os_support: Add fallback definitions for stat flags
[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 */
68int opt_default(const char *opt, const char *arg);
69
ea9c581f 70/**
49bd8e4b 71 * Set the libav* libraries log level.
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72 */
73int opt_loglevel(const char *opt, const char *arg);
74
75/**
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76 * Limit the execution time.
77 */
78int opt_timelimit(const char *opt, const char *arg);
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
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124typedef struct {
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
133#define OPT_GRAB 0x0040
26d4f26b 134#define OPT_INT 0x0080
394c4d77 135#define OPT_FLOAT 0x0100
ae27975d 136#define OPT_SUBTITLE 0x0200
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137#define OPT_INT64 0x0400
138#define OPT_EXIT 0x0800
139#define OPT_DATA 0x1000
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140#define OPT_FUNC2 0x2000
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;
26513856 149 int (*func_arg)(const char *, const char *);
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150 int (*func2_arg)(void *, const char *, const char *);
151 size_t off;
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152 } u;
153 const char *help;
154 const char *argname;
155} OptionDef;
156
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157void show_help_options(const OptionDef *options, const char *msg, int mask,
158 int value);
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159
160/**
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161 * Show help for all options with given flags in class and all its
162 * children.
163 */
164void show_help_children(const AVClass *class, int flags);
165
166/**
49bd8e4b 167 * Parse the command line arguments.
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168 *
169 * @param optctx an opaque options context
60a9966e 170 * @param options Array with the definitions required to interpret every
0baf34d8 171 * option of the form: -option_name [argument]
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172 * @param parse_arg_function Name of the function called to process every
173 * argument without a leading option name flag. NULL if such arguments do
174 * not have to be processed.
175 */
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176void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
177 void (* parse_arg_function)(void *optctx, const char*));
60a9966e 178
8d787f8e 179/**
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180 * Parse one given option.
181 *
182 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
183 */
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184int parse_option(void *optctx, const char *opt, const char *arg,
185 const OptionDef *options);
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186
187/**
da9cea77 188 * Find the '-loglevel' option in the command line args and apply it.
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189 */
190void parse_loglevel(int argc, char **argv, const OptionDef *options);
191
192/**
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193 * Return index of option opt in argv or 0 if not found.
194 */
195int locate_option(int argc, char **argv, const OptionDef *options,
196 const char *optname);
197
198/**
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199 * Check if the given stream matches a stream specifier.
200 *
201 * @param s Corresponding format context.
202 * @param st Stream from s to be checked.
e873c03a 203 * @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form.
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204 *
205 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
206 */
207int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
208
209/**
8c8eab8b 210 * Filter out options for given codec.
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211 *
212 * Create a new options dictionary containing only the options from
213 * opts which apply to the codec with ID codec_id.
214 *
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215 * @param s Corresponding format context.
216 * @param st A stream from s for which the options should be filtered.
ce23ca81 217 * @return a pointer to the created dictionary
8c8eab8b 218 */
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219AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id,
220 AVFormatContext *s, AVStream *st);
8c8eab8b 221
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222/**
223 * Setup AVCodecContext options for avformat_find_stream_info().
224 *
225 * Create an array of dictionaries, one dictionary for each stream
226 * contained in s.
227 * Each dictionary will contain the options from codec_opts which can
228 * be applied to the corresponding stream codec context.
229 *
230 * @return pointer to the created array of dictionaries, NULL if it
231 * cannot be created
3009f521 232 */
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233AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
234 AVDictionary *codec_opts);
3009f521 235
8c8eab8b 236/**
49bd8e4b 237 * Print an error message to stderr, indicating filename and a human
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238 * readable description of the error code err.
239 *
240 * If strerror_r() is not available the use of this function in a
241 * multithreaded application may be unsafe.
242 *
243 * @see av_strerror()
244 */
01310af2 245void print_error(const char *filename, int err);
c5dc6026 246
f35917b2 247/**
49bd8e4b 248 * Print the program banner to stderr. The banner contents depend on the
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249 * current version of the repository and of the libav* libraries used by
250 * the program.
86074ed1 251 */
ea9c581f 252void show_banner(void);
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253
254/**
49bd8e4b 255 * Print the version of the program to stdout. The version message
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256 * depends on the current versions of the repository and of the libav*
257 * libraries.
86074ed1 258 */
64555bd9 259void show_version(void);
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260
261/**
49bd8e4b 262 * Print the license of the program to stdout. The license depends on
15067504 263 * the license of the libraries compiled into the program.
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264 */
265void show_license(void);
266
ba9880c1 267/**
49bd8e4b 268 * Print a listing containing all the formats supported by the
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269 * program.
270 */
271void show_formats(void);
272
090b61b2 273/**
49bd8e4b 274 * Print a listing containing all the codecs supported by the
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275 * program.
276 */
277void show_codecs(void);
278
279/**
49bd8e4b 280 * Print a listing containing all the filters supported by the
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281 * program.
282 */
283void show_filters(void);
284
285/**
49bd8e4b 286 * Print a listing containing all the bit stream filters supported by the
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287 * program.
288 */
289void show_bsfs(void);
290
291/**
49bd8e4b 292 * Print a listing containing all the protocols supported by the
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293 * program.
294 */
295void show_protocols(void);
296
297/**
49bd8e4b 298 * Print a listing containing all the pixel formats supported by the
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299 * program.
300 */
301void show_pix_fmts(void);
302
303/**
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304 * Print a listing containing all the sample formats supported by the
305 * program.
306 */
307int show_sample_fmts(const char *opt, const char *arg);
308
309/**
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310 * Return a positive value if a line read from standard input
311 * starts with [yY], otherwise return 0.
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312 */
313int read_yesno(void);
314
458b062d 315/**
49bd8e4b 316 * Read the file with name filename, and put its content in a newly
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317 * allocated 0-terminated buffer.
318 *
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319 * @param bufptr location where pointer to buffer is returned
320 * @param size location where size of buffer is returned
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321 * @return 0 in case of success, a negative value corresponding to an
322 * AVERROR error code in case of failure.
323 */
02170990 324int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
458b062d 325
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326typedef struct {
327 int64_t num_faulty_pts; /// Number of incorrect PTS values so far
328 int64_t num_faulty_dts; /// Number of incorrect DTS values so far
329 int64_t last_pts; /// PTS of the last frame
330 int64_t last_dts; /// DTS of the last frame
331} PtsCorrectionContext;
332
333/**
f03f30d7 334 * Reset the state of the PtsCorrectionContext.
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335 */
336void init_pts_correction(PtsCorrectionContext *ctx);
337
338/**
f03f30d7 339 * Attempt to guess proper monotonic timestamps for decoded video frames
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340 * which might have incorrect times. Input timestamps may wrap around, in
341 * which case the output will as well.
342 *
f03f30d7 343 * @param pts the pts field of the decoded AVPacket, as passed through
7a8bfa5d 344 * AVCodecContext.reordered_opaque
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345 * @param dts the dts field of the decoded AVPacket
346 * @return one of the input values, may be AV_NOPTS_VALUE
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347 */
348int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
349
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350/**
351 * Get a file corresponding to a preset file.
352 *
353 * If is_path is non-zero, look for the file in the path preset_name.
050dc127 354 * Otherwise search for a file named arg.avpreset in the directories
25c27f37 355 * $AVCONV_DATADIR (if set), $HOME/.avconv, and in the datadir defined
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356 * at configuration time, in that order. If no such file is found and
357 * codec_name is defined, then search for a file named
050dc127 358 * codec_name-preset_name.avpreset in the above-mentioned directories.
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359 *
360 * @param filename buffer where the name of the found filename is written
361 * @param filename_size size in bytes of the filename buffer
362 * @param preset_name name of the preset to search
363 * @param is_path tell if preset_name is a filename path
364 * @param codec_name name of the codec for which to look for the
365 * preset, may be NULL
366 */
367FILE *get_preset_file(char *filename, size_t filename_size,
368 const char *preset_name, int is_path, const char *codec_name);
369
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370/**
371 * Do all the necessary cleanup and abort.
372 * This function is implemented in the avtools, not cmdutils.
373 */
374void exit_program(int ret);
375
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376/**
377 * Realloc array to hold new_size elements of elem_size.
378 * Calls exit_program() on failure.
379 *
380 * @param elem_size size in bytes of each element
381 * @param size new element count will be written here
382 * @return reallocated array
383 */
384void *grow_array(void *array, int elem_size, int *size, int new_size);
385
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386typedef struct FrameBuffer {
387 uint8_t *base[4];
388 uint8_t *data[4];
389 int linesize[4];
390
391 int h, w;
392 enum PixelFormat pix_fmt;
393
394 int refcount;
395 struct FrameBuffer **pool; ///< head of the buffer pool
396 struct FrameBuffer *next;
397} FrameBuffer;
398
399/**
400 * Get a frame from the pool. This is intended to be used as a callback for
401 * AVCodecContext.get_buffer.
402 *
403 * @param s codec context. s->opaque must be a pointer to the head of the
404 * buffer pool.
405 * @param frame frame->opaque will be set to point to the FrameBuffer
406 * containing the frame data.
407 */
408int codec_get_buffer(AVCodecContext *s, AVFrame *frame);
409
410/**
411 * A callback to be used for AVCodecContext.release_buffer along with
412 * codec_get_buffer().
413 */
414void codec_release_buffer(AVCodecContext *s, AVFrame *frame);
415
416/**
417 * A callback to be used for AVFilterBuffer.free.
418 * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer
419 * containing the buffer data.
420 */
421void filter_release_buffer(AVFilterBuffer *fb);
422
423/**
424 * Free all the buffers in the pool. This must be called after all the
425 * buffers have been released.
426 */
427void free_buffer_pool(FrameBuffer **pool);
153382e1 428#endif /* LIBAV_CMDUTILS_H */