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

  320. {

  321.     void *target_obj;

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

  323.     uint8_t *ptr;

  324.     uint8_t **dst;

  325.     int *lendst;

  326. 

  327.     if (!o || !target_obj)

  328.         return AVERROR_OPTION_NOT_FOUND;

  329. 

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

  331.         return AVERROR(EINVAL);

  332. 

  333.     ptr = av_malloc(len);

  334.     if (!ptr)

  335.         return AVERROR(ENOMEM);

  336. 

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

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

  339. 

  340.     av_free(*dst);

  341.     *dst = ptr;

  342.     *lendst = len;

  343.     memcpy(ptr, val, len);

  344. 

  345.     return 0;

  346. }

  347. 

  348. #if FF_API_OLD_AVOPTIONS

  349. /**

  350.  *

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

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

  353.  */

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

  355. {

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

  357.     void *dst;

  358.     uint8_t *bin;

  359.     int len, i;

  360.     if (!o)

  361.         return NULL;

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

  363.         return NULL;

  364. 

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

  366.     if (o_out) *o_out= o;

  367. 

  368.     switch (o->type) {

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

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

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

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

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

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

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

  376.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  381.         break;

  382.     default: return NULL;

  383.     }

  384.     return buf;

  385. }

  386. #endif

  387. 

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

  389. {

  390.     void *dst, *target_obj;

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

  392.     uint8_t *bin, buf[128];

  393.     int len, i, ret;

  394. 

  395.     if (!o || !target_obj)

  396.         return AVERROR_OPTION_NOT_FOUND;

  397. 

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

  399. 

  400.     buf[0] = 0;

  401.     switch (o->type) {

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

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

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

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

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

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

  408.     case AV_OPT_TYPE_STRING:

  409.         if (*(uint8_t**)dst)

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

  411.         else

  412.             *out_val = av_strdup("");

  413.         return 0;

  414.     case AV_OPT_TYPE_BINARY:

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

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

  417.             return AVERROR(EINVAL);

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

  419.             return AVERROR(ENOMEM);

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

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

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

  423.         return 0;

  424.     default:

  425.         return AVERROR(EINVAL);

  426.     }

  427. 

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

  429.         return AVERROR(EINVAL);

  430.     *out_val = av_strdup(buf);

  431.     return 0;

  432. }

  433. 

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

  435.                       int search_flags)

  436. {

  437.     void *dst, *target_obj;

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

  439.     if (!o || !target_obj)

  440.         goto error;

  441. 

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

  443. 

  444.     if (o_out) *o_out= o;

  445. 

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

  447. 

  448. error:

  449.     *den=*intnum=0;

  450.     return -1;

  451. }

  452. 

  453. #if FF_API_OLD_AVOPTIONS

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

  455. {

  456.     int64_t intnum=1;

  457.     double num=1;

  458.     int den=1;

  459. 

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

  461.         return NAN;

  462.     return num*intnum/den;

  463. }

  464. 

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

  466. {

  467.     int64_t intnum=1;

  468.     double num=1;

  469.     int den=1;

  470. 

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

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

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

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

  475.     else

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

  477. }

  478. 

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

  480. {

  481.     int64_t intnum=1;

  482.     double num=1;

  483.     int den=1;

  484. 

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

  486.         return -1;

  487.     return num*intnum/den;

  488. }

  489. #endif

  490. 

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

  492. {

  493.     int64_t intnum = 1;

  494.     double     num = 1;

  495.     int   ret, den = 1;

  496. 

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

  498.         return ret;

  499.     *out_val = num*intnum/den;

  500.     return 0;

  501. }

  502. 

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

  504. {

  505.     int64_t intnum = 1;

  506.     double     num = 1;

  507.     int   ret, den = 1;

  508. 

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

  510.         return ret;

  511.     *out_val = num*intnum/den;

  512.     return 0;

  513. }

  514. 

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

  516. {

  517.     int64_t intnum = 1;

  518.     double     num = 1;

  519.     int   ret, den = 1;

  520. 

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

  522.         return ret;

  523. 

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

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

  526.     else

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

  528.     return 0;

  529. }

  530. 

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

  532. {

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

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

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

  536.     int64_t res;

  537. 

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

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

  540.         return 0;

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

  542. }

  543. 

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

  545.                      int req_flags, int rej_flags)

  546. {

  547.     const AVOption *opt=NULL;

  548. 

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

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

  551.             continue;

  552. 

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

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

  555.          * Only print items from the requested unit.

  556.          */

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

  558.             continue;

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

  560.             continue;

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

  562.             continue;

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

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

  565.         else

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

  567. 

  568.         switch (opt->type) {

  569.             case AV_OPT_TYPE_FLAGS:

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

  571.                 break;

  572.             case AV_OPT_TYPE_INT:

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

  574.                 break;

  575.             case AV_OPT_TYPE_INT64:

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

  577.                 break;

  578.             case AV_OPT_TYPE_DOUBLE:

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

  580.                 break;

  581.             case AV_OPT_TYPE_FLOAT:

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

  583.                 break;

  584.             case AV_OPT_TYPE_STRING:

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

  586.                 break;

  587.             case AV_OPT_TYPE_RATIONAL:

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

  589.                 break;

  590.             case AV_OPT_TYPE_BINARY:

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

  592.                 break;

  593.             case AV_OPT_TYPE_CONST:

  594.             default:

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

  596.                 break;

  597.         }

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

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

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

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

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

  603. 

  604.         if (opt->help)

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

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

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

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

  609.         }

  610.     }

  611. }

  612. 

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

  614. {

  615.     if (!obj)

  616.         return -1;

  617. 

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

  619. 

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

  621. 

  622.     return 0;

  623. }

  624. 

  625. void av_opt_set_defaults(void *s)

  626. {

  627. #if FF_API_OLD_AVOPTIONS

  628.     av_opt_set_defaults2(s, 0, 0);

  629. }

  630. 

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

  632. {

  633. #endif

  634.     const AVOption *opt = NULL;

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

  636. #if FF_API_OLD_AVOPTIONS

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

  638.             continue;

  639. #endif

  640.         switch (opt->type) {

  641.             case AV_OPT_TYPE_CONST:

  642.                 /* Nothing to be done here */

  643.             break;

  644.             case AV_OPT_TYPE_FLAGS:

  645.             case AV_OPT_TYPE_INT: {

  646.                 int val;

  647.                 val = opt->default_val.dbl;

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

  649.             }

  650.             break;

  651.             case AV_OPT_TYPE_INT64:

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

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

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

  655.             break;

  656.             case AV_OPT_TYPE_DOUBLE:

  657.             case AV_OPT_TYPE_FLOAT: {

  658.                 double val;

  659.                 val = opt->default_val.dbl;

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

  661.             }

  662.             break;

  663.             case AV_OPT_TYPE_RATIONAL: {

  664.                 AVRational val;

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

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

  667.             }

  668.             break;

  669.             case AV_OPT_TYPE_STRING:

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

  671.                 break;

  672.             case AV_OPT_TYPE_BINARY:

  673.                 /* Cannot set default for binary */

  674.             break;

  675.             default:

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

  677.         }

  678.     }

  679. }

  680. 

  681. /**

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

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

  684.  *

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

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

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

  688.  * separate key from value

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

  690.  * two pairs from each other

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

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

  693.  * of error:

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

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

  696.  * cannot be set

  697.  */

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

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

  700. {

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

  702.     char *val;

  703.     int ret;

  704. 

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

  706.         (*buf)++;

  707.         val = av_get_token(buf, pairs_sep);

  708.     } else {

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

  710.         av_free(key);

  711.         return AVERROR(EINVAL);

  712.     }

  713. 

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

  715. 

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

  717.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  719. 

  720.     av_free(key);

  721.     av_free(val);

  722.     return ret;

  723. }

  724. 

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

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

  727. {

  728.     int ret, count = 0;

  729. 

  730.     if (!opts)

  731.         return 0;

  732. 

  733.     while (*opts) {

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

  735.             return ret;

  736.         count++;

  737. 

  738.         if (*opts)

  739.             opts++;

  740.     }

  741. 

  742.     return count;

  743. }

  744. 

  745. void av_opt_free(void *obj)

  746. {

  747.     const AVOption *o = NULL;

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

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

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

  751. }

  752. 

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

  754. {

  755.     AVDictionaryEntry *t = NULL;

  756.     AVDictionary    *tmp = NULL;

  757.     int ret = 0;

  758. 

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

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

  761.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  763.         else if (ret < 0) {

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

  765.             break;

  766.         }

  767.         ret = 0;

  768.     }

  769.     av_dict_free(options);

  770.     *options = tmp;

  771.     return ret;

  772. }

  773. 

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

  775.                             int opt_flags, int search_flags)

  776. {

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

  778. }

  779. 

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

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

  782. {

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

  784.     const AVOption *o = NULL;

  785. 

  786.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  787.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  788.             const AVClass *child = NULL;

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

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

  791.                     return o;

  792.         } else {

  793.             void *child = NULL;

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

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

  796.                     return o;

  797.         }

  798.     }

  799. 

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

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

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

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

  804.             if (target_obj) {

  805.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  806.                     *target_obj = obj;

  807.                 else

  808.                     *target_obj = NULL;

  809.             }

  810.             return o;

  811.         }

  812.     }

  813.     return NULL;

  814. }

  815. 

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

  817. {

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

  819.     if (c->child_next)

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

  821.     return NULL;

  822. }

  823. 

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

  825. {

  826.     if (parent->child_class_next)

  827.         return parent->child_class_next(prev);

  828.     return NULL;

  829. }

  830. 

  831. #ifdef TEST

  832. 

  833. #undef printf

  834. 

  835. typedef struct TestContext

  836. {

  837.     const AVClass *class;

  838.     int num;

  839.     int toggle;

  840.     char *string;

  841.     int flags;

  842.     AVRational rational;

  843. } TestContext;

  844. 

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

  846. 

  847. #define TEST_FLAG_COOL 01

  848. #define TEST_FLAG_LAME 02

  849. #define TEST_FLAG_MU   04

  850. 

  851. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  860. {NULL},

  861. };

  862. 

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

  864. {

  865.     return "test";

  866. }

  867. 

  868. static const AVClass test_class = {

  869.     "TestContext",

  870.     test_get_name,

  871.     test_options

  872. };

  873. 

  874. int main(void)

  875. {

  876.     int i;

  877. 

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

  879.     {

  880.         TestContext test_ctx;

  881.         const char *options[] = {

  882.             "",

  883.             ":",

  884.             "=",

  885.             "foo=:",

  886.             ":=foo",

  887.             "=foo",

  888.             "foo=",

  889.             "foo",

  890.             "foo=val",

  891.             "foo==val",

  892.             "toggle=:",

  893.             "string=:",

  894.             "toggle=1 : foo",

  895.             "toggle=100",

  896.             "toggle==1",

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

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

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

  900.             "rational=-1/0",

  901.         };

  902. 

  903.         test_ctx.class = &test_class;

  904.         av_opt_set_defaults(&test_ctx);

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

  906. 

  907.         av_log_set_level(AV_LOG_DEBUG);

  908. 

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

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

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

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

  913.             printf("\n");

  914.         }

  915.     }

  916. 

  917.     return 0;

  918. }

  919. 

  920. #endif