FFmpeg: cmdutils.h Source File

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cmdutils.h
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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 <stdint.h>
26 
27 #include "libavcodec/avcodec.h"
28 #include "libavfilter/avfilter.h"
29 #include "libavformat/avformat.h"
30 #include "libswscale/swscale.h"
31 
32 #ifdef __MINGW32__
33 #undef main /* We don't want SDL to override our main() */
34 #endif
35 
36 /**
37  * program name, defined by the program for show_version().
38  */
39 extern const char program_name[];
40 
41 /**
42  * program birth year, defined by the program for show_banner()
43  */
44 extern const int program_birth_year;
45 
46 /**
47  * this year, defined by the program for show_banner()
48  */
49 extern const int this_year;
50 
51 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
52 extern AVFormatContext *avformat_opts;
53 extern struct SwsContext *sws_opts;
54 extern AVDictionary *swr_opts;
55 extern AVDictionary *format_opts, *codec_opts, *resample_opts;
56 
57 /**
58  * Register a program-specific cleanup routine.
59  */
60 void register_exit(void (*cb)(int ret));
61 
62 /**
63  * Wraps exit with a program-specific cleanup routine.
64  */
65 void exit_program(int ret);
66 
67 /**
68  * Initialize the cmdutils option system, in particular
69  * allocate the *_opts contexts.
70  */
71 void init_opts(void);
72 /**
73  * Uninitialize the cmdutils option system, in particular
74  * free the *_opts contexts and their contents.
75  */
76 void uninit_opts(void);
77 
78 /**
79  * Trivial log callback.
80  * Only suitable for opt_help and similar since it lacks prefix handling.
81  */
82 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
83 
84 /**
85  * Fallback for options that are not explicitly handled, these will be
86  * parsed through AVOptions.
87  */
88 int opt_default(void *optctx, const char *opt, const char *arg);
89 
90 /**
91  * Set the libav* libraries log level.
92  */
93 int opt_loglevel(void *optctx, const char *opt, const char *arg);
94 
95 int opt_report(const char *opt);
96 
97 int opt_max_alloc(void *optctx, const char *opt, const char *arg);
98 
99 int opt_cpuflags(void *optctx, const char *opt, const char *arg);
100 
101 int opt_codec_debug(void *optctx, const char *opt, const char *arg);
102 
103 int opt_opencl(void *optctx, const char *opt, const char *arg);
104 
105 /**
106  * Limit the execution time.
107  */
108 int opt_timelimit(void *optctx, const char *opt, const char *arg);
109 
110 /**
111  * Parse a string and return its corresponding value as a double.
112  * Exit from the application if the string cannot be correctly
113  * parsed or the corresponding value is invalid.
114  *
115  * @param context the context of the value to be set (e.g. the
116  * corresponding command line option name)
117  * @param numstr the string to be parsed
118  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
119  * string should be parsed
120  * @param min the minimum valid accepted value
121  * @param max the maximum valid accepted value
122  */
123 double parse_number_or_die(const char *context, const char *numstr, int type,
124  double min, double max);
125 
126 /**
127  * Parse a string specifying a time and return its corresponding
128  * value as a number of microseconds. Exit from the application if
129  * the string cannot be correctly parsed.
130  *
131  * @param context the context of the value to be set (e.g. the
132  * corresponding command line option name)
133  * @param timestr the string to be parsed
134  * @param is_duration a flag which tells how to interpret timestr, if
135  * not zero timestr is interpreted as a duration, otherwise as a
136  * date
137  *
138  * @see av_parse_time()
139  */
140 int64_t parse_time_or_die(const char *context, const char *timestr,
141  int is_duration);
142 
143  typedef struct SpecifierOpt {
144   char *specifier; /**< stream/chapter/program/... specifier */
145  union {
146   uint8_t *str;
147   int i;
148   int64_t i64;
149   float f;
150   double dbl;
151  } u;
152 } SpecifierOpt;
153 
154  typedef struct OptionDef {
155   const char *name;
156   int flags;
157  #define HAS_ARG 0x0001
158  #define OPT_BOOL 0x0002
159  #define OPT_EXPERT 0x0004
160  #define OPT_STRING 0x0008
161  #define OPT_VIDEO 0x0010
162  #define OPT_AUDIO 0x0020
163  #define OPT_INT 0x0080
164  #define OPT_FLOAT 0x0100
165  #define OPT_SUBTITLE 0x0200
166  #define OPT_INT64 0x0400
167  #define OPT_EXIT 0x0800
168  #define OPT_DATA 0x1000
169  #define OPT_PERFILE 0x2000 /* the option is per-file (currently ffmpeg-only).
170   implied by OPT_OFFSET or OPT_SPEC */
171  #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
172  #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
173   Implies OPT_OFFSET. Next element after the offset is
174   an int containing element count in the array. */
175  #define OPT_TIME 0x10000
176 #define OPT_DOUBLE 0x20000
177  #define OPT_INPUT 0x40000
178  #define OPT_OUTPUT 0x80000
179   union {
180  void *dst_ptr;
181   int (*func_arg)(void *, const char *, const char *);
182   size_t off;
183  } u;
184  const char *help;
185  const char *argname;
186 } OptionDef;
187 
188 /**
189  * Print help for all options matching specified flags.
190  *
191  * @param options a list of options
192  * @param msg title of this group. Only printed if at least one option matches.
193  * @param req_flags print only options which have all those flags set.
194  * @param rej_flags don't print options which have any of those flags set.
195  * @param alt_flags print only options that have at least one of those flags set
196  */
197 void show_help_options(const OptionDef *options, const char *msg, int req_flags,
198  int rej_flags, int alt_flags);
199 
200 /**
201  * Show help for all options with given flags in class and all its
202  * children.
203  */
204 void show_help_children(const AVClass *class, int flags);
205 
206 /**
207  * Per-fftool specific help handler. Implemented in each
208  * fftool, called by show_help().
209  */
210 void show_help_default(const char *opt, const char *arg);
211 
212 /**
213  * Generic -h handler common to all fftools.
214  */
215 int show_help(void *optctx, const char *opt, const char *arg);
216 
217 /**
218  * Parse the command line arguments.
219  *
220  * @param optctx an opaque options context
221  * @param argc number of command line arguments
222  * @param argv values of command line arguments
223  * @param options Array with the definitions required to interpret every
224  * option of the form: -option_name [argument]
225  * @param parse_arg_function Name of the function called to process every
226  * argument without a leading option name flag. NULL if such arguments do
227  * not have to be processed.
228  */
229 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
230  void (* parse_arg_function)(void *optctx, const char*));
231 
232 /**
233  * Parse one given option.
234  *
235  * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
236  */
237 int parse_option(void *optctx, const char *opt, const char *arg,
238  const OptionDef *options);
239 
240 /**
241  * An option extracted from the commandline.
242   * Cannot use AVDictionary because of options like -map which can be
243   * used multiple times.
244   */
245  typedef struct Option {
246  const OptionDef *opt;
247  const char *key;
248   const char *val;
249 } Option;
250  
251 typedef struct OptionGroupDef {
252  /**< group name */
253  const char *name;
254  /**
255   * Option to be used as group separator. Can be NULL for groups which
256  * are terminated by a non-option argument (e.g. ffmpeg output files)
257  */
258  const char *sep;
259  /**
260   * Option flags that must be set on each option that is
261  * applied to this group
262  */
263   int flags;
264  } OptionGroupDef;
265  
266 typedef struct OptionGroup {
267   const OptionGroupDef *group_def;
268   const char *arg;
269 
270   Option *opts;
271   int nb_opts;
272  
273   AVDictionary *codec_opts;
274   AVDictionary *format_opts;
275  AVDictionary *resample_opts;
276  struct SwsContext *sws_opts;
277  AVDictionary *swr_opts;
278 } OptionGroup;
279 
280 /**
281   * A list of option groups that all have the same group type
282   * (e.g. input files or output files)
283  */
284  typedef struct OptionGroupList {
285   const OptionGroupDef *group_def;
286 
287  OptionGroup *groups;
288   int nb_groups;
289  } OptionGroupList;
290 
291  typedef struct OptionParseContext {
292   OptionGroup global_opts;
293 
294  OptionGroupList *groups;
295   int nb_groups;
296 
297  /* parsing state */
298  OptionGroup cur_group;
299 } OptionParseContext;
300 
301 /**
302  * Parse an options group and write results into optctx.
303  *
304  * @param optctx an app-specific options context. NULL for global options group
305  */
306 int parse_optgroup(void *optctx, OptionGroup *g);
307 
308 /**
309  * Split the commandline into an intermediate form convenient for further
310  * processing.
311  *
312  * The commandline is assumed to be composed of options which either belong to a
313  * group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global
314  * (everything else).
315  *
316  * A group (defined by an OptionGroupDef struct) is a sequence of options
317  * terminated by either a group separator option (e.g. -i) or a parameter that
318  * is not an option (doesn't start with -). A group without a separator option
319  * must always be first in the supplied groups list.
320  *
321  * All options within the same group are stored in one OptionGroup struct in an
322  * OptionGroupList, all groups with the same group definition are stored in one
323  * OptionGroupList in OptionParseContext.groups. The order of group lists is the
324  * same as the order of group definitions.
325  */
326 int split_commandline(OptionParseContext *octx, int argc, char *argv[],
327  const OptionDef *options,
328  const OptionGroupDef *groups, int nb_groups);
329 
330 /**
331  * Free all allocated memory in an OptionParseContext.
332  */
333 void uninit_parse_context(OptionParseContext *octx);
334 
335 /**
336  * Find the '-loglevel' option in the command line args and apply it.
337  */
338 void parse_loglevel(int argc, char **argv, const OptionDef *options);
339 
340 /**
341  * Return index of option opt in argv or 0 if not found.
342  */
343 int locate_option(int argc, char **argv, const OptionDef *options,
344  const char *optname);
345 
346 /**
347  * Check if the given stream matches a stream specifier.
348  *
349  * @param s Corresponding format context.
350  * @param st Stream from s to be checked.
351  * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
352  *
353  * @return 1 if the stream matches, 0 if it doesn't, <0 on error
354  */
355 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
356 
357 /**
358  * Filter out options for given codec.
359  *
360  * Create a new options dictionary containing only the options from
361  * opts which apply to the codec with ID codec_id.
362  *
363  * @param opts dictionary to place options in
364  * @param codec_id ID of the codec that should be filtered for
365  * @param s Corresponding format context.
366  * @param st A stream from s for which the options should be filtered.
367  * @param codec The particular codec for which the options should be filtered.
368  * If null, the default one is looked up according to the codec id.
369  * @return a pointer to the created dictionary
370  */
371 AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
372  AVFormatContext *s, AVStream *st, AVCodec *codec);
373 
374 /**
375  * Setup AVCodecContext options for avformat_find_stream_info().
376  *
377  * Create an array of dictionaries, one dictionary for each stream
378  * contained in s.
379  * Each dictionary will contain the options from codec_opts which can
380  * be applied to the corresponding stream codec context.
381  *
382  * @return pointer to the created array of dictionaries, NULL if it
383  * cannot be created
384  */
385 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
386  AVDictionary *codec_opts);
387 
388 /**
389  * Print an error message to stderr, indicating filename and a human
390  * readable description of the error code err.
391  *
392  * If strerror_r() is not available the use of this function in a
393  * multithreaded application may be unsafe.
394  *
395  * @see av_strerror()
396  */
397 void print_error(const char *filename, int err);
398 
399 /**
400  * Print the program banner to stderr. The banner contents depend on the
401  * current version of the repository and of the libav* libraries used by
402  * the program.
403  */
404 void show_banner(int argc, char **argv, const OptionDef *options);
405 
406 /**
407  * Print the version of the program to stdout. The version message
408  * depends on the current versions of the repository and of the libav*
409  * libraries.
410  * This option processing function does not utilize the arguments.
411  */
412 int show_version(void *optctx, const char *opt, const char *arg);
413 
414 /**
415  * Print the license of the program to stdout. The license depends on
416  * the license of the libraries compiled into the program.
417  * This option processing function does not utilize the arguments.
418  */
419 int show_license(void *optctx, const char *opt, const char *arg);
420 
421 /**
422  * Print a listing containing all the formats supported by the
423  * program.
424  * This option processing function does not utilize the arguments.
425  */
426 int show_formats(void *optctx, const char *opt, const char *arg);
427 
428 /**
429  * Print a listing containing all the codecs supported by the
430  * program.
431  * This option processing function does not utilize the arguments.
432  */
433 int show_codecs(void *optctx, const char *opt, const char *arg);
434 
435 /**
436  * Print a listing containing all the decoders supported by the
437  * program.
438  */
439 int show_decoders(void *optctx, const char *opt, const char *arg);
440 
441 /**
442  * Print a listing containing all the encoders supported by the
443  * program.
444  */
445 int show_encoders(void *optctx, const char *opt, const char *arg);
446 
447 /**
448  * Print a listing containing all the filters supported by the
449  * program.
450  * This option processing function does not utilize the arguments.
451  */
452 int show_filters(void *optctx, const char *opt, const char *arg);
453 
454 /**
455  * Print a listing containing all the bit stream filters supported by the
456  * program.
457  * This option processing function does not utilize the arguments.
458  */
459 int show_bsfs(void *optctx, const char *opt, const char *arg);
460 
461 /**
462  * Print a listing containing all the protocols supported by the
463  * program.
464  * This option processing function does not utilize the arguments.
465  */
466 int show_protocols(void *optctx, const char *opt, const char *arg);
467 
468 /**
469  * Print a listing containing all the pixel formats supported by the
470  * program.
471  * This option processing function does not utilize the arguments.
472  */
473 int show_pix_fmts(void *optctx, const char *opt, const char *arg);
474 
475 /**
476  * Print a listing containing all the standard channel layouts supported by
477  * the program.
478  * This option processing function does not utilize the arguments.
479  */
480 int show_layouts(void *optctx, const char *opt, const char *arg);
481 
482 /**
483  * Print a listing containing all the sample formats supported by the
484  * program.
485  */
486 int show_sample_fmts(void *optctx, const char *opt, const char *arg);
487 
488 /**
489  * Return a positive value if a line read from standard input
490  * starts with [yY], otherwise return 0.
491  */
492 int read_yesno(void);
493 
494 /**
495  * Read the file with name filename, and put its content in a newly
496  * allocated 0-terminated buffer.
497  *
498  * @param filename file to read from
499  * @param bufptr location where pointer to buffer is returned
500  * @param size location where size of buffer is returned
501  * @return 0 in case of success, a negative value corresponding to an
502  * AVERROR error code in case of failure.
503  */
504 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
505 
506 /**
507  * Get a file corresponding to a preset file.
508  *
509  * If is_path is non-zero, look for the file in the path preset_name.
510  * Otherwise search for a file named arg.ffpreset in the directories
511  * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
512  * at configuration time or in a "ffpresets" folder along the executable
513  * on win32, in that order. If no such file is found and
514  * codec_name is defined, then search for a file named
515  * codec_name-preset_name.avpreset in the above-mentioned directories.
516  *
517  * @param filename buffer where the name of the found filename is written
518  * @param filename_size size in bytes of the filename buffer
519  * @param preset_name name of the preset to search
520  * @param is_path tell if preset_name is a filename path
521  * @param codec_name name of the codec for which to look for the
522  * preset, may be NULL
523  */
524 FILE *get_preset_file(char *filename, size_t filename_size,
525  const char *preset_name, int is_path, const char *codec_name);
526 
527 /**
528  * Realloc array to hold new_size elements of elem_size.
529  * Calls exit() on failure.
530  *
531  * @param array array to reallocate
532  * @param elem_size size in bytes of each element
533  * @param size new element count will be written here
534  * @param new_size number of elements to place in reallocated array
535  * @return reallocated array
536   */
537 void *grow_array(void *array, int elem_size, int *size, int new_size);
538  
539 #define media_type_string av_get_media_type_string
540 
541  #define GROW_ARRAY(array, nb_elems)\
542  array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1)
543 
544  #define GET_PIX_FMT_NAME(pix_fmt)\
545  const char *name = av_get_pix_fmt_name(pix_fmt);
546 
547  #define GET_SAMPLE_FMT_NAME(sample_fmt)\
548  const char *name = av_get_sample_fmt_name(sample_fmt)
549 
550 #define GET_SAMPLE_RATE_NAME(rate)\
551   char name[16];\
552  snprintf(name, sizeof(name), "%d", rate);
553 
554 #define GET_CH_LAYOUT_NAME(ch_layout)\
555   char name[16];\
556  snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
557 
558 #define GET_CH_LAYOUT_DESC(ch_layout)\
559  char name[128];\
560  av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
561 
562 #endif /* CMDUTILS_H */
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