mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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33bfd20100
Original commit message from CVS: Unification of the way to speak to v4l2 and v4l elements... Also fix a segfautl when doing gst-inspect v4l2src
154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/* G-Streamer generic V4L element - generic V4L overlay handling
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <errno.h>
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#include "v4l_calls.h"
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#define DEBUG(format, args...) \
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GST_DEBUG_ELEMENT(GST_CAT_PLUGIN_INFO, \
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GST_ELEMENT(v4lelement), \
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"V4L-overlay: " format, ##args)
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/******************************************************
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* gst_v4l_set_overlay():
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* calls v4l-conf
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4l_set_overlay (GstV4lElement *v4lelement,
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gchar *display)
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{
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gchar *buff;
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DEBUG("setting display to '%s'", display);
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GST_V4L_CHECK_NOT_OPEN(v4lelement);
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/* start v4l-conf */
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buff = g_strdup_printf("v4l-conf -q -c %s -d %s",
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v4lelement->videodev?v4lelement->videodev:"/dev/video", display);
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switch (system(buff))
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{
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case -1:
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gst_element_error(GST_ELEMENT(v4lelement),
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"Could not start v4l-conf: %s", g_strerror(errno));
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g_free(buff);
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return FALSE;
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case 0:
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break;
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default:
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gst_element_error(GST_ELEMENT(v4lelement),
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"v4l-conf failed to run correctly: %s", g_strerror(errno));
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g_free(buff);
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return FALSE;
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}
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g_free(buff);
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return TRUE;
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}
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/******************************************************
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* gst_v4l_set_window():
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* sets the window where to display the video overlay
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4l_set_window (GstElement *element,
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gint x,
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gint y,
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gint w,
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gint h,
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struct video_clip *clips,
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gint num_clips)
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{
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GstV4lElement *v4lelement = GST_V4LELEMENT(element);
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struct video_window vwin;
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DEBUG("setting video window to position (x,y/wxh) = %d,%d/%dx%d",
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x, y, w, h);
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GST_V4L_CHECK_OPEN(v4lelement);
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GST_V4L_CHECK_OVERLAY(v4lelement);
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vwin.x = x;
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vwin.y = y;
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vwin.width = w;
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vwin.height = h;
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vwin.flags = 0;
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if (clips && !(v4lelement->vcap.type & VID_TYPE_CLIPPING))
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{
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DEBUG("Device \'%s\' doesn't do clipping",
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v4lelement->videodev?v4lelement->videodev:"/dev/video");
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vwin.clips = 0;
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}
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else
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{
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vwin.clips = clips;
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vwin.clipcount = num_clips;
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}
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if (ioctl(v4lelement->video_fd, VIDIOCSWIN, &vwin) < 0)
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{
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gst_element_error(GST_ELEMENT(v4lelement),
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"Failed to set the video window: %s",
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g_strerror(errno));
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return FALSE;
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}
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return TRUE;
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}
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/******************************************************
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* gst_v4l_set_overlay():
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* enables/disables actual video overlay display
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* return value: TRUE on success, FALSE on error
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******************************************************/
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gboolean
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gst_v4l_enable_overlay (GstV4lElement *v4lelement,
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gboolean enable)
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{
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gint doit = enable?1:0;
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DEBUG("%s overlay", enable?"enabling":"disabling");
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GST_V4L_CHECK_OPEN(v4lelement);
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GST_V4L_CHECK_OVERLAY(v4lelement);
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if (ioctl(v4lelement->video_fd, VIDIOCCAPTURE, &doit) < 0)
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{
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gst_element_error(GST_ELEMENT(v4lelement),
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"Failed to %s overlay display: %s",
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enable?"enable":"disable", g_strerror(errno));
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return FALSE;
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}
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return TRUE;
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}
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