/* * 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 AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];extern AVFormatContext *avformat_opts;extern AVDictionary *sws_dict;extern AVDictionary *swr_opts;extern AVDictionary *format_opts, *codec_opts, *resample_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); /** * 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); /** * Override the cpuflags. */int opt_cpuflags(void *optctx, const char *opt, const char *arg); /** * Override the cpucount. */int opt_cpucount(void *optctx, const char *opt, const char *arg); /** * 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); /** * Set the libav* libraries log level. */int opt_loglevel(void *optctx, const char *opt, const char *arg); int opt_report(void *optctx, const char *opt, const char *arg); int opt_max_alloc(void *optctx, const char *opt, const char *arg); int opt_codec_debug(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); #if CONFIG_AVDEVICE#define CMDUTILS_COMMON_OPTIONS_AVDEVICE                                                                                \    { "sources"    , OPT_EXIT | HAS_ARG, { .func_arg = show_sources },                                                  \      "list sources of the input device", "device" },                                                                   \    { "sinks"      , OPT_EXIT | HAS_ARG, { .func_arg = show_sinks },                                                    \      "list sinks of the output device", "device" },                                                                    \ #else#define CMDUTILS_COMMON_OPTIONS_AVDEVICE#endif #define CMDUTILS_COMMON_OPTIONS                                                                                         \    { "L",           OPT_EXIT,             { .func_arg = show_license },     "show license" },                          \    { "h",           OPT_EXIT,             { .func_arg = show_help },        "show help", "topic" },                    \    { "?",           OPT_EXIT,             { .func_arg = show_help },        "show help", "topic" },                    \    { "help",        OPT_EXIT,             { .func_arg = show_help },        "show help", "topic" },                    \    { "-help",       OPT_EXIT,             { .func_arg = show_help },        "show help", "topic" },                    \    { "version",     OPT_EXIT,             { .func_arg = show_version },     "show version" },                          \    { "buildconf",   OPT_EXIT,             { .func_arg = show_buildconf },   "show build configuration" },              \    { "formats",     OPT_EXIT,             { .func_arg = show_formats },     "show available formats" },                \    { "muxers",      OPT_EXIT,             { .func_arg = show_muxers },      "show available muxers" },                 \    { "demuxers",    OPT_EXIT,             { .func_arg = show_demuxers },    "show available demuxers" },               \    { "devices",     OPT_EXIT,             { .func_arg = show_devices },     "show available devices" },                \    { "codecs",      OPT_EXIT,             { .func_arg = show_codecs },      "show available codecs" },                 \    { "decoders",    OPT_EXIT,             { .func_arg = show_decoders },    "show available decoders" },               \    { "encoders",    OPT_EXIT,             { .func_arg = show_encoders },    "show available encoders" },               \    { "bsfs",        OPT_EXIT,             { .func_arg = show_bsfs },        "show available bit stream filters" },     \    { "protocols",   OPT_EXIT,             { .func_arg = show_protocols },   "show available protocols" },              \    { "filters",     OPT_EXIT,             { .func_arg = show_filters },     "show available filters" },                \    { "pix_fmts",    OPT_EXIT,             { .func_arg = show_pix_fmts },    "show available pixel formats" },          \    { "layouts",     OPT_EXIT,             { .func_arg = show_layouts },     "show standard channel layouts" },         \    { "sample_fmts", OPT_EXIT,             { .func_arg = show_sample_fmts }, "show available audio sample formats" },   \    { "colors",      OPT_EXIT,             { .func_arg = show_colors },      "show available color names" },            \    { "loglevel",    HAS_ARG,              { .func_arg = opt_loglevel },     "set logging level", "loglevel" },         \    { "v",           HAS_ARG,              { .func_arg = opt_loglevel },     "set logging level", "loglevel" },         \    { "report",      0,                    { .func_arg = opt_report },       "generate a report" },                     \    { "max_alloc",   HAS_ARG,              { .func_arg = opt_max_alloc },    "set maximum size of a single allocated block", "bytes" }, \    { "cpuflags",    HAS_ARG | OPT_EXPERT, { .func_arg = opt_cpuflags },     "force specific cpu flags", "flags" },     \    { "cpucount",    HAS_ARG | OPT_EXPERT, { .func_arg = opt_cpucount },     "force specific cpu count", "count" },     \    { "hide_banner", OPT_BOOL | OPT_EXPERT, {&hide_banner},     "do not show program banner", "hide_banner" },          \    CMDUTILS_COMMON_OPTIONS_AVDEVICE                                                                                    \ /** * 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); /** * Generic -h handler common to all fftools. */int show_help(void *optctx, 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 *resample_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, 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(int argc, char **argv, const OptionDef *options); /** * 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 show_version(void *optctx, const char *opt, const char *arg); /** * Print the build configuration of the program to stdout. The contents * depend on the definition of FFMPEG_CONFIGURATION. * This option processing function does not utilize the arguments. */int show_buildconf(void *optctx, 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 show_license(void *optctx, const char *opt, const char *arg); /** * Print a listing containing all the formats supported by the * program (including devices). * This option processing function does not utilize the arguments. */int show_formats(void *optctx, const char *opt, const char *arg); /** * Print a listing containing all the muxers supported by the * program (including devices). * This option processing function does not utilize the arguments. */int show_muxers(void *optctx, const char *opt, const char *arg); /** * Print a listing containing all the demuxer supported by the * program (including devices). * This option processing function does not utilize the arguments. */int show_demuxers(void *optctx, const char *opt, const char *arg); /**

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