release/src/router/ffmpeg/cmdutils.c

   1 /*
   2  * Various utilities for command line tools
   3  * Copyright (c) 2000-2003 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25 #include <math.h>
  26
  27 /* Include only the enabled headers since some compilers (namely, Sun
  28    Studio) will not omit unused inline functions and create undefined
  29    references to libraries that are not being built. */
  30
  31 #include "config.h"
  32 #include "libavformat/avformat.h"
  33 #include "libavfilter/avfilter.h"
  34 #include "libavdevice/avdevice.h"
  35 #include "libswscale/swscale.h"
  36 #include "libpostproc/postprocess.h"
  37 #include "libavutil/avstring.h"
  38 #include "libavutil/pixdesc.h"
  39 #include "libavcodec/opt.h"
  40 #include "cmdutils.h"
  41 #include "version.h"
  42 #if CONFIG_NETWORK
  43 #include "libavformat/network.h"
  44 #endif
  45 #if HAVE_SYS_RESOURCE_H
  46 #include <sys/resource.h>
  47 #endif
  48
  49 const char **opt_names;
  50 static int opt_name_count;
  51 AVCodecContext *avcodec_opts[AVMEDIA_TYPE_NB];
  52 AVFormatContext *avformat_opts;
  53 struct SwsContext *sws_opts;
  54
  55 const int this_year = 2010;
  56
  57 double parse_number_or_die(const char *context, const char *numstr, int type, double min, double max)
  58 {
  59     char *tail;
  60     const char *error;
  61     double d = strtod(numstr, &tail);
  62     if (*tail)
  63         error= "Expected number for %s but found: %s\n";
  64     else if (d < min || d > max)
  65         error= "The value for %s was %s which is not within %f - %f\n";
  66     else if(type == OPT_INT64 && (int64_t)d != d)
  67         error= "Expected int64 for %s but found %s\n";
  68     else
  69         return d;
  70     fprintf(stderr, error, context, numstr, min, max);
  71     exit(1);
  72 }
  73
  74 int64_t parse_time_or_die(const char *context, const char *timestr, int is_duration)
  75 {
  76     int64_t us = parse_date(timestr, is_duration);
  77     if (us == INT64_MIN) {
  78         fprintf(stderr, "Invalid %s specification for %s: %s\n",
  79                 is_duration ? "duration" : "date", context, timestr);
  80         exit(1);
  81     }
  82     return us;
  83 }
  84
  85 void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
  86 {
  87     const OptionDef *po;
  88     int first;
  89
  90     first = 1;
  91     for(po = options; po->name != NULL; po++) {
  92         char buf[64];
  93         if ((po->flags & mask) == value) {
  94             if (first) {
  95                 printf("%s", msg);
  96                 first = 0;
  97             }
  98             av_strlcpy(buf, po->name, sizeof(buf));
  99             if (po->flags & HAS_ARG) {
 100                 av_strlcat(buf, " ", sizeof(buf));
 101                 av_strlcat(buf, po->argname, sizeof(buf));
 102             }
 103             printf("-%-17s  %s\n", buf, po->help);
 104         }
 105     }
 106 }
 107
 108 static const OptionDef* find_option(const OptionDef *po, const char *name){
 109     while (po->name != NULL) {
 110         if (!strcmp(name, po->name))
 111             break;
 112         po++;
 113     }
 114     return po;
 115 }
 116
 117 void parse_options(int argc, char **argv, const OptionDef *options,
 118                    void (* parse_arg_function)(const char*))
 119 {
 120     const char *opt, *arg;
 121     int optindex, handleoptions=1;
 122     const OptionDef *po;
 123
 124     /* parse options */
 125     optindex = 1;
 126     while (optindex < argc) {
 127         opt = argv[optindex++];
 128
 129         if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
 130             int bool_val = 1;
 131             if (opt[1] == '-' && opt[2] == '\0') {
 132                 handleoptions = 0;
 133                 continue;
 134             }
 135             opt++;
 136             po= find_option(options, opt);
 137             if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
 138                 /* handle 'no' bool option */
 139                 po = find_option(options, opt + 2);
 140                 if (!(po->name && (po->flags & OPT_BOOL)))
 141                     goto unknown_opt;
 142                 bool_val = 0;
 143             }
 144             if (!po->name)
 145                 po= find_option(options, "default");
 146             if (!po->name) {
 147 unknown_opt:
 148                 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
 149                 exit(1);
 150             }
 151             arg = NULL;
 152             if (po->flags & HAS_ARG) {
 153                 arg = argv[optindex++];
 154                 if (!arg) {
 155                     fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
 156                     exit(1);
 157                 }
 158             }
 159             if (po->flags & OPT_STRING) {
 160                 char *str;
 161                 str = av_strdup(arg);
 162                 *po->u.str_arg = str;
 163             } else if (po->flags & OPT_BOOL) {
 164                 *po->u.int_arg = bool_val;
 165             } else if (po->flags & OPT_INT) {
 166                 *po->u.int_arg = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
 167             } else if (po->flags & OPT_INT64) {
 168                 *po->u.int64_arg = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
 169             } else if (po->flags & OPT_FLOAT) {
 170                 *po->u.float_arg = parse_number_or_die(opt, arg, OPT_FLOAT, -1.0/0.0, 1.0/0.0);
 171             } else if (po->flags & OPT_FUNC2) {
 172                 if (po->u.func2_arg(opt, arg) < 0) {
 173                     fprintf(stderr, "%s: failed to set value '%s' for option '%s'\n", argv[0], arg, opt);
 174                     exit(1);
 175                 }
 176             } else {
 177                 po->u.func_arg(arg);
 178             }
 179             if(po->flags & OPT_EXIT)
 180                 exit(0);
 181         } else {
 182             if (parse_arg_function)
 183                 parse_arg_function(opt);
 184         }
 185     }
 186 }
 187
 188 int opt_default(const char *opt, const char *arg){
 189     int type;
 190     int ret= 0;
 191     const AVOption *o= NULL;
 192     int opt_types[]={AV_OPT_FLAG_VIDEO_PARAM, AV_OPT_FLAG_AUDIO_PARAM, 0, AV_OPT_FLAG_SUBTITLE_PARAM, 0};
 193
 194     for(type=0; type<AVMEDIA_TYPE_NB && ret>= 0; type++){
 195         const AVOption *o2 = av_find_opt(avcodec_opts[0], opt, NULL, opt_types[type], opt_types[type]);
 196         if(o2)
 197             ret = av_set_string3(avcodec_opts[type], opt, arg, 1, &o);
 198     }
 199     if(!o)
 200         ret = av_set_string3(avformat_opts, opt, arg, 1, &o);
 201     if(!o && sws_opts)
 202         ret = av_set_string3(sws_opts, opt, arg, 1, &o);
 203     if(!o){
 204         if(opt[0] == 'a')
 205             ret = av_set_string3(avcodec_opts[AVMEDIA_TYPE_AUDIO], opt+1, arg, 1, &o);
 206         else if(opt[0] == 'v')
 207             ret = av_set_string3(avcodec_opts[AVMEDIA_TYPE_VIDEO], opt+1, arg, 1, &o);
 208         else if(opt[0] == 's')
 209             ret = av_set_string3(avcodec_opts[AVMEDIA_TYPE_SUBTITLE], opt+1, arg, 1, &o);
 210     }
 211     if (o && ret < 0) {
 212         fprintf(stderr, "Invalid value '%s' for option '%s'\n", arg, opt);
 213         exit(1);
 214     }
 215     if (!o) {
 216         fprintf(stderr, "Unrecognized option '%s'\n", opt);
 217         exit(1);
 218     }
 219
 220 //    av_log(NULL, AV_LOG_ERROR, "%s:%s: %f 0x%0X\n", opt, arg, av_get_double(avcodec_opts, opt, NULL), (int)av_get_int(avcodec_opts, opt, NULL));
 221
 222     //FIXME we should always use avcodec_opts, ... for storing options so there will not be any need to keep track of what i set over this
 223     opt_names= av_realloc(opt_names, sizeof(void*)*(opt_name_count+1));
 224     opt_names[opt_name_count++]= o->name;
 225
 226     if(avcodec_opts[0]->debug || avformat_opts->debug)
 227         av_log_set_level(AV_LOG_DEBUG);
 228     return 0;
 229 }
 230
 231 int opt_loglevel(const char *opt, const char *arg)
 232 {
 233     const struct { const char *name; int level; } log_levels[] = {
 234         { "quiet"  , AV_LOG_QUIET   },
 235         { "panic"  , AV_LOG_PANIC   },
 236         { "fatal"  , AV_LOG_FATAL   },
 237         { "error"  , AV_LOG_ERROR   },
 238         { "warning", AV_LOG_WARNING },
 239         { "info"   , AV_LOG_INFO    },
 240         { "verbose", AV_LOG_VERBOSE },
 241         { "debug"  , AV_LOG_DEBUG   },
 242     };
 243     char *tail;
 244     int level;
 245     int i;
 246
 247     for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
 248         if (!strcmp(log_levels[i].name, arg)) {
 249             av_log_set_level(log_levels[i].level);
 250             return 0;
 251         }
 252     }
 253
 254     level = strtol(arg, &tail, 10);
 255     if (*tail) {
 256         fprintf(stderr, "Invalid loglevel \"%s\". "
 257                         "Possible levels are numbers or:\n", arg);
 258         for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
 259             fprintf(stderr, "\"%s\"\n", log_levels[i].name);
 260         exit(1);
 261     }
 262     av_log_set_level(level);
 263     return 0;
 264 }
 265
 266 int opt_timelimit(const char *opt, const char *arg)
 267 {
 268 #if HAVE_SETRLIMIT
 269     int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
 270     struct rlimit rl = { lim, lim + 1 };
 271     if (setrlimit(RLIMIT_CPU, &rl))
 272         perror("setrlimit");
 273 #else
 274     fprintf(stderr, "Warning: -%s not implemented on this OS\n", opt);
 275 #endif
 276     return 0;
 277 }
 278
 279 void set_context_opts(void *ctx, void *opts_ctx, int flags)
 280 {
 281     int i;
 282     for(i=0; i<opt_name_count; i++){
 283         char buf[256];
 284         const AVOption *opt;
 285         const char *str= av_get_string(opts_ctx, opt_names[i], &opt, buf, sizeof(buf));
 286         /* if an option with name opt_names[i] is present in opts_ctx then str is non-NULL */
 287         if(str && ((opt->flags & flags) == flags))
 288             av_set_string3(ctx, opt_names[i], str, 1, NULL);
 289     }
 290 }
 291
 292 void print_error(const char *filename, int err)
 293 {
 294     char errbuf[128];
 295     const char *errbuf_ptr = errbuf;
 296
 297     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
 298         errbuf_ptr = strerror(AVUNERROR(err));
 299     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
 300 }
 301
 302 #define PRINT_LIB_VERSION(outstream,libname,LIBNAME,indent)             \
 303     if (CONFIG_##LIBNAME) {                                             \
 304         unsigned int version = libname##_version();                     \
 305         fprintf(outstream, "%slib%-10s %2d.%2d.%2d / %2d.%2d.%2d\n",    \
 306                 indent? "  " : "", #libname,                            \
 307                 LIB##LIBNAME##_VERSION_MAJOR,                           \
 308                 LIB##LIBNAME##_VERSION_MINOR,                           \
 309                 LIB##LIBNAME##_VERSION_MICRO,                           \
 310                 version >> 16, version >> 8 & 0xff, version & 0xff);    \
 311     }
 312
 313 static void print_all_lib_versions(FILE* outstream, int indent)
 314 {
 315     PRINT_LIB_VERSION(outstream, avutil,   AVUTIL,   indent);
 316     PRINT_LIB_VERSION(outstream, avcodec,  AVCODEC,  indent);
 317     PRINT_LIB_VERSION(outstream, avformat, AVFORMAT, indent);
 318     PRINT_LIB_VERSION(outstream, avdevice, AVDEVICE, indent);
 319     PRINT_LIB_VERSION(outstream, avfilter, AVFILTER, indent);
 320     PRINT_LIB_VERSION(outstream, swscale,  SWSCALE,  indent);
 321     PRINT_LIB_VERSION(outstream, postproc, POSTPROC, indent);
 322 }
 323
 324 static void maybe_print_config(const char *lib, const char *cfg)
 325 {
 326     static int warned_cfg;
 327
 328     if (strcmp(FFMPEG_CONFIGURATION, cfg)) {
 329         if (!warned_cfg) {
 330             fprintf(stderr, "  WARNING: library configuration mismatch\n");
 331             warned_cfg = 1;
 332         }
 333         fprintf(stderr, "  %-11s configuration: %s\n", lib, cfg);
 334     }
 335 }
 336
 337 #define PRINT_LIB_CONFIG(lib, tag, cfg) do {    \
 338         if (CONFIG_##lib)                       \
 339             maybe_print_config(tag, cfg);       \
 340     } while (0)
 341
 342 void show_banner(void)
 343 {
 344     fprintf(stderr, "%s version " FFMPEG_VERSION ", Copyright (c) %d-%d the FFmpeg developers\n",
 345             program_name, program_birth_year, this_year);
 346     fprintf(stderr, "  built on %s %s with %s %s\n",
 347             __DATE__, __TIME__, CC_TYPE, CC_VERSION);
 348     fprintf(stderr, "  configuration: " FFMPEG_CONFIGURATION "\n");
 349     PRINT_LIB_CONFIG(AVUTIL,   "libavutil",   avutil_configuration());
 350     PRINT_LIB_CONFIG(AVCODEC,  "libavcodec",  avcodec_configuration());
 351     PRINT_LIB_CONFIG(AVFORMAT, "libavformat", avformat_configuration());
 352     PRINT_LIB_CONFIG(AVDEVICE, "libavdevice", avdevice_configuration());
 353     PRINT_LIB_CONFIG(AVFILTER, "libavfilter", avfilter_configuration());
 354     PRINT_LIB_CONFIG(SWSCALE,  "libswscale",  swscale_configuration());
 355     PRINT_LIB_CONFIG(POSTPROC, "libpostproc", postproc_configuration());
 356     print_all_lib_versions(stderr, 1);
 357 }
 358
 359 void show_version(void) {
 360     printf("%s " FFMPEG_VERSION "\n", program_name);
 361     print_all_lib_versions(stdout, 0);
 362 }
 363
 364 void show_license(void)
 365 {
 366     printf(
 367 #if CONFIG_NONFREE
 368     "This version of %s has nonfree parts compiled in.\n"
 369     "Therefore it is not legally redistributable.\n",
 370     program_name
 371 #elif CONFIG_GPLV3
 372     "%s is free software; you can redistribute it and/or modify\n"
 373     "it under the terms of the GNU General Public License as published by\n"
 374     "the Free Software Foundation; either version 3 of the License, or\n"
 375     "(at your option) any later version.\n"
 376     "\n"
 377     "%s is distributed in the hope that it will be useful,\n"
 378     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
 379     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
 380     "GNU General Public License for more details.\n"
 381     "\n"
 382     "You should have received a copy of the GNU General Public License\n"
 383     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
 384     program_name, program_name, program_name
 385 #elif CONFIG_GPL
 386     "%s is free software; you can redistribute it and/or modify\n"
 387     "it under the terms of the GNU General Public License as published by\n"
 388     "the Free Software Foundation; either version 2 of the License, or\n"
 389     "(at your option) any later version.\n"
 390     "\n"
 391     "%s is distributed in the hope that it will be useful,\n"
 392     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
 393     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
 394     "GNU General Public License for more details.\n"
 395     "\n"
 396     "You should have received a copy of the GNU General Public License\n"
 397     "along with %s; if not, write to the Free Software\n"
 398     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
 399     program_name, program_name, program_name
 400 #elif CONFIG_LGPLV3
 401     "%s is free software; you can redistribute it and/or modify\n"
 402     "it under the terms of the GNU Lesser General Public License as published by\n"
 403     "the Free Software Foundation; either version 3 of the License, or\n"
 404     "(at your option) any later version.\n"
 405     "\n"
 406     "%s is distributed in the hope that it will be useful,\n"
 407     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
 408     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
 409     "GNU Lesser General Public License for more details.\n"
 410     "\n"
 411     "You should have received a copy of the GNU Lesser General Public License\n"
 412     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
 413     program_name, program_name, program_name
 414 #else
 415     "%s is free software; you can redistribute it and/or\n"
 416     "modify it under the terms of the GNU Lesser General Public\n"
 417     "License as published by the Free Software Foundation; either\n"
 418     "version 2.1 of the License, or (at your option) any later version.\n"
 419     "\n"
 420     "%s is distributed in the hope that it will be useful,\n"
 421     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
 422     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
 423     "Lesser General Public License for more details.\n"
 424     "\n"
 425     "You should have received a copy of the GNU Lesser General Public\n"
 426     "License along with %s; if not, write to the Free Software\n"
 427     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
 428     program_name, program_name, program_name
 429 #endif
 430     );
 431 }
 432
 433 void list_fmts(void (*get_fmt_string)(char *buf, int buf_size, int fmt), int nb_fmts)
 434 {
 435     int i;
 436     char fmt_str[128];
 437     for (i=-1; i < nb_fmts; i++) {
 438         get_fmt_string (fmt_str, sizeof(fmt_str), i);
 439         fprintf(stdout, "%s\n", fmt_str);
 440     }
 441 }
 442
 443 void show_formats(void)
 444 {
 445     AVInputFormat *ifmt=NULL;
 446     AVOutputFormat *ofmt=NULL;
 447     const char *last_name;
 448
 449     printf(
 450         "File formats:\n"
 451         " D. = Demuxing supported\n"
 452         " .E = Muxing supported\n"
 453         " --\n");
 454     last_name= "000";
 455     for(;;){
 456         int decode=0;
 457         int encode=0;
 458         const char *name=NULL;
 459         const char *long_name=NULL;
 460
 461         while((ofmt= av_oformat_next(ofmt))) {
 462             if((name == NULL || strcmp(ofmt->name, name)<0) &&
 463                 strcmp(ofmt->name, last_name)>0){
 464                 name= ofmt->name;
 465                 long_name= ofmt->long_name;
 466                 encode=1;
 467             }
 468         }
 469         while((ifmt= av_iformat_next(ifmt))) {
 470             if((name == NULL || strcmp(ifmt->name, name)<0) &&
 471                 strcmp(ifmt->name, last_name)>0){
 472                 name= ifmt->name;
 473                 long_name= ifmt->long_name;
 474                 encode=0;
 475             }
 476             if(name && strcmp(ifmt->name, name)==0)
 477                 decode=1;
 478         }
 479         if(name==NULL)
 480             break;
 481         last_name= name;
 482
 483         printf(
 484             " %s%s %-15s %s\n",
 485             decode ? "D":" ",
 486             encode ? "E":" ",
 487             name,
 488             long_name ? long_name:" ");
 489     }
 490 }
 491
 492 void show_codecs(void)
 493 {
 494     AVCodec *p=NULL, *p2;
 495     const char *last_name;
 496     printf(
 497         "Codecs:\n"
 498         " D..... = Decoding supported\n"
 499         " .E.... = Encoding supported\n"
 500         " ..V... = Video codec\n"
 501         " ..A... = Audio codec\n"
 502         " ..S... = Subtitle codec\n"
 503         " ...S.. = Supports draw_horiz_band\n"
 504         " ....D. = Supports direct rendering method 1\n"
 505         " .....T = Supports weird frame truncation\n"
 506         " ------\n");
 507     last_name= "000";
 508     for(;;){
 509         int decode=0;
 510         int encode=0;
 511         int cap=0;
 512         const char *type_str;
 513
 514         p2=NULL;
 515         while((p= av_codec_next(p))) {
 516             if((p2==NULL || strcmp(p->name, p2->name)<0) &&
 517                 strcmp(p->name, last_name)>0){
 518                 p2= p;
 519                 decode= encode= cap=0;
 520             }
 521             if(p2 && strcmp(p->name, p2->name)==0){
 522                 if(p->decode) decode=1;
 523                 if(p->encode) encode=1;
 524                 cap |= p->capabilities;
 525             }
 526         }
 527         if(p2==NULL)
 528             break;
 529         last_name= p2->name;
 530
 531         switch(p2->type) {
 532         case AVMEDIA_TYPE_VIDEO:
 533             type_str = "V";
 534             break;
 535         case AVMEDIA_TYPE_AUDIO:
 536             type_str = "A";
 537             break;
 538         case AVMEDIA_TYPE_SUBTITLE:
 539             type_str = "S";
 540             break;
 541         default:
 542             type_str = "?";
 543             break;
 544         }
 545         printf(
 546             " %s%s%s%s%s%s %-15s %s",
 547             decode ? "D": (/*p2->decoder ? "d":*/" "),
 548             encode ? "E":" ",
 549             type_str,
 550             cap & CODEC_CAP_DRAW_HORIZ_BAND ? "S":" ",
 551             cap & CODEC_CAP_DR1 ? "D":" ",
 552             cap & CODEC_CAP_TRUNCATED ? "T":" ",
 553             p2->name,
 554             p2->long_name ? p2->long_name : "");
 555        /* if(p2->decoder && decode==0)
 556             printf(" use %s for decoding", p2->decoder->name);*/
 557         printf("\n");
 558     }
 559     printf("\n");
 560     printf(
 561 "Note, the names of encoders and decoders do not always match, so there are\n"
 562 "several cases where the above table shows encoder only or decoder only entries\n"
 563 "even though both encoding and decoding are supported. For example, the h263\n"
 564 "decoder corresponds to the h263 and h263p encoders, for file formats it is even\n"
 565 "worse.\n");
 566 }
 567
 568 void show_bsfs(void)
 569 {
 570     AVBitStreamFilter *bsf=NULL;
 571
 572     printf("Bitstream filters:\n");
 573     while((bsf = av_bitstream_filter_next(bsf)))
 574         printf("%s\n", bsf->name);
 575     printf("\n");
 576 }
 577
 578 void show_protocols(void)
 579 {
 580     URLProtocol *up=NULL;
 581
 582     printf("Supported file protocols:\n");
 583     while((up = av_protocol_next(up)))
 584         printf("%s\n", up->name);
 585 }
 586
 587 void show_filters(void)
 588 {
 589     AVFilter av_unused(**filter) = NULL;
 590
 591     printf("Filters:\n");
 592 #if CONFIG_AVFILTER
 593     while ((filter = av_filter_next(filter)) && *filter)
 594         printf("%-16s %s\n", (*filter)->name, (*filter)->description);
 595 #endif
 596 }
 597
 598 void show_pix_fmts(void)
 599 {
 600     enum PixelFormat pix_fmt;
 601
 602     printf(
 603         "Pixel formats:\n"
 604         "I.... = Supported Input  format for conversion\n"
 605         ".O... = Supported Output format for conversion\n"
 606         "..H.. = Hardware accelerated format\n"
 607         "...P. = Paletted format\n"
 608         "....B = Bitstream format\n"
 609         "FLAGS NAME            NB_COMPONENTS BITS_PER_PIXEL\n"
 610         "-----\n");
 611
 612 #if !CONFIG_SWSCALE
 613 #   define sws_isSupportedInput(x)  0
 614 #   define sws_isSupportedOutput(x) 0
 615 #endif
 616
 617     for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++) {
 618         const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[pix_fmt];
 619         printf("%c%c%c%c%c %-16s       %d            %2d\n",
 620                sws_isSupportedInput (pix_fmt)      ? 'I' : '.',
 621                sws_isSupportedOutput(pix_fmt)      ? 'O' : '.',
 622                pix_desc->flags & PIX_FMT_HWACCEL   ? 'H' : '.',
 623                pix_desc->flags & PIX_FMT_PAL       ? 'P' : '.',
 624                pix_desc->flags & PIX_FMT_BITSTREAM ? 'B' : '.',
 625                pix_desc->name,
 626                pix_desc->nb_components,
 627                av_get_bits_per_pixel(pix_desc));
 628     }
 629 }
 630
 631 int read_yesno(void)
 632 {
 633     int c = getchar();
 634     int yesno = (toupper(c) == 'Y');
 635
 636     while (c != '\n' && c != EOF)
 637         c = getchar();
 638
 639     return yesno;
 640 }
 641
 642 int read_file(const char *filename, char **bufptr, size_t *size)
 643 {
 644     FILE *f = fopen(filename, "rb");
 645
 646     if (!f) {
 647         fprintf(stderr, "Cannot read file '%s': %s\n", filename, strerror(errno));
 648         return AVERROR(errno);
 649     }
 650     fseek(f, 0, SEEK_END);
 651     *size = ftell(f);
 652     fseek(f, 0, SEEK_SET);
 653     *bufptr = av_malloc(*size + 1);
 654     if (!*bufptr) {
 655         fprintf(stderr, "Could not allocate file buffer\n");
 656         fclose(f);
 657         return AVERROR(ENOMEM);
 658     }
 659     fread(*bufptr, 1, *size, f);
 660     (*bufptr)[*size++] = '\0';
 661
 662     fclose(f);
 663     return 0;
 664 }