/* * 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)); /** * Reports an error corresponding to the provided * AVERROR code and calls exit_program() with the * corresponding POSIX error code. * @note ret must be an AVERROR-value of a POSIX error code *       (i.e. AVERROR(EFOO) and not AVERROR_FOO). *       library functions can return both, so call this only *       with AVERROR(EFOO) of your own. */void report_and_exit(int ret) av_noreturn; /** * 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 */