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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. #include "mathematics.h"

  35. 

  36. #if FF_API_FIND_OPT

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

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

  39. {

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

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

  42. 

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

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

  45.             return o;

  46.     }

  47.     return NULL;

  48. }

  49. #endif

  50. 

  51. #if FF_API_OLD_AVOPTIONS

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

  53. {

  54.     return av_opt_next(obj, last);

  55. }

  56. #endif

  57. 

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

  59. {

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

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

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

  63.     return NULL;

  64. }

  65. 

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

  67. {

  68.     switch (o->type) {

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

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

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

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

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

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

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

  76.                                                         return 0;

  77.     }

  78.     return AVERROR(EINVAL);

  79. }

  80. 

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

  82. {

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

  84.         av_log(obj, AV_LOG_ERROR, "Value %lf for parameter '%s' out of range\n",

  85.                num*intnum/den, o->name);

  86.         return AVERROR(ERANGE);

  87.     }

  88. 

  89.     switch (o->type) {

  90.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  95.     case AV_OPT_TYPE_RATIONAL:

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

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

  98.         break;

  99.     default:

  100.         return AVERROR(EINVAL);

  101.     }

  102.     return 0;

  103. }

  104. 

  105. static const double const_values[] = {

  106.     M_PI,

  107.     M_E,

  108.     FF_QP2LAMBDA,

  109.     0

  110. };

  111. 

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

  113.     "PI",

  114.     "E",

  115.     "QP2LAMBDA",

  116.     0

  117. };

  118. 

  119. static int hexchar2int(char c) {

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

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

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

  123.     return -1;

  124. }

  125. 

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

  127. {

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

  129.     uint8_t *bin, *ptr;

  130.     int len = strlen(val);

  131. 

  132.     av_freep(dst);

  133.     *lendst = 0;

  134. 

  135.     if (len & 1)

  136.         return AVERROR(EINVAL);

  137.     len /= 2;

  138. 

  139.     ptr = bin = av_malloc(len);

  140.     while (*val) {

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

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

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

  144.             av_free(bin);

  145.             return AVERROR(EINVAL);

  146.         }

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

  148.     }

  149.     *dst = bin;

  150.     *lendst = len;

  151. 

  152.     return 0;

  153. }

  154. 

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

  156. {

  157.     av_freep(dst);

  158.     *dst = av_strdup(val);

  159.     return 0;

  160. }

  161. 

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

  163. {

  164.     int ret = 0, notfirst = 0;

  165.     for (;;) {

  166.         int i, den = 1;

  167.         char buf[256];

  168.         int cmd = 0;

  169.         double d, num = 1;

  170.         int64_t intnum = 1;

  171. 

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

  173.             cmd = *(val++);

  174. 

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

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

  177.         buf[i] = 0;

  178. 

  179.         {

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

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

  182.                 d = o_named->default_val.dbl;

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

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

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

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

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

  188.             else {

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

  190.                 if (res < 0) {

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

  192.                     return res;

  193.                 }

  194.             }

  195.         }

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

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

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

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

  200.         } else {

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

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

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

  204.         }

  205. 

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

  207.             return ret;

  208.         val += i;

  209.         if (!*val)

  210.             return 0;

  211.         notfirst = 1;

  212.     }

  213. 

  214.     return 0;

  215. }

  216. 

  217. #if FF_API_OLD_AVOPTIONS

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

  219. {

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

  221.     if (o_out)

  222.         *o_out = o;

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

  224. }

  225. #endif

  226. 

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

  228. {

  229.     void *dst, *target_obj;

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

  231.     if (!o || !target_obj)

  232.         return AVERROR_OPTION_NOT_FOUND;

  233.     if (!val)

  234.         return AVERROR(EINVAL);

  235. 

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

  237.     switch (o->type) {

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

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

  240.     case AV_OPT_TYPE_FLAGS:

  241.     case AV_OPT_TYPE_INT:

  242.     case AV_OPT_TYPE_INT64:

  243.     case AV_OPT_TYPE_FLOAT:

  244.     case AV_OPT_TYPE_DOUBLE:

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

  246.     }

  247. 

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

  249.     return AVERROR(EINVAL);

  250. }

  251. 

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

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

  254.     {\

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

  256.             return AVERROR(EINVAL);\

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

  258.     }

  259. 

  260. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  261. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  262. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  263. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  264. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  265. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  266. 

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

  268.                                   int search_flags)

  269. {

  270.     void *dst, *target_obj;

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

  272. 

  273.     if (!o || !target_obj)

  274.         return AVERROR_OPTION_NOT_FOUND;

  275. 

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

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

  278. }

  279. 

  280. #if FF_API_OLD_AVOPTIONS

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

  282. {

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

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

  285.         return NULL;

  286.     return o;

  287. }

  288. 

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

  290. {

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

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

  293.         return NULL;

  294.     return o;

  295. }

  296. 

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

  298. {

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

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

  301.         return NULL;

  302.     return o;

  303. }

  304. #endif

  305. 

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

  307. {

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

  309. }

  310. 

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

  312. {

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

  314. }

  315. 

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

  317. {

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

  319. }

  320. 

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

  322. {

  323.     void *target_obj;

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

  325.     uint8_t *ptr;

  326.     uint8_t **dst;

  327.     int *lendst;

  328. 

  329.     if (!o || !target_obj)

  330.         return AVERROR_OPTION_NOT_FOUND;

  331. 

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

  333.         return AVERROR(EINVAL);

  334. 

  335.     ptr = av_malloc(len);

  336.     if (!ptr)

  337.         return AVERROR(ENOMEM);

  338. 

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

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

  341. 

  342.     av_free(*dst);

  343.     *dst = ptr;

  344.     *lendst = len;

  345.     memcpy(ptr, val, len);

  346. 

  347.     return 0;

  348. }

  349. 

  350. #if FF_API_OLD_AVOPTIONS

  351. /**

  352.  *

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

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

  355.  */

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

  357. {

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

  359.     void *dst;

  360.     uint8_t *bin;

  361.     int len, i;

  362.     if (!o)

  363.         return NULL;

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

  365.         return NULL;

  366. 

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

  368.     if (o_out) *o_out= o;

  369. 

  370.     switch (o->type) {

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

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

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

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

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

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

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

  378.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  383.         break;

  384.     default: return NULL;

  385.     }

  386.     return buf;

  387. }

  388. #endif

  389. 

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

  391. {

  392.     void *dst, *target_obj;

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

  394.     uint8_t *bin, buf[128];

  395.     int len, i, ret;

  396. 

  397.     if (!o || !target_obj)

  398.         return AVERROR_OPTION_NOT_FOUND;

  399. 

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

  401. 

  402.     buf[0] = 0;

  403.     switch (o->type) {

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

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

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

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

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

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

  410.     case AV_OPT_TYPE_STRING:

  411.         if (*(uint8_t**)dst)

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

  413.         else

  414.             *out_val = av_strdup("");

  415.         return 0;

  416.     case AV_OPT_TYPE_BINARY:

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

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

  419.             return AVERROR(EINVAL);

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

  421.             return AVERROR(ENOMEM);

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

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

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

  425.         return 0;

  426.     default:

  427.         return AVERROR(EINVAL);

  428.     }

  429. 

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

  431.         return AVERROR(EINVAL);

  432.     *out_val = av_strdup(buf);

  433.     return 0;

  434. }

  435. 

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

  437.                       int search_flags)

  438. {

  439.     void *dst, *target_obj;

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

  441.     if (!o || !target_obj)

  442.         goto error;

  443. 

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

  445. 

  446.     if (o_out) *o_out= o;

  447. 

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

  449. 

  450. error:

  451.     *den=*intnum=0;

  452.     return -1;

  453. }

  454. 

  455. #if FF_API_OLD_AVOPTIONS

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

  457. {

  458.     int64_t intnum=1;

  459.     double num=1;

  460.     int den=1;

  461. 

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

  463.         return NAN;

  464.     return num*intnum/den;

  465. }

  466. 

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

  468. {

  469.     int64_t intnum=1;

  470.     double num=1;

  471.     int den=1;

  472. 

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

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

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

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

  477.     else

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

  479. }

  480. 

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

  482. {

  483.     int64_t intnum=1;

  484.     double num=1;

  485.     int den=1;

  486. 

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

  488.         return -1;

  489.     return num*intnum/den;

  490. }

  491. #endif

  492. 

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

  494. {

  495.     int64_t intnum = 1;

  496.     double     num = 1;

  497.     int   ret, den = 1;

  498. 

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

  500.         return ret;

  501.     *out_val = num*intnum/den;

  502.     return 0;

  503. }

  504. 

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

  506. {

  507.     int64_t intnum = 1;

  508.     double     num = 1;

  509.     int   ret, den = 1;

  510. 

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

  512.         return ret;

  513.     *out_val = num*intnum/den;

  514.     return 0;

  515. }

  516. 

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

  518. {

  519.     int64_t intnum = 1;

  520.     double     num = 1;

  521.     int   ret, den = 1;

  522. 

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

  524.         return ret;

  525. 

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

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

  528.     else

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

  530.     return 0;

  531. }

  532. 

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

  534. {

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

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

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

  538.     int64_t res;

  539. 

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

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

  542.         return 0;

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

  544. }

  545. 

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

  547.                      int req_flags, int rej_flags)

  548. {

  549.     const AVOption *opt=NULL;

  550. 

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

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

  553.             continue;

  554. 

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

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

  557.          * Only print items from the requested unit.

  558.          */

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

  560.             continue;

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

  562.             continue;

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

  564.             continue;

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

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

  567.         else

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

  569. 

  570.         switch (opt->type) {

  571.             case AV_OPT_TYPE_FLAGS:

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

  573.                 break;

  574.             case AV_OPT_TYPE_INT:

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

  576.                 break;

  577.             case AV_OPT_TYPE_INT64:

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

  579.                 break;

  580.             case AV_OPT_TYPE_DOUBLE:

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

  582.                 break;

  583.             case AV_OPT_TYPE_FLOAT:

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

  585.                 break;

  586.             case AV_OPT_TYPE_STRING:

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

  588.                 break;

  589.             case AV_OPT_TYPE_RATIONAL:

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

  591.                 break;

  592.             case AV_OPT_TYPE_BINARY:

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

  594.                 break;

  595.             case AV_OPT_TYPE_CONST:

  596.             default:

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

  598.                 break;

  599.         }

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

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

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

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

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

  605. 

  606.         if (opt->help)

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

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

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

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

  611.         }

  612.     }

  613. }

  614. 

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

  616. {

  617.     if (!obj)

  618.         return -1;

  619. 

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

  621. 

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

  623. 

  624.     return 0;

  625. }

  626. 

  627. void av_opt_set_defaults(void *s)

  628. {

  629. #if FF_API_OLD_AVOPTIONS

  630.     av_opt_set_defaults2(s, 0, 0);

  631. }

  632. 

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

  634. {

  635. #endif

  636.     const AVOption *opt = NULL;

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

  638. #if FF_API_OLD_AVOPTIONS

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

  640.             continue;

  641. #endif

  642.         switch (opt->type) {

  643.             case AV_OPT_TYPE_CONST:

  644.                 /* Nothing to be done here */

  645.             break;

  646.             case AV_OPT_TYPE_FLAGS:

  647.             case AV_OPT_TYPE_INT: {

  648.                 int val;

  649.                 val = opt->default_val.dbl;

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

  651.             }

  652.             break;

  653.             case AV_OPT_TYPE_INT64:

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

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

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

  657.             break;

  658.             case AV_OPT_TYPE_DOUBLE:

  659.             case AV_OPT_TYPE_FLOAT: {

  660.                 double val;

  661.                 val = opt->default_val.dbl;

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

  663.             }

  664.             break;

  665.             case AV_OPT_TYPE_RATIONAL: {

  666.                 AVRational val;

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

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

  669.             }

  670.             break;

  671.             case AV_OPT_TYPE_STRING:

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

  673.                 break;

  674.             case AV_OPT_TYPE_BINARY:

  675.                 /* Cannot set default for binary */

  676.             break;

  677.             default:

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

  679.         }

  680.     }

  681. }

  682. 

  683. /**

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

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

  686.  *

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

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

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

  690.  * separate key from value

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

  692.  * two pairs from each other

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

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

  695.  * of error:

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

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

  698.  * cannot be set

  699.  */

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

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

  702. {

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

  704.     char *val;

  705.     int ret;

  706. 

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

  708.         (*buf)++;

  709.         val = av_get_token(buf, pairs_sep);

  710.     } else {

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

  712.         av_free(key);

  713.         return AVERROR(EINVAL);

  714.     }

  715. 

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

  717. 

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

  719.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  721. 

  722.     av_free(key);

  723.     av_free(val);

  724.     return ret;

  725. }

  726. 

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

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

  729. {

  730.     int ret, count = 0;

  731. 

  732.     if (!opts)

  733.         return 0;

  734. 

  735.     while (*opts) {

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

  737.             return ret;

  738.         count++;

  739. 

  740.         if (*opts)

  741.             opts++;

  742.     }

  743. 

  744.     return count;

  745. }

  746. 

  747. void av_opt_free(void *obj)

  748. {

  749.     const AVOption *o = NULL;

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

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

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

  753. }

  754. 

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

  756. {

  757.     AVDictionaryEntry *t = NULL;

  758.     AVDictionary    *tmp = NULL;

  759.     int ret = 0;

  760. 

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

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

  763.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  765.         else if (ret < 0) {

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

  767.             break;

  768.         }

  769.         ret = 0;

  770.     }

  771.     av_dict_free(options);

  772.     *options = tmp;

  773.     return ret;

  774. }

  775. 

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

  777.                             int opt_flags, int search_flags)

  778. {

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

  780. }

  781. 

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

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

  784. {

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

  786.     const AVOption *o = NULL;

  787. 

  788.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  789.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  790.             const AVClass *child = NULL;

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

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

  793.                     return o;

  794.         } else {

  795.             void *child = NULL;

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

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

  798.                     return o;

  799.         }

  800.     }

  801. 

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

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

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

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

  806.             if (target_obj) {

  807.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  808.                     *target_obj = obj;

  809.                 else

  810.                     *target_obj = NULL;

  811.             }

  812.             return o;

  813.         }

  814.     }

  815.     return NULL;

  816. }

  817. 

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

  819. {

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

  821.     if (c->child_next)

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

  823.     return NULL;

  824. }

  825. 

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

  827. {

  828.     if (parent->child_class_next)

  829.         return parent->child_class_next(prev);

  830.     return NULL;

  831. }

  832. 

  833. #ifdef TEST

  834. 

  835. #undef printf

  836. 

  837. typedef struct TestContext

  838. {

  839.     const AVClass *class;

  840.     int num;

  841.     int toggle;

  842.     char *string;

  843.     int flags;

  844.     AVRational rational;

  845. } TestContext;

  846. 

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

  848. 

  849. #define TEST_FLAG_COOL 01

  850. #define TEST_FLAG_LAME 02

  851. #define TEST_FLAG_MU   04

  852. 

  853. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  862. {NULL},

  863. };

  864. 

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

  866. {

  867.     return "test";

  868. }

  869. 

  870. static const AVClass test_class = {

  871.     "TestContext",

  872.     test_get_name,

  873.     test_options

  874. };

  875. 

  876. int main(void)

  877. {

  878.     int i;

  879. 

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

  881.     {

  882.         TestContext test_ctx;

  883.         const char *options[] = {

  884.             "",

  885.             ":",

  886.             "=",

  887.             "foo=:",

  888.             ":=foo",

  889.             "=foo",

  890.             "foo=",

  891.             "foo",

  892.             "foo=val",

  893.             "foo==val",

  894.             "toggle=:",

  895.             "string=:",

  896.             "toggle=1 : foo",

  897.             "toggle=100",

  898.             "toggle==1",

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

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

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

  902.             "rational=-1/0",

  903.         };

  904. 

  905.         test_ctx.class = &test_class;

  906.         av_opt_set_defaults(&test_ctx);

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

  908. 

  909.         av_log_set_level(AV_LOG_DEBUG);

  910. 

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

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

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

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

  915.             printf("\n");

  916.         }

  917.     }

  918. 

  919.     return 0;

  920. }

  921. 

  922. #endif