Skip to content
Snippets Groups Projects
Select Git revision
  • master default protected
  • release/202005
  • release/202001
  • release/201912
  • release/201911
  • release/releaseWindowsTestOne
  • release/windowsReleaseTest
  • release/releaseTest
  • release/releaseWindowsTest
  • release/201910
  • release/qt/201910
  • release/windows-test/201910
  • release/201908
  • release/201906
  • release/201905
  • release/201904
  • release/201903
  • release/201902
  • release/201901
  • release/201812
  • 4.0.0
  • 2.2.0
  • 2.1.0
  • 2.0.1
  • 2.0.0
  • 1.4.1
  • 1.4.0
  • 1.3.0
  • 1.2.0
  • 1.1.0
30 results

ring_types.h

Blame
    • Adrien Béraud's avatar
      2130f067
      sources: rename to jami · 2130f067
      Adrien Béraud authored
      * rename namespace from ring to jami
      * rename logs methods from RING_* to JAMI_*
      * rename RING_VIDEO to ENABLE_VIDEO
      
      Change-Id: Ic98498652d7059fafe58a96220d565bcdfa53658
      2130f067
      History
      sources: rename to jami
      Adrien Béraud authored
      * rename namespace from ring to jami
      * rename logs methods from RING_* to JAMI_*
      * rename RING_VIDEO to ENABLE_VIDEO
      
      Change-Id: Ic98498652d7059fafe58a96220d565bcdfa53658
    Code owners
    Assign users and groups as approvers for specific file changes. Learn more.
    ring_types.h 2.54 KiB
    /*
     *  Copyright (C) 2004-2019 Savoir-faire Linux Inc.
     *
     *  Author: Tristan Matthews <tristan.matthews@savoirfairelinux.com>
     *  Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
     *
     *  This program is free software; you can redistribute it and/or modify
     *  it under the terms of the GNU General Public License as published by
     *  the Free Software Foundation; either version 3 of the License, or
     *  (at your option) any later version.
     *
     *  This program is distributed in the hope that it will be useful,
     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *  GNU General Public License for more details.
     *
     *  You should have received a copy of the GNU General Public License
     *  along with this program; if not, write to the Free Software
     *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
     */
    
    #ifndef RING_TYPES_H_
    #define RING_TYPES_H_
    
    #include <type_traits>
    #include <memory>
    #include <mutex>
    #include <cstddef> // for size_t
    
    #include <ciso646> // fix windows compiler bug
    
    namespace jami {
    
    typedef int16_t AudioSample;
    
    static constexpr size_t SIZEBUF = 16000; /** About 62.5ms of buffering at 48kHz */
    
    /**
     * This meta-function is used to enable a template overload
     * only if given class T is a base of class U
     */
    template <class T, class U>
    using enable_if_base_of = typename std::enable_if<std::is_base_of<T, U>::value, T>::type;
    
    /**
     * Return a shared pointer on an auto-generated global instance of class T.
     * This instance is created only at usage and destroyed when not,
     * as we keep only a weak reference on it.
     * But when created it's always the same object until all holders release
     * their sharing.
     * An optional MaxRespawn positive integer can be given to limit the number
     * of time the object can be created (i.e. different instance).
     * Any negative values (default) block this effect (unlimited respawn).
     * This function is thread-safe.
     */
    template <class T, signed MaxRespawn=-1>
    std::shared_ptr<T>
    getGlobalInstance()
    {
        static std::recursive_mutex mutex; // recursive as instance calls recursively
        static std::weak_ptr<T> wlink;
    
        std::unique_lock<std::recursive_mutex> lock(mutex);
    
        if (wlink.expired()) {
            static signed counter {MaxRespawn};
            if (not counter)
                return nullptr;
            auto link = std::make_shared<T>();
            wlink = link;
            if (counter > 0)
                --counter;
            return link;
        }
    
        return wlink.lock();
    }
    
    } // namespace jami
    
    #endif // RING_TYPES_H_