/* * 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; /** * 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); enum OptionType {    OPT_TYPE_FUNC,    OPT_TYPE_BOOL,    OPT_TYPE_STRING,    OPT_TYPE_INT,    OPT_TYPE_INT64,    OPT_TYPE_FLOAT,    OPT_TYPE_DOUBLE,    OPT_TYPE_TIME,}; /** * Parse a string and return its corresponding value as a double. * * @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 */int parse_number(const char *context, const char *numstr, enum OptionType type,                 double min, double max, double *dst); enum StreamList {    STREAM_LIST_ALL,    STREAM_LIST_STREAM_ID,    STREAM_LIST_PROGRAM,    STREAM_LIST_GROUP_ID,    STREAM_LIST_GROUP_IDX,}; typedef struct StreamSpecifier {    // trailing stream index - pick idx-th stream that matches    // all the other constraints; -1 when not present    int                  idx;     // which stream list to consider    enum StreamList      stream_list;     // STREAM_LIST_STREAM_ID: stream ID    // STREAM_LIST_GROUP_IDX: group index    // STREAM_LIST_GROUP_ID:  group ID    // STREAM_LIST_PROGRAM:   program ID    int64_t              list_id;     // when not AVMEDIA_TYPE_UNKNOWN, consider only streams of this type    enum AVMediaType     media_type;    uint8_t              no_apic;     uint8_t              usable_only;     int                  disposition;     char                *meta_key;    char                *meta_val;     char                *remainder;} StreamSpecifier; /** * Parse a stream specifier string into a form suitable for matching. * * @param ss Parsed specifier will be stored here; must be uninitialized *           with stream_specifier_uninit() when no longer needed. * @param spec String containing the stream specifier to be parsed. * @param allow_remainder When 1, the part of spec that is left after parsing *                        the stream specifier is stored into ss->remainder. *                        When 0, any remainder will cause parsing to fail. */int stream_specifier_parse(StreamSpecifier *ss, const char *spec,                           int allow_remainder, void *logctx); /** * @return 1 if st matches the parsed specifier, 0 if it does not */unsigned stream_specifier_match(const StreamSpecifier *ss,                                const AVFormatContext *s, const AVStream *st,                                void *logctx); void stream_specifier_uninit(StreamSpecifier *ss); typedef struct SpecifierOpt {    // original specifier or empty string    char            *specifier;    // parsed specifier for OPT_FLAG_PERSTREAM options    StreamSpecifier  stream_spec;     union {        uint8_t *str;        int        i;        int64_t  i64;        uint64_t ui64;        float      f;        double   dbl;    } u;} SpecifierOpt; typedef struct SpecifierOptList {    SpecifierOpt    *opt;    int           nb_opt;     /* Canonical option definition that was parsed into this list. */    const struct OptionDef *opt_canon;    /* Type corresponding to the field that should be used from SpecifierOpt.u.     * May not match the option type, e.g. OPT_TYPE_BOOL options are stored as     * int, so this field would be OPT_TYPE_INT for them */    enum OptionType type;} SpecifierOptList; typedef struct OptionDef {    const char *name;    enum OptionType type;    int flags; /* The OPT_TYPE_FUNC option takes an argument. * Must not be used with other option types, as for those it holds: * - OPT_TYPE_BOOL do not take an argument * - all other types do */#define OPT_FUNC_ARG    (1 << 0)/* Program will immediately exit after processing this option */#define OPT_EXIT        (1 << 1)/* Option is intended for advanced users. Only affects * help output. */#define OPT_EXPERT      (1 << 2)#define OPT_VIDEO       (1 << 3)#define OPT_AUDIO       (1 << 4)#define OPT_SUBTITLE    (1 << 5)#define OPT_DATA        (1 << 6)/* The option is per-file (currently ffmpeg-only). At least one of OPT_INPUT, * OPT_OUTPUT, OPT_DECODER must be set when this flag is in use.   */#define OPT_PERFILE     (1 << 7) /* Option is specified as an offset in a passed optctx. * Always use as OPT_OFFSET in option definitions. */#define OPT_FLAG_OFFSET (1 << 8)#define OPT_OFFSET      (OPT_FLAG_OFFSET | OPT_PERFILE) /* Option is to be stored in a SpecifierOptList.   Always use as OPT_SPEC in option definitions. */#define OPT_FLAG_SPEC   (1 << 9)#define OPT_SPEC        (OPT_FLAG_SPEC | OPT_OFFSET) /* Option applies per-stream (implies OPT_SPEC). */#define OPT_FLAG_PERSTREAM  (1 << 10)#define OPT_PERSTREAM   (OPT_FLAG_PERSTREAM | OPT_SPEC) /* ffmpeg-only - specifies whether an OPT_PERFILE option applies to input, * output, or both. */#define OPT_INPUT       (1 << 11)#define OPT_OUTPUT      (1 << 12) /* This option is a "canonical" form, to which one or more alternatives * exist. These alternatives are listed in u1.names_alt. */#define OPT_HAS_ALT     (1 << 13)/* This option is an alternative form of some other option, whose * name is stored in u1.name_canon */#define OPT_HAS_CANON   (1 << 14) /* ffmpeg-only - OPT_PERFILE may apply to standalone decoders */#define OPT_DECODER     (1 << 15)      union {        void *dst_ptr;        int (*func_arg)(void *, const char *, const char *);        size_t off;    } u;    const char *help;    const char *argname;     union {        /* Name of the canonical form of this option.         * Is valid when OPT_HAS_CANON is set. */        const char *name_canon;        /* A NULL-terminated list of alternate forms of this option.         * Is valid when OPT_HAS_ALT is set. */        const char * const *names_alt;    } u1;} 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. */void show_help_options(const OptionDef *options, const char *msg, int req_flags,                       int rej_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. */int parse_options(void *optctx, int argc, char **argv, const OptionDef *options,                  int (* 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, const OptionDef *defs); /** * 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. * @param dst a pointer to the created dictionary * @param opts_used if non-NULL, every option stored in dst is also stored here, *                  with specifiers preserved * @return a non-negative number on success, a negative error code on failure */int filter_codec_opts(const AVDictionary *opts, enum AVCodecID codec_id,                      AVFormatContext *s, AVStream *st, const AVCodec *codec,                      AVDictionary **dst, AVDictionary **opts_used); /** * 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. */int setup_find_stream_info_opts(AVFormatContext *s,                                AVDictionary *codec_opts,                                AVDictionary ***dst); /** * 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() */static inline void print_error(const char *filename, int err){    av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, av_err2str(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

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