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1 /* GStreamer |
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2 * |
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3 * v4l_calls.h: header for generic V4L calls |
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4 * |
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5 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net> |
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6 * |
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7 * This library is free software; you can redistribute it and/or |
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8 * modify it under the terms of the GNU Library General Public |
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9 * License as published by the Free Software Foundation; either |
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10 * version 2 of the License, or (at your option) any later version. |
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11 * |
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12 * This library is distributed in the hope that it will be useful, |
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Library General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU Library General Public |
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18 * License along with this library; if not, write to the |
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19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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20 * Boston, MA 02111-1307, USA. |
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21 */ |
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22 |
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23 #ifndef __V4L_CALLS_H__ |
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24 #define __V4L_CALLS_H__ |
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25 |
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26 #include "gstv4lelement.h" |
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27 #include "gst/gst-i18n-plugin.h" |
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28 |
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29 |
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30 G_BEGIN_DECLS |
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31 |
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32 |
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33 /* simple check whether the device is open */ |
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34 #define GST_V4L_IS_OPEN(element) \ |
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35 (GST_V4LELEMENT (element)->video_fd > 0) |
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36 |
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37 /* check whether the device is 'active' */ |
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38 #define GST_V4L_IS_ACTIVE(element) \ |
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39 (GST_V4LELEMENT (element)->buffer != NULL) |
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40 |
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41 #define GST_V4L_IS_OVERLAY(element) \ |
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42 (GST_V4LELEMENT (element)->vcap.type & VID_TYPE_OVERLAY) |
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43 |
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44 /* checks whether the current v4lelement has already been open()'ed or not */ |
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45 #define GST_V4L_CHECK_OPEN(element) \ |
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46 if (!GST_V4L_IS_OPEN (element)) \ |
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47 { \ |
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48 GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \ |
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49 (_("Device is not open.")), (NULL)); \ |
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50 return FALSE; \ |
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51 } |
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52 |
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53 /* checks whether the current v4lelement is close()'ed or whether it is still open */ |
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54 #define GST_V4L_CHECK_NOT_OPEN(element) \ |
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55 if (GST_V4L_IS_OPEN (element)) \ |
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56 { \ |
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57 GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \ |
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58 (_("Device is open.")), (NULL)); \ |
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59 return FALSE; \ |
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60 } |
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61 |
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62 /* checks whether the current v4lelement does video overlay */ |
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63 #define GST_V4L_CHECK_OVERLAY(element) \ |
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64 if (!(element->vcap.type & VID_TYPE_OVERLAY)) \ |
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65 { \ |
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66 GST_ELEMENT_ERROR (element, RESOURCE, TOO_LAZY, \ |
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67 (NULL), ("Device cannot handle overlay")); \ |
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68 return FALSE; \ |
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69 } |
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70 |
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71 /* checks whether we're in capture mode or not */ |
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72 #define GST_V4L_CHECK_ACTIVE(element) \ |
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73 if (!GST_V4L_IS_ACTIVE (element)) \ |
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74 { \ |
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75 GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \ |
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76 (NULL), ("Device is not in streaming mode")); \ |
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77 return FALSE; \ |
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78 } |
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79 |
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80 /* checks whether we're out of capture mode or not */ |
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81 #define GST_V4L_CHECK_NOT_ACTIVE(element) \ |
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82 if (GST_V4L_IS_ACTIVE (element)) \ |
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83 { \ |
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84 GST_ELEMENT_ERROR (element, RESOURCE, SETTINGS, \ |
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85 (NULL), ("Device is in streaming mode")); \ |
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86 return FALSE; \ |
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87 } |
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88 |
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89 |
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90 typedef enum { |
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91 V4L_PICTURE_HUE = 0, |
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92 V4L_PICTURE_BRIGHTNESS, |
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93 V4L_PICTURE_CONTRAST, |
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94 V4L_PICTURE_SATURATION, |
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95 } GstV4lPictureType; |
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96 |
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97 typedef enum { |
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98 V4L_AUDIO_VOLUME = 0, |
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99 V4L_AUDIO_MUTE, |
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100 V4L_AUDIO_MODE, /* stereo, mono, ... (see videodev.h) */ |
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101 } GstV4lAudioType; |
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102 |
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103 |
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104 /* open/close the device */ |
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105 gboolean gst_v4l_open (GstV4lElement *v4lelement); |
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106 gboolean gst_v4l_close (GstV4lElement *v4lelement); |
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107 |
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108 /* norm control (norm = VIDEO_MODE_{PAL|NTSC|SECAM|AUTO}) */ |
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109 gboolean gst_v4l_get_chan_norm (GstV4lElement *v4lelement, |
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110 gint *channel, |
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111 gint *norm); |
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112 gboolean gst_v4l_set_chan_norm (GstV4lElement *v4lelement, |
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113 gint channel, |
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114 gint norm); |
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115 GList *gst_v4l_get_chan_names (GstV4lElement *v4lelement); |
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116 |
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117 /* frequency control */ |
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118 gboolean gst_v4l_get_signal (GstV4lElement *v4lelement, |
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119 gint tunernum, |
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120 guint *signal); |
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121 gboolean gst_v4l_get_frequency (GstV4lElement *v4lelement, |
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122 gint tunernum, |
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123 gulong *frequency); |
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124 gboolean gst_v4l_set_frequency (GstV4lElement *v4lelement, |
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125 gint tunernum, |
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126 gulong frequency); |
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127 |
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128 /* picture control */ |
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129 gboolean gst_v4l_get_picture (GstV4lElement *v4lelement, |
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130 GstV4lPictureType type, |
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131 gint *value); |
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132 gboolean gst_v4l_set_picture (GstV4lElement *v4lelement, |
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133 GstV4lPictureType type, |
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134 gint value); |
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135 |
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136 /* audio control */ |
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137 gboolean gst_v4l_get_audio (GstV4lElement *v4lelement, |
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138 gint audionum, |
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139 GstV4lAudioType type, |
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140 gint *value); |
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141 gboolean gst_v4l_set_audio (GstV4lElement *v4lelement, |
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142 gint audionum, |
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143 GstV4lAudioType type, |
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144 gint value); |
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145 |
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146 /* functions that v4lsrc needs */ |
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147 gboolean gst_v4l_set_window_properties (GstV4lElement * v4lelement); |
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148 gboolean gst_v4l_get_capabilities (GstV4lElement * v4lelement); |
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149 |
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150 |
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151 G_END_DECLS |
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152 |
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153 |
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154 #endif /* __V4L_CALLS_H__ */ |