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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 AV_OPT_TYPE_FLAGS:     *intnum = *(unsigned int*)dst;return 0;

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

  69.     case AV_OPT_TYPE_INT64:     *intnum = *(int64_t     *)dst;return 0;

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

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

  72.     case AV_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 AV_OPT_TYPE_FLAGS:

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

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

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

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

  92.     case AV_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 == AV_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 == AV_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 AV_OPT_TYPE_STRING:   return set_string(obj, o, val, dst);

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

  237.     case AV_OPT_TYPE_FLAGS:

  238.     case AV_OPT_TYPE_INT:

  239.     case AV_OPT_TYPE_INT64:

  240.     case AV_OPT_TYPE_FLOAT:

  241.     case AV_OPT_TYPE_DOUBLE:

  242.     case AV_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,  AV_OPT_TYPE_FLAGS,    int)

  258. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  259. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  260. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  261. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  262. OPT_EVAL_NUMBER(q,      AV_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 != AV_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 AV_OPT_TYPE_FLAGS:     snprintf(buf, buf_len, "0x%08X",*(int    *)dst);break;

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

  341.     case AV_OPT_TYPE_INT64:     snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;

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

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

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

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

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

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

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

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

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

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

  378.     case AV_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 AV_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_opt_find(obj, field_name, NULL, 0, 0);

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

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

  506.     int64_t res;

  507. 

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

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

  510.         return 0;

  511.     return res & (int) flag->default_val.dbl;

  512. }

  513. 

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

  515.                      int req_flags, int rej_flags)

  516. {

  517.     const AVOption *opt=NULL;

  518. 

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

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

  521.             continue;

  522. 

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

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

  525.          * Only print items from the requested unit.

  526.          */

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

  528.             continue;

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

  530.             continue;

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

  532.             continue;

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

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

  535.         else

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

  537. 

  538.         switch (opt->type) {

  539.             case AV_OPT_TYPE_FLAGS:

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

  541.                 break;

  542.             case AV_OPT_TYPE_INT:

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

  544.                 break;

  545.             case AV_OPT_TYPE_INT64:

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

  547.                 break;

  548.             case AV_OPT_TYPE_DOUBLE:

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

  550.                 break;

  551.             case AV_OPT_TYPE_FLOAT:

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

  553.                 break;

  554.             case AV_OPT_TYPE_STRING:

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

  556.                 break;

  557.             case AV_OPT_TYPE_RATIONAL:

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

  559.                 break;

  560.             case AV_OPT_TYPE_BINARY:

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

  562.                 break;

  563.             case AV_OPT_TYPE_CONST:

  564.             default:

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

  566.                 break;

  567.         }

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

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

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

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

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

  573. 

  574.         if (opt->help)

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

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

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

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

  579.         }

  580.     }

  581. }

  582. 

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

  584. {

  585.     if (!obj)

  586.         return -1;

  587. 

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

  589. 

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

  591. 

  592.     return 0;

  593. }

  594. 

  595. void av_opt_set_defaults(void *s)

  596. {

  597. #if FF_API_OLD_AVOPTIONS

  598.     av_opt_set_defaults2(s, 0, 0);

  599. }

  600. 

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

  602. {

  603. #endif

  604.     const AVOption *opt = NULL;

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

  606. #if FF_API_OLD_AVOPTIONS

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

  608.             continue;

  609. #endif

  610.         switch (opt->type) {

  611.             case AV_OPT_TYPE_CONST:

  612.                 /* Nothing to be done here */

  613.             break;

  614.             case AV_OPT_TYPE_FLAGS:

  615.             case AV_OPT_TYPE_INT: {

  616.                 int val;

  617.                 val = opt->default_val.dbl;

  618.                 av_opt_set_int(s, opt->name, val, 0);

  619.             }

  620.             break;

  621.             case AV_OPT_TYPE_INT64:

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

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

  624.                 av_opt_set_int(s, opt->name, opt->default_val.dbl, 0);

  625.             break;

  626.             case AV_OPT_TYPE_DOUBLE:

  627.             case AV_OPT_TYPE_FLOAT: {

  628.                 double val;

  629.                 val = opt->default_val.dbl;

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

  631.             }

  632.             break;

  633.             case AV_OPT_TYPE_RATIONAL: {

  634.                 AVRational val;

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

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

  637.             }

  638.             break;

  639.             case AV_OPT_TYPE_STRING:

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

  641.                 break;

  642.             case AV_OPT_TYPE_BINARY:

  643.                 /* Cannot set default for binary */

  644.             break;

  645.             default:

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

  647.         }

  648.     }

  649. }

  650. 

  651. /**

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

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

  654.  *

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

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

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

  658.  * separate key from value

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

  660.  * two pairs from each other

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

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

  663.  * of error:

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

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

  666.  * cannot be set

  667.  */

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

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

  670. {

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

  672.     char *val;

  673.     int ret;

  674. 

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

  676.         (*buf)++;

  677.         val = av_get_token(buf, pairs_sep);

  678.     } else {

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

  680.         av_free(key);

  681.         return AVERROR(EINVAL);

  682.     }

  683. 

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

  685. 

  686.     ret = av_opt_set(ctx, key, val, 0);

  687.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  689. 

  690.     av_free(key);

  691.     av_free(val);

  692.     return ret;

  693. }

  694. 

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

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

  697. {

  698.     int ret, count = 0;

  699. 

  700.     if (!opts)

  701.         return 0;

  702. 

  703.     while (*opts) {

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

  705.             return ret;

  706.         count++;

  707. 

  708.         if (*opts)

  709.             opts++;

  710.     }

  711. 

  712.     return count;

  713. }

  714. 

  715. void av_opt_free(void *obj)

  716. {

  717.     const AVOption *o = NULL;

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

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

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

  721. }

  722. 

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

  724. {

  725.     AVDictionaryEntry *t = NULL;

  726.     AVDictionary    *tmp = NULL;

  727.     int ret = 0;

  728. 

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

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

  731.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  733.         else if (ret < 0) {

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

  735.             break;

  736.         }

  737.         ret = 0;

  738.     }

  739.     av_dict_free(options);

  740.     *options = tmp;

  741.     return ret;

  742. }

  743. 

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

  745.                             int opt_flags, int search_flags)

  746. {

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

  748. }

  749. 

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

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

  752. {

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

  754.     const AVOption *o = NULL;

  755. 

  756.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  757.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  758.             const AVClass *child = NULL;

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

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

  761.                     return o;

  762.         } else {

  763.             void *child = NULL;

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

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

  766.                     return o;

  767.         }

  768.     }

  769. 

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

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

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

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

  774.             if (target_obj) {

  775.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  776.                     *target_obj = obj;

  777.                 else

  778.                     *target_obj = NULL;

  779.             }

  780.             return o;

  781.         }

  782.     }

  783.     return NULL;

  784. }

  785. 

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

  787. {

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

  789.     if (c->child_next)

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

  791.     return NULL;

  792. }

  793. 

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

  795. {

  796.     if (parent->child_class_next)

  797.         return parent->child_class_next(prev);

  798.     return NULL;

  799. }

  800. 

  801. #ifdef TEST

  802. 

  803. #undef printf

  804. 

  805. typedef struct TestContext

  806. {

  807.     const AVClass *class;

  808.     int num;

  809.     int toggle;

  810.     char *string;

  811.     int flags;

  812.     AVRational rational;

  813. } TestContext;

  814. 

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

  816. 

  817. #define TEST_FLAG_COOL 01

  818. #define TEST_FLAG_LAME 02

  819. #define TEST_FLAG_MU   04

  820. 

  821. static const AVOption test_options[]= {

  822. {"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {0},              0,        100                 },

  823. {"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {0},              0,        1                   },

  824. {"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {0},              0,        10                  },

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

  826. {"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {0},              0,        INT_MAX, 0, "flags" },

  827. {"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },

  828. {"lame",     "set lame flag ", 0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },

  829. {"mu",       "set mu flag ",   0,                AV_OPT_TYPE_CONST,    {TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },

  830. {NULL},

  831. };

  832. 

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

  834. {

  835.     return "test";

  836. }

  837. 

  838. static const AVClass test_class = {

  839.     "TestContext",

  840.     test_get_name,

  841.     test_options

  842. };

  843. 

  844. int main(void)

  845. {

  846.     int i;

  847. 

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

  849.     {

  850.         TestContext test_ctx;

  851.         const char *options[] = {

  852.             "",

  853.             ":",

  854.             "=",

  855.             "foo=:",

  856.             ":=foo",

  857.             "=foo",

  858.             "foo=",

  859.             "foo",

  860.             "foo=val",

  861.             "foo==val",

  862.             "toggle=:",

  863.             "string=:",

  864.             "toggle=1 : foo",

  865.             "toggle=100",

  866.             "toggle==1",

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

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

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

  870.             "rational=-1/0",

  871.         };

  872. 

  873.         test_ctx.class = &test_class;

  874.         av_opt_set_defaults(&test_ctx);

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

  876. 

  877.         av_log_set_level(AV_LOG_DEBUG);

  878. 

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

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

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

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

  883.             printf("\n");

  884.         }

  885.     }

  886. 

  887.     return 0;

  888. }

  889. 

  890. #endif