cmdutils.c

/*
 * Various utilities for command line tools
 * Copyright (c) 2000-2003 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
 */

#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <math.h>

/* Include only the enabled headers since some compilers (namely, Sun
   Studio) will not omit unused inline functions and create undefined
   references to libraries that are not being built. */

#include "config.h"
#include "compat/va_copy.h"
#include "libavformat/avformat.h"
#include "libavfilter/avfilter.h"
#include "libavdevice/avdevice.h"
#include "libavresample/avresample.h"
#include "libswscale/swscale.h"
#include "libswresample/swresample.h"
#if CONFIG_POSTPROC
#include "libpostproc/postprocess.h"
#endif
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/mathematics.h"
#include "libavutil/imgutils.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/eval.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "cmdutils.h"
#include "version.h"
#if CONFIG_NETWORK
#include "libavformat/network.h"
#endif
#if HAVE_SYS_RESOURCE_H
#include <sys/time.h>
#include <sys/resource.h>
#endif

static int init_report(const char *env);

struct SwsContext *sws_opts;
SwrContext *swr_opts;
AVDictionary *format_opts, *codec_opts;

const int this_year = 2012;

static FILE *report_file;

void init_opts(void)
{

    if(CONFIG_SWSCALE)
        sws_opts = sws_getContext(16, 16, 0, 16, 16, 0, SWS_BICUBIC,
                              NULL, NULL, NULL);

    if(CONFIG_SWRESAMPLE)
        swr_opts = swr_alloc();
}

void uninit_opts(void)
{
#if CONFIG_SWSCALE
    sws_freeContext(sws_opts);
    sws_opts = NULL;
#endif

    if(CONFIG_SWRESAMPLE)
        swr_free(&swr_opts);

    av_dict_free(&format_opts);
    av_dict_free(&codec_opts);
}

void log_callback_help(void *ptr, int level, const char *fmt, va_list vl)
{
    vfprintf(stdout, fmt, vl);
}

static void log_callback_report(void *ptr, int level, const char *fmt, va_list vl)
{
    va_list vl2;
    char line[1024];
    static int print_prefix = 1;

    va_copy(vl2, vl);
    av_log_default_callback(ptr, level, fmt, vl);
    av_log_format_line(ptr, level, fmt, vl2, line, sizeof(line), &print_prefix);
    va_end(vl2);
    fputs(line, report_file);
    fflush(report_file);
}

double parse_number_or_die(const char *context, const char *numstr, int type,
                           double min, double max)
{
    char *tail;
    const char *error;
    double d = av_strtod(numstr, &tail);
    if (*tail)
        error = "Expected number for %s but found: %s\n";
    else if (d < min || d > max)
        error = "The value for %s was %s which is not within %f - %f\n";
    else if (type == OPT_INT64 && (int64_t)d != d)
        error = "Expected int64 for %s but found %s\n";
    else if (type == OPT_INT && (int)d != d)
        error = "Expected int for %s but found %s\n";
    else
        return d;
    av_log(NULL, AV_LOG_FATAL, error, context, numstr, min, max);
    exit(1);
    return 0;
}

int64_t parse_time_or_die(const char *context, const char *timestr,
                          int is_duration)
{
    int64_t us;
    if (av_parse_time(&us, timestr, is_duration) < 0) {
        av_log(NULL, AV_LOG_FATAL, "Invalid %s specification for %s: %s\n",
               is_duration ? "duration" : "date", context, timestr);
        exit(1);
    }
    return us;
}

void show_help_options(const OptionDef *options, const char *msg, int req_flags,
                       int rej_flags, int alt_flags)
{
    const OptionDef *po;
    int first;

    first = 1;
    for (po = options; po->name != NULL; po++) {
        char buf[64];

        if (((po->flags & req_flags) != req_flags) ||
            (alt_flags && !(po->flags & alt_flags)) ||
            (po->flags & rej_flags))
            continue;

        if (first) {
            printf("%s\n", msg);
            first = 0;
        }
        av_strlcpy(buf, po->name, sizeof(buf));
        if (po->argname) {
            av_strlcat(buf, " ", sizeof(buf));
            av_strlcat(buf, po->argname, sizeof(buf));
        }
        printf("-%-17s  %s\n", buf, po->help);
    }
    printf("\n");
}

void show_help_children(const AVClass *class, int flags)
{
    const AVClass *child = NULL;
    if (class->option) {
        av_opt_show2(&class, NULL, flags, 0);
        printf("\n");
    }

    while (child = av_opt_child_class_next(class, child))
        show_help_children(child, flags);
}

static const OptionDef *find_option(const OptionDef *po, const char *name)
{
    const char *p = strchr(name, ':');
    int len = p ? p - name : strlen(name);

    while (po->name != NULL) {
        if (!strncmp(name, po->name, len) && strlen(po->name) == len)
            break;
        po++;
    }
    return po;
}

#if HAVE_COMMANDLINETOARGVW
#include <windows.h>
#include <shellapi.h>
/* Will be leaked on exit */
static char** win32_argv_utf8 = NULL;
static int win32_argc = 0;

/**
 * Prepare command line arguments for executable.
 * For Windows - perform wide-char to UTF-8 conversion.
 * Input arguments should be main() function arguments.
 * @param argc_ptr Arguments number (including executable)
 * @param argv_ptr Arguments list.
 */
static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
{
    char *argstr_flat;
    wchar_t **argv_w;
    int i, buffsize = 0, offset = 0;

    if (win32_argv_utf8) {
        *argc_ptr = win32_argc;
        *argv_ptr = win32_argv_utf8;
        return;
    }

    win32_argc = 0;
    argv_w = CommandLineToArgvW(GetCommandLineW(), &win32_argc);
    if (win32_argc <= 0 || !argv_w)
        return;

    /* determine the UTF-8 buffer size (including NULL-termination symbols) */
    for (i = 0; i < win32_argc; i++)
        buffsize += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
                                        NULL, 0, NULL, NULL);

    win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
    argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
    if (win32_argv_utf8 == NULL) {
        LocalFree(argv_w);
        return;
    }

    for (i = 0; i < win32_argc; i++) {
        win32_argv_utf8[i] = &argstr_flat[offset];
        offset += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
                                      &argstr_flat[offset],
                                      buffsize - offset, NULL, NULL);
    }
    win32_argv_utf8[i] = NULL;
    LocalFree(argv_w);

    *argc_ptr = win32_argc;
    *argv_ptr = win32_argv_utf8;
}
#else
static inline void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
{
    /* nothing to do */
}
#endif /* HAVE_COMMANDLINETOARGVW */

static int write_option(void *optctx, const OptionDef *po, const char *opt,
                        const char *arg)
{
    /* new-style options contain an offset into optctx, old-style address of
     * a global var*/
    void *dst = po->flags & (OPT_OFFSET | OPT_SPEC) ?
                (uint8_t *)optctx + po->u.off : po->u.dst_ptr;
    int *dstcount;

    if (po->flags & OPT_SPEC) {
        SpecifierOpt **so = dst;
        char *p = strchr(opt, ':');

        dstcount = (int *)(so + 1);
        *so = grow_array(*so, sizeof(**so), dstcount, *dstcount + 1);
        (*so)[*dstcount - 1].specifier = av_strdup(p ? p + 1 : "");
        dst = &(*so)[*dstcount - 1].u;
    }

    if (po->flags & OPT_STRING) {
        char *str;
        str = av_strdup(arg);
//         av_freep(dst);
        *(char **)dst = str;
    } else if (po->flags & OPT_BOOL || po->flags & OPT_INT) {
        *(int *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
    } else if (po->flags & OPT_INT64) {
        *(int64_t *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
    } else if (po->flags & OPT_TIME) {
        *(int64_t *)dst = parse_time_or_die(opt, arg, 1);
    } else if (po->flags & OPT_FLOAT) {
        *(float *)dst = parse_number_or_die(opt, arg, OPT_FLOAT, -INFINITY, INFINITY);
    } else if (po->flags & OPT_DOUBLE) {
        *(double *)dst = parse_number_or_die(opt, arg, OPT_DOUBLE, -INFINITY, INFINITY);
    } else if (po->u.func_arg) {
        int ret = po->u.func_arg(optctx, opt, arg);
        if (ret < 0) {
            av_log(NULL, AV_LOG_ERROR,
                   "Failed to set value '%s' for option '%s'\n", arg, opt);
            return ret;
        }
    }
    if (po->flags & OPT_EXIT)
        exit(0);

    return 0;
}

int parse_option(void *optctx, const char *opt, const char *arg,
                 const OptionDef *options)
{
    const OptionDef *po;
    int ret;

    po = find_option(options, opt);
    if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
        /* handle 'no' bool option */
        po = find_option(options, opt + 2);
        if ((po->name && (po->flags & OPT_BOOL)))
            arg = "0";
    } else if (po->flags & OPT_BOOL)
        arg = "1";

    if (!po->name)
        po = find_option(options, "default");
    if (!po->name) {
        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'\n", opt);
        return AVERROR(EINVAL);
    }
    if (po->flags & HAS_ARG && !arg) {
        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'\n", opt);
        return AVERROR(EINVAL);
    }

    ret = write_option(optctx, po, opt, arg);
    if (ret < 0)
        return ret;

    return !!(po->flags & HAS_ARG);
}

void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
                   void (*parse_arg_function)(void *, const char*))
{
    const char *opt;
    int optindex, handleoptions = 1, ret;

    /* perform system-dependent conversions for arguments list */
    prepare_app_arguments(&argc, &argv);

    /* parse options */
    optindex = 1;
    while (optindex < argc) {
        opt = argv[optindex++];

        if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
            if (opt[1] == '-' && opt[2] == '\0') {
                handleoptions = 0;
                continue;
            }
            opt++;

            if ((ret = parse_option(optctx, opt, argv[optindex], options)) < 0)
                exit(1);
            optindex += ret;
        } else {
            if (parse_arg_function)
                parse_arg_function(optctx, opt);
        }
    }
}

int parse_optgroup(void *optctx, OptionGroup *g)
{
    int i, ret;

    av_log(NULL, AV_LOG_DEBUG, "Parsing a group of options: %s %s.\n",
           g->group_def->name, g->arg);

    for (i = 0; i < g->nb_opts; i++) {
        Option *o = &g->opts[i];

        av_log(NULL, AV_LOG_DEBUG, "Applying option %s (%s) with argument %s.\n",
               o->key, o->opt->help, o->val);

        ret = write_option(optctx, o->opt, o->key, o->val);
        if (ret < 0)
            return ret;
    }

    av_log(NULL, AV_LOG_DEBUG, "Successfully parsed a group of options.\n");

    return 0;
}

int locate_option(int argc, char **argv, const OptionDef *options,
                  const char *optname)
{
    const OptionDef *po;
    int i;

    for (i = 1; i < argc; i++) {
        const char *cur_opt = argv[i];

        if (*cur_opt++ != '-')
            continue;

        po = find_option(options, cur_opt);
        if (!po->name && cur_opt[0] == 'n' && cur_opt[1] == 'o')
            po = find_option(options, cur_opt + 2);

        if ((!po->name && !strcmp(cur_opt, optname)) ||
             (po->name && !strcmp(optname, po->name)))
            return i;

        if (po->flags & HAS_ARG)
            i++;
    }
    return 0;
}

static void dump_argument(const char *a)
{
    const unsigned char *p;

    for (p = a; *p; p++)
        if (!((*p >= '+' && *p <= ':') || (*p >= '@' && *p <= 'Z') ||
              *p == '_' || (*p >= 'a' && *p <= 'z')))
            break;
    if (!*p) {
        fputs(a, report_file);
        return;
    }
    fputc('"', report_file);
    for (p = a; *p; p++) {
        if (*p == '\\' || *p == '"' || *p == '$' || *p == '`')
            fprintf(report_file, "\\%c", *p);
        else if (*p < ' ' || *p > '~')
            fprintf(report_file, "\\x%02x", *p);
        else
            fputc(*p, report_file);
    }
    fputc('"', report_file);
}

void parse_loglevel(int argc, char **argv, const OptionDef *options)
{
    int idx = locate_option(argc, argv, options, "loglevel");
    const char *env;
    if (!idx)
        idx = locate_option(argc, argv, options, "v");
    if (idx && argv[idx + 1])
        opt_loglevel(NULL, "loglevel", argv[idx + 1]);
    idx = locate_option(argc, argv, options, "report");
    if ((env = getenv("FFREPORT")) || idx) {
        init_report(env);
        if (report_file) {
            int i;
            fprintf(report_file, "Command line:\n");
            for (i = 0; i < argc; i++) {
                dump_argument(argv[i]);
                fputc(i < argc - 1 ? ' ' : '\n', report_file);
            }
            fflush(report_file);
        }
    }
}

#define FLAGS (o->type == AV_OPT_TYPE_FLAGS) ? AV_DICT_APPEND : 0
int opt_default(void *optctx, const char *opt, const char *arg)
{
    const AVOption *o;
    int consumed = 0;
    char opt_stripped[128];
    const char *p;
    const AVClass *cc = avcodec_get_class(), *fc = avformat_get_class();
    const AVClass *sc, *swr_class;

    if (!(p = strchr(opt, ':')))
        p = opt + strlen(opt);
    av_strlcpy(opt_stripped, opt, FFMIN(sizeof(opt_stripped), p - opt + 1));

    if ((o = av_opt_find(&cc, opt_stripped, NULL, 0,
                         AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) ||
        ((opt[0] == 'v' || opt[0] == 'a' || opt[0] == 's') &&
         (o = av_opt_find(&cc, opt + 1, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)))) {
        av_dict_set(&codec_opts, opt, arg, FLAGS);
        consumed = 1;
    }
    if ((o = av_opt_find(&fc, opt, NULL, 0,
                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
        av_dict_set(&format_opts, opt, arg, FLAGS);
        if(consumed)
            av_log(NULL, AV_LOG_VERBOSE, "Routing %s to codec and muxer layer\n", opt);
        consumed = 1;
    }
#if CONFIG_SWSCALE
    sc = sws_get_class();
    if (!consumed && av_opt_find(&sc, opt, NULL, 0,
                         AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
        // XXX we only support sws_flags, not arbitrary sws options
        int ret = av_opt_set(sws_opts, opt, arg, 0);
        if (ret < 0) {
            av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
            return ret;
        }
        consumed = 1;
    }
#endif
#if CONFIG_SWRESAMPLE
    swr_class = swr_get_class();
    if (!consumed && av_opt_find(&swr_class, opt, NULL, 0,
                               AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
        int ret = av_opt_set(swr_opts, opt, arg, 0);
        if (ret < 0) {
            av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
            return ret;
        }
        consumed = 1;
    }
#endif

    if (consumed)
        return 0;
    return AVERROR_OPTION_NOT_FOUND;
}

/*
 * Check whether given option is a group separator.
 *
 * @return index of the group definition that matched or -1 if none
 */
static int match_group_separator(const OptionGroupDef *groups, const char *opt)
{
    const OptionGroupDef *p = groups;

    while (p->name) {
        if (p->sep && !strcmp(p->sep, opt))
            return p - groups;
        p++;
    }

    return -1;
}

/*
 * Finish parsing an option group.
 *
 * @param group_idx which group definition should this group belong to
 * @param arg argument of the group delimiting option
 */
static void finish_group(OptionParseContext *octx, int group_idx,
                         const char *arg)
{
    OptionGroupList *l = &octx->groups[group_idx];
    OptionGroup *g;

    GROW_ARRAY(l->groups, l->nb_groups);
    g = &l->groups[l->nb_groups - 1];

    *g             = octx->cur_group;
    g->arg         = arg;
    g->group_def   = l->group_def;
#if CONFIG_SWSCALE
    g->sws_opts    = sws_opts;
#endif
    g->swr_opts    = swr_opts;
    g->codec_opts  = codec_opts;
    g->format_opts = format_opts;

    codec_opts  = NULL;
    format_opts = NULL;
#if CONFIG_SWSCALE
    sws_opts    = NULL;
#endif
    swr_opts    = NULL;
    init_opts();

    memset(&octx->cur_group, 0, sizeof(octx->cur_group));
}

/*
 * Add an option instance to currently parsed group.
 */
static void add_opt(OptionParseContext *octx, const OptionDef *opt,
                    const char *key, const char *val)
{
    int global = !(opt->flags & (OPT_PERFILE | OPT_SPEC | OPT_OFFSET));
    OptionGroup *g = global ? &octx->global_opts : &octx->cur_group;

    GROW_ARRAY(g->opts, g->nb_opts);
    g->opts[g->nb_opts - 1].opt = opt;
    g->opts[g->nb_opts - 1].key = key;
    g->opts[g->nb_opts - 1].val = val;
}

static void init_parse_context(OptionParseContext *octx,
                               const OptionGroupDef *groups)
{
    static const OptionGroupDef global_group = { "global" };
    const OptionGroupDef *g = groups;
    int i;

    memset(octx, 0, sizeof(*octx));

    while (g->name)
        g++;
    octx->nb_groups = g - groups;
    octx->groups    = av_mallocz(sizeof(*octx->groups) * octx->nb_groups);
    if (!octx->groups)
        exit(1);

    for (i = 0; i < octx->nb_groups; i++)
        octx->groups[i].group_def = &groups[i];

    octx->global_opts.group_def = &global_group;
    octx->global_opts.arg       = "";

    init_opts();
}

void uninit_parse_context(OptionParseContext *octx)
{
    int i, j;

    for (i = 0; i < octx->nb_groups; i++) {
        OptionGroupList *l = &octx->groups[i];

        for (j = 0; j < l->nb_groups; j++) {
            av_freep(&l->groups[j].opts);
            av_dict_free(&l->groups[j].codec_opts);
            av_dict_free(&l->groups[j].format_opts);
#if CONFIG_SWSCALE
            sws_freeContext(l->groups[j].sws_opts);
#endif
            if(CONFIG_SWRESAMPLE)
                swr_free(&l->groups[j].swr_opts);
        }
        av_freep(&l->groups);
    }
    av_freep(&octx->groups);

    av_freep(&octx->cur_group.opts);
    av_freep(&octx->global_opts.opts);

    uninit_opts();
}

int split_commandline(OptionParseContext *octx, int argc, char *argv[],
                      const OptionDef *options,
                      const OptionGroupDef *groups)
{
    int optindex = 1;

    /* perform system-dependent conversions for arguments list */
    prepare_app_arguments(&argc, &argv);

    init_parse_context(octx, groups);
    av_log(NULL, AV_LOG_DEBUG, "Splitting the commandline.\n");

    while (optindex < argc) {
        const char *opt = argv[optindex++], *arg;
        const OptionDef *po;
        int ret;

        av_log(NULL, AV_LOG_DEBUG, "Reading option '%s' ...", opt);

        /* unnamed group separators, e.g. output filename */
        if (opt[0] != '-' || !opt[1]) {
            finish_group(octx, 0, opt);
            av_log(NULL, AV_LOG_DEBUG, " matched as %s.\n", groups[0].name);
            continue;
        }
        opt++;

#define GET_ARG(arg)                                                           \
do {                                                                           \
    arg = argv[optindex++];                                                    \
    if (!arg) {                                                                \
        av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'.\n", opt);\
        return AVERROR(EINVAL);                                                \
    }                                                                          \
} while (0)

        /* named group separators, e.g. -i */
        if ((ret = match_group_separator(groups, opt)) >= 0) {
            GET_ARG(arg);
            finish_group(octx, ret, arg);
            av_log(NULL, AV_LOG_DEBUG, " matched as %s with argument '%s'.\n",
                   groups[ret].name, arg);
            continue;
        }

        /* normal options */
        po = find_option(options, opt);
        if (po->name) {
            if (po->flags & OPT_EXIT) {
                /* optional argument, e.g. -h */
                arg = argv[optindex++];
            } else if (po->flags & HAS_ARG) {
                GET_ARG(arg);
            } else {
                arg = "1";
            }

            add_opt(octx, po, opt, arg);
            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
                   "argument '%s'.\n", po->name, po->help, arg);
            continue;
        }

        /* AVOptions */
        if (argv[optindex]) {
            ret = opt_default(NULL, opt, argv[optindex]);
            if (ret >= 0) {
                av_log(NULL, AV_LOG_DEBUG, " matched as AVOption '%s' with "
                       "argument '%s'.\n", opt, argv[optindex]);
                optindex++;
                continue;
            } else if (ret != AVERROR_OPTION_NOT_FOUND) {
                av_log(NULL, AV_LOG_ERROR, "Error parsing option '%s' "
                       "with argument '%s'.\n", opt, argv[optindex]);
                return ret;
            }
        }

        /* boolean -nofoo options */
        if (opt[0] == 'n' && opt[1] == 'o' &&
            (po = find_option(options, opt + 2)) &&
            po->name && po->flags & OPT_BOOL) {
            add_opt(octx, po, opt, "0");
            av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
                   "argument 0.\n", po->name, po->help);
            continue;
        }

        av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'.\n", opt);
        return AVERROR_OPTION_NOT_FOUND;
    }

    if (octx->cur_group.nb_opts || codec_opts || format_opts)
        av_log(NULL, AV_LOG_WARNING, "Trailing options were found on the "
               "commandline.\n");

    av_log(NULL, AV_LOG_DEBUG, "Finished splitting the commandline.\n");

    return 0;
}

int opt_loglevel(void *optctx, const char *opt, const char *arg)
{
    const struct { const char *name; int level; } log_levels[] = {
        { "quiet"  , AV_LOG_QUIET   },
        { "panic"  , AV_LOG_PANIC   },
        { "fatal"  , AV_LOG_FATAL   },
        { "error"  , AV_LOG_ERROR   },
        { "warning", AV_LOG_WARNING },
        { "info"   , AV_LOG_INFO    },
        { "verbose", AV_LOG_VERBOSE },
        { "debug"  , AV_LOG_DEBUG   },
    };
    char *tail;
    int level;
    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
        if (!strcmp(log_levels[i].name, arg)) {
            av_log_set_level(log_levels[i].level);
            return 0;
        }
    }

    level = strtol(arg, &tail, 10);
    if (*tail) {
        av_log(NULL, AV_LOG_FATAL, "Invalid loglevel \"%s\". "
               "Possible levels are numbers or:\n", arg);
        for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
            av_log(NULL, AV_LOG_FATAL, "\"%s\"\n", log_levels[i].name);
        exit(1);
    }
    av_log_set_level(level);
    return 0;
}

static void expand_filename_template(AVBPrint *bp, const char *template,
                                     struct tm *tm)
{
    int c;

    while ((c = *(template++))) {
        if (c == '%') {
            if (!(c = *(template++)))
                break;
            switch (c) {
            case 'p':
                av_bprintf(bp, "%s", program_name);
                break;
            case 't':
                av_bprintf(bp, "%04d%02d%02d-%02d%02d%02d",
                           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
                           tm->tm_hour, tm->tm_min, tm->tm_sec);
                break;
            case '%':
                av_bprint_chars(bp, c, 1);
                break;
            }
        } else {
            av_bprint_chars(bp, c, 1);
        }
    }
}

static int init_report(const char *env)
{
    char *filename_template = NULL;
    char *key, *val;
    int ret, count = 0;
    time_t now;
    struct tm *tm;
    AVBPrint filename;

    if (report_file) /* already opened */
        return 0;
    time(&now);
    tm = localtime(&now);

    while (env && *env) {
        if ((ret = av_opt_get_key_value(&env, "=", ":", 0, &key, &val)) < 0) {
            if (count)
                av_log(NULL, AV_LOG_ERROR,
                       "Failed to parse FFREPORT environment variable: %s\n",
                       av_err2str(ret));
            break;
        }
        if (*env)
            env++;
        count++;
        if (!strcmp(key, "file")) {
            av_free(filename_template);
            filename_template = val;
            val = NULL;
        } else {
            av_log(NULL, AV_LOG_ERROR, "Unknown key '%s' in FFREPORT\n", key);
        }
        av_free(val);
        av_free(key);
    }

    av_bprint_init(&filename, 0, 1);
    expand_filename_template(&filename,
                             av_x_if_null(filename_template, "%p-%t.log"), tm);
    av_free(filename_template);
    if (!av_bprint_is_complete(&filename)) {
        av_log(NULL, AV_LOG_ERROR, "Out of memory building report file name\n");
        return AVERROR(ENOMEM);
    }

    report_file = fopen(filename.str, "w");
    if (!report_file) {
        av_log(NULL, AV_LOG_ERROR, "Failed to open report \"%s\": %s\n",
               filename.str, strerror(errno));
        return AVERROR(errno);
    }
    av_log_set_callback(log_callback_report);
    av_log(NULL, AV_LOG_INFO,
           "%s started on %04d-%02d-%02d at %02d:%02d:%02d\n"
           "Report written to \"%s\"\n",
           program_name,
           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
           tm->tm_hour, tm->tm_min, tm->tm_sec,
           filename.str);
    av_log_set_level(FFMAX(av_log_get_level(), AV_LOG_VERBOSE));
    av_bprint_finalize(&filename, NULL);
    return 0;
}

int opt_report(const char *opt)
{
    return init_report(NULL);
}

int opt_max_alloc(void *optctx, const char *opt, const char *arg)
{
    char *tail;
    size_t max;

    max = strtol(arg, &tail, 10);
    if (*tail) {
        av_log(NULL, AV_LOG_FATAL, "Invalid max_alloc \"%s\".\n", arg);
        exit(1);
    }
    av_max_alloc(max);
    return 0;
}

int opt_cpuflags(void *optctx, const char *opt, const char *arg)
{
    int ret;
    unsigned flags = av_get_cpu_flags();

    if ((ret = av_parse_cpu_caps(&flags, arg)) < 0)
        return ret;

    av_force_cpu_flags(flags);
    return 0;
}

int opt_codec_debug(void *optctx, const char *opt, const char *arg)
{
    av_log_set_level(AV_LOG_DEBUG);
    return opt_default(NULL, opt, arg);
}

int opt_timelimit(void *optctx, const char *opt, const char *arg)
{
#if HAVE_SETRLIMIT
    int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
    struct rlimit rl = { lim, lim + 1 };
    if (setrlimit(RLIMIT_CPU, &rl))
        perror("setrlimit");
#else
    av_log(NULL, AV_LOG_WARNING, "-%s not implemented on this OS\n", opt);
#endif
    return 0;
}

void print_error(const char *filename, int err)
{
    char errbuf[128];
    const char *errbuf_ptr = errbuf;

    if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
        errbuf_ptr = strerror(AVUNERROR(err));
    av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
}

static int warned_cfg = 0;

#define INDENT        1
#define SHOW_VERSION  2
#define SHOW_CONFIG   4
#define SHOW_COPYRIGHT 8

#define PRINT_LIB_INFO(libname, LIBNAME, flags, level)                  \
    if (CONFIG_##LIBNAME) {                                             \
        const char *indent = flags & INDENT? "  " : "";                 \
        if (flags & SHOW_VERSION) {                                     \
            unsigned int version = libname##_version();                 \
            av_log(NULL, level,                                         \
                   "%slib%-11s %2d.%3d.%3d / %2d.%3d.%3d\n",            \
                   indent, #libname,                                    \
                   LIB##LIBNAME##_VERSION_MAJOR,                        \
                   LIB##LIBNAME##_VERSION_MINOR,                        \
                   LIB##LIBNAME##_VERSION_MICRO,                        \
                   version >> 16, version >> 8 & 0xff, version & 0xff); \
        }                                                               \
        if (flags & SHOW_CONFIG) {                                      \
            const char *cfg = libname##_configuration();                \
            if (strcmp(FFMPEG_CONFIGURATION, cfg)) {                    \
                if (!warned_cfg) {                                      \
                    av_log(NULL, level,                                 \
                            "%sWARNING: library configuration mismatch\n", \
                            indent);                                    \
                    warned_cfg = 1;                                     \
                }                                                       \
                av_log(NULL, level, "%s%-11s configuration: %s\n",      \
                        indent, #libname, cfg);                         \
            }                                                           \
        }                                                               \
    }                                                                   \

static void print_all_libs_info(int flags, int level)
{
    PRINT_LIB_INFO(avutil,   AVUTIL,   flags, level);
    PRINT_LIB_INFO(avcodec,  AVCODEC,  flags, level);
    PRINT_LIB_INFO(avformat, AVFORMAT, flags, level);
    PRINT_LIB_INFO(avdevice, AVDEVICE, flags, level);
    PRINT_LIB_INFO(avfilter, AVFILTER, flags, level);
//    PRINT_LIB_INFO(avresample, AVRESAMPLE, flags, level);
    PRINT_LIB_INFO(swscale,  SWSCALE,  flags, level);
    PRINT_LIB_INFO(swresample,SWRESAMPLE,  flags, level);
#if CONFIG_POSTPROC
    PRINT_LIB_INFO(postproc, POSTPROC, flags, level);
#endif
}

static void print_program_info(int flags, int level)
{
    const char *indent = flags & INDENT? "  " : "";

    av_log(NULL, level, "%s version " FFMPEG_VERSION, program_name);
    if (flags & SHOW_COPYRIGHT)
        av_log(NULL, level, " Copyright (c) %d-%d the FFmpeg developers",
               program_birth_year, this_year);
    av_log(NULL, level, "\n");
    av_log(NULL, level, "%sbuilt on %s %s with %s\n",