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libav_utils.cpp

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    libav_utils.cpp 4.08 KiB
    /*
     *  Copyright (C) 2004-2017 Savoir-faire Linux Inc.
     *
     *  Author: Tristan Matthews <tristan.matthews@savoirfairelinux.com>
     *  Author: Luca Barbato <lu_zero@gentoo.org>
     *  Author: Guillaume Roguez <Guillaume.Roguez@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.
     */
    
    #include "libav_deps.h" // MUST BE INCLUDED FIRST
    
    #include "config.h"
    #include "video/video_base.h"
    #include "logger.h"
    
    #include <vector>
    #include <algorithm>
    #include <string>
    #include <iostream>
    #include <thread>
    #include <mutex>
    #include <exception>
    #include <ciso646> // fix windows compiler bug
    
    namespace ring { namespace libav_utils {
    
    // protect libav/ffmpeg access
    static int
    avcodecManageMutex(void **data, enum AVLockOp op)
    {
        auto mutex = reinterpret_cast<std::mutex**>(data);
        int ret = 0;
        switch (op) {
            case AV_LOCK_CREATE:
                try {
                    *mutex = new std::mutex;
                } catch (const std::bad_alloc& e) {
                    return AVERROR(ENOMEM);
                }
                break;
            case AV_LOCK_OBTAIN:
                (*mutex)->lock();
                break;
            case AV_LOCK_RELEASE:
                (*mutex)->unlock();
                break;
            case AV_LOCK_DESTROY:
                delete *mutex;
                *mutex = nullptr;
                break;
            default:
    #ifdef AVERROR_BUG
                return AVERROR_BUG;
    #else
                break;
    #endif
        }