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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.     if (!ptr)

  123.         return AVERROR(ENOMEM);

  124.     while (*val) {

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

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

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

  128.             av_free(bin);

  129.             return AVERROR(EINVAL);

  130.         }

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

  132.     }

  133.     *dst = bin;

  134.     *lendst = len;

  135. 

  136.     return 0;

  137. }

  138. 

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

  140. {

  141.     av_freep(dst);

  142.     *dst = av_strdup(val);

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

  144. }

  145. 

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

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

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

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

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

  151. 

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

  153. {

  154.     int ret = 0, notfirst = 0;

  155.     for (;;) {

  156.         int i, den = 1;

  157.         char buf[256];

  158.         int cmd = 0;

  159.         double d, num = 1;

  160.         int64_t intnum = 1;

  161. 

  162.         i = 0;

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

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

  165.                 cmd = *(val++);

  166.             else if (!notfirst)

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

  168.         }

  169. 

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

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

  172.         buf[i] = 0;

  173. 

  174.         {

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

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

  177.                 d = DEFAULT_NUMVAL(o_named);

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

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

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

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

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

  183.             else {

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

  185.                 if (res < 0) {

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

  187.                     return res;

  188.                 }

  189.             }

  190.         }

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

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

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

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

  195.         } else {

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

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

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

  199.         }

  200. 

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

  202.             return ret;

  203.         val += i;

  204.         if (!*val)

  205.             return 0;

  206.         notfirst = 1;

  207.     }

  208. 

  209.     return 0;

  210. }

  211. 

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

  213. {

  214.     void *dst, *target_obj;

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

  216.     if (!o || !target_obj)

  217.         return AVERROR_OPTION_NOT_FOUND;

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

  219.         return AVERROR(EINVAL);

  220. 

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

  222.     switch (o->type) {

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

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

  225.     case AV_OPT_TYPE_FLAGS:

  226.     case AV_OPT_TYPE_INT:

  227.     case AV_OPT_TYPE_INT64:

  228.     case AV_OPT_TYPE_FLOAT:

  229.     case AV_OPT_TYPE_DOUBLE:

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

  231.     }

  232. 

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

  234.     return AVERROR(EINVAL);

  235. }

  236. 

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

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

  239.     {\

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

  241.             return AVERROR(EINVAL);\

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

  243.     }

  244. 

  245. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  246. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  247. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  248. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  249. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  250. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  251. 

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

  253.                                   int search_flags)

  254. {

  255.     void *dst, *target_obj;

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

  257. 

  258.     if (!o || !target_obj)

  259.         return AVERROR_OPTION_NOT_FOUND;

  260. 

  261.     if (o->flags & AV_OPT_FLAG_READONLY)

  262.         return AVERROR(EINVAL);

  263. 

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

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

  266. }

  267. 

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

  269. {

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

  271. }

  272. 

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

  274. {

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

  276. }

  277. 

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

  279. {

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

  281. }

  282. 

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

  284. {

  285.     void *target_obj;

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

  287.     uint8_t *ptr;

  288.     uint8_t **dst;

  289.     int *lendst;

  290. 

  291.     if (!o || !target_obj)

  292.         return AVERROR_OPTION_NOT_FOUND;

  293. 

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

  295.         return AVERROR(EINVAL);

  296. 

  297.     ptr = av_malloc(len);

  298.     if (!ptr)

  299.         return AVERROR(ENOMEM);

  300. 

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

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

  303. 

  304.     av_free(*dst);

  305.     *dst = ptr;

  306.     *lendst = len;

  307.     memcpy(ptr, val, len);

  308. 

  309.     return 0;

  310. }

  311. 

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

  313. {

  314.     void *target_obj;

  315.     AVDictionary **dst;

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

  317. 

  318.     if (!o || !target_obj)

  319.         return AVERROR_OPTION_NOT_FOUND;

  320.     if (o->flags & AV_OPT_FLAG_READONLY)

  321.         return AVERROR(EINVAL);

  322. 

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

  324.     av_dict_free(dst);

  325.     av_dict_copy(dst, val, 0);

  326. 

  327.     return 0;

  328. }

  329. 

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

  331. {

  332.     void *dst, *target_obj;

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

  334.     uint8_t *bin, buf[128];

  335.     int len, i, ret;

  336. 

  337.     if (!o || !target_obj)

  338.         return AVERROR_OPTION_NOT_FOUND;

  339. 

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

  341. 

  342.     buf[0] = 0;

  343.     switch (o->type) {

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

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

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

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

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

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

  350.     case AV_OPT_TYPE_STRING:

  351.         if (*(uint8_t**)dst)

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

  353.         else

  354.             *out_val = av_strdup("");

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

  356.     case AV_OPT_TYPE_BINARY:

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

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

  359.             return AVERROR(EINVAL);

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

  361.             return AVERROR(ENOMEM);

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

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

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

  365.         return 0;

  366.     default:

  367.         return AVERROR(EINVAL);

  368.     }

  369. 

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

  371.         return AVERROR(EINVAL);

  372.     *out_val = av_strdup(buf);

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

  374. }

  375. 

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

  377.                       int search_flags)

  378. {

  379.     void *dst, *target_obj;

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

  381.     if (!o || !target_obj)

  382.         goto error;

  383. 

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

  385. 

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

  387. 

  388. error:

  389.     *den=*intnum=0;

  390.     return -1;

  391. }

  392. 

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

  394. {

  395.     int64_t intnum = 1;

  396.     double     num = 1;

  397.     int   ret, den = 1;

  398. 

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

  400.         return ret;

  401.     *out_val = num*intnum/den;

  402.     return 0;

  403. }

  404. 

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

  406. {

  407.     int64_t intnum = 1;

  408.     double     num = 1;

  409.     int   ret, den = 1;

  410. 

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

  412.         return ret;

  413.     *out_val = num*intnum/den;

  414.     return 0;

  415. }

  416. 

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

  418. {

  419.     int64_t intnum = 1;

  420.     double     num = 1;

  421.     int   ret, den = 1;

  422. 

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

  424.         return ret;

  425. 

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

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

  428.     else

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

  430.     return 0;

  431. }

  432. 

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

  434. {

  435.     void *target_obj;

  436.     AVDictionary *src;

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

  438. 

  439.     if (!o || !target_obj)

  440.         return AVERROR_OPTION_NOT_FOUND;

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

  442.         return AVERROR(EINVAL);

  443. 

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

  445.     av_dict_copy(out_val, src, 0);

  446. 

  447.     return 0;

  448. }

  449. 

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

  451. {

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

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

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

  455.     int64_t res;

  456. 

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

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

  459.         return 0;

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

  461. }

  462. 

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

  464.                      int req_flags, int rej_flags)

  465. {

  466.     const AVOption *opt=NULL;

  467. 

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

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

  470.             continue;

  471. 

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

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

  474.          * Only print items from the requested unit.

  475.          */

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

  477.             continue;

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

  479.             continue;

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

  481.             continue;

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

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

  484.         else

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

  486. 

  487.         switch (opt->type) {

  488.             case AV_OPT_TYPE_FLAGS:

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

  490.                 break;

  491.             case AV_OPT_TYPE_INT:

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

  493.                 break;

  494.             case AV_OPT_TYPE_INT64:

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

  496.                 break;

  497.             case AV_OPT_TYPE_DOUBLE:

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

  499.                 break;

  500.             case AV_OPT_TYPE_FLOAT:

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

  502.                 break;

  503.             case AV_OPT_TYPE_STRING:

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

  505.                 break;

  506.             case AV_OPT_TYPE_RATIONAL:

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

  508.                 break;

  509.             case AV_OPT_TYPE_BINARY:

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

  511.                 break;

  512.             case AV_OPT_TYPE_CONST:

  513.             default:

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

  515.                 break;

  516.         }

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

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

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

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

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

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

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

  524. 

  525.         if (opt->help)

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

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

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

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

  530.         }

  531.     }

  532. }

  533. 

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

  535. {

  536.     if (!obj)

  537.         return -1;

  538. 

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

  540. 

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

  542. 

  543.     return 0;

  544. }

  545. 

  546. void av_opt_set_defaults(void *s)

  547. {

  548.     const AVOption *opt = NULL;

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

  550.         if (opt->flags & AV_OPT_FLAG_READONLY)

  551.             continue;

  552. 

  553.         switch (opt->type) {

  554.             case AV_OPT_TYPE_CONST:

  555.                 /* Nothing to be done here */

  556.             break;

  557.             case AV_OPT_TYPE_FLAGS:

  558.             case AV_OPT_TYPE_INT:

  559.             case AV_OPT_TYPE_INT64:

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

  561.             break;

  562.             case AV_OPT_TYPE_DOUBLE:

  563.             case AV_OPT_TYPE_FLOAT: {

  564.                 double val;

  565.                 val = opt->default_val.dbl;

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

  567.             }

  568.             break;

  569.             case AV_OPT_TYPE_RATIONAL: {

  570.                 AVRational val;

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

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

  573.             }

  574.             break;

  575.             case AV_OPT_TYPE_STRING:

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

  577.                 break;

  578.             case AV_OPT_TYPE_BINARY:

  579.             case AV_OPT_TYPE_DICT:

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

  581.             break;

  582.             default:

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

  584.         }

  585.     }

  586. }

  587. 

  588. /**

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

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

  591.  *

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

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

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

  595.  * separate key from value

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

  597.  * two pairs from each other

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

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

  600.  * of error:

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

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

  603.  * cannot be set

  604.  */

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

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

  607. {

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

  609.     char *val;

  610.     int ret;

  611. 

  612.     if (!key)

  613.         return AVERROR(ENOMEM);

  614. 

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

  616.         (*buf)++;

  617.         val = av_get_token(buf, pairs_sep);

  618.         if (!val) {

  619.             av_freep(&key);

  620.             return AVERROR(ENOMEM);

  621.         }

  622.     } else {

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

  624.         av_free(key);

  625.         return AVERROR(EINVAL);

  626.     }

  627. 

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

  629. 

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

  631.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  633. 

  634.     av_free(key);

  635.     av_free(val);

  636.     return ret;

  637. }

  638. 

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

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

  641. {

  642.     int ret, count = 0;

  643. 

  644.     if (!opts)

  645.         return 0;

  646. 

  647.     while (*opts) {

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

  649.             return ret;

  650.         count++;

  651. 

  652.         if (*opts)

  653.             opts++;

  654.     }

  655. 

  656.     return count;

  657. }

  658. 

  659. void av_opt_free(void *obj)

  660. {

  661.     const AVOption *o = NULL;

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

  663.         switch (o->type) {

  664.         case AV_OPT_TYPE_STRING:

  665.         case AV_OPT_TYPE_BINARY:

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

  667.             break;

  668. 

  669.         case AV_OPT_TYPE_DICT:

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

  671.             break;

  672. 

  673.         default:

  674.             break;

  675.         }

  676.     }

  677. }

  678. 

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

  680. {

  681.     AVDictionaryEntry *t = NULL;

  682.     AVDictionary    *tmp = NULL;

  683.     int ret = 0;

  684. 

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

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

  687.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  689.         else if (ret < 0) {

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

  691.             break;

  692.         }

  693.         ret = 0;

  694.     }

  695.     av_dict_free(options);

  696.     *options = tmp;

  697.     return ret;

  698. }

  699. 

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

  701.                             int opt_flags, int search_flags)

  702. {

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

  704. }

  705. 

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

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

  708. {

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

  710.     const AVOption *o = NULL;

  711. 

  712.     if (!c)

  713.         return NULL;

  714. 

  715.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  716.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  717.             const AVClass *child = NULL;

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

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

  720.                     return o;

  721.         } else {

  722.             void *child = NULL;

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

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

  725.                     return o;

  726.         }

  727.     }

  728. 

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

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

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

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

  733.             if (target_obj) {

  734.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  735.                     *target_obj = obj;

  736.                 else

  737.                     *target_obj = NULL;

  738.             }

  739.             return o;

  740.         }

  741.     }

  742.     return NULL;

  743. }

  744. 

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

  746. {

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

  748.     if (c->child_next)

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

  750.     return NULL;

  751. }

  752. 

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

  754. {

  755.     if (parent->child_class_next)

  756.         return parent->child_class_next(prev);

  757.     return NULL;

  758. }

  759. 

  760. #ifdef TEST

  761. 

  762. typedef struct TestContext

  763. {

  764.     const AVClass *class;

  765.     int num;

  766.     int toggle;

  767.     char *string;

  768.     int flags;

  769.     AVRational rational;

  770. } TestContext;

  771. 

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

  773. 

  774. #define TEST_FLAG_COOL 01

  775. #define TEST_FLAG_LAME 02

  776. #define TEST_FLAG_MU   04

  777. 

  778. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  787. {NULL},

  788. };

  789. 

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

  791. {

  792.     return "test";

  793. }

  794. 

  795. static const AVClass test_class = {

  796.     "TestContext",

  797.     test_get_name,

  798.     test_options

  799. };

  800. 

  801. int main(void)

  802. {

  803.     int i;

  804. 

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

  806.     {

  807.         TestContext test_ctx;

  808.         const char *options[] = {

  809.             "",

  810.             ":",

  811.             "=",

  812.             "foo=:",

  813.             ":=foo",

  814.             "=foo",

  815.             "foo=",

  816.             "foo",

  817.             "foo=val",

  818.             "foo==val",

  819.             "toggle=:",

  820.             "string=:",

  821.             "toggle=1 : foo",

  822.             "toggle=100",

  823.             "toggle==1",

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

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

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

  827.             "rational=-1/0",

  828.         };

  829. 

  830.         test_ctx.class = &test_class;

  831.         av_opt_set_defaults(&test_ctx);

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

  833.         if (!test_ctx.string)

  834.             return AVERROR(ENOMEM);

  835. 

  836.         av_log_set_level(AV_LOG_DEBUG);

  837. 

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

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

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

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

  842.             printf("\n");

  843.         }

  844.     }

  845. 

  846.     return 0;

  847. }

  848. 

  849. #endif