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-rw-r--r--sys/v4l2/v4l2-overlay_calls.c168
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/v4l2/v4l2-overlay_calls.c b/sys/v4l2/v4l2-overlay_calls.c
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--- /dev/null
+++ b/sys/v4l2/v4l2-overlay_calls.c
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+/* G-Streamer generic V4L2 element - generic V4L2 overlay handling
+ * Copyright (C) 2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <errno.h>
+#include "v4l2_calls.h"
+
+#define DEBUG(format, args...) \
+ GST_DEBUG_ELEMENT(GST_CAT_PLUGIN_INFO, \
+ GST_ELEMENT(v4l2element), \
+ "V4L2-overlay: " format "\n", ##args)
+
+
+/******************************************************
+ * gst_v4l2_set_display():
+ * calls v4l-conf
+ * return value: TRUE on success, FALSE on error
+ ******************************************************/
+
+gboolean
+gst_v4l2_set_display (GstV4l2Element *v4l2element,
+ const gchar *display)
+{
+ gchar *buff;
+
+ DEBUG("trying to set overlay to '%s'", display);
+
+ /* start v4l-conf */
+ buff = g_strdup_printf("v4l-conf -q -c %s -d %s",
+ v4l2element->device?v4l2element->device:"/dev/video", display);
+
+ switch (system(buff)) {
+ case -1:
+ gst_element_error(GST_ELEMENT(v4l2element),
+ "Could not start v4l-conf: %s", sys_errlist[errno]);
+ g_free(buff);
+ return FALSE;
+ case 0:
+ break;
+ default:
+ gst_element_error(GST_ELEMENT(v4l2element),
+ "v4l-conf failed to run correctly: %s", sys_errlist[errno]);
+ g_free(buff);
+ return FALSE;
+ }
+
+ g_free(buff);
+ return TRUE;
+}
+
+
+/******************************************************
+ * gst_v4l2_set_vwin():
+ * does the VIDIOC_S_WIN ioctl()
+ * return value: TRUE on success, FALSE on error
+ ******************************************************/
+
+static gboolean
+gst_v4l2_set_vwin (GstV4l2Element *v4l2element)
+{
+ if (ioctl(v4l2element->video_fd, VIDIOC_S_WIN, &(v4l2element->vwin)) < 0) {
+ gst_element_error(GST_ELEMENT(v4l2element),
+ "Failed to set the video window on device %s: %s",
+ v4l2element->device, sys_errlist[errno]);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+
+/******************************************************
+ * gst_v4l2_set_window():
+ * sets the window where to display the video overlay
+ * return value: TRUE on success, FALSE on error
+ ******************************************************/
+
+gboolean
+gst_v4l2_set_window (GstV4l2Element *v4l2element,
+ gint x, gint y,
+ gint w, gint h)
+{
+ DEBUG("trying to set video window to %dx%d,%d,%d", x,y,w,h);
+ GST_V4L2_CHECK_OVERLAY(v4l2element);
+ GST_V4L2_CHECK_OPEN(v4l2element);
+
+ v4l2element->vwin.clipcount = 0;
+ v4l2element->vwin.x = x;
+ v4l2element->vwin.y = y;
+ v4l2element->vwin.width = w;
+ v4l2element->vwin.height = h;
+
+ return gst_v4l2_set_vwin(v4l2element);
+}
+
+
+/******************************************************
+ * gst_v4l_set_clips():
+ * sets video overlay clips
+ * return value: TRUE on success, FALSE on error
+ ******************************************************/
+
+gboolean
+gst_v4l2_set_clips (GstV4l2Element *v4l2element,
+ struct v4l2_clip *clips,
+ gint num_clips)
+{
+ DEBUG("trying to set video clipping information");
+ GST_V4L2_CHECK_OPEN(v4l2element);
+ GST_V4L2_CHECK_OVERLAY(v4l2element);
+
+ v4l2element->vwin.clips = clips;
+ v4l2element->vwin.clipcount = num_clips;
+
+ return gst_v4l2_set_vwin(v4l2element);
+}
+
+
+/******************************************************
+ * gst_v4l_set_overlay():
+ * enables/disables actual video overlay display
+ * return value: TRUE on success, FALSE on error
+ ******************************************************/
+
+gboolean
+gst_v4l2_enable_overlay (GstV4l2Element *v4l2element,
+ gboolean enable)
+{
+ gint doit = enable?1:0;
+
+ DEBUG("trying to %s overlay display", enable?"enable":"disable");
+ GST_V4L2_CHECK_OPEN(v4l2element);
+ GST_V4L2_CHECK_OVERLAY(v4l2element);
+
+ if (ioctl(v4l2element->video_fd, VIDIOC_PREVIEW, &doit) < 0) {
+ gst_element_error(GST_ELEMENT(v4l2element),
+ "Failed to %s overlay display for device %s: %s",
+ enable?"enable":"disable", v4l2element->device, sys_errlist[errno]);
+ return FALSE;
+ }
+
+ return TRUE;
+}