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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 "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.     AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass

  40.     const AVOption *o= c->option;

  41. 

  42.     for (; o && o->name; o++) {

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

  44.             return o;

  45.     }

  46.     return NULL;

  47. }

  48. #endif

  49. 

  50. #if FF_API_OLD_AVOPTIONS

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

  52. {

  53.     return av_opt_next(obj, last);

  54. }

  55. #endif

  56. 

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

  58. {

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

  60.     else if (last)            return NULL;

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

  62. }

  63. 

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

  65. {

  66.     switch (o->type) {

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

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

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

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

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

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

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

  74.                                                         return 0;

  75.     }

  76.     return AVERROR(EINVAL);

  77. }

  78. 

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

  80. {

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

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

  83.         return AVERROR(ERANGE);

  84.     }

  85. 

  86.     switch (o->type) {

  87.     case FF_OPT_TYPE_FLAGS:

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

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

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

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

  92.     case FF_OPT_TYPE_RATIONAL:

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

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

  95.         break;

  96.     default:

  97.         return AVERROR(EINVAL);

  98.     }

  99.     return 0;

  100. }

  101. 

  102. static const double const_values[] = {

  103.     M_PI,

  104.     M_E,

  105.     FF_QP2LAMBDA,

  106.     0

  107. };

  108. 

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

  110.     "PI",

  111.     "E",

  112.     "QP2LAMBDA",

  113.     0

  114. };

  115. 

  116. static int hexchar2int(char c) {

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

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

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

  120.     return -1;

  121. }

  122. 

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

  124. {

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

  126.     uint8_t *bin, *ptr;

  127.     int len = strlen(val);

  128. 

  129.     av_freep(dst);

  130.     *lendst = 0;

  131. 

  132.     if (len & 1)

  133.         return AVERROR(EINVAL);

  134.     len /= 2;

  135. 

  136.     ptr = bin = av_malloc(len);

  137.     while (*val) {

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

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

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

  141.             av_free(bin);

  142.             return AVERROR(EINVAL);

  143.         }

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

  145.     }

  146.     *dst = bin;

  147.     *lendst = len;

  148. 

  149.     return 0;

  150. }

  151. 

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

  153. {

  154.     av_freep(dst);

  155.     *dst = av_strdup(val);

  156.     return 0;

  157. }

  158. 

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

  160. {

  161.     int ret = 0, notfirst = 0;

  162.     for (;;) {

  163.         int i, den = 1;

  164.         char buf[256];

  165.         int cmd = 0;

  166.         double d, num = 1;

  167.         int64_t intnum = 1;

  168. 

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

  170.             cmd = *(val++);

  171. 

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

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

  174.         buf[i] = 0;

  175. 

  176.         {

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

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

  179.                 d = o_named->default_val.dbl;

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

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

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

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

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

  185.             else {

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

  187.                 if (res < 0) {

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

  189.                     return res;

  190.                 }

  191.             }

  192.         }

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

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

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

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

  197.         } else {

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

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

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

  201.         }

  202. 

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

  204.             return ret;

  205.         val += i;

  206.         if (!*val)

  207.             return 0;

  208.         notfirst = 1;

  209.     }

  210. 

  211.     return 0;

  212. }

  213. 

  214. #if FF_API_OLD_AVOPTIONS

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

  216. {

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

  218.     if (o_out)

  219.         *o_out = o;

  220.     return av_opt_set(obj, name, val, 0);

  221. }

  222. #endif

  223. 

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

  225. {

  226.     void *dst, *target_obj;

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

  228.     if (!o || !target_obj)

  229.         return AVERROR_OPTION_NOT_FOUND;

  230.     if (!val)

  231.         return AVERROR(EINVAL);

  232. 

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

  234.     switch (o->type) {

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

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

  237.     case FF_OPT_TYPE_FLAGS:

  238.     case FF_OPT_TYPE_INT:

  239.     case FF_OPT_TYPE_INT64:

  240.     case FF_OPT_TYPE_FLOAT:

  241.     case FF_OPT_TYPE_DOUBLE:

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

  243.     }

  244. 

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

  246.     return AVERROR(EINVAL);

  247. }

  248. 

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

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

  251.     {\

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

  253.             return AVERROR(EINVAL);\

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

  255.     }

  256. 

  257. OPT_EVAL_NUMBER(flags,  FF_OPT_TYPE_FLAGS,    int)

  258. OPT_EVAL_NUMBER(int,    FF_OPT_TYPE_INT,      int)

  259. OPT_EVAL_NUMBER(int64,  FF_OPT_TYPE_INT64,    int64_t)

  260. OPT_EVAL_NUMBER(float,  FF_OPT_TYPE_FLOAT,    float)

  261. OPT_EVAL_NUMBER(double, FF_OPT_TYPE_DOUBLE,   double)

  262. OPT_EVAL_NUMBER(q,      FF_OPT_TYPE_RATIONAL, AVRational)

  263. 

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

  265.                                   int search_flags)

  266. {

  267.     void *dst, *target_obj;

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

  269. 

  270.     if (!o || !target_obj)

  271.         return AVERROR_OPTION_NOT_FOUND;

  272. 

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

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

  275. }

  276. 

  277. #if FF_API_OLD_AVOPTIONS

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

  279. {

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

  281.     if (set_number(obj, name, n, 1, 1, 0) < 0)

  282.         return NULL;

  283.     return o;

  284. }

  285. 

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

  287. {

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

  289.     if (set_number(obj, name, n.num, n.den, 1, 0) < 0)

  290.         return NULL;

  291.     return o;

  292. }

  293. 

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

  295. {

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

  297.     if (set_number(obj, name, 1, 1, n, 0) < 0)

  298.         return NULL;

  299.     return o;

  300. }

  301. #endif

  302. 

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

  304. {

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

  306. }

  307. 

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

  309. {

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

  311. }

  312. 

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

  314. {

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

  316. }

  317. 

  318. #if FF_API_OLD_AVOPTIONS

  319. /**

  320.  *

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

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

  323.  */

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

  325. {

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

  327.     void *dst;

  328.     uint8_t *bin;

  329.     int len, i;

  330.     if (!o)

  331.         return NULL;

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

  333.         return NULL;

  334. 

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

  336.     if (o_out) *o_out= o;

  337. 

  338.     switch (o->type) {

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

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

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

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

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

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

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

  346.     case FF_OPT_TYPE_BINARY:

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

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

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

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

  351.         break;

  352.     default: return NULL;

  353.     }

  354.     return buf;

  355. }

  356. #endif

  357. 

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

  359. {

  360.     void *dst, *target_obj;

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

  362.     uint8_t *bin, buf[128];

  363.     int len, i, ret;

  364. 

  365.     if (!o || !target_obj)

  366.         return AVERROR_OPTION_NOT_FOUND;

  367. 

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

  369. 

  370.     buf[0] = 0;

  371.     switch (o->type) {

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

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

  374.     case FF_OPT_TYPE_INT64:     ret = snprintf(buf, sizeof(buf), "%"PRId64, *(int64_t*)dst);break;

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

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

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

  378.     case FF_OPT_TYPE_STRING:

  379.         if (*(uint8_t**)dst)

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

  381.         else

  382.             *out_val = av_strdup("");

  383.         return 0;

  384.     case FF_OPT_TYPE_BINARY:

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

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

  387.             return AVERROR(EINVAL);

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

  389.             return AVERROR(ENOMEM);

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

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

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

  393.         return 0;

  394.     default:

  395.         return AVERROR(EINVAL);

  396.     }

  397. 

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

  399.         return AVERROR(EINVAL);

  400.     *out_val = av_strdup(buf);

  401.     return 0;

  402. }

  403. 

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

  405.                       int search_flags)

  406. {

  407.     void *dst, *target_obj;

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

  409.     if (!o || !target_obj)

  410.         goto error;

  411. 

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

  413. 

  414.     if (o_out) *o_out= o;

  415. 

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

  417. 

  418. error:

  419.     *den=*intnum=0;

  420.     return -1;

  421. }

  422. 

  423. #if FF_API_OLD_AVOPTIONS

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

  425. {

  426.     int64_t intnum=1;

  427.     double num=1;

  428.     int den=1;

  429. 

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

  431.         return NAN;

  432.     return num*intnum/den;

  433. }

  434. 

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

  436. {

  437.     int64_t intnum=1;

  438.     double num=1;

  439.     int den=1;

  440. 

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

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

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

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

  445.     else

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

  447. }

  448. 

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

  450. {

  451.     int64_t intnum=1;

  452.     double num=1;

  453.     int den=1;

  454. 

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

  456.         return -1;

  457.     return num*intnum/den;

  458. }

  459. #endif

  460. 

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

  462. {

  463.     int64_t intnum = 1;

  464.     double     num = 1;

  465.     int   ret, den = 1;

  466. 

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

  468.         return ret;

  469.     *out_val = num*intnum/den;

  470.     return 0;

  471. }

  472. 

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

  474. {

  475.     int64_t intnum = 1;

  476.     double     num = 1;

  477.     int   ret, den = 1;

  478. 

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

  480.         return ret;

  481.     *out_val = num*intnum/den;

  482.     return 0;

  483. }

  484. 

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

  486. {

  487.     int64_t intnum = 1;

  488.     double     num = 1;

  489.     int   ret, den = 1;

  490. 

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

  492.         return ret;

  493. 

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

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

  496.     else

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

  498.     return 0;

  499. }

  500. 

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

  502. {

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

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

  505. 

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

  507.         return 0;

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

  509. }

  510. 

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

  512.                      int req_flags, int rej_flags)

  513. {

  514.     const AVOption *opt=NULL;

  515. 

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

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

  518.             continue;

  519. 

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

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

  522.          * Only print items from the requested unit.

  523.          */

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

  525.             continue;

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

  527.             continue;

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

  529.             continue;

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

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

  532.         else

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

  534. 

  535.         switch (opt->type) {

  536.             case FF_OPT_TYPE_FLAGS:

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

  538.                 break;

  539.             case FF_OPT_TYPE_INT:

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

  541.                 break;

  542.             case FF_OPT_TYPE_INT64:

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

  544.                 break;

  545.             case FF_OPT_TYPE_DOUBLE:

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

  547.                 break;

  548.             case FF_OPT_TYPE_FLOAT:

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

  550.                 break;

  551.             case FF_OPT_TYPE_STRING:

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

  553.                 break;

  554.             case FF_OPT_TYPE_RATIONAL:

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

  556.                 break;

  557.             case FF_OPT_TYPE_BINARY:

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

  559.                 break;

  560.             case FF_OPT_TYPE_CONST:

  561.             default:

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

  563.                 break;

  564.         }

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

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

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

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

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

  570. 

  571.         if (opt->help)

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

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

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

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

  576.         }

  577.     }

  578. }

  579. 

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

  581. {

  582.     if (!obj)

  583.         return -1;

  584. 

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

  586. 

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

  588. 

  589.     return 0;

  590. }

  591. 

  592. void av_opt_set_defaults(void *s)

  593. {

  594. #if FF_API_OLD_AVOPTIONS

  595.     av_opt_set_defaults2(s, 0, 0);

  596. }

  597. 

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

  599. {

  600. #endif

  601.     const AVOption *opt = NULL;

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

  603. #if FF_API_OLD_AVOPTIONS

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

  605.             continue;

  606. #endif

  607.         switch (opt->type) {

  608.             case FF_OPT_TYPE_CONST:

  609.                 /* Nothing to be done here */

  610.             break;

  611.             case FF_OPT_TYPE_FLAGS:

  612.             case FF_OPT_TYPE_INT: {

  613.                 int val;

  614.                 val = opt->default_val.dbl;

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

  616.             }

  617.             break;

  618.             case FF_OPT_TYPE_INT64:

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

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

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

  622.             break;

  623.             case FF_OPT_TYPE_DOUBLE:

  624.             case FF_OPT_TYPE_FLOAT: {

  625.                 double val;

  626.                 val = opt->default_val.dbl;

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

  628.             }

  629.             break;

  630.             case FF_OPT_TYPE_RATIONAL: {

  631.                 AVRational val;

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

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

  634.             }

  635.             break;

  636.             case FF_OPT_TYPE_STRING:

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

  638.                 break;

  639.             case FF_OPT_TYPE_BINARY:

  640.                 /* Cannot set default for binary */

  641.             break;

  642.             default:

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

  644.         }

  645.     }

  646. }

  647. 

  648. /**

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

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

  651.  *

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

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

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

  655.  * separate key from value

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

  657.  * two pairs from each other

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

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

  660.  * of error:

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

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

  663.  * cannot be set

  664.  */

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

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

  667. {

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

  669.     char *val;

  670.     int ret;

  671. 

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

  673.         (*buf)++;

  674.         val = av_get_token(buf, pairs_sep);

  675.     } else {

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

  677.         av_free(key);

  678.         return AVERROR(EINVAL);

  679.     }

  680. 

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

  682. 

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

  684.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  686. 

  687.     av_free(key);

  688.     av_free(val);

  689.     return ret;

  690. }

  691. 

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

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

  694. {

  695.     int ret, count = 0;

  696. 

  697.     while (*opts) {

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

  699.             return ret;

  700.         count++;

  701. 

  702.         if (*opts)

  703.             opts++;

  704.     }

  705. 

  706.     return count;

  707. }

  708. 

  709. void av_opt_free(void *obj)

  710. {

  711.     const AVOption *o = NULL;

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

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

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

  715. }

  716. 

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

  718. {

  719.     AVDictionaryEntry *t = NULL;

  720.     AVDictionary    *tmp = NULL;

  721.     int ret = 0;

  722. 

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

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

  725.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  727.         else if (ret < 0) {

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

  729.             break;

  730.         }

  731.         ret = 0;

  732.     }

  733.     av_dict_free(options);

  734.     *options = tmp;

  735.     return ret;

  736. }

  737. 

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

  739.                             int opt_flags, int search_flags)

  740. {

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

  742. }

  743. 

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

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

  746. {

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

  748.     const AVOption *o = NULL;

  749. 

  750.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  751.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  752.             const AVClass *child = NULL;

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

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

  755.                     return o;

  756.         } else {

  757.             void *child = NULL;

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

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

  760.                     return o;

  761.         }

  762.     }

  763. 

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

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

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

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

  768.             if (target_obj) {

  769.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  770.                     *target_obj = obj;

  771.                 else

  772.                     *target_obj = NULL;

  773.             }

  774.             return o;

  775.         }

  776.     }

  777.     return NULL;

  778. }

  779. 

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

  781. {

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

  783.     if (c->child_next)

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

  785.     return NULL;

  786. }

  787. 

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

  789. {

  790.     if (parent->child_class_next)

  791.         return parent->child_class_next(prev);

  792.     return NULL;

  793. }

  794. 

  795. #ifdef TEST

  796. 

  797. #undef printf

  798. 

  799. typedef struct TestContext

  800. {

  801.     const AVClass *class;

  802.     int num;

  803.     int toggle;

  804.     char *string;

  805.     int flags;

  806.     AVRational rational;

  807. } TestContext;

  808. 

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

  810. 

  811. #define TEST_FLAG_COOL 01

  812. #define TEST_FLAG_LAME 02

  813. #define TEST_FLAG_MU   04

  814. 

  815. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  824. {NULL},

  825. };

  826. 

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

  828. {

  829.     return "test";

  830. }

  831. 

  832. static const AVClass test_class = {

  833.     "TestContext",

  834.     test_get_name,

  835.     test_options

  836. };

  837. 

  838. int main(void)

  839. {

  840.     int i;

  841. 

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

  843.     {

  844.         TestContext test_ctx;

  845.         const char *options[] = {

  846.             "",

  847.             ":",

  848.             "=",

  849.             "foo=:",

  850.             ":=foo",

  851.             "=foo",

  852.             "foo=",

  853.             "foo",

  854.             "foo=val",

  855.             "foo==val",

  856.             "toggle=:",

  857.             "string=:",

  858.             "toggle=1 : foo",

  859.             "toggle=100",

  860.             "toggle==1",

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

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

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

  864.             "rational=-1/0",

  865.         };

  866. 

  867.         test_ctx.class = &test_class;

  868.         av_opt_set_defaults(&test_ctx);

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

  870. 

  871.         av_log_set_level(AV_LOG_DEBUG);

  872. 

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

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

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

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

  877.             printf("\n");

  878.         }

  879.     }

  880. 

  881.     return 0;

  882. }

  883. 

  884. #endif