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 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 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       gst_v4l2_set_input (v4l2element, v4l2channel->index)) {
 211     gst_tuner_channel_changed (mixer, channel);
 212     g_object_notify (G_OBJECT (v4l2element), "channel");
 213   }
 214 }
 215
 216 static GstTunerChannel *
 217 gst_v4l2_tuner_get_channel (GstTuner *mixer)
 218 {
 219   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 220   GList *item;
 221   gint channel;
 222
 223   /* assert that we're opened and that we're using a known item */
 224   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
 225
 226   /* ... or output, if we're a sink... */
 227   if (gst_v4l2_tuner_is_sink (v4l2element))
 228     gst_v4l2_get_output (v4l2element, &channel);
 229   else
 230     gst_v4l2_get_input (v4l2element, &channel);
 231
 232   for (item = v4l2element->channels; item != NULL; item = item->next) {
 233     if (channel == GST_V4L2_TUNER_CHANNEL (item->data)->index)
 234       return (GstTunerChannel *) item->data;
 235   }
 236
 237   return NULL;
 238 }
 239
 240 static gboolean
 241 gst_v4l2_tuner_contains_norm (GstV4l2Element   *v4l2element,
 242                               GstV4l2TunerNorm *v4l2norm)
 243 {
 244   const GList *item;
 245
 246   for (item = v4l2element->norms; item != NULL; item = item->next)
 247     if (item->data == v4l2norm)
 248       return TRUE;
 249
 250   return FALSE;
 251 }
 252
 253 static const GList *
 254 gst_v4l2_tuner_list_norms (GstTuner *mixer)
 255 {
 256   return GST_V4L2ELEMENT (mixer)->norms;
 257 }
 258
 259 static void
 260 gst_v4l2_tuner_set_norm (GstTuner     *mixer,
 261                          GstTunerNorm *norm)
 262 {
 263   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 264   GstV4l2TunerNorm *v4l2norm = GST_V4L2_TUNER_NORM (norm);
 265
 266   /* assert that we're opened and that we're using a known item */
 267   g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
 268   g_return_if_fail (gst_v4l2_tuner_contains_norm (v4l2element, v4l2norm));
 269
 270   if (gst_v4l2_set_norm (v4l2element, v4l2norm->index)) {
 271     gst_tuner_norm_changed (mixer, norm);
 272     g_object_notify (G_OBJECT (v4l2element), "norm");
 273   }
 274 }
 275
 276 static GstTunerNorm *
 277 gst_v4l2_tuner_get_norm (GstTuner *mixer)
 278 {
 279   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 280   GList *item;
 281   v4l2_std_id norm;
 282
 283   /* assert that we're opened and that we're using a known item */
 284   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), NULL);
 285
 286   gst_v4l2_get_norm (v4l2element, &norm);
 287
 288   for (item = v4l2element->norms; item != NULL; item = item->next) {
 289     if (norm == GST_V4L2_TUNER_NORM (item->data)->index)
 290       return (GstTunerNorm *) item->data;
 291   }
 292
 293   return NULL;
 294 }
 295
 296 static void
 297 gst_v4l2_tuner_set_frequency (GstTuner        *mixer,
 298                               GstTunerChannel *channel,
 299                               gulong           frequency)
 300 {
 301   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 302   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 303   gint chan;
 304
 305   /* assert that we're opened and that we're using a known item */
 306   g_return_if_fail (GST_V4L2_IS_OPEN (v4l2element));
 307   g_return_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 308                         GST_TUNER_CHANNEL_FREQUENCY));
 309   g_return_if_fail (gst_v4l2_tuner_contains_channel (v4l2element, v4l2channel));
 310
 311   gst_v4l2_get_input (v4l2element, &chan);
 312   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 313       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 314     if (gst_v4l2_set_frequency (v4l2element, v4l2channel->tuner, frequency)) {
 315       gst_tuner_frequency_changed (mixer, channel, frequency);
 316       g_object_notify (G_OBJECT (v4l2element), "frequency");
 317     }
 318   }
 319 }
 320
 321 static gulong
 322 gst_v4l2_tuner_get_frequency (GstTuner        *mixer,
 323                               GstTunerChannel *channel)
 324 {
 325   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 326   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 327   gint chan;
 328   gulong frequency = 0;
 329
 330   /* assert that we're opened and that we're using a known item */
 331   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
 332   g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 333                                 GST_TUNER_CHANNEL_FREQUENCY), 0);
 334   g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
 335                                                          v4l2channel), 0);
 336
 337   gst_v4l2_get_input (v4l2element, &chan);
 338   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 339       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 340     gst_v4l2_get_frequency (v4l2element, v4l2channel->tuner, &frequency);
 341   }
 342
 343   return frequency;
 344 }
 345
 346 static gint
 347 gst_v4l2_tuner_signal_strength (GstTuner        *mixer,
 348                                 GstTunerChannel *channel)
 349 {
 350   GstV4l2Element *v4l2element = GST_V4L2ELEMENT (mixer);
 351   GstV4l2TunerChannel *v4l2channel = GST_V4L2_TUNER_CHANNEL (channel);
 352   gint chan;
 353   gulong signal = 0;
 354
 355   /* assert that we're opened and that we're using a known item */
 356   g_return_val_if_fail (GST_V4L2_IS_OPEN (v4l2element), 0);
 357   g_return_val_if_fail (GST_TUNER_CHANNEL_HAS_FLAG (channel,
 358                                 GST_TUNER_CHANNEL_FREQUENCY), 0);
 359   g_return_val_if_fail (gst_v4l2_tuner_contains_channel (v4l2element,
 360                                                          v4l2channel), 0);
 361
 362   gst_v4l2_get_input (v4l2element, &chan);
 363   if (chan == GST_V4L2_TUNER_CHANNEL (channel)->index &&
 364       GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) {
 365     gst_v4l2_signal_strength (v4l2element, v4l2channel->tuner, &signal);
 366   }
 367
 368   return signal;
 369 }