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/*
* Various utilities for command line tools
* copyright (c) 2003 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#ifndef FFMPEG_CMDUTILS_H
#define FFMPEG_CMDUTILS_H

#include <stdint.h>

#include "libavcodec/avcodec.h"
#include "libavfilter/avfilter.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"

#ifdef __MINGW32__
#undef main /* We don't want SDL to override our main() */
#endif

/**
* program name, defined by the program for show_version().
*/
extern const char program_name[];

/**
* program birth year, defined by the program for show_banner()
*/
extern const int program_birth_year;

extern const char **opt_names;
extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
extern AVFormatContext *avformat_opts;
extern struct SwsContext *sws_opts;
extern AVDictionary *format_opts, *video_opts, *audio_opts, *sub_opts;

/**
* Initialize the cmdutils option system, in particular
* allocate the *_opts contexts.
*/
void init_opts(void);
/**
* Uninitialize the cmdutils option system, in particular
* free the *_opts contexts and their contents.
*/
void uninit_opts(void);

/**
* Trivial log callback.
* Only suitable for show_help and similar since it lacks prefix handling.
*/
void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);

/**
* Fallback for options that are not explicitly handled, these will be
* parsed through AVOptions.
*/
int opt_default(const char *opt, const char *arg);

/**
* Set the libav* libraries log level.
*/
int opt_loglevel(const char *opt, const char *arg);

/**
* Limit the execution time.
*/
int opt_timelimit(const char *opt, const char *arg);

/**
* Parse a string and return its corresponding value as a double.
* Exit from the application if the string cannot be correctly
* parsed or the corresponding value is invalid.
*
* @param context the context of the value to be set (e.g. the
* corresponding commandline option name)
* @param numstr the string to be parsed
* @param type the type (OPT_INT64 or OPT_FLOAT) as which the
* string should be parsed
* @param min the minimum valid accepted value
* @param max the maximum valid accepted value
*/
double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);

/**
* Parse a string specifying a time and return its corresponding
* value as a number of microseconds. Exit from the application if
* the string cannot be correctly parsed.
*
* @param context the context of the value to be set (e.g. the
* corresponding commandline option name)
* @param timestr the string to be parsed
* @param is_duration a flag which tells how to interpret timestr, if
* not zero timestr is interpreted as a duration, otherwise as a
* date
*
* @see parse_date()
*/
int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);

typedef struct {
    const char *name;
    int flags;
#define HAS_ARG 0x0001
#define OPT_BOOL 0x0002
#define OPT_EXPERT 0x0004
#define OPT_STRING 0x0008
#define OPT_VIDEO 0x0010
#define OPT_AUDIO 0x0020
#define OPT_GRAB 0x0040
#define OPT_INT 0x0080
#define OPT_FLOAT 0x0100
#define OPT_SUBTITLE 0x0200
#define OPT_INT64 0x0400
#define OPT_EXIT 0x0800
#define OPT_DATA 0x1000
     union {
        int *int_arg;
        char **str_arg;
        float *float_arg;
        int (*func_arg)(const char *, const char *);
        int64_t *int64_arg;
    } u;
    const char *help;
    const char *argname;
} OptionDef;

void show_help_options(const OptionDef *options, const char *msg, int mask, int value);

/**
* Parse the command line arguments.
* @param options Array with the definitions required to interpret every
* option of the form: -option_name [argument]
* @param parse_arg_function Name of the function called to process every
* argument without a leading option name flag. NULL if such arguments do
* not have to be processed.
*/
void parse_options(int argc, char **argv, const OptionDef *options,
                   int (* parse_arg_function)(const char *opt, const char *arg));

void set_context_opts(void *ctx, void *opts_ctx, int flags, AVCodec *codec);

/**
* Print an error message to stderr, indicating filename and a human
* readable description of the error code err.
*
* If strerror_r() is not available the use of this function in a
* multithreaded application may be unsafe.
*
* @see av_strerror()
*/
void print_error(const char *filename, int err);

/**
* Print the program banner to stderr. The banner contents depend on the
* current version of the repository and of the libav* libraries used by
* the program.
*/
void show_banner(void);

/**
* Print the version of the program to stdout. The version message
* depends on the current versions of the repository and of the libav*
* libraries.
*/
void show_version(void);

/**
* Print the license of the program to stdout. The license depends on
* the license of the libraries compiled into the program.
*/
void show_license(void);

/**
* Print a listing containing all the formats supported by the
* program.
*/
void show_formats(void);

/**
* Print a listing containing all the codecs supported by the
* program.
*/
void show_codecs(void);

/**
* Print a listing containing all the filters supported by the
* program.
*/
void show_filters(void);

/**
* Print a listing containing all the bit stream filters supported by the
* program.
*/
void show_bsfs(void);

/**
* Print a listing containing all the protocols supported by the
* program.
*/
void show_protocols(void);

/**
* Print a listing containing all the pixel formats supported by the
* program.
*/
void show_pix_fmts(void);

/**
* Return a positive value if a line read from standard input
* starts with [yY], otherwise return 0.
*/
int read_yesno(void);

/**
* Read the file with name filename, and put its content in a newly
* allocated 0-terminated buffer.
*
* @param bufptr location where pointer to buffer is returned
* @param size location where size of buffer is returned
* @return 0 in case of success, a negative value corresponding to an
* AVERROR error code in case of failure.
*/
int read_file(const char *filename, char **bufptr, size_t *size);

/**
* Get a file corresponding to a preset file.
*
* If is_path is non-zero, look for the file in the path preset_name.
* Otherwise search for a file named arg.ffpreset in the directories
* $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
* at configuration time or in a "ffpresets" folder along the executable
* on win32, in that order. If no such file is found and
* codec_name is defined, then search for a file named
* codec_name-preset_name.ffpreset in the above-mentioned directories.
*
* @param filename buffer where the name of the found filename is written
* @param filename_size size in bytes of the filename buffer
* @param preset_name name of the preset to search
* @param is_path tell if preset_name is a filename path
* @param codec_name name of the codec for which to look for the
* preset, may be NULL
*/
FILE *get_preset_file(char *filename, size_t filename_size,
                      const char *preset_name, int is_path, const char *codec_name);

#endif /* FFMPEG_CMDUTILS_H */
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