2 * Various utilities for command line tools
3 * copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef FFMPEG_CMDUTILS_H
23 #define FFMPEG_CMDUTILS_H
27 #include "libavcodec/avcodec.h"
28 #include "libavfilter/avfilter.h"
29 #include "libavformat/avformat.h"
30 #include "libswscale/swscale.h"
33 #undef main /* We don't want SDL to override our main() */
37 * program name, defined by the program for show_version().
39 extern const char program_name[];
42 * program birth year, defined by the program for show_banner()
44 extern const int program_birth_year;
46 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
47 extern AVFormatContext *avformat_opts;
48 extern struct SwsContext *sws_opts;
49 extern AVDictionary *format_opts, *codec_opts;
52 * Initialize the cmdutils option system, in particular
53 * allocate the *_opts contexts.
57 * Uninitialize the cmdutils option system, in particular
58 * free the *_opts contexts and their contents.
60 void uninit_opts(void);
63 * Trivial log callback.
64 * Only suitable for opt_help and similar since it lacks prefix handling.
66 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
69 * Fallback for options that are not explicitly handled, these will be
70 * parsed through AVOptions.
72 int opt_default(const char *opt, const char *arg);
75 * Set the libav* libraries log level.
77 int opt_loglevel(const char *opt, const char *arg);
79 int opt_codec_debug(const char *opt, const char *arg);
82 * Limit the execution time.
84 int opt_timelimit(const char *opt, const char *arg);
87 * Parse a string and return its corresponding value as a double.
88 * Exit from the application if the string cannot be correctly
89 * parsed or the corresponding value is invalid.
91 * @param context the context of the value to be set (e.g. the
92 * corresponding commandline option name)
93 * @param numstr the string to be parsed
94 * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
95 * string should be parsed
96 * @param min the minimum valid accepted value
97 * @param max the maximum valid accepted value
99 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
102 * Parse a string specifying a time and return its corresponding
103 * value as a number of microseconds. Exit from the application if
104 * the string cannot be correctly parsed.
106 * @param context the context of the value to be set (e.g. the
107 * corresponding commandline option name)
108 * @param timestr the string to be parsed
109 * @param is_duration a flag which tells how to interpret timestr, if
110 * not zero timestr is interpreted as a duration, otherwise as a
115 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
117 typedef struct SpecifierOpt {
118 char *specifier; /**< stream/chapter/program/... specifier */
131 #define HAS_ARG 0x0001
132 #define OPT_BOOL 0x0002
133 #define OPT_EXPERT 0x0004
134 #define OPT_STRING 0x0008
135 #define OPT_VIDEO 0x0010
136 #define OPT_AUDIO 0x0020
137 #define OPT_GRAB 0x0040
138 #define OPT_INT 0x0080
139 #define OPT_FLOAT 0x0100
140 #define OPT_SUBTITLE 0x0200
141 #define OPT_INT64 0x0400
142 #define OPT_EXIT 0x0800
143 #define OPT_DATA 0x1000
144 #define OPT_FUNC2 0x2000
145 #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
146 #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
147 Implies OPT_OFFSET. Next element after the offset is
148 an int containing element count in the array. */
149 #define OPT_TIME 0x10000
150 #define OPT_DOUBLE 0x20000
153 int (*func_arg)(const char *, const char *);
154 int (*func2_arg)(void *, const char *, const char *);
161 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
164 * Show help for all options with given flags in class and all its
167 void show_help_children(const AVClass *class, int flags);
170 * Parse the command line arguments.
172 * @param optctx an opaque options context
173 * @param options Array with the definitions required to interpret every
174 * option of the form: -option_name [argument]
175 * @param parse_arg_function Name of the function called to process every
176 * argument without a leading option name flag. NULL if such arguments do
177 * not have to be processed.
179 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
180 void (* parse_arg_function)(void *optctx, const char*));
183 * Parse one given option.
185 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
187 int parse_option(void *optctx, const char *opt, const char *arg, const OptionDef *options);
190 * Find the '-loglevel' option in the commandline args and apply it.
192 void parse_loglevel(int argc, char **argv, const OptionDef *options);
195 * Check if the given stream matches a stream specifier.
197 * @param s Corresponding format context.
198 * @param st Stream from s to be checked.
199 * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
201 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
203 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
206 * Filter out options for given codec.
208 * Create a new options dictionary containing only the options from
209 * opts which apply to the codec with ID codec_id.
211 * @param s Corresponding format context.
212 * @param st A stream from s for which the options should be filtered.
213 * @return a pointer to the created dictionary
215 AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, AVFormatContext *s, AVStream *st);
218 * Setup AVCodecContext options for avformat_find_stream_info().
220 * Create an array of dictionaries, one dictionary for each stream
222 * Each dictionary will contain the options from codec_opts which can
223 * be applied to the corresponding stream codec context.
225 * @return pointer to the created array of dictionaries, NULL if it
228 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts);
231 * Print an error message to stderr, indicating filename and a human
232 * readable description of the error code err.
234 * If strerror_r() is not available the use of this function in a
235 * multithreaded application may be unsafe.
239 void print_error(const char *filename, int err);
242 * Print the program banner to stderr. The banner contents depend on the
243 * current version of the repository and of the libav* libraries used by
246 void show_banner(void);
249 * Print the version of the program to stdout. The version message
250 * depends on the current versions of the repository and of the libav*
252 * This option processing function does not utilize the arguments.
254 int opt_version(const char *opt, const char *arg);
257 * Print the license of the program to stdout. The license depends on
258 * the license of the libraries compiled into the program.
259 * This option processing function does not utilize the arguments.
261 int opt_license(const char *opt, const char *arg);
264 * Print a listing containing all the formats supported by the
266 * This option processing function does not utilize the arguments.
268 int opt_formats(const char *opt, const char *arg);
271 * Print a listing containing all the codecs supported by the
273 * This option processing function does not utilize the arguments.
275 int opt_codecs(const char *opt, const char *arg);
278 * Print a listing containing all the filters supported by the
280 * This option processing function does not utilize the arguments.
282 int opt_filters(const char *opt, const char *arg);
285 * Print a listing containing all the bit stream filters supported by the
287 * This option processing function does not utilize the arguments.
289 int opt_bsfs(const char *opt, const char *arg);
292 * Print a listing containing all the protocols supported by the
294 * This option processing function does not utilize the arguments.
296 int opt_protocols(const char *opt, const char *arg);
299 * Print a listing containing all the pixel formats supported by the
301 * This option processing function does not utilize the arguments.
303 int opt_pix_fmts(const char *opt, const char *arg);
306 * Print a listing containing all the sample formats supported by the
309 int show_sample_fmts(const char *opt, const char *arg);
312 * Return a positive value if a line read from standard input
313 * starts with [yY], otherwise return 0.
315 int read_yesno(void);
318 * Read the file with name filename, and put its content in a newly
319 * allocated 0-terminated buffer.
321 * @param bufptr location where pointer to buffer is returned
322 * @param size location where size of buffer is returned
323 * @return 0 in case of success, a negative value corresponding to an
324 * AVERROR error code in case of failure.
326 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
329 * Get a file corresponding to a preset file.
331 * If is_path is non-zero, look for the file in the path preset_name.
332 * Otherwise search for a file named arg.ffpreset in the directories
333 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
334 * at configuration time or in a "ffpresets" folder along the executable
335 * on win32, in that order. If no such file is found and
336 * codec_name is defined, then search for a file named
337 * codec_name-preset_name.ffpreset in the above-mentioned directories.
339 * @param filename buffer where the name of the found filename is written
340 * @param filename_size size in bytes of the filename buffer
341 * @param preset_name name of the preset to search
342 * @param is_path tell if preset_name is a filename path
343 * @param codec_name name of the codec for which to look for the
344 * preset, may be NULL
346 FILE *get_preset_file(char *filename, size_t filename_size,
347 const char *preset_name, int is_path, const char *codec_name);
350 * Do all the necessary cleanup and abort.
351 * This function is implemented in the avtools, not cmdutils.
353 void exit_program(int ret);
356 * Realloc array to hold new_size elements of elem_size.
357 * Calls exit_program() on failure.
359 * @param elem_size size in bytes of each element
360 * @param size new element count will be written here
361 * @return reallocated array
363 void *grow_array(void *array, int elem_size, int *size, int new_size);
365 #endif /* CMDUTILS_H */