convert.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte-Multimedia.
 *
 * StormByte-Multimedia original source is dual-licensed:
 *
 * 1. GNU Lesser General Public License v3.0 (or later)
 *    You may redistribute and/or modify this file under the terms of the
 *    GNU Lesser General Public License as published by the Free Software
 *    Foundation, either version 3 of the License, or (at your option)
 *    any later version.
 *
 * 2. Commercial license
 *    Alternatively, this file may be used under the terms of a commercial
 *    license agreement with the copyright holder
 *    (David C. Manuelda <StormByte@gmail.com>).
 *
 * Both licenses apply only to original StormByte-Multimedia source in this
 * file. Third-party components — including FFmpeg and embedded trained data —
 * remain under their own licenses and are not covered by the commercial grant.
 *
 * Neither license grants any patent rights. Any patent licenses required
 * to use this software or third-party components must be obtained separately
 * from the patent holders.
 *
 * StormByte-Multimedia 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with StormByte-Multimedia. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-StormByte-Commercial
 */
 
#pragma once
 
#include <StormByte/multimedia/ffmpeg/AVChannelLayout.hxx>
#include <StormByte/multimedia/ffmpeg/AVRational.hxx>
 
extern "C" {
    #include <libavutil/channel_layout.h>
    #include <libavutil/mem.h>
    #include <libavutil/rational.h>
}
 
namespace StormByte::Multimedia::FFmpeg {
    struct Convert {
        static const ::AVChannelLayout* Raw(const AVChannelLayout& layout) noexcept {
            return layout.m_raw;
        }
 
        static ::AVChannelLayout* Raw(AVChannelLayout& layout) noexcept {
            return layout.m_raw;
        }
 
        static AVChannelLayout From(const ::AVChannelLayout& src) noexcept {
            AVChannelLayout out;
            out.Ensure();
            if (!out.m_raw)
                return out;
            if (av_channel_layout_copy(out.m_raw, &src) < 0)
                out.Free();
            return out;
        }
    };
 
    inline ::AVRational ToRaw(const AVRational& rational) noexcept {
        return { rational.num, rational.den };
    }
 
    inline AVRational FromRaw(::AVRational rational) noexcept {
        return AVRational(rational.num, rational.den);
    }
 
    inline const ::AVChannelLayout* ToRaw(const AVChannelLayout& layout) noexcept {
        return Convert::Raw(layout);
    }
 
    inline ::AVChannelLayout* ToRaw(AVChannelLayout& layout) noexcept {
        return Convert::Raw(layout);
    }
 
    inline AVChannelLayout FromRaw(const ::AVChannelLayout& layout) noexcept {
        return Convert::From(layout);
    }
 
    inline AVChannelLayout FromRaw(const ::AVChannelLayout* layout) noexcept {
        return layout ? Convert::From(*layout) : AVChannelLayout{};
    }
}