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  * program name, defined by the program for show_version().
  29  */
  30 extern const char program_name[];
  31
  32 /**
  33  * program birth year, defined by the program for show_banner()
  34  */
  35 extern const int program_birth_year;
  36
  37 extern const char **opt_names;
  38 extern AVCodecContext *avctx_opts[CODEC_TYPE_NB];
  39 extern AVFormatContext *avformat_opts;
  40 extern struct SwsContext *sws_opts;
  41
  42 /**
  43  * Fallback for options that are not explixitly handled, these will be
  44  * parsed through AVOptions.
  45  */
  46 int opt_default(const char *opt, const char *arg);
  47
  48 /**
  49  * Parses a string and returns its corresponding value as a double.
  50  * Exits from the application if the string cannot be correctly
  51  * parsed or the corresponding value is invalid.
  52  *
  53  * @param context the context of the value to be set (e.g. the
  54  * corresponding commandline option name)
  55  * @param numstr the string to be parsed
  56  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
  57  * string should be parsed
  58  * @param min the minimum valid accepted value
  59  * @param max the maximum valid accepted value
  60  */
  61 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
  62
  63 /**
  64  * Parses a string specifying a time and returns its corresponding
  65  * value as a number of microseconds. Exits from the application if
  66  * the string cannot be correctly parsed.
  67  *
  68  * @param context the context of the value to be set (e.g. the
  69  * corresponding commandline option name)
  70  * @param timestr the string to be parsed
  71  * @param is_duration a flag which tells how to interpret \p timestr, if
  72  * not zero \p timestr is interpreted as a duration, otherwise as a
  73  * date
  74  *
  75  * @see parse_date()
  76  */
  77 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
  78
  79 typedef struct {
  80     const char *name;
  81     int flags;
  82 #define HAS_ARG    0x0001
  83 #define OPT_BOOL   0x0002
  84 #define OPT_EXPERT 0x0004
  85 #define OPT_STRING 0x0008
  86 #define OPT_VIDEO  0x0010
  87 #define OPT_AUDIO  0x0020
  88 #define OPT_GRAB   0x0040
  89 #define OPT_INT    0x0080
  90 #define OPT_FLOAT  0x0100
  91 #define OPT_SUBTITLE 0x0200
  92 #define OPT_FUNC2  0x0400
  93 #define OPT_INT64  0x0800
  94 #define OPT_EXIT   0x1000
  95      union {
  96         void (*func_arg)(const char *); //FIXME passing error code as int return would be nicer then exit() in the func
  97         int *int_arg;
  98         char **str_arg;
  99         float *float_arg;
 100         int (*func2_arg)(const char *, const char *);
 101         int64_t *int64_arg;
 102     } u;
 103     const char *help;
 104     const char *argname;
 105 } OptionDef;
 106
 107 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
 108
 109 /**
 110  * Parses the command line arguments.
 111  * @param options Array with the definitions required to interpret every
 112  * option of the form: -<option_name> [<argument>]
 113  * @param parse_arg_function Name of the function called to process every
 114  * argument without a leading option name flag. NULL if such arguments do
 115  * not have to be processed.
 116  */
 117 void parse_options(int argc, char **argv, const OptionDef *options,
 118                    void (* parse_arg_function)(const char*));
 119
 120 void set_context_opts(void *ctx, void *opts_ctx, int flags);
 121
 122 void print_error(const char *filename, int err);
 123
 124 /**
 125  * Prints the program banner to stderr. The banner contents depend on the
 126  * current version of the repository and of the libav* libraries used by
 127  * the program.
 128  */
 129 void show_banner(void);
 130
 131 /**
 132  * Prints the version of the program to stdout. The version message
 133  * depends on the current versions of the repository and of the libav*
 134  * libraries.
 135  */
 136 void show_version(void);
 137
 138 /**
 139  * Prints the license of the program to stdout. The license depends on
 140  * the license of the libraries compiled into the program.
 141  */
 142 void show_license(void);
 143
 144 /**
 145  * Prints a listing containing all the formats supported by the
 146  * program.
 147  */
 148 void show_formats(void);
 149
 150 #endif /* FFMPEG_CMDUTILS_H */