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141 lines
4 KiB
C
141 lines
4 KiB
C
/* G-Streamer generic V4L2 element - generic V4L2 overlay handling
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* Copyright (C) 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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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 "v4l2_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(v4l2element), \
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"V4L2-overlay: " format, ##args)
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/******************************************************
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* gst_v4l2_set_display():
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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_v4l2_set_display (GstV4l2Element *v4l2element,
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const gchar *display)
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{
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gchar *buff;
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DEBUG("trying to set overlay to '%s'", display);
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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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v4l2element->device?v4l2element->device:"/dev/video", display);
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switch (system(buff)) {
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case -1:
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gst_element_error(GST_ELEMENT(v4l2element),
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"Could not start v4l-conf: %s", 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(v4l2element),
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"v4l-conf failed to run correctly: %s", 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_v4l2_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_v4l2_set_window (GstV4l2Element *v4l2element,
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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 v4l2_clip *clips,
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gint num_clips)
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{
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struct v4l2_window vwin;
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DEBUG("trying to set video window to %dx%d,%d,%d", x,y,w,h);
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GST_V4L2_CHECK_OVERLAY(v4l2element);
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GST_V4L2_CHECK_OPEN(v4l2element);
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vwin.clipcount = 0;
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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.clips = clips;
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vwin.clipcount = num_clips;
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if (ioctl(v4l2element->video_fd, VIDIOC_S_WIN, &vwin) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to set the video window on device %s: %s",
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v4l2element->device, 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_v4l2_enable_overlay (GstV4l2Element *v4l2element,
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gboolean enable)
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{
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gint doit = enable?1:0;
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DEBUG("trying to %s overlay display", enable?"enable":"disable");
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GST_V4L2_CHECK_OPEN(v4l2element);
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GST_V4L2_CHECK_OVERLAY(v4l2element);
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if (ioctl(v4l2element->video_fd, VIDIOC_PREVIEW, &doit) < 0) {
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gst_element_error(GST_ELEMENT(v4l2element),
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"Failed to %s overlay display for device %s: %s",
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enable?"enable":"disable", v4l2element->device, 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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