ffmpeg_base.h

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/*
 * Copyright (C) 2017-2026 Norbert Schlia (nschlia@oblivion-software.de)
 *
 * 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 St, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * On Debian systems, the complete text of the GNU General Public License
 * Version 3 can be found in `/usr/share/common-licenses/GPL-3'.
 */
 
#ifndef FFMPEG_BASE_H
#define FFMPEG_BASE_H
 
#pragma once
 
#include "ffmpeg_utils.h"
 
struct VIRTUALFILE;
struct AVCodecContext;
 
class FFmpeg_Base
{
public:
    explicit FFmpeg_Base();
    virtual ~FFmpeg_Base() = default;
 
protected:
    void                video_stream_setup(AVCodecContext *output_codec_ctx, AVStream* output_stream, AVCodecContext *input_codec_ctx, AVRational framerate, AVPixelFormat enc_hw_pix_fmt) const;
    int                 dict_set_with_check(AVDictionary **pm, const char *key, const char *value, int flags, const char *filename = nullptr, bool nodelete = false) const;
    int                 dict_set_with_check(AVDictionary **pm, const char *key, int64_t value, int flags, const char *filename = nullptr, bool nodelete = false) const;
    int                 opt_set_with_check(void *obj, const char *key, const char *value, int flags, const char *filename = nullptr) const;
    void                video_info(bool out_file, const AVFormatContext *format_ctx, const AVStream *stream) const;
    void                audio_info(bool out_file, const AVFormatContext *format_ctx, const AVStream *stream) const;
    void                subtitle_info(bool out_file, const AVFormatContext *format_ctx, const AVStream *stream) const;
    static std::string  get_pix_fmt_name(AVPixelFormat pix_fmt);
    static std::string  get_sample_fmt_name(AVSampleFormat sample_fmt);
#if LAVU_DEP_OLD_CHANNEL_LAYOUT
    static std::string get_channel_layout_name(const AVChannelLayout * ch_layout);
#else   // !LAVU_DEP_OLD_CHANNEL_LAYOUT
    static std::string  get_channel_layout_name(int nb_channels, uint64_t channel_layout);
#endif  // !LAVU_DEP_OLD_CHANNEL_LAYOUT
 
    virtual const char *filename() const = 0;
    virtual const char *destname() const = 0;
    virtual const char *virtname() const = 0;
    uint32_t            pts_to_frame(AVStream* stream, int64_t pts) const;
    int64_t              frame_to_pts(AVStream* stream, uint32_t frame_no) const;
    int                 get_channels(const AVCodecParameters *codecpar) const;
    void                set_channels(AVCodecParameters *codecpar_out, const AVCodecParameters *codecpar_in) const;
    int                 get_channels(const AVCodecContext *codec_ctx) const;
    void                set_channels(AVCodecContext *codec_ctx_out, const AVCodecContext *codec_ctx_in) const;
    void                set_channels(AVCodecContext *codec_ctx_out, int channels) const;
 
#define ASS_DEFAULT_PLAYRESX    384         
#define ASS_DEFAULT_PLAYRESY    288         
#define ASS_DEFAULT_FONT        "Arial"     
#define ASS_DEFAULT_FONT_SIZE   16          
#define ASS_DEFAULT_COLOUR      0xffffff
#define ASS_DEFAULT_BACK_COLOUR 0           
#define ASS_DEFAULT_BOLD        0           
#define ASS_DEFAULT_ITALIC      0           
#define ASS_DEFAULT_UNDERLINE   0           
#define ASS_DEFAULT_ALIGNMENT   2
#define ASS_DEFAULT_BORDERSTYLE 1
 
    int                 get_script_info(AVCodecContext *codec_ctx, int play_res_x, int play_res_y, const char *font, int font_size, int primary_color, int secondary_color, int outline_color, int back_color, int bold, int italic, int underline, int border_style, int alignment) const;
 
protected:
    VIRTUALFILE *       m_virtualfile;            
};
 
#endif // FFMPEG_BASE_H