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FFmpeg/libavutil/opt.c

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  1. /*

  2.  * AVOptions

  3.  * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * AVOptions

  25.  * @author Michael Niedermayer <michaelni@gmx.at>

  26.  */

  27. 

  28. #include "avutil.h"

  29. #include "avstring.h"

  30. #include "common.h"

  31. #include "opt.h"

  32. #include "eval.h"

  33. #include "dict.h"

  34. #include "log.h"

  35. #include "mathematics.h"

  36. 

  37. const AVOption *av_opt_next(void *obj, const AVOption *last)

  38. {

  39.     AVClass *class = *(AVClass**)obj;

  40.     if (!last && class->option && class->option[0].name)

  41.         return class->option;

  42.     if (last && last[1].name)

  43.         return ++last;

  44.     return NULL;

  45. }

  46. 

  47. static int read_number(const AVOption *o, void *dst, double *num, int *den, int64_t *intnum)

  48. {

  49.     switch (o->type) {

  50.     case AV_OPT_TYPE_FLAGS:     *intnum = *(unsigned int*)dst;return 0;

  51.     case AV_OPT_TYPE_INT:       *intnum = *(int         *)dst;return 0;

  52.     case AV_OPT_TYPE_INT64:     *intnum = *(int64_t     *)dst;return 0;

  53.     case AV_OPT_TYPE_FLOAT:     *num    = *(float       *)dst;return 0;

  54.     case AV_OPT_TYPE_DOUBLE:    *num    = *(double      *)dst;return 0;

  55.     case AV_OPT_TYPE_RATIONAL:  *intnum = ((AVRational*)dst)->num;

  56.                                 *den    = ((AVRational*)dst)->den;

  57.                                                         return 0;

  58.     }

  59.     return AVERROR(EINVAL);

  60. }

  61. 

  62. static int write_number(void *obj, const AVOption *o, void *dst, double num, int den, int64_t intnum)

  63. {

  64.     if (o->type != AV_OPT_TYPE_FLAGS &&

  65.         (o->max * den < num * intnum || o->min * den > num * intnum)) {

  66.         av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range\n",

  67.                num*intnum/den, o->name);

  68.         return AVERROR(ERANGE);

  69.     }

  70. 

  71.     switch (o->type) {

  72.     case AV_OPT_TYPE_FLAGS:

  73.     case AV_OPT_TYPE_INT:   *(int       *)dst= llrint(num/den)*intnum; break;

  74.     case AV_OPT_TYPE_INT64: *(int64_t   *)dst= llrint(num/den)*intnum; break;

  75.     case AV_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;

  76.     case AV_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;

  77.     case AV_OPT_TYPE_RATIONAL:

  78.         if ((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};

  79.         else                 *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);

  80.         break;

  81.     default:

  82.         return AVERROR(EINVAL);

  83.     }

  84.     return 0;

  85. }

  86. 

  87. static const double const_values[] = {

  88.     M_PI,

  89.     M_E,

  90.     FF_QP2LAMBDA,

  91.     0

  92. };

  93. 

  94. static const char * const const_names[] = {

  95.     "PI",

  96.     "E",

  97.     "QP2LAMBDA",

  98.     0

  99. };

  100. 

  101. static int hexchar2int(char c) {

  102.     if (c >= '0' && c <= '9') return c - '0';

  103.     if (c >= 'a' && c <= 'f') return c - 'a' + 10;

  104.     if (c >= 'A' && c <= 'F') return c - 'A' + 10;

  105.     return -1;

  106. }

  107. 

  108. static int set_string_binary(void *obj, const AVOption *o, const char *val, uint8_t **dst)

  109. {

  110.     int *lendst = (int *)(dst + 1);

  111.     uint8_t *bin, *ptr;

  112.     int len = strlen(val);

  113. 

  114.     av_freep(dst);

  115.     *lendst = 0;

  116. 

  117.     if (len & 1)

  118.         return AVERROR(EINVAL);

  119.     len /= 2;

  120. 

  121.     ptr = bin = av_malloc(len);

  122.     while (*val) {

  123.         int a = hexchar2int(*val++);

  124.         int b = hexchar2int(*val++);

  125.         if (a < 0 || b < 0) {

  126.             av_free(bin);

  127.             return AVERROR(EINVAL);

  128.         }

  129.         *ptr++ = (a << 4) | b;

  130.     }

  131.     *dst = bin;

  132.     *lendst = len;

  133. 

  134.     return 0;

  135. }

  136. 

  137. static int set_string(void *obj, const AVOption *o, const char *val, uint8_t **dst)

  138. {

  139.     av_freep(dst);

  140.     *dst = av_strdup(val);

  141.     return 0;

  142. }

  143. 

  144. #define DEFAULT_NUMVAL(opt) ((opt->type == AV_OPT_TYPE_INT64 || \

  145.                               opt->type == AV_OPT_TYPE_CONST || \

  146.                               opt->type == AV_OPT_TYPE_FLAGS || \

  147.                               opt->type == AV_OPT_TYPE_INT) ? \

  148.                              opt->default_val.i64 : opt->default_val.dbl)

  149. 

  150. static int set_string_number(void *obj, void *target_obj, const AVOption *o, const char *val, void *dst)

  151. {

  152.     int ret = 0, notfirst = 0;

  153.     for (;;) {

  154.         int i, den = 1;

  155.         char buf[256];

  156.         int cmd = 0;

  157.         double d, num = 1;

  158.         int64_t intnum = 1;

  159. 

  160.         i = 0;

  161.         if (*val == '+' || *val == '-') {

  162.             if (o->type == AV_OPT_TYPE_FLAGS)

  163.                 cmd = *(val++);

  164.             else if (!notfirst)

  165.                 buf[i++] = *val;

  166.         }

  167. 

  168.         for (; i < sizeof(buf) - 1 && val[i] && val[i] != '+' && val[i] != '-'; i++)

  169.             buf[i] = val[i];

  170.         buf[i] = 0;

  171. 

  172.         {

  173.             const AVOption *o_named = av_opt_find(target_obj, buf, o->unit, 0, 0);

  174.             if (o_named && o_named->type == AV_OPT_TYPE_CONST)

  175.                 d = DEFAULT_NUMVAL(o_named);

  176.             else if (!strcmp(buf, "default")) d = DEFAULT_NUMVAL(o);

  177.             else if (!strcmp(buf, "max"    )) d = o->max;

  178.             else if (!strcmp(buf, "min"    )) d = o->min;

  179.             else if (!strcmp(buf, "none"   )) d = 0;

  180.             else if (!strcmp(buf, "all"    )) d = ~0;

  181.             else {

  182.                 int res = av_expr_parse_and_eval(&d, buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);

  183.                 if (res < 0) {

  184.                     av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);

  185.                     return res;

  186.                 }

  187.             }

  188.         }

  189.         if (o->type == AV_OPT_TYPE_FLAGS) {

  190.             read_number(o, dst, NULL, NULL, &intnum);

  191.             if      (cmd == '+') d = intnum | (int64_t)d;

  192.             else if (cmd == '-') d = intnum &~(int64_t)d;

  193.         } else {

  194.             read_number(o, dst, &num, &den, &intnum);

  195.             if      (cmd == '+') d = notfirst*num*intnum/den + d;

  196.             else if (cmd == '-') d = notfirst*num*intnum/den - d;

  197.         }

  198. 

  199.         if ((ret = write_number(obj, o, dst, d, 1, 1)) < 0)

  200.             return ret;

  201.         val += i;

  202.         if (!*val)

  203.             return 0;

  204.         notfirst = 1;

  205.     }

  206. 

  207.     return 0;

  208. }

  209. 

  210. int av_opt_set(void *obj, const char *name, const char *val, int search_flags)

  211. {

  212.     void *dst, *target_obj;

  213.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  214.     if (!o || !target_obj)

  215.         return AVERROR_OPTION_NOT_FOUND;

  216.     if (!val || o->flags & AV_OPT_FLAG_READONLY)

  217.         return AVERROR(EINVAL);

  218. 

  219.     dst = ((uint8_t*)target_obj) + o->offset;

  220.     switch (o->type) {

  221.     case AV_OPT_TYPE_STRING:   return set_string(obj, o, val, dst);

  222.     case AV_OPT_TYPE_BINARY:   return set_string_binary(obj, o, val, dst);

  223.     case AV_OPT_TYPE_FLAGS:

  224.     case AV_OPT_TYPE_INT:

  225.     case AV_OPT_TYPE_INT64:

  226.     case AV_OPT_TYPE_FLOAT:

  227.     case AV_OPT_TYPE_DOUBLE:

  228.     case AV_OPT_TYPE_RATIONAL: return set_string_number(obj, target_obj, o, val, dst);

  229.     }

  230. 

  231.     av_log(obj, AV_LOG_ERROR, "Invalid option type.\n");

  232.     return AVERROR(EINVAL);

  233. }

  234. 

  235. #define OPT_EVAL_NUMBER(name, opttype, vartype)\

  236.     int av_opt_eval_ ## name(void *obj, const AVOption *o, const char *val, vartype *name ## _out)\

  237.     {\

  238.         if (!o || o->type != opttype || o->flags & AV_OPT_FLAG_READONLY)\

  239.             return AVERROR(EINVAL);\

  240.         return set_string_number(obj, obj, o, val, name ## _out);\

  241.     }

  242. 

  243. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  244. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  245. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  246. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  247. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  248. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  249. 

  250. static int set_number(void *obj, const char *name, double num, int den, int64_t intnum,

  251.                                   int search_flags)

  252. {

  253.     void *dst, *target_obj;

  254.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  255. 

  256.     if (!o || !target_obj)

  257.         return AVERROR_OPTION_NOT_FOUND;

  258. 

  259.     if (o->flags & AV_OPT_FLAG_READONLY)

  260.         return AVERROR(EINVAL);

  261. 

  262.     dst = ((uint8_t*)target_obj) + o->offset;

  263.     return write_number(obj, o, dst, num, den, intnum);

  264. }

  265. 

  266. int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)

  267. {

  268.     return set_number(obj, name, 1, 1, val, search_flags);

  269. }

  270. 

  271. int av_opt_set_double(void *obj, const char *name, double val, int search_flags)

  272. {

  273.     return set_number(obj, name, val, 1, 1, search_flags);

  274. }

  275. 

  276. int av_opt_set_q(void *obj, const char *name, AVRational val, int search_flags)

  277. {

  278.     return set_number(obj, name, val.num, val.den, 1, search_flags);

  279. }

  280. 

  281. int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)

  282. {

  283.     void *target_obj;

  284.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  285.     uint8_t *ptr;

  286.     uint8_t **dst;

  287.     int *lendst;

  288. 

  289.     if (!o || !target_obj)

  290.         return AVERROR_OPTION_NOT_FOUND;

  291. 

  292.     if (o->type != AV_OPT_TYPE_BINARY || o->flags & AV_OPT_FLAG_READONLY)

  293.         return AVERROR(EINVAL);

  294. 

  295.     ptr = av_malloc(len);

  296.     if (!ptr)

  297.         return AVERROR(ENOMEM);

  298. 

  299.     dst = (uint8_t **)(((uint8_t *)target_obj) + o->offset);

  300.     lendst = (int *)(dst + 1);

  301. 

  302.     av_free(*dst);

  303.     *dst = ptr;

  304.     *lendst = len;

  305.     memcpy(ptr, val, len);

  306. 

  307.     return 0;

  308. }

  309. 

  310. int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val, int search_flags)

  311. {

  312.     void *target_obj;

  313.     AVDictionary **dst;

  314.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  315. 

  316.     if (!o || !target_obj)

  317.         return AVERROR_OPTION_NOT_FOUND;

  318.     if (o->flags & AV_OPT_FLAG_READONLY)

  319.         return AVERROR(EINVAL);

  320. 

  321.     dst = (AVDictionary **)(((uint8_t *)target_obj) + o->offset);

  322.     av_dict_free(dst);

  323.     av_dict_copy(dst, val, 0);

  324. 

  325.     return 0;

  326. }

  327. 

  328. int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)

  329. {

  330.     void *dst, *target_obj;

  331.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  332.     uint8_t *bin, buf[128];

  333.     int len, i, ret;

  334. 

  335.     if (!o || !target_obj)

  336.         return AVERROR_OPTION_NOT_FOUND;

  337. 

  338.     dst = (uint8_t*)target_obj + o->offset;

  339. 

  340.     buf[0] = 0;

  341.     switch (o->type) {

  342.     case AV_OPT_TYPE_FLAGS:     ret = snprintf(buf, sizeof(buf), "0x%08X",  *(int    *)dst);break;

  343.     case AV_OPT_TYPE_INT:       ret = snprintf(buf, sizeof(buf), "%d" ,     *(int    *)dst);break;

  344.     case AV_OPT_TYPE_INT64:     ret = snprintf(buf, sizeof(buf), "%"PRId64, *(int64_t*)dst);break;

  345.     case AV_OPT_TYPE_FLOAT:     ret = snprintf(buf, sizeof(buf), "%f" ,     *(float  *)dst);break;

  346.     case AV_OPT_TYPE_DOUBLE:    ret = snprintf(buf, sizeof(buf), "%f" ,     *(double *)dst);break;

  347.     case AV_OPT_TYPE_RATIONAL:  ret = snprintf(buf, sizeof(buf), "%d/%d",   ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;

  348.     case AV_OPT_TYPE_STRING:

  349.         if (*(uint8_t**)dst)

  350.             *out_val = av_strdup(*(uint8_t**)dst);

  351.         else

  352.             *out_val = av_strdup("");

  353.         return 0;

  354.     case AV_OPT_TYPE_BINARY:

  355.         len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));

  356.         if ((uint64_t)len*2 + 1 > INT_MAX)

  357.             return AVERROR(EINVAL);

  358.         if (!(*out_val = av_malloc(len*2 + 1)))

  359.             return AVERROR(ENOMEM);

  360.         bin = *(uint8_t**)dst;

  361.         for (i = 0; i < len; i++)

  362.             snprintf(*out_val + i*2, 3, "%02X", bin[i]);

  363.         return 0;

  364.     default:

  365.         return AVERROR(EINVAL);

  366.     }

  367. 

  368.     if (ret >= sizeof(buf))

  369.         return AVERROR(EINVAL);

  370.     *out_val = av_strdup(buf);

  371.     return 0;

  372. }

  373. 

  374. static int get_number(void *obj, const char *name, double *num, int *den, int64_t *intnum,

  375.                       int search_flags)

  376. {

  377.     void *dst, *target_obj;

  378.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  379.     if (!o || !target_obj)

  380.         goto error;

  381. 

  382.     dst = ((uint8_t*)target_obj) + o->offset;

  383. 

  384.     return read_number(o, dst, num, den, intnum);

  385. 

  386. error:

  387.     *den=*intnum=0;

  388.     return -1;

  389. }

  390. 

  391. int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)

  392. {

  393.     int64_t intnum = 1;

  394.     double     num = 1;

  395.     int   ret, den = 1;

  396. 

  397.     if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)

  398.         return ret;

  399.     *out_val = num*intnum/den;

  400.     return 0;

  401. }

  402. 

  403. int av_opt_get_double(void *obj, const char *name, int search_flags, double *out_val)

  404. {

  405.     int64_t intnum = 1;

  406.     double     num = 1;

  407.     int   ret, den = 1;

  408. 

  409.     if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)

  410.         return ret;

  411.     *out_val = num*intnum/den;

  412.     return 0;

  413. }

  414. 

  415. int av_opt_get_q(void *obj, const char *name, int search_flags, AVRational *out_val)

  416. {

  417.     int64_t intnum = 1;

  418.     double     num = 1;

  419.     int   ret, den = 1;

  420. 

  421.     if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)

  422.         return ret;

  423. 

  424.     if (num == 1.0 && (int)intnum == intnum)

  425.         *out_val = (AVRational){intnum, den};

  426.     else

  427.         *out_val = av_d2q(num*intnum/den, 1<<24);

  428.     return 0;

  429. }

  430. 

  431. int av_opt_get_dict_val(void *obj, const char *name, int search_flags, AVDictionary **out_val)

  432. {

  433.     void *target_obj;

  434.     AVDictionary *src;

  435.     const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);

  436. 

  437.     if (!o || !target_obj)

  438.         return AVERROR_OPTION_NOT_FOUND;

  439.     if (o->type != AV_OPT_TYPE_DICT)

  440.         return AVERROR(EINVAL);

  441. 

  442.     src = *(AVDictionary **)(((uint8_t *)target_obj) + o->offset);

  443.     av_dict_copy(out_val, src, 0);

  444. 

  445.     return 0;

  446. }

  447. 

  448. int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)

  449. {

  450.     const AVOption *field = av_opt_find(obj, field_name, NULL, 0, 0);

  451.     const AVOption *flag  = av_opt_find(obj, flag_name,

  452.                                         field ? field->unit : NULL, 0, 0);

  453.     int64_t res;

  454. 

  455.     if (!field || !flag || flag->type != AV_OPT_TYPE_CONST ||

  456.         av_opt_get_int(obj, field_name, 0, &res) < 0)

  457.         return 0;

  458.     return res & flag->default_val.i64;

  459. }

  460. 

  461. static void opt_list(void *obj, void *av_log_obj, const char *unit,

  462.                      int req_flags, int rej_flags)

  463. {

  464.     const AVOption *opt=NULL;

  465. 

  466.     while ((opt = av_opt_next(obj, opt))) {

  467.         if (!(opt->flags & req_flags) || (opt->flags & rej_flags))

  468.             continue;

  469. 

  470.         /* Don't print CONST's on level one.

  471.          * Don't print anything but CONST's on level two.

  472.          * Only print items from the requested unit.

  473.          */

  474.         if (!unit && opt->type==AV_OPT_TYPE_CONST)

  475.             continue;

  476.         else if (unit && opt->type!=AV_OPT_TYPE_CONST)

  477.             continue;

  478.         else if (unit && opt->type==AV_OPT_TYPE_CONST && strcmp(unit, opt->unit))

  479.             continue;

  480.         else if (unit && opt->type == AV_OPT_TYPE_CONST)

  481.             av_log(av_log_obj, AV_LOG_INFO, "   %-15s ", opt->name);

  482.         else

  483.             av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);

  484. 

  485.         switch (opt->type) {

  486.             case AV_OPT_TYPE_FLAGS:

  487.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>");

  488.                 break;

  489.             case AV_OPT_TYPE_INT:

  490.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int>");

  491.                 break;

  492.             case AV_OPT_TYPE_INT64:

  493.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>");

  494.                 break;

  495.             case AV_OPT_TYPE_DOUBLE:

  496.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<double>");

  497.                 break;

  498.             case AV_OPT_TYPE_FLOAT:

  499.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<float>");

  500.                 break;

  501.             case AV_OPT_TYPE_STRING:

  502.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<string>");

  503.                 break;

  504.             case AV_OPT_TYPE_RATIONAL:

  505.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>");

  506.                 break;

  507.             case AV_OPT_TYPE_BINARY:

  508.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>");

  509.                 break;

  510.             case AV_OPT_TYPE_CONST:

  511.             default:

  512.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "");

  513.                 break;

  514.         }

  515.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');

  516.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');

  517.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM   ) ? 'V' : '.');

  518.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM   ) ? 'A' : '.');

  519.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');

  520.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_EXPORT)         ? 'X' : '.');

  521.         av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_READONLY)       ? 'R' : '.');

  522. 

  523.         if (opt->help)

  524.             av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);

  525.         av_log(av_log_obj, AV_LOG_INFO, "\n");

  526.         if (opt->unit && opt->type != AV_OPT_TYPE_CONST) {

  527.             opt_list(obj, av_log_obj, opt->unit, req_flags, rej_flags);

  528.         }

  529.     }

  530. }

  531. 

  532. int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)

  533. {

  534.     if (!obj)

  535.         return -1;

  536. 

  537.     av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);

  538. 

  539.     opt_list(obj, av_log_obj, NULL, req_flags, rej_flags);

  540. 

  541.     return 0;

  542. }

  543. 

  544. void av_opt_set_defaults(void *s)

  545. {

  546.     const AVOption *opt = NULL;

  547.     while ((opt = av_opt_next(s, opt))) {

  548.         if (opt->flags & AV_OPT_FLAG_READONLY)

  549.             continue;

  550. 

  551.         switch (opt->type) {

  552.             case AV_OPT_TYPE_CONST:

  553.                 /* Nothing to be done here */

  554.             break;

  555.             case AV_OPT_TYPE_FLAGS:

  556.             case AV_OPT_TYPE_INT:

  557.             case AV_OPT_TYPE_INT64:

  558.                 av_opt_set_int(s, opt->name, opt->default_val.i64, 0);

  559.             break;

  560.             case AV_OPT_TYPE_DOUBLE:

  561.             case AV_OPT_TYPE_FLOAT: {

  562.                 double val;

  563.                 val = opt->default_val.dbl;

  564.                 av_opt_set_double(s, opt->name, val, 0);

  565.             }

  566.             break;

  567.             case AV_OPT_TYPE_RATIONAL: {

  568.                 AVRational val;

  569.                 val = av_d2q(opt->default_val.dbl, INT_MAX);

  570.                 av_opt_set_q(s, opt->name, val, 0);

  571.             }

  572.             break;

  573.             case AV_OPT_TYPE_STRING:

  574.                 av_opt_set(s, opt->name, opt->default_val.str, 0);

  575.                 break;

  576.             case AV_OPT_TYPE_BINARY:

  577.             case AV_OPT_TYPE_DICT:

  578.                 /* Cannot set defaults for these types */

  579.             break;

  580.             default:

  581.                 av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);

  582.         }

  583.     }

  584. }

  585. 

  586. /**

  587.  * Store the value in the field in ctx that is named like key.

  588.  * ctx must be an AVClass context, storing is done using AVOptions.

  589.  *

  590.  * @param buf the string to parse, buf will be updated to point at the

  591.  * separator just after the parsed key/value pair

  592.  * @param key_val_sep a 0-terminated list of characters used to

  593.  * separate key from value

  594.  * @param pairs_sep a 0-terminated list of characters used to separate

  595.  * two pairs from each other

  596.  * @return 0 if the key/value pair has been successfully parsed and

  597.  * set, or a negative value corresponding to an AVERROR code in case

  598.  * of error:

  599.  * AVERROR(EINVAL) if the key/value pair cannot be parsed,

  600.  * the error code issued by av_opt_set() if the key/value pair

  601.  * cannot be set

  602.  */

  603. static int parse_key_value_pair(void *ctx, const char **buf,

  604.                                 const char *key_val_sep, const char *pairs_sep)

  605. {

  606.     char *key = av_get_token(buf, key_val_sep);

  607.     char *val;

  608.     int ret;

  609. 

  610.     if (!key)

  611.         return AVERROR(ENOMEM);

  612. 

  613.     if (*key && strspn(*buf, key_val_sep)) {

  614.         (*buf)++;

  615.         val = av_get_token(buf, pairs_sep);

  616.         if (!val) {

  617.             av_freep(&key);

  618.             return AVERROR(ENOMEM);

  619.         }

  620.     } else {

  621.         av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);

  622.         av_free(key);

  623.         return AVERROR(EINVAL);

  624.     }

  625. 

  626.     av_log(ctx, AV_LOG_DEBUG, "Setting value '%s' for key '%s'\n", val, key);

  627. 

  628.     ret = av_opt_set(ctx, key, val, AV_OPT_SEARCH_CHILDREN);

  629.     if (ret == AVERROR_OPTION_NOT_FOUND)

  630.         av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);

  631. 

  632.     av_free(key);

  633.     av_free(val);

  634.     return ret;

  635. }

  636. 

  637. int av_set_options_string(void *ctx, const char *opts,

  638.                           const char *key_val_sep, const char *pairs_sep)

  639. {

  640.     int ret, count = 0;

  641. 

  642.     if (!opts)

  643.         return 0;

  644. 

  645.     while (*opts) {

  646.         if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)

  647.             return ret;

  648.         count++;

  649. 

  650.         if (*opts)

  651.             opts++;

  652.     }

  653. 

  654.     return count;

  655. }

  656. 

  657. void av_opt_free(void *obj)

  658. {

  659.     const AVOption *o = NULL;

  660.     while ((o = av_opt_next(obj, o))) {

  661.         switch (o->type) {

  662.         case AV_OPT_TYPE_STRING:

  663.         case AV_OPT_TYPE_BINARY:

  664.             av_freep((uint8_t *)obj + o->offset);

  665.             break;

  666. 

  667.         case AV_OPT_TYPE_DICT:

  668.             av_dict_free((AVDictionary **)(((uint8_t *)obj) + o->offset));

  669.             break;

  670. 

  671.         default:

  672.             break;

  673.         }

  674.     }

  675. }

  676. 

  677. int av_opt_set_dict(void *obj, AVDictionary **options)

  678. {

  679.     AVDictionaryEntry *t = NULL;

  680.     AVDictionary    *tmp = NULL;

  681.     int ret = 0;

  682. 

  683.     while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {

  684.         ret = av_opt_set(obj, t->key, t->value, 0);

  685.         if (ret == AVERROR_OPTION_NOT_FOUND)

  686.             av_dict_set(&tmp, t->key, t->value, 0);

  687.         else if (ret < 0) {

  688.             av_log(obj, AV_LOG_ERROR, "Error setting option %s to value %s.\n", t->key, t->value);

  689.             break;

  690.         }

  691.         ret = 0;

  692.     }

  693.     av_dict_free(options);

  694.     *options = tmp;

  695.     return ret;

  696. }

  697. 

  698. const AVOption *av_opt_find(void *obj, const char *name, const char *unit,

  699.                             int opt_flags, int search_flags)

  700. {

  701.     return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);

  702. }

  703. 

  704. const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,

  705.                              int opt_flags, int search_flags, void **target_obj)

  706. {

  707.     const AVClass  *c = *(AVClass**)obj;

  708.     const AVOption *o = NULL;

  709. 

  710.     if (!c)

  711.         return NULL;

  712. 

  713.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  714.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  715.             const AVClass *child = NULL;

  716.             while (child = av_opt_child_class_next(c, child))

  717.                 if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))

  718.                     return o;

  719.         } else {

  720.             void *child = NULL;

  721.             while (child = av_opt_child_next(obj, child))

  722.                 if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))

  723.                     return o;

  724.         }

  725.     }

  726. 

  727.     while (o = av_opt_next(obj, o)) {

  728.         if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&

  729.             ((!unit && o->type != AV_OPT_TYPE_CONST) ||

  730.              (unit  && o->unit && !strcmp(o->unit, unit)))) {

  731.             if (target_obj) {

  732.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  733.                     *target_obj = obj;

  734.                 else

  735.                     *target_obj = NULL;

  736.             }

  737.             return o;

  738.         }

  739.     }

  740.     return NULL;

  741. }

  742. 

  743. void *av_opt_child_next(void *obj, void *prev)

  744. {

  745.     const AVClass *c = *(AVClass**)obj;

  746.     if (c->child_next)

  747.         return c->child_next(obj, prev);

  748.     return NULL;

  749. }

  750. 

  751. const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)

  752. {

  753.     if (parent->child_class_next)

  754.         return parent->child_class_next(prev);

  755.     return NULL;

  756. }

  757. 

  758. #ifdef TEST

  759. 

  760. typedef struct TestContext

  761. {

  762.     const AVClass *class;

  763.     int num;

  764.     int toggle;

  765.     char *string;

  766.     int flags;

  767.     AVRational rational;

  768. } TestContext;

  769. 

  770. #define OFFSET(x) offsetof(TestContext, x)

  771. 

  772. #define TEST_FLAG_COOL 01

  773. #define TEST_FLAG_LAME 02

  774. #define TEST_FLAG_MU   04

  775. 

  776. static const AVOption test_options[]= {

  777. {"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {.i64 = 0},       0,        100                 },

  778. {"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {.i64 = 0},       0,        1                   },

  779. {"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {.dbl = 0},  0,        10                  },

  780. {"string",   "set string",     OFFSET(string),   AV_OPT_TYPE_STRING,   {0},              CHAR_MIN, CHAR_MAX            },

  781. {"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {.i64 = 0},       0,        INT_MAX, 0, "flags" },

  782. {"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },

  783. {"lame",     "set lame flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },

  784. {"mu",       "set mu flag ",   0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },

  785. {NULL},

  786. };

  787. 

  788. static const char *test_get_name(void *ctx)

  789. {

  790.     return "test";

  791. }

  792. 

  793. static const AVClass test_class = {

  794.     "TestContext",

  795.     test_get_name,

  796.     test_options

  797. };

  798. 

  799. int main(void)

  800. {

  801.     int i;

  802. 

  803.     printf("\nTesting av_set_options_string()\n");

  804.     {

  805.         TestContext test_ctx;

  806.         const char *options[] = {

  807.             "",

  808.             ":",

  809.             "=",

  810.             "foo=:",

  811.             ":=foo",

  812.             "=foo",

  813.             "foo=",

  814.             "foo",

  815.             "foo=val",

  816.             "foo==val",

  817.             "toggle=:",

  818.             "string=:",

  819.             "toggle=1 : foo",

  820.             "toggle=100",

  821.             "toggle==1",

  822.             "flags=+mu-lame : num=42: toggle=0",

  823.             "num=42 : string=blahblah",

  824.             "rational=0 : rational=1/2 : rational=1/-1",

  825.             "rational=-1/0",

  826.         };

  827. 

  828.         test_ctx.class = &test_class;

  829.         av_opt_set_defaults(&test_ctx);

  830.         test_ctx.string = av_strdup("default");

  831. 

  832.         av_log_set_level(AV_LOG_DEBUG);

  833. 

  834.         for (i=0; i < FF_ARRAY_ELEMS(options); i++) {

  835.             av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);

  836.             if (av_set_options_string(&test_ctx, options[i], "=", ":") < 0)

  837.                 av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);

  838.             printf("\n");

  839.         }

  840.     }

  841. 

  842.     return 0;

  843. }

  844. 

  845. #endif