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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 "common.h"

  31. #include "opt.h"

  32. #include "eval.h"

  33. #include "dict.h"

  34. #include "log.h"

  35. #include "mathematics.h"

  36. 

  37. #if FF_API_FIND_OPT

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

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

  40. {

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

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

  43. 

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

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

  46.             return o;

  47.     }

  48.     return NULL;

  49. }

  50. #endif

  51. 

  52. #if FF_API_OLD_AVOPTIONS

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

  54. {

  55.     return av_opt_next(obj, last);

  56. }

  57. #endif

  58. 

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

  60. {

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

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

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

  64.     return NULL;

  65. }

  66. 

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

  68. {

  69.     switch (o->type) {

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

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

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

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

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

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

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

  77.                                                         return 0;

  78.     }

  79.     return AVERROR(EINVAL);

  80. }

  81. 

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

  83. {

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

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

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

  87.         return AVERROR(ERANGE);

  88.     }

  89. 

  90.     switch (o->type) {

  91.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  96.     case AV_OPT_TYPE_RATIONAL:

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

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

  99.         break;

  100.     default:

  101.         return AVERROR(EINVAL);

  102.     }

  103.     return 0;

  104. }

  105. 

  106. static const double const_values[] = {

  107.     M_PI,

  108.     M_E,

  109.     FF_QP2LAMBDA,

  110.     0

  111. };

  112. 

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

  114.     "PI",

  115.     "E",

  116.     "QP2LAMBDA",

  117.     0

  118. };

  119. 

  120. static int hexchar2int(char c) {

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

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

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

  124.     return -1;

  125. }

  126. 

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

  128. {

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

  130.     uint8_t *bin, *ptr;

  131.     int len = strlen(val);

  132. 

  133.     av_freep(dst);

  134.     *lendst = 0;

  135. 

  136.     if (len & 1)

  137.         return AVERROR(EINVAL);

  138.     len /= 2;

  139. 

  140.     ptr = bin = av_malloc(len);

  141.     while (*val) {

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

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

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

  145.             av_free(bin);

  146.             return AVERROR(EINVAL);

  147.         }

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

  149.     }

  150.     *dst = bin;

  151.     *lendst = len;

  152. 

  153.     return 0;

  154. }

  155. 

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

  157. {

  158.     av_freep(dst);

  159.     *dst = av_strdup(val);

  160.     return 0;

  161. }

  162. 

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

  164. {

  165.     int ret = 0, notfirst = 0;

  166.     for (;;) {

  167.         int i, den = 1;

  168.         char buf[256];

  169.         int cmd = 0;

  170.         double d, num = 1;

  171.         int64_t intnum = 1;

  172. 

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

  174.             cmd = *(val++);

  175. 

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

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

  178.         buf[i] = 0;

  179. 

  180.         {

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

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

  183.                 d = o_named->default_val.dbl;

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

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

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

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

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

  189.             else {

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

  191.                 if (res < 0) {

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

  193.                     return res;

  194.                 }

  195.             }

  196.         }

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

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

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

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

  201.         } else {

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

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

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

  205.         }

  206. 

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

  208.             return ret;

  209.         val += i;

  210.         if (!*val)

  211.             return 0;

  212.         notfirst = 1;

  213.     }

  214. 

  215.     return 0;

  216. }

  217. 

  218. #if FF_API_OLD_AVOPTIONS

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

  220. {

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

  222.     if (o_out)

  223.         *o_out = o;

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

  225. }

  226. #endif

  227. 

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

  229. {

  230.     void *dst, *target_obj;

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

  232.     if (!o || !target_obj)

  233.         return AVERROR_OPTION_NOT_FOUND;

  234.     if (!val)

  235.         return AVERROR(EINVAL);

  236. 

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

  238.     switch (o->type) {

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

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

  241.     case AV_OPT_TYPE_FLAGS:

  242.     case AV_OPT_TYPE_INT:

  243.     case AV_OPT_TYPE_INT64:

  244.     case AV_OPT_TYPE_FLOAT:

  245.     case AV_OPT_TYPE_DOUBLE:

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

  247.     }

  248. 

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

  250.     return AVERROR(EINVAL);

  251. }

  252. 

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

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

  255.     {\

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

  257.             return AVERROR(EINVAL);\

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

  259.     }

  260. 

  261. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  262. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  263. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  264. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  265. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  266. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  267. 

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

  269.                                   int search_flags)

  270. {

  271.     void *dst, *target_obj;

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

  273. 

  274.     if (!o || !target_obj)

  275.         return AVERROR_OPTION_NOT_FOUND;

  276. 

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

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

  279. }

  280. 

  281. #if FF_API_OLD_AVOPTIONS

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

  283. {

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

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

  286.         return NULL;

  287.     return o;

  288. }

  289. 

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

  291. {

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

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

  294.         return NULL;

  295.     return o;

  296. }

  297. 

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

  299. {

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

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

  302.         return NULL;

  303.     return o;

  304. }

  305. #endif

  306. 

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

  308. {

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

  310. }

  311. 

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

  313. {

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

  315. }

  316. 

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

  318. {

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

  320. }

  321. 

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

  323. {

  324.     void *target_obj;

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

  326.     uint8_t *ptr;

  327.     uint8_t **dst;

  328.     int *lendst;

  329. 

  330.     if (!o || !target_obj)

  331.         return AVERROR_OPTION_NOT_FOUND;

  332. 

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

  334.         return AVERROR(EINVAL);

  335. 

  336.     ptr = av_malloc(len);

  337.     if (!ptr)

  338.         return AVERROR(ENOMEM);

  339. 

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

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

  342. 

  343.     av_free(*dst);

  344.     *dst = ptr;

  345.     *lendst = len;

  346.     memcpy(ptr, val, len);

  347. 

  348.     return 0;

  349. }

  350. 

  351. #if FF_API_OLD_AVOPTIONS

  352. /**

  353.  *

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

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

  356.  */

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

  358. {

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

  360.     void *dst;

  361.     uint8_t *bin;

  362.     int len, i;

  363.     if (!o)

  364.         return NULL;

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

  366.         return NULL;

  367. 

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

  369.     if (o_out) *o_out= o;

  370. 

  371.     switch (o->type) {

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

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

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

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

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

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

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

  379.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  384.         break;

  385.     default: return NULL;

  386.     }

  387.     return buf;

  388. }

  389. #endif

  390. 

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

  392. {

  393.     void *dst, *target_obj;

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

  395.     uint8_t *bin, buf[128];

  396.     int len, i, ret;

  397. 

  398.     if (!o || !target_obj)

  399.         return AVERROR_OPTION_NOT_FOUND;

  400. 

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

  402. 

  403.     buf[0] = 0;

  404.     switch (o->type) {

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

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

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

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

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

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

  411.     case AV_OPT_TYPE_STRING:

  412.         if (*(uint8_t**)dst)

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

  414.         else

  415.             *out_val = av_strdup("");

  416.         return 0;

  417.     case AV_OPT_TYPE_BINARY:

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

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

  420.             return AVERROR(EINVAL);

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

  422.             return AVERROR(ENOMEM);

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

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

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

  426.         return 0;

  427.     default:

  428.         return AVERROR(EINVAL);

  429.     }

  430. 

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

  432.         return AVERROR(EINVAL);

  433.     *out_val = av_strdup(buf);

  434.     return 0;

  435. }

  436. 

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

  438.                       int search_flags)

  439. {

  440.     void *dst, *target_obj;

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

  442.     if (!o || !target_obj)

  443.         goto error;

  444. 

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

  446. 

  447.     if (o_out) *o_out= o;

  448. 

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

  450. 

  451. error:

  452.     *den=*intnum=0;

  453.     return -1;

  454. }

  455. 

  456. #if FF_API_OLD_AVOPTIONS

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

  458. {

  459.     int64_t intnum=1;

  460.     double num=1;

  461.     int den=1;

  462. 

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

  464.         return NAN;

  465.     return num*intnum/den;

  466. }

  467. 

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

  469. {

  470.     int64_t intnum=1;

  471.     double num=1;

  472.     int den=1;

  473. 

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

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

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

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

  478.     else

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

  480. }

  481. 

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

  483. {

  484.     int64_t intnum=1;

  485.     double num=1;

  486.     int den=1;

  487. 

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

  489.         return -1;

  490.     return num*intnum/den;

  491. }

  492. #endif

  493. 

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

  495. {

  496.     int64_t intnum = 1;

  497.     double     num = 1;

  498.     int   ret, den = 1;

  499. 

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

  501.         return ret;

  502.     *out_val = num*intnum/den;

  503.     return 0;

  504. }

  505. 

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

  507. {

  508.     int64_t intnum = 1;

  509.     double     num = 1;

  510.     int   ret, den = 1;

  511. 

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

  513.         return ret;

  514.     *out_val = num*intnum/den;

  515.     return 0;

  516. }

  517. 

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

  519. {

  520.     int64_t intnum = 1;

  521.     double     num = 1;

  522.     int   ret, den = 1;

  523. 

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

  525.         return ret;

  526. 

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

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

  529.     else

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

  531.     return 0;

  532. }

  533. 

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

  535. {

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

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

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

  539.     int64_t res;

  540. 

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

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

  543.         return 0;

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

  545. }

  546. 

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

  548.                      int req_flags, int rej_flags)

  549. {

  550.     const AVOption *opt=NULL;

  551. 

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

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

  554.             continue;

  555. 

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

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

  558.          * Only print items from the requested unit.

  559.          */

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

  561.             continue;

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

  563.             continue;

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

  565.             continue;

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

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

  568.         else

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

  570. 

  571.         switch (opt->type) {

  572.             case AV_OPT_TYPE_FLAGS:

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

  574.                 break;

  575.             case AV_OPT_TYPE_INT:

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

  577.                 break;

  578.             case AV_OPT_TYPE_INT64:

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

  580.                 break;

  581.             case AV_OPT_TYPE_DOUBLE:

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

  583.                 break;

  584.             case AV_OPT_TYPE_FLOAT:

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

  586.                 break;

  587.             case AV_OPT_TYPE_STRING:

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

  589.                 break;

  590.             case AV_OPT_TYPE_RATIONAL:

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

  592.                 break;

  593.             case AV_OPT_TYPE_BINARY:

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

  595.                 break;

  596.             case AV_OPT_TYPE_CONST:

  597.             default:

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

  599.                 break;

  600.         }

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

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

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

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

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

  606. 

  607.         if (opt->help)

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

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

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

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

  612.         }

  613.     }

  614. }

  615. 

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

  617. {

  618.     if (!obj)

  619.         return -1;

  620. 

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

  622. 

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

  624. 

  625.     return 0;

  626. }

  627. 

  628. void av_opt_set_defaults(void *s)

  629. {

  630. #if FF_API_OLD_AVOPTIONS

  631.     av_opt_set_defaults2(s, 0, 0);

  632. }

  633. 

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

  635. {

  636. #endif

  637.     const AVOption *opt = NULL;

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

  639. #if FF_API_OLD_AVOPTIONS

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

  641.             continue;

  642. #endif

  643.         switch (opt->type) {

  644.             case AV_OPT_TYPE_CONST:

  645.                 /* Nothing to be done here */

  646.             break;

  647.             case AV_OPT_TYPE_FLAGS:

  648.             case AV_OPT_TYPE_INT: {

  649.                 int val;

  650.                 val = opt->default_val.dbl;

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

  652.             }

  653.             break;

  654.             case AV_OPT_TYPE_INT64:

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

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

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

  658.             break;

  659.             case AV_OPT_TYPE_DOUBLE:

  660.             case AV_OPT_TYPE_FLOAT: {

  661.                 double val;

  662.                 val = opt->default_val.dbl;

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

  664.             }

  665.             break;

  666.             case AV_OPT_TYPE_RATIONAL: {

  667.                 AVRational val;

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

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

  670.             }

  671.             break;

  672.             case AV_OPT_TYPE_STRING:

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

  674.                 break;

  675.             case AV_OPT_TYPE_BINARY:

  676.                 /* Cannot set default for binary */

  677.             break;

  678.             default:

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

  680.         }

  681.     }

  682. }

  683. 

  684. /**

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

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

  687.  *

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

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

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

  691.  * separate key from value

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

  693.  * two pairs from each other

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

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

  696.  * of error:

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

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

  699.  * cannot be set

  700.  */

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

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

  703. {

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

  705.     char *val;

  706.     int ret;

  707. 

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

  709.         (*buf)++;

  710.         val = av_get_token(buf, pairs_sep);

  711.     } else {

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

  713.         av_free(key);

  714.         return AVERROR(EINVAL);

  715.     }

  716. 

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

  718. 

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

  720.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  722. 

  723.     av_free(key);

  724.     av_free(val);

  725.     return ret;

  726. }

  727. 

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

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

  730. {

  731.     int ret, count = 0;

  732. 

  733.     if (!opts)

  734.         return 0;

  735. 

  736.     while (*opts) {

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

  738.             return ret;

  739.         count++;

  740. 

  741.         if (*opts)

  742.             opts++;

  743.     }

  744. 

  745.     return count;

  746. }

  747. 

  748. void av_opt_free(void *obj)

  749. {

  750.     const AVOption *o = NULL;

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

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

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

  754. }

  755. 

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

  757. {

  758.     AVDictionaryEntry *t = NULL;

  759.     AVDictionary    *tmp = NULL;

  760.     int ret = 0;

  761. 

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

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

  764.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  766.         else if (ret < 0) {

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

  768.             break;

  769.         }

  770.         ret = 0;

  771.     }

  772.     av_dict_free(options);

  773.     *options = tmp;

  774.     return ret;

  775. }

  776. 

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

  778.                             int opt_flags, int search_flags)

  779. {

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

  781. }

  782. 

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

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

  785. {

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

  787.     const AVOption *o = NULL;

  788. 

  789.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  790.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  791.             const AVClass *child = NULL;

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

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

  794.                     return o;

  795.         } else {

  796.             void *child = NULL;

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

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

  799.                     return o;

  800.         }

  801.     }

  802. 

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

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

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

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

  807.             if (target_obj) {

  808.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  809.                     *target_obj = obj;

  810.                 else

  811.                     *target_obj = NULL;

  812.             }

  813.             return o;

  814.         }

  815.     }

  816.     return NULL;

  817. }

  818. 

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

  820. {

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

  822.     if (c->child_next)

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

  824.     return NULL;

  825. }

  826. 

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

  828. {

  829.     if (parent->child_class_next)

  830.         return parent->child_class_next(prev);

  831.     return NULL;

  832. }

  833. 

  834. #ifdef TEST

  835. 

  836. #undef printf

  837. 

  838. typedef struct TestContext

  839. {

  840.     const AVClass *class;

  841.     int num;

  842.     int toggle;

  843.     char *string;

  844.     int flags;

  845.     AVRational rational;

  846. } TestContext;

  847. 

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

  849. 

  850. #define TEST_FLAG_COOL 01

  851. #define TEST_FLAG_LAME 02

  852. #define TEST_FLAG_MU   04

  853. 

  854. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  863. {NULL},

  864. };

  865. 

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

  867. {

  868.     return "test";

  869. }

  870. 

  871. static const AVClass test_class = {

  872.     "TestContext",

  873.     test_get_name,

  874.     test_options

  875. };

  876. 

  877. int main(void)

  878. {

  879.     int i;

  880. 

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

  882.     {

  883.         TestContext test_ctx;

  884.         const char *options[] = {

  885.             "",

  886.             ":",

  887.             "=",

  888.             "foo=:",

  889.             ":=foo",

  890.             "=foo",

  891.             "foo=",

  892.             "foo",

  893.             "foo=val",

  894.             "foo==val",

  895.             "toggle=:",

  896.             "string=:",

  897.             "toggle=1 : foo",

  898.             "toggle=100",

  899.             "toggle==1",

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

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

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

  903.             "rational=-1/0",

  904.         };

  905. 

  906.         test_ctx.class = &test_class;

  907.         av_opt_set_defaults(&test_ctx);

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

  909. 

  910.         av_log_set_level(AV_LOG_DEBUG);

  911. 

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

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

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

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

  916.             printf("\n");

  917.         }

  918.     }

  919. 

  920.     return 0;

  921. }

  922. 

  923. #endif