gstreamer/sys/v4l/v4l_calls.h

/* G-Streamer generic V4L element - generic V4L calls handling
 * Copyright (C) 2001-2002 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.
 */

#ifndef __V4L_CALLS_H__
#define __V4L_CALLS_H__

#include "gstv4lelement.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */


/* simple check whether the device is open */
#define GST_V4L_IS_OPEN(v4lelement) \
  (v4lelement->video_fd > 0)

/* check whether the device is 'active' */
#define GST_V4L_IS_ACTIVE(v4lelement) \
  (v4lelement->buffer != NULL)

#define GST_V4L_IS_OVERLAY(v4lelement) \
  (v4lelement->vcap.type & VID_TYPE_OVERLAY)

/* checks whether the current v4lelement has already been open()'ed or not */
#define GST_V4L_CHECK_OPEN(v4lelement) \
  if (v4lelement->video_fd <= 0)               \
  {                                            \
    gst_element_error(GST_ELEMENT(v4lelement), \
      "Device is not open");                   \
    return FALSE;                              \
  }

/* checks whether the current v4lelement is close()'ed or whether it is still open */
#define GST_V4L_CHECK_NOT_OPEN(v4lelement) \
  if (v4lelement->video_fd != -1)              \
  {                                            \
    gst_element_error(GST_ELEMENT(v4lelement), \
      "Device is open");                       \
    return FALSE;                              \
  }

/* checks whether the current v4lelement does video overlay */
#define GST_V4L_CHECK_OVERLAY(v4lelement) \
  if (!(v4lelement->vcap.type & VID_TYPE_OVERLAY)) \
  {                                                \
    gst_element_error(GST_ELEMENT(v4lelement),     \
      "Device doesn't do overlay");               \
    return FALSE;                                  \
  }

/* checks whether we're in capture mode or not */
#define GST_V4L_CHECK_ACTIVE(v4lelement) \
  if (v4lelement->buffer == NULL)              \
  {                                            \
    gst_element_error(GST_ELEMENT(v4lelement), \
      "Device is not in streaming mode");      \
    return FALSE;                              \
  }

/* checks whether we're out of capture mode or not */
#define GST_V4L_CHECK_NOT_ACTIVE(v4lelement) \
  if (v4lelement->buffer != NULL)              \
  {                                            \
    gst_element_error(GST_ELEMENT(v4lelement), \
      "Device is in streaming mode");          \
    return FALSE;                              \
  }


typedef enum {
  V4L_PICTURE_HUE = 0,
  V4L_PICTURE_BRIGHTNESS,
  V4L_PICTURE_CONTRAST,
  V4L_PICTURE_SATURATION,
} GstV4lPictureType;

typedef enum {
  V4L_AUDIO_VOLUME = 0,
  V4L_AUDIO_MUTE,
  V4L_AUDIO_MODE, /* stereo, mono, ... (see videodev.h) */
} GstV4lAudioType;


/* open/close the device */
gboolean gst_v4l_open           (GstV4lElement *v4lelement);
gboolean gst_v4l_close          (GstV4lElement *v4lelement);

/* norm control (norm = VIDEO_MODE_{PAL|NTSC|SECAM|AUTO}) */
gboolean gst_v4l_get_chan_norm  (GstV4lElement *v4lelement,
				 gint          *channel,
				 gint          *norm);
gboolean gst_v4l_set_chan_norm  (GstV4lElement *v4lelement,
				 gint           channel,
				 gint           norm);
GList   *gst_v4l_get_chan_names (GstV4lElement *v4lelement);

/* frequency control */
gboolean gst_v4l_get_signal     (GstV4lElement *v4lelement,
				 gint           tunernum,
				 guint         *signal);
gboolean gst_v4l_get_frequency  (GstV4lElement *v4lelement,
				 gint           tunernum,
				 gulong        *frequency);
gboolean gst_v4l_set_frequency  (GstV4lElement *v4lelement,
				 gint           tunernum,
				 gulong         frequency);

/* picture control */
gboolean gst_v4l_get_picture    (GstV4lElement *v4lelement,
				 GstV4lPictureType type,
				 gint          *value);
gboolean gst_v4l_set_picture    (GstV4lElement *v4lelement,	
				 GstV4lPictureType type,
				 gint           value);

/* audio control */
gboolean gst_v4l_get_audio      (GstV4lElement *v4lelement,
				 gint           audionum,
				 GstV4lAudioType type,
				 gint          *value);
gboolean gst_v4l_set_audio      (GstV4lElement *v4lelement,
				 gint           audionum,
				 GstV4lAudioType type,
				 gint           value);

/* overlay */
gboolean gst_v4l_set_overlay    (GstV4lElement *v4lelement);
gboolean gst_v4l_set_window     (GstElement    *element,
				 gint x,        gint y,
				 gint w,        gint h,
				 struct video_clip *clips,
				 gint           num_clips);
gboolean gst_v4l_enable_overlay (GstV4lElement *v4lelement,
				 gboolean       enable);


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __V4L_CALLS_H__ */