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);
80 * Limit the execution time.
82 int opt_timelimit(const char *opt, const char *arg);
85 * Parse a string and return its corresponding value as a double.
86 * Exit from the application if the string cannot be correctly
87 * parsed or the corresponding value is invalid.
89 * @param context the context of the value to be set (e.g. the
90 * corresponding commandline option name)
91 * @param numstr the string to be parsed
92 * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
93 * string should be parsed
94 * @param min the minimum valid accepted value
95 * @param max the maximum valid accepted value
97 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
100 * Parse a string specifying a time and return its corresponding
101 * value as a number of microseconds. Exit from the application if
102 * the string cannot be correctly parsed.
104 * @param context the context of the value to be set (e.g. the
105 * corresponding commandline option name)
106 * @param timestr the string to be parsed
107 * @param is_duration a flag which tells how to interpret timestr, if
108 * not zero timestr is interpreted as a duration, otherwise as a
113 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
115 typedef struct SpecifierOpt {
116 char *specifier; /**< stream/chapter/program/... specifier */
129 #define HAS_ARG 0x0001
130 #define OPT_BOOL 0x0002
131 #define OPT_EXPERT 0x0004
132 #define OPT_STRING 0x0008
133 #define OPT_VIDEO 0x0010
134 #define OPT_AUDIO 0x0020
135 #define OPT_GRAB 0x0040
136 #define OPT_INT 0x0080
137 #define OPT_FLOAT 0x0100
138 #define OPT_SUBTITLE 0x0200
139 #define OPT_INT64 0x0400
140 #define OPT_EXIT 0x0800
141 #define OPT_DATA 0x1000
142 #define OPT_FUNC2 0x2000
143 #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
144 #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
145 Implies OPT_OFFSET. Next element after the offset is
146 an int containing element count in the array. */
147 #define OPT_TIME 0x10000
148 #define OPT_DOUBLE 0x20000
151 int (*func_arg)(const char *, const char *);
152 int (*func2_arg)(void *, const char *, const char *);
159 void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
162 * Parse the command line arguments.
164 * @param optctx an opaque options context
165 * @param options Array with the definitions required to interpret every
166 * option of the form: -option_name [argument]
167 * @param parse_arg_function Name of the function called to process every
168 * argument without a leading option name flag. NULL if such arguments do
169 * not have to be processed.
171 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
172 void (* parse_arg_function)(void *optctx, const char*));
175 * Parse one given option.
177 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
179 int parse_option(void *optctx, const char *opt, const char *arg, const OptionDef *options);
182 * Check if the given stream matches a stream specifier.
184 * @param s Corresponding format context.
185 * @param st Stream from s to be checked.
186 * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
188 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
190 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
193 * Filter out options for given codec.
195 * Create a new options dictionary containing only the options from
196 * opts which apply to the codec with ID codec_id.
198 * @param s Corresponding format context.
199 * @param st A stream from s for which the options should be filtered.
200 * @return a pointer to the created dictionary
202 AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, AVFormatContext *s, AVStream *st);
205 * Setup AVCodecContext options for avformat_find_stream_info().
207 * Create an array of dictionaries, one dictionary for each stream
209 * Each dictionary will contain the options from codec_opts which can
210 * be applied to the corresponding stream codec context.
212 * @return pointer to the created array of dictionaries, NULL if it
215 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts);
218 * Print an error message to stderr, indicating filename and a human
219 * readable description of the error code err.
221 * If strerror_r() is not available the use of this function in a
222 * multithreaded application may be unsafe.
226 void print_error(const char *filename, int err);
229 * Print the program banner to stderr. The banner contents depend on the
230 * current version of the repository and of the libav* libraries used by
233 void show_banner(void);
236 * Print the version of the program to stdout. The version message
237 * depends on the current versions of the repository and of the libav*
239 * This option processing function does not utilize the arguments.
241 int opt_version(const char *opt, const char *arg);
244 * Print the license of the program to stdout. The license depends on
245 * the license of the libraries compiled into the program.
246 * This option processing function does not utilize the arguments.
248 int opt_license(const char *opt, const char *arg);
251 * Print a listing containing all the formats supported by the
253 * This option processing function does not utilize the arguments.
255 int opt_formats(const char *opt, const char *arg);
258 * Print a listing containing all the codecs supported by the
260 * This option processing function does not utilize the arguments.
262 int opt_codecs(const char *opt, const char *arg);
265 * Print a listing containing all the filters supported by the
267 * This option processing function does not utilize the arguments.
269 int opt_filters(const char *opt, const char *arg);
272 * Print a listing containing all the bit stream filters supported by the
274 * This option processing function does not utilize the arguments.
276 int opt_bsfs(const char *opt, const char *arg);
279 * Print a listing containing all the protocols supported by the
281 * This option processing function does not utilize the arguments.
283 int opt_protocols(const char *opt, const char *arg);
286 * Print a listing containing all the pixel formats supported by the
288 * This option processing function does not utilize the arguments.
290 int opt_pix_fmts(const char *opt, const char *arg);
293 * Print a listing containing all the sample formats supported by the
296 int show_sample_fmts(const char *opt, const char *arg);
299 * Return a positive value if a line read from standard input
300 * starts with [yY], otherwise return 0.
302 int read_yesno(void);
305 * Read the file with name filename, and put its content in a newly
306 * allocated 0-terminated buffer.
308 * @param bufptr location where pointer to buffer is returned
309 * @param size location where size of buffer is returned
310 * @return 0 in case of success, a negative value corresponding to an
311 * AVERROR error code in case of failure.
313 int read_file(const char *filename, char **bufptr, size_t *size);
316 * Get a file corresponding to a preset file.
318 * If is_path is non-zero, look for the file in the path preset_name.
319 * Otherwise search for a file named arg.ffpreset in the directories
320 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
321 * at configuration time or in a "ffpresets" folder along the executable
322 * on win32, in that order. If no such file is found and
323 * codec_name is defined, then search for a file named
324 * codec_name-preset_name.ffpreset in the above-mentioned directories.
326 * @param filename buffer where the name of the found filename is written
327 * @param filename_size size in bytes of the filename buffer
328 * @param preset_name name of the preset to search
329 * @param is_path tell if preset_name is a filename path
330 * @param codec_name name of the codec for which to look for the
331 * preset, may be NULL
333 FILE *get_preset_file(char *filename, size_t filename_size,
334 const char *preset_name, int is_path, const char *codec_name);
337 * Do all the necessary cleanup and abort.
338 * This function is implemented in the avtools, not cmdutils.
340 void exit_program(int ret);
343 * Realloc array to hold new_size elements of elem_size.
344 * Calls exit_program() on failure.
346 * @param elem_size size in bytes of each element
347 * @param size new element count will be written here
348 * @return reallocated array
350 void *grow_array(void *array, int elem_size, int *size, int new_size);
352 #endif /* LIBAV_CMDUTILS_H */