cmdutils.h

   1 /*
   2  * Various utilities for command line tools
   3  * copyright (c) 2003 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef FFMPEG_CMDUTILS_H
  23 #define FFMPEG_CMDUTILS_H
  24
  25 #include <inttypes.h>
  26
  27 /**
  28  * Parses a string and returns its corresponding value as a double.
  29  * Exits from the application if the string cannot be correctly
  30  * parsed or the corresponding value is invalid.
  31  *
  32  * @param context the context of the value to be set (e.g. the
  33  * corresponding commandline option name)
  34  * @param numstr the string to be parsed
  35  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
  36  * string should be parsed
  37  * @param min the minimum valid accepted value
  38  * @param max the maximum valid accepted value
  39  */
  40 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
  41
  42 /**
  43  * Parses a string specifying a time and returns its corresponding
  44  * value as a number of microseconds. Exits from the application if
  45  * the string cannot be correctly parsed.
  46  *
  47  * @param context the context of the value to be set (e.g. the
  48  * corresponding commandline option name)
  49  * @param timestr the string to be parsed
  50  * @param is_duration a flag which tells how to interpret \p timestr, if
  51  * not zero \p timestr is interpreted as a duration, otherwise as a
  52  * date
  53  *
  54  * @see parse_date()
  55  */
  56 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
  57
  58 typedef struct {
  59     const char *name;
  60     int flags;
  61 #define HAS_ARG    0x0001
  62 #define OPT_BOOL   0x0002
  63 #define OPT_EXPERT 0x0004
  64 #define OPT_STRING 0x0008
  65 #define OPT_VIDEO  0x0010
  66 #define OPT_AUDIO  0x0020
  67 #define OPT_GRAB   0x0040
  68 #define OPT_INT    0x0080
  69 #define OPT_FLOAT  0x0100
  70 #define OPT_SUBTITLE 0x0200
  71 #define OPT_FUNC2  0x0400
  72 #define OPT_INT64  0x0800
  73      union {
  74         void (*func_arg)(const char *); //FIXME passing error code as int return would be nicer then exit() in the func
  75         int *int_arg;
  76         char **str_arg;
  77         float *float_arg;
  78         int (*func2_arg)(const char *, const char *);
  79         int64_t *int64_arg;
  80     } u;
  81     const char *help;
  82     const char *argname;
  83 } OptionDef;
  84
  85 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
  86
  87 /**
  88  * Parses the command line arguments.
  89  * @param options Array with the definitions required to interpret every
  90  * option of the form: -<option_name> [<argument>]
  91  * @param parse_arg_function Name of the function called to process every
  92  * argument without a leading option name flag. NULL if such arguments do
  93  * not have to be processed.
  94  */
  95 void parse_options(int argc, char **argv, const OptionDef *options,
  96                    void (* parse_arg_function)(const char*));
  97
  98 void print_error(const char *filename, int err);
  99
 100 /**
 101  * Prints the program banner to stderr. The banner contents depend on the
 102  * current version of the repository and of the libav* libraries used by
 103  * the program.
 104  * @param program_name name of the program
 105  * @param program_birth_year year of birth of the program
 106  */
 107 void show_banner(const char *program_name, int program_birth_year);
 108
 109 /**
 110  * Prints the version of the program to stdout. The version message
 111  * depends on the current versions of the repository and of the libav*
 112  * libraries.
 113  * @param program_name name of the program
 114  */
 115 void show_version(const char *program_name);
 116
 117 /**
 118  * Prints the license of the program to stdout. The license depends on
 119  * the license of the libraries compiled into the program.
 120  */
 121 void show_license(void);
 122
 123 #endif /* FFMPEG_CMDUTILS_H */