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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 FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * AVOptions

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

  26.  */

  27. 

  28. #include "avutil.h"

  29. #include "avstring.h"

  30. #include "opt.h"

  31. #include "eval.h"

  32. #include "dict.h"

  33. #include "log.h"

  34. 

  35. #if FF_API_FIND_OPT

  36. //FIXME order them and do a bin search

  37. const AVOption *av_find_opt(void *v, const char *name, const char *unit, int mask, int flags)

  38. {

  39.     const AVOption *o = NULL;

  40. 

  41.     while ((o = av_next_option(v, o))) {

  42.         if (!strcmp(o->name, name) && (!unit || (o->unit && !strcmp(o->unit, unit))) && (o->flags & mask) == flags)

  43.             return o;

  44.     }

  45.     return NULL;

  46. }

  47. #endif

  48. 

  49. const AVOption *av_next_option(void *obj, const AVOption *last)

  50. {

  51.     if (last && last[1].name) return ++last;

  52.     else if (last || !(*(AVClass**)obj)->option->name) return NULL;

  53.     else                      return (*(AVClass**)obj)->option;

  54. }

  55. 

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

  57. {

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

  59.         av_log(obj, AV_LOG_ERROR, "Value %lf for parameter '%s' out of range\n", num, o->name);

  60.         return AVERROR(ERANGE);

  61.     }

  62. 

  63.     switch (o->type) {

  64.     case FF_OPT_TYPE_FLAGS:

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

  66.     case FF_OPT_TYPE_INT64: *(int64_t   *)dst= llrint(num/den)*intnum; break;

  67.     case FF_OPT_TYPE_FLOAT: *(float     *)dst= num*intnum/den;         break;

  68.     case FF_OPT_TYPE_DOUBLE:*(double    *)dst= num*intnum/den;         break;

  69.     case FF_OPT_TYPE_RATIONAL:

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

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

  72.         break;

  73.     default:

  74.         return AVERROR(EINVAL);

  75.     }

  76.     return 0;

  77. }

  78. 

  79. static const double const_values[] = {

  80.     M_PI,

  81.     M_E,

  82.     FF_QP2LAMBDA,

  83.     0

  84. };

  85. 

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

  87.     "PI",

  88.     "E",

  89.     "QP2LAMBDA",

  90.     0

  91. };

  92. 

  93. static int hexchar2int(char c) {

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

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

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

  97.     return -1;

  98. }

  99. 

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

  101. {

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

  103.     uint8_t *bin, *ptr;

  104.     int len = strlen(val);

  105. 

  106.     av_freep(dst);

  107.     *lendst = 0;

  108. 

  109.     if (len & 1)

  110.         return AVERROR(EINVAL);

  111.     len /= 2;

  112. 

  113.     ptr = bin = av_malloc(len);

  114.     while (*val) {

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

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

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

  118.             av_free(bin);

  119.             return AVERROR(EINVAL);

  120.         }

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

  122.     }

  123.     *dst = bin;

  124.     *lendst = len;

  125. 

  126.     return 0;

  127. }

  128. 

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

  130. {

  131.     av_freep(dst);

  132.     *dst = av_strdup(val);

  133.     return 0;

  134. }

  135. 

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

  137. {

  138.     int ret = 0, notfirst = 0;

  139.     for (;;) {

  140.         int i;

  141.         char buf[256];

  142.         int cmd = 0;

  143.         double d;

  144. 

  145.         if (*val == '+' || *val == '-')

  146.             cmd = *(val++);

  147. 

  148.         for (i = 0; i < sizeof(buf) - 1 && val[i] && val[i] != '+' && val[i] != '-'; i++)

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

  150.         buf[i] = 0;

  151. 

  152.         {

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

  154.             if (o_named && o_named->type == FF_OPT_TYPE_CONST)

  155.                 d = o_named->default_val.dbl;

  156.             else if (!strcmp(buf, "default")) d = o->default_val.dbl;

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

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

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

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

  161.             else {

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

  163.                 if (res < 0) {

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

  165.                     return res;

  166.                 }

  167.             }

  168.         }

  169.         if (o->type == FF_OPT_TYPE_FLAGS) {

  170.             if      (cmd == '+') d = av_get_int(obj, o->name, NULL) | (int64_t)d;

  171.             else if (cmd == '-') d = av_get_int(obj, o->name, NULL) &~(int64_t)d;

  172.         } else {

  173.             if      (cmd == '+') d = notfirst*av_get_double(obj, o->name, NULL) + d;

  174.             else if (cmd == '-') d = notfirst*av_get_double(obj, o->name, NULL) - d;

  175.         }

  176. 

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

  178.             return ret;

  179.         val += i;

  180.         if (!*val)

  181.             return 0;

  182.         notfirst = 1;

  183.     }

  184. 

  185.     return 0;

  186. }

  187. 

  188. int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out)

  189. {

  190.     const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);

  191.     void *dst;

  192.     if (o_out)

  193.         *o_out = o;

  194.     if (!o)

  195.         return AVERROR_OPTION_NOT_FOUND;

  196.     if (!val && o->type != FF_OPT_TYPE_STRING)

  197.         return AVERROR(EINVAL);

  198. 

  199.     dst = ((uint8_t*)obj) + o->offset;

  200.     switch (o->type) {

  201.     case FF_OPT_TYPE_STRING:   return set_string(obj, o, val, dst);

  202.     case FF_OPT_TYPE_BINARY:   return set_string_binary(obj, o, val, dst);

  203.     case FF_OPT_TYPE_FLAGS:

  204.     case FF_OPT_TYPE_INT:

  205.     case FF_OPT_TYPE_INT64:

  206.     case FF_OPT_TYPE_FLOAT:

  207.     case FF_OPT_TYPE_DOUBLE:

  208.     case FF_OPT_TYPE_RATIONAL: return set_string_number(obj, o, val, dst);

  209.     }

  210. 

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

  212.     return AVERROR(EINVAL);

  213. }

  214. 

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

  216. {

  217.     const AVOption *o = av_opt_find(obj, name, NULL, 0, 0);

  218.     void *dst;

  219. 

  220.     if (!o)

  221.         return NULL;

  222. 

  223.     dst = ((uint8_t*)obj) + o->offset;

  224.     if (write_number(obj, o, dst, num, den, intnum) < 0)

  225.         return NULL;

  226.     else

  227.         return o;

  228. }

  229. 

  230. const AVOption *av_set_double(void *obj, const char *name, double n)

  231. {

  232.     return set_number(obj, name, n, 1, 1);

  233. }

  234. 

  235. const AVOption *av_set_q(void *obj, const char *name, AVRational n)

  236. {

  237.     return set_number(obj, name, n.num, n.den, 1);

  238. }

  239. 

  240. const AVOption *av_set_int(void *obj, const char *name, int64_t n)

  241. {

  242.     return set_number(obj, name, 1, 1, n);

  243. }

  244. 

  245. /**

  246.  *

  247.  * @param buf a buffer which is used for returning non string values as strings, can be NULL

  248.  * @param buf_len allocated length in bytes of buf

  249.  */

  250. const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len)

  251. {

  252.     const AVOption *o = av_opt_find(obj, name, NULL, 0, AV_OPT_SEARCH_CHILDREN);

  253.     void *dst;

  254.     uint8_t *bin;

  255.     int len, i;

  256.     if (!o)

  257.         return NULL;

  258.     if (o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))

  259.         return NULL;

  260. 

  261.     dst= ((uint8_t*)obj) + o->offset;

  262.     if (o_out) *o_out= o;

  263. 

  264.     switch (o->type) {

  265.     case FF_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;

  266.     case FF_OPT_TYPE_INT:       snprintf(buf, buf_len, "%d" , *(int    *)dst);break;

  267.     case FF_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;

  268.     case FF_OPT_TYPE_FLOAT:     snprintf(buf, buf_len, "%f" , *(float  *)dst);break;

  269.     case FF_OPT_TYPE_DOUBLE:    snprintf(buf, buf_len, "%f" , *(double *)dst);break;

  270.     case FF_OPT_TYPE_RATIONAL:  snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;

  271.     case FF_OPT_TYPE_STRING:    return *(void**)dst;

  272.     case FF_OPT_TYPE_BINARY:

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

  274.         if (len >= (buf_len + 1)/2) return NULL;

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

  276.         for (i = 0; i < len; i++) snprintf(buf + i*2, 3, "%02X", bin[i]);

  277.         break;

  278.     default: return NULL;

  279.     }

  280.     return buf;

  281. }

  282. 

  283. static int get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum)

  284. {

  285.     const AVOption *o = av_opt_find(obj, name, NULL, 0, AV_OPT_SEARCH_CHILDREN);

  286.     void *dst;

  287.     if (!o || (o->offset<=0 && o->type != FF_OPT_TYPE_CONST))

  288.         goto error;

  289. 

  290.     dst= ((uint8_t*)obj) + o->offset;

  291. 

  292.     if (o_out) *o_out= o;

  293. 

  294.     switch (o->type) {

  295.     case FF_OPT_TYPE_FLAGS:     *intnum= *(unsigned int*)dst;return 0;

  296.     case FF_OPT_TYPE_INT:       *intnum= *(int    *)dst;return 0;

  297.     case FF_OPT_TYPE_INT64:     *intnum= *(int64_t*)dst;return 0;

  298.     case FF_OPT_TYPE_FLOAT:     *num=    *(float  *)dst;return 0;

  299.     case FF_OPT_TYPE_DOUBLE:    *num=    *(double *)dst;return 0;

  300.     case FF_OPT_TYPE_RATIONAL:  *intnum= ((AVRational*)dst)->num;

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

  302.                                                         return 0;

  303.     case FF_OPT_TYPE_CONST:     *intnum= o->default_val.dbl;return 0;

  304.     }

  305. error:

  306.     *den=*intnum=0;

  307.     return -1;

  308. }

  309. 

  310. double av_get_double(void *obj, const char *name, const AVOption **o_out)

  311. {

  312.     int64_t intnum=1;

  313.     double num=1;

  314.     int den=1;

  315. 

  316.     if (get_number(obj, name, o_out, &num, &den, &intnum) < 0)

  317.         return NAN;

  318.     return num*intnum/den;

  319. }

  320. 

  321. AVRational av_get_q(void *obj, const char *name, const AVOption **o_out)

  322. {

  323.     int64_t intnum=1;

  324.     double num=1;

  325.     int den=1;

  326. 

  327.     if (get_number(obj, name, o_out, &num, &den, &intnum) < 0)

  328.         return (AVRational){0, 0};

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

  330.         return (AVRational){intnum, den};

  331.     else

  332.         return av_d2q(num*intnum/den, 1<<24);

  333. }

  334. 

  335. int64_t av_get_int(void *obj, const char *name, const AVOption **o_out)

  336. {

  337.     int64_t intnum=1;

  338.     double num=1;

  339.     int den=1;

  340. 

  341.     if (get_number(obj, name, o_out, &num, &den, &intnum) < 0)

  342.         return -1;

  343.     return num*intnum/den;

  344. }

  345. 

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

  347. {

  348.     const AVOption *field = av_find_opt(obj, field_name, NULL, 0, 0);

  349.     const AVOption *flag  = av_find_opt(obj, flag_name,  NULL, 0, 0);

  350. 

  351.     if (!field || !flag || flag->type != FF_OPT_TYPE_CONST)

  352.         return 0;

  353.     return av_get_int(obj, field_name, NULL) & (int) flag->default_val.dbl;

  354. }

  355. 

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

  357.                      int req_flags, int rej_flags)

  358. {

  359.     const AVOption *opt=NULL;

  360. 

  361.     while ((opt= av_next_option(obj, opt))) {

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

  363.             continue;

  364. 

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

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

  367.          * Only print items from the requested unit.

  368.          */

  369.         if (!unit && opt->type==FF_OPT_TYPE_CONST)

  370.             continue;

  371.         else if (unit && opt->type!=FF_OPT_TYPE_CONST)

  372.             continue;

  373.         else if (unit && opt->type==FF_OPT_TYPE_CONST && strcmp(unit, opt->unit))

  374.             continue;

  375.         else if (unit && opt->type == FF_OPT_TYPE_CONST)

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

  377.         else

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

  379. 

  380.         switch (opt->type) {

  381.             case FF_OPT_TYPE_FLAGS:

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

  383.                 break;

  384.             case FF_OPT_TYPE_INT:

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

  386.                 break;

  387.             case FF_OPT_TYPE_INT64:

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

  389.                 break;

  390.             case FF_OPT_TYPE_DOUBLE:

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

  392.                 break;

  393.             case FF_OPT_TYPE_FLOAT:

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

  395.                 break;

  396.             case FF_OPT_TYPE_STRING:

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

  398.                 break;

  399.             case FF_OPT_TYPE_RATIONAL:

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

  401.                 break;

  402.             case FF_OPT_TYPE_BINARY:

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

  404.                 break;

  405.             case FF_OPT_TYPE_CONST:

  406.             default:

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

  408.                 break;

  409.         }

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

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

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

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

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

  415. 

  416.         if (opt->help)

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

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

  419.         if (opt->unit && opt->type != FF_OPT_TYPE_CONST) {

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

  421.         }

  422.     }

  423. }

  424. 

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

  426. {

  427.     if (!obj)

  428.         return -1;

  429. 

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

  431. 

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

  433. 

  434.     return 0;

  435. }

  436. 

  437. void av_opt_set_defaults(void *s)

  438. {

  439. #if FF_API_OLD_AVOPTIONS

  440.     av_opt_set_defaults2(s, 0, 0);

  441. }

  442. 

  443. void av_opt_set_defaults2(void *s, int mask, int flags)

  444. {

  445. #endif

  446.     const AVOption *opt = NULL;

  447.     while ((opt = av_next_option(s, opt)) != NULL) {

  448. #if FF_API_OLD_AVOPTIONS

  449.         if ((opt->flags & mask) != flags)

  450.             continue;

  451. #endif

  452.         switch (opt->type) {

  453.             case FF_OPT_TYPE_CONST:

  454.                 /* Nothing to be done here */

  455.             break;

  456.             case FF_OPT_TYPE_FLAGS:

  457.             case FF_OPT_TYPE_INT: {

  458.                 int val;

  459.                 val = opt->default_val.dbl;

  460.                 av_set_int(s, opt->name, val);

  461.             }

  462.             break;

  463.             case FF_OPT_TYPE_INT64:

  464.                 if ((double)(opt->default_val.dbl+0.6) == opt->default_val.dbl)

  465.                     av_log(s, AV_LOG_DEBUG, "loss of precision in default of %s\n", opt->name);

  466.                 av_set_int(s, opt->name, opt->default_val.dbl);

  467.             break;

  468.             case FF_OPT_TYPE_DOUBLE:

  469.             case FF_OPT_TYPE_FLOAT: {

  470.                 double val;

  471.                 val = opt->default_val.dbl;

  472.                 av_set_double(s, opt->name, val);

  473.             }

  474.             break;

  475.             case FF_OPT_TYPE_RATIONAL: {

  476.                 AVRational val;

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

  478.                 av_set_q(s, opt->name, val);

  479.             }

  480.             break;

  481.             case FF_OPT_TYPE_STRING:

  482.                 av_set_string3(s, opt->name, opt->default_val.str, 1, NULL);

  483.                 break;

  484.             case FF_OPT_TYPE_BINARY:

  485.                 /* Cannot set default for binary */

  486.             break;

  487.             default:

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

  489.         }

  490.     }

  491. }

  492. 

  493. /**

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

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

  496.  *

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

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

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

  500.  * separate key from value

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

  502.  * two pairs from each other

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

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

  505.  * of error:

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

  507.  * the error code issued by av_set_string3() if the key/value pair

  508.  * cannot be set

  509.  */

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

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

  512. {

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

  514.     char *val;

  515.     int ret;

  516. 

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

  518.         (*buf)++;

  519.         val = av_get_token(buf, pairs_sep);

  520.     } else {

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

  522.         av_free(key);

  523.         return AVERROR(EINVAL);

  524.     }

  525. 

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

  527. 

  528.     ret = av_set_string3(ctx, key, val, 1, NULL);

  529.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  531. 

  532.     av_free(key);

  533.     av_free(val);

  534.     return ret;

  535. }

  536. 

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

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

  539. {

  540.     int ret, count = 0;

  541. 

  542.     if (!opts)

  543.         return 0;

  544.     while (*opts) {

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

  546.             return ret;

  547.         count++;

  548. 

  549.         if (*opts)

  550.             opts++;

  551.     }

  552. 

  553.     return count;

  554. }

  555. 

  556. void av_opt_free(void *obj)

  557. {

  558.     const AVOption *o = NULL;

  559.     while ((o = av_next_option(obj, o)))

  560.         if (o->type == FF_OPT_TYPE_STRING || o->type == FF_OPT_TYPE_BINARY)

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

  562. }

  563. 

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

  565. {

  566.     AVDictionaryEntry *t = NULL;

  567.     AVDictionary    *tmp = NULL;

  568.     int ret = 0;

  569. 

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

  571.         ret = av_set_string3(obj, t->key, t->value, 1, NULL);

  572.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  574.         else if (ret < 0) {

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

  576.             break;

  577.         }

  578.         ret = 0;

  579.     }

  580.     av_dict_free(options);

  581.     *options = tmp;

  582.     return ret;

  583. }

  584. 

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

  586.                             int opt_flags, int search_flags)

  587. {

  588.     AVClass *c = *(AVClass**)obj;

  589.     const AVOption *o = NULL;

  590. 

  591.     if (c->opt_find && search_flags & AV_OPT_SEARCH_CHILDREN &&

  592.         (o = c->opt_find(obj, name, unit, opt_flags, search_flags)))

  593.         return o;

  594. 

  595.     while (o = av_next_option(obj, o)) {

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

  597.             ((!unit && o->type != FF_OPT_TYPE_CONST) ||

  598.              (unit  && o->type == FF_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit))))

  599.             return o;

  600.     }

  601.     return NULL;

  602. }

  603. 

  604. #ifdef TEST

  605. 

  606. #undef printf

  607. 

  608. typedef struct TestContext

  609. {

  610.     const AVClass *class;

  611.     int num;

  612.     int toggle;

  613.     char *string;

  614.     int flags;

  615.     AVRational rational;

  616. } TestContext;

  617. 

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

  619. 

  620. #define TEST_FLAG_COOL 01

  621. #define TEST_FLAG_LAME 02

  622. #define TEST_FLAG_MU   04

  623. 

  624. static const AVOption test_options[]= {

  625. {"num",      "set num",        OFFSET(num),      FF_OPT_TYPE_INT,      {0},              0,        100                 },

  626. {"toggle",   "set toggle",     OFFSET(toggle),   FF_OPT_TYPE_INT,      {0},              0,        1                   },

  627. {"rational", "set rational",   OFFSET(rational), FF_OPT_TYPE_RATIONAL, {0},              0,        10                  },

  628. {"string",   "set string",     OFFSET(string),   FF_OPT_TYPE_STRING,   {0},              CHAR_MIN, CHAR_MAX            },

  629. {"flags",    "set flags",      OFFSET(flags),    FF_OPT_TYPE_FLAGS,    {0},              0,        INT_MAX, 0, "flags" },

  630. {"cool",     "set cool flag ", 0,                FF_OPT_TYPE_CONST,    {TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },

  631. {"lame",     "set lame flag ", 0,                FF_OPT_TYPE_CONST,    {TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },

  632. {"mu",       "set mu flag ",   0,                FF_OPT_TYPE_CONST,    {TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },

  633. {NULL},

  634. };

  635. 

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

  637. {

  638.     return "test";

  639. }

  640. 

  641. static const AVClass test_class = {

  642.     "TestContext",

  643.     test_get_name,

  644.     test_options

  645. };

  646. 

  647. int main(void)

  648. {

  649.     int i;

  650. 

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

  652.     {

  653.         TestContext test_ctx;

  654.         const char *options[] = {

  655.             "",

  656.             ":",

  657.             "=",

  658.             "foo=:",

  659.             ":=foo",

  660.             "=foo",

  661.             "foo=",

  662.             "foo",

  663.             "foo=val",

  664.             "foo==val",

  665.             "toggle=:",

  666.             "string=:",

  667.             "toggle=1 : foo",

  668.             "toggle=100",

  669.             "toggle==1",

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

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

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

  673.             "rational=-1/0",

  674.         };

  675. 

  676.         test_ctx.class = &test_class;

  677.         av_opt_set_defaults(&test_ctx);

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

  679. 

  680.         av_log_set_level(AV_LOG_DEBUG);

  681. 

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

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

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

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

  686.             printf("\n");

  687.         }

  688.     }

  689. 

  690.     return 0;

  691. }

  692. 

  693. #endif