FFmpeg: cmdutils.h Source File

FFmpeg
[フレーム]
cmdutils.h
Go to the documentation of this file.
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 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
47 extern AVFormatContext *avformat_opts;
48 extern struct SwsContext *sws_opts;
49 extern AVDictionary *swr_opts;
50 extern AVDictionary *format_opts, *codec_opts, *resample_opts;
51 extern int hide_banner;
52 
53 /**
54  * Register a program-specific cleanup routine.
55  */
56 void register_exit(void (*cb)(int ret));
57 
58 /**
59  * Wraps exit with a program-specific cleanup routine.
60  */
61 void exit_program(int ret);
62 
63 /**
64  * Initialize the cmdutils option system, in particular
65  * allocate the *_opts contexts.
66  */
67 void init_opts(void);
68 /**
69  * Uninitialize the cmdutils option system, in particular
70  * free the *_opts contexts and their contents.
71  */
72 void uninit_opts(void);
73 
74 /**
75  * Trivial log callback.
76  * Only suitable for opt_help and similar since it lacks prefix handling.
77  */
78 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
79 
80 /**
81  * Override the cpuflags.
82  */
83 int opt_cpuflags(void *optctx, const char *opt, const char *arg);
84 
85 /**
86  * Fallback for options that are not explicitly handled, these will be
87  * parsed through AVOptions.
88  */
89 int opt_default(void *optctx, const char *opt, const char *arg);
90 
91 /**
92  * Set the libav* libraries log level.
93  */
94 int opt_loglevel(void *optctx, const char *opt, const char *arg);
95 
96 int opt_report(const char *opt);
97 
98 int opt_max_alloc(void *optctx, const char *opt, const char *arg);
99 
100 int opt_codec_debug(void *optctx, const char *opt, const char *arg);
101 
102 #if CONFIG_OPENCL
103 int opt_opencl(void *optctx, const char *opt, const char *arg);
104 
105 int opt_opencl_bench(void *optctx, const char *opt, const char *arg);
106 #endif
107 
108 /**
109  * Limit the execution time.
110  */
111 int opt_timelimit(void *optctx, const char *opt, const char *arg);
112 
113 /**
114  * Parse a string and return its corresponding value as a double.
115  * Exit from the application if the string cannot be correctly
116  * parsed or the corresponding value is invalid.
117  *
118  * @param context the context of the value to be set (e.g. the
119  * corresponding command line option name)
120  * @param numstr the string to be parsed
121  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
122  * string should be parsed
123  * @param min the minimum valid accepted value
124  * @param max the maximum valid accepted value
125  */
126 double parse_number_or_die(const char *context, const char *numstr, int type,
127  double min, double max);
128 
129 /**
130  * Parse a string specifying a time and return its corresponding
131  * value as a number of microseconds. Exit from the application if
132  * the string cannot be correctly parsed.
133  *
134  * @param context the context of the value to be set (e.g. the
135  * corresponding command line option name)
136  * @param timestr the string to be parsed
137  * @param is_duration a flag which tells how to interpret timestr, if
138  * not zero timestr is interpreted as a duration, otherwise as a
139  * date
140  *
141  * @see av_parse_time()
142  */
143 int64_t parse_time_or_die(const char *context, const char *timestr,
144  int is_duration);
145 
146  typedef struct SpecifierOpt {
147   char *specifier; /**< stream/chapter/program/... specifier */
148  union {
149   uint8_t *str;
150   int i;
151   int64_t i64;
152   float f;
153   double dbl;
154  } u;
155 } SpecifierOpt;
156 
157  typedef struct OptionDef {
158   const char *name;
159   int flags;
160  #define HAS_ARG 0x0001
161  #define OPT_BOOL 0x0002
162  #define OPT_EXPERT 0x0004
163  #define OPT_STRING 0x0008
164  #define OPT_VIDEO 0x0010
165  #define OPT_AUDIO 0x0020
166  #define OPT_INT 0x0080
167  #define OPT_FLOAT 0x0100
168  #define OPT_SUBTITLE 0x0200
169  #define OPT_INT64 0x0400
170  #define OPT_EXIT 0x0800
171  #define OPT_DATA 0x1000
172  #define OPT_PERFILE 0x2000 /* the option is per-file (currently ffmpeg-only).
173   implied by OPT_OFFSET or OPT_SPEC */
174  #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
175  #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
176   Implies OPT_OFFSET. Next element after the offset is
177   an int containing element count in the array. */
178  #define OPT_TIME 0x10000
179 #define OPT_DOUBLE 0x20000
180  #define OPT_INPUT 0x40000
181  #define OPT_OUTPUT 0x80000
182   union {
183  void *dst_ptr;
184   int (*func_arg)(void *, const char *, const char *);
185   size_t off;
186  } u;
187  const char *help;
188  const char *argname;
189 } OptionDef;
190 
191 /**
192  * Print help for all options matching specified flags.
193  *
194  * @param options a list of options
195  * @param msg title of this group. Only printed if at least one option matches.
196  * @param req_flags print only options which have all those flags set.
197  * @param rej_flags don't print options which have any of those flags set.
198  * @param alt_flags print only options that have at least one of those flags set
199  */
200 void show_help_options(const OptionDef *options, const char *msg, int req_flags,
201  int rej_flags, int alt_flags);
202 
203 /**
204  * Show help for all options with given flags in class and all its
205  * children.
206  */
207 void show_help_children(const AVClass *class, int flags);
208 
209 /**
210  * Per-fftool specific help handler. Implemented in each
211  * fftool, called by show_help().
212  */
213 void show_help_default(const char *opt, const char *arg);
214 
215 /**
216  * Generic -h handler common to all fftools.
217  */
218 int show_help(void *optctx, const char *opt, const char *arg);
219 
220 /**
221  * Parse the command line arguments.
222  *
223  * @param optctx an opaque options context
224  * @param argc number of command line arguments
225  * @param argv values of command line arguments
226  * @param options Array with the definitions required to interpret every
227  * option of the form: -option_name [argument]
228  * @param parse_arg_function Name of the function called to process every
229  * argument without a leading option name flag. NULL if such arguments do
230  * not have to be processed.
231  */
232 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
233  void (* parse_arg_function)(void *optctx, const char*));
234 
235 /**
236  * Parse one given option.
237  *
238  * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
239  */
240 int parse_option(void *optctx, const char *opt, const char *arg,
241  const OptionDef *options);
242 
243 /**
244  * An option extracted from the commandline.
245   * Cannot use AVDictionary because of options like -map which can be
246   * used multiple times.
247   */
248  typedef struct Option {
249  const OptionDef *opt;
250  const char *key;
251   const char *val;
252 } Option;
253  
254 typedef struct OptionGroupDef {
255  /**< group name */
256  const char *name;
257  /**
258   * Option to be used as group separator. Can be NULL for groups which
259  * are terminated by a non-option argument (e.g. ffmpeg output files)
260  */
261  const char *sep;
262  /**
263   * Option flags that must be set on each option that is
264  * applied to this group
265  */
266   int flags;
267  } OptionGroupDef;
268  
269 typedef struct OptionGroup {
270   const OptionGroupDef *group_def;
271   const char *arg;
272 
273   Option *opts;
274   int nb_opts;
275  
276   AVDictionary *codec_opts;
277   AVDictionary *format_opts;
278  AVDictionary *resample_opts;
279  struct SwsContext *sws_opts;
280  AVDictionary *swr_opts;
281 } OptionGroup;
282 
283 /**
284   * A list of option groups that all have the same group type
285   * (e.g. input files or output files)
286  */
287  typedef struct OptionGroupList {
288   const OptionGroupDef *group_def;
289 
290  OptionGroup *groups;
291   int nb_groups;
292  } OptionGroupList;
293 
294  typedef struct OptionParseContext {
295   OptionGroup global_opts;
296 
297  OptionGroupList *groups;
298   int nb_groups;
299 
300  /* parsing state */
301  OptionGroup cur_group;
302 } OptionParseContext;
303 
304 /**
305  * Parse an options group and write results into optctx.
306  *
307  * @param optctx an app-specific options context. NULL for global options group
308  */
309 int parse_optgroup(void *optctx, OptionGroup *g);
310 
311 /**
312  * Split the commandline into an intermediate form convenient for further
313  * processing.
314  *
315  * The commandline is assumed to be composed of options which either belong to a
316  * group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global
317  * (everything else).
318  *
319  * A group (defined by an OptionGroupDef struct) is a sequence of options
320  * terminated by either a group separator option (e.g. -i) or a parameter that
321  * is not an option (doesn't start with -). A group without a separator option
322  * must always be first in the supplied groups list.
323  *
324  * All options within the same group are stored in one OptionGroup struct in an
325  * OptionGroupList, all groups with the same group definition are stored in one
326  * OptionGroupList in OptionParseContext.groups. The order of group lists is the
327  * same as the order of group definitions.
328  */
329 int split_commandline(OptionParseContext *octx, int argc, char *argv[],
330  const OptionDef *options,
331  const OptionGroupDef *groups, int nb_groups);
332 
333 /**
334  * Free all allocated memory in an OptionParseContext.
335  */
336 void uninit_parse_context(OptionParseContext *octx);
337 
338 /**
339  * Find the '-loglevel' option in the command line args and apply it.
340  */
341 void parse_loglevel(int argc, char **argv, const OptionDef *options);
342 
343 /**
344  * Return index of option opt in argv or 0 if not found.
345  */
346 int locate_option(int argc, char **argv, const OptionDef *options,
347  const char *optname);
348 
349 /**
350  * Check if the given stream matches a stream specifier.
351  *
352  * @param s Corresponding format context.
353  * @param st Stream from s to be checked.
354  * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
355  *
356  * @return 1 if the stream matches, 0 if it doesn't, <0 on error
357  */
358 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
359 
360 /**
361  * Filter out options for given codec.
362  *
363  * Create a new options dictionary containing only the options from
364  * opts which apply to the codec with ID codec_id.
365  *
366  * @param opts dictionary to place options in
367  * @param codec_id ID of the codec that should be filtered for
368  * @param s Corresponding format context.
369  * @param st A stream from s for which the options should be filtered.
370  * @param codec The particular codec for which the options should be filtered.
371  * If null, the default one is looked up according to the codec id.
372  * @return a pointer to the created dictionary
373  */
374 AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
375  AVFormatContext *s, AVStream *st, AVCodec *codec);
376 
377 /**
378  * Setup AVCodecContext options for avformat_find_stream_info().
379  *
380  * Create an array of dictionaries, one dictionary for each stream
381  * contained in s.
382  * Each dictionary will contain the options from codec_opts which can
383  * be applied to the corresponding stream codec context.
384  *
385  * @return pointer to the created array of dictionaries, NULL if it
386  * cannot be created
387  */
388 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
389  AVDictionary *codec_opts);
390 
391 /**
392  * Print an error message to stderr, indicating filename and a human
393  * readable description of the error code err.
394  *
395  * If strerror_r() is not available the use of this function in a
396  * multithreaded application may be unsafe.
397  *
398  * @see av_strerror()
399  */
400 void print_error(const char *filename, int err);
401 
402 /**
403  * Print the program banner to stderr. The banner contents depend on the
404  * current version of the repository and of the libav* libraries used by
405  * the program.
406  */
407 void show_banner(int argc, char **argv, const OptionDef *options);
408 
409 /**
410  * Print the version of the program to stdout. The version message
411  * depends on the current versions of the repository and of the libav*
412  * libraries.
413  * This option processing function does not utilize the arguments.
414  */
415 int show_version(void *optctx, const char *opt, const char *arg);
416 
417 /**
418  * Print the build configuration of the program to stdout. The contents
419  * depend on the definition of FFMPEG_CONFIGURATION.
420  * This option processing function does not utilize the arguments.
421  */
422 int show_buildconf(void *optctx, const char *opt, const char *arg);
423 
424 /**
425  * Print the license of the program to stdout. The license depends on
426  * the license of the libraries compiled into the program.
427  * This option processing function does not utilize the arguments.
428  */
429 int show_license(void *optctx, const char *opt, const char *arg);
430 
431 /**
432  * Print a listing containing all the formats supported by the
433  * program.
434  * This option processing function does not utilize the arguments.
435  */
436 int show_formats(void *optctx, const char *opt, const char *arg);
437 
438 /**
439  * Print a listing containing all the codecs supported by the
440  * program.
441  * This option processing function does not utilize the arguments.
442  */
443 int show_codecs(void *optctx, const char *opt, const char *arg);
444 
445 /**
446  * Print a listing containing all the decoders supported by the
447  * program.
448  */
449 int show_decoders(void *optctx, const char *opt, const char *arg);
450 
451 /**
452  * Print a listing containing all the encoders supported by the
453  * program.
454  */
455 int show_encoders(void *optctx, const char *opt, const char *arg);
456 
457 /**
458  * Print a listing containing all the filters supported by the
459  * program.
460  * This option processing function does not utilize the arguments.
461  */
462 int show_filters(void *optctx, const char *opt, const char *arg);
463 
464 /**
465  * Print a listing containing all the bit stream filters supported by the
466  * program.
467  * This option processing function does not utilize the arguments.
468  */
469 int show_bsfs(void *optctx, const char *opt, const char *arg);
470 
471 /**
472  * Print a listing containing all the protocols supported by the
473  * program.
474  * This option processing function does not utilize the arguments.
475  */
476 int show_protocols(void *optctx, const char *opt, const char *arg);
477 
478 /**
479  * Print a listing containing all the pixel formats supported by the
480  * program.
481  * This option processing function does not utilize the arguments.
482  */
483 int show_pix_fmts(void *optctx, const char *opt, const char *arg);
484 
485 /**
486  * Print a listing containing all the standard channel layouts supported by
487  * the program.
488  * This option processing function does not utilize the arguments.
489  */
490 int show_layouts(void *optctx, const char *opt, const char *arg);
491 
492 /**
493  * Print a listing containing all the sample formats supported by the
494  * program.
495  */
496 int show_sample_fmts(void *optctx, const char *opt, const char *arg);
497 
498 /**
499  * Print a listing containing all the color names and values recognized
500  * by the program.
501  */
502 int show_colors(void *optctx, const char *opt, const char *arg);
503 
504 /**
505  * Return a positive value if a line read from standard input
506  * starts with [yY], otherwise return 0.
507  */
508 int read_yesno(void);
509 
510 /**
511  * Read the file with name filename, and put its content in a newly
512  * allocated 0-terminated buffer.
513  *
514  * @param filename file to read from
515  * @param bufptr location where pointer to buffer is returned
516  * @param size location where size of buffer is returned
517  * @return >= 0 in case of success, a negative value corresponding to an
518  * AVERROR error code in case of failure.
519  */
520 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
521 
522 /**
523  * Get a file corresponding to a preset file.
524  *
525  * If is_path is non-zero, look for the file in the path preset_name.
526  * Otherwise search for a file named arg.ffpreset in the directories
527  * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
528  * at configuration time or in a "ffpresets" folder along the executable
529  * on win32, in that order. If no such file is found and
530  * codec_name is defined, then search for a file named
531  * codec_name-preset_name.avpreset in the above-mentioned directories.
532  *
533  * @param filename buffer where the name of the found filename is written
534  * @param filename_size size in bytes of the filename buffer
535  * @param preset_name name of the preset to search
536  * @param is_path tell if preset_name is a filename path
537  * @param codec_name name of the codec for which to look for the
538  * preset, may be NULL
539  */
540 FILE *get_preset_file(char *filename, size_t filename_size,
541  const char *preset_name, int is_path, const char *codec_name);
542 
543 /**
544  * Realloc array to hold new_size elements of elem_size.
545  * Calls exit() on failure.
546  *
547  * @param array array to reallocate
548  * @param elem_size size in bytes of each element
549  * @param size new element count will be written here
550  * @param new_size number of elements to place in reallocated array
551  * @return reallocated array
552   */
553 void *grow_array(void *array, int elem_size, int *size, int new_size);
554  
555 #define media_type_string av_get_media_type_string
556 
557  #define GROW_ARRAY(array, nb_elems)\
558  array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1)
559 
560  #define GET_PIX_FMT_NAME(pix_fmt)\
561  const char *name = av_get_pix_fmt_name(pix_fmt);
562 
563  #define GET_SAMPLE_FMT_NAME(sample_fmt)\
564  const char *name = av_get_sample_fmt_name(sample_fmt)
565 
566 #define GET_SAMPLE_RATE_NAME(rate)\
567   char name[16];\
568  snprintf(name, sizeof(name), "%d", rate);
569 
570 #define GET_CH_LAYOUT_NAME(ch_layout)\
571   char name[16];\
572  snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
573 
574 #define GET_CH_LAYOUT_DESC(ch_layout)\
575  char name[128];\
576  av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
577 
578 #endif /* CMDUTILS_H */
Generated on Sun Mar 23 2014 23:49:48 for FFmpeg by   doxygen 1.8.2

AltStyle によって変換されたページ (->オリジナル) /