ffprobe.c

    writer_print_section_header(w, SECTION_ID_LIBRARY_VERSIONS);
    SHOW_LIB_VERSION(avutil,     AVUTIL);
    SHOW_LIB_VERSION(avcodec,    AVCODEC);
    SHOW_LIB_VERSION(avformat,   AVFORMAT);
    SHOW_LIB_VERSION(avdevice,   AVDEVICE);
    SHOW_LIB_VERSION(avfilter,   AVFILTER);
    SHOW_LIB_VERSION(swscale,    SWSCALE);
    SHOW_LIB_VERSION(swresample, SWRESAMPLE);
    SHOW_LIB_VERSION(postproc,   POSTPROC);
    writer_print_section_footer(w);
}

static int opt_format(void *optctx, const char *opt, const char *arg)
{
    iformat = av_find_input_format(arg);
    if (!iformat) {
        av_log(NULL, AV_LOG_ERROR, "Unknown input format: %s\n", arg);
        return AVERROR(EINVAL);
    }
    return 0;
}

static inline void mark_section_show_entries(SectionID section_id,
                                             int show_all_entries, AVDictionary *entries)
{
    struct section *section = &sections[section_id];

    section->show_all_entries = show_all_entries;
    if (show_all_entries) {
        SectionID *id;
        for (id = section->children_ids; *id != -1; id++)
            mark_section_show_entries(*id, show_all_entries, entries);
    } else {
        av_dict_copy(&section->entries_to_show, entries, 0);
    }
}

static int match_section(const char *section_name,
                         int show_all_entries, AVDictionary *entries)
{
    int i, ret = 0;

    for (i = 0; i < FF_ARRAY_ELEMS(sections); i++) {
        const struct section *section = &sections[i];
        if (!strcmp(section_name, section->name) ||
            (section->unique_name && !strcmp(section_name, section->unique_name))) {
            av_log(NULL, AV_LOG_DEBUG,
                   "'%s' matches section with unique name '%s'\n", section_name,
                   (char *)av_x_if_null(section->unique_name, section->name));
            ret++;
            mark_section_show_entries(section->id, show_all_entries, entries);
        }
    }
    return ret;
}

static int opt_show_entries(void *optctx, const char *opt, const char *arg)
{
    const char *p = arg;
    int ret = 0;

    while (*p) {
        AVDictionary *entries = NULL;
        char *section_name = av_get_token(&p, "=:");
        int show_all_entries = 0;

        if (!section_name) {
            av_log(NULL, AV_LOG_ERROR,
                   "Missing section name for option '%s'\n", opt);
            return AVERROR(EINVAL);
        }

        if (*p == '=') {
            p++;
            while (*p && *p != ':') {
                char *entry = av_get_token(&p, ",:");
                if (!entry)
                    break;
                av_log(NULL, AV_LOG_VERBOSE,
                       "Adding '%s' to the entries to show in section '%s'\n",
                       entry, section_name);
                av_dict_set(&entries, entry, "", AV_DICT_DONT_STRDUP_KEY);
                if (*p == ',')
                    p++;
            }
        } else {
            show_all_entries = 1;
        }

        ret = match_section(section_name, show_all_entries, entries);
        if (ret == 0) {
            av_log(NULL, AV_LOG_ERROR, "No match for section '%s'\n", section_name);
            ret = AVERROR(EINVAL);
        }
        av_dict_free(&entries);
        av_free(section_name);

        if (ret <= 0)
            break;
        if (*p)
            p++;
    }

    return ret;
}

static int opt_show_format_entry(void *optctx, const char *opt, const char *arg)
{
    char *buf = av_asprintf("format=%s", arg);
    int ret;

    av_log(NULL, AV_LOG_WARNING,
           "Option '%s' is deprecated, use '-show_entries format=%s' instead\n",
           opt, arg);
    ret = opt_show_entries(optctx, opt, buf);
    av_free(buf);
    return ret;
}

static void opt_input_file(void *optctx, const char *arg)
{
    if (input_filename) {
        av_log(NULL, AV_LOG_ERROR,
                "Argument '%s' provided as input filename, but '%s' was already specified.\n",
                arg, input_filename);
        exit(1);
    }
    if (!strcmp(arg, "-"))
        arg = "pipe:";
    input_filename = arg;
}

static int opt_input_file_i(void *optctx, const char *opt, const char *arg)
{
    opt_input_file(optctx, arg);
    return 0;
}

void show_help_default(const char *opt, const char *arg)
{
    av_log_set_callback(log_callback_help);
    show_usage();
    show_help_options(options, "Main options:", 0, 0, 0);
    printf("\n");

    show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);
}

static int opt_pretty(void *optctx, const char *opt, const char *arg)
{
    show_value_unit              = 1;
    use_value_prefix             = 1;
    use_byte_value_binary_prefix = 1;
    use_value_sexagesimal_format = 1;
    return 0;
}

static void print_section(SectionID id, int level)
{
    const SectionID *pid;
    const struct section *section = &sections[id];
    printf("%c%c%c",
           section->flags & SECTION_FLAG_IS_WRAPPER           ? 'W' : '.',
           section->flags & SECTION_FLAG_IS_ARRAY             ? 'A' : '.',
           section->flags & SECTION_FLAG_HAS_VARIABLE_FIELDS  ? 'V' : '.');
    printf("%*c  %s", level * 4, ' ', section->name);
    if (section->unique_name)
        printf("/%s", section->unique_name);
    printf("\n");

    for (pid = section->children_ids; *pid != -1; pid++)
        print_section(*pid, level+1);
}

static int opt_sections(void *optctx, const char *opt, const char *arg)
{
    printf("Sections:\n"
           "W.. = Section is a wrapper (contains other sections, no local entries)\n"
           ".A. = Section contains an array of elements of the same type\n"
           "..V = Section may contain a variable number of fields with variable keys\n"
           "FLAGS NAME/UNIQUE_NAME\n"
           "---\n");
    print_section(SECTION_ID_ROOT, 0);
    return 0;
}

static int opt_show_versions(const char *opt, const char *arg)
{
    mark_section_show_entries(SECTION_ID_PROGRAM_VERSION, 1, NULL);
    mark_section_show_entries(SECTION_ID_LIBRARY_VERSION, 1, NULL);
    return 0;
}

#define DEFINE_OPT_SHOW_SECTION(section, target_section_id)             \
    static int opt_show_##section(const char *opt, const char *arg)     \
    {                                                                   \
        mark_section_show_entries(SECTION_ID_##target_section_id, 1, NULL); \
        return 0;                                                       \
    }

DEFINE_OPT_SHOW_SECTION(chapters,         CHAPTERS);
DEFINE_OPT_SHOW_SECTION(error,            ERROR);
DEFINE_OPT_SHOW_SECTION(format,           FORMAT);
DEFINE_OPT_SHOW_SECTION(frames,           FRAMES);
DEFINE_OPT_SHOW_SECTION(library_versions, LIBRARY_VERSIONS);
DEFINE_OPT_SHOW_SECTION(packets,          PACKETS);
DEFINE_OPT_SHOW_SECTION(program_version,  PROGRAM_VERSION);
DEFINE_OPT_SHOW_SECTION(streams,          STREAMS);

static const OptionDef real_options[] = {
#include "cmdutils_common_opts.h"
    { "f", HAS_ARG, {.func_arg = opt_format}, "force format", "format" },
    { "unit", OPT_BOOL, {&show_value_unit}, "show unit of the displayed values" },
    { "prefix", OPT_BOOL, {&use_value_prefix}, "use SI prefixes for the displayed values" },
    { "byte_binary_prefix", OPT_BOOL, {&use_byte_value_binary_prefix},
      "use binary prefixes for byte units" },
    { "sexagesimal", OPT_BOOL,  {&use_value_sexagesimal_format},
      "use sexagesimal format HOURS:MM:SS.MICROSECONDS for time units" },
    { "pretty", 0, {.func_arg = opt_pretty},
      "prettify the format of displayed values, make it more human readable" },
    { "print_format", OPT_STRING | HAS_ARG, {(void*)&print_format},
      "set the output printing format (available formats are: default, compact, csv, flat, ini, json, xml)", "format" },
    { "of", OPT_STRING | HAS_ARG, {(void*)&print_format}, "alias for -print_format", "format" },
    { "select_streams", OPT_STRING | HAS_ARG, {(void*)&stream_specifier}, "select the specified streams", "stream_specifier" },
    { "sections", OPT_EXIT, {.func_arg = opt_sections}, "print sections structure and section information, and exit" },
    { "show_data",    OPT_BOOL, {(void*)&do_show_data}, "show packets data" },
    { "show_error",   0, {(void*)&opt_show_error},  "show probing error" },
    { "show_format",  0, {(void*)&opt_show_format}, "show format/container info" },
    { "show_frames",  0, {(void*)&opt_show_frames}, "show frames info" },
    { "show_format_entry", HAS_ARG, {.func_arg = opt_show_format_entry},
      "show a particular entry from the format/container info", "entry" },
    { "show_entries", HAS_ARG, {.func_arg = opt_show_entries},
      "show a set of specified entries", "entry_list" },
    { "show_packets", 0, {(void*)&opt_show_packets}, "show packets info" },
    { "show_streams", 0, {(void*)&opt_show_streams}, "show streams info" },
    { "show_chapters", 0, {(void*)&opt_show_chapters}, "show chapters info" },
    { "count_frames", OPT_BOOL, {(void*)&do_count_frames}, "count the number of frames per stream" },
    { "count_packets", OPT_BOOL, {(void*)&do_count_packets}, "count the number of packets per stream" },
    { "show_program_version",  0, {(void*)&opt_show_program_version},  "show ffprobe version" },
    { "show_library_versions", 0, {(void*)&opt_show_library_versions}, "show library versions" },
    { "show_versions",         0, {(void*)&opt_show_versions}, "show program and library versions" },
    { "show_private_data", OPT_BOOL, {(void*)&show_private_data}, "show private data" },
    { "private",           OPT_BOOL, {(void*)&show_private_data}, "same as show_private_data" },
    { "bitexact", OPT_BOOL, {&do_bitexact}, "force bitexact output" },
    { "default", HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, {.func_arg = opt_default}, "generic catch all option", "" },
    { "i", HAS_ARG, {.func_arg = opt_input_file_i}, "read specified file", "input_file"},
    { NULL, },
};

static inline int check_section_show_entries(int section_id)
{
    int *id;
    struct section *section = &sections[section_id];
    if (sections[section_id].show_all_entries || sections[section_id].entries_to_show)
        return 1;
    for (id = section->children_ids; *id != -1; id++)
        if (check_section_show_entries(*id))
            return 1;
    return 0;
}

#define SET_DO_SHOW(id, varname) do {                                   \
        if (check_section_show_entries(SECTION_ID_##id))                \
            do_show_##varname = 1;                                      \
    } while (0)

int main(int argc, char **argv)
{
    const Writer *w;
    WriterContext *wctx;
    char *buf;
    char *w_name = NULL, *w_args = NULL;
    int ret, i;

    av_log_set_flags(AV_LOG_SKIP_REPEATED);
    atexit(exit_program);

    options = real_options;
    parse_loglevel(argc, argv, options);
    av_register_all();
    avformat_network_init();
    init_opts();
#if CONFIG_AVDEVICE
    avdevice_register_all();
#endif

    show_banner(argc, argv, options);
    parse_options(NULL, argc, argv, options, opt_input_file);

    /* mark things to show, based on -show_entries */
    SET_DO_SHOW(CHAPTERS, chapters);
    SET_DO_SHOW(ERROR, error);
    SET_DO_SHOW(FORMAT, format);
    SET_DO_SHOW(FRAMES, frames);
    SET_DO_SHOW(LIBRARY_VERSIONS, library_versions);
    SET_DO_SHOW(PACKETS, packets);
    SET_DO_SHOW(PROGRAM_VERSION, program_version);
    SET_DO_SHOW(STREAMS, streams);
    SET_DO_SHOW(STREAM_DISPOSITION, stream_disposition);

    if (do_bitexact && (do_show_program_version || do_show_library_versions)) {
        av_log(NULL, AV_LOG_ERROR,
               "-bitexact and -show_program_version or -show_library_versions "
               "options are incompatible\n");
        ret = AVERROR(EINVAL);
        goto end;
    }

    writer_register_all();

    if (!print_format)
        print_format = av_strdup("default");
    if (!print_format) {
        ret = AVERROR(ENOMEM);
        goto end;
    }
    w_name = av_strtok(print_format, "=", &buf);
    w_args = buf;

    w = writer_get_by_name(w_name);
    if (!w) {
        av_log(NULL, AV_LOG_ERROR, "Unknown output format with name '%s'\n", w_name);
        ret = AVERROR(EINVAL);
        goto end;
    }

    if ((ret = writer_open(&wctx, w, w_args,
                           sections, FF_ARRAY_ELEMS(sections))) >= 0) {
        writer_print_section_header(wctx, SECTION_ID_ROOT);

        if (do_show_program_version)
            ffprobe_show_program_version(wctx);
        if (do_show_library_versions)
            ffprobe_show_library_versions(wctx);

        if (!input_filename &&
            ((do_show_format || do_show_streams || do_show_chapters || do_show_packets || do_show_error) ||
             (!do_show_program_version && !do_show_library_versions))) {
            show_usage();
            av_log(NULL, AV_LOG_ERROR, "You have to specify one input file.\n");
            av_log(NULL, AV_LOG_ERROR, "Use -h to get full help or, even better, run 'man %s'.\n", program_name);
            ret = AVERROR(EINVAL);
        } else if (input_filename) {
            ret = probe_file(wctx, input_filename);
            if (ret < 0 && do_show_error)
                show_error(wctx, ret);
        }

        writer_print_section_footer(wctx);
        writer_close(&wctx);
    }

end:
    av_freep(&print_format);

    uninit_opts();
    for (i = 0; i < FF_ARRAY_ELEMS(sections); i++)
        av_dict_free(&(sections[i].entries_to_show));

    avformat_network_deinit();

    return ret < 0;
}