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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 "avstring.h"

  29. #include "avutil.h"

  30. #include "common.h"

  31. #include "dict.h"

  32. #include "eval.h"

  33. #include "log.h"

  34. #include "mathematics.h"

  35. #include "opt.h"

  36. 

  37. const AVOption *av_opt_next(const 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, const void *dst, double *num, int *den, int64_t *intnum)

  48. {

  49.     switch (o->type) {

  50.     case AV_OPT_TYPE_FLAGS:

  51.         *intnum = *(unsigned int *)dst;

  52.         return 0;

  53.     case AV_OPT_TYPE_INT:

  54.         *intnum = *(int *)dst;

  55.         return 0;

  56.     case AV_OPT_TYPE_INT64:

  57.         *intnum = *(int64_t *)dst;

  58.         return 0;

  59.     case AV_OPT_TYPE_FLOAT:

  60.         *num = *(float *)dst;

  61.         return 0;

  62.     case AV_OPT_TYPE_DOUBLE:

  63.         *num = *(double *)dst;

  64.         return 0;

  65.     case AV_OPT_TYPE_RATIONAL:

  66.         *intnum = ((AVRational *)dst)->num;

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

  68.         return 0;

  69.     }

  70.     return AVERROR(EINVAL);

  71. }

  72. 

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

  74. {

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

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

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

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

  79.         return AVERROR(ERANGE);

  80.     }

  81. 

  82.     switch (o->type) {

  83.     case AV_OPT_TYPE_FLAGS:

  84.     case AV_OPT_TYPE_INT:

  85.         *(int *)dst = llrint(num / den) * intnum;

  86.         break;

  87.     case AV_OPT_TYPE_INT64:

  88.         *(int64_t *)dst = llrint(num / den) * intnum;

  89.         break;

  90.     case AV_OPT_TYPE_FLOAT:

  91.         *(float *)dst = num * intnum / den;

  92.         break;

  93.     case AV_OPT_TYPE_DOUBLE:

  94.         *(double *)dst = num * intnum / den;

  95.         break;

  96.     case AV_OPT_TYPE_RATIONAL:

  97.         if ((int) num == num)

  98.             *(AVRational *)dst = (AVRational) { num *intnum, den };

  99.         else

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

  101.         break;

  102.     default:

  103.         return AVERROR(EINVAL);

  104.     }

  105.     return 0;

  106. }

  107. 

  108. static const double const_values[] = {

  109.     M_PI,

  110.     M_E,

  111.     FF_QP2LAMBDA,

  112.     0

  113. };

  114. 

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

  116.     "PI",

  117.     "E",

  118.     "QP2LAMBDA",

  119.     0

  120. };

  121. 

  122. static int hexchar2int(char c)

  123. {

  124.     if (c >= '0' && c <= '9')

  125.         return c - '0';

  126.     if (c >= 'a' && c <= 'f')

  127.         return c - 'a' + 10;

  128.     if (c >= 'A' && c <= 'F')

  129.         return c - 'A' + 10;

  130.     return -1;

  131. }

  132. 

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

  134. {

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

  136.     uint8_t *bin, *ptr;

  137.     int len = strlen(val);

  138. 

  139.     av_freep(dst);

  140.     *lendst = 0;

  141. 

  142.     if (len & 1)

  143.         return AVERROR(EINVAL);

  144.     len /= 2;

  145. 

  146.     ptr = bin = av_malloc(len);

  147.     if (!ptr)

  148.         return AVERROR(ENOMEM);

  149.     while (*val) {

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

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

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

  153.             av_free(bin);

  154.             return AVERROR(EINVAL);

  155.         }

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

  157.     }

  158.     *dst    = bin;

  159.     *lendst = len;

  160. 

  161.     return 0;

  162. }

  163. 

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

  165. {

  166.     av_freep(dst);

  167.     *dst = av_strdup(val);

  168.     return *dst ? 0 : AVERROR(ENOMEM);

  169. }

  170. 

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

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

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

  174.                               opt->type == AV_OPT_TYPE_INT)     \

  175.                              ? opt->default_val.i64             \

  176.                              : opt->default_val.dbl)

  177. 

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

  179. {

  180.     int ret = 0, notfirst = 0;

  181.     for (;;) {

  182.         int i, den = 1;

  183.         char buf[256];

  184.         int cmd = 0;

  185.         double d, num = 1;

  186.         int64_t intnum = 1;

  187. 

  188.         i = 0;

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

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

  191.                 cmd = *(val++);

  192.             else if (!notfirst)

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

  194.         }

  195. 

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

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

  198.         buf[i] = 0;

  199. 

  200.         {

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

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

  203.                 d = DEFAULT_NUMVAL(o_named);

  204.             else if (!strcmp(buf, "default"))

  205.                 d = DEFAULT_NUMVAL(o);

  206.             else if (!strcmp(buf, "max"))

  207.                 d = o->max;

  208.             else if (!strcmp(buf, "min"))

  209.                 d = o->min;

  210.             else if (!strcmp(buf, "none"))

  211.                 d = 0;

  212.             else if (!strcmp(buf, "all"))

  213.                 d = ~0;

  214.             else {

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

  216.                 if (res < 0) {

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

  218.                     return res;

  219.                 }

  220.             }

  221.         }

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

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

  224.             if (cmd == '+')

  225.                 d = intnum | (int64_t)d;

  226.             else if (cmd == '-')

  227.                 d = intnum & ~(int64_t)d;

  228.         } else {

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

  230.             if (cmd == '+')

  231.                 d = notfirst * num * intnum / den + d;

  232.             else if (cmd == '-')

  233.                 d = notfirst * num * intnum / den - d;

  234.         }

  235. 

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

  237.             return ret;

  238.         val += i;

  239.         if (!*val)

  240.             return 0;

  241.         notfirst = 1;

  242.     }

  243. 

  244.     return 0;

  245. }

  246. 

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

  248. {

  249.     void *dst, *target_obj;

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

  251.     if (!o || !target_obj)

  252.         return AVERROR_OPTION_NOT_FOUND;

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

  254.         return AVERROR(EINVAL);

  255. 

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

  257.     switch (o->type) {

  258.     case AV_OPT_TYPE_STRING:

  259.         return set_string(obj, o, val, dst);

  260.     case AV_OPT_TYPE_BINARY:

  261.         return set_string_binary(obj, o, val, dst);

  262.     case AV_OPT_TYPE_FLAGS:

  263.     case AV_OPT_TYPE_INT:

  264.     case AV_OPT_TYPE_INT64:

  265.     case AV_OPT_TYPE_FLOAT:

  266.     case AV_OPT_TYPE_DOUBLE:

  267.     case AV_OPT_TYPE_RATIONAL:

  268.         return set_string_number(obj, target_obj, o, val, dst);

  269.     }

  270. 

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

  272.     return AVERROR(EINVAL);

  273. }

  274. 

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

  276. int av_opt_eval_ ## name(void *obj, const AVOption *o,                  \

  277.                          const char *val, vartype *name ## _out)        \

  278. {                                                                       \

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

  280.         return AVERROR(EINVAL);                                         \

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

  282. }

  283. 

  284. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  285. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  286. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  287. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  288. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  289. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  290. 

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

  292.                       int search_flags)

  293. {

  294.     void *dst, *target_obj;

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

  296. 

  297.     if (!o || !target_obj)

  298.         return AVERROR_OPTION_NOT_FOUND;

  299. 

  300.     if (o->flags & AV_OPT_FLAG_READONLY)

  301.         return AVERROR(EINVAL);

  302. 

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

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

  305. }

  306. 

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

  308. {

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

  310. }

  311. 

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

  313. {

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

  315. }

  316. 

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

  318. {

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

  320. }

  321. 

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

  323. {

  324.     void *target_obj;

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

  326.     uint8_t *ptr;

  327.     uint8_t **dst;

  328.     int *lendst;

  329. 

  330.     if (!o || !target_obj)

  331.         return AVERROR_OPTION_NOT_FOUND;

  332. 

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

  334.         return AVERROR(EINVAL);

  335. 

  336.     ptr = av_malloc(len);

  337.     if (!ptr)

  338.         return AVERROR(ENOMEM);

  339. 

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

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

  342. 

  343.     av_free(*dst);

  344.     *dst    = ptr;

  345.     *lendst = len;

  346.     memcpy(ptr, val, len);

  347. 

  348.     return 0;

  349. }

  350. 

  351. int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val,

  352.                         int search_flags)

  353. {

  354.     void *target_obj;

  355.     AVDictionary **dst;

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

  357. 

  358.     if (!o || !target_obj)

  359.         return AVERROR_OPTION_NOT_FOUND;

  360.     if (o->flags & AV_OPT_FLAG_READONLY)

  361.         return AVERROR(EINVAL);

  362. 

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

  364.     av_dict_free(dst);

  365.     av_dict_copy(dst, val, 0);

  366. 

  367.     return 0;

  368. }

  369. 

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

  371. {

  372.     void *dst, *target_obj;

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

  374.     uint8_t *bin, buf[128];

  375.     int len, i, ret;

  376. 

  377.     if (!o || !target_obj)

  378.         return AVERROR_OPTION_NOT_FOUND;

  379. 

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

  381. 

  382.     buf[0] = 0;

  383.     switch (o->type) {

  384.     case AV_OPT_TYPE_FLAGS:

  385.         ret = snprintf(buf, sizeof(buf), "0x%08X", *(int *)dst);

  386.         break;

  387.     case AV_OPT_TYPE_INT:

  388.         ret = snprintf(buf, sizeof(buf), "%d", *(int *)dst);

  389.         break;

  390.     case AV_OPT_TYPE_INT64:

  391.         ret = snprintf(buf, sizeof(buf), "%" PRId64, *(int64_t *)dst);

  392.         break;

  393.     case AV_OPT_TYPE_FLOAT:

  394.         ret = snprintf(buf, sizeof(buf), "%f", *(float *)dst);

  395.         break;

  396.     case AV_OPT_TYPE_DOUBLE:

  397.         ret = snprintf(buf, sizeof(buf), "%f", *(double *)dst);

  398.         break;

  399.     case AV_OPT_TYPE_RATIONAL:

  400.         ret = snprintf(buf, sizeof(buf), "%d/%d", ((AVRational *)dst)->num,

  401.                        ((AVRational *)dst)->den);

  402.         break;

  403.     case AV_OPT_TYPE_STRING:

  404.         if (*(uint8_t **)dst)

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

  406.         else

  407.             *out_val = av_strdup("");

  408.         return *out_val ? 0 : AVERROR(ENOMEM);

  409.     case AV_OPT_TYPE_BINARY:

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

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

  412.             return AVERROR(EINVAL);

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

  414.             return AVERROR(ENOMEM);

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

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

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

  418.         return 0;

  419.     default:

  420.         return AVERROR(EINVAL);

  421.     }

  422. 

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

  424.         return AVERROR(EINVAL);

  425.     *out_val = av_strdup(buf);

  426.     return *out_val ? 0 : AVERROR(ENOMEM);

  427. }

  428. 

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

  430.                       int search_flags)

  431. {

  432.     void *dst, *target_obj;

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

  434.     if (!o || !target_obj)

  435.         goto error;

  436. 

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

  438. 

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

  440. 

  441. error:

  442.     *den    =

  443.     *intnum = 0;

  444.     return -1;

  445. }

  446. 

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

  448. {

  449.     int64_t intnum = 1;

  450.     double num = 1;

  451.     int ret, den = 1;

  452. 

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

  454.         return ret;

  455.     *out_val = num * intnum / den;

  456.     return 0;

  457. }

  458. 

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

  460. {

  461.     int64_t intnum = 1;

  462.     double num = 1;

  463.     int ret, den = 1;

  464. 

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

  466.         return ret;

  467.     *out_val = num * intnum / den;

  468.     return 0;

  469. }

  470. 

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

  472. {

  473.     int64_t intnum = 1;

  474.     double num = 1;

  475.     int ret, den = 1;

  476. 

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

  478.         return ret;

  479. 

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

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

  482.     else

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

  484.     return 0;

  485. }

  486. 

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

  488. {

  489.     void *target_obj;

  490.     AVDictionary *src;

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

  492. 

  493.     if (!o || !target_obj)

  494.         return AVERROR_OPTION_NOT_FOUND;

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

  496.         return AVERROR(EINVAL);

  497. 

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

  499.     av_dict_copy(out_val, src, 0);

  500. 

  501.     return 0;

  502. }

  503. 

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

  505. {

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

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

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

  509.     int64_t res;

  510. 

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

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

  513.         return 0;

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

  515. }

  516. 

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

  518.                      int req_flags, int rej_flags)

  519. {

  520.     const AVOption *opt = NULL;

  521. 

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

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

  524.             continue;

  525. 

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

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

  528.          * Only print items from the requested unit.

  529.          */

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

  531.             continue;

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

  533.             continue;

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

  535.             continue;

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

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

  538.         else

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

  540. 

  541.         switch (opt->type) {

  542.         case AV_OPT_TYPE_FLAGS:

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

  544.             break;

  545.         case AV_OPT_TYPE_INT:

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

  547.             break;

  548.         case AV_OPT_TYPE_INT64:

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

  550.             break;

  551.         case AV_OPT_TYPE_DOUBLE:

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

  553.             break;

  554.         case AV_OPT_TYPE_FLOAT:

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

  556.             break;

  557.         case AV_OPT_TYPE_STRING:

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

  559.             break;

  560.         case AV_OPT_TYPE_RATIONAL:

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

  562.             break;

  563.         case AV_OPT_TYPE_BINARY:

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

  565.             break;

  566.         case AV_OPT_TYPE_CONST:

  567.         default:

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

  569.             break;

  570.         }

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

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

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

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

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

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

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

  578. 

  579.         if (opt->help)

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

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

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

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

  584.     }

  585. }

  586. 

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

  588. {

  589.     if (!obj)

  590.         return -1;

  591. 

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

  593. 

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

  595. 

  596.     return 0;

  597. }

  598. 

  599. void av_opt_set_defaults(void *s)

  600. {

  601.     const AVOption *opt = NULL;

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

  603.         if (opt->flags & AV_OPT_FLAG_READONLY)

  604.             continue;

  605. 

  606.         switch (opt->type) {

  607.         case AV_OPT_TYPE_CONST:

  608.             /* Nothing to be done here */

  609.             break;

  610.         case AV_OPT_TYPE_FLAGS:

  611.         case AV_OPT_TYPE_INT:

  612.         case AV_OPT_TYPE_INT64:

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

  614.             break;

  615.         case AV_OPT_TYPE_DOUBLE:

  616.         case AV_OPT_TYPE_FLOAT:

  617.         {

  618.             double val;

  619.             val = opt->default_val.dbl;

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

  621.         }

  622.         break;

  623.         case AV_OPT_TYPE_RATIONAL:

  624.         {

  625.             AVRational val;

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

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

  628.         }

  629.         break;

  630.         case AV_OPT_TYPE_STRING:

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

  632.             break;

  633.         case AV_OPT_TYPE_BINARY:

  634.         case AV_OPT_TYPE_DICT:

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

  636.             break;

  637.         default:

  638.             av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n",

  639.                    opt->type, opt->name);

  640.         }

  641.     }

  642. }

  643. 

  644. /**

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

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

  647.  *

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

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

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

  651.  * separate key from value

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

  653.  * two pairs from each other

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

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

  656.  * of error:

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

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

  659.  * cannot be set

  660.  */

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

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

  663. {

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

  665.     char *val;

  666.     int ret;

  667. 

  668.     if (!key)

  669.         return AVERROR(ENOMEM);

  670. 

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

  672.         (*buf)++;

  673.         val = av_get_token(buf, pairs_sep);

  674.         if (!val) {

  675.             av_freep(&key);

  676.             return AVERROR(ENOMEM);

  677.         }

  678.     } else {

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

  680.         av_free(key);

  681.         return AVERROR(EINVAL);

  682.     }

  683. 

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

  685. 

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

  687.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  689. 

  690.     av_free(key);

  691.     av_free(val);

  692.     return ret;

  693. }

  694. 

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

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

  697. {

  698.     int ret, count = 0;

  699. 

  700.     if (!opts)

  701.         return 0;

  702. 

  703.     while (*opts) {

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

  705.             return ret;

  706.         count++;

  707. 

  708.         if (*opts)

  709.             opts++;

  710.     }

  711. 

  712.     return count;

  713. }

  714. 

  715. void av_opt_free(void *obj)

  716. {

  717.     const AVOption *o = NULL;

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

  719.         switch (o->type) {

  720.         case AV_OPT_TYPE_STRING:

  721.         case AV_OPT_TYPE_BINARY:

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

  723.             break;

  724. 

  725.         case AV_OPT_TYPE_DICT:

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

  727.             break;

  728. 

  729.         default:

  730.             break;

  731.         }

  732.     }

  733. }

  734. 

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

  736. {

  737.     AVDictionaryEntry *t = NULL;

  738.     AVDictionary    *tmp = NULL;

  739.     int ret = 0;

  740. 

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

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

  743.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  745.         else if (ret < 0) {

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

  747.             break;

  748.         }

  749.         ret = 0;

  750.     }

  751.     av_dict_free(options);

  752.     *options = tmp;

  753.     return ret;

  754. }

  755. 

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

  757.                             int opt_flags, int search_flags)

  758. {

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

  760. }

  761. 

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

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

  764. {

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

  766.     const AVOption *o = NULL;

  767. 

  768.     if (!c)

  769.         return NULL;

  770. 

  771.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  772.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  773.             const AVClass *child = NULL;

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

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

  776.                     return o;

  777.         } else {

  778.             void *child = NULL;

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

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

  781.                     return o;

  782.         }

  783.     }

  784. 

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

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

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

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

  789.             if (target_obj) {

  790.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  791.                     *target_obj = obj;

  792.                 else

  793.                     *target_obj = NULL;

  794.             }

  795.             return o;

  796.         }

  797.     }

  798.     return NULL;

  799. }

  800. 

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

  802. {

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

  804.     if (c->child_next)

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

  806.     return NULL;

  807. }

  808. 

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

  810. {

  811.     if (parent->child_class_next)

  812.         return parent->child_class_next(prev);

  813.     return NULL;

  814. }

  815. 

  816. static int opt_size(enum AVOptionType type)

  817. {

  818.     switch (type) {

  819.     case AV_OPT_TYPE_INT:

  820.     case AV_OPT_TYPE_FLAGS:

  821.         return sizeof(int);

  822.     case AV_OPT_TYPE_INT64:

  823.         return sizeof(int64_t);

  824.     case AV_OPT_TYPE_DOUBLE:

  825.         return sizeof(double);

  826.     case AV_OPT_TYPE_FLOAT:

  827.         return sizeof(float);

  828.     case AV_OPT_TYPE_STRING:

  829.         return sizeof(uint8_t *);

  830.     case AV_OPT_TYPE_RATIONAL:

  831.         return sizeof(AVRational);

  832.     case AV_OPT_TYPE_BINARY:

  833.         return sizeof(uint8_t *) + sizeof(int);

  834.     }

  835.     return AVERROR(EINVAL);

  836. }

  837. 

  838. int av_opt_copy(void *dst, const void *src)

  839. {

  840.     const AVOption *o = NULL;

  841.     const AVClass *c;

  842.     int ret = 0;

  843. 

  844.     if (!src)

  845.         return AVERROR(EINVAL);

  846. 

  847.     c = *(AVClass **)src;

  848.     if (!c || c != *(AVClass **)dst)

  849.         return AVERROR(EINVAL);

  850. 

  851.     while ((o = av_opt_next(src, o))) {

  852.         void *field_dst = (uint8_t *)dst + o->offset;

  853.         void *field_src = (uint8_t *)src + o->offset;

  854.         uint8_t **field_dst8 = (uint8_t **)field_dst;

  855.         uint8_t **field_src8 = (uint8_t **)field_src;

  856. 

  857.         if (o->type == AV_OPT_TYPE_STRING) {

  858.             set_string(dst, o, *field_src8, field_dst8);

  859.             if (*field_src8 && !*field_dst8)

  860.                 ret = AVERROR(ENOMEM);

  861.         } else if (o->type == AV_OPT_TYPE_BINARY) {

  862.             int len = *(int *)(field_src8 + 1);

  863.             if (*field_dst8 != *field_src8)

  864.                 av_freep(field_dst8);

  865.             if (len) {

  866.                 *field_dst8 = av_malloc(len);

  867.                 if (!*field_dst8) {

  868.                     ret = AVERROR(ENOMEM);

  869.                     len = 0;

  870.                 }

  871.                 memcpy(*field_dst8, *field_src8, len);

  872.             } else {

  873.                 *field_dst8 = NULL;

  874.             }

  875.             *(int *)(field_dst8 + 1) = len;

  876.         } else if (o->type == AV_OPT_TYPE_CONST) {

  877.             // do nothing

  878.         } else {

  879.             int size = opt_size(o->type);

  880.             if (size < 0)

  881.                 ret = size;

  882.             else

  883.                 memcpy(field_dst, field_src, size);

  884.         }

  885.     }

  886.     return ret;

  887. }