/* * 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 FFTOOLS_CMDUTILS_H #define FFTOOLS_CMDUTILS_H #include <stdint.h> #include "config.h" #include "libavcodec/avcodec.h" #include "libavfilter/avfilter.h" #include "libavformat/avformat.h" #include "libswscale/swscale.h" #ifdef _WIN32 #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 AVDictionary *sws_dict; extern AVDictionary *swr_opts; extern AVDictionary *format_opts, *codec_opts; extern int hide_banner; /** * Register a program-specific cleanup routine. */ void register_exit(void (*cb)(int ret)); /** * Wraps exit with a program-specific cleanup routine. */ void exit_program(int ret) av_noreturn; /** * Initialize dynamic library loading */ void init_dynload(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(void *optctx, const char *opt, const char *arg); /** * Limit the execution time. */ int opt_timelimit(void *optctx, 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 command line 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 command line 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 av_parse_time() */ 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; uint64_t ui64; float f; double dbl; } u; } SpecifierOpt; typedef struct OptionDef { 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_INT 0x0080 #define OPT_FLOAT 0x0100 #define OPT_SUBTITLE 0x0200 #define OPT_INT64 0x0400 #define OPT_EXIT 0x0800 #define OPT_DATA 0x1000 #define OPT_PERFILE 0x2000 /* the option is per-file (currently ffmpeg-only). implied by OPT_OFFSET or OPT_SPEC */ #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 #define OPT_INPUT 0x40000 #define OPT_OUTPUT 0x80000 union { void *dst_ptr; int (*func_arg)(void *, const char *, const char *); size_t off; } u; const char *help; const char *argname; } OptionDef; /** * Print help for all options matching specified flags. * * @param options a list of options * @param msg title of this group. Only printed if at least one option matches. * @param req_flags print only options which have all those flags set. * @param rej_flags don't print options which have any of those flags set. * @param alt_flags print only options that have at least one of those flags set */ void show_help_options(const OptionDef *options, const char *msg, int req_flags, int rej_flags, int alt_flags); /** * Show help for all options with given flags in class and all its * children. */ void show_help_children(const AVClass *class, int flags); /** * Per-fftool specific help handler. Implemented in each * fftool, called by show_help(). */ void show_help_default(const char *opt, const char *arg); /** * Parse the command line arguments. * * @param optctx an opaque options context * @param argc number of command line arguments * @param argv values of command line arguments * @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); /** * An option extracted from the commandline. * Cannot use AVDictionary because of options like -map which can be * used multiple times. */ typedef struct Option { const OptionDef *opt; const char *key; const char *val; } Option; typedef struct OptionGroupDef { /**< group name */ const char *name; /** * Option to be used as group separator. Can be NULL for groups which * are terminated by a non-option argument (e.g. ffmpeg output files) */ const char *sep; /** * Option flags that must be set on each option that is * applied to this group */ int flags; } OptionGroupDef; typedef struct OptionGroup { const OptionGroupDef *group_def; const char *arg; Option *opts; int nb_opts; AVDictionary *codec_opts; AVDictionary *format_opts; AVDictionary *sws_dict; AVDictionary *swr_opts; } OptionGroup; /** * A list of option groups that all have the same group type * (e.g. input files or output files) */ typedef struct OptionGroupList { const OptionGroupDef *group_def; OptionGroup *groups; int nb_groups; } OptionGroupList; typedef struct OptionParseContext { OptionGroup global_opts; OptionGroupList *groups; int nb_groups; /* parsing state */ OptionGroup cur_group; } OptionParseContext; /** * Parse an options group and write results into optctx. * * @param optctx an app-specific options context. NULL for global options group */ int parse_optgroup(void *optctx, OptionGroup *g); /** * Split the commandline into an intermediate form convenient for further * processing. * * The commandline is assumed to be composed of options which either belong to a * group (those with OPT_SPEC, OPT_OFFSET or OPT_PERFILE) or are global * (everything else). * * A group (defined by an OptionGroupDef struct) is a sequence of options * terminated by either a group separator option (e.g. -i) or a parameter that * is not an option (doesn't start with -). A group without a separator option * must always be first in the supplied groups list. * * All options within the same group are stored in one OptionGroup struct in an * OptionGroupList, all groups with the same group definition are stored in one * OptionGroupList in OptionParseContext.groups. The order of group lists is the * same as the order of group definitions. */ int split_commandline(OptionParseContext *octx, int argc, char *argv[], const OptionDef *options, const OptionGroupDef *groups, int nb_groups); /** * Free all allocated memory in an OptionParseContext. */ void uninit_parse_context(OptionParseContext *octx); /** * Find the '-loglevel' option in the command line args and apply it. */ void parse_loglevel(int argc, char **argv, const OptionDef *options); /** * Return index of option opt in argv or 0 if not found. */ int locate_option(int argc, char **argv, const OptionDef *options, const char *optname); /** * 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 opts dictionary to place options in * @param codec_id ID of the codec that should be filtered for * @param s Corresponding format context. * @param st A stream from s for which the options should be filtered. * @param codec The particular codec for which the options should be filtered. * If null, the default one is looked up according to the codec id. * @return a pointer to the created dictionary */ AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id, AVFormatContext *s, AVStream *st, const AVCodec *codec); /** * 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. * Calls exit() on failure. */ 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(int argc, char **argv, const OptionDef *options); /** * Return a positive value if a line read from standard input * starts with [yY], otherwise return 0. */ int read_yesno(void); /** * 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.avpreset 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); /** * Realloc array to hold new_size elements of elem_size. * Calls exit() on failure. * * @param array array to reallocate * @param elem_size size in bytes of each element * @param size new element count will be written here * @param new_size number of elements to place in reallocated array * @return reallocated array */ void *grow_array(void *array, int elem_size, int *size, int new_size); /** * Atomically add a new element to an array of pointers, i.e. allocate * a new entry, reallocate the array of pointers and make the new last * member of this array point to the newly allocated buffer. * Calls exit() on failure. * * @param array array of pointers to reallocate * @param elem_size size of the new element to allocate * @param nb_elems pointer to the number of elements of the array array; * *nb_elems will be incremented by one by this function. * @return pointer to the newly allocated entry */ void *allocate_array_elem(void *array, size_t elem_size, int *nb_elems); #define GROW_ARRAY(array, nb_elems)\ array = grow_array(array, sizeof(*array), &nb_elems, nb_elems + 1) #define ALLOC_ARRAY_ELEM(array, nb_elems)\ allocate_array_elem(&array, sizeof(*array[0]), &nb_elems) #define GET_PIX_FMT_NAME(pix_fmt)\ const char *name = av_get_pix_fmt_name(pix_fmt); #define GET_CODEC_NAME(id)\ const char *name = avcodec_descriptor_get(id)->name; #define GET_SAMPLE_FMT_NAME(sample_fmt)\ const char *name = av_get_sample_fmt_name(sample_fmt) #define GET_SAMPLE_RATE_NAME(rate)\ char name[16];\ snprintf(name, sizeof(name), "%d", rate); double get_rotation(int32_t *displaymatrix); #endif /* FFTOOLS_CMDUTILS_H */