/*
  * 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 <stdint.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"

 #include "libpostproc/postprocess.h"

 #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 "libavutil/cpu.h"

 #include "libavutil/ffversion.h"

 #include "cmdutils.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;

 AVDictionary *swr_opts;

 AVDictionary *format_opts, *codec_opts, *resample_opts;

 static FILE *report_file;

 static int report_file_level = AV_LOG_DEBUG;

 int hide_banner = 0;

 void init_opts(void)
 {

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

                               NULL, NULL, NULL);

 }
 
 void uninit_opts(void)
 {

 #if CONFIG_SWSCALE

     sws_freeContext(sws_opts);
     sws_opts = NULL;

 #endif

     av_dict_free(&swr_opts);

     av_dict_free(&format_opts);

     av_dict_free(&codec_opts);

     av_dict_free(&resample_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);

     if (report_file_level >= level) {
         fputs(line, report_file);
         fflush(report_file);
     }

 }
 

 static void (*program_exit)(int ret);
 
 void register_exit(void (*cb)(int ret))
 {
     program_exit = cb;
 }
 
 void exit_program(int ret)
 {
     if (program_exit)
         program_exit(ret);
 
     exit(ret);
 }
 

 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_program(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_program(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; 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) {

         if (!strncmp(name, po->name, len) && strlen(po->name) == len)

             break;
         po++;
     }
     return po;
 }
 

 /* _WIN32 means using the windows libc - cygwin doesn't define that
  * by default. HAVE_COMMANDLINETOARGVW is true on cygwin, while
  * it doesn't provide the actual command line via GetCommandLineW(). */
 #if HAVE_COMMANDLINETOARGVW && defined(_WIN32)

 #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) {

         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': %s\n",
                    arg, opt, av_err2str(ret));

             return ret;
         }
     }
     if (po->flags & OPT_EXIT)

         exit_program(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_program(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];
 

         if (g->group_def->flags &&
             !(g->group_def->flags & o->opt->flags)) {
             av_log(NULL, AV_LOG_ERROR, "Option %s (%s) cannot be applied to "
                    "%s %s -- you are trying to apply an input option to an "
                    "output file or vice versa. Move this option before the "
                    "file it belongs to.\n", o->key, o->opt->help,
                    g->group_def->name, g->arg);
             return AVERROR(EINVAL);
         }
 

         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->name || 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);
         }
     }

     idx = locate_option(argc, argv, options, "hide_banner");
     if (idx)
         hide_banner = 1;

 }
 

 static const AVOption *opt_find(void *obj, const char *name, const char *unit,
                             int opt_flags, int search_flags)
 {

     const AVOption *o = av_opt_find(obj, name, unit, opt_flags, search_flags);

     if(o && !o->flags)
         return NULL;
     return o;
 }
 

 #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();

 #if CONFIG_AVRESAMPLE

     const AVClass *rc = avresample_get_class();

 #endif

     const AVClass *sc, *swr_class;

     if (!strcmp(opt, "debug") || !strcmp(opt, "fdebug"))
         av_log_set_level(AV_LOG_DEBUG);
 

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

     if ((o = 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 = opt_find(&cc, opt + 1, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)))) {

         av_dict_set(&codec_opts, opt, arg, FLAGS);

         consumed = 1;
     }

     if ((o = 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 option %s to both codec and muxer layer\n", opt);

         consumed = 1;
     }

 #if CONFIG_SWSCALE

     sc = sws_get_class();

     if (!consumed && 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;

     }

 #else
     if (!consumed && !strcmp(opt, "sws_flags")) {
         av_log(NULL, AV_LOG_WARNING, "Ignoring %s %s, due to disabled swscale\n", opt, arg);
         consumed = 1;
     }

 #endif

 #if CONFIG_SWRESAMPLE

     swr_class = swr_get_class();

     if (!consumed && (o=opt_find(&swr_class, opt, NULL, 0,

                                     AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
         struct SwrContext *swr = swr_alloc();
         int ret = av_opt_set(swr, opt, arg, 0);
         swr_free(&swr);

         if (ret < 0) {
             av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
             return ret;
         }

         av_dict_set(&swr_opts, opt, arg, FLAGS);

         consumed = 1;

     }

 #endif

 #if CONFIG_AVRESAMPLE

     if ((o=opt_find(&rc, opt, NULL, 0,

                        AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {

         av_dict_set(&resample_opts, opt, arg, FLAGS);
         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, int nb_groups,
                                  const char *opt)

 {

     int i;

     for (i = 0; i < nb_groups; i++) {
         const OptionGroupDef *p = &groups[i];

         if (p->sep && !strcmp(p->sep, opt))

             return i;

     }
 
     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;

     g->resample_opts = resample_opts;

 
     codec_opts  = NULL;
     format_opts = NULL;

     resample_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, int nb_groups)

 {
     static const OptionGroupDef global_group = { "global" };
     int i;
 
     memset(octx, 0, sizeof(*octx));
 

     octx->nb_groups = nb_groups;

     octx->groups    = av_mallocz_array(octx->nb_groups, sizeof(*octx->groups));

     if (!octx->groups)

         exit_program(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);

             av_dict_free(&l->groups[j].resample_opts);

 #if CONFIG_SWSCALE
             sws_freeContext(l->groups[j].sws_opts);
 #endif

             av_dict_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 nb_groups)

 {
     int optindex = 1;

     int dashdash = -2;

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

     init_parse_context(octx, groups, nb_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);
 

         if (opt[0] == '-' && opt[1] == '-' && !opt[2]) {
             dashdash = optindex;
             continue;
         }

         /* unnamed group separators, e.g. output filename */

         if (opt[0] != '-' || !opt[1] || dashdash+1 == optindex) {

             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, nb_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 || resample_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_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_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 flags;

     int i;
 

     flags = av_log_get_flags();

     tail = strstr(arg, "repeat");

     if (tail)
         flags &= ~AV_LOG_SKIP_REPEATED;
     else
         flags |= AV_LOG_SKIP_REPEATED;
 
     av_log_set_flags(flags);

     if (tail == arg)
         arg += 6 + (arg[6]=='+');
     if(tail && !*arg)
         return 0;
 

     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_program(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 if (!strcmp(key, "level")) {
             char *tail;
             report_file_level = strtol(val, &tail, 10);
             if (*tail) {
                 av_log(NULL, AV_LOG_FATAL, "Invalid report file level\n");
                 exit_program(1);
             }

         } 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_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_program(1);

     }
     av_max_alloc(max);
     return 0;
 }
 

 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);

     PRINT_LIB_INFO(postproc, POSTPROC, flags, level);

 }
 

 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, CONFIG_THIS_YEAR);

     av_log(NULL, level, "\n");

     av_log(NULL, level, "%sbuilt on %s %s with %s\n",
            indent, __DATE__, __TIME__, CC_IDENT);
 

     av_log(NULL, level, "%sconfiguration: " FFMPEG_CONFIGURATION "\n", indent);
 }
 

 static void print_buildconf(int flags, int level)
 {

     const char *indent = flags & INDENT ? "  " : "";

     char str[] = { FFMPEG_CONFIGURATION };
     char *conflist, *remove_tilde, *splitconf;
 
     // Change all the ' --' strings to '~--' so that
     // they can be identified as tokens.

     while ((conflist = strstr(str, " --")) != NULL) {

         strncpy(conflist, "~--", 3);
     }
 
     // Compensate for the weirdness this would cause
     // when passing 'pkg-config --static'.

     while ((remove_tilde = strstr(str, "pkg-config~")) != NULL) {
         strncpy(remove_tilde, "pkg-config ", 11);

     }
 
     splitconf = strtok(str, "~");

     av_log(NULL, level, "\n%sconfiguration:\n", indent);

     while (splitconf != NULL) {

         av_log(NULL, level, "%s%s%s\n", indent, indent, splitconf);
         splitconf = strtok(NULL, "~");
     }
 }
 

 void show_banner(int argc, char **argv, const OptionDef *options)

 {

     int idx = locate_option(argc, argv, options, "version");

     if (hide_banner || idx)

         return;
 

     print_program_info (INDENT|SHOW_COPYRIGHT, AV_LOG_INFO);

     print_all_libs_info(INDENT|SHOW_CONFIG,  AV_LOG_INFO);
     print_all_libs_info(INDENT|SHOW_VERSION, AV_LOG_INFO);

 }
 

 int show_version(void *optctx, const char *opt, const char *arg)

 {

     av_log_set_callback(log_callback_help);

     print_program_info (SHOW_COPYRIGHT, AV_LOG_INFO);

     print_all_libs_info(SHOW_VERSION, AV_LOG_INFO);

     return 0;

 }
 

 int show_buildconf(void *optctx, const char *opt, const char *arg)
 {
     av_log_set_callback(log_callback_help);
     print_buildconf      (INDENT|0, AV_LOG_INFO);
 
     return 0;
 }
 

 int show_license(void *optctx, const char *opt, const char *arg)

 {

 #if CONFIG_NONFREE

     printf(

     "This version of %s has nonfree parts compiled in.\n"
     "Therefore it is not legally redistributable.\n",

     program_name );

 #elif CONFIG_GPLV3

     printf(

     "%s is free software; you can redistribute it and/or modify\n"
     "it under the terms of the GNU General Public License as published by\n"
     "the Free Software Foundation; either version 3 of the License, or\n"
     "(at your option) any later version.\n"
     "\n"
     "%s is distributed in the hope that it will be useful,\n"
     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
     "GNU General Public License for more details.\n"
     "\n"
     "You should have received a copy of the GNU General Public License\n"
     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",

     program_name, program_name, program_name );

 #elif CONFIG_GPL

     printf(

     "%s is free software; you can redistribute it and/or modify\n"

     "it under the terms of the GNU General Public License as published by\n"
     "the Free Software Foundation; either version 2 of the License, or\n"
     "(at your option) any later version.\n"
     "\n"

     "%s is distributed in the hope that it will be useful,\n"

     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
     "GNU General Public License for more details.\n"
     "\n"
     "You should have received a copy of the GNU General Public License\n"

     "along with %s; if not, write to the Free Software\n"
     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",

     program_name, program_name, program_name );

 #elif CONFIG_LGPLV3

     printf(

     "%s is free software; you can redistribute it and/or modify\n"
     "it under the terms of the GNU Lesser General Public License as published by\n"
     "the Free Software Foundation; either version 3 of the License, or\n"
     "(at your option) any later version.\n"
     "\n"
     "%s is distributed in the hope that it will be useful,\n"
     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
     "GNU Lesser General Public License for more details.\n"
     "\n"
     "You should have received a copy of the GNU Lesser General Public License\n"
     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",

     program_name, program_name, program_name );

 #else

     printf(

     "%s is free software; you can redistribute it and/or\n"

     "modify it under the terms of the GNU Lesser General Public\n"
     "License as published by the Free Software Foundation; either\n"
     "version 2.1 of the License, or (at your option) any later version.\n"
     "\n"

     "%s is distributed in the hope that it will be useful,\n"

     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
     "Lesser General Public License for more details.\n"
     "\n"
     "You should have received a copy of the GNU Lesser General Public\n"

     "License along with %s; if not, write to the Free Software\n"
     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",

     program_name, program_name, program_name );

 #endif

     return 0;

 }

 static int is_device(const AVClass *avclass)
 {
     if (!avclass)
         return 0;
     return avclass->category == AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT ||
            avclass->category == AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT ||
            avclass->category == AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT ||
            avclass->category == AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT ||
            avclass->category == AV_CLASS_CATEGORY_DEVICE_OUTPUT ||
            avclass->category == AV_CLASS_CATEGORY_DEVICE_INPUT;
 }
 
 static int show_formats_devices(void *optctx, const char *opt, const char *arg, int device_only)

 {

     AVInputFormat *ifmt  = NULL;
     AVOutputFormat *ofmt = NULL;

     const char *last_name;

     int is_dev;

     printf("%s\n"

            " D. = Demuxing supported\n"
            " .E = Muxing supported\n"

            " --\n", device_only ? "Devices:" : "File formats:");

     last_name = "000";
     for (;;) {
         int decode = 0;
         int encode = 0;
         const char *name      = NULL;
         const char *long_name = NULL;
 
         while ((ofmt = av_oformat_next(ofmt))) {

             is_dev = is_device(ofmt->priv_class);
             if (!is_dev && device_only)
                 continue;

             if ((!name || strcmp(ofmt->name, name) < 0) &&

                 strcmp(ofmt->name, last_name) > 0) {
                 name      = ofmt->name;
                 long_name = ofmt->long_name;
                 encode    = 1;

             }
         }

         while ((ifmt = av_iformat_next(ifmt))) {

             is_dev = is_device(ifmt->priv_class);
             if (!is_dev && device_only)
                 continue;

             if ((!name || strcmp(ifmt->name, name) < 0) &&

                 strcmp(ifmt->name, last_name) > 0) {
                 name      = ifmt->name;
                 long_name = ifmt->long_name;
                 encode    = 0;

             }

             if (name && strcmp(ifmt->name, name) == 0)
                 decode = 1;

         }

         if (!name)

             break;

         last_name = name;

         printf(" %s%s %-15s %s\n",
                decode ? "D" : " ",
                encode ? "E" : " ",
                name,

             long_name ? long_name:" ");
     }

     return 0;

 }

 int show_formats(void *optctx, const char *opt, const char *arg)
 {
     return show_formats_devices(optctx, opt, arg, 0);
 }
 
 int show_devices(void *optctx, const char *opt, const char *arg)
 {
     return show_formats_devices(optctx, opt, arg, 1);
 }
 

 #define PRINT_CODEC_SUPPORTED(codec, field, type, list_name, term, get_name) \
     if (codec->field) {                                                      \

         const type *p = codec->field;                                        \

                                                                              \
         printf("    Supported " list_name ":");                              \
         while (*p != term) {                                                 \
             get_name(*p);                                                    \
             printf(" %s", name);                                             \
             p++;                                                             \
         }                                                                    \
         printf("\n");                                                        \
     }                                                                        \
 
 static void print_codec(const AVCodec *c)
 {
     int encoder = av_codec_is_encoder(c);
 
     printf("%s %s [%s]:\n", encoder ? "Encoder" : "Decoder", c->name,
            c->long_name ? c->long_name : "");
 

     if (c->type == AVMEDIA_TYPE_VIDEO ||
         c->type == AVMEDIA_TYPE_AUDIO) {

         printf("    Threading capabilities: ");
         switch (c->capabilities & (CODEC_CAP_FRAME_THREADS |
                                    CODEC_CAP_SLICE_THREADS)) {
         case CODEC_CAP_FRAME_THREADS |
              CODEC_CAP_SLICE_THREADS: printf("frame and slice"); break;
         case CODEC_CAP_FRAME_THREADS: printf("frame");           break;
         case CODEC_CAP_SLICE_THREADS: printf("slice");           break;
         default:                      printf("no");              break;
         }
         printf("\n");
     }
 
     if (c->supported_framerates) {
         const AVRational *fps = c->supported_framerates;
 
         printf("    Supported framerates:");
         while (fps->num) {
             printf(" %d/%d", fps->num, fps->den);
             fps++;
         }
         printf("\n");
     }

     PRINT_CODEC_SUPPORTED(c, pix_fmts, enum AVPixelFormat, "pixel formats",
                           AV_PIX_FMT_NONE, GET_PIX_FMT_NAME);

     PRINT_CODEC_SUPPORTED(c, supported_samplerates, int, "sample rates", 0,
                           GET_SAMPLE_RATE_NAME);
     PRINT_CODEC_SUPPORTED(c, sample_fmts, enum AVSampleFormat, "sample formats",
                           AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME);
     PRINT_CODEC_SUPPORTED(c, channel_layouts, uint64_t, "channel layouts",
                           0, GET_CH_LAYOUT_DESC);
 
     if (c->priv_class) {
         show_help_children(c->priv_class,
                            AV_OPT_FLAG_ENCODING_PARAM |
                            AV_OPT_FLAG_DECODING_PARAM);
     }
 }
 

 static char get_media_type_char(enum AVMediaType type)
 {

     switch (type) {
         case AVMEDIA_TYPE_VIDEO:    return 'V';
         case AVMEDIA_TYPE_AUDIO:    return 'A';

         case AVMEDIA_TYPE_DATA:     return 'D';

         case AVMEDIA_TYPE_SUBTITLE: return 'S';

         case AVMEDIA_TYPE_ATTACHMENT:return 'T';

         default:                    return '?';
     }

 }
 

 static const AVCodec *next_codec_for_id(enum AVCodecID id, const AVCodec *prev,
                                         int encoder)

 {

     while ((prev = av_codec_next(prev))) {
         if (prev->id == id &&
             (encoder ? av_codec_is_encoder(prev) : av_codec_is_decoder(prev)))
             return prev;
     }
     return NULL;
 }
 

 static int compare_codec_desc(const void *a, const void *b)
 {
     const AVCodecDescriptor * const *da = a;
     const AVCodecDescriptor * const *db = b;
 
     return (*da)->type != (*db)->type ? (*da)->type - (*db)->type :
            strcmp((*da)->name, (*db)->name);
 }
 
 static unsigned get_codecs_sorted(const AVCodecDescriptor ***rcodecs)
 {
     const AVCodecDescriptor *desc = NULL;
     const AVCodecDescriptor **codecs;
     unsigned nb_codecs = 0, i = 0;
 
     while ((desc = avcodec_descriptor_next(desc)))
         nb_codecs++;
     if (!(codecs = av_calloc(nb_codecs, sizeof(*codecs)))) {

         av_log(NULL, AV_LOG_ERROR, "Out of memory\n");

         exit_program(1);

     }
     desc = NULL;
     while ((desc = avcodec_descriptor_next(desc)))
         codecs[i++] = desc;
     av_assert0(i == nb_codecs);
     qsort(codecs, nb_codecs, sizeof(*codecs), compare_codec_desc);
     *rcodecs = codecs;
     return nb_codecs;
 }
 

 static void print_codecs_for_id(enum AVCodecID id, int encoder)
 {
     const AVCodec *codec = NULL;
 
     printf(" (%s: ", encoder ? "encoders" : "decoders");
 
     while ((codec = next_codec_for_id(id, codec, encoder)))
         printf("%s ", codec->name);
 
     printf(")");
 }
 

 int show_codecs(void *optctx, const char *opt, const char *arg)

 {

     const AVCodecDescriptor **codecs;
     unsigned i, nb_codecs = get_codecs_sorted(&codecs);

     printf("Codecs:\n"

            " D..... = Decoding supported\n"
            " .E.... = Encoding supported\n"
            " ..V... = Video codec\n"
            " ..A... = Audio codec\n"
            " ..S... = Subtitle codec\n"
            " ...I.. = Intra frame-only codec\n"
            " ....L. = Lossy compression\n"
            " .....S = Lossless compression\n"
            " -------\n");

     for (i = 0; i < nb_codecs; i++) {
         const AVCodecDescriptor *desc = codecs[i];

         const AVCodec *codec = NULL;
 

         if (strstr(desc->name, "_deprecated"))
             continue;
 

         printf(" ");

         printf(avcodec_find_decoder(desc->id) ? "D" : ".");
         printf(avcodec_find_encoder(desc->id) ? "E" : ".");
 
         printf("%c", get_media_type_char(desc->type));
         printf((desc->props & AV_CODEC_PROP_INTRA_ONLY) ? "I" : ".");

         printf((desc->props & AV_CODEC_PROP_LOSSY)      ? "L" : ".");
         printf((desc->props & AV_CODEC_PROP_LOSSLESS)   ? "S" : ".");

 
         printf(" %-20s %s", desc->name, desc->long_name ? desc->long_name : "");
 
         /* print decoders/encoders when there's more than one or their
          * names are different from codec name */
         while ((codec = next_codec_for_id(desc->id, codec, 0))) {
             if (strcmp(codec->name, desc->name)) {
                 print_codecs_for_id(desc->id, 0);
                 break;

             }

         }
         codec = NULL;
         while ((codec = next_codec_for_id(desc->id, codec, 1))) {
             if (strcmp(codec->name, desc->name)) {
                 print_codecs_for_id(desc->id, 1);
                 break;

             }
         }
 
         printf("\n");
     }

     av_free(codecs);

     return 0;

 }
 
 static void print_codecs(int encoder)
 {

     const AVCodecDescriptor **codecs;
     unsigned i, nb_codecs = get_codecs_sorted(&codecs);

 
     printf("%s:\n"

            " V..... = Video\n"
            " A..... = Audio\n"
            " S..... = Subtitle\n"
            " .F.... = Frame-level multithreading\n"
            " ..S... = Slice-level multithreading\n"
            " ...X.. = Codec is experimental\n"
            " ....B. = Supports draw_horiz_band\n"
            " .....D = Supports direct rendering method 1\n"
            " ------\n",

            encoder ? "Encoders" : "Decoders");

     for (i = 0; i < nb_codecs; i++) {
         const AVCodecDescriptor *desc = codecs[i];

         const AVCodec *codec = NULL;
 
         while ((codec = next_codec_for_id(desc->id, codec, encoder))) {

             printf(" %c", get_media_type_char(desc->type));

             printf((codec->capabilities & CODEC_CAP_FRAME_THREADS) ? "F" : ".");
             printf((codec->capabilities & CODEC_CAP_SLICE_THREADS) ? "S" : ".");
             printf((codec->capabilities & CODEC_CAP_EXPERIMENTAL)  ? "X" : ".");

             printf((codec->capabilities & CODEC_CAP_DRAW_HORIZ_BAND)?"B" : ".");
             printf((codec->capabilities & CODEC_CAP_DR1)           ? "D" : ".");

 
             printf(" %-20s %s", codec->name, codec->long_name ? codec->long_name : "");
             if (strcmp(codec->name, desc->name))
                 printf(" (codec %s)", desc->name);
 
             printf("\n");
         }
     }

     av_free(codecs);

 }
 

 int show_decoders(void *optctx, const char *opt, const char *arg)

 {
     print_codecs(0);
     return 0;
 }
 

 int show_encoders(void *optctx, const char *opt, const char *arg)

 {
     print_codecs(1);

     return 0;

 }
 

 int show_bsfs(void *optctx, const char *opt, const char *arg)

 {

     AVBitStreamFilter *bsf = NULL;

 
     printf("Bitstream filters:\n");

     while ((bsf = av_bitstream_filter_next(bsf)))

         printf("%s\n", bsf->name);

     printf("\n");

     return 0;

 }
 

 int show_protocols(void *optctx, const char *opt, const char *arg)

 {

     void *opaque = NULL;
     const char *name;

     printf("Supported file protocols:\n"

            "Input:\n");
     while ((name = avio_enum_protocols(&opaque, 0)))
         printf("%s\n", name);
     printf("Output:\n");
     while ((name = avio_enum_protocols(&opaque, 1)))
         printf("%s\n", name);

     return 0;

 }

 int show_filters(void *optctx, const char *opt, const char *arg)

 {

     const AVFilter av_unused(*filter) = NULL;

     char descr[64], *descr_cur;
     int i, j;
     const AVFilterPad *pad;

     printf("Filters:\n"

            "  T.. = Timeline support\n"
            "  .S. = Slice threading\n"
            "  ..C = Commmand support\n"

            "  A = Audio input/output\n"
            "  V = Video input/output\n"
            "  N = Dynamic number and/or type of input/output\n"
            "  | = Source or sink filter\n");

 #if CONFIG_AVFILTER

     while ((filter = avfilter_next(filter))) {

         descr_cur = descr;
         for (i = 0; i < 2; i++) {
             if (i) {
                 *(descr_cur++) = '-';
                 *(descr_cur++) = '>';
             }

             pad = i ? filter->outputs : filter->inputs;

             for (j = 0; pad && pad[j].name; j++) {

                 if (descr_cur >= descr + sizeof(descr) - 4)
                     break;
                 *(descr_cur++) = get_media_type_char(pad[j].type);
             }
             if (!j)

                 *(descr_cur++) = ((!i && (filter->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)) ||
                                   ( i && (filter->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS))) ? 'N' : '|';

         }
         *descr_cur = 0;

         printf(" %c%c%c %-16s %-10s %s\n",

                filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE ? 'T' : '.',
                filter->flags & AVFILTER_FLAG_SLICE_THREADS    ? 'S' : '.',

                filter->process_command                        ? 'C' : '.',

                filter->name, descr, filter->description);

     }

 #endif

     return 0;

 }
 

 int show_colors(void *optctx, const char *opt, const char *arg)

 {
     const char *name;
     const uint8_t *rgb;
     int i;
 
     printf("%-32s #RRGGBB\n", "name");
 
     for (i = 0; name = av_get_known_color_name(i, &rgb); i++)
         printf("%-32s #%02x%02x%02x\n", name, rgb[0], rgb[1], rgb[2]);

 
     return 0;

 }
 

 int show_pix_fmts(void *optctx, const char *opt, const char *arg)

 {

     const AVPixFmtDescriptor *pix_desc = NULL;

     printf("Pixel formats:\n"
            "I.... = Supported Input  format for conversion\n"
            ".O... = Supported Output format for conversion\n"
            "..H.. = Hardware accelerated format\n"
            "...P. = Paletted format\n"
            "....B = Bitstream format\n"
            "FLAGS NAME            NB_COMPONENTS BITS_PER_PIXEL\n"
            "-----\n");

 #if !CONFIG_SWSCALE
 #   define sws_isSupportedInput(x)  0
 #   define sws_isSupportedOutput(x) 0
 #endif
 

     while ((pix_desc = av_pix_fmt_desc_next(pix_desc))) {
         enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(pix_desc);

         printf("%c%c%c%c%c %-16s       %d            %2d\n",

                sws_isSupportedInput (pix_fmt)              ? 'I' : '.',
                sws_isSupportedOutput(pix_fmt)              ? 'O' : '.',
                pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL   ? 'H' : '.',
                pix_desc->flags & AV_PIX_FMT_FLAG_PAL       ? 'P' : '.',
                pix_desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ? 'B' : '.',

                pix_desc->name,
                pix_desc->nb_components,
                av_get_bits_per_pixel(pix_desc));
     }

     return 0;

 }
 

 int show_layouts(void *optctx, const char *opt, const char *arg)

 {
     int i = 0;
     uint64_t layout, j;
     const char *name, *descr;
 
     printf("Individual channels:\n"

            "NAME           DESCRIPTION\n");

     for (i = 0; i < 63; i++) {
         name = av_get_channel_name((uint64_t)1 << i);
         if (!name)
             continue;
         descr = av_get_channel_description((uint64_t)1 << i);

         printf("%-14s %s\n", name, descr);

     }
     printf("\nStandard channel layouts:\n"

            "NAME           DECOMPOSITION\n");

     for (i = 0; !av_get_standard_channel_layout(i, &layout, &name); i++) {
         if (name) {

             printf("%-14s ", name);

             for (j = 1; j; j <<= 1)
                 if ((layout & j))
                     printf("%s%s", (layout & (j - 1)) ? "+" : "", av_get_channel_name(j));
             printf("\n");
         }
     }
     return 0;
 }
 

 int show_sample_fmts(void *optctx, const char *opt, const char *arg)

 {
     int i;
     char fmt_str[128];
     for (i = -1; i < AV_SAMPLE_FMT_NB; i++)
         printf("%s\n", av_get_sample_fmt_string(fmt_str, sizeof(fmt_str), i));
     return 0;
 }
 

 static void show_help_codec(const char *name, int encoder)
 {
     const AVCodecDescriptor *desc;
     const AVCodec *codec;
 
     if (!name) {
         av_log(NULL, AV_LOG_ERROR, "No codec name specified.\n");
         return;
     }
 
     codec = encoder ? avcodec_find_encoder_by_name(name) :
                       avcodec_find_decoder_by_name(name);
 
     if (codec)
         print_codec(codec);
     else if ((desc = avcodec_descriptor_get_by_name(name))) {
         int printed = 0;
 
         while ((codec = next_codec_for_id(desc->id, codec, encoder))) {
             printed = 1;
             print_codec(codec);
         }
 
         if (!printed) {

             av_log(NULL, AV_LOG_ERROR, "Codec '%s' is known to FFmpeg, "
                    "but no %s for it are available. FFmpeg might need to be "

                    "recompiled with additional external libraries.\n",
                    name, encoder ? "encoders" : "decoders");
         }
     } else {

         av_log(NULL, AV_LOG_ERROR, "Codec '%s' is not recognized by FFmpeg.\n",

                name);
     }
 }
 

 static void show_help_demuxer(const char *name)
 {
     const AVInputFormat *fmt = av_find_input_format(name);
 
     if (!fmt) {
         av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
         return;
     }
 
     printf("Demuxer %s [%s]:\n", fmt->name, fmt->long_name);
 
     if (fmt->extensions)
         printf("    Common extensions: %s.\n", fmt->extensions);
 
     if (fmt->priv_class)
         show_help_children(fmt->priv_class, AV_OPT_FLAG_DECODING_PARAM);
 }
 
 static void show_help_muxer(const char *name)
 {
     const AVCodecDescriptor *desc;
     const AVOutputFormat *fmt = av_guess_format(name, NULL, NULL);
 
     if (!fmt) {
         av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
         return;
     }
 
     printf("Muxer %s [%s]:\n", fmt->name, fmt->long_name);
 
     if (fmt->extensions)
         printf("    Common extensions: %s.\n", fmt->extensions);
     if (fmt->mime_type)
         printf("    Mime type: %s.\n", fmt->mime_type);
     if (fmt->video_codec != AV_CODEC_ID_NONE &&
         (desc = avcodec_descriptor_get(fmt->video_codec))) {
         printf("    Default video codec: %s.\n", desc->name);
     }
     if (fmt->audio_codec != AV_CODEC_ID_NONE &&
         (desc = avcodec_descriptor_get(fmt->audio_codec))) {
         printf("    Default audio codec: %s.\n", desc->name);
     }
     if (fmt->subtitle_codec != AV_CODEC_ID_NONE &&
         (desc = avcodec_descriptor_get(fmt->subtitle_codec))) {
         printf("    Default subtitle codec: %s.\n", desc->name);
     }
 
     if (fmt->priv_class)
         show_help_children(fmt->priv_class, AV_OPT_FLAG_ENCODING_PARAM);
 }
 

 #if CONFIG_AVFILTER

 static void show_help_filter(const char *name)
 {

 #if CONFIG_AVFILTER

     const AVFilter *f = avfilter_get_by_name(name);
     int i, count;

 
     if (!name) {
         av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
         return;

     } else if (!f) {
         av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);

         return;
     }

     printf("Filter %s\n", f->name);
     if (f->description)
         printf("  %s\n", f->description);

 
     if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
         printf("    slice threading supported\n");

 
     printf("    Inputs:\n");
     count = avfilter_pad_count(f->inputs);
     for (i = 0; i < count; i++) {

         printf("       #%d: %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),

                media_type_string(avfilter_pad_get_type(f->inputs, i)));
     }
     if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
         printf("        dynamic (depending on the options)\n");

     else if (!count)
         printf("        none (source filter)\n");

 
     printf("    Outputs:\n");
     count = avfilter_pad_count(f->outputs);
     for (i = 0; i < count; i++) {

         printf("       #%d: %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),

                media_type_string(avfilter_pad_get_type(f->outputs, i)));
     }
     if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
         printf("        dynamic (depending on the options)\n");

     else if (!count)
         printf("        none (sink filter)\n");

 
     if (f->priv_class)

         show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM |

                                           AV_OPT_FLAG_AUDIO_PARAM);

     if (f->flags & AVFILTER_FLAG_SUPPORT_TIMELINE)
         printf("This filter has support for timeline through the 'enable' option.\n");

 #else
     av_log(NULL, AV_LOG_ERROR, "Build without libavfilter; "
            "can not to satisfy request\n");
 #endif

 }

 #endif

 int show_help(void *optctx, const char *opt, const char *arg)

 {
     char *topic, *par;
     av_log_set_callback(log_callback_help);
 
     topic = av_strdup(arg ? arg : "");
     par = strchr(topic, '=');
     if (par)
         *par++ = 0;
 
     if (!*topic) {
         show_help_default(topic, par);
     } else if (!strcmp(topic, "decoder")) {
         show_help_codec(par, 0);
     } else if (!strcmp(topic, "encoder")) {
         show_help_codec(par, 1);

     } else if (!strcmp(topic, "demuxer")) {
         show_help_demuxer(par);
     } else if (!strcmp(topic, "muxer")) {
         show_help_muxer(par);

 #if CONFIG_AVFILTER

     } else if (!strcmp(topic, "filter")) {
         show_help_filter(par);

 #endif

     } else {
         show_help_default(topic, par);
     }
 
     av_freep(&topic);
     return 0;
 }
 

 int read_yesno(void)
 {
     int c = getchar();

     int yesno = (av_toupper(c) == 'Y');

 
     while (c != '\n' && c != EOF)
         c = getchar();
 
     return yesno;
 }

 int cmdutils_read_file(const char *filename, char **bufptr, size_t *size)

 {

     int64_t ret;

     FILE *f = av_fopen_utf8(filename, "rb");

 
     if (!f) {

         av_log(NULL, AV_LOG_ERROR, "Cannot read file '%s': %s\n", filename,
                strerror(errno));

         return AVERROR(errno);
     }

 
     ret = fseek(f, 0, SEEK_END);
     if (ret == -1) {
         ret = AVERROR(errno);
         goto out;
     }
 
     ret = ftell(f);
     if (ret < 0) {
         ret = AVERROR(errno);
         goto out;

     }

     *size = ret;
 
     ret = fseek(f, 0, SEEK_SET);
     if (ret == -1) {
         ret = AVERROR(errno);
         goto out;
     }
 

     *bufptr = av_malloc(*size + 1);
     if (!*bufptr) {

         av_log(NULL, AV_LOG_ERROR, "Could not allocate file buffer\n");

         ret = AVERROR(ENOMEM);
         goto out;

     }

     ret = fread(*bufptr, 1, *size, f);
     if (ret < *size) {
         av_free(*bufptr);
         if (ferror(f)) {
             av_log(NULL, AV_LOG_ERROR, "Error while reading file '%s': %s\n",
                    filename, strerror(errno));
             ret = AVERROR(errno);
         } else
             ret = AVERROR_EOF;
     } else {
         ret = 0;

         (*bufptr)[(*size)++] = '\0';

     }

 out:

     av_log(NULL, AV_LOG_ERROR, "IO error: %s\n", av_err2str(ret));

     fclose(f);

     return ret;

 }

 FILE *get_preset_file(char *filename, size_t filename_size,

                       const char *preset_name, int is_path,
                       const char *codec_name)

 {
     FILE *f = NULL;
     int i;

     const char *base[3] = { getenv("FFMPEG_DATADIR"),

                             getenv("HOME"),

                             FFMPEG_DATADIR, };

 
     if (is_path) {
         av_strlcpy(filename, preset_name, filename_size);
         f = fopen(filename, "r");
     } else {

 #ifdef _WIN32
         char datadir[MAX_PATH], *ls;
         base[2] = NULL;
 
         if (GetModuleFileNameA(GetModuleHandleA(NULL), datadir, sizeof(datadir) - 1))
         {
             for (ls = datadir; ls < datadir + strlen(datadir); ls++)
                 if (*ls == '\\') *ls = '/';
 
             if (ls = strrchr(datadir, '/'))
             {
                 *ls = 0;
                 strncat(datadir, "/ffpresets",  sizeof(datadir) - 1 - strlen(datadir));
                 base[2] = datadir;
             }
         }
 #endif

         for (i = 0; i < 3 && !f; i++) {
             if (!base[i])
                 continue;

             snprintf(filename, filename_size, "%s%s/%s.ffpreset", base[i],

                      i != 1 ? "" : "/.ffmpeg", preset_name);

             f = fopen(filename, "r");
             if (!f && codec_name) {
                 snprintf(filename, filename_size,

                          "%s%s/%s-%s.ffpreset",

                          base[i], i != 1 ? "" : "/.ffmpeg", codec_name,

                          preset_name);

                 f = fopen(filename, "r");
             }
         }
     }
 
     return f;
 }
 

 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
 {

     int ret = avformat_match_stream_specifier(s, st, spec);
     if (ret < 0)
         av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
     return ret;

 }
 

 AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,

                                 AVFormatContext *s, AVStream *st, AVCodec *codec)

 {
     AVDictionary    *ret = NULL;
     AVDictionaryEntry *t = NULL;

     int            flags = s->oformat ? AV_OPT_FLAG_ENCODING_PARAM
                                       : AV_OPT_FLAG_DECODING_PARAM;

     char          prefix = 0;

     const AVClass    *cc = avcodec_get_class();

 
     if (!codec)

         codec            = s->oformat ? avcodec_find_encoder(codec_id)
                                       : avcodec_find_decoder(codec_id);

     switch (st->codec->codec_type) {

     case AVMEDIA_TYPE_VIDEO:
         prefix  = 'v';
         flags  |= AV_OPT_FLAG_VIDEO_PARAM;
         break;
     case AVMEDIA_TYPE_AUDIO:
         prefix  = 'a';
         flags  |= AV_OPT_FLAG_AUDIO_PARAM;
         break;
     case AVMEDIA_TYPE_SUBTITLE:
         prefix  = 's';
         flags  |= AV_OPT_FLAG_SUBTITLE_PARAM;
         break;

     }
 
     while (t = av_dict_get(opts, "", t, AV_DICT_IGNORE_SUFFIX)) {

         char *p = strchr(t->key, ':');
 
         /* check stream specification in opt name */
         if (p)
             switch (check_stream_specifier(s, st, p + 1)) {
             case  1: *p = 0; break;
             case  0:         continue;
             default:         return NULL;
             }
 

         if (av_opt_find(&cc, t->key, NULL, flags, AV_OPT_SEARCH_FAKE_OBJ) ||

             !codec ||
             (codec->priv_class &&

              av_opt_find(&codec->priv_class, t->key, NULL, flags,
                          AV_OPT_SEARCH_FAKE_OBJ)))

             av_dict_set(&ret, t->key, t->value, 0);

         else if (t->key[0] == prefix &&
                  av_opt_find(&cc, t->key + 1, NULL, flags,
                              AV_OPT_SEARCH_FAKE_OBJ))
             av_dict_set(&ret, t->key + 1, t->value, 0);

 
         if (p)
             *p = ':';

     }
     return ret;
 }
 

 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
                                            AVDictionary *codec_opts)

 {
     int i;
     AVDictionary **opts;
 
     if (!s->nb_streams)
         return NULL;

     opts = av_mallocz_array(s->nb_streams, sizeof(*opts));

     if (!opts) {

         av_log(NULL, AV_LOG_ERROR,
                "Could not alloc memory for stream options.\n");

         return NULL;
     }
     for (i = 0; i < s->nb_streams; i++)

         opts[i] = filter_codec_opts(codec_opts, s->streams[i]->codec->codec_id,

                                     s, s->streams[i], NULL);

     return opts;
 }
 

 void *grow_array(void *array, int elem_size, int *size, int new_size)
 {
     if (new_size >= INT_MAX / elem_size) {
         av_log(NULL, AV_LOG_ERROR, "Array too big.\n");

         exit_program(1);

     }
     if (*size < new_size) {
         uint8_t *tmp = av_realloc(array, new_size*elem_size);
         if (!tmp) {
             av_log(NULL, AV_LOG_ERROR, "Could not alloc buffer.\n");

             exit_program(1);

         }
         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
         *size = new_size;
         return tmp;
     }
     return array;
 }