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 <stdint.h>
24 #include <stdlib.h>
25 #include <errno.h>
26 #include <math.h>
27 
28 /* Include only the enabled headers since some compilers (namely, Sun
29    Studio) will not omit unused inline functions and create undefined
30    references to libraries that are not being built. */
31 
32 #include "config.h"
33 #include "compat/va_copy.h"
34 #include "libavformat/avformat.h"
35 #include "libavfilter/avfilter.h"
36 #include "libavdevice/avdevice.h"
37 #include "libavresample/avresample.h"
38 #include "libswscale/swscale.h"
39 #include "libswresample/swresample.h"
40 #include "libpostproc/postprocess.h"
41 #include "libavutil/attributes.h"
42 #include "libavutil/avassert.h"
43 #include "libavutil/avstring.h"
44 #include "libavutil/bprint.h"
45 #include "libavutil/display.h"
46 #include "libavutil/mathematics.h"
47 #include "libavutil/imgutils.h"
48 #include "libavutil/libm.h"
49 #include "libavutil/parseutils.h"
50 #include "libavutil/pixdesc.h"
51 #include "libavutil/eval.h"
52 #include "libavutil/dict.h"
53 #include "libavutil/opt.h"
54 #include "libavutil/cpu.h"
55 #include "libavutil/ffversion.h"
56 #include "libavutil/version.h"
57 #include "cmdutils.h"
58 #if HAVE_SYS_RESOURCE_H
59 #include <sys/time.h>
60 #include <sys/resource.h>
61 #endif
62 #ifdef _WIN32
63 #include <windows.h>
64 #endif
65 
66 static int init_report(const char *env);
67 
68 AVDictionary *sws_dict;
69 AVDictionary *swr_opts;
70 AVDictionary *format_opts, *codec_opts, *resample_opts;
71 
72 static FILE *report_file;
73 static int report_file_level = AV_LOG_DEBUG;
74 int hide_banner = 0;
75 
76 enum show_muxdemuxers {
77     SHOW_DEFAULT,
78     SHOW_DEMUXERS,
79     SHOW_MUXERS,
80 };
81 
init_opts(void)82 void init_opts(void)
83 {
84     av_dict_set(&sws_dict, "flags", "bicubic", 0);
85 }
86 
uninit_opts(void)87 void uninit_opts(void)
88 {
89     av_dict_free(&swr_opts);
90     av_dict_free(&sws_dict);
91     av_dict_free(&format_opts);
92     av_dict_free(&codec_opts);
93     av_dict_free(&resample_opts);
94 }
95 
log_callback_help(void * ptr,int level,const char * fmt,va_list vl)96 void log_callback_help(void *ptr, int level, const char *fmt, va_list vl)
97 {
98     vfprintf(stdout, fmt, vl);
99 }
100 
log_callback_report(void * ptr,int level,const char * fmt,va_list vl)101 static void log_callback_report(void *ptr, int level, const char *fmt, va_list vl)
102 {
103     va_list vl2;
104     char line[1024];
105     static int print_prefix = 1;
106 
107     va_copy(vl2, vl);
108     av_log_default_callback(ptr, level, fmt, vl);
109     av_log_format_line(ptr, level, fmt, vl2, line, sizeof(line), &print_prefix);
110     va_end(vl2);
111     if (report_file_level >= level) {
112         fputs(line, report_file);
113         fflush(report_file);
114     }
115 }
116 
init_dynload(void)117 void init_dynload(void)
118 {
119 #if HAVE_SETDLLDIRECTORY && defined(_WIN32)
120     /* Calling SetDllDirectory with the empty string (but not NULL) removes the
121      * current working directory from the DLL search path as a security pre-caution. */
122     SetDllDirectory("");
123 #endif
124 }
125 
126 static void (*program_exit)(int ret);
127 
register_exit(void (* cb)(int ret))128 void register_exit(void (*cb)(int ret))
129 {
130     program_exit = cb;
131 }
132 
exit_program(int ret)133 void exit_program(int ret)
134 {
135     if (program_exit)
136         program_exit(ret);
137 
138     exit(ret);
139 }
140 
parse_number_or_die(const char * context,const char * numstr,int type,double min,double max)141 double parse_number_or_die(const char *context, const char *numstr, int type,
142                            double min, double max)
143 {
144     char *tail;
145     const char *error;
146     double d = av_strtod(numstr, &tail);
147     if (*tail)
148         error = "Expected number for %s but found: %s\n";
149     else if (d < min || d > max)
150         error = "The value for %s was %s which is not within %f - %f\n";
151     else if (type == OPT_INT64 && (int64_t)d != d)
152         error = "Expected int64 for %s but found %s\n";
153     else if (type == OPT_INT && (int)d != d)
154         error = "Expected int for %s but found %s\n";
155     else
156         return d;
157     av_log(NULL, AV_LOG_FATAL, error, context, numstr, min, max);
158     exit_program(1);
159     return 0;
160 }
161 
parse_time_or_die(const char * context,const char * timestr,int is_duration)162 int64_t parse_time_or_die(const char *context, const char *timestr,
163                           int is_duration)
164 {
165     int64_t us;
166     if (av_parse_time(&us, timestr, is_duration) < 0) {
167         av_log(NULL, AV_LOG_FATAL, "Invalid %s specification for %s: %s\n",
168                is_duration ? "duration" : "date", context, timestr);
169         exit_program(1);
170     }
171     return us;
172 }
173 
show_help_options(const OptionDef * options,const char * msg,int req_flags,int rej_flags,int alt_flags)174 void show_help_options(const OptionDef *options, const char *msg, int req_flags,
175                        int rej_flags, int alt_flags)
176 {
177     const OptionDef *po;
178     int first;
179 
180     first = 1;
181     for (po = options; po->name; po++) {
182         char buf[128];
183 
184         if (((po->flags & req_flags) != req_flags) ||
185             (alt_flags && !(po->flags & alt_flags)) ||
186             (po->flags & rej_flags))
187             continue;
188 
189         if (first) {
190             printf("%s\n", msg);
191             first = 0;
192         }
193         av_strlcpy(buf, po->name, sizeof(buf));
194         if (po->argname) {
195             av_strlcat(buf, " ", sizeof(buf));
196             av_strlcat(buf, po->argname, sizeof(buf));
197         }
198         printf("-%-17s  %s\n", buf, po->help);
199     }
200     printf("\n");
201 }
202 
show_help_children(const AVClass * class,int flags)203 void show_help_children(const AVClass *class, int flags)
204 {
205     void *iter = NULL;
206     const AVClass *child;
207     if (class->option) {
208         av_opt_show2(&class, NULL, flags, 0);
209         printf("\n");
210     }
211 
212     while (child = av_opt_child_class_iterate(class, &iter))
213         show_help_children(child, flags);
214 }
215 
find_option(const OptionDef * po,const char * name)216 static const OptionDef *find_option(const OptionDef *po, const char *name)
217 {
218     while (po->name) {
219         const char *end;
220         if (av_strstart(name, po->name, &end) && (!*end || *end == ':'))
221             break;
222         po++;
223     }
224     return po;
225 }
226 
227 /* _WIN32 means using the windows libc - cygwin doesn't define that
228  * by default. HAVE_COMMANDLINETOARGVW is true on cygwin, while
229  * it doesn't provide the actual command line via GetCommandLineW(). */
230 #if HAVE_COMMANDLINETOARGVW && defined(_WIN32)
231 #include <shellapi.h>
232 /* Will be leaked on exit */
233 static char** win32_argv_utf8 = NULL;
234 static int win32_argc = 0;
235 
236 /**
237  * Prepare command line arguments for executable.
238  * For Windows - perform wide-char to UTF-8 conversion.
239  * Input arguments should be main() function arguments.
240  * @param argc_ptr Arguments number (including executable)
241  * @param argv_ptr Arguments list.
242  */
prepare_app_arguments(int * argc_ptr,char *** argv_ptr)243 static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
244 {
245     char *argstr_flat;
246     wchar_t **argv_w;
247     int i, buffsize = 0, offset = 0;
248 
249     if (win32_argv_utf8) {
250         *argc_ptr = win32_argc;
251         *argv_ptr = win32_argv_utf8;
252         return;
253     }
254 
255     win32_argc = 0;
256     argv_w = CommandLineToArgvW(GetCommandLineW(), &win32_argc);
257     if (win32_argc <= 0 || !argv_w)
258         return;
259 
260     /* determine the UTF-8 buffer size (including NULL-termination symbols) */
261     for (i = 0; i < win32_argc; i++)
262         buffsize += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
263                                         NULL, 0, NULL, NULL);
264 
265     win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
266     argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
267     if (!win32_argv_utf8) {
268         LocalFree(argv_w);
269         return;
270     }
271 
272     for (i = 0; i < win32_argc; i++) {
273         win32_argv_utf8[i] = &argstr_flat[offset];
274         offset += WideCharToMultiByte(CP_UTF8, 0, argv_w[i], -1,
275                                       &argstr_flat[offset],
276                                       buffsize - offset, NULL, NULL);
277     }
278     win32_argv_utf8[i] = NULL;
279     LocalFree(argv_w);
280 
281     *argc_ptr = win32_argc;
282     *argv_ptr = win32_argv_utf8;
283 }
284 #else
prepare_app_arguments(int * argc_ptr,char *** argv_ptr)285 static inline void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
286 {
287     /* nothing to do */
288 }
289 #endif /* HAVE_COMMANDLINETOARGVW */
290 
write_option(void * optctx,const OptionDef * po,const char * opt,const char * arg)291 static int write_option(void *optctx, const OptionDef *po, const char *opt,
292                         const char *arg)
293 {
294     /* new-style options contain an offset into optctx, old-style address of
295      * a global var*/
296     void *dst = po->flags & (OPT_OFFSET | OPT_SPEC) ?
297                 (uint8_t *)optctx + po->u.off : po->u.dst_ptr;
298     int *dstcount;
299 
300     if (po->flags & OPT_SPEC) {
301         SpecifierOpt **so = dst;
302         char *p = strchr(opt, ':');
303         char *str;
304 
305         dstcount = (int *)(so + 1);
306         *so = grow_array(*so, sizeof(**so), dstcount, *dstcount + 1);
307         str = av_strdup(p ? p + 1 : "");
308         if (!str)
309             return AVERROR(ENOMEM);
310         (*so)[*dstcount - 1].specifier = str;
311         dst = &(*so)[*dstcount - 1].u;
312     }
313 
314     if (po->flags & OPT_STRING) {
315         char *str;
316         str = av_strdup(arg);
317         av_freep(dst);
318         if (!str)
319             return AVERROR(ENOMEM);
320         *(char **)dst = str;
321     } else if (po->flags & OPT_BOOL || po->flags & OPT_INT) {
322         *(int *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
323     } else if (po->flags & OPT_INT64) {
324         *(int64_t *)dst = parse_number_or_die(opt, arg, OPT_INT64, INT64_MIN, INT64_MAX);
325     } else if (po->flags & OPT_TIME) {
326         *(int64_t *)dst = parse_time_or_die(opt, arg, 1);
327     } else if (po->flags & OPT_FLOAT) {
328         *(float *)dst = parse_number_or_die(opt, arg, OPT_FLOAT, -INFINITY, INFINITY);
329     } else if (po->flags & OPT_DOUBLE) {
330         *(double *)dst = parse_number_or_die(opt, arg, OPT_DOUBLE, -INFINITY, INFINITY);
331     } else if (po->u.func_arg) {
332         int ret = po->u.func_arg(optctx, opt, arg);
333         if (ret < 0) {
334             av_log(NULL, AV_LOG_ERROR,
335                    "Failed to set value '%s' for option '%s': %s\n",
336                    arg, opt, av_err2str(ret));
337             return ret;
338         }
339     }
340     if (po->flags & OPT_EXIT)
341         exit_program(0);
342 
343     return 0;
344 }
345 
parse_option(void * optctx,const char * opt,const char * arg,const OptionDef * options)346 int parse_option(void *optctx, const char *opt, const char *arg,
347                  const OptionDef *options)
348 {
349     const OptionDef *po;
350     int ret;
351 
352     po = find_option(options, opt);
353     if (!po->name && opt[0] == 'n' && opt[1] == 'o') {
354         /* handle 'no' bool option */
355         po = find_option(options, opt + 2);
356         if ((po->name && (po->flags & OPT_BOOL)))
357             arg = "0";
358     } else if (po->flags & OPT_BOOL)
359         arg = "1";
360 
361     if (!po->name)
362         po = find_option(options, "default");
363     if (!po->name) {
364         av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'\n", opt);
365         return AVERROR(EINVAL);
366     }
367     if (po->flags & HAS_ARG && !arg) {
368         av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'\n", opt);
369         return AVERROR(EINVAL);
370     }
371 
372     ret = write_option(optctx, po, opt, arg);
373     if (ret < 0)
374         return ret;
375 
376     return !!(po->flags & HAS_ARG);
377 }
378 
parse_options(void * optctx,int argc,char ** argv,const OptionDef * options,void (* parse_arg_function)(void *,const char *))379 void parse_options(void *optctx, int argc, char **argv, const OptionDef *options,
380                    void (*parse_arg_function)(void *, const char*))
381 {
382     const char *opt;
383     int optindex, handleoptions = 1, ret;
384 
385     /* perform system-dependent conversions for arguments list */
386     prepare_app_arguments(&argc, &argv);
387 
388     /* parse options */
389     optindex = 1;
390     while (optindex < argc) {
391         opt = argv[optindex++];
392 
393         if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
394             if (opt[1] == '-' && opt[2] == '\0') {
395                 handleoptions = 0;
396                 continue;
397             }
398             opt++;
399 
400             if ((ret = parse_option(optctx, opt, argv[optindex], options)) < 0)
401                 exit_program(1);
402             optindex += ret;
403         } else {
404             if (parse_arg_function)
405                 parse_arg_function(optctx, opt);
406         }
407     }
408 }
409 
parse_optgroup(void * optctx,OptionGroup * g)410 int parse_optgroup(void *optctx, OptionGroup *g)
411 {
412     int i, ret;
413 
414     av_log(NULL, AV_LOG_DEBUG, "Parsing a group of options: %s %s.\n",
415            g->group_def->name, g->arg);
416 
417     for (i = 0; i < g->nb_opts; i++) {
418         Option *o = &g->opts[i];
419 
420         if (g->group_def->flags &&
421             !(g->group_def->flags & o->opt->flags)) {
422             av_log(NULL, AV_LOG_ERROR, "Option %s (%s) cannot be applied to "
423                    "%s %s -- you are trying to apply an input option to an "
424                    "output file or vice versa. Move this option before the "
425                    "file it belongs to.\n", o->key, o->opt->help,
426                    g->group_def->name, g->arg);
427             return AVERROR(EINVAL);
428         }
429 
430         av_log(NULL, AV_LOG_DEBUG, "Applying option %s (%s) with argument %s.\n",
431                o->key, o->opt->help, o->val);
432 
433         ret = write_option(optctx, o->opt, o->key, o->val);
434         if (ret < 0)
435             return ret;
436     }
437 
438     av_log(NULL, AV_LOG_DEBUG, "Successfully parsed a group of options.\n");
439 
440     return 0;
441 }
442 
locate_option(int argc,char ** argv,const OptionDef * options,const char * optname)443 int locate_option(int argc, char **argv, const OptionDef *options,
444                   const char *optname)
445 {
446     const OptionDef *po;
447     int i;
448 
449     for (i = 1; i < argc; i++) {
450         const char *cur_opt = argv[i];
451 
452         if (*cur_opt++ != '-')
453             continue;
454 
455         po = find_option(options, cur_opt);
456         if (!po->name && cur_opt[0] == 'n' && cur_opt[1] == 'o')
457             po = find_option(options, cur_opt + 2);
458 
459         if ((!po->name && !strcmp(cur_opt, optname)) ||
460              (po->name && !strcmp(optname, po->name)))
461             return i;
462 
463         if (!po->name || po->flags & HAS_ARG)
464             i++;
465     }
466     return 0;
467 }
468 
dump_argument(const char * a)469 static void dump_argument(const char *a)
470 {
471     const unsigned char *p;
472 
473     for (p = a; *p; p++)
474         if (!((*p >= '+' && *p <= ':') || (*p >= '@' && *p <= 'Z') ||
475               *p == '_' || (*p >= 'a' && *p <= 'z')))
476             break;
477     if (!*p) {
478         fputs(a, report_file);
479         return;
480     }
481     fputc('"', report_file);
482     for (p = a; *p; p++) {
483         if (*p == '\\' || *p == '"' || *p == '$' || *p == '`')
484             fprintf(report_file, "\\%c", *p);
485         else if (*p < ' ' || *p > '~')
486             fprintf(report_file, "\\x%02x", *p);
487         else
488             fputc(*p, report_file);
489     }
490     fputc('"', report_file);
491 }
492 
check_options(const OptionDef * po)493 static void check_options(const OptionDef *po)
494 {
495     while (po->name) {
496         if (po->flags & OPT_PERFILE)
497             av_assert0(po->flags & (OPT_INPUT | OPT_OUTPUT));
498         po++;
499     }
500 }
501 
parse_loglevel(int argc,char ** argv,const OptionDef * options)502 void parse_loglevel(int argc, char **argv, const OptionDef *options)
503 {
504     int idx = locate_option(argc, argv, options, "loglevel");
505     const char *env;
506 
507     check_options(options);
508 
509     if (!idx)
510         idx = locate_option(argc, argv, options, "v");
511     if (idx && argv[idx + 1])
512         opt_loglevel(NULL, "loglevel", argv[idx + 1]);
513     idx = locate_option(argc, argv, options, "report");
514     if ((env = getenv("FFREPORT")) || idx) {
515         init_report(env);
516         if (report_file) {
517             int i;
518             fprintf(report_file, "Command line:\n");
519             for (i = 0; i < argc; i++) {
520                 dump_argument(argv[i]);
521                 fputc(i < argc - 1 ? ' ' : '\n', report_file);
522             }
523             fflush(report_file);
524         }
525     }
526     idx = locate_option(argc, argv, options, "hide_banner");
527     if (idx)
528         hide_banner = 1;
529 }
530 
opt_find(void * obj,const char * name,const char * unit,int opt_flags,int search_flags)531 static const AVOption *opt_find(void *obj, const char *name, const char *unit,
532                             int opt_flags, int search_flags)
533 {
534     const AVOption *o = av_opt_find(obj, name, unit, opt_flags, search_flags);
535     if(o && !o->flags)
536         return NULL;
537     return o;
538 }
539 
540 #define FLAGS (o->type == AV_OPT_TYPE_FLAGS && (arg[0]=='-' || arg[0]=='+')) ? AV_DICT_APPEND : 0
opt_default(void * optctx,const char * opt,const char * arg)541 int opt_default(void *optctx, const char *opt, const char *arg)
542 {
543     const AVOption *o;
544     int consumed = 0;
545     char opt_stripped[128];
546     const char *p;
547     const AVClass *cc = avcodec_get_class(), *fc = avformat_get_class();
548 #if CONFIG_AVRESAMPLE
549     const AVClass *rc = avresample_get_class();
550 #endif
551 #if CONFIG_SWSCALE
552     const AVClass *sc = sws_get_class();
553 #endif
554 #if CONFIG_SWRESAMPLE
555     const AVClass *swr_class = swr_get_class();
556 #endif
557 
558     if (!strcmp(opt, "debug") || !strcmp(opt, "fdebug"))
559         av_log_set_level(AV_LOG_DEBUG);
560 
561     if (!(p = strchr(opt, ':')))
562         p = opt + strlen(opt);
563     av_strlcpy(opt_stripped, opt, FFMIN(sizeof(opt_stripped), p - opt + 1));
564 
565     if ((o = opt_find(&cc, opt_stripped, NULL, 0,
566                          AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) ||
567         ((opt[0] == 'v' || opt[0] == 'a' || opt[0] == 's') &&
568          (o = opt_find(&cc, opt + 1, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)))) {
569         av_dict_set(&codec_opts, opt, arg, FLAGS);
570         consumed = 1;
571     }
572     if ((o = opt_find(&fc, opt, NULL, 0,
573                          AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
574         av_dict_set(&format_opts, opt, arg, FLAGS);
575         if (consumed)
576             av_log(NULL, AV_LOG_VERBOSE, "Routing option %s to both codec and muxer layer\n", opt);
577         consumed = 1;
578     }
579 #if CONFIG_SWSCALE
580     if (!consumed && (o = opt_find(&sc, opt, NULL, 0,
581                          AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
582         struct SwsContext *sws = sws_alloc_context();
583         int ret = av_opt_set(sws, opt, arg, 0);
584         sws_freeContext(sws);
585         if (!strcmp(opt, "srcw") || !strcmp(opt, "srch") ||
586             !strcmp(opt, "dstw") || !strcmp(opt, "dsth") ||
587             !strcmp(opt, "src_format") || !strcmp(opt, "dst_format")) {
588             av_log(NULL, AV_LOG_ERROR, "Directly using swscale dimensions/format options is not supported, please use the -s or -pix_fmt options\n");
589             return AVERROR(EINVAL);
590         }
591         if (ret < 0) {
592             av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
593             return ret;
594         }
595 
596         av_dict_set(&sws_dict, opt, arg, FLAGS);
597 
598         consumed = 1;
599     }
600 #else
601     if (!consumed && !strcmp(opt, "sws_flags")) {
602         av_log(NULL, AV_LOG_WARNING, "Ignoring %s %s, due to disabled swscale\n", opt, arg);
603         consumed = 1;
604     }
605 #endif
606 #if CONFIG_SWRESAMPLE
607     if (!consumed && (o=opt_find(&swr_class, opt, NULL, 0,
608                                     AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
609         struct SwrContext *swr = swr_alloc();
610         int ret = av_opt_set(swr, opt, arg, 0);
611         swr_free(&swr);
612         if (ret < 0) {
613             av_log(NULL, AV_LOG_ERROR, "Error setting option %s.\n", opt);
614             return ret;
615         }
616         av_dict_set(&swr_opts, opt, arg, FLAGS);
617         consumed = 1;
618     }
619 #endif
620 #if CONFIG_AVRESAMPLE
621     if ((o=opt_find(&rc, opt, NULL, 0,
622                        AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ))) {
623         av_dict_set(&resample_opts, opt, arg, FLAGS);
624         consumed = 1;
625     }
626 #endif
627 
628     if (consumed)
629         return 0;
630     return AVERROR_OPTION_NOT_FOUND;
631 }
632 
633 /*
634  * Check whether given option is a group separator.
635  *
636  * @return index of the group definition that matched or -1 if none
637  */
match_group_separator(const OptionGroupDef * groups,int nb_groups,const char * opt)638 static int match_group_separator(const OptionGroupDef *groups, int nb_groups,
639                                  const char *opt)
640 {
641     int i;
642 
643     for (i = 0; i < nb_groups; i++) {
644         const OptionGroupDef *p = &groups[i];
645         if (p->sep && !strcmp(p->sep, opt))
646             return i;
647     }
648 
649     return -1;
650 }
651 
652 /*
653  * Finish parsing an option group.
654  *
655  * @param group_idx which group definition should this group belong to
656  * @param arg argument of the group delimiting option
657  */
finish_group(OptionParseContext * octx,int group_idx,const char * arg)658 static void finish_group(OptionParseContext *octx, int group_idx,
659                          const char *arg)
660 {
661     OptionGroupList *l = &octx->groups[group_idx];
662     OptionGroup *g;
663 
664     GROW_ARRAY(l->groups, l->nb_groups);
665     g = &l->groups[l->nb_groups - 1];
666 
667     *g             = octx->cur_group;
668     g->arg         = arg;
669     g->group_def   = l->group_def;
670     g->sws_dict    = sws_dict;
671     g->swr_opts    = swr_opts;
672     g->codec_opts  = codec_opts;
673     g->format_opts = format_opts;
674     g->resample_opts = resample_opts;
675 
676     codec_opts  = NULL;
677     format_opts = NULL;
678     resample_opts = NULL;
679     sws_dict    = NULL;
680     swr_opts    = NULL;
681     init_opts();
682 
683     memset(&octx->cur_group, 0, sizeof(octx->cur_group));
684 }
685 
686 /*
687  * Add an option instance to currently parsed group.
688  */
add_opt(OptionParseContext * octx,const OptionDef * opt,const char * key,const char * val)689 static void add_opt(OptionParseContext *octx, const OptionDef *opt,
690                     const char *key, const char *val)
691 {
692     int global = !(opt->flags & (OPT_PERFILE | OPT_SPEC | OPT_OFFSET));
693     OptionGroup *g = global ? &octx->global_opts : &octx->cur_group;
694 
695     GROW_ARRAY(g->opts, g->nb_opts);
696     g->opts[g->nb_opts - 1].opt = opt;
697     g->opts[g->nb_opts - 1].key = key;
698     g->opts[g->nb_opts - 1].val = val;
699 }
700 
init_parse_context(OptionParseContext * octx,const OptionGroupDef * groups,int nb_groups)701 static void init_parse_context(OptionParseContext *octx,
702                                const OptionGroupDef *groups, int nb_groups)
703 {
704     static const OptionGroupDef global_group = { "global" };
705     int i;
706 
707     memset(octx, 0, sizeof(*octx));
708 
709     octx->nb_groups = nb_groups;
710     octx->groups    = av_mallocz_array(octx->nb_groups, sizeof(*octx->groups));
711     if (!octx->groups)
712         exit_program(1);
713 
714     for (i = 0; i < octx->nb_groups; i++)
715         octx->groups[i].group_def = &groups[i];
716 
717     octx->global_opts.group_def = &global_group;
718     octx->global_opts.arg       = "";
719 
720     init_opts();
721 }
722 
uninit_parse_context(OptionParseContext * octx)723 void uninit_parse_context(OptionParseContext *octx)
724 {
725     int i, j;
726 
727     for (i = 0; i < octx->nb_groups; i++) {
728         OptionGroupList *l = &octx->groups[i];
729 
730         for (j = 0; j < l->nb_groups; j++) {
731             av_freep(&l->groups[j].opts);
732             av_dict_free(&l->groups[j].codec_opts);
733             av_dict_free(&l->groups[j].format_opts);
734             av_dict_free(&l->groups[j].resample_opts);
735 
736             av_dict_free(&l->groups[j].sws_dict);
737             av_dict_free(&l->groups[j].swr_opts);
738         }
739         av_freep(&l->groups);
740     }
741     av_freep(&octx->groups);
742 
743     av_freep(&octx->cur_group.opts);
744     av_freep(&octx->global_opts.opts);
745 
746     uninit_opts();
747 }
748 
split_commandline(OptionParseContext * octx,int argc,char * argv[],const OptionDef * options,const OptionGroupDef * groups,int nb_groups)749 int split_commandline(OptionParseContext *octx, int argc, char *argv[],
750                       const OptionDef *options,
751                       const OptionGroupDef *groups, int nb_groups)
752 {
753     int optindex = 1;
754     int dashdash = -2;
755 
756     /* perform system-dependent conversions for arguments list */
757     prepare_app_arguments(&argc, &argv);
758 
759     init_parse_context(octx, groups, nb_groups);
760     av_log(NULL, AV_LOG_DEBUG, "Splitting the commandline.\n");
761 
762     while (optindex < argc) {
763         const char *opt = argv[optindex++], *arg;
764         const OptionDef *po;
765         int ret;
766 
767         av_log(NULL, AV_LOG_DEBUG, "Reading option '%s' ...", opt);
768 
769         if (opt[0] == '-' && opt[1] == '-' && !opt[2]) {
770             dashdash = optindex;
771             continue;
772         }
773         /* unnamed group separators, e.g. output filename */
774         if (opt[0] != '-' || !opt[1] || dashdash+1 == optindex) {
775             finish_group(octx, 0, opt);
776             av_log(NULL, AV_LOG_DEBUG, " matched as %s.\n", groups[0].name);
777             continue;
778         }
779         opt++;
780 
781 #define GET_ARG(arg)                                                           \
782 do {                                                                           \
783     arg = argv[optindex++];                                                    \
784     if (!arg) {                                                                \
785         av_log(NULL, AV_LOG_ERROR, "Missing argument for option '%s'.\n", opt);\
786         return AVERROR(EINVAL);                                                \
787     }                                                                          \
788 } while (0)
789 
790         /* named group separators, e.g. -i */
791         if ((ret = match_group_separator(groups, nb_groups, opt)) >= 0) {
792             GET_ARG(arg);
793             finish_group(octx, ret, arg);
794             av_log(NULL, AV_LOG_DEBUG, " matched as %s with argument '%s'.\n",
795                    groups[ret].name, arg);
796             continue;
797         }
798 
799         /* normal options */
800         po = find_option(options, opt);
801         if (po->name) {
802             if (po->flags & OPT_EXIT) {
803                 /* optional argument, e.g. -h */
804                 arg = argv[optindex++];
805             } else if (po->flags & HAS_ARG) {
806                 GET_ARG(arg);
807             } else {
808                 arg = "1";
809             }
810 
811             add_opt(octx, po, opt, arg);
812             av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
813                    "argument '%s'.\n", po->name, po->help, arg);
814             continue;
815         }
816 
817         /* AVOptions */
818         if (argv[optindex]) {
819             ret = opt_default(NULL, opt, argv[optindex]);
820             if (ret >= 0) {
821                 av_log(NULL, AV_LOG_DEBUG, " matched as AVOption '%s' with "
822                        "argument '%s'.\n", opt, argv[optindex]);
823                 optindex++;
824                 continue;
825             } else if (ret != AVERROR_OPTION_NOT_FOUND) {
826                 av_log(NULL, AV_LOG_ERROR, "Error parsing option '%s' "
827                        "with argument '%s'.\n", opt, argv[optindex]);
828                 return ret;
829             }
830         }
831 
832         /* boolean -nofoo options */
833         if (opt[0] == 'n' && opt[1] == 'o' &&
834             (po = find_option(options, opt + 2)) &&
835             po->name && po->flags & OPT_BOOL) {
836             add_opt(octx, po, opt, "0");
837             av_log(NULL, AV_LOG_DEBUG, " matched as option '%s' (%s) with "
838                    "argument 0.\n", po->name, po->help);
839             continue;
840         }
841 
842         av_log(NULL, AV_LOG_ERROR, "Unrecognized option '%s'.\n", opt);
843         return AVERROR_OPTION_NOT_FOUND;
844     }
845 
846     if (octx->cur_group.nb_opts || codec_opts || format_opts || resample_opts)
847         av_log(NULL, AV_LOG_WARNING, "Trailing option(s) found in the "
848                "command: may be ignored.\n");
849 
850     av_log(NULL, AV_LOG_DEBUG, "Finished splitting the commandline.\n");
851 
852     return 0;
853 }
854 
opt_cpuflags(void * optctx,const char * opt,const char * arg)855 int opt_cpuflags(void *optctx, const char *opt, const char *arg)
856 {
857     int ret;
858     unsigned flags = av_get_cpu_flags();
859 
860     if ((ret = av_parse_cpu_caps(&flags, arg)) < 0)
861         return ret;
862 
863     av_force_cpu_flags(flags);
864     return 0;
865 }
866 
opt_loglevel(void * optctx,const char * opt,const char * arg)867 int opt_loglevel(void *optctx, const char *opt, const char *arg)
868 {
869     const struct { const char *name; int level; } log_levels[] = {
870         { "quiet"  , AV_LOG_QUIET   },
871         { "panic"  , AV_LOG_PANIC   },
872         { "fatal"  , AV_LOG_FATAL   },
873         { "error"  , AV_LOG_ERROR   },
874         { "warning", AV_LOG_WARNING },
875         { "info"   , AV_LOG_INFO    },
876         { "verbose", AV_LOG_VERBOSE },
877         { "debug"  , AV_LOG_DEBUG   },
878         { "trace"  , AV_LOG_TRACE   },
879     };
880     const char *token;
881     char *tail;
882     int flags = av_log_get_flags();
883     int level = av_log_get_level();
884     int cmd, i = 0;
885 
886     av_assert0(arg);
887     while (*arg) {
888         token = arg;
889         if (*token == '+' || *token == '-') {
890             cmd = *token++;
891         } else {
892             cmd = 0;
893         }
894         if (!i && !cmd) {
895             flags = 0;  /* missing relative prefix, build absolute value */
896         }
897         if (!strncmp(token, "repeat", 6)) {
898             if (cmd == '-') {
899                 flags |= AV_LOG_SKIP_REPEATED;
900             } else {
901                 flags &= ~AV_LOG_SKIP_REPEATED;
902             }
903             arg = token + 6;
904         } else if (!strncmp(token, "level", 5)) {
905             if (cmd == '-') {
906                 flags &= ~AV_LOG_PRINT_LEVEL;
907             } else {
908                 flags |= AV_LOG_PRINT_LEVEL;
909             }
910             arg = token + 5;
911         } else {
912             break;
913         }
914         i++;
915     }
916     if (!*arg) {
917         goto end;
918     } else if (*arg == '+') {
919         arg++;
920     } else if (!i) {
921         flags = av_log_get_flags();  /* level value without prefix, reset flags */
922     }
923 
924     for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++) {
925         if (!strcmp(log_levels[i].name, arg)) {
926             level = log_levels[i].level;
927             goto end;
928         }
929     }
930 
931     level = strtol(arg, &tail, 10);
932     if (*tail) {
933         av_log(NULL, AV_LOG_FATAL, "Invalid loglevel \"%s\". "
934                "Possible levels are numbers or:\n", arg);
935         for (i = 0; i < FF_ARRAY_ELEMS(log_levels); i++)
936             av_log(NULL, AV_LOG_FATAL, "\"%s\"\n", log_levels[i].name);
937         exit_program(1);
938     }
939 
940 end:
941     av_log_set_flags(flags);
942     av_log_set_level(level);
943     return 0;
944 }
945 
expand_filename_template(AVBPrint * bp,const char * template,struct tm * tm)946 static void expand_filename_template(AVBPrint *bp, const char *template,
947                                      struct tm *tm)
948 {
949     int c;
950 
951     while ((c = *(template++))) {
952         if (c == '%') {
953             if (!(c = *(template++)))
954                 break;
955             switch (c) {
956             case 'p':
957                 av_bprintf(bp, "%s", program_name);
958                 break;
959             case 't':
960                 av_bprintf(bp, "%04d%02d%02d-%02d%02d%02d",
961                            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
962                            tm->tm_hour, tm->tm_min, tm->tm_sec);
963                 break;
964             case '%':
965                 av_bprint_chars(bp, c, 1);
966                 break;
967             }
968         } else {
969             av_bprint_chars(bp, c, 1);
970         }
971     }
972 }
973 
init_report(const char * env)974 static int init_report(const char *env)
975 {
976     char *filename_template = NULL;
977     char *key, *val;
978     int ret, count = 0;
979     int prog_loglevel, envlevel = 0;
980     time_t now;
981     struct tm *tm;
982     AVBPrint filename;
983 
984     if (report_file) /* already opened */
985         return 0;
986     time(&now);
987     tm = localtime(&now);
988 
989     while (env && *env) {
990         if ((ret = av_opt_get_key_value(&env, "=", ":", 0, &key, &val)) < 0) {
991             if (count)
992                 av_log(NULL, AV_LOG_ERROR,
993                        "Failed to parse FFREPORT environment variable: %s\n",
994                        av_err2str(ret));
995             break;
996         }
997         if (*env)
998             env++;
999         count++;
1000         if (!strcmp(key, "file")) {
1001             av_free(filename_template);
1002             filename_template = val;
1003             val = NULL;
1004         } else if (!strcmp(key, "level")) {
1005             char *tail;
1006             report_file_level = strtol(val, &tail, 10);
1007             if (*tail) {
1008                 av_log(NULL, AV_LOG_FATAL, "Invalid report file level\n");
1009                 exit_program(1);
1010             }
1011             envlevel = 1;
1012         } else {
1013             av_log(NULL, AV_LOG_ERROR, "Unknown key '%s' in FFREPORT\n", key);
1014         }
1015         av_free(val);
1016         av_free(key);
1017     }
1018 
1019     av_bprint_init(&filename, 0, AV_BPRINT_SIZE_AUTOMATIC);
1020     expand_filename_template(&filename,
1021                              av_x_if_null(filename_template, "%p-%t.log"), tm);
1022     av_free(filename_template);
1023     if (!av_bprint_is_complete(&filename)) {
1024         av_log(NULL, AV_LOG_ERROR, "Out of memory building report file name\n");
1025         return AVERROR(ENOMEM);
1026     }
1027 
1028     prog_loglevel = av_log_get_level();
1029     if (!envlevel)
1030         report_file_level = FFMAX(report_file_level, prog_loglevel);
1031 
1032     report_file = fopen(filename.str, "w");
1033     if (!report_file) {
1034         int ret = AVERROR(errno);
1035         av_log(NULL, AV_LOG_ERROR, "Failed to open report \"%s\": %s\n",
1036                filename.str, strerror(errno));
1037         return ret;
1038     }
1039     av_log_set_callback(log_callback_report);
1040     av_log(NULL, AV_LOG_INFO,
1041            "%s started on %04d-%02d-%02d at %02d:%02d:%02d\n"
1042            "Report written to \"%s\"\n"
1043            "Log level: %d\n",
1044            program_name,
1045            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1046            tm->tm_hour, tm->tm_min, tm->tm_sec,
1047            filename.str, report_file_level);
1048     av_bprint_finalize(&filename, NULL);
1049     return 0;
1050 }
1051 
opt_report(void * optctx,const char * opt,const char * arg)1052 int opt_report(void *optctx, const char *opt, const char *arg)
1053 {
1054     return init_report(NULL);
1055 }
1056 
opt_max_alloc(void * optctx,const char * opt,const char * arg)1057 int opt_max_alloc(void *optctx, const char *opt, const char *arg)
1058 {
1059     char *tail;
1060     size_t max;
1061 
1062     max = strtol(arg, &tail, 10);
1063     if (*tail) {
1064         av_log(NULL, AV_LOG_FATAL, "Invalid max_alloc \"%s\".\n", arg);
1065         exit_program(1);
1066     }
1067     av_max_alloc(max);
1068     return 0;
1069 }
1070 
opt_timelimit(void * optctx,const char * opt,const char * arg)1071 int opt_timelimit(void *optctx, const char *opt, const char *arg)
1072 {
1073 #if HAVE_SETRLIMIT
1074     int lim = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
1075     struct rlimit rl = { lim, lim + 1 };
1076     if (setrlimit(RLIMIT_CPU, &rl))
1077         perror("setrlimit");
1078 #else
1079     av_log(NULL, AV_LOG_WARNING, "-%s not implemented on this OS\n", opt);
1080 #endif
1081     return 0;
1082 }
1083 
print_error(const char * filename,int err)1084 void print_error(const char *filename, int err)
1085 {
1086     char errbuf[128];
1087     const char *errbuf_ptr = errbuf;
1088 
1089     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
1090         errbuf_ptr = strerror(AVUNERROR(err));
1091     av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
1092 }
1093 
1094 static int warned_cfg = 0;
1095 
1096 #define INDENT        1
1097 #define SHOW_VERSION  2
1098 #define SHOW_CONFIG   4
1099 #define SHOW_COPYRIGHT 8
1100 
1101 #define PRINT_LIB_INFO(libname, LIBNAME, flags, level)                  \
1102     if (CONFIG_##LIBNAME) {                                             \
1103         const char *indent = flags & INDENT? "  " : "";                 \
1104         if (flags & SHOW_VERSION) {                                     \
1105             unsigned int version = libname##_version();                 \
1106             av_log(NULL, level,                                         \
1107                    "%slib%-11s %2d.%3d.%3d / %2d.%3d.%3d\n",            \
1108                    indent, #libname,                                    \
1109                    LIB##LIBNAME##_VERSION_MAJOR,                        \
1110                    LIB##LIBNAME##_VERSION_MINOR,                        \
1111                    LIB##LIBNAME##_VERSION_MICRO,                        \
1112                    AV_VERSION_MAJOR(version), AV_VERSION_MINOR(version),\
1113                    AV_VERSION_MICRO(version));                          \
1114         }                                                               \
1115         if (flags & SHOW_CONFIG) {                                      \
1116             const char *cfg = libname##_configuration();                \
1117             if (strcmp(FFMPEG_CONFIGURATION, cfg)) {                    \
1118                 if (!warned_cfg) {                                      \
1119                     av_log(NULL, level,                                 \
1120                             "%sWARNING: library configuration mismatch\n", \
1121                             indent);                                    \
1122                     warned_cfg = 1;                                     \
1123                 }                                                       \
1124                 av_log(NULL, level, "%s%-11s configuration: %s\n",      \
1125                         indent, #libname, cfg);                         \
1126             }                                                           \
1127         }                                                               \
1128     }                                                                   \
1129 
print_all_libs_info(int flags,int level)1130 static void print_all_libs_info(int flags, int level)
1131 {
1132     PRINT_LIB_INFO(avutil,     AVUTIL,     flags, level);
1133     PRINT_LIB_INFO(avcodec,    AVCODEC,    flags, level);
1134     PRINT_LIB_INFO(avformat,   AVFORMAT,   flags, level);
1135     PRINT_LIB_INFO(avdevice,   AVDEVICE,   flags, level);
1136     PRINT_LIB_INFO(avfilter,   AVFILTER,   flags, level);
1137     PRINT_LIB_INFO(avresample, AVRESAMPLE, flags, level);
1138     PRINT_LIB_INFO(swscale,    SWSCALE,    flags, level);
1139     PRINT_LIB_INFO(swresample, SWRESAMPLE, flags, level);
1140     PRINT_LIB_INFO(postproc,   POSTPROC,   flags, level);
1141 }
1142 
print_program_info(int flags,int level)1143 static void print_program_info(int flags, int level)
1144 {
1145     const char *indent = flags & INDENT? "  " : "";
1146 
1147     av_log(NULL, level, "%s version " FFMPEG_VERSION, program_name);
1148     if (flags & SHOW_COPYRIGHT)
1149         av_log(NULL, level, " Copyright (c) %d-%d the FFmpeg developers",
1150                program_birth_year, CONFIG_THIS_YEAR);
1151     av_log(NULL, level, "\n");
1152     av_log(NULL, level, "%sbuilt with %s\n", indent, CC_IDENT);
1153 
1154     av_log(NULL, level, "%sconfiguration: " FFMPEG_CONFIGURATION "\n", indent);
1155 }
1156 
print_buildconf(int flags,int level)1157 static void print_buildconf(int flags, int level)
1158 {
1159     const char *indent = flags & INDENT ? "  " : "";
1160     char str[] = { FFMPEG_CONFIGURATION };
1161     char *conflist, *remove_tilde, *splitconf;
1162 
1163     // Change all the ' --' strings to '~--' so that
1164     // they can be identified as tokens.
1165     while ((conflist = strstr(str, " --")) != NULL) {
1166         conflist[0] = '~';
1167     }
1168 
1169     // Compensate for the weirdness this would cause
1170     // when passing 'pkg-config --static'.
1171     while ((remove_tilde = strstr(str, "pkg-config~")) != NULL) {
1172         remove_tilde[sizeof("pkg-config~") - 2] = ' ';
1173     }
1174 
1175     splitconf = strtok(str, "~");
1176     av_log(NULL, level, "\n%sconfiguration:\n", indent);
1177     while (splitconf != NULL) {
1178         av_log(NULL, level, "%s%s%s\n", indent, indent, splitconf);
1179         splitconf = strtok(NULL, "~");
1180     }
1181 }
1182 
show_banner(int argc,char ** argv,const OptionDef * options)1183 void show_banner(int argc, char **argv, const OptionDef *options)
1184 {
1185     int idx = locate_option(argc, argv, options, "version");
1186     if (hide_banner || idx)
1187         return;
1188 
1189     print_program_info (INDENT|SHOW_COPYRIGHT, AV_LOG_INFO);
1190     print_all_libs_info(INDENT|SHOW_CONFIG,  AV_LOG_INFO);
1191     print_all_libs_info(INDENT|SHOW_VERSION, AV_LOG_INFO);
1192 }
1193 
show_version(void * optctx,const char * opt,const char * arg)1194 int show_version(void *optctx, const char *opt, const char *arg)
1195 {
1196     av_log_set_callback(log_callback_help);
1197     print_program_info (SHOW_COPYRIGHT, AV_LOG_INFO);
1198     print_all_libs_info(SHOW_VERSION, AV_LOG_INFO);
1199 
1200     return 0;
1201 }
1202 
show_buildconf(void * optctx,const char * opt,const char * arg)1203 int show_buildconf(void *optctx, const char *opt, const char *arg)
1204 {
1205     av_log_set_callback(log_callback_help);
1206     print_buildconf      (INDENT|0, AV_LOG_INFO);
1207 
1208     return 0;
1209 }
1210 
show_license(void * optctx,const char * opt,const char * arg)1211 int show_license(void *optctx, const char *opt, const char *arg)
1212 {
1213 #if CONFIG_NONFREE
1214     printf(
1215     "This version of %s has nonfree parts compiled in.\n"
1216     "Therefore it is not legally redistributable.\n",
1217     program_name );
1218 #elif CONFIG_GPLV3
1219     printf(
1220     "%s is free software; you can redistribute it and/or modify\n"
1221     "it under the terms of the GNU General Public License as published by\n"
1222     "the Free Software Foundation; either version 3 of the License, or\n"
1223     "(at your option) any later version.\n"
1224     "\n"
1225     "%s is distributed in the hope that it will be useful,\n"
1226     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
1227     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
1228     "GNU General Public License for more details.\n"
1229     "\n"
1230     "You should have received a copy of the GNU General Public License\n"
1231     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
1232     program_name, program_name, program_name );
1233 #elif CONFIG_GPL
1234     printf(
1235     "%s is free software; you can redistribute it and/or modify\n"
1236     "it under the terms of the GNU General Public License as published by\n"
1237     "the Free Software Foundation; either version 2 of the License, or\n"
1238     "(at your option) any later version.\n"
1239     "\n"
1240     "%s is distributed in the hope that it will be useful,\n"
1241     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
1242     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
1243     "GNU General Public License for more details.\n"
1244     "\n"
1245     "You should have received a copy of the GNU General Public License\n"
1246     "along with %s; if not, write to the Free Software\n"
1247     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
1248     program_name, program_name, program_name );
1249 #elif CONFIG_LGPLV3
1250     printf(
1251     "%s is free software; you can redistribute it and/or modify\n"
1252     "it under the terms of the GNU Lesser General Public License as published by\n"
1253     "the Free Software Foundation; either version 3 of the License, or\n"
1254     "(at your option) any later version.\n"
1255     "\n"
1256     "%s is distributed in the hope that it will be useful,\n"
1257     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
1258     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
1259     "GNU Lesser General Public License for more details.\n"
1260     "\n"
1261     "You should have received a copy of the GNU Lesser General Public License\n"
1262     "along with %s.  If not, see <http://www.gnu.org/licenses/>.\n",
1263     program_name, program_name, program_name );
1264 #else
1265     printf(
1266     "%s is free software; you can redistribute it and/or\n"
1267     "modify it under the terms of the GNU Lesser General Public\n"
1268     "License as published by the Free Software Foundation; either\n"
1269     "version 2.1 of the License, or (at your option) any later version.\n"
1270     "\n"
1271     "%s is distributed in the hope that it will be useful,\n"
1272     "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
1273     "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
1274     "Lesser General Public License for more details.\n"
1275     "\n"
1276     "You should have received a copy of the GNU Lesser General Public\n"
1277     "License along with %s; if not, write to the Free Software\n"
1278     "Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\n",
1279     program_name, program_name, program_name );
1280 #endif
1281 
1282     return 0;
1283 }
1284 
is_device(const AVClass * avclass)1285 static int is_device(const AVClass *avclass)
1286 {
1287     if (!avclass)
1288         return 0;
1289     return AV_IS_INPUT_DEVICE(avclass->category) || AV_IS_OUTPUT_DEVICE(avclass->category);
1290 }
1291 
show_formats_devices(void * optctx,const char * opt,const char * arg,int device_only,int muxdemuxers)1292 static int show_formats_devices(void *optctx, const char *opt, const char *arg, int device_only, int muxdemuxers)
1293 {
1294     void *ifmt_opaque = NULL;
1295     const AVInputFormat *ifmt  = NULL;
1296     void *ofmt_opaque = NULL;
1297     const AVOutputFormat *ofmt = NULL;
1298     const char *last_name;
1299     int is_dev;
1300 
1301     printf("%s\n"
1302            " D. = Demuxing supported\n"
1303            " .E = Muxing supported\n"
1304            " --\n", device_only ? "Devices:" : "File formats:");
1305     last_name = "000";
1306     for (;;) {
1307         int decode = 0;
1308         int encode = 0;
1309         const char *name      = NULL;
1310         const char *long_name = NULL;
1311 
1312         if (muxdemuxers !=SHOW_DEMUXERS) {
1313             ofmt_opaque = NULL;
1314             while ((ofmt = av_muxer_iterate(&ofmt_opaque))) {
1315                 is_dev = is_device(ofmt->priv_class);
1316                 if (!is_dev && device_only)
1317                     continue;
1318                 if ((!name || strcmp(ofmt->name, name) < 0) &&
1319                     strcmp(ofmt->name, last_name) > 0) {
1320                     name      = ofmt->name;
1321                     long_name = ofmt->long_name;
1322                     encode    = 1;
1323                 }
1324             }
1325         }
1326         if (muxdemuxers != SHOW_MUXERS) {
1327             ifmt_opaque = NULL;
1328             while ((ifmt = av_demuxer_iterate(&ifmt_opaque))) {
1329                 is_dev = is_device(ifmt->priv_class);
1330                 if (!is_dev && device_only)
1331                     continue;
1332                 if ((!name || strcmp(ifmt->name, name) < 0) &&
1333                     strcmp(ifmt->name, last_name) > 0) {
1334                     name      = ifmt->name;
1335                     long_name = ifmt->long_name;
1336                     encode    = 0;
1337                 }
1338                 if (name && strcmp(ifmt->name, name) == 0)
1339                     decode = 1;
1340             }
1341         }
1342         if (!name)
1343             break;
1344         last_name = name;
1345 
1346         printf(" %s%s %-15s %s\n",
1347                decode ? "D" : " ",
1348                encode ? "E" : " ",
1349                name,
1350             long_name ? long_name:" ");
1351     }
1352     return 0;
1353 }
1354 
show_formats(void * optctx,const char * opt,const char * arg)1355 int show_formats(void *optctx, const char *opt, const char *arg)
1356 {
1357     return show_formats_devices(optctx, opt, arg, 0, SHOW_DEFAULT);
1358 }
1359 
show_muxers(void * optctx,const char * opt,const char * arg)1360 int show_muxers(void *optctx, const char *opt, const char *arg)
1361 {
1362     return show_formats_devices(optctx, opt, arg, 0, SHOW_MUXERS);
1363 }
1364 
show_demuxers(void * optctx,const char * opt,const char * arg)1365 int show_demuxers(void *optctx, const char *opt, const char *arg)
1366 {
1367     return show_formats_devices(optctx, opt, arg, 0, SHOW_DEMUXERS);
1368 }
1369 
show_devices(void * optctx,const char * opt,const char * arg)1370 int show_devices(void *optctx, const char *opt, const char *arg)
1371 {
1372     return show_formats_devices(optctx, opt, arg, 1, SHOW_DEFAULT);
1373 }
1374 
1375 #define PRINT_CODEC_SUPPORTED(codec, field, type, list_name, term, get_name) \
1376     if (codec->field) {                                                      \
1377         const type *p = codec->field;                                        \
1378                                                                              \
1379         printf("    Supported " list_name ":");                              \
1380         while (*p != term) {                                                 \
1381             get_name(*p);                                                    \
1382             printf(" %s", name);                                             \
1383             p++;                                                             \
1384         }                                                                    \
1385         printf("\n");                                                        \
1386     }                                                                        \
1387 
print_codec(const AVCodec * c)1388 static void print_codec(const AVCodec *c)
1389 {
1390     int encoder = av_codec_is_encoder(c);
1391 
1392     printf("%s %s [%s]:\n", encoder ? "Encoder" : "Decoder", c->name,
1393            c->long_name ? c->long_name : "");
1394 
1395     printf("    General capabilities: ");
1396     if (c->capabilities & AV_CODEC_CAP_DRAW_HORIZ_BAND)
1397         printf("horizband ");
1398     if (c->capabilities & AV_CODEC_CAP_DR1)
1399         printf("dr1 ");
1400     if (c->capabilities & AV_CODEC_CAP_TRUNCATED)
1401         printf("trunc ");
1402     if (c->capabilities & AV_CODEC_CAP_DELAY)
1403         printf("delay ");
1404     if (c->capabilities & AV_CODEC_CAP_SMALL_LAST_FRAME)
1405         printf("small ");
1406     if (c->capabilities & AV_CODEC_CAP_SUBFRAMES)
1407         printf("subframes ");
1408     if (c->capabilities & AV_CODEC_CAP_EXPERIMENTAL)
1409         printf("exp ");
1410     if (c->capabilities & AV_CODEC_CAP_CHANNEL_CONF)
1411         printf("chconf ");
1412     if (c->capabilities & AV_CODEC_CAP_PARAM_CHANGE)
1413         printf("paramchange ");
1414     if (c->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
1415         printf("variable ");
1416     if (c->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
1417                            AV_CODEC_CAP_SLICE_THREADS |
1418                            AV_CODEC_CAP_OTHER_THREADS))
1419         printf("threads ");
1420     if (c->capabilities & AV_CODEC_CAP_AVOID_PROBING)
1421         printf("avoidprobe ");
1422     if (c->capabilities & AV_CODEC_CAP_HARDWARE)
1423         printf("hardware ");
1424     if (c->capabilities & AV_CODEC_CAP_HYBRID)
1425         printf("hybrid ");
1426     if (!c->capabilities)
1427         printf("none");
1428     printf("\n");
1429 
1430     if (c->type == AVMEDIA_TYPE_VIDEO ||
1431         c->type == AVMEDIA_TYPE_AUDIO) {
1432         printf("    Threading capabilities: ");
1433         switch (c->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
1434                                    AV_CODEC_CAP_SLICE_THREADS |
1435                                    AV_CODEC_CAP_OTHER_THREADS)) {
1436         case AV_CODEC_CAP_FRAME_THREADS |
1437              AV_CODEC_CAP_SLICE_THREADS: printf("frame and slice"); break;
1438         case AV_CODEC_CAP_FRAME_THREADS: printf("frame");           break;
1439         case AV_CODEC_CAP_SLICE_THREADS: printf("slice");           break;
1440         case AV_CODEC_CAP_OTHER_THREADS: printf("other");           break;
1441         default:                         printf("none");            break;
1442         }
1443         printf("\n");
1444     }
1445 
1446     if (avcodec_get_hw_config(c, 0)) {
1447         printf("    Supported hardware devices: ");
1448         for (int i = 0;; i++) {
1449             const AVCodecHWConfig *config = avcodec_get_hw_config(c, i);
1450             if (!config)
1451                 break;
1452             printf("%s ", av_hwdevice_get_type_name(config->device_type));
1453         }
1454         printf("\n");
1455     }
1456 
1457     if (c->supported_framerates) {
1458         const AVRational *fps = c->supported_framerates;
1459 
1460         printf("    Supported framerates:");
1461         while (fps->num) {
1462             printf(" %d/%d", fps->num, fps->den);
1463             fps++;
1464         }
1465         printf("\n");
1466     }
1467     PRINT_CODEC_SUPPORTED(c, pix_fmts, enum AVPixelFormat, "pixel formats",
1468                           AV_PIX_FMT_NONE, GET_PIX_FMT_NAME);
1469     PRINT_CODEC_SUPPORTED(c, supported_samplerates, int, "sample rates", 0,
1470                           GET_SAMPLE_RATE_NAME);
1471     PRINT_CODEC_SUPPORTED(c, sample_fmts, enum AVSampleFormat, "sample formats",
1472                           AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME);
1473     PRINT_CODEC_SUPPORTED(c, channel_layouts, uint64_t, "channel layouts",
1474                           0, GET_CH_LAYOUT_DESC);
1475 
1476     if (c->priv_class) {
1477         show_help_children(c->priv_class,
1478                            AV_OPT_FLAG_ENCODING_PARAM |
1479                            AV_OPT_FLAG_DECODING_PARAM);
1480     }
1481 }
1482 
get_media_type_char(enum AVMediaType type)1483 static char get_media_type_char(enum AVMediaType type)
1484 {
1485     switch (type) {
1486         case AVMEDIA_TYPE_VIDEO:    return 'V';
1487         case AVMEDIA_TYPE_AUDIO:    return 'A';
1488         case AVMEDIA_TYPE_DATA:     return 'D';
1489         case AVMEDIA_TYPE_SUBTITLE: return 'S';
1490         case AVMEDIA_TYPE_ATTACHMENT:return 'T';
1491         default:                    return '?';
1492     }
1493 }
1494 
next_codec_for_id(enum AVCodecID id,void ** iter,int encoder)1495 static const AVCodec *next_codec_for_id(enum AVCodecID id, void **iter,
1496                                         int encoder)
1497 {
1498     const AVCodec *c;
1499     while ((c = av_codec_iterate(iter))) {
1500         if (c->id == id &&
1501             (encoder ? av_codec_is_encoder(c) : av_codec_is_decoder(c)))
1502             return c;
1503     }
1504     return NULL;
1505 }
1506 
compare_codec_desc(const void * a,const void * b)1507 static int compare_codec_desc(const void *a, const void *b)
1508 {
1509     const AVCodecDescriptor * const *da = a;
1510     const AVCodecDescriptor * const *db = b;
1511 
1512     return (*da)->type != (*db)->type ? FFDIFFSIGN((*da)->type, (*db)->type) :
1513            strcmp((*da)->name, (*db)->name);
1514 }
1515 
get_codecs_sorted(const AVCodecDescriptor *** rcodecs)1516 static unsigned get_codecs_sorted(const AVCodecDescriptor ***rcodecs)
1517 {
1518     const AVCodecDescriptor *desc = NULL;
1519     const AVCodecDescriptor **codecs;
1520     unsigned nb_codecs = 0, i = 0;
1521 
1522     while ((desc = avcodec_descriptor_next(desc)))
1523         nb_codecs++;
1524     if (!(codecs = av_calloc(nb_codecs, sizeof(*codecs)))) {
1525         av_log(NULL, AV_LOG_ERROR, "Out of memory\n");
1526         exit_program(1);
1527     }
1528     desc = NULL;
1529     while ((desc = avcodec_descriptor_next(desc)))
1530         codecs[i++] = desc;
1531     av_assert0(i == nb_codecs);
1532     qsort(codecs, nb_codecs, sizeof(*codecs), compare_codec_desc);
1533     *rcodecs = codecs;
1534     return nb_codecs;
1535 }
1536 
print_codecs_for_id(enum AVCodecID id,int encoder)1537 static void print_codecs_for_id(enum AVCodecID id, int encoder)
1538 {
1539     void *iter = NULL;
1540     const AVCodec *codec;
1541 
1542     printf(" (%s: ", encoder ? "encoders" : "decoders");
1543 
1544     while ((codec = next_codec_for_id(id, &iter, encoder)))
1545         printf("%s ", codec->name);
1546 
1547     printf(")");
1548 }
1549 
show_codecs(void * optctx,const char * opt,const char * arg)1550 int show_codecs(void *optctx, const char *opt, const char *arg)
1551 {
1552     const AVCodecDescriptor **codecs;
1553     unsigned i, nb_codecs = get_codecs_sorted(&codecs);
1554 
1555     printf("Codecs:\n"
1556            " D..... = Decoding supported\n"
1557            " .E.... = Encoding supported\n"
1558            " ..V... = Video codec\n"
1559            " ..A... = Audio codec\n"
1560            " ..S... = Subtitle codec\n"
1561            " ...I.. = Intra frame-only codec\n"
1562            " ....L. = Lossy compression\n"
1563            " .....S = Lossless compression\n"
1564            " -------\n");
1565     for (i = 0; i < nb_codecs; i++) {
1566         const AVCodecDescriptor *desc = codecs[i];
1567         const AVCodec *codec;
1568         void *iter = NULL;
1569 
1570         if (strstr(desc->name, "_deprecated"))
1571             continue;
1572 
1573         printf(" ");
1574         printf(avcodec_find_decoder(desc->id) ? "D" : ".");
1575         printf(avcodec_find_encoder(desc->id) ? "E" : ".");
1576 
1577         printf("%c", get_media_type_char(desc->type));
1578         printf((desc->props & AV_CODEC_PROP_INTRA_ONLY) ? "I" : ".");
1579         printf((desc->props & AV_CODEC_PROP_LOSSY)      ? "L" : ".");
1580         printf((desc->props & AV_CODEC_PROP_LOSSLESS)   ? "S" : ".");
1581 
1582         printf(" %-20s %s", desc->name, desc->long_name ? desc->long_name : "");
1583 
1584         /* print decoders/encoders when there's more than one or their
1585          * names are different from codec name */
1586         while ((codec = next_codec_for_id(desc->id, &iter, 0))) {
1587             if (strcmp(codec->name, desc->name)) {
1588                 print_codecs_for_id(desc->id, 0);
1589                 break;
1590             }
1591         }
1592         iter = NULL;
1593         while ((codec = next_codec_for_id(desc->id, &iter, 1))) {
1594             if (strcmp(codec->name, desc->name)) {
1595                 print_codecs_for_id(desc->id, 1);
1596                 break;
1597             }
1598         }
1599 
1600         printf("\n");
1601     }
1602     av_free(codecs);
1603     return 0;
1604 }
1605 
print_codecs(int encoder)1606 static void print_codecs(int encoder)
1607 {
1608     const AVCodecDescriptor **codecs;
1609     unsigned i, nb_codecs = get_codecs_sorted(&codecs);
1610 
1611     printf("%s:\n"
1612            " V..... = Video\n"
1613            " A..... = Audio\n"
1614            " S..... = Subtitle\n"
1615            " .F.... = Frame-level multithreading\n"
1616            " ..S... = Slice-level multithreading\n"
1617            " ...X.. = Codec is experimental\n"
1618            " ....B. = Supports draw_horiz_band\n"
1619            " .....D = Supports direct rendering method 1\n"
1620            " ------\n",
1621            encoder ? "Encoders" : "Decoders");
1622     for (i = 0; i < nb_codecs; i++) {
1623         const AVCodecDescriptor *desc = codecs[i];
1624         const AVCodec *codec;
1625         void *iter = NULL;
1626 
1627         while ((codec = next_codec_for_id(desc->id, &iter, encoder))) {
1628             printf(" %c", get_media_type_char(desc->type));
1629             printf((codec->capabilities & AV_CODEC_CAP_FRAME_THREADS) ? "F" : ".");
1630             printf((codec->capabilities & AV_CODEC_CAP_SLICE_THREADS) ? "S" : ".");
1631             printf((codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL)  ? "X" : ".");
1632             printf((codec->capabilities & AV_CODEC_CAP_DRAW_HORIZ_BAND)?"B" : ".");
1633             printf((codec->capabilities & AV_CODEC_CAP_DR1)           ? "D" : ".");
1634 
1635             printf(" %-20s %s", codec->name, codec->long_name ? codec->long_name : "");
1636             if (strcmp(codec->name, desc->name))
1637                 printf(" (codec %s)", desc->name);
1638 
1639             printf("\n");
1640         }
1641     }
1642     av_free(codecs);
1643 }
1644 
show_decoders(void * optctx,const char * opt,const char * arg)1645 int show_decoders(void *optctx, const char *opt, const char *arg)
1646 {
1647     print_codecs(0);
1648     return 0;
1649 }
1650 
show_encoders(void * optctx,const char * opt,const char * arg)1651 int show_encoders(void *optctx, const char *opt, const char *arg)
1652 {
1653     print_codecs(1);
1654     return 0;
1655 }
1656 
show_bsfs(void * optctx,const char * opt,const char * arg)1657 int show_bsfs(void *optctx, const char *opt, const char *arg)
1658 {
1659     const AVBitStreamFilter *bsf = NULL;
1660     void *opaque = NULL;
1661 
1662     printf("Bitstream filters:\n");
1663     while ((bsf = av_bsf_iterate(&opaque)))
1664         printf("%s\n", bsf->name);
1665     printf("\n");
1666     return 0;
1667 }
1668 
show_protocols(void * optctx,const char * opt,const char * arg)1669 int show_protocols(void *optctx, const char *opt, const char *arg)
1670 {
1671     void *opaque = NULL;
1672     const char *name;
1673 
1674     printf("Supported file protocols:\n"
1675            "Input:\n");
1676     while ((name = avio_enum_protocols(&opaque, 0)))
1677         printf("  %s\n", name);
1678     printf("Output:\n");
1679     while ((name = avio_enum_protocols(&opaque, 1)))
1680         printf("  %s\n", name);
1681     return 0;
1682 }
1683 
show_filters(void * optctx,const char * opt,const char * arg)1684 int show_filters(void *optctx, const char *opt, const char *arg)
1685 {
1686 #if CONFIG_AVFILTER
1687     const AVFilter *filter = NULL;
1688     char descr[64], *descr_cur;
1689     void *opaque = NULL;
1690     int i, j;
1691     const AVFilterPad *pad;
1692 
1693     printf("Filters:\n"
1694            "  T.. = Timeline support\n"
1695            "  .S. = Slice threading\n"
1696            "  ..C = Command support\n"
1697            "  A = Audio input/output\n"
1698            "  V = Video input/output\n"
1699            "  N = Dynamic number and/or type of input/output\n"
1700            "  | = Source or sink filter\n");
1701     while ((filter = av_filter_iterate(&opaque))) {
1702         descr_cur = descr;
1703         for (i = 0; i < 2; i++) {
1704             if (i) {
1705                 *(descr_cur++) = '-';
1706                 *(descr_cur++) = '>';
1707             }
1708             pad = i ? filter->outputs : filter->inputs;
1709             for (j = 0; pad && avfilter_pad_get_name(pad, j); j++) {
1710                 if (descr_cur >= descr + sizeof(descr) - 4)
1711                     break;
1712                 *(descr_cur++) = get_media_type_char(avfilter_pad_get_type(pad, j));
1713             }
1714             if (!j)
1715                 *(descr_cur++) = ((!i && (filter->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)) ||
1716                                   ( i && (filter->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS))) ? 'N' : '|';
1717         }
1718         *descr_cur = 0;
1719         printf(" %c%c%c %-17s %-10s %s\n",
1720                filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE ? 'T' : '.',
1721                filter->flags & AVFILTER_FLAG_SLICE_THREADS    ? 'S' : '.',
1722                filter->process_command                        ? 'C' : '.',
1723                filter->name, descr, filter->description);
1724     }
1725 #else
1726     printf("No filters available: libavfilter disabled\n");
1727 #endif
1728     return 0;
1729 }
1730 
show_colors(void * optctx,const char * opt,const char * arg)1731 int show_colors(void *optctx, const char *opt, const char *arg)
1732 {
1733     const char *name;
1734     const uint8_t *rgb;
1735     int i;
1736 
1737     printf("%-32s #RRGGBB\n", "name");
1738 
1739     for (i = 0; name = av_get_known_color_name(i, &rgb); i++)
1740         printf("%-32s #%02x%02x%02x\n", name, rgb[0], rgb[1], rgb[2]);
1741 
1742     return 0;
1743 }
1744 
show_pix_fmts(void * optctx,const char * opt,const char * arg)1745 int show_pix_fmts(void *optctx, const char *opt, const char *arg)
1746 {
1747     const AVPixFmtDescriptor *pix_desc = NULL;
1748 
1749     printf("Pixel formats:\n"
1750            "I.... = Supported Input  format for conversion\n"
1751            ".O... = Supported Output format for conversion\n"
1752            "..H.. = Hardware accelerated format\n"
1753            "...P. = Paletted format\n"
1754            "....B = Bitstream format\n"
1755            "FLAGS NAME            NB_COMPONENTS BITS_PER_PIXEL\n"
1756            "-----\n");
1757 
1758 #if !CONFIG_SWSCALE
1759 #   define sws_isSupportedInput(x)  0
1760 #   define sws_isSupportedOutput(x) 0
1761 #endif
1762 
1763     while ((pix_desc = av_pix_fmt_desc_next(pix_desc))) {
1764         enum AVPixelFormat av_unused pix_fmt = av_pix_fmt_desc_get_id(pix_desc);
1765         printf("%c%c%c%c%c %-16s       %d            %2d\n",
1766                sws_isSupportedInput (pix_fmt)              ? 'I' : '.',
1767                sws_isSupportedOutput(pix_fmt)              ? 'O' : '.',
1768                pix_desc->flags & AV_PIX_FMT_FLAG_HWACCEL   ? 'H' : '.',
1769                pix_desc->flags & AV_PIX_FMT_FLAG_PAL       ? 'P' : '.',
1770                pix_desc->flags & AV_PIX_FMT_FLAG_BITSTREAM ? 'B' : '.',
1771                pix_desc->name,
1772                pix_desc->nb_components,
1773                av_get_bits_per_pixel(pix_desc));
1774     }
1775     return 0;
1776 }
1777 
show_layouts(void * optctx,const char * opt,const char * arg)1778 int show_layouts(void *optctx, const char *opt, const char *arg)
1779 {
1780     int i = 0;
1781     uint64_t layout, j;
1782     const char *name, *descr;
1783 
1784     printf("Individual channels:\n"
1785            "NAME           DESCRIPTION\n");
1786     for (i = 0; i < 63; i++) {
1787         name = av_get_channel_name((uint64_t)1 << i);
1788         if (!name)
1789             continue;
1790         descr = av_get_channel_description((uint64_t)1 << i);
1791         printf("%-14s %s\n", name, descr);
1792     }
1793     printf("\nStandard channel layouts:\n"
1794            "NAME           DECOMPOSITION\n");
1795     for (i = 0; !av_get_standard_channel_layout(i, &layout, &name); i++) {
1796         if (name) {
1797             printf("%-14s ", name);
1798             for (j = 1; j; j <<= 1)
1799                 if ((layout & j))
1800                     printf("%s%s", (layout & (j - 1)) ? "+" : "", av_get_channel_name(j));
1801             printf("\n");
1802         }
1803     }
1804     return 0;
1805 }
1806 
show_sample_fmts(void * optctx,const char * opt,const char * arg)1807 int show_sample_fmts(void *optctx, const char *opt, const char *arg)
1808 {
1809     int i;
1810     char fmt_str[128];
1811     for (i = -1; i < AV_SAMPLE_FMT_NB; i++)
1812         printf("%s\n", av_get_sample_fmt_string(fmt_str, sizeof(fmt_str), i));
1813     return 0;
1814 }
1815 
show_help_codec(const char * name,int encoder)1816 static void show_help_codec(const char *name, int encoder)
1817 {
1818     const AVCodecDescriptor *desc;
1819     const AVCodec *codec;
1820 
1821     if (!name) {
1822         av_log(NULL, AV_LOG_ERROR, "No codec name specified.\n");
1823         return;
1824     }
1825 
1826     codec = encoder ? avcodec_find_encoder_by_name(name) :
1827                       avcodec_find_decoder_by_name(name);
1828 
1829     if (codec)
1830         print_codec(codec);
1831     else if ((desc = avcodec_descriptor_get_by_name(name))) {
1832         void *iter = NULL;
1833         int printed = 0;
1834 
1835         while ((codec = next_codec_for_id(desc->id, &iter, encoder))) {
1836             printed = 1;
1837             print_codec(codec);
1838         }
1839 
1840         if (!printed) {
1841             av_log(NULL, AV_LOG_ERROR, "Codec '%s' is known to FFmpeg, "
1842                    "but no %s for it are available. FFmpeg might need to be "
1843                    "recompiled with additional external libraries.\n",
1844                    name, encoder ? "encoders" : "decoders");
1845         }
1846     } else {
1847         av_log(NULL, AV_LOG_ERROR, "Codec '%s' is not recognized by FFmpeg.\n",
1848                name);
1849     }
1850 }
1851 
show_help_demuxer(const char * name)1852 static void show_help_demuxer(const char *name)
1853 {
1854     const AVInputFormat *fmt = av_find_input_format(name);
1855 
1856     if (!fmt) {
1857         av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
1858         return;
1859     }
1860 
1861     printf("Demuxer %s [%s]:\n", fmt->name, fmt->long_name);
1862 
1863     if (fmt->extensions)
1864         printf("    Common extensions: %s.\n", fmt->extensions);
1865 
1866     if (fmt->priv_class)
1867         show_help_children(fmt->priv_class, AV_OPT_FLAG_DECODING_PARAM);
1868 }
1869 
show_help_protocol(const char * name)1870 static void show_help_protocol(const char *name)
1871 {
1872     const AVClass *proto_class;
1873 
1874     if (!name) {
1875         av_log(NULL, AV_LOG_ERROR, "No protocol name specified.\n");
1876         return;
1877     }
1878 
1879     proto_class = avio_protocol_get_class(name);
1880     if (!proto_class) {
1881         av_log(NULL, AV_LOG_ERROR, "Unknown protocol '%s'.\n", name);
1882         return;
1883     }
1884 
1885     show_help_children(proto_class, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM);
1886 }
1887 
show_help_muxer(const char * name)1888 static void show_help_muxer(const char *name)
1889 {
1890     const AVCodecDescriptor *desc;
1891     const AVOutputFormat *fmt = av_guess_format(name, NULL, NULL);
1892 
1893     if (!fmt) {
1894         av_log(NULL, AV_LOG_ERROR, "Unknown format '%s'.\n", name);
1895         return;
1896     }
1897 
1898     printf("Muxer %s [%s]:\n", fmt->name, fmt->long_name);
1899 
1900     if (fmt->extensions)
1901         printf("    Common extensions: %s.\n", fmt->extensions);
1902     if (fmt->mime_type)
1903         printf("    Mime type: %s.\n", fmt->mime_type);
1904     if (fmt->video_codec != AV_CODEC_ID_NONE &&
1905         (desc = avcodec_descriptor_get(fmt->video_codec))) {
1906         printf("    Default video codec: %s.\n", desc->name);
1907     }
1908     if (fmt->audio_codec != AV_CODEC_ID_NONE &&
1909         (desc = avcodec_descriptor_get(fmt->audio_codec))) {
1910         printf("    Default audio codec: %s.\n", desc->name);
1911     }
1912     if (fmt->subtitle_codec != AV_CODEC_ID_NONE &&
1913         (desc = avcodec_descriptor_get(fmt->subtitle_codec))) {
1914         printf("    Default subtitle codec: %s.\n", desc->name);
1915     }
1916 
1917     if (fmt->priv_class)
1918         show_help_children(fmt->priv_class, AV_OPT_FLAG_ENCODING_PARAM);
1919 }
1920 
1921 #if CONFIG_AVFILTER
show_help_filter(const char * name)1922 static void show_help_filter(const char *name)
1923 {
1924 #if CONFIG_AVFILTER
1925     const AVFilter *f = avfilter_get_by_name(name);
1926     int i, count;
1927 
1928     if (!name) {
1929         av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
1930         return;
1931     } else if (!f) {
1932         av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);
1933         return;
1934     }
1935 
1936     printf("Filter %s\n", f->name);
1937     if (f->description)
1938         printf("  %s\n", f->description);
1939 
1940     if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
1941         printf("    slice threading supported\n");
1942 
1943     printf("    Inputs:\n");
1944     count = avfilter_pad_count(f->inputs);
1945     for (i = 0; i < count; i++) {
1946         printf("       #%d: %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
1947                media_type_string(avfilter_pad_get_type(f->inputs, i)));
1948     }
1949     if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
1950         printf("        dynamic (depending on the options)\n");
1951     else if (!count)
1952         printf("        none (source filter)\n");
1953 
1954     printf("    Outputs:\n");
1955     count = avfilter_pad_count(f->outputs);
1956     for (i = 0; i < count; i++) {
1957         printf("       #%d: %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),
1958                media_type_string(avfilter_pad_get_type(f->outputs, i)));
1959     }
1960     if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
1961         printf("        dynamic (depending on the options)\n");
1962     else if (!count)
1963         printf("        none (sink filter)\n");
1964 
1965     if (f->priv_class)
1966         show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM |
1967                                           AV_OPT_FLAG_AUDIO_PARAM);
1968     if (f->flags & AVFILTER_FLAG_SUPPORT_TIMELINE)
1969         printf("This filter has support for timeline through the 'enable' option.\n");
1970 #else
1971     av_log(NULL, AV_LOG_ERROR, "Build without libavfilter; "
1972            "can not to satisfy request\n");
1973 #endif
1974 }
1975 #endif
1976 
show_help_bsf(const char * name)1977 static void show_help_bsf(const char *name)
1978 {
1979     const AVBitStreamFilter *bsf = av_bsf_get_by_name(name);
1980 
1981     if (!name) {
1982         av_log(NULL, AV_LOG_ERROR, "No bitstream filter name specified.\n");
1983         return;
1984     } else if (!bsf) {
1985         av_log(NULL, AV_LOG_ERROR, "Unknown bit stream filter '%s'.\n", name);
1986         return;
1987     }
1988 
1989     printf("Bit stream filter %s\n", bsf->name);
1990     PRINT_CODEC_SUPPORTED(bsf, codec_ids, enum AVCodecID, "codecs",
1991                           AV_CODEC_ID_NONE, GET_CODEC_NAME);
1992     if (bsf->priv_class)
1993         show_help_children(bsf->priv_class, AV_OPT_FLAG_BSF_PARAM);
1994 }
1995 
show_help(void * optctx,const char * opt,const char * arg)1996 int show_help(void *optctx, const char *opt, const char *arg)
1997 {
1998     char *topic, *par;
1999     av_log_set_callback(log_callback_help);
2000 
2001     topic = av_strdup(arg ? arg : "");
2002     if (!topic)
2003         return AVERROR(ENOMEM);
2004     par = strchr(topic, '=');
2005     if (par)
2006         *par++ = 0;
2007 
2008     if (!*topic) {
2009         show_help_default(topic, par);
2010     } else if (!strcmp(topic, "decoder")) {
2011         show_help_codec(par, 0);
2012     } else if (!strcmp(topic, "encoder")) {
2013         show_help_codec(par, 1);
2014     } else if (!strcmp(topic, "demuxer")) {
2015         show_help_demuxer(par);
2016     } else if (!strcmp(topic, "muxer")) {
2017         show_help_muxer(par);
2018     } else if (!strcmp(topic, "protocol")) {
2019         show_help_protocol(par);
2020 #if CONFIG_AVFILTER
2021     } else if (!strcmp(topic, "filter")) {
2022         show_help_filter(par);
2023 #endif
2024     } else if (!strcmp(topic, "bsf")) {
2025         show_help_bsf(par);
2026     } else {
2027         show_help_default(topic, par);
2028     }
2029 
2030     av_freep(&topic);
2031     return 0;
2032 }
2033 
read_yesno(void)2034 int read_yesno(void)
2035 {
2036     int c = getchar();
2037     int yesno = (av_toupper(c) == 'Y');
2038 
2039     while (c != '\n' && c != EOF)
2040         c = getchar();
2041 
2042     return yesno;
2043 }
2044 
get_preset_file(char * filename,size_t filename_size,const char * preset_name,int is_path,const char * codec_name)2045 FILE *get_preset_file(char *filename, size_t filename_size,
2046                       const char *preset_name, int is_path,
2047                       const char *codec_name)
2048 {
2049     FILE *f = NULL;
2050     int i;
2051     const char *base[3] = { getenv("FFMPEG_DATADIR"),
2052                             getenv("HOME"),
2053                             FFMPEG_DATADIR, };
2054 
2055     if (is_path) {
2056         av_strlcpy(filename, preset_name, filename_size);
2057         f = fopen(filename, "r");
2058     } else {
2059 #if HAVE_GETMODULEHANDLE && defined(_WIN32)
2060         char datadir[MAX_PATH], *ls;
2061         base[2] = NULL;
2062 
2063         if (GetModuleFileNameA(GetModuleHandleA(NULL), datadir, sizeof(datadir) - 1))
2064         {
2065             for (ls = datadir; ls < datadir + strlen(datadir); ls++)
2066                 if (*ls == '\\') *ls = '/';
2067 
2068             if (ls = strrchr(datadir, '/'))
2069             {
2070                 *ls = 0;
2071                 strncat(datadir, "/ffpresets",  sizeof(datadir) - 1 - strlen(datadir));
2072                 base[2] = datadir;
2073             }
2074         }
2075 #endif
2076         for (i = 0; i < 3 && !f; i++) {
2077             if (!base[i])
2078                 continue;
2079             snprintf(filename, filename_size, "%s%s/%s.ffpreset", base[i],
2080                      i != 1 ? "" : "/.ffmpeg", preset_name);
2081             f = fopen(filename, "r");
2082             if (!f && codec_name) {
2083                 snprintf(filename, filename_size,
2084                          "%s%s/%s-%s.ffpreset",
2085                          base[i], i != 1 ? "" : "/.ffmpeg", codec_name,
2086                          preset_name);
2087                 f = fopen(filename, "r");
2088             }
2089         }
2090     }
2091 
2092     return f;
2093 }
2094 
check_stream_specifier(AVFormatContext * s,AVStream * st,const char * spec)2095 int check_stream_specifier(AVFormatContext *s, AVStream *st, const char *spec)
2096 {
2097     int ret = avformat_match_stream_specifier(s, st, spec);
2098     if (ret < 0)
2099         av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
2100     return ret;
2101 }
2102 
filter_codec_opts(AVDictionary * opts,enum AVCodecID codec_id,AVFormatContext * s,AVStream * st,const AVCodec * codec)2103 AVDictionary *filter_codec_opts(AVDictionary *opts, enum AVCodecID codec_id,
2104                                 AVFormatContext *s, AVStream *st, const AVCodec *codec)
2105 {
2106     AVDictionary    *ret = NULL;
2107     AVDictionaryEntry *t = NULL;
2108     int            flags = s->oformat ? AV_OPT_FLAG_ENCODING_PARAM
2109                                       : AV_OPT_FLAG_DECODING_PARAM;
2110     char          prefix = 0;
2111     const AVClass    *cc = avcodec_get_class();
2112 
2113     if (!codec)
2114         codec            = s->oformat ? avcodec_find_encoder(codec_id)
2115                                       : avcodec_find_decoder(codec_id);
2116 
2117     switch (st->codecpar->codec_type) {
2118     case AVMEDIA_TYPE_VIDEO:
2119         prefix  = 'v';
2120         flags  |= AV_OPT_FLAG_VIDEO_PARAM;
2121         break;
2122     case AVMEDIA_TYPE_AUDIO:
2123         prefix  = 'a';
2124         flags  |= AV_OPT_FLAG_AUDIO_PARAM;
2125         break;
2126     case AVMEDIA_TYPE_SUBTITLE:
2127         prefix  = 's';
2128         flags  |= AV_OPT_FLAG_SUBTITLE_PARAM;
2129         break;
2130     }
2131 
2132     while (t = av_dict_get(opts, "", t, AV_DICT_IGNORE_SUFFIX)) {
2133         const AVClass *priv_class;
2134         char *p = strchr(t->key, ':');
2135 
2136         /* check stream specification in opt name */
2137         if (p)
2138             switch (check_stream_specifier(s, st, p + 1)) {
2139             case  1: *p = 0; break;
2140             case  0:         continue;
2141             default:         exit_program(1);
2142             }
2143 
2144         if (av_opt_find(&cc, t->key, NULL, flags, AV_OPT_SEARCH_FAKE_OBJ) ||
2145             !codec ||
2146             ((priv_class = codec->priv_class) &&
2147              av_opt_find(&priv_class, t->key, NULL, flags,
2148                          AV_OPT_SEARCH_FAKE_OBJ)))
2149             av_dict_set(&ret, t->key, t->value, 0);
2150         else if (t->key[0] == prefix &&
2151                  av_opt_find(&cc, t->key + 1, NULL, flags,
2152                              AV_OPT_SEARCH_FAKE_OBJ))
2153             av_dict_set(&ret, t->key + 1, t->value, 0);
2154 
2155         if (p)
2156             *p = ':';
2157     }
2158     return ret;
2159 }
2160 
setup_find_stream_info_opts(AVFormatContext * s,AVDictionary * codec_opts)2161 AVDictionary **setup_find_stream_info_opts(AVFormatContext *s,
2162                                            AVDictionary *codec_opts)
2163 {
2164     int i;
2165     AVDictionary **opts;
2166 
2167     if (!s->nb_streams)
2168         return NULL;
2169     opts = av_mallocz_array(s->nb_streams, sizeof(*opts));
2170     if (!opts) {
2171         av_log(NULL, AV_LOG_ERROR,
2172                "Could not alloc memory for stream options.\n");
2173         return NULL;
2174     }
2175     for (i = 0; i < s->nb_streams; i++)
2176         opts[i] = filter_codec_opts(codec_opts, s->streams[i]->codecpar->codec_id,
2177                                     s, s->streams[i], NULL);
2178     return opts;
2179 }
2180 
grow_array(void * array,int elem_size,int * size,int new_size)2181 void *grow_array(void *array, int elem_size, int *size, int new_size)
2182 {
2183     if (new_size >= INT_MAX / elem_size) {
2184         av_log(NULL, AV_LOG_ERROR, "Array too big.\n");
2185         exit_program(1);
2186     }
2187     if (*size < new_size) {
2188         uint8_t *tmp = av_realloc_array(array, new_size, elem_size);
2189         if (!tmp) {
2190             av_log(NULL, AV_LOG_ERROR, "Could not alloc buffer.\n");
2191             exit_program(1);
2192         }
2193         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
2194         *size = new_size;
2195         return tmp;
2196     }
2197     return array;
2198 }
2199 
get_rotation(AVStream * st)2200 double get_rotation(AVStream *st)
2201 {
2202     uint8_t* displaymatrix = av_stream_get_side_data(st,
2203                                                      AV_PKT_DATA_DISPLAYMATRIX, NULL);
2204     double theta = 0;
2205     if (displaymatrix)
2206         theta = -av_display_rotation_get((int32_t*) displaymatrix);
2207 
2208     theta -= 360*floor(theta/360 + 0.9/360);
2209 
2210     if (fabs(theta - 90*round(theta/90)) > 2)
2211         av_log(NULL, AV_LOG_WARNING, "Odd rotation angle.\n"
2212                "If you want to help, upload a sample "
2213                "of this file to https://streams.videolan.org/upload/ "
2214                "and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)");
2215 
2216     return theta;
2217 }
2218 
2219 #if CONFIG_AVDEVICE
print_device_sources(AVInputFormat * fmt,AVDictionary * opts)2220 static int print_device_sources(AVInputFormat *fmt, AVDictionary *opts)
2221 {
2222     int ret, i;
2223     AVDeviceInfoList *device_list = NULL;
2224 
2225     if (!fmt || !fmt->priv_class  || !AV_IS_INPUT_DEVICE(fmt->priv_class->category))
2226         return AVERROR(EINVAL);
2227 
2228     printf("Auto-detected sources for %s:\n", fmt->name);
2229     if (!fmt->get_device_list) {
2230         ret = AVERROR(ENOSYS);
2231         printf("Cannot list sources. Not implemented.\n");
2232         goto fail;
2233     }
2234 
2235     if ((ret = avdevice_list_input_sources(fmt, NULL, opts, &device_list)) < 0) {
2236         printf("Cannot list sources.\n");
2237         goto fail;
2238     }
2239 
2240     for (i = 0; i < device_list->nb_devices; i++) {
2241         printf("%s %s [%s]\n", device_list->default_device == i ? "*" : " ",
2242                device_list->devices[i]->device_name, device_list->devices[i]->device_description);
2243     }
2244 
2245   fail:
2246     avdevice_free_list_devices(&device_list);
2247     return ret;
2248 }
2249 
print_device_sinks(AVOutputFormat * fmt,AVDictionary * opts)2250 static int print_device_sinks(AVOutputFormat *fmt, AVDictionary *opts)
2251 {
2252     int ret, i;
2253     AVDeviceInfoList *device_list = NULL;
2254 
2255     if (!fmt || !fmt->priv_class  || !AV_IS_OUTPUT_DEVICE(fmt->priv_class->category))
2256         return AVERROR(EINVAL);
2257 
2258     printf("Auto-detected sinks for %s:\n", fmt->name);
2259     if (!fmt->get_device_list) {
2260         ret = AVERROR(ENOSYS);
2261         printf("Cannot list sinks. Not implemented.\n");
2262         goto fail;
2263     }
2264 
2265     if ((ret = avdevice_list_output_sinks(fmt, NULL, opts, &device_list)) < 0) {
2266         printf("Cannot list sinks.\n");
2267         goto fail;
2268     }
2269 
2270     for (i = 0; i < device_list->nb_devices; i++) {
2271         printf("%s %s [%s]\n", device_list->default_device == i ? "*" : " ",
2272                device_list->devices[i]->device_name, device_list->devices[i]->device_description);
2273     }
2274 
2275   fail:
2276     avdevice_free_list_devices(&device_list);
2277     return ret;
2278 }
2279 
show_sinks_sources_parse_arg(const char * arg,char ** dev,AVDictionary ** opts)2280 static int show_sinks_sources_parse_arg(const char *arg, char **dev, AVDictionary **opts)
2281 {
2282     int ret;
2283     if (arg) {
2284         char *opts_str = NULL;
2285         av_assert0(dev && opts);
2286         *dev = av_strdup(arg);
2287         if (!*dev)
2288             return AVERROR(ENOMEM);
2289         if ((opts_str = strchr(*dev, ','))) {
2290             *(opts_str++) = '\0';
2291             if (opts_str[0] && ((ret = av_dict_parse_string(opts, opts_str, "=", ":", 0)) < 0)) {
2292                 av_freep(dev);
2293                 return ret;
2294             }
2295         }
2296     } else
2297         printf("\nDevice name is not provided.\n"
2298                 "You can pass devicename[,opt1=val1[,opt2=val2...]] as an argument.\n\n");
2299     return 0;
2300 }
2301 
show_sources(void * optctx,const char * opt,const char * arg)2302 int show_sources(void *optctx, const char *opt, const char *arg)
2303 {
2304     AVInputFormat *fmt = NULL;
2305     char *dev = NULL;
2306     AVDictionary *opts = NULL;
2307     int ret = 0;
2308     int error_level = av_log_get_level();
2309 
2310     av_log_set_level(AV_LOG_WARNING);
2311 
2312     if ((ret = show_sinks_sources_parse_arg(arg, &dev, &opts)) < 0)
2313         goto fail;
2314 
2315     do {
2316         fmt = av_input_audio_device_next(fmt);
2317         if (fmt) {
2318             if (!strcmp(fmt->name, "lavfi"))
2319                 continue; //it's pointless to probe lavfi
2320             if (dev && !av_match_name(dev, fmt->name))
2321                 continue;
2322             print_device_sources(fmt, opts);
2323         }
2324     } while (fmt);
2325     do {
2326         fmt = av_input_video_device_next(fmt);
2327         if (fmt) {
2328             if (dev && !av_match_name(dev, fmt->name))
2329                 continue;
2330             print_device_sources(fmt, opts);
2331         }
2332     } while (fmt);
2333   fail:
2334     av_dict_free(&opts);
2335     av_free(dev);
2336     av_log_set_level(error_level);
2337     return ret;
2338 }
2339 
show_sinks(void * optctx,const char * opt,const char * arg)2340 int show_sinks(void *optctx, const char *opt, const char *arg)
2341 {
2342     AVOutputFormat *fmt = NULL;
2343     char *dev = NULL;
2344     AVDictionary *opts = NULL;
2345     int ret = 0;
2346     int error_level = av_log_get_level();
2347 
2348     av_log_set_level(AV_LOG_WARNING);
2349 
2350     if ((ret = show_sinks_sources_parse_arg(arg, &dev, &opts)) < 0)
2351         goto fail;
2352 
2353     do {
2354         fmt = av_output_audio_device_next(fmt);
2355         if (fmt) {
2356             if (dev && !av_match_name(dev, fmt->name))
2357                 continue;
2358             print_device_sinks(fmt, opts);
2359         }
2360     } while (fmt);
2361     do {
2362         fmt = av_output_video_device_next(fmt);
2363         if (fmt) {
2364             if (dev && !av_match_name(dev, fmt->name))
2365                 continue;
2366             print_device_sinks(fmt, opts);
2367         }
2368     } while (fmt);
2369   fail:
2370     av_dict_free(&opts);
2371     av_free(dev);
2372     av_log_set_level(error_level);
2373     return ret;
2374 }
2375 
2376 #endif
2377