diff options
Diffstat (limited to 'sys/v4l2/v4l2-overlay_calls.c')
| -rw-r--r-- | sys/v4l2/v4l2-overlay_calls.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sys/v4l2/v4l2-overlay_calls.c b/sys/v4l2/v4l2-overlay_calls.c new file mode 100644 index 00000000..89cae62b --- /dev/null +++ b/sys/v4l2/v4l2-overlay_calls.c @@ -0,0 +1,168 @@ +/* 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; +} |