cmdutils: split per-option code out of parse_options().
[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
86 * corresponding commandline option name)
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
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92 */
93double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);
94
7542157d 95/**
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96 * Parse a string specifying a time and return its corresponding
97 * value as a number of microseconds. Exit from the application if
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98 * the string cannot be correctly parsed.
99 *
100 * @param context the context of the value to be set (e.g. the
101 * corresponding commandline option name)
102 * @param timestr the string to be parsed
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103 * @param is_duration a flag which tells how to interpret timestr, if
104 * not zero timestr is interpreted as a duration, otherwise as a
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105 * date
106 *
748061de 107 * @see parse_date()
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108 */
109int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);
110
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111typedef struct {
112 const char *name;
113 int flags;
114#define HAS_ARG 0x0001
115#define OPT_BOOL 0x0002
116#define OPT_EXPERT 0x0004
117#define OPT_STRING 0x0008
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118#define OPT_VIDEO 0x0010
119#define OPT_AUDIO 0x0020
120#define OPT_GRAB 0x0040
26d4f26b 121#define OPT_INT 0x0080
394c4d77 122#define OPT_FLOAT 0x0100
ae27975d 123#define OPT_SUBTITLE 0x0200
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124#define OPT_INT64 0x0400
125#define OPT_EXIT 0x0800
126#define OPT_DATA 0x1000
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127#define OPT_FUNC2 0x2000
128#define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
ae27975d 129 union {
7efe05ab 130 void *dst_ptr;
26513856 131 int (*func_arg)(const char *, const char *);
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132 int (*func2_arg)(void *, const char *, const char *);
133 size_t off;
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134 } u;
135 const char *help;
136 const char *argname;
137} OptionDef;
138
02d504a7 139void show_help_options(const OptionDef *options, const char *msg, int mask, int value);
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140
141/**
49bd8e4b 142 * Parse the command line arguments.
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143 *
144 * @param optctx an opaque options context
60a9966e 145 * @param options Array with the definitions required to interpret every
0baf34d8 146 * option of the form: -option_name [argument]
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147 * @param parse_arg_function Name of the function called to process every
148 * argument without a leading option name flag. NULL if such arguments do
149 * not have to be processed.
150 */
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151void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
152 void (* parse_arg_function)(void *optctx, const char*));
60a9966e 153
8d787f8e 154/**
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155 * Parse one given option.
156 *
157 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
158 */
159int parse_option(void *optctx, const char *opt, const char *arg, const OptionDef *options);
160
161/**
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162 * Check if the given stream matches a stream specifier.
163 *
164 * @param s Corresponding format context.
165 * @param st Stream from s to be checked.
166 * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
167 *
168 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
169 */
170int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
171
172/**
8c8eab8b 173 * Filter out options for given codec.
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174 *
175 * Create a new options dictionary containing only the options from
176 * opts which apply to the codec with ID codec_id.
177 *
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178 * @param s Corresponding format context.
179 * @param st A stream from s for which the options should be filtered.
ce23ca81 180 * @return a pointer to the created dictionary
8c8eab8b 181 */
d4863fc1 182AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, AVFormatContext *s, AVStream *st);
8c8eab8b 183
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184/**
185 * Setup AVCodecContext options for avformat_find_stream_info().
186 *
187 * Create an array of dictionaries, one dictionary for each stream
188 * contained in s.
189 * Each dictionary will contain the options from codec_opts which can
190 * be applied to the corresponding stream codec context.
191 *
192 * @return pointer to the created array of dictionaries, NULL if it
193 * cannot be created
3009f521 194 */
8ec19f84 195AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts);
3009f521 196
8c8eab8b 197/**
49bd8e4b 198 * Print an error message to stderr, indicating filename and a human
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199 * readable description of the error code err.
200 *
201 * If strerror_r() is not available the use of this function in a
202 * multithreaded application may be unsafe.
203 *
204 * @see av_strerror()
205 */
01310af2 206void print_error(const char *filename, int err);
c5dc6026 207
f35917b2 208/**
49bd8e4b 209 * Print the program banner to stderr. The banner contents depend on the
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210 * current version of the repository and of the libav* libraries used by
211 * the program.
86074ed1 212 */
ea9c581f 213void show_banner(void);
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214
215/**
49bd8e4b 216 * Print the version of the program to stdout. The version message
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217 * depends on the current versions of the repository and of the libav*
218 * libraries.
86074ed1 219 */
64555bd9 220void show_version(void);
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221
222/**
49bd8e4b 223 * Print the license of the program to stdout. The license depends on
15067504 224 * the license of the libraries compiled into the program.
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225 */
226void show_license(void);
227
ba9880c1 228/**
49bd8e4b 229 * Print a listing containing all the formats supported by the
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230 * program.
231 */
232void show_formats(void);
233
090b61b2 234/**
49bd8e4b 235 * Print a listing containing all the codecs supported by the
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236 * program.
237 */
238void show_codecs(void);
239
240/**
49bd8e4b 241 * Print a listing containing all the filters supported by the
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242 * program.
243 */
244void show_filters(void);
245
246/**
49bd8e4b 247 * Print a listing containing all the bit stream filters supported by the
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248 * program.
249 */
250void show_bsfs(void);
251
252/**
49bd8e4b 253 * Print a listing containing all the protocols supported by the
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254 * program.
255 */
256void show_protocols(void);
257
258/**
49bd8e4b 259 * Print a listing containing all the pixel formats supported by the
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260 * program.
261 */
262void show_pix_fmts(void);
263
264/**
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265 * Return a positive value if a line read from standard input
266 * starts with [yY], otherwise return 0.
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267 */
268int read_yesno(void);
269
458b062d 270/**
49bd8e4b 271 * Read the file with name filename, and put its content in a newly
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272 * allocated 0-terminated buffer.
273 *
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274 * @param bufptr location where pointer to buffer is returned
275 * @param size location where size of buffer is returned
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276 * @return 0 in case of success, a negative value corresponding to an
277 * AVERROR error code in case of failure.
278 */
279int read_file(const char *filename, char **bufptr, size_t *size);
280
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281typedef struct {
282 int64_t num_faulty_pts; /// Number of incorrect PTS values so far
283 int64_t num_faulty_dts; /// Number of incorrect DTS values so far
284 int64_t last_pts; /// PTS of the last frame
285 int64_t last_dts; /// DTS of the last frame
286} PtsCorrectionContext;
287
288/**
f03f30d7 289 * Reset the state of the PtsCorrectionContext.
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290 */
291void init_pts_correction(PtsCorrectionContext *ctx);
292
293/**
f03f30d7 294 * Attempt to guess proper monotonic timestamps for decoded video frames
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295 * which might have incorrect times. Input timestamps may wrap around, in
296 * which case the output will as well.
297 *
f03f30d7 298 * @param pts the pts field of the decoded AVPacket, as passed through
7a8bfa5d 299 * AVCodecContext.reordered_opaque
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300 * @param dts the dts field of the decoded AVPacket
301 * @return one of the input values, may be AV_NOPTS_VALUE
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302 */
303int64_t guess_correct_pts(PtsCorrectionContext *ctx, int64_t pts, int64_t dts);
304
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305/**
306 * Get a file corresponding to a preset file.
307 *
308 * If is_path is non-zero, look for the file in the path preset_name.
309 * Otherwise search for a file named arg.ffpreset in the directories
310 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
311 * at configuration time, in that order. If no such file is found and
312 * codec_name is defined, then search for a file named
313 * codec_name-preset_name.ffpreset in the above-mentioned directories.
314 *
315 * @param filename buffer where the name of the found filename is written
316 * @param filename_size size in bytes of the filename buffer
317 * @param preset_name name of the preset to search
318 * @param is_path tell if preset_name is a filename path
319 * @param codec_name name of the codec for which to look for the
320 * preset, may be NULL
321 */
322FILE *get_preset_file(char *filename, size_t filename_size,
323 const char *preset_name, int is_path, const char *codec_name);
324
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325typedef struct {
326 enum PixelFormat pix_fmt;
327} FFSinkContext;
328
329extern AVFilter ffsink;
330
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331/**
332 * Extract a frame from sink.
333 *
334 * @return a negative error in case of failure, 1 if one frame has
335 * been extracted successfully.
336 */
337int get_filtered_video_frame(AVFilterContext *sink, AVFrame *frame,
338 AVFilterBufferRef **picref, AVRational *pts_tb);
339
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340/**
341 * Do all the necessary cleanup and abort.
342 * This function is implemented in the avtools, not cmdutils.
343 */
344void exit_program(int ret);
345
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346/**
347 * Realloc array to hold new_size elements of elem_size.
348 * Calls exit_program() on failure.
349 *
350 * @param elem_size size in bytes of each element
351 * @param size new element count will be written here
352 * @return reallocated array
353 */
354void *grow_array(void *array, int elem_size, int *size, int new_size);
355
153382e1 356#endif /* LIBAV_CMDUTILS_H */