summaryrefslogtreecommitdiffstats
path: root/cmdutils.h
blob: 3544cdb9f07e827eaf956dfaa02634f8482fde72 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
/*
 * Various utilities for command line tools
 * copyright (c) 2003 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef FFMPEG_CMDUTILS_H
#define FFMPEG_CMDUTILS_H

#include <stdint.h>

#include "libavcodec/avcodec.h"
#include "libavfilter/avfilter.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"

#ifdef __MINGW32__
#undef main /* We don't want SDL to override our main() */
#endif

/**
 * program name, defined by the program for show_version().
 */
extern const char program_name[];

/**
 * program birth year, defined by the program for show_banner()
 */
extern const int program_birth_year;

extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
extern AVFormatContext *avformat_opts;
extern struct SwsContext *sws_opts;
extern AVDictionary *format_opts, *codec_opts;

/**
 * Initialize the cmdutils option system, in particular
 * allocate the *_opts contexts.
 */
void init_opts(void);
/**
 * Uninitialize the cmdutils option system, in particular
 * free the *_opts contexts and their contents.
 */
void uninit_opts(void);

/**
 * Trivial log callback.
 * Only suitable for opt_help and similar since it lacks prefix handling.
 */
void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);

/**
 * Fallback for options that are not explicitly handled, these will be
 * parsed through AVOptions.
 */
int opt_default(const char *opt, const char *arg);

/**
 * Set the libav* libraries log level.
 */
int opt_loglevel(const char *opt, const char *arg);

int opt_codec_debug(const char *opt, const char *arg);

/**
 * Limit the execution time.
 */
int opt_timelimit(const char *opt, const char *arg);

/**
 * Parse a string and return its corresponding value as a double.
 * Exit from the application if the string cannot be correctly
 * parsed or the corresponding value is invalid.
 *
 * @param context the context of the value to be set (e.g. the
 * corresponding commandline option name)
 * @param numstr the string to be parsed
 * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
 * string should be parsed
 * @param min the minimum valid accepted value
 * @param max the maximum valid accepted value
 */
double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max);

/**
 * Parse a string specifying a time and return its corresponding
 * value as a number of microseconds. Exit from the application if
 * the string cannot be correctly parsed.
 *
 * @param context the context of the value to be set (e.g. the
 * corresponding commandline option name)
 * @param timestr the string to be parsed
 * @param is_duration a flag which tells how to interpret timestr, if
 * not zero timestr is interpreted as a duration, otherwise as a
 * date
 *
 * @see parse_date()
 */
int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration);

typedef struct SpecifierOpt {
    char *specifier;    /**< stream/chapter/program/... specifier */
    union {
        uint8_t *str;
        int        i;
        int64_t  i64;
        float      f;
        double   dbl;
    } u;
} SpecifierOpt;

typedef struct {
    const char *name;
    int flags;
#define HAS_ARG    0x0001
#define OPT_BOOL   0x0002
#define OPT_EXPERT 0x0004
#define OPT_STRING 0x0008
#define OPT_VIDEO  0x0010
#define OPT_AUDIO  0x0020
#define OPT_GRAB   0x0040
#define OPT_INT    0x0080
#define OPT_FLOAT  0x0100
#define OPT_SUBTITLE 0x0200
#define OPT_INT64  0x0400
#define OPT_EXIT   0x0800
#define OPT_DATA   0x1000
#define OPT_FUNC2  0x2000
#define OPT_OFFSET 0x4000       /* option is specified as an offset in a passed optctx */
#define OPT_SPEC   0x8000       /* option is to be stored in an array of SpecifierOpt.
                                   Implies OPT_OFFSET. Next element after the offset is
                                   an int containing element count in the array. */
#define OPT_TIME  0x10000
#define OPT_DOUBLE 0x20000
     union {
        void *dst_ptr;
        int (*func_arg)(const char *, const char *);
        int (*func2_arg)(void *, const char *, const char *);
        size_t off;
    } u;
    const char *help;
    const char *argname;
} OptionDef;

void show_help_options(const OptionDef *options, const char *msg, int mask, int value);

/**
 * Show help for all options with given flags in class and all its
 * children.
 */
void show_help_children(const AVClass *class, int flags);

/**
 * Parse the command line arguments.
 *
 * @param optctx an opaque options context
 * @param options Array with the definitions required to interpret every
 * option of the form: -option_name [argument]
 * @param parse_arg_function Name of the function called to process every
 * argument without a leading option name flag. NULL if such arguments do
 * not have to be processed.
 */
void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
                   void (* parse_arg_function)(void *optctx, const char*));

/**
 * Parse one given option.
 *
 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
 */
int parse_option(void *optctx, const char *opt, const char *arg, const OptionDef *options);

/**
 * Find the '-loglevel' option in the commandline args and apply it.
 */
void parse_loglevel(int argc, char **argv, const OptionDef *options);

/**
 * Check if the given stream matches a stream specifier.
 *
 * @param s  Corresponding format context.
 * @param st Stream from s to be checked.
 * @param spec A stream specifier of the [v|a|s|d]:[<stream index>] form.
 *
 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
 */
int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);

/**
 * Filter out options for given codec.
 *
 * Create a new options dictionary containing only the options from
 * opts which apply to the codec with ID codec_id.
 *
 * @param s Corresponding format context.
 * @param st A stream from s for which the options should be filtered.
 * @return a pointer to the created dictionary
 */
AVDictionary *filter_codec_opts(AVDictionary *opts, enum CodecID codec_id, AVFormatContext *s, AVStream *st);

/**
 * Setup AVCodecContext options for avformat_find_stream_info().
 *
 * Create an array of dictionaries, one dictionary for each stream
 * contained in s.
 * Each dictionary will contain the options from codec_opts which can
 * be applied to the corresponding stream codec context.
 *
 * @return pointer to the created array of dictionaries, NULL if it
 * cannot be created
 */
AVDictionary **setup_find_stream_info_opts(AVFormatContext *s, AVDictionary *codec_opts);

/**
 * Print an error message to stderr, indicating filename and a human
 * readable description of the error code err.
 *
 * If strerror_r() is not available the use of this function in a
 * multithreaded application may be unsafe.
 *
 * @see av_strerror()
 */
void print_error(const char *filename, int err);

/**
 * Print the program banner to stderr. The banner contents depend on the
 * current version of the repository and of the libav* libraries used by
 * the program.
 */
void show_banner(void);

/**
 * Print the version of the program to stdout. The version message
 * depends on the current versions of the repository and of the libav*
 * libraries.
 * This option processing function does not utilize the arguments.
 */
int opt_version(const char *opt, const char *arg);

/**
 * Print the license of the program to stdout. The license depends on
 * the license of the libraries compiled into the program.
 * This option processing function does not utilize the arguments.
 */
int opt_license(const char *opt, const char *arg);

/**
 * Print a listing containing all the formats supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_formats(const char *opt, const char *arg);

/**
 * Print a listing containing all the codecs supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_codecs(const char *opt, const char *arg);

/**
 * Print a listing containing all the filters supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_filters(const char *opt, const char *arg);

/**
 * Print a listing containing all the bit stream filters supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_bsfs(const char *opt, const char *arg);

/**
 * Print a listing containing all the protocols supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_protocols(const char *opt, const char *arg);

/**
 * Print a listing containing all the pixel formats supported by the
 * program.
 * This option processing function does not utilize the arguments.
 */
int opt_pix_fmts(const char *opt, const char *arg);

/**
 * Print a listing containing all the sample formats supported by the
 * program.
 */
int show_sample_fmts(const char *opt, const char *arg);

/**
 * Return a positive value if a line read from standard input
 * starts with [yY], otherwise return 0.
 */
int read_yesno(void);

/**
 * Read the file with name filename, and put its content in a newly
 * allocated 0-terminated buffer.
 *
 * @param bufptr location where pointer to buffer is returned
 * @param size   location where size of buffer is returned
 * @return 0 in case of success, a negative value corresponding to an
 * AVERROR error code in case of failure.
 */
int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);

/**
 * Get a file corresponding to a preset file.
 *
 * If is_path is non-zero, look for the file in the path preset_name.
 * Otherwise search for a file named arg.ffpreset in the directories
 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
 * at configuration time or in a "ffpresets" folder along the executable
 * on win32, in that order. If no such file is found and
 * codec_name is defined, then search for a file named
 * codec_name-preset_name.ffpreset in the above-mentioned directories.
 *
 * @param filename buffer where the name of the found filename is written
 * @param filename_size size in bytes of the filename buffer
 * @param preset_name name of the preset to search
 * @param is_path tell if preset_name is a filename path
 * @param codec_name name of the codec for which to look for the
 * preset, may be NULL
 */
FILE *get_preset_file(char *filename, size_t filename_size,
                      const char *preset_name, int is_path, const char *codec_name);

/**
 * Do all the necessary cleanup and abort.
 * This function is implemented in the avtools, not cmdutils.
 */
void exit_program(int ret);

/**
 * Realloc array to hold new_size elements of elem_size.
 * Calls exit_program() on failure.
 *
 * @param elem_size size in bytes of each element
 * @param size new element count will be written here
 * @return reallocated array
 */
void *grow_array(void *array, int elem_size, int *size, int new_size);

#endif /* CMDUTILS_H */
OpenPOWER on IntegriCloud