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0f124a569d
Original commit message from CVS: Some interface implementations for video4linux/video4linux2 plugins: * a Tuner interface, with which one can select inputs and stations. Audio work is underway here, but unfinished. * A Xoverlay interface with which one can do simple overlay. Similar to the API of the v4l/Xv XFree86 extension. Widget implementation for GTK-2.0 coming up in the sandbox. * Colorbalance - for adapting colors (brightness, contrast, etc.) - pretty basic and maybe somewhat overdesigned. But it'll do for now. Apart from these interfaces, there's also a loadable library 'xwindowlistener' that listenes to X for the movement of a window and the overlap of other windows. This is partly copied from xawtv (and thus partly GPL :(), but it's needed for the xoverlay interface implementation in the v4l/v4l2 elements. Lastly, some small changes to remove redundant properties from the v4l/v4l2 elements since these can be done much simpler. Comments appreciated!
117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/* G-Streamer generic V4L element - generic V4L calls 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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#ifndef __GST_V4LELEMENT_H__
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#define __GST_V4LELEMENT_H__
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#include <gst/gst.h>
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#include <gst/xwindowlistener/xwindowlistener.h>
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/* Because of some really cool feature in video4linux1, also known as
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* 'not including sys/types.h and sys/time.h', we had to include it
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* ourselves. In all their intelligence, these people decided to fix
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* this in the next version (video4linux2) in such a cool way that it
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* breaks all compilations of old stuff...
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* The real problem is actually that linux/time.h doesn't use proper
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* macro checks before defining types like struct timeval. The proper
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* fix here is to either fuck the kernel header (which is what we do
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* by defining _LINUX_TIME_H, an innocent little hack) or by fixing it
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* upstream, which I'll consider doing later on. If you get compiler
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* errors here, check your linux/time.h && sys/time.h header setup.
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*/
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#include <sys/types.h>
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#define _LINUX_TIME_H
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#include <linux/videodev.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_V4LELEMENT \
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(gst_v4lelement_get_type())
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#define GST_V4LELEMENT(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4LELEMENT,GstV4lElement))
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#define GST_V4LELEMENT_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4LELEMENT,GstV4lElementClass))
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#define GST_IS_V4LELEMENT(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4LELEMENT))
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#define GST_IS_V4LELEMENT_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4LELEMENT))
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typedef struct _GstV4lElement GstV4lElement;
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typedef struct _GstV4lElementClass GstV4lElementClass;
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struct _GstV4lElement {
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GstElement element;
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/* the video device */
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char *videodev;
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/* the video-device's file descriptor */
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gint video_fd;
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/* the video buffer (mmap()'ed) */
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guint8 *buffer;
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/* the video-device's capabilities */
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struct video_capability vcap;
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/* some more info about the current input's capabilities */
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struct video_channel vchan;
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/* lists... */
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GList *colors;
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GList *norms;
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GList *channels;
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/* X-overlay */
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GstXWindowListener *overlay;
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XID xwindow_id;
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/* caching values */
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gchar *display;
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};
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struct _GstV4lElementClass {
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GstElementClass parent_class;
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/* signals */
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void (*open) (GstElement *element,
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const gchar *device);
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void (*close) (GstElement *element,
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const gchar *device);
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/* actions */
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gboolean (*get_attribute) (GstElement *element,
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const gchar *attr_name,
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int *value);
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gboolean (*set_attribute) (GstElement *element,
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const gchar *attr_name,
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const int value);
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};
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GType gst_v4lelement_get_type(void);
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gboolean gst_v4lelement_factory_init (GstPlugin *plugin);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_V4LELEMENT_H__ */
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