cmdutils: split parse_option().
[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;
8c8eab8b 45extern AVDictionary *format_opts, *codec_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/**
da9cea77 209 * Find the '-loglevel' option in the command line args and apply it.
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210 */
211void parse_loglevel(int argc, char **argv, const OptionDef *options);
212
213/**
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214 * Return index of option opt in argv or 0 if not found.
215 */
216int locate_option(int argc, char **argv, const OptionDef *options,
217 const char *optname);
218
219/**
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220 * Check if the given stream matches a stream specifier.
221 *
222 * @param s Corresponding format context.
223 * @param st Stream from s to be checked.
e873c03a 224 * @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form.
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225 *
226 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
227 */
228int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
229
230/**
8c8eab8b 231 * Filter out options for given codec.
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232 *
233 * Create a new options dictionary containing only the options from
234 * opts which apply to the codec with ID codec_id.
235 *
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236 * @param opts dictionary to place options in
237 * @param codec_id ID of the codec that should be filtered for
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238 * @param s Corresponding format context.
239 * @param st A stream from s for which the options should be filtered.
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240 * @param codec The particular codec for which the options should be filtered.
241 * If null, the default one is looked up according to the codec id.
ce23ca81 242 * @return a pointer to the created dictionary
8c8eab8b 243 */
36ef5369 244AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
d3ed1c95 245 AVFormatContext *s, AVStream *st, AVCodec *codec);
8c8eab8b 246
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247/**
248 * Setup AVCodecContext options for avformat_find_stream_info().
249 *
250 * Create an array of dictionaries, one dictionary for each stream
251 * contained in s.
252 * Each dictionary will contain the options from codec_opts which can
253 * be applied to the corresponding stream codec context.
254 *
255 * @return pointer to the created array of dictionaries, NULL if it
256 * cannot be created
3009f521 257 */
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258AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
259 AVDictionary *codec_opts);
3009f521 260
8c8eab8b 261/**
49bd8e4b 262 * Print an error message to stderr, indicating filename and a human
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263 * readable description of the error code err.
264 *
265 * If strerror_r() is not available the use of this function in a
266 * multithreaded application may be unsafe.
267 *
268 * @see av_strerror()
269 */
01310af2 270void print_error(const char *filename, int err);
c5dc6026 271
f35917b2 272/**
49bd8e4b 273 * Print the program banner to stderr. The banner contents depend on the
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274 * current version of the repository and of the libav* libraries used by
275 * the program.
86074ed1 276 */
ea9c581f 277void show_banner(void);
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278
279/**
49bd8e4b 280 * Print the version of the program to stdout. The version message
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281 * depends on the current versions of the repository and of the libav*
282 * libraries.
86074ed1 283 */
11d957fb 284int show_version(void *optctx, const char *opt, const char *arg);
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285
286/**
49bd8e4b 287 * Print the license of the program to stdout. The license depends on
15067504 288 * the license of the libraries compiled into the program.
f35917b2 289 */
11d957fb 290int show_license(void *optctx, const char *opt, const char *arg);
f35917b2 291
ba9880c1 292/**
49bd8e4b 293 * Print a listing containing all the formats supported by the
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294 * program.
295 */
11d957fb 296int show_formats(void *optctx, const char *opt, const char *arg);
ba9880c1 297
090b61b2 298/**
49bd8e4b 299 * Print a listing containing all the codecs supported by the
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300 * program.
301 */
11d957fb 302int show_codecs(void *optctx, const char *opt, const char *arg);
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303
304/**
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305 * Print a listing containing all the decoders supported by the
306 * program.
307 */
11d957fb 308int show_decoders(void *optctx, const char *opt, const char *arg);
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309
310/**
311 * Print a listing containing all the encoders supported by the
312 * program.
313 */
11d957fb 314int show_encoders(void *optctx, const char *opt, const char *arg);
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315
316/**
49bd8e4b 317 * Print a listing containing all the filters supported by the
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318 * program.
319 */
11d957fb 320int show_filters(void *optctx, const char *opt, const char *arg);
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321
322/**
49bd8e4b 323 * Print a listing containing all the bit stream filters supported by the
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324 * program.
325 */
11d957fb 326int show_bsfs(void *optctx, const char *opt, const char *arg);
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327
328/**
49bd8e4b 329 * Print a listing containing all the protocols supported by the
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330 * program.
331 */
11d957fb 332int show_protocols(void *optctx, const char *opt, const char *arg);
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333
334/**
49bd8e4b 335 * Print a listing containing all the pixel formats supported by the
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336 * program.
337 */
11d957fb 338int show_pix_fmts(void *optctx, const char *opt, const char *arg);
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339
340/**
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341 * Print a listing containing all the sample formats supported by the
342 * program.
343 */
11d957fb 344int show_sample_fmts(void *optctx, const char *opt, const char *arg);
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345
346/**
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347 * Return a positive value if a line read from standard input
348 * starts with [yY], otherwise return 0.
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349 */
350int read_yesno(void);
351
458b062d 352/**
49bd8e4b 353 * Read the file with name filename, and put its content in a newly
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354 * allocated 0-terminated buffer.
355 *
02e42751 356 * @param filename file to read from
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357 * @param bufptr location where pointer to buffer is returned
358 * @param size location where size of buffer is returned
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359 * @return 0 in case of success, a negative value corresponding to an
360 * AVERROR error code in case of failure.
361 */
02170990 362int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
458b062d 363
e4cbf752 364typedef struct PtsCorrectionContext {
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365 int64_t num_faulty_pts; /// Number of incorrect PTS values so far
366 int64_t num_faulty_dts; /// Number of incorrect DTS values so far
367 int64_t last_pts; /// PTS of the last frame
368 int64_t last_dts; /// DTS of the last frame
369} PtsCorrectionContext;
370
371/**
f03f30d7 372 * Reset the state of the PtsCorrectionContext.
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373 */
374void init_pts_correction(PtsCorrectionContext *ctx);
375
376/**
f03f30d7 377 * Attempt to guess proper monotonic timestamps for decoded video frames
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378 * which might have incorrect times. Input timestamps may wrap around, in
379 * which case the output will as well.
380 *
02e42751 381 * @param ctx the PtsCorrectionContext carrying stream pts information
f03f30d7 382 * @param pts the pts field of the decoded AVPacket, as passed through
7a8bfa5d 383 * AVCodecContext.reordered_opaque
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384 * @param dts the dts field of the decoded AVPacket
385 * @return one of the input values, may be AV_NOPTS_VALUE
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386 */
387int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
388
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389/**
390 * Get a file corresponding to a preset file.
391 *
392 * If is_path is non-zero, look for the file in the path preset_name.
050dc127 393 * Otherwise search for a file named arg.avpreset in the directories
25c27f37 394 * $AVCONV_DATADIR (if set), $HOME/.avconv, and in the datadir defined
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395 * at configuration time, in that order. If no such file is found and
396 * codec_name is defined, then search for a file named
050dc127 397 * codec_name-preset_name.avpreset in the above-mentioned directories.
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398 *
399 * @param filename buffer where the name of the found filename is written
400 * @param filename_size size in bytes of the filename buffer
401 * @param preset_name name of the preset to search
402 * @param is_path tell if preset_name is a filename path
403 * @param codec_name name of the codec for which to look for the
404 * preset, may be NULL
405 */
406FILE *get_preset_file(char *filename, size_t filename_size,
407 const char *preset_name, int is_path, const char *codec_name);
408
dad09ff9 409/**
cac651c8 410 * Realloc array to hold new_size elements of elem_size.
5e3f9979 411 * Calls exit() on failure.
cac651c8 412 *
02e42751 413 * @param array array to reallocate
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414 * @param elem_size size in bytes of each element
415 * @param size new element count will be written here
02e42751 416 * @param new_size number of elements to place in reallocated array
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417 * @return reallocated array
418 */
419void *grow_array(void *array, int elem_size, int *size, int new_size);
420
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421#define GROW_ARRAY(array, nb_elems)\
422 array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1)
423
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424typedef struct FrameBuffer {
425 uint8_t *base[4];
426 uint8_t *data[4];
427 int linesize[4];
428
429 int h, w;
716d413c 430 enum AVPixelFormat pix_fmt;
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431
432 int refcount;
433 struct FrameBuffer **pool; ///< head of the buffer pool
434 struct FrameBuffer *next;
435} FrameBuffer;
436
437/**
438 * Get a frame from the pool. This is intended to be used as a callback for
439 * AVCodecContext.get_buffer.
440 *
441 * @param s codec context. s->opaque must be a pointer to the head of the
442 * buffer pool.
443 * @param frame frame->opaque will be set to point to the FrameBuffer
444 * containing the frame data.
445 */
446int codec_get_buffer(AVCodecContext *s, AVFrame *frame);
447
448/**
449 * A callback to be used for AVCodecContext.release_buffer along with
450 * codec_get_buffer().
451 */
452void codec_release_buffer(AVCodecContext *s, AVFrame *frame);
453
454/**
455 * A callback to be used for AVFilterBuffer.free.
456 * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer
457 * containing the buffer data.
458 */
459void filter_release_buffer(AVFilterBuffer *fb);
460
461/**
462 * Free all the buffers in the pool. This must be called after all the
463 * buffers have been released.
464 */
465void free_buffer_pool(FrameBuffer **pool);
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466
467#define GET_PIX_FMT_NAME(pix_fmt)\
468 const char *name = av_get_pix_fmt_name(pix_fmt);
469
470#define GET_SAMPLE_FMT_NAME(sample_fmt)\
471 const char *name = av_get_sample_fmt_name(sample_fmt)
472
473#define GET_SAMPLE_RATE_NAME(rate)\
474 char name[16];\
475 snprintf(name, sizeof(name), "%d", rate);
476
477#define GET_CH_LAYOUT_NAME(ch_layout)\
478 char name[16];\
479 snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
480
481#define GET_CH_LAYOUT_DESC(ch_layout)\
482 char name[128];\
483 av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
484
153382e1 485#endif /* LIBAV_CMDUTILS_H */