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

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

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

  67.         return AVERROR(ERANGE);

  68.     }

  69. 

  70.     switch (o->type) {

  71.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  76.     case AV_OPT_TYPE_RATIONAL:

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

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

  79.         break;

  80.     default:

  81.         return AVERROR(EINVAL);

  82.     }

  83.     return 0;

  84. }

  85. 

  86. static const double const_values[] = {

  87.     M_PI,

  88.     M_E,

  89.     FF_QP2LAMBDA,

  90.     0

  91. };

  92. 

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

  94.     "PI",

  95.     "E",

  96.     "QP2LAMBDA",

  97.     0

  98. };

  99. 

  100. static int hexchar2int(char c) {

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

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

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

  104.     return -1;

  105. }

  106. 

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

  108. {

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

  110.     uint8_t *bin, *ptr;

  111.     int len = strlen(val);

  112. 

  113.     av_freep(dst);

  114.     *lendst = 0;

  115. 

  116.     if (len & 1)

  117.         return AVERROR(EINVAL);

  118.     len /= 2;

  119. 

  120.     ptr = bin = av_malloc(len);

  121.     while (*val) {

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

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

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

  125.             av_free(bin);

  126.             return AVERROR(EINVAL);

  127.         }

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

  129.     }

  130.     *dst = bin;

  131.     *lendst = len;

  132. 

  133.     return 0;

  134. }

  135. 

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

  137. {

  138.     av_freep(dst);

  139.     *dst = av_strdup(val);

  140.     return 0;

  141. }

  142. 

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

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

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

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

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

  148. 

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

  150. {

  151.     int ret = 0, notfirst = 0;

  152.     for (;;) {

  153.         int i, den = 1;

  154.         char buf[256];

  155.         int cmd = 0;

  156.         double d, num = 1;

  157.         int64_t intnum = 1;

  158. 

  159.         i = 0;

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

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

  162.                 cmd = *(val++);

  163.             else if (!notfirst)

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

  165.         }

  166. 

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

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

  169.         buf[i] = 0;

  170. 

  171.         {

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

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

  174.                 d = DEFAULT_NUMVAL(o_named);

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

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

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

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

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

  180.             else {

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

  182.                 if (res < 0) {

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

  184.                     return res;

  185.                 }

  186.             }

  187.         }

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

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

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

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

  192.         } else {

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

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

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

  196.         }

  197. 

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

  199.             return ret;

  200.         val += i;

  201.         if (!*val)

  202.             return 0;

  203.         notfirst = 1;

  204.     }

  205. 

  206.     return 0;

  207. }

  208. 

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

  210. {

  211.     void *dst, *target_obj;

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

  213.     if (!o || !target_obj)

  214.         return AVERROR_OPTION_NOT_FOUND;

  215.     if (!val)

  216.         return AVERROR(EINVAL);

  217. 

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

  219.     switch (o->type) {

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

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

  222.     case AV_OPT_TYPE_FLAGS:

  223.     case AV_OPT_TYPE_INT:

  224.     case AV_OPT_TYPE_INT64:

  225.     case AV_OPT_TYPE_FLOAT:

  226.     case AV_OPT_TYPE_DOUBLE:

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

  228.     }

  229. 

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

  231.     return AVERROR(EINVAL);

  232. }

  233. 

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

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

  236.     {\

  237.         if (!o || o->type != opttype)\

  238.             return AVERROR(EINVAL);\

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

  240.     }

  241. 

  242. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  243. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  244. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  245. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  246. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  247. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  248. 

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

  250.                                   int search_flags)

  251. {

  252.     void *dst, *target_obj;

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

  254. 

  255.     if (!o || !target_obj)

  256.         return AVERROR_OPTION_NOT_FOUND;

  257. 

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

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

  260. }

  261. 

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

  263. {

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

  265. }

  266. 

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

  268. {

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

  270. }

  271. 

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

  273. {

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

  275. }

  276. 

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

  278. {

  279.     void *target_obj;

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

  281.     uint8_t *ptr;

  282.     uint8_t **dst;

  283.     int *lendst;

  284. 

  285.     if (!o || !target_obj)

  286.         return AVERROR_OPTION_NOT_FOUND;

  287. 

  288.     if (o->type != AV_OPT_TYPE_BINARY)

  289.         return AVERROR(EINVAL);

  290. 

  291.     ptr = av_malloc(len);

  292.     if (!ptr)

  293.         return AVERROR(ENOMEM);

  294. 

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

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

  297. 

  298.     av_free(*dst);

  299.     *dst = ptr;

  300.     *lendst = len;

  301.     memcpy(ptr, val, len);

  302. 

  303.     return 0;

  304. }

  305. 

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

  307. {

  308.     void *dst, *target_obj;

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

  310.     uint8_t *bin, buf[128];

  311.     int len, i, ret;

  312. 

  313.     if (!o || !target_obj)

  314.         return AVERROR_OPTION_NOT_FOUND;

  315. 

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

  317. 

  318.     buf[0] = 0;

  319.     switch (o->type) {

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

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

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

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

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

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

  326.     case AV_OPT_TYPE_STRING:

  327.         if (*(uint8_t**)dst)

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

  329.         else

  330.             *out_val = av_strdup("");

  331.         return 0;

  332.     case AV_OPT_TYPE_BINARY:

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

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

  335.             return AVERROR(EINVAL);

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

  337.             return AVERROR(ENOMEM);

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

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

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

  341.         return 0;

  342.     default:

  343.         return AVERROR(EINVAL);

  344.     }

  345. 

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

  347.         return AVERROR(EINVAL);

  348.     *out_val = av_strdup(buf);

  349.     return 0;

  350. }

  351. 

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

  353.                       int search_flags)

  354. {

  355.     void *dst, *target_obj;

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

  357.     if (!o || !target_obj)

  358.         goto error;

  359. 

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

  361. 

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

  363. 

  364. error:

  365.     *den=*intnum=0;

  366.     return -1;

  367. }

  368. 

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

  370. {

  371.     int64_t intnum = 1;

  372.     double     num = 1;

  373.     int   ret, den = 1;

  374. 

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

  376.         return ret;

  377.     *out_val = num*intnum/den;

  378.     return 0;

  379. }

  380. 

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

  382. {

  383.     int64_t intnum = 1;

  384.     double     num = 1;

  385.     int   ret, den = 1;

  386. 

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

  388.         return ret;

  389.     *out_val = num*intnum/den;

  390.     return 0;

  391. }

  392. 

  393. int av_opt_get_q(void *obj, const char *name, int search_flags, AVRational *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. 

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

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

  404.     else

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

  406.     return 0;

  407. }

  408. 

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

  410. {

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

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

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

  414.     int64_t res;

  415. 

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

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

  418.         return 0;

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

  420. }

  421. 

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

  423.                      int req_flags, int rej_flags)

  424. {

  425.     const AVOption *opt=NULL;

  426. 

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

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

  429.             continue;

  430. 

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

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

  433.          * Only print items from the requested unit.

  434.          */

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

  436.             continue;

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

  438.             continue;

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

  440.             continue;

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

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

  443.         else

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

  445. 

  446.         switch (opt->type) {

  447.             case AV_OPT_TYPE_FLAGS:

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

  449.                 break;

  450.             case AV_OPT_TYPE_INT:

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

  452.                 break;

  453.             case AV_OPT_TYPE_INT64:

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

  455.                 break;

  456.             case AV_OPT_TYPE_DOUBLE:

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

  458.                 break;

  459.             case AV_OPT_TYPE_FLOAT:

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

  461.                 break;

  462.             case AV_OPT_TYPE_STRING:

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

  464.                 break;

  465.             case AV_OPT_TYPE_RATIONAL:

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

  467.                 break;

  468.             case AV_OPT_TYPE_BINARY:

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

  470.                 break;

  471.             case AV_OPT_TYPE_CONST:

  472.             default:

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

  474.                 break;

  475.         }

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

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

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

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

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

  481. 

  482.         if (opt->help)

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

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

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

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

  487.         }

  488.     }

  489. }

  490. 

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

  492. {

  493.     if (!obj)

  494.         return -1;

  495. 

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

  497. 

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

  499. 

  500.     return 0;

  501. }

  502. 

  503. void av_opt_set_defaults(void *s)

  504. {

  505.     const AVOption *opt = NULL;

  506.     while ((opt = av_opt_next(s, opt)) != NULL) {

  507.         switch (opt->type) {

  508.             case AV_OPT_TYPE_CONST:

  509.                 /* Nothing to be done here */

  510.             break;

  511.             case AV_OPT_TYPE_FLAGS:

  512.             case AV_OPT_TYPE_INT:

  513.             case AV_OPT_TYPE_INT64:

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

  515.             break;

  516.             case AV_OPT_TYPE_DOUBLE:

  517.             case AV_OPT_TYPE_FLOAT: {

  518.                 double val;

  519.                 val = opt->default_val.dbl;

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

  521.             }

  522.             break;

  523.             case AV_OPT_TYPE_RATIONAL: {

  524.                 AVRational val;

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

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

  527.             }

  528.             break;

  529.             case AV_OPT_TYPE_STRING:

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

  531.                 break;

  532.             case AV_OPT_TYPE_BINARY:

  533.                 /* Cannot set default for binary */

  534.             break;

  535.             default:

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

  537.         }

  538.     }

  539. }

  540. 

  541. /**

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

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

  544.  *

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

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

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

  548.  * separate key from value

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

  550.  * two pairs from each other

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

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

  553.  * of error:

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

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

  556.  * cannot be set

  557.  */

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

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

  560. {

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

  562.     char *val;

  563.     int ret;

  564. 

  565.     if (!key)

  566.         return AVERROR(ENOMEM);

  567. 

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

  569.         (*buf)++;

  570.         val = av_get_token(buf, pairs_sep);

  571.         if (!val) {

  572.             av_freep(&key);

  573.             return AVERROR(ENOMEM);

  574.         }

  575.     } else {

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

  577.         av_free(key);

  578.         return AVERROR(EINVAL);

  579.     }

  580. 

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

  582. 

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

  584.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  586. 

  587.     av_free(key);

  588.     av_free(val);

  589.     return ret;

  590. }

  591. 

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

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

  594. {

  595.     int ret, count = 0;

  596. 

  597.     if (!opts)

  598.         return 0;

  599. 

  600.     while (*opts) {

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

  602.             return ret;

  603.         count++;

  604. 

  605.         if (*opts)

  606.             opts++;

  607.     }

  608. 

  609.     return count;

  610. }

  611. 

  612. void av_opt_free(void *obj)

  613. {

  614.     const AVOption *o = NULL;

  615.     while ((o = av_opt_next(obj, o)))

  616.         if (o->type == AV_OPT_TYPE_STRING || o->type == AV_OPT_TYPE_BINARY)

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

  618. }

  619. 

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

  621. {

  622.     AVDictionaryEntry *t = NULL;

  623.     AVDictionary    *tmp = NULL;

  624.     int ret = 0;

  625. 

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

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

  628.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  630.         else if (ret < 0) {

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

  632.             break;

  633.         }

  634.         ret = 0;

  635.     }

  636.     av_dict_free(options);

  637.     *options = tmp;

  638.     return ret;

  639. }

  640. 

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

  642.                             int opt_flags, int search_flags)

  643. {

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

  645. }

  646. 

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

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

  649. {

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

  651.     const AVOption *o = NULL;

  652. 

  653.     if (!c)

  654.         return NULL;

  655. 

  656.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  657.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  658.             const AVClass *child = NULL;

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

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

  661.                     return o;

  662.         } else {

  663.             void *child = NULL;

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

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

  666.                     return o;

  667.         }

  668.     }

  669. 

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

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

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

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

  674.             if (target_obj) {

  675.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  676.                     *target_obj = obj;

  677.                 else

  678.                     *target_obj = NULL;

  679.             }

  680.             return o;

  681.         }

  682.     }

  683.     return NULL;

  684. }

  685. 

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

  687. {

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

  689.     if (c->child_next)

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

  691.     return NULL;

  692. }

  693. 

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

  695. {

  696.     if (parent->child_class_next)

  697.         return parent->child_class_next(prev);

  698.     return NULL;

  699. }

  700. 

  701. #ifdef TEST

  702. 

  703. typedef struct TestContext

  704. {

  705.     const AVClass *class;

  706.     int num;

  707.     int toggle;

  708.     char *string;

  709.     int flags;

  710.     AVRational rational;

  711. } TestContext;

  712. 

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

  714. 

  715. #define TEST_FLAG_COOL 01

  716. #define TEST_FLAG_LAME 02

  717. #define TEST_FLAG_MU   04

  718. 

  719. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  728. {NULL},

  729. };

  730. 

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

  732. {

  733.     return "test";

  734. }

  735. 

  736. static const AVClass test_class = {

  737.     "TestContext",

  738.     test_get_name,

  739.     test_options

  740. };

  741. 

  742. int main(void)

  743. {

  744.     int i;

  745. 

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

  747.     {

  748.         TestContext test_ctx;

  749.         const char *options[] = {

  750.             "",

  751.             ":",

  752.             "=",

  753.             "foo=:",

  754.             ":=foo",

  755.             "=foo",

  756.             "foo=",

  757.             "foo",

  758.             "foo=val",

  759.             "foo==val",

  760.             "toggle=:",

  761.             "string=:",

  762.             "toggle=1 : foo",

  763.             "toggle=100",

  764.             "toggle==1",

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

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

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

  768.             "rational=-1/0",

  769.         };

  770. 

  771.         test_ctx.class = &test_class;

  772.         av_opt_set_defaults(&test_ctx);

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

  774. 

  775.         av_log_set_level(AV_LOG_DEBUG);

  776. 

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

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

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

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

  781.             printf("\n");

  782.         }

  783.     }

  784. 

  785.     return 0;

  786. }

  787. 

  788. #endif