modules/access/v4l2/radio.c

   1 /*****************************************************************************
   2  * radio.c : V4L2 analog radio receiver
   3  *****************************************************************************
   4  * Copyright (C) 2012 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <fcntl.h>
  26
  27 #include <vlc_common.h>
  28 #include <vlc_demux.h>
  29 #include <vlc_fs.h>
  30
  31 #include "v4l2.h"
  32
  33 typedef struct
  34 {
  35     int fd;
  36     vlc_v4l2_ctrl_t *controls;
  37     mtime_t start;
  38 } demux_sys_t;
  39
  40 static int RadioControl (demux_t *demux, int query, va_list args)
  41 {
  42     demux_sys_t *sys = demux->p_sys;
  43
  44     switch (query)
  45     {
  46         case DEMUX_CAN_PAUSE:
  47         case DEMUX_CAN_SEEK:
  48         case DEMUX_CAN_CONTROL_PACE:
  49             *va_arg (args, bool *) = false;
  50             break;
  51
  52         case DEMUX_GET_PTS_DELAY:
  53             *va_arg (args,int64_t *) = INT64_C(1000)
  54                 * var_InheritInteger (demux, "live-caching");
  55             break;
  56
  57         case DEMUX_GET_TIME:
  58             *va_arg (args, int64_t *) = mdate () - sys->start;
  59             break;
  60
  61         /* TODO implement others */
  62         default:
  63             return VLC_EGENERIC;
  64     }
  65     return VLC_SUCCESS;
  66 }
  67
  68 int RadioOpen (vlc_object_t *obj)
  69 {
  70     demux_t *demux = (demux_t *)obj;
  71     if (demux->out == NULL)
  72         return VLC_EGENERIC;
  73
  74     /* Parse MRL */
  75     size_t pathlen = strcspn (demux->psz_location, ":;");
  76     char *path = (pathlen != 0) ? strndup (demux->psz_location, pathlen)
  77                               : var_InheritString (obj, CFG_PREFIX"radio-dev");
  78     if (unlikely(path == NULL))
  79         return VLC_ENOMEM;
  80     if (demux->psz_location[pathlen] != '\0')
  81         var_LocationParse (obj, demux->psz_location + pathlen + 1, CFG_PREFIX);
  82
  83     /* Open device */
  84     uint32_t caps;
  85     int fd = OpenDevice (obj, path, &caps);
  86     free (path);
  87     if (fd == -1)
  88         return VLC_EGENERIC;
  89     if (!(caps & V4L2_CAP_TUNER))
  90     {
  91         msg_Err (obj, "not a radio tuner device");
  92         goto error;
  93     }
  94
  95     if (SetupTuner (obj, fd, 0))
  96         goto error;
  97
  98     demux_sys_t *sys = malloc (sizeof (*sys));
  99     if (unlikely(sys == NULL))
 100         goto error;
 101
 102     sys->fd = fd;
 103     sys->controls = ControlsInit (VLC_OBJECT(demux), fd);
 104     sys->start = mdate ();
 105
 106     demux->p_sys = sys;
 107     demux->pf_demux = NULL;
 108     demux->pf_control = RadioControl;
 109     return VLC_SUCCESS;
 110
 111 error:
 112     v4l2_close (fd);
 113     return VLC_EGENERIC;
 114 }
 115
 116 void RadioClose (vlc_object_t *obj)
 117 {
 118     demux_t *demux = (demux_t *)obj;
 119     demux_sys_t *sys = demux->p_sys;
 120
 121     ControlsDeinit (obj, sys->controls);
 122     v4l2_close (sys->fd);
 123     free (sys);
 124 }