daemon/cmd_start_studio.c

   1 /* -*- Mode: C ; c-basic-offset: 2 -*- */
   2 /*
   3  * LADI Session Handler (ladish)
   4  *
   5  * Copyright (C) 2009 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 "cmd.h"
  28 #include "studio_internal.h"
  29
  30 #define cmd_ptr ((struct ladish_command *)context)
  31
  32 static bool run(void * context)
  33 {
  34   bool jack_server_started;
  35
  36   switch (cmd_ptr->state)
  37   {
  38   case LADISH_COMMAND_STATE_PENDING:
  39     if (studio_is_started())
  40     {
  41       log_info("Ignoring start request because studio is already started.");
  42       /* nothing to do, studio is already running */
  43       cmd_ptr->state = LADISH_COMMAND_STATE_DONE;
  44       return true;
  45     }
  46
  47     log_info("Starting JACK server.");
  48
  49     ladish_graph_dump(g_studio.studio_graph);
  50
  51     if (!jack_proxy_start_server())
  52     {
  53       log_error("Starting JACK server failed.");
  54       return false;
  55     }
  56
  57     cmd_ptr->state = LADISH_COMMAND_STATE_WAITING;
  58     /* fall through */
  59   case LADISH_COMMAND_STATE_WAITING:
  60     if (!ladish_environment_consume_change(&g_studio.env_store, ladish_environment_jack_server_started, &jack_server_started))
  61     {
  62       /* we are still waiting for the JACK server start */
  63       ASSERT(!ladish_environment_get(&g_studio.env_store, ladish_environment_jack_server_started)); /* someone else consumed the state change? */
  64       return true;
  65     }
  66
  67     log_info("Wait for JACK server start complete.");
  68
  69     ASSERT(jack_server_started);
  70
  71     on_event_jack_started();    /* fetch configuration and announce start */
  72
  73     cmd_ptr->state = LADISH_COMMAND_STATE_DONE;
  74     return true;
  75   }
  76
  77   ASSERT_NO_PASS;
  78   return false;
  79 }
  80
  81 #undef cmd_ptr
  82
  83 bool ladish_command_start_studio(void * call_ptr, struct ladish_cqueue * queue_ptr)
  84 {
  85   struct ladish_command * cmd_ptr;
  86
  87   cmd_ptr = ladish_command_new(sizeof(struct ladish_command));
  88   if (cmd_ptr == NULL)
  89   {
  90     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_command_new() failed.");
  91     goto fail;
  92   }
  93
  94   cmd_ptr->run = run;
  95
  96   if (!ladish_cqueue_add_command(queue_ptr, cmd_ptr))
  97   {
  98     lash_dbus_error(call_ptr, LASH_DBUS_ERROR_GENERIC, "ladish_cqueue_add_command() failed.");
  99     goto fail_destroy_command;
 100   }
 101
 102   return true;
 103
 104 fail_destroy_command:
 105   free(cmd_ptr);
 106
 107 fail:
 108   return false;
 109 }