sys/v4l2/gstv4l2tuner.c

   1 /* GStreamer Tuner interface implementation
   2  * Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
   3  *
   4  * gstv4l2tuner.c: tuner interface implementation for V4L2
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public
  17  * License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25
  26 #include <gst/gst.h>
  27 #include <gst/tuner/tuner.h>
  28
  29 #include "gstv4l2tuner.h"
  30 #include "gstv4l2element.h"
  31 #include "v4l2_calls.h"
  32
  33 static void     gst_v4l2_tuner_channel_class_init (GstV4l2TunerChannelClass *klass);
  34 static void     gst_v4l2_tuner_channel_init     (GstV4l2TunerChannel *channel);
  35
  36 static void     gst_v4l2_tuner_norm_class_init  (GstV4l2TunerNormClass *klass);
  37 static void     gst_v4l2_tuner_norm_init        (GstV4l2TunerNorm *norm);
  38
  39 static const GList *
  40                 gst_v4l2_tuner_list_channels    (GstTuner        *mixer);
  41 static void     gst_v4l2_tuner_set_channel      (GstTuner        *mixer,
  42                                                  GstTunerChannel *channel);
  43 static const GstTunerChannel *
  44                 gst_v4l2_tuner_get_channel      (GstTuner        *mixer);
  45
  46 static const GList *
  47                 gst_v4l2_tuner_list_norms       (GstTuner        *mixer);
  48 static void     gst_v4l2_tuner_set_norm         (GstTuner        *mixer,
  49                                                  GstTunerNorm    *norm);
  50 static const GstTunerNorm *
  51                 gst_v4l2_tuner_get_norm         (GstTuner        *mixer);
  52
  53 static void     gst_v4l2_tuner_set_frequency    (GstTuner        *mixer,
  54                                                  GstTunerChannel *channel,
  55                                                  gulong           frequency);
  56 static gulong   gst_v4l2_tuner_get_frequency    (GstTuner        *mixer,
  57                                                  GstTunerChannel *channel);
  58 static gint     gst_v4l2_tuner_signal_strength  (GstTuner        *mixer,
  59                                                  GstTunerChannel *channel);
  60
  61 static GstTunerNormClass *norm_parent_class = NULL;
  62 static GstTunerChannelClass *channel_parent_class = NULL;
  63
  64 GType
  65 gst_v4l2_tuner_channel_get_type (void)
  66 {
  67   static GType gst_v4l2_tuner_channel_type = 0;
  68
  69   if (!gst_v4l2_tuner_channel_type) {
  70     static const GTypeInfo v4l2_tuner_channel_info = {
  71       sizeof (GstV4l2TunerChannelClass),
  72       NULL,
  73       NULL,
  74       (GClassInitFunc) gst_v4l2_tuner_channel_class_init,
  75       NULL,
  76       NULL,
  77       sizeof (GstV4l2TunerChannel),
  78       0,
  79       (GInstanceInitFunc) gst_v4l2_tuner_channel_init,
  80       NULL
  81     };
  82
  83     gst_v4l2_tuner_channel_type =
  84         g_type_register_static (GST_TYPE_TUNER_CHANNEL,
  85                                 "GstV4l2TunerChannel",
  86                                 &v4l2_tuner_channel_info, 0);
  87   }
  88
  89   return gst_v4l2_tuner_channel_type;
  90 }
  91
  92 static void
  93 gst_v4l2_tuner_channel_class_init (GstV4l2TunerChannelClass *klass)
  94 {
  95   channel_parent_class = g_type_class_ref (GST_TYPE_TUNER_CHANNEL);
  96 }
  97
  98 static void
  99 gst_v4l2_tuner_channel_init (GstV4l2TunerChannel *channel)
 100 {
 101   channel->index = 0;
 102   channel->tuner = 0;
 103   channel->audio = 0;
 104 }
 105
 106 GType
 107 gst_v4l2_tuner_norm_get_type (void)
 108 {
 109   static GType gst_v4l2_tuner_norm_type = 0;
 110
 111   if (!gst_v4l2_tuner_norm_type) {
 112     static const GTypeInfo v4l2_tuner_norm_info = {
 113       sizeof (GstV4l2TunerNormClass),
 114       NULL,
 115       NULL,
 116       (GClassInitFunc) gst_v4l2_tuner_norm_class_init,
 117       NULL,
 118       NULL,
 119       sizeof (GstV4l2TunerNorm),
 120       0,
 121       (GInstanceInitFunc) gst_v4l2_tuner_norm_init,
 122       NULL
 123     };
 124
 125     gst_v4l2_tuner_norm_type =
 126         g_type_register_static (GST_TYPE_TUNER_NORM,
 127                                 "GstV4l2TunerNorm",
 128                                 &v4l2_tuner_norm_info, 0);
 129   }
 130
 131   return gst_v4l2_tuner_norm_type;
 132 }
 133
 134 static void
 135 gst_v4l2_tuner_norm_class_init (GstV4l2TunerNormClass *klass)
 136 {
 137   norm_parent_class = g_type_class_ref (GST_TYPE_TUNER_NORM);
 138 }
 139
 140 static void
 141 gst_v4l2_tuner_norm_init (GstV4l2TunerNorm *norm)
 142 {
 143   norm->index = 0;
 144 }
 145
 146 void
 147 gst_v4l2_tuner_interface_init (GstTunerClass *klass)
 148 {
 149   /* default virtual functions */
 150   klass->list_channels = gst_v4l2_tuner_list_channels;
 151   klass->set_channel = gst_v4l2_tuner_set_channel;
 152   klass->get_channel = gst_v4l2_tuner_get_channel;
 153
 154   klass->list_norms = gst_v4l2_tuner_list_norms;
 155   klass->set_norm = gst_v4l2_tuner_set_norm;
 156   klass->get_norm = gst_v4l2_tuner_get_norm;
 157
 158   klass->set_frequency = gst_v4l2_tuner_set_frequency;
 159   klass->get_frequency = gst_v4l2_tuner_get_frequency;
 160   klass->signal_strength = gst_v4l2_tuner_signal_strength;
 161 }
 162
 163 static gboolean
 164 gst_v4l2_tuner_is_sink (GstV4l2Element *v4l2element)
 165 {
 166   const GList *pads = gst_element_get_pad_list (GST_ELEMENT (v4l2element));
 167   GstPadDirection dir = GST_PAD_UNKNOWN;
 168
 169   /* get direction */
 170   if (pads && g_list_length ((GList *) pads) == 1)
 171     dir = GST_PAD_DIRECTION (GST_PAD (pads->data));
 172
 173   return (dir == GST_PAD_SINK);
 174 }
 175
 176 static gboolean
 177 gst_v4l2_tuner_contains_channel (GstV4l2Element      *v4l2element,
 178                                  GstV4l2TunerChannel *v4l2channel)
 179 {
 180   const GList *item;
 181
 182   for (item = v4l2element->channels; item != NULL; item = item->next)
 183     if (item->data == v4l2channel)
 184       return TRUE;
 185
 186   return FALSE;
 187 }
 188
 189 static const GList *
 190 gst_v4l2_tuner_list_channels (GstTuner *mixer)
 191 {
 192   /* ... or output, if we're a sink... */
 193   return GST_V4L2ELEMENT (mixer)->channels;
 194 }
 195
 196 static void
 197 gst_v4l2_tuner_set_channel (GstTuner        *mixer,
 198                             GstTunerChannel *channel)
 199 {
 200   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 201   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 202
 203   /* assert that we're opened and that we're using a known item */
 204   g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
 205   g_return_if_fail (gst_v4l2_tuner_contains_channel (v4l2element, v4l2channel));
 206
 207   /* ... or output, if we're a sink... */
 208   if (gst_v4l2_tuner_is_sink (v4l2element))
 209     gst_v4l2_set_output (v4l2element, v4l2channel->index);
 210   else
 211     gst_v4l2_set_input (v4l2element, v4l2channel->index);
 212 }
 213
 214 static const GstTunerChannel *
 215 gst_v4l2_tuner_get_channel (GstTuner *mixer)
 216 {
 217   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 218   GList *item;
 219   gint channel;
 220
 221   /* assert that we're opened and that we're using a known item */
 222   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
 223
 224   /* ... or output, if we're a sink... */
 225   if (gst_v4l2_tuner_is_sink (v4l2element))
 226     gst_v4l2_get_output (v4l2element, &channel);
 227   else
 228     gst_v4l2_get_input (v4l2element, &channel);
 229
 230   for (item = v4l2element->channels; item != NULL; item = item->next) {
 231     if (channel == GST_V4L2_TUNER_CHANNEL (item->data)->index)
 232       return (const GstTunerChannel *) item->data;
 233   }
 234
 235   return NULL;
 236 }
 237
 238 static gboolean
 239 gst_v4l2_tuner_contains_norm (GstV4l2Element   *v4l2element,
 240                               GstV4l2TunerNorm *v4l2norm)
 241 {
 242   const GList *item;
 243
 244   for (item = v4l2element->norms; item != NULL; item = item->next)
 245     if (item->data == v4l2norm)
 246       return TRUE;
 247
 248   return FALSE;
 249 }
 250
 251 static const GList *
 252 gst_v4l2_tuner_list_norms (GstTuner *mixer)
 253 {
 254   return GST_V4L2ELEMENT (mixer)->norms;
 255 }
 256
 257 static void
 258 gst_v4l2_tuner_set_norm (GstTuner     *mixer,
 259                          GstTunerNorm *norm)
 260 {
 261   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 262   GstV4l2TunerNorm *v4l2norm = GST_V4L2_TUNER_NORM (norm);
 263
 264   /* assert that we're opened and that we're using a known item */
 265   g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
 266   g_return_if_fail (gst_v4l2_tuner_contains_norm (v4l2element, v4l2norm));
 267
 268   gst_v4l2_set_norm (v4l2element, v4l2norm->index);
 269 }
 270
 271 static const GstTunerNorm *
 272 gst_v4l2_tuner_get_norm (GstTuner *mixer)
 273 {
 274   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 275   GList *item;
 276   v4l2_std_id norm;
 277
 278   /* assert that we're opened and that we're using a known item */
 279   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
 280
 281   gst_v4l2_get_norm (v4l2element, &norm);
 282
 283   for (item = v4l2element->norms; item != NULL; item = item->next) {
 284     if (norm == GST_V4L2_TUNER_NORM (item->data)->index)
 285       return (const GstTunerNorm *) item->data;
 286   }
 287
 288   return NULL;
 289 }
 290
 291 static void
 292 gst_v4l2_tuner_set_frequency (GstTuner        *mixer,
 293                               GstTunerChannel *channel,
 294                               gulong           frequency)
 295 {
 296   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 297   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 298   gint chan;
 299
 300   /* assert that we're opened and that we're using a known item */
 301   g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
 302   g_return_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 303                         GST_TUNER_CHANNEL_FREQUENCY));
 304   g_return_if_fail (gst_v4l2_tuner_contains_channel (v4l2element, v4l2channel));
 305
 306   gst_v4l2_get_input (v4l2element, &chan);
 307   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 308       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 309     gst_v4l2_set_frequency (v4l2element, v4l2channel->tuner, frequency);
 310   }
 311 }
 312
 313 static gulong
 314 gst_v4l2_tuner_get_frequency (GstTuner        *mixer,
 315                               GstTunerChannel *channel)
 316 {
 317   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 318   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 319   gint chan;
 320   gulong frequency = 0;
 321
 322   /* assert that we're opened and that we're using a known item */
 323   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
 324   g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 325                                 GST_TUNER_CHANNEL_FREQUENCY), 0);
 326   g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
 327                                                          v4l2channel), 0);
 328
 329   gst_v4l2_get_input (v4l2element, &chan);
 330   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 331       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 332     gst_v4l2_get_frequency (v4l2element, v4l2channel->tuner, &frequency);
 333   }
 334
 335   return frequency;
 336 }
 337
 338 static gint
 339 gst_v4l2_tuner_signal_strength (GstTuner        *mixer,
 340                                 GstTunerChannel *channel)
 341 {
 342   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 343   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 344   gint chan;
 345   gulong signal = 0;
 346
 347   /* assert that we're opened and that we're using a known item */
 348   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
 349   g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 350                                 GST_TUNER_CHANNEL_FREQUENCY), 0);
 351   g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
 352                                                          v4l2channel), 0);
 353
 354   gst_v4l2_get_input (v4l2element, &chan);
 355   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 356       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 357     gst_v4l2_signal_strength (v4l2element, v4l2channel->tuner, &signal);
 358   }
 359
 360   return signal;
 361 }