2 * Various utilities for command line tools
3 * copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
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.
12 * FFmpeg is distributed in the hope that it will be useful,
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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef FFMPEG_CMDUTILS_H
23 #define FFMPEG_CMDUTILS_H
27 #include "libavcodec/avcodec.h"
28 #include "libavfilter/avfilter.h"
29 #include "libavformat/avformat.h"
30 #include "libswscale/swscale.h"
33 #undef main /* We don't want SDL to override our main() */
37 * program name, defined by the program for show_version().
39 extern const char program_name[];
42 * program birth year, defined by the program for show_banner()
44 extern const int program_birth_year;
47 * this year, defined by the program for show_banner()
49 extern const int this_year;
51 extern AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
52 extern AVFormatContext *avformat_opts;
53 extern struct SwsContext *sws_opts;
54 extern struct SwrContext *swr_opts;
55 extern AVDictionary *format_opts, *codec_opts;
58 * Initialize the cmdutils option system, in particular
59 * allocate the *_opts contexts.
63 * Uninitialize the cmdutils option system, in particular
64 * free the *_opts contexts and their contents.
66 void uninit_opts(void);
69 * Trivial log callback.
70 * Only suitable for opt_help and similar since it lacks prefix handling.
72 void log_callback_help(void* ptr, int level, const char* fmt, va_list vl);
75 * Fallback for options that are not explicitly handled, these will be
76 * parsed through AVOptions.
78 int opt_default(void *optctx, const char *opt, const char *arg);
81 * Set the libav* libraries log level.
83 int opt_loglevel(void *optctx, const char *opt, const char *arg);
85 int opt_report(const char *opt);
87 int opt_max_alloc(void *optctx, const char *opt, const char *arg);
89 int opt_cpuflags(void *optctx, const char *opt, const char *arg);
91 int opt_codec_debug(void *optctx, const char *opt, const char *arg);
94 * Limit the execution time.
96 int opt_timelimit(void *optctx, const char *opt, const char *arg);
99 * Parse a string and return its corresponding value as a double.
100 * Exit from the application if the string cannot be correctly
101 * parsed or the corresponding value is invalid.
103 * @param context the context of the value to be set (e.g. the
104 * corresponding command line option name)
105 * @param numstr the string to be parsed
106 * @param type the type (OPT_INT64 or OPT_FLOAT) as which the
107 * string should be parsed
108 * @param min the minimum valid accepted value
109 * @param max the maximum valid accepted value
111 double parse_number_or_die(const char *context, const char *numstr, int type,
112 double min, double max);
115 * Parse a string specifying a time and return its corresponding
116 * value as a number of microseconds. Exit from the application if
117 * the string cannot be correctly parsed.
119 * @param context the context of the value to be set (e.g. the
120 * corresponding command line option name)
121 * @param timestr the string to be parsed
122 * @param is_duration a flag which tells how to interpret timestr, if
123 * not zero timestr is interpreted as a duration, otherwise as a
128 int64_t parse_time_or_die(const char *context, const char *timestr,
131 typedef struct SpecifierOpt {
132 char *specifier; /**< stream/chapter/program/... specifier */
142 typedef struct OptionDef {
145 #define HAS_ARG 0x0001
146 #define OPT_BOOL 0x0002
147 #define OPT_EXPERT 0x0004
148 #define OPT_STRING 0x0008
149 #define OPT_VIDEO 0x0010
150 #define OPT_AUDIO 0x0020
151 #define OPT_INT 0x0080
152 #define OPT_FLOAT 0x0100
153 #define OPT_SUBTITLE 0x0200
154 #define OPT_INT64 0x0400
155 #define OPT_EXIT 0x0800
156 #define OPT_DATA 0x1000
157 #define OPT_PERFILE 0x2000 /* the option is per-file (currently ffmpeg-only).
158 implied by OPT_OFFSET or OPT_SPEC */
159 #define OPT_OFFSET 0x4000 /* option is specified as an offset in a passed optctx */
160 #define OPT_SPEC 0x8000 /* option is to be stored in an array of SpecifierOpt.
161 Implies OPT_OFFSET. Next element after the offset is
162 an int containing element count in the array. */
163 #define OPT_TIME 0x10000
164 #define OPT_DOUBLE 0x20000
167 int (*func_arg)(void *, const char *, const char *);
175 * Print help for all options matching specified flags.
177 * @param options a list of options
178 * @param msg title of this group. Only printed if at least one option matches.
179 * @param req_flags print only options which have all those flags set.
180 * @param rej_flags don't print options which have any of those flags set.
181 * @param alt_flags print only options that have at least one of those flags set
183 void show_help_options(const OptionDef *options, const char *msg, int req_flags,
184 int rej_flags, int alt_flags);
187 * Show help for all options with given flags in class and all its
190 void show_help_children(const AVClass *class, int flags);
193 * Per-avtool specific help handler. Implemented in each
194 * avtool, called by show_help().
196 void show_help_default(const char *opt, const char *arg);
199 * Generic -h handler common to all avtools.
201 int show_help(void *optctx, const char *opt, const char *arg);
204 * Parse the command line arguments.
206 * @param optctx an opaque options context
207 * @param argc number of command line arguments
208 * @param argv values of command line arguments
209 * @param options Array with the definitions required to interpret every
210 * option of the form: -option_name [argument]
211 * @param parse_arg_function Name of the function called to process every
212 * argument without a leading option name flag. NULL if such arguments do
213 * not have to be processed.
215 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
216 void (* parse_arg_function)(void *optctx, const char*));
219 * Parse one given option.
221 * @return on success 1 if arg was consumed, 0 otherwise; negative number on error
223 int parse_option(void *optctx, const char *opt, const char *arg,
224 const OptionDef *options);
227 * Find the '-loglevel' option in the command line args and apply it.
229 void parse_loglevel(int argc, char **argv, const OptionDef *options);
232 * Return index of option opt in argv or 0 if not found.
234 int locate_option(int argc, char **argv, const OptionDef *options,
235 const char *optname);
238 * Check if the given stream matches a stream specifier.
240 * @param s Corresponding format context.
241 * @param st Stream from s to be checked.
242 * @param spec A stream specifier of the [v|a|s|d]:[\<stream index\>] form.
244 * @return 1 if the stream matches, 0 if it doesn't, <0 on error
246 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec);
249 * Filter out options for given codec.
251 * Create a new options dictionary containing only the options from
252 * opts which apply to the codec with ID codec_id.
254 * @param opts dictionary to place options in
255 * @param codec_id ID of the codec that should be filtered for
256 * @param s Corresponding format context.
257 * @param st A stream from s for which the options should be filtered.
258 * @param codec The particular codec for which the options should be filtered.
259 * If null, the default one is looked up according to the codec id.
260 * @return a pointer to the created dictionary
262 AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
263 AVFormatContext *s, AVStream *st, AVCodec *codec);
266 * Setup AVCodecContext options for avformat_find_stream_info().
268 * Create an array of dictionaries, one dictionary for each stream
270 * Each dictionary will contain the options from codec_opts which can
271 * be applied to the corresponding stream codec context.
273 * @return pointer to the created array of dictionaries, NULL if it
276 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
277 AVDictionary *codec_opts);
280 * Print an error message to stderr, indicating filename and a human
281 * readable description of the error code err.
283 * If strerror_r() is not available the use of this function in a
284 * multithreaded application may be unsafe.
288 void print_error(const char *filename, int err);
291 * Print the program banner to stderr. The banner contents depend on the
292 * current version of the repository and of the libav* libraries used by
295 void show_banner(int argc, char **argv, const OptionDef *options);
298 * Print the version of the program to stdout. The version message
299 * depends on the current versions of the repository and of the libav*
301 * This option processing function does not utilize the arguments.
303 int show_version(void *optctx, const char *opt, const char *arg);
306 * Print the license of the program to stdout. The license depends on
307 * the license of the libraries compiled into the program.
308 * This option processing function does not utilize the arguments.
310 int show_license(void *optctx, const char *opt, const char *arg);
313 * Print a listing containing all the formats supported by the
315 * This option processing function does not utilize the arguments.
317 int show_formats(void *optctx, const char *opt, const char *arg);
320 * Print a listing containing all the codecs supported by the
322 * This option processing function does not utilize the arguments.
324 int show_codecs(void *optctx, const char *opt, const char *arg);
327 * Print a listing containing all the decoders supported by the
330 int show_decoders(void *optctx, const char *opt, const char *arg);
333 * Print a listing containing all the encoders supported by the
336 int show_encoders(void *optctx, const char *opt, const char *arg);
339 * Print a listing containing all the filters supported by the
341 * This option processing function does not utilize the arguments.
343 int show_filters(void *optctx, const char *opt, const char *arg);
346 * Print a listing containing all the bit stream filters supported by the
348 * This option processing function does not utilize the arguments.
350 int show_bsfs(void *optctx, const char *opt, const char *arg);
353 * Print a listing containing all the protocols supported by the
355 * This option processing function does not utilize the arguments.
357 int show_protocols(void *optctx, const char *opt, const char *arg);
360 * Print a listing containing all the pixel formats supported by the
362 * This option processing function does not utilize the arguments.
364 int show_pix_fmts(void *optctx, const char *opt, const char *arg);
367 * Print a listing containing all the standard channel layouts supported by
369 * This option processing function does not utilize the arguments.
371 int show_layouts(void *optctx, const char *opt, const char *arg);
374 * Print a listing containing all the sample formats supported by the
377 int show_sample_fmts(void *optctx, const char *opt, const char *arg);
380 * Return a positive value if a line read from standard input
381 * starts with [yY], otherwise return 0.
383 int read_yesno(void);
386 * Read the file with name filename, and put its content in a newly
387 * allocated 0-terminated buffer.
389 * @param filename file to read from
390 * @param bufptr location where pointer to buffer is returned
391 * @param size location where size of buffer is returned
392 * @return 0 in case of success, a negative value corresponding to an
393 * AVERROR error code in case of failure.
395 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size);
398 * Get a file corresponding to a preset file.
400 * If is_path is non-zero, look for the file in the path preset_name.
401 * Otherwise search for a file named arg.ffpreset in the directories
402 * $FFMPEG_DATADIR (if set), $HOME/.ffmpeg, and in the datadir defined
403 * at configuration time or in a "ffpresets" folder along the executable
404 * on win32, in that order. If no such file is found and
405 * codec_name is defined, then search for a file named
406 * codec_name-preset_name.avpreset in the above-mentioned directories.
408 * @param filename buffer where the name of the found filename is written
409 * @param filename_size size in bytes of the filename buffer
410 * @param preset_name name of the preset to search
411 * @param is_path tell if preset_name is a filename path
412 * @param codec_name name of the codec for which to look for the
413 * preset, may be NULL
415 FILE *get_preset_file(char *filename, size_t filename_size,
416 const char *preset_name, int is_path, const char *codec_name);
419 * Realloc array to hold new_size elements of elem_size.
420 * Calls exit() on failure.
422 * @param array array to reallocate
423 * @param elem_size size in bytes of each element
424 * @param size new element count will be written here
425 * @param new_size number of elements to place in reallocated array
426 * @return reallocated array
428 void *grow_array(void *array, int elem_size, int *size, int new_size);
430 typedef struct FrameBuffer {
436 enum AVPixelFormat pix_fmt;
439 struct FrameBuffer **pool; ///< head of the buffer pool
440 struct FrameBuffer *next;
444 * Get a frame from the pool. This is intended to be used as a callback for
445 * AVCodecContext.get_buffer.
447 * @param s codec context. s->opaque must be a pointer to the head of the
449 * @param frame frame->opaque will be set to point to the FrameBuffer
450 * containing the frame data.
452 int codec_get_buffer(AVCodecContext *s, AVFrame *frame);
455 * A callback to be used for AVCodecContext.release_buffer along with
456 * codec_get_buffer().
458 void codec_release_buffer(AVCodecContext *s, AVFrame *frame);
461 * A callback to be used for AVFilterBuffer.free.
462 * @param fb buffer to free. fb->priv must be a pointer to the FrameBuffer
463 * containing the buffer data.
465 void filter_release_buffer(AVFilterBuffer *fb);
468 * Free all the buffers in the pool. This must be called after all the
469 * buffers have been released.
471 void free_buffer_pool(FrameBuffer **pool);
473 #define GET_PIX_FMT_NAME(pix_fmt)\
474 const char *name = av_get_pix_fmt_name(pix_fmt);
476 #define GET_SAMPLE_FMT_NAME(sample_fmt)\
477 const char *name = av_get_sample_fmt_name(sample_fmt)
479 #define GET_SAMPLE_RATE_NAME(rate)\
481 snprintf(name, sizeof(name), "%d", rate);
483 #define GET_CH_LAYOUT_NAME(ch_layout)\
485 snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
487 #define GET_CH_LAYOUT_DESC(ch_layout)\
489 av_get_channel_layout_string(name, sizeof(name), 0, ch_layout);
491 #endif /* CMDUTILS_H */