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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 
53 extern struct SwsContext *sws_opts;
54 extern AVDictionary *swr_opts;
56 
57 /**
58  * Initialize the cmdutils option system, in particular
59  * allocate the *_opts contexts.
60  */
61 void init_opts(void);
62 /**
63  * Uninitialize the cmdutils option system, in particular
64  * free the *_opts contexts and their contents.
65  */
66 void uninit_opts(void);
67 
68 /**
69  * Trivial log callback.
70  * Only suitable for opt_help and similar since it lacks prefix handling.
71  */
72 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
73 
74 /**
75  * Fallback for options that are not explicitly handled, these will be
76  * parsed through AVOptions.
77  */
78 int opt_default(void *optctx, const char *opt, const char *arg);
79 
80 /**
81  * Set the libav* libraries log level.
82  */
83 int opt_loglevel(void *optctx, const char *opt, const char *arg);
84 
85 int opt_report(const char *opt);
86 
87 int opt_max_alloc(void *optctx, const char *opt, const char *arg);
88 
89 int opt_cpuflags(void *optctx, const char *opt, const char *arg);
90 
91 int opt_codec_debug(void *optctx, const char *opt, const char *arg);
92 
93 /**
94  * Limit the execution time.
95  */
96 int opt_timelimit(void *optctx, const char *opt, const char *arg);
97 
98 /**
99  * Parse a string and return its corresponding value as a double.
100  * Exit from the application if the string cannot be correctly
101  * parsed or the corresponding value is invalid.
102  *
103  * @param context the context of the value to be set (e.g. the
104  * corresponding command line option name)
105  * @param numstr the string to be parsed
106  * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
107  * string should be parsed
108  * @param min the minimum valid accepted value
109  * @param max the maximum valid accepted value
110  */
111 double parse_number_or_die(const char *context, const char *numstr, int type,
112  double min, double max);
113 
114 /**
115  * Parse a string specifying a time and return its corresponding
116  * value as a number of microseconds. Exit from the application if
117  * the string cannot be correctly parsed.
118  *
119  * @param context the context of the value to be set (e.g. the
120  * corresponding command line option name)
121  * @param timestr the string to be parsed
122  * @param is_duration a flag which tells how to interpret timestr, if
123  * not zero timestr is interpreted as a duration, otherwise as a
124  * date
125  *
126  * @see av_parse_time()
127  */
128 int64_t parse_time_or_die(const char *context, const char *timestr,
129  int is_duration);
130 
131 typedef struct SpecifierOpt {
132  char *specifier; /**< stream/chapter/program/... specifier */
133  union {
135  int i;
136  int64_t i64;
137  float f;
138  double dbl;
139  } u;
140 } SpecifierOpt;
141 
142 typedef struct OptionDef {
143  const char *name;
144  int flags;
145 #define HAS_ARG 0x0001
146 #define OPT_BOOL 0x0002
147 #define OPT_EXPERT 0x0004
148 #define OPT_STRING 0x0008
149 #define OPT_VIDEO 0x0010
150 #define OPT_AUDIO 0x0020
151 #define OPT_INT 0x0080
152 #define OPT_FLOAT 0x0100
153 #define OPT_SUBTITLE 0x0200
154 #define OPT_INT64 0x0400
155 #define OPT_EXIT 0x0800
156 #define OPT_DATA 0x1000
157 #define OPT_PERFILE 0x2000 /* the option is per-file (currently ffmpeg-only).
158  implied by OPT_OFFSET or OPT_SPEC */
159 #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
160 #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
161  Implies OPT_OFFSET. Next element after the offset is
162  an int containing element count in the array. */
163 #define OPT_TIME 0x10000
164 #define OPT_DOUBLE 0x20000
165  union {
166  void *dst_ptr;
167  int (*func_arg)(void *, const char *, const char *);
168  size_t off;
169  } u;
170  const char *help;
171  const char *argname;
172 } OptionDef;
173 
174 /**
175  * Print help for all options matching specified flags.
176  *
177  * @param options a list of options
178  * @param msg title of this group. Only printed if at least one option matches.
179  * @param req_flags print only options which have all those flags set.
180  * @param rej_flags don't print options which have any of those flags set.
181  * @param alt_flags print only options that have at least one of those flags set
182  */
183 void show_help_options(const OptionDef *options, const char *msg, int req_flags,
184  int rej_flags, int alt_flags);
185 
186 /**
187  * Show help for all options with given flags in class and all its
188  * children.
189  */
190 void show_help_children(const AVClass *class, int flags);
191 
192 /**
193  * Per-fftool specific help handler. Implemented in each
194  * fftool, called by show_help().
195  */
196 void show_help_default(const char *opt, const char *arg);
197 
198 /**
199  * Generic -h handler common to all fftools.
200  */
201 int show_help(void *optctx, const char *opt, const char *arg);
202 
203 /**
204  * Parse the command line arguments.
205  *
206  * @param optctx an opaque options context
207  * @param argc number of command line arguments
208  * @param argv values of command line arguments
209  * @param options Array with the definitions required to interpret every
210  * option of the form: -option_name [argument]
211  * @param parse_arg_function Name of the function called to process every
212  * argument without a leading option name flag. NULL if such arguments do
213  * not have to be processed.
214  */
215 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
216  void (* parse_arg_function)(void *optctx, const char*));
217 
218 /**
219  * Parse one given option.
220  *
221  * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
222  */
223 int parse_option(void *optctx, const char *opt, const char *arg,
224  const OptionDef *options);
225 
226 /**
227  * An option extracted from the commandline.
228  * Cannot use AVDictionary because of options like -map which can be
229  * used multiple times.
230  */
231 typedef struct Option {
232  const OptionDef *opt;
233  const char *key;
234  const char *val;
235 } Option;
237 typedef struct OptionGroupDef {
238  /**< group name */
239  const char *name;
240  /**
241  * Option to be used as group separator. Can be NULL for groups which
242  * are terminated by a non-option argument (e.g. ffmpeg output files)
243  */
244  const char *sep;
247 typedef struct OptionGroup {
249  const char *arg;
250 
252  int nb_opts;
257  struct SwsContext *sws_opts;
259 } OptionGroup;
260 
261 /**
262  * A list of option groups that all have the same group type
263  * (e.g. input files or output files)
264  */
265 typedef struct OptionGroupList {
267 
271 
272 typedef struct OptionParseContext {
274 
277 
278  /* parsing state */
281 
282 /**
283  * Parse an options group and write results into optctx.
284  *
285  * @param optctx an app-specific options context. NULL for global options group
286  */
287 int parse_optgroup(void *optctx, OptionGroup *g);
288 
289 /**
290  * Split the commandline into an intermediate form convenient for further
291  * processing.
292  *
293  * The commandline is assumed to be composed of options which either belong to a
294  * group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global
295  * (everything else).
296  *
297  * A group (defined by an OptionGroupDef struct) is a sequence of options
298  * terminated by either a group separator option (e.g. -i) or a parameter that
299  * is not an option (doesn't start with -). A group without a separator option
300  * must always be first in the supplied groups list.
301  *
302  * All options within the same group are stored in one OptionGroup struct in an
303  * OptionGroupList, all groups with the same group definition are stored in one
304  * OptionGroupList in OptionParseContext.groups. The order of group lists is the
305  * same as the order of group definitions.
306  */
307 int split_commandline(OptionParseContext *octx, int argc, char *argv[],
308  const OptionDef *options,
309  const OptionGroupDef *groups, int nb_groups);
310 
311 /**
312  * Free all allocated memory in an OptionParseContext.
313  */
315 
316 /**
317  * Find the '-loglevel' option in the command line args and apply it.
318  */
319 void parse_loglevel(int argc, char **argv, const OptionDef *options);
320 
321 /**
322  * Return index of option opt in argv or 0 if not found.
323  */
324 int locate_option(int argc, char **argv, const OptionDef *options,
325  const char *optname);
326 
327 /**
328  * Check if the given stream matches a stream specifier.
329  *
330  * @param s Corresponding format context.
331  * @param st Stream from s to be checked.
332  * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
333  *
334  * @return 1 if the stream matches, 0 if it doesn't, <0 on error
335  */
336 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
337 
338 /**
339  * Filter out options for given codec.
340  *
341  * Create a new options dictionary containing only the options from
342  * opts which apply to the codec with ID codec_id.
343  *
344  * @param opts dictionary to place options in
345  * @param codec_id ID of the codec that should be filtered for
346  * @param s Corresponding format context.
347  * @param st A stream from s for which the options should be filtered.
348  * @param codec The particular codec for which the options should be filtered.
349  * If null, the default one is looked up according to the codec id.
350  * @return a pointer to the created dictionary
351  */
353  AVFormatContext *s, AVStream *st, AVCodec *codec);
354 
355 /**
356  * Setup AVCodecContext options for avformat_find_stream_info().
357  *
358  * Create an array of dictionaries, one dictionary for each stream
359  * contained in s.
360  * Each dictionary will contain the options from codec_opts which can
361  * be applied to the corresponding stream codec context.
362  *
363  * @return pointer to the created array of dictionaries, NULL if it
364  * cannot be created
365  */
367  AVDictionary *codec_opts);
368 
369 /**
370  * Print an error message to stderr, indicating filename and a human
371  * readable description of the error code err.
372  *
373  * If strerror_r() is not available the use of this function in a
374  * multithreaded application may be unsafe.
375  *
376  * @see av_strerror()
377  */
378 void print_error(const char *filename, int err);
379 
380 /**
381  * Print the program banner to stderr. The banner contents depend on the
382  * current version of the repository and of the libav* libraries used by
383  * the program.
384  */
385 void show_banner(int argc, char **argv, const OptionDef *options);
386 
387 /**
388  * Print the version of the program to stdout. The version message
389  * depends on the current versions of the repository and of the libav*
390  * libraries.
391  * This option processing function does not utilize the arguments.
392  */
393 int show_version(void *optctx, const char *opt, const char *arg);
394 
395 /**
396  * Print the license of the program to stdout. The license depends on
397  * the license of the libraries compiled into the program.
398  * This option processing function does not utilize the arguments.
399  */
400 int show_license(void *optctx, const char *opt, const char *arg);
401 
402 /**
403  * Print a listing containing all the formats supported by the
404  * program.
405  * This option processing function does not utilize the arguments.
406  */
407 int show_formats(void *optctx, const char *opt, const char *arg);
408 
409 /**
410  * Print a listing containing all the codecs supported by the
411  * program.
412  * This option processing function does not utilize the arguments.
413  */
414 int show_codecs(void *optctx, const char *opt, const char *arg);
415 
416 /**
417  * Print a listing containing all the decoders supported by the
418  * program.
419  */
420 int show_decoders(void *optctx, const char *opt, const char *arg);
421 
422 /**
423  * Print a listing containing all the encoders supported by the
424  * program.
425  */
426 int show_encoders(void *optctx, const char *opt, const char *arg);
427 
428 /**
429  * Print a listing containing all the filters supported by the
430  * program.
431  * This option processing function does not utilize the arguments.
432  */
433 int show_filters(void *optctx, const char *opt, const char *arg);
434 
435 /**
436  * Print a listing containing all the bit stream filters supported by the
437  * program.
438  * This option processing function does not utilize the arguments.
439  */
440 int show_bsfs(void *optctx, const char *opt, const char *arg);
441 
442 /**
443  * Print a listing containing all the protocols supported by the
444  * program.
445  * This option processing function does not utilize the arguments.
446  */
447 int show_protocols(void *optctx, const char *opt, const char *arg);
448 
449 /**
450  * Print a listing containing all the pixel formats supported by the
451  * program.
452  * This option processing function does not utilize the arguments.
453  */
454 int show_pix_fmts(void *optctx, const char *opt, const char *arg);
455 
456 /**
457  * Print a listing containing all the standard channel layouts supported by
458  * the program.
459  * This option processing function does not utilize the arguments.
460  */
461 int show_layouts(void *optctx, const char *opt, const char *arg);
462 
463 /**
464  * Print a listing containing all the sample formats supported by the
465  * program.
466  */
467 int show_sample_fmts(void *optctx, const char *opt, const char *arg);
468 
469 /**
470  * Return a positive value if a line read from standard input
471  * starts with [yY], otherwise return 0.
472  */
473 int read_yesno(void);
474 
475 /**
476  * Read the file with name filename, and put its content in a newly
477  * allocated 0-terminated buffer.
478  *
479  * @param filename file to read from
480  * @param bufptr location where pointer to buffer is returned
481  * @param size location where size of buffer is returned
482  * @return 0 in case of success, a negative value corresponding to an
483  * AVERROR error code in case of failure.
484  */
485 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
486 
487 /**
488  * Get a file corresponding to a preset file.
489  *
490  * If is_path is non-zero, look for the file in the path preset_name.
491  * Otherwise search for a file named arg.ffpreset in the directories
492  * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
493  * at configuration time or in a "ffpresets" folder along the executable
494  * on win32, in that order. If no such file is found and
495  * codec_name is defined, then search for a file named
496  * codec_name-preset_name.avpreset in the above-mentioned directories.
497  *
498  * @param filename buffer where the name of the found filename is written
499  * @param filename_size size in bytes of the filename buffer
500  * @param preset_name name of the preset to search
501  * @param is_path tell if preset_name is a filename path
502  * @param codec_name name of the codec for which to look for the
503  * preset, may be NULL
504  */
505 FILE *get_preset_file(char *filename, size_t filename_size,
506  const char *preset_name, int is_path, const char *codec_name);
507 
508 /**
509  * Realloc array to hold new_size elements of elem_size.
510  * Calls exit() on failure.
511  *
512  * @param array array to reallocate
513  * @param elem_size size in bytes of each element
514  * @param size new element count will be written here
515  * @param new_size number of elements to place in reallocated array
516  * @return reallocated array
517  */
518 void *grow_array(void *array, int elem_size, int *size, int new_size);
519 
520 #define GROW_ARRAY(array, nb_elems)\
521  array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1)
523 typedef struct FrameBuffer {
524  uint8_t *base[4];
526  int linesize[4];
527 
528  int h, w;
531  int refcount;
532  struct FrameBuffer **pool; ///< head of the buffer pool
533  struct FrameBuffer *next;
534 } FrameBuffer;
535 
536 /**
537  * Get a frame from the pool. This is intended to be used as a callback for
538  * AVCodecContext.get_buffer.
539  *
540  * @param s codec context. s->opaque must be a pointer to the head of the
541  * buffer pool.
542  * @param frame frame->opaque will be set to point to the FrameBuffer
543  * containing the frame data.
544  */
546 
547 /**
548  * A callback to be used for AVCodecContext.release_buffer along with
549  * codec_get_buffer().
550  */
552 
553 /**
554  * A callback to be used for AVFilterBuffer.free.
555  * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer
556  * containing the buffer data.
557  */
559 
560 /**
561  * Free all the buffers in the pool. This must be called after all the
562  * buffers have been released.
563  */
565 
566 #define GET_PIX_FMT_NAME(pix_fmt)\
567  const char *name = av_get_pix_fmt_name(pix_fmt);
568 
569 #define GET_SAMPLE_FMT_NAME(sample_fmt)\
570  const char *name = av_get_sample_fmt_name(sample_fmt)
571 
572 #define GET_SAMPLE_RATE_NAME(rate)\
573  char name[16];\
574  snprintf(name, sizeof(name), "%d", rate);
575 
576 #define GET_CH_LAYOUT_NAME(ch_layout)\
577  char name[16];\
578  snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
579 
580 #define GET_CH_LAYOUT_DESC(ch_layout)\
581  char name[128];\
582  av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
583 
584 #endif /* CMDUTILS_H */