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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.     AVClass *class = *(AVClass**)obj;

  60.     if (!last && class->option[0].name) return class->option;

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

  62.     return NULL;

  63. }

  64. 

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

  66. {

  67.     switch (o->type) {

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

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

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

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

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

  73.     case AV_OPT_TYPE_RATIONAL:  *intnum = ((AVRational*)dst)->num;

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

  75.                                                         return 0;

  76.     }

  77.     return AVERROR(EINVAL);

  78. }

  79. 

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

  81. {

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

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

  84.         return AVERROR(ERANGE);

  85.     }

  86. 

  87.     switch (o->type) {

  88.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  93.     case AV_OPT_TYPE_RATIONAL:

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

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

  96.         break;

  97.     default:

  98.         return AVERROR(EINVAL);

  99.     }

  100.     return 0;

  101. }

  102. 

  103. static const double const_values[] = {

  104.     M_PI,

  105.     M_E,

  106.     FF_QP2LAMBDA,

  107.     0

  108. };

  109. 

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

  111.     "PI",

  112.     "E",

  113.     "QP2LAMBDA",

  114.     0

  115. };

  116. 

  117. static int hexchar2int(char c) {

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

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

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

  121.     return -1;

  122. }

  123. 

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

  125. {

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

  127.     uint8_t *bin, *ptr;

  128.     int len = strlen(val);

  129. 

  130.     av_freep(dst);

  131.     *lendst = 0;

  132. 

  133.     if (len & 1)

  134.         return AVERROR(EINVAL);

  135.     len /= 2;

  136. 

  137.     ptr = bin = av_malloc(len);

  138.     while (*val) {

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

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

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

  142.             av_free(bin);

  143.             return AVERROR(EINVAL);

  144.         }

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

  146.     }

  147.     *dst = bin;

  148.     *lendst = len;

  149. 

  150.     return 0;

  151. }

  152. 

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

  154. {

  155.     av_freep(dst);

  156.     *dst = av_strdup(val);

  157.     return 0;

  158. }

  159. 

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

  161. {

  162.     int ret = 0, notfirst = 0;

  163.     for (;;) {

  164.         int i, den = 1;

  165.         char buf[256];

  166.         int cmd = 0;

  167.         double d, num = 1;

  168.         int64_t intnum = 1;

  169. 

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

  171.             cmd = *(val++);

  172. 

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

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

  175.         buf[i] = 0;

  176. 

  177.         {

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

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

  180.                 d = o_named->default_val.dbl;

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

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

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

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

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

  186.             else {

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

  188.                 if (res < 0) {

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

  190.                     return res;

  191.                 }

  192.             }

  193.         }

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

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

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

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

  198.         } else {

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

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

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

  202.         }

  203. 

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

  205.             return ret;

  206.         val += i;

  207.         if (!*val)

  208.             return 0;

  209.         notfirst = 1;

  210.     }

  211. 

  212.     return 0;

  213. }

  214. 

  215. #if FF_API_OLD_AVOPTIONS

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

  217. {

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

  219.     if (o_out)

  220.         *o_out = o;

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

  222. }

  223. #endif

  224. 

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

  226. {

  227.     void *dst, *target_obj;

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

  229.     if (!o || !target_obj)

  230.         return AVERROR_OPTION_NOT_FOUND;

  231.     if (!val)

  232.         return AVERROR(EINVAL);

  233. 

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

  235.     switch (o->type) {

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

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

  238.     case AV_OPT_TYPE_FLAGS:

  239.     case AV_OPT_TYPE_INT:

  240.     case AV_OPT_TYPE_INT64:

  241.     case AV_OPT_TYPE_FLOAT:

  242.     case AV_OPT_TYPE_DOUBLE:

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

  244.     }

  245. 

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

  247.     return AVERROR(EINVAL);

  248. }

  249. 

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

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

  252.     {\

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

  254.             return AVERROR(EINVAL);\

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

  256.     }

  257. 

  258. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  259. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  260. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  261. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  262. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  263. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  264. 

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

  266.                                   int search_flags)

  267. {

  268.     void *dst, *target_obj;

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

  270. 

  271.     if (!o || !target_obj)

  272.         return AVERROR_OPTION_NOT_FOUND;

  273. 

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

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

  276. }

  277. 

  278. #if FF_API_OLD_AVOPTIONS

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

  280. {

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

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

  283.         return NULL;

  284.     return o;

  285. }

  286. 

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

  288. {

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

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

  291.         return NULL;

  292.     return o;

  293. }

  294. 

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

  296. {

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

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

  299.         return NULL;

  300.     return o;

  301. }

  302. #endif

  303. 

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

  305. {

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

  307. }

  308. 

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

  310. {

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

  312. }

  313. 

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

  315. {

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

  317. }

  318. 

  319. #if FF_API_OLD_AVOPTIONS

  320. /**

  321.  *

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

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

  324.  */

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

  326. {

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

  328.     void *dst;

  329.     uint8_t *bin;

  330.     int len, i;

  331.     if (!o)

  332.         return NULL;

  333.     if (o->type != AV_OPT_TYPE_STRING && (!buf || !buf_len))

  334.         return NULL;

  335. 

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

  337.     if (o_out) *o_out= o;

  338. 

  339.     switch (o->type) {

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

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

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

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

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

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

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

  347.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  352.         break;

  353.     default: return NULL;

  354.     }

  355.     return buf;

  356. }

  357. #endif

  358. 

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

  360. {

  361.     void *dst, *target_obj;

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

  363.     uint8_t *bin, buf[128];

  364.     int len, i, ret;

  365. 

  366.     if (!o || !target_obj)

  367.         return AVERROR_OPTION_NOT_FOUND;

  368. 

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

  370. 

  371.     buf[0] = 0;

  372.     switch (o->type) {

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

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

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

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

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

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

  379.     case AV_OPT_TYPE_STRING:

  380.         if (*(uint8_t**)dst)

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

  382.         else

  383.             *out_val = av_strdup("");

  384.         return 0;

  385.     case AV_OPT_TYPE_BINARY:

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

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

  388.             return AVERROR(EINVAL);

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

  390.             return AVERROR(ENOMEM);

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

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

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

  394.         return 0;

  395.     default:

  396.         return AVERROR(EINVAL);

  397.     }

  398. 

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

  400.         return AVERROR(EINVAL);

  401.     *out_val = av_strdup(buf);

  402.     return 0;

  403. }

  404. 

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

  406.                       int search_flags)

  407. {

  408.     void *dst, *target_obj;

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

  410.     if (!o || !target_obj)

  411.         goto error;

  412. 

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

  414. 

  415.     if (o_out) *o_out= o;

  416. 

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

  418. 

  419. error:

  420.     *den=*intnum=0;

  421.     return -1;

  422. }

  423. 

  424. #if FF_API_OLD_AVOPTIONS

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

  426. {

  427.     int64_t intnum=1;

  428.     double num=1;

  429.     int den=1;

  430. 

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

  432.         return NAN;

  433.     return num*intnum/den;

  434. }

  435. 

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

  437. {

  438.     int64_t intnum=1;

  439.     double num=1;

  440.     int den=1;

  441. 

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

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

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

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

  446.     else

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

  448. }

  449. 

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

  451. {

  452.     int64_t intnum=1;

  453.     double num=1;

  454.     int den=1;

  455. 

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

  457.         return -1;

  458.     return num*intnum/den;

  459. }

  460. #endif

  461. 

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

  463. {

  464.     int64_t intnum = 1;

  465.     double     num = 1;

  466.     int   ret, den = 1;

  467. 

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

  469.         return ret;

  470.     *out_val = num*intnum/den;

  471.     return 0;

  472. }

  473. 

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

  475. {

  476.     int64_t intnum = 1;

  477.     double     num = 1;

  478.     int   ret, den = 1;

  479. 

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

  481.         return ret;

  482.     *out_val = num*intnum/den;

  483.     return 0;

  484. }

  485. 

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

  487. {

  488.     int64_t intnum = 1;

  489.     double     num = 1;

  490.     int   ret, den = 1;

  491. 

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

  493.         return ret;

  494. 

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

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

  497.     else

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

  499.     return 0;

  500. }

  501. 

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

  503. {

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

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

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

  507.     int64_t res;

  508. 

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

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

  511.         return 0;

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

  513. }

  514. 

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

  516.                      int req_flags, int rej_flags)

  517. {

  518.     const AVOption *opt=NULL;

  519. 

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

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

  522.             continue;

  523. 

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

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

  526.          * Only print items from the requested unit.

  527.          */

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

  529.             continue;

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

  531.             continue;

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

  533.             continue;

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

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

  536.         else

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

  538. 

  539.         switch (opt->type) {

  540.             case AV_OPT_TYPE_FLAGS:

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

  542.                 break;

  543.             case AV_OPT_TYPE_INT:

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

  545.                 break;

  546.             case AV_OPT_TYPE_INT64:

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

  548.                 break;

  549.             case AV_OPT_TYPE_DOUBLE:

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

  551.                 break;

  552.             case AV_OPT_TYPE_FLOAT:

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

  554.                 break;

  555.             case AV_OPT_TYPE_STRING:

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

  557.                 break;

  558.             case AV_OPT_TYPE_RATIONAL:

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

  560.                 break;

  561.             case AV_OPT_TYPE_BINARY:

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

  563.                 break;

  564.             case AV_OPT_TYPE_CONST:

  565.             default:

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

  567.                 break;

  568.         }

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

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

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

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

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

  574. 

  575.         if (opt->help)

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

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

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

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

  580.         }

  581.     }

  582. }

  583. 

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

  585. {

  586.     if (!obj)

  587.         return -1;

  588. 

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

  590. 

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

  592. 

  593.     return 0;

  594. }

  595. 

  596. void av_opt_set_defaults(void *s)

  597. {

  598. #if FF_API_OLD_AVOPTIONS

  599.     av_opt_set_defaults2(s, 0, 0);

  600. }

  601. 

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

  603. {

  604. #endif

  605.     const AVOption *opt = NULL;

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

  607. #if FF_API_OLD_AVOPTIONS

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

  609.             continue;

  610. #endif

  611.         switch (opt->type) {

  612.             case AV_OPT_TYPE_CONST:

  613.                 /* Nothing to be done here */

  614.             break;

  615.             case AV_OPT_TYPE_FLAGS:

  616.             case AV_OPT_TYPE_INT: {

  617.                 int val;

  618.                 val = opt->default_val.dbl;

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

  620.             }

  621.             break;

  622.             case AV_OPT_TYPE_INT64:

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

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

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

  626.             break;

  627.             case AV_OPT_TYPE_DOUBLE:

  628.             case AV_OPT_TYPE_FLOAT: {

  629.                 double val;

  630.                 val = opt->default_val.dbl;

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

  632.             }

  633.             break;

  634.             case AV_OPT_TYPE_RATIONAL: {

  635.                 AVRational val;

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

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

  638.             }

  639.             break;

  640.             case AV_OPT_TYPE_STRING:

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

  642.                 break;

  643.             case AV_OPT_TYPE_BINARY:

  644.                 /* Cannot set default for binary */

  645.             break;

  646.             default:

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

  648.         }

  649.     }

  650. }

  651. 

  652. /**

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

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

  655.  *

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

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

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

  659.  * separate key from value

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

  661.  * two pairs from each other

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

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

  664.  * of error:

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

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

  667.  * cannot be set

  668.  */

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

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

  671. {

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

  673.     char *val;

  674.     int ret;

  675. 

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

  677.         (*buf)++;

  678.         val = av_get_token(buf, pairs_sep);

  679.     } else {

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

  681.         av_free(key);

  682.         return AVERROR(EINVAL);

  683.     }

  684. 

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

  686. 

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

  688.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  690. 

  691.     av_free(key);

  692.     av_free(val);

  693.     return ret;

  694. }

  695. 

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

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

  698. {

  699.     int ret, count = 0;

  700. 

  701.     if (!opts)

  702.         return 0;

  703. 

  704.     while (*opts) {

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

  706.             return ret;

  707.         count++;

  708. 

  709.         if (*opts)

  710.             opts++;

  711.     }

  712. 

  713.     return count;

  714. }

  715. 

  716. void av_opt_free(void *obj)

  717. {

  718.     const AVOption *o = NULL;

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

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

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

  722. }

  723. 

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

  725. {

  726.     AVDictionaryEntry *t = NULL;

  727.     AVDictionary    *tmp = NULL;

  728.     int ret = 0;

  729. 

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

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

  732.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  734.         else if (ret < 0) {

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

  736.             break;

  737.         }

  738.         ret = 0;

  739.     }

  740.     av_dict_free(options);

  741.     *options = tmp;

  742.     return ret;

  743. }

  744. 

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

  746.                             int opt_flags, int search_flags)

  747. {

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

  749. }

  750. 

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

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

  753. {

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

  755.     const AVOption *o = NULL;

  756. 

  757.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  758.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  759.             const AVClass *child = NULL;

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

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

  762.                     return o;

  763.         } else {

  764.             void *child = NULL;

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

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

  767.                     return o;

  768.         }

  769.     }

  770. 

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

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

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

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

  775.             if (target_obj) {

  776.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  777.                     *target_obj = obj;

  778.                 else

  779.                     *target_obj = NULL;

  780.             }

  781.             return o;

  782.         }

  783.     }

  784.     return NULL;

  785. }

  786. 

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

  788. {

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

  790.     if (c->child_next)

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

  792.     return NULL;

  793. }

  794. 

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

  796. {

  797.     if (parent->child_class_next)

  798.         return parent->child_class_next(prev);

  799.     return NULL;

  800. }

  801. 

  802. #ifdef TEST

  803. 

  804. #undef printf

  805. 

  806. typedef struct TestContext

  807. {

  808.     const AVClass *class;

  809.     int num;

  810.     int toggle;

  811.     char *string;

  812.     int flags;

  813.     AVRational rational;

  814. } TestContext;

  815. 

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

  817. 

  818. #define TEST_FLAG_COOL 01

  819. #define TEST_FLAG_LAME 02

  820. #define TEST_FLAG_MU   04

  821. 

  822. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  831. {NULL},

  832. };

  833. 

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

  835. {

  836.     return "test";

  837. }

  838. 

  839. static const AVClass test_class = {

  840.     "TestContext",

  841.     test_get_name,

  842.     test_options

  843. };

  844. 

  845. int main(void)

  846. {

  847.     int i;

  848. 

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

  850.     {

  851.         TestContext test_ctx;

  852.         const char *options[] = {

  853.             "",

  854.             ":",

  855.             "=",

  856.             "foo=:",

  857.             ":=foo",

  858.             "=foo",

  859.             "foo=",

  860.             "foo",

  861.             "foo=val",

  862.             "foo==val",

  863.             "toggle=:",

  864.             "string=:",

  865.             "toggle=1 : foo",

  866.             "toggle=100",

  867.             "toggle==1",

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

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

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

  871.             "rational=-1/0",

  872.         };

  873. 

  874.         test_ctx.class = &test_class;

  875.         av_opt_set_defaults(&test_ctx);

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

  877. 

  878.         av_log_set_level(AV_LOG_DEBUG);

  879. 

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

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

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

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

  884.             printf("\n");

  885.         }

  886.     }

  887. 

  888.     return 0;

  889. }

  890. 

  891. #endif