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 #include "libavcodec/avcodec.h"
  27 #include "libavformat/avformat.h"
  28 #include "libswscale/swscale.h"
  29
  30 /**
  31  * program name, defined by the program for show_version().
  32  */
  33 extern const char program_name[];
  34
  35 /**
  36  * program birth year, defined by the program for show_banner()
  37  */
  38 extern const int program_birth_year;
  39
  40 extern const int this_year;
  41
  42 extern const char **opt_names;
  43 extern AVCodecContext *avcodec_opts[CODEC_TYPE_NB];
  44 extern AVFormatContext *avformat_opts;
  45 extern struct SwsContext *sws_opts;
  46
  47 /**
  48  * Fallback for options that are not explicitly handled, these will be
  49  * parsed through AVOptions.
  50  */
  51 int opt_default(const char *opt, const char *arg);
  52
  53 /**
  54  * Sets the libav* libraries log level.
  55  */
  56 int opt_loglevel(const char *opt, const char *arg);
  57
  58 /**
  59  * Parses a string and returns its corresponding value as a double.
  60  * Exits from the application if the string cannot be correctly
  61  * parsed or the corresponding value is invalid.
  62  *
  63  * @param context the context of the value to be set (e.g. the
  64  * corresponding commandline option name)
  65  * @param numstr the string to be parsed
  66  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
  67  * string should be parsed
  68  * @param min the minimum valid accepted value
  69  * @param max the maximum valid accepted value
  70  */
  71 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
  72
  73 /**
  74  * Parses a string specifying a time and returns its corresponding
  75  * value as a number of microseconds. Exits from the application if
  76  * the string cannot be correctly parsed.
  77  *
  78  * @param context the context of the value to be set (e.g. the
  79  * corresponding commandline option name)
  80  * @param timestr the string to be parsed
  81  * @param is_duration a flag which tells how to interpret timestr, if
  82  * not zero timestr is interpreted as a duration, otherwise as a
  83  * date
  84  *
  85  * @see parse_date()
  86  */
  87 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
  88
  89 typedef struct {
  90     const char *name;
  91     int flags;
  92 #define HAS_ARG    0x0001
  93 #define OPT_BOOL   0x0002
  94 #define OPT_EXPERT 0x0004
  95 #define OPT_STRING 0x0008
  96 #define OPT_VIDEO  0x0010
  97 #define OPT_AUDIO  0x0020
  98 #define OPT_GRAB   0x0040
  99 #define OPT_INT    0x0080
 100 #define OPT_FLOAT  0x0100
 101 #define OPT_SUBTITLE 0x0200
 102 #define OPT_FUNC2  0x0400
 103 #define OPT_INT64  0x0800
 104 #define OPT_EXIT   0x1000
 105      union {
 106         void (*func_arg)(const char *); //FIXME passing error code as int return would be nicer then exit() in the func
 107         int *int_arg;
 108         char **str_arg;
 109         float *float_arg;
 110         int (*func2_arg)(const char *, const char *);
 111         int64_t *int64_arg;
 112     } u;
 113     const char *help;
 114     const char *argname;
 115 } OptionDef;
 116
 117 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
 118
 119 /**
 120  * Parses the command line arguments.
 121  * @param options Array with the definitions required to interpret every
 122  * option of the form: -<option_name> [<argument>]
 123  * @param parse_arg_function Name of the function called to process every
 124  * argument without a leading option name flag. NULL if such arguments do
 125  * not have to be processed.
 126  */
 127 void parse_options(int argc, char **argv, const OptionDef *options,
 128                    void (* parse_arg_function)(const char*));
 129
 130 void set_context_opts(void *ctx, void *opts_ctx, int flags);
 131
 132 void print_error(const char *filename, int err);
 133
 134 /**
 135  * Prints the program banner to stderr. The banner contents depend on the
 136  * current version of the repository and of the libav* libraries used by
 137  * the program.
 138  */
 139 void show_banner(void);
 140
 141 /**
 142  * Prints the version of the program to stdout. The version message
 143  * depends on the current versions of the repository and of the libav*
 144  * libraries.
 145  */
 146 void show_version(void);
 147
 148 /**
 149  * Prints the license of the program to stdout. The license depends on
 150  * the license of the libraries compiled into the program.
 151  */
 152 void show_license(void);
 153
 154 /**
 155  * Prints a listing containing all the formats supported by the
 156  * program.
 157  */
 158 void show_formats(void);
 159
 160 /**
 161  * Returns a positive value if reads from standard input a line
 162  * starting with [yY], otherwise returns 0.
 163  */
 164 int read_yesno(void);
 165
 166 #endif /* FFMPEG_CMDUTILS_H */