daemon/cmd_start_studio.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2009, 2010 Nedko Arnaudov <nedko@arnaudov.name>
   6  *
   7  **************************************************************************
   8  * This file contains implementation of the "start studio" command
   9  **************************************************************************
  10  *
  11  * LADI Session Handler is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * LADI Session Handler is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
  23  * or write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include <unistd.h>
  28
  29 #include "cmd.h"
  30 #include "studio_internal.h"
  31 #include "loader.h"
  32 #include "../common/time.h"
  33 #include "../proxies/notify_proxy.h"
  34
  35 struct ladish_command_start_studio
  36 {
  37   struct ladish_command command;
  38   uint64_t deadline;
  39 };
  40
  41 static bool start_room(void * context, ladish_room_handle room)
  42 {
  43   return ladish_room_start(room, context);
  44 }
  45
  46 #define cmd_ptr ((struct ladish_command_start_studio *)context)
  47
  48 static bool run(void * context)
  49 {
  50   bool jack_server_started;
  51   unsigned int app_count;
  52
  53   switch (cmd_ptr->command.state)
  54   {
  55   case LADISH_COMMAND_STATE_PENDING:
  56     if (ladish_studio_is_started())
  57     {
  58       log_info("Ignoring start request because studio is already started.");
  59       /* nothing to do, studio is already running */
  60       cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
  61       return true;
  62     }
  63
  64     app_count = loader_get_app_count();
  65     if (app_count != 0)
  66     {
  67       log_error("Ignoring start request because there are apps running.");
  68       log_error("This could happen when JACK has crashed or when JACK stopped unexpectedly.");
  69       log_error("Save your work, then unload and reload the studio.");
  70       return false;
  71     }
  72
  73     log_info("Starting JACK server.");
  74
  75     ladish_graph_dump(g_studio.studio_graph);
  76
  77     if (!jack_proxy_start_server())
  78     {
  79       log_error("Starting JACK server failed.");
  80       ladish_notify_simple(
  81         LADISH_NOTIFY_URGENCY_HIGH,
  82         "JACK start failed",
  83         "You may want to inspect the <a href=\"http://ladish.org/wiki/diagnose_files\">JACK log file</a>\n\n"
  84         "Check if the sound device is connected.\n"
  85         "Check the JACK configuration.\n"
  86         "If your sound device does not support hardware mixing, check that it is not in use.\n"
  87         "If you have more than one sound device, check that their order is correct.");
  88       return false;
  89     }
  90
  91     cmd_ptr->deadline = ladish_get_current_microseconds();
  92     if (cmd_ptr->deadline != 0)
  93     {
  94       cmd_ptr->deadline += 5000000;
  95     }
  96
  97     cmd_ptr->command.state = LADISH_COMMAND_STATE_WAITING;
  98     /* fall through */
  99   case LADISH_COMMAND_STATE_WAITING:
 100     if (!ladish_environment_consume_change(&g_studio.env_store, ladish_environment_jack_server_started, &jack_server_started))
 101     {
 102       /* we are still waiting for the JACK server start */
 103       ASSERT(!ladish_environment_get(&g_studio.env_store, ladish_environment_jack_server_started)); /* someone else consumed the state change? */
 104
 105       if (cmd_ptr->deadline != 0 && ladish_get_current_microseconds() >= cmd_ptr->deadline)
 106       {
 107         log_error("Starting JACK server succeded, but 'started' signal was not received within 5 seconds.");
 108         cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
 109         return false;
 110       }
 111
 112       return true;
 113     }
 114
 115     log_info("Wait for JACK server start complete.");
 116
 117     ASSERT(jack_server_started);
 118
 119     ladish_studio_on_event_jack_started(); /* fetch configuration and announce start */
 120
 121     ladish_studio_iterate_rooms(ladish_studio_get_virtualizer(), start_room);
 122
 123     cmd_ptr->command.state = LADISH_COMMAND_STATE_DONE;
 124     return true;
 125   }
 126
 127   ASSERT_NO_PASS;
 128   return false;
 129 }
 130
 131 #undef cmd_ptr
 132
 133 bool ladish_command_start_studio(void * call_ptr, struct ladish_cqueue * queue_ptr)
 134 {
 135   struct ladish_command_start_studio * cmd_ptr;
 136
 137   cmd_ptr = ladish_command_new(sizeof(struct ladish_command_start_studio));
 138   if (cmd_ptr == NULL)
 139   {
 140     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_command_new() failed.");
 141     goto fail;
 142   }
 143
 144   cmd_ptr->command.run = run;
 145   cmd_ptr->deadline = 0;
 146
 147   if (!ladish_cqueue_add_command(queue_ptr, &cmd_ptr->command))
 148   {
 149     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_cqueue_add_command() failed.");
 150     goto fail_destroy_command;
 151   }
 152
 153   return true;
 154
 155 fail_destroy_command:
 156   free(cmd_ptr);
 157
 158 fail:
 159   return false;
 160 }