atomic: Check for __sync_val_compare_and_swap instead of __sync_synchronize
[libav.git] / cmdutils.h
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1/*
2 * Various utilities for command line tools
3 * copyright (c) 2003 Fabrice Bellard
4 *
2912e87a 5 * This file is part of Libav.
f5a90186 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
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22#ifndef LIBAV_CMDUTILS_H
23#define LIBAV_CMDUTILS_H
01310af2 24
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25#include <stdint.h>
26
95137bbb 27#include "libavcodec/avcodec.h"
ea91e771 28#include "libavfilter/avfilter.h"
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29#include "libavformat/avformat.h"
30#include "libswscale/swscale.h"
f0a838e5 31
60b5a745 32/**
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33 * program name, defined by the program for show_version().
34 */
35extern const char program_name[];
36
37/**
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38 * program birth year, defined by the program for show_banner()
39 */
40extern const int program_birth_year;
41
72415b2a 42extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
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43extern AVFormatContext *avformat_opts;
44extern struct SwsContext *sws_opts;
5c7db097 45extern AVDictionary *format_opts, *codec_opts, *resample_opts;
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46
47/**
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48 * Initialize the cmdutils option system, in particular
49 * allocate the *_opts contexts.
50 */
51void init_opts(void);
52/**
53 * Uninitialize the cmdutils option system, in particular
54 * free the *_opts contexts and their contents.
55 */
56void uninit_opts(void);
57
58/**
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59 * Trivial log callback.
60 * Only suitable for show_help and similar since it lacks prefix handling.
61 */
62void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
63
64/**
b7438896 65 * Fallback for options that are not explicitly handled, these will be
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66 * parsed through AVOptions.
67 */
11d957fb 68int opt_default(void *optctx, const char *opt, const char *arg);
85663ef3 69
ea9c581f 70/**
49bd8e4b 71 * Set the libav* libraries log level.
4c97a6fa 72 */
11d957fb 73int opt_loglevel(void *optctx, const char *opt, const char *arg);
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74
75/**
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76 * Limit the execution time.
77 */
11d957fb 78int opt_timelimit(void *optctx, const char *opt, const char *arg);
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79
80/**
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81 * Parse a string and return its corresponding value as a double.
82 * Exit from the application if the string cannot be correctly
15067504 83 * parsed or the corresponding value is invalid.
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84 *
85 * @param context the context of the value to be set (e.g. the
da9cea77 86 * corresponding command line option name)
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87 * @param numstr the string to be parsed
88 * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
89 * string should be parsed
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90 * @param min the minimum valid accepted value
91 * @param max the maximum valid accepted value
60b5a745 92 */
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93double parse_number_or_die(const char *context, const char *numstr, int type,
94 double min, double max);
60b5a745 95
7542157d 96/**
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97 * Parse a string specifying a time and return its corresponding
98 * value as a number of microseconds. Exit from the application if
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99 * the string cannot be correctly parsed.
100 *
101 * @param context the context of the value to be set (e.g. the
da9cea77 102 * corresponding command line option name)
7542157d 103 * @param timestr the string to be parsed
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104 * @param is_duration a flag which tells how to interpret timestr, if
105 * not zero timestr is interpreted as a duration, otherwise as a
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106 * date
107 *
748061de 108 * @see parse_date()
7542157d 109 */
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110int64_t parse_time_or_die(const char *context, const char *timestr,
111 int is_duration);
7542157d 112
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113typedef struct SpecifierOpt {
114 char *specifier; /**< stream/chapter/program/... specifier */
115 union {
116 uint8_t *str;
117 int i;
118 int64_t i64;
119 float f;
33f75d72 120 double dbl;
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121 } u;
122} SpecifierOpt;
123
e4cbf752 124typedef struct OptionDef {
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125 const char *name;
126 int flags;
127#define HAS_ARG 0x0001
128#define OPT_BOOL 0x0002
129#define OPT_EXPERT 0x0004
130#define OPT_STRING 0x0008
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131#define OPT_VIDEO 0x0010
132#define OPT_AUDIO 0x0020
26d4f26b 133#define OPT_INT 0x0080
394c4d77 134#define OPT_FLOAT 0x0100
ae27975d 135#define OPT_SUBTITLE 0x0200
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136#define OPT_INT64 0x0400
137#define OPT_EXIT 0x0800
138#define OPT_DATA 0x1000
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139#define OPT_PERFILE 0x2000 /* the option is per-file (currently avconv-only).
140 implied by OPT_OFFSET or OPT_SPEC */
7cc8d638 141#define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
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142#define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
143 Implies OPT_OFFSET. Next element after the offset is
144 an int containing element count in the array. */
6b779ccc 145#define OPT_TIME 0x10000
33f75d72 146#define OPT_DOUBLE 0x20000
ae27975d 147 union {
7efe05ab 148 void *dst_ptr;
11d957fb 149 int (*func_arg)(void *, const char *, const char *);
7cc8d638 150 size_t off;
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151 } u;
152 const char *help;
153 const char *argname;
154} OptionDef;
155
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156/**
157 * Print help for all options matching specified flags.
158 *
159 * @param options a list of options
160 * @param msg title of this group. Only printed if at least one option matches.
161 * @param req_flags print only options which have all those flags set.
162 * @param rej_flags don't print options which have any of those flags set.
f9fada27 163 * @param alt_flags print only options that have at least one of those flags set
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164 */
165void show_help_options(const OptionDef *options, const char *msg, int req_flags,
f9fada27 166 int rej_flags, int alt_flags);
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167
168/**
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169 * Show help for all options with given flags in class and all its
170 * children.
171 */
172void show_help_children(const AVClass *class, int flags);
173
174/**
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175 * Per-avtool specific help handler. Implemented in each
176 * avtool, called by show_help().
177 */
178void show_help_default(const char *opt, const char *arg);
179
180/**
181 * Generic -h handler common to all avtools.
182 */
11d957fb 183int show_help(void *optctx, const char *opt, const char *arg);
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184
185/**
49bd8e4b 186 * Parse the command line arguments.
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187 *
188 * @param optctx an opaque options context
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189 * @param argc number of command line arguments
190 * @param argv values of command line arguments
60a9966e 191 * @param options Array with the definitions required to interpret every
0baf34d8 192 * option of the form: -option_name [argument]
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193 * @param parse_arg_function Name of the function called to process every
194 * argument without a leading option name flag. NULL if such arguments do
195 * not have to be processed.
196 */
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197void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
198 void (* parse_arg_function)(void *optctx, const char*));
60a9966e 199
8d787f8e 200/**
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201 * Parse one given option.
202 *
203 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
204 */
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205int parse_option(void *optctx, const char *opt, const char *arg,
206 const OptionDef *options);
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207
208/**
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209 * An option extracted from the commandline.
210 * Cannot use AVDictionary because of options like -map which can be
211 * used multiple times.
212 */
213typedef struct Option {
214 const OptionDef *opt;
215 const char *key;
216 const char *val;
217} Option;
218
219typedef struct OptionGroupDef {
220 /**< group name */
221 const char *name;
222 /**
223 * Option to be used as group separator. Can be NULL for groups which
224 * are terminated by a non-option argument (e.g. avconv output files)
225 */
226 const char *sep;
227} OptionGroupDef;
228
229typedef struct OptionGroup {
230 const OptionGroupDef *group_def;
231 const char *arg;
232
233 Option *opts;
234 int nb_opts;
235
236 AVDictionary *codec_opts;
237 AVDictionary *format_opts;
5c7db097 238 AVDictionary *resample_opts;
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239 struct SwsContext *sws_opts;
240} OptionGroup;
241
242/**
243 * A list of option groups that all have the same group type
244 * (e.g. input files or output files)
245 */
246typedef struct OptionGroupList {
247 const OptionGroupDef *group_def;
248
249 OptionGroup *groups;
250 int nb_groups;
251} OptionGroupList;
252
253typedef struct OptionParseContext {
254 OptionGroup global_opts;
255
256 OptionGroupList *groups;
257 int nb_groups;
258
259 /* parsing state */
260 OptionGroup cur_group;
261} OptionParseContext;
262
263/**
264 * Parse an options group and write results into optctx.
265 *
266 * @param optctx an app-specific options context. NULL for global options group
267 */
268int parse_optgroup(void *optctx, OptionGroup *g);
269
270/**
271 * Split the commandline into an intermediate form convenient for further
272 * processing.
273 *
274 * The commandline is assumed to be composed of options which either belong to a
275 * group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global
276 * (everything else).
277 *
278 * A group (defined by an OptionGroupDef struct) is a sequence of options
279 * terminated by either a group separator option (e.g. -i) or a parameter that
280 * is not an option (doesn't start with -). A group without a separator option
281 * must always be first in the supplied groups list.
282 *
283 * All options within the same group are stored in one OptionGroup struct in an
284 * OptionGroupList, all groups with the same group definition are stored in one
285 * OptionGroupList in OptionParseContext.groups. The order of group lists is the
286 * same as the order of group definitions.
287 */
288int split_commandline(OptionParseContext *octx, int argc, char *argv[],
289 const OptionDef *options,
c661cb66 290 const OptionGroupDef *groups, int nb_groups);
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291
292/**
293 * Free all allocated memory in an OptionParseContext.
294 */
295void uninit_parse_context(OptionParseContext *octx);
296
297/**
da9cea77 298 * Find the '-loglevel' option in the command line args and apply it.
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299 */
300void parse_loglevel(int argc, char **argv, const OptionDef *options);
301
302/**
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303 * Return index of option opt in argv or 0 if not found.
304 */
305int locate_option(int argc, char **argv, const OptionDef *options,
306 const char *optname);
307
308/**
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309 * Check if the given stream matches a stream specifier.
310 *
311 * @param s Corresponding format context.
312 * @param st Stream from s to be checked.
e873c03a 313 * @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form.
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314 *
315 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
316 */
317int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
318
319/**
8c8eab8b 320 * Filter out options for given codec.
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321 *
322 * Create a new options dictionary containing only the options from
323 * opts which apply to the codec with ID codec_id.
324 *
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325 * @param opts dictionary to place options in
326 * @param codec_id ID of the codec that should be filtered for
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327 * @param s Corresponding format context.
328 * @param st A stream from s for which the options should be filtered.
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329 * @param codec The particular codec for which the options should be filtered.
330 * If null, the default one is looked up according to the codec id.
ce23ca81 331 * @return a pointer to the created dictionary
8c8eab8b 332 */
36ef5369 333AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
d3ed1c95 334 AVFormatContext *s, AVStream *st, AVCodec *codec);
8c8eab8b 335
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336/**
337 * Setup AVCodecContext options for avformat_find_stream_info().
338 *
339 * Create an array of dictionaries, one dictionary for each stream
340 * contained in s.
341 * Each dictionary will contain the options from codec_opts which can
342 * be applied to the corresponding stream codec context.
343 *
344 * @return pointer to the created array of dictionaries, NULL if it
345 * cannot be created
3009f521 346 */
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347AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
348 AVDictionary *codec_opts);
3009f521 349
8c8eab8b 350/**
49bd8e4b 351 * Print an error message to stderr, indicating filename and a human
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352 * readable description of the error code err.
353 *
354 * If strerror_r() is not available the use of this function in a
355 * multithreaded application may be unsafe.
356 *
357 * @see av_strerror()
358 */
01310af2 359void print_error(const char *filename, int err);
c5dc6026 360
f35917b2 361/**
49bd8e4b 362 * Print the program banner to stderr. The banner contents depend on the
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363 * current version of the repository and of the libav* libraries used by
364 * the program.
86074ed1 365 */
ea9c581f 366void show_banner(void);
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367
368/**
49bd8e4b 369 * Print the version of the program to stdout. The version message
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370 * depends on the current versions of the repository and of the libav*
371 * libraries.
86074ed1 372 */
11d957fb 373int show_version(void *optctx, const char *opt, const char *arg);
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374
375/**
49bd8e4b 376 * Print the license of the program to stdout. The license depends on
15067504 377 * the license of the libraries compiled into the program.
f35917b2 378 */
11d957fb 379int show_license(void *optctx, const char *opt, const char *arg);
f35917b2 380
ba9880c1 381/**
49bd8e4b 382 * Print a listing containing all the formats supported by the
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383 * program.
384 */
11d957fb 385int show_formats(void *optctx, const char *opt, const char *arg);
ba9880c1 386
090b61b2 387/**
49bd8e4b 388 * Print a listing containing all the codecs supported by the
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389 * program.
390 */
11d957fb 391int show_codecs(void *optctx, const char *opt, const char *arg);
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392
393/**
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394 * Print a listing containing all the decoders supported by the
395 * program.
396 */
11d957fb 397int show_decoders(void *optctx, const char *opt, const char *arg);
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398
399/**
400 * Print a listing containing all the encoders supported by the
401 * program.
402 */
11d957fb 403int show_encoders(void *optctx, const char *opt, const char *arg);
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404
405/**
49bd8e4b 406 * Print a listing containing all the filters supported by the
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407 * program.
408 */
11d957fb 409int show_filters(void *optctx, const char *opt, const char *arg);
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410
411/**
49bd8e4b 412 * Print a listing containing all the bit stream filters supported by the
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413 * program.
414 */
11d957fb 415int show_bsfs(void *optctx, const char *opt, const char *arg);
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416
417/**
49bd8e4b 418 * Print a listing containing all the protocols supported by the
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419 * program.
420 */
11d957fb 421int show_protocols(void *optctx, const char *opt, const char *arg);
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422
423/**
49bd8e4b 424 * Print a listing containing all the pixel formats supported by the
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425 * program.
426 */
11d957fb 427int show_pix_fmts(void *optctx, const char *opt, const char *arg);
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428
429/**
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430 * Print a listing containing all the sample formats supported by the
431 * program.
432 */
11d957fb 433int show_sample_fmts(void *optctx, const char *opt, const char *arg);
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434
435/**
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436 * Return a positive value if a line read from standard input
437 * starts with [yY], otherwise return 0.
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438 */
439int read_yesno(void);
440
458b062d 441/**
49bd8e4b 442 * Read the file with name filename, and put its content in a newly
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443 * allocated 0-terminated buffer.
444 *
02e42751 445 * @param filename file to read from
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446 * @param bufptr location where pointer to buffer is returned
447 * @param size location where size of buffer is returned
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448 * @return 0 in case of success, a negative value corresponding to an
449 * AVERROR error code in case of failure.
450 */
02170990 451int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
458b062d 452
e4cbf752 453typedef struct PtsCorrectionContext {
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454 int64_t num_faulty_pts; /// Number of incorrect PTS values so far
455 int64_t num_faulty_dts; /// Number of incorrect DTS values so far
456 int64_t last_pts; /// PTS of the last frame
457 int64_t last_dts; /// DTS of the last frame
458} PtsCorrectionContext;
459
460/**
f03f30d7 461 * Reset the state of the PtsCorrectionContext.
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462 */
463void init_pts_correction(PtsCorrectionContext *ctx);
464
465/**
f03f30d7 466 * Attempt to guess proper monotonic timestamps for decoded video frames
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467 * which might have incorrect times. Input timestamps may wrap around, in
468 * which case the output will as well.
469 *
02e42751 470 * @param ctx the PtsCorrectionContext carrying stream pts information
f03f30d7 471 * @param pts the pts field of the decoded AVPacket, as passed through
7a8bfa5d 472 * AVCodecContext.reordered_opaque
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473 * @param dts the dts field of the decoded AVPacket
474 * @return one of the input values, may be AV_NOPTS_VALUE
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475 */
476int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
477
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478/**
479 * Get a file corresponding to a preset file.
480 *
481 * If is_path is non-zero, look for the file in the path preset_name.
050dc127 482 * Otherwise search for a file named arg.avpreset in the directories
25c27f37 483 * $AVCONV_DATADIR (if set), $HOME/.avconv, and in the datadir defined
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484 * at configuration time, in that order. If no such file is found and
485 * codec_name is defined, then search for a file named
050dc127 486 * codec_name-preset_name.avpreset in the above-mentioned directories.
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487 *
488 * @param filename buffer where the name of the found filename is written
489 * @param filename_size size in bytes of the filename buffer
490 * @param preset_name name of the preset to search
491 * @param is_path tell if preset_name is a filename path
492 * @param codec_name name of the codec for which to look for the
493 * preset, may be NULL
494 */
495FILE *get_preset_file(char *filename, size_t filename_size,
496 const char *preset_name, int is_path, const char *codec_name);
497
dad09ff9 498/**
cac651c8 499 * Realloc array to hold new_size elements of elem_size.
5e3f9979 500 * Calls exit() on failure.
cac651c8 501 *
02e42751 502 * @param array array to reallocate
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503 * @param elem_size size in bytes of each element
504 * @param size new element count will be written here
02e42751 505 * @param new_size number of elements to place in reallocated array
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506 * @return reallocated array
507 */
508void *grow_array(void *array, int elem_size, int *size, int new_size);
509
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510#define GROW_ARRAY(array, nb_elems)\
511 array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1)
512
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513#define GET_PIX_FMT_NAME(pix_fmt)\
514 const char *name = av_get_pix_fmt_name(pix_fmt);
515
516#define GET_SAMPLE_FMT_NAME(sample_fmt)\
517 const char *name = av_get_sample_fmt_name(sample_fmt)
518
519#define GET_SAMPLE_RATE_NAME(rate)\
520 char name[16];\
521 snprintf(name, sizeof(name), "%d", rate);
522
523#define GET_CH_LAYOUT_NAME(ch_layout)\
524 char name[16];\
525 snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
526
527#define GET_CH_LAYOUT_DESC(ch_layout)\
528 char name[128];\
529 av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
530
153382e1 531#endif /* LIBAV_CMDUTILS_H */