release/src/router/ffmpeg/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[AVMEDIA_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  * Limit the execution time.
  60  */
  61 int opt_timelimit(const char *opt, const char *arg);
  62
  63 /**
  64  * Parses a string and returns its corresponding value as a double.
  65  * Exits from the application if the string cannot be correctly
  66  * parsed or the corresponding value is invalid.
  67  *
  68  * @param context the context of the value to be set (e.g. the
  69  * corresponding commandline option name)
  70  * @param numstr the string to be parsed
  71  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
  72  * string should be parsed
  73  * @param min the minimum valid accepted value
  74  * @param max the maximum valid accepted value
  75  */
  76 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
  77
  78 /**
  79  * Parses a string specifying a time and returns its corresponding
  80  * value as a number of microseconds. Exits from the application if
  81  * the string cannot be correctly parsed.
  82  *
  83  * @param context the context of the value to be set (e.g. the
  84  * corresponding commandline option name)
  85  * @param timestr the string to be parsed
  86  * @param is_duration a flag which tells how to interpret timestr, if
  87  * not zero timestr is interpreted as a duration, otherwise as a
  88  * date
  89  *
  90  * @see parse_date()
  91  */
  92 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
  93
  94 typedef struct {
  95     const char *name;
  96     int flags;
  97 #define HAS_ARG    0x0001
  98 #define OPT_BOOL   0x0002
  99 #define OPT_EXPERT 0x0004
 100 #define OPT_STRING 0x0008
 101 #define OPT_VIDEO  0x0010
 102 #define OPT_AUDIO  0x0020
 103 #define OPT_GRAB   0x0040
 104 #define OPT_INT    0x0080
 105 #define OPT_FLOAT  0x0100
 106 #define OPT_SUBTITLE 0x0200
 107 #define OPT_FUNC2  0x0400
 108 #define OPT_INT64  0x0800
 109 #define OPT_EXIT   0x1000
 110      union {
 111         void (*func_arg)(const char *); //FIXME passing error code as int return would be nicer then exit() in the func
 112         int *int_arg;
 113         char **str_arg;
 114         float *float_arg;
 115         int (*func2_arg)(const char *, const char *);
 116         int64_t *int64_arg;
 117     } u;
 118     const char *help;
 119     const char *argname;
 120 } OptionDef;
 121
 122 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
 123
 124 /**
 125  * Parses the command line arguments.
 126  * @param options Array with the definitions required to interpret every
 127  * option of the form: -<option_name> [<argument>]
 128  * @param parse_arg_function Name of the function called to process every
 129  * argument without a leading option name flag. NULL if such arguments do
 130  * not have to be processed.
 131  */
 132 void parse_options(int argc, char **argv, const OptionDef *options,
 133                    void (* parse_arg_function)(const char*));
 134
 135 void set_context_opts(void *ctx, void *opts_ctx, int flags);
 136
 137 /**
 138  * Prints an error message to stderr, indicating filename and a human
 139  * readable description of the error code err.
 140  *
 141  * If strerror_r() is not available the use of this function in a
 142  * multithreaded application may be unsafe.
 143  *
 144  * @see av_strerror()
 145  */
 146 void print_error(const char *filename, int err);
 147
 148 void list_fmts(void (*get_fmt_string)(char *buf, int buf_size, int fmt), int nb_fmts);
 149
 150 /**
 151  * Prints the program banner to stderr. The banner contents depend on the
 152  * current version of the repository and of the libav* libraries used by
 153  * the program.
 154  */
 155 void show_banner(void);
 156
 157 /**
 158  * Prints the version of the program to stdout. The version message
 159  * depends on the current versions of the repository and of the libav*
 160  * libraries.
 161  */
 162 void show_version(void);
 163
 164 /**
 165  * Prints the license of the program to stdout. The license depends on
 166  * the license of the libraries compiled into the program.
 167  */
 168 void show_license(void);
 169
 170 /**
 171  * Prints a listing containing all the formats supported by the
 172  * program.
 173  */
 174 void show_formats(void);
 175
 176 /**
 177  * Prints a listing containing all the codecs supported by the
 178  * program.
 179  */
 180 void show_codecs(void);
 181
 182 /**
 183  * Prints a listing containing all the filters supported by the
 184  * program.
 185  */
 186 void show_filters(void);
 187
 188 /**
 189  * Prints a listing containing all the bit stream filters supported by the
 190  * program.
 191  */
 192 void show_bsfs(void);
 193
 194 /**
 195  * Prints a listing containing all the protocols supported by the
 196  * program.
 197  */
 198 void show_protocols(void);
 199
 200 /**
 201  * Prints a listing containing all the pixel formats supported by the
 202  * program.
 203  */
 204 void show_pix_fmts(void);
 205
 206 /**
 207  * Returns a positive value if reads from standard input a line
 208  * starting with [yY], otherwise returns 0.
 209  */
 210 int read_yesno(void);
 211
 212 /**
 213  * Reads the file with name filename, and puts its content in a newly
 214  * allocated 0-terminated buffer.
 215  *
 216  * @param bufptr puts here the pointer to the newly allocated buffer
 217  * @param size puts here the size of the newly allocated buffer
 218  * @return 0 in case of success, a negative value corresponding to an
 219  * AVERROR error code in case of failure.
 220  */
 221 int read_file(const char *filename, char **bufptr, size_t *size);
 222
 223 #endif /* FFMPEG_CMDUTILS_H */