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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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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!
158 lines
5.2 KiB
C
158 lines
5.2 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 __V4L_CALLS_H__
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#define __V4L_CALLS_H__
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#include "gstv4lelement.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* simple check whether the device is open */
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#define GST_V4L_IS_OPEN(v4lelement) \
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(v4lelement->video_fd > 0)
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/* check whether the device is 'active' */
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#define GST_V4L_IS_ACTIVE(v4lelement) \
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(v4lelement->buffer != NULL)
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#define GST_V4L_IS_OVERLAY(v4lelement) \
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(v4lelement->vcap.type & VID_TYPE_OVERLAY)
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/* checks whether the current v4lelement has already been open()'ed or not */
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#define GST_V4L_CHECK_OPEN(v4lelement) \
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if (v4lelement->video_fd <= 0) \
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{ \
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gst_element_error(GST_ELEMENT(v4lelement), \
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"Device is not open"); \
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return FALSE; \
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}
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/* checks whether the current v4lelement is close()'ed or whether it is still open */
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#define GST_V4L_CHECK_NOT_OPEN(v4lelement) \
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if (v4lelement->video_fd != -1) \
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{ \
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gst_element_error(GST_ELEMENT(v4lelement), \
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"Device is open"); \
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return FALSE; \
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}
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/* checks whether the current v4lelement does video overlay */
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#define GST_V4L_CHECK_OVERLAY(v4lelement) \
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if (!(v4lelement->vcap.type & VID_TYPE_OVERLAY)) \
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{ \
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gst_element_error(GST_ELEMENT(v4lelement), \
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"Device doesn't do overlay"); \
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return FALSE; \
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}
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/* checks whether we're in capture mode or not */
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#define GST_V4L_CHECK_ACTIVE(v4lelement) \
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if (v4lelement->buffer == NULL) \
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{ \
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gst_element_error(GST_ELEMENT(v4lelement), \
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"Device is not in streaming mode"); \
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return FALSE; \
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}
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/* checks whether we're out of capture mode or not */
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#define GST_V4L_CHECK_NOT_ACTIVE(v4lelement) \
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if (v4lelement->buffer != NULL) \
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{ \
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gst_element_error(GST_ELEMENT(v4lelement), \
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"Device is in streaming mode"); \
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return FALSE; \
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}
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typedef enum {
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V4L_PICTURE_HUE = 0,
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V4L_PICTURE_BRIGHTNESS,
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V4L_PICTURE_CONTRAST,
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V4L_PICTURE_SATURATION,
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} GstV4lPictureType;
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typedef enum {
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V4L_AUDIO_VOLUME = 0,
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V4L_AUDIO_MUTE,
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V4L_AUDIO_MODE, /* stereo, mono, ... (see videodev.h) */
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} GstV4lAudioType;
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/* open/close the device */
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gboolean gst_v4l_open (GstV4lElement *v4lelement);
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gboolean gst_v4l_close (GstV4lElement *v4lelement);
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/* norm control (norm = VIDEO_MODE_{PAL|NTSC|SECAM|AUTO}) */
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gboolean gst_v4l_get_chan_norm (GstV4lElement *v4lelement,
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gint *channel,
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gint *norm);
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gboolean gst_v4l_set_chan_norm (GstV4lElement *v4lelement,
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gint channel,
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gint norm);
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GList *gst_v4l_get_chan_names (GstV4lElement *v4lelement);
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/* frequency control */
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gboolean gst_v4l_get_signal (GstV4lElement *v4lelement,
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gint tunernum,
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guint *signal);
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gboolean gst_v4l_get_frequency (GstV4lElement *v4lelement,
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gint tunernum,
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gulong *frequency);
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gboolean gst_v4l_set_frequency (GstV4lElement *v4lelement,
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gint tunernum,
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gulong frequency);
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/* picture control */
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gboolean gst_v4l_get_picture (GstV4lElement *v4lelement,
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GstV4lPictureType type,
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gint *value);
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gboolean gst_v4l_set_picture (GstV4lElement *v4lelement,
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GstV4lPictureType type,
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gint value);
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/* audio control */
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gboolean gst_v4l_get_audio (GstV4lElement *v4lelement,
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gint audionum,
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GstV4lAudioType type,
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gint *value);
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gboolean gst_v4l_set_audio (GstV4lElement *v4lelement,
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gint audionum,
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GstV4lAudioType type,
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gint value);
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/* overlay */
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gboolean gst_v4l_set_overlay (GstV4lElement *v4lelement);
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gboolean gst_v4l_set_window (GstElement *element,
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gint x, gint y,
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gint w, gint h,
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struct video_clip *clips,
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gint num_clips);
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gboolean gst_v4l_enable_overlay (GstV4lElement *v4lelement,
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gboolean enable);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __V4L_CALLS_H__ */
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