xscale = (gdouble) v4l2sink->video_width / rect.w;
810 yscale = (gdouble) v4l2sink->video_height / rect.h;
812 /* Converting pointer coordinates to the non scaled geometry */
813 if (gst_structure_get_double (structure, "pointer_x", &x)) {
814 x = MIN (x, rect.x + rect.w);
815 x = MAX (x - rect.x, 0);
816 gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
817 (gdouble) x * xscale, NULL);
819 if (gst_structure_get_double (structure, "pointer_y", &y)) {
820 y = MIN (y, rect.y + rect.h);
821 y = MAX (y - rect.y, 0);
822 gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
823 (gdouble) y * yscale, NULL);
826 gst_pad_send_event (peer, gst_event_new_navigation (structure));
827 gst_object_unref (peer);