src/Audio/SLES/Init.cpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #include "Init.hpp"
  25
  26 #include <assert.h>
  27 #include <stddef.h>
  28 #include <dlfcn.h>
  29
  30 typedef SLresult (*T_slCreateEngine)(SLObjectItf *pEngine,
  31                                      SLuint32 numOptions,
  32                                      const SLEngineOption *pEngineOptions,
  33                                      SLuint32 numInterfaces,
  34                                      const SLInterfaceID *pInterfaceIds,
  35                                      const SLboolean *pInterfaceRequired);
  36
  37 static T_slCreateEngine _slCreateEngine;
  38
  39 namespace SLES {
  40   const SLInterfaceID *IID_ENGINE, *IID_PLAY,
  41     *IID_ANDROIDSIMPLEBUFFERQUEUE;
  42 }
  43
  44 bool
  45 SLES::Initialise()
  46 {
  47   void *sles = dlopen("libOpenSLES.so", RTLD_NOW);
  48   if (sles == NULL)
  49     return false;
  50
  51   IID_ENGINE = (const SLInterfaceID *)dlsym(sles, "SL_IID_ENGINE");
  52   IID_PLAY = (const SLInterfaceID *)dlsym(sles, "SL_IID_PLAY");
  53   IID_ANDROIDSIMPLEBUFFERQUEUE = (const SLInterfaceID *)
  54     dlsym(sles, "SL_IID_ANDROIDSIMPLEBUFFERQUEUE");
  55   if (IID_ENGINE == NULL || IID_PLAY == NULL ||
  56       IID_ANDROIDSIMPLEBUFFERQUEUE == NULL)
  57     return false;
  58
  59   _slCreateEngine = (T_slCreateEngine)dlsym(sles, "slCreateEngine");
  60   if (_slCreateEngine == NULL)
  61     return false;
  62
  63   return true;
  64 }
  65
  66 SLresult
  67 SLES::CreateEngine(SLObjectItf *pEngine, SLuint32 numOptions,
  68                    const SLEngineOption *pEngineOptions,
  69                    SLuint32 numInterfaces, const SLInterfaceID *pInterfaceIds,
  70                    const SLboolean *pInterfaceRequired)
  71 {
  72   if (_slCreateEngine == NULL)
  73     /* Initialise() has failed, bail out */
  74     return SL_RESULT_FEATURE_UNSUPPORTED;
  75
  76   return _slCreateEngine(pEngine, numOptions, pEngineOptions,
  77                          numInterfaces, pInterfaceIds, pInterfaceRequired);
  78 }