libav_utils.cpp 4.08 KB
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/*
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 *  Copyright (C) 2004-2017 Savoir-faire Linux Inc.
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 *
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 *  Author: Tristan Matthews <tristan.matthews@savoirfairelinux.com>
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 *  Author: Luca Barbato <lu_zero@gentoo.org>
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 *  Author: Guillaume Roguez <Guillaume.Roguez@savoirfairelinux.com>
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 *
 *  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
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 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
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 */

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#include "libav_deps.h" // MUST BE INCLUDED FIRST

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#include "config.h"
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#include "video/video_base.h"
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#include "logger.h"

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#include <vector>
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#include <algorithm>
#include <string>
#include <iostream>
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#include <thread>
#include <mutex>
#include <exception>
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#include <ciso646> // fix windows compiler bug
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namespace ring { namespace libav_utils {

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// protect libav/ffmpeg access
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static int
avcodecManageMutex(void **data, enum AVLockOp op)
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{
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    auto mutex = reinterpret_cast<std::mutex**>(data);
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    int ret = 0;
    switch (op) {
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        case AV_LOCK_CREATE:
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            try {
                *mutex = new std::mutex;
            } catch (const std::bad_alloc& e) {
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                return AVERROR(ENOMEM);
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            }
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            break;
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        case AV_LOCK_OBTAIN:
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            (*mutex)->lock();
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            break;
        case AV_LOCK_RELEASE:
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            (*mutex)->unlock();
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            break;
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        case AV_LOCK_DESTROY:
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            delete *mutex;
            *mutex = nullptr;
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            break;
        default:
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#ifdef AVERROR_BUG
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            return AVERROR_BUG;
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#else
            break;
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#endif
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    }
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    return AVERROR(ret);
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}

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static constexpr const char* AVLOGLEVEL = "AVLOGLEVEL";
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static void
setAvLogLevel()
{
    char* envvar = getenv(AVLOGLEVEL);
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    signed level = AV_LOG_WARNING;
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    if (envvar != nullptr) {
        if (not (std::istringstream(envvar) >> level))
            level = AV_LOG_ERROR;

        level = std::max(AV_LOG_QUIET, std::min(level, AV_LOG_DEBUG));
    }
    av_log_set_level(level);
}

static void
init_once()
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{
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    av_register_all();
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    avdevice_register_all();
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#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 13, 0)
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    avformat_network_init();
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#endif
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    av_lockmgr_register(avcodecManageMutex);
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    if (getDebugMode())
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        setAvLogLevel();
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}

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static std::once_flag already_called;
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void ring_avcodec_init()
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{
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    std::call_once(already_called, init_once);
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}

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int libav_pixel_format(int fmt)
{
    switch (fmt) {
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        case video::VIDEO_PIXFMT_BGRA: return PIXEL_FORMAT(BGRA);
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        case video::VIDEO_PIXFMT_RGBA: return PIXEL_FORMAT(RGBA);
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        case video::VIDEO_PIXFMT_YUYV422: return PIXEL_FORMAT(YUYV422);
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        case video::VIDEO_PIXFMT_YUV420P: return PIXEL_FORMAT(YUV420P);
        case video::VIDEO_PIXFMT_NV21: return PIXEL_FORMAT(NV21);
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    }
    return fmt;
}

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int ring_pixel_format(int fmt)
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{
    switch (fmt) {
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        case PIXEL_FORMAT(YUYV422): return video::VIDEO_PIXFMT_YUYV422;
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    }
    return fmt;
}

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void ring_url_split(const char *url,
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                   char *hostname, size_t hostname_size, int *port,
                   char *path, size_t path_size)
{
    av_url_split(NULL, 0, NULL, 0, hostname, hostname_size, port,
                 path, path_size, url);
}

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bool
is_yuv_planar(const AVPixFmtDescriptor& desc)
{
    if (not (desc.flags & AV_PIX_FMT_FLAG_PLANAR) or desc.flags & AV_PIX_FMT_FLAG_RGB)
        return false;

    /* handle formats that do not use all planes */
    unsigned used_bit_mask = (1u << desc.nb_components) - 1;
    for (unsigned i = 0; i < desc.nb_components; ++i)
        used_bit_mask &= ~(1u << desc.comp[i].plane);

    return not used_bit_mask;
}

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}} // namespace ring::libav_utils