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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",

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

  85.         return AVERROR(ERANGE);

  86.     }

  87. 

  88.     switch (o->type) {

  89.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  94.     case AV_OPT_TYPE_RATIONAL:

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

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

  97.         break;

  98.     default:

  99.         return AVERROR(EINVAL);

  100.     }

  101.     return 0;

  102. }

  103. 

  104. static const double const_values[] = {

  105.     M_PI,

  106.     M_E,

  107.     FF_QP2LAMBDA,

  108.     0

  109. };

  110. 

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

  112.     "PI",

  113.     "E",

  114.     "QP2LAMBDA",

  115.     0

  116. };

  117. 

  118. static int hexchar2int(char c) {

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

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

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

  122.     return -1;

  123. }

  124. 

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

  126. {

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

  128.     uint8_t *bin, *ptr;

  129.     int len = strlen(val);

  130. 

  131.     av_freep(dst);

  132.     *lendst = 0;

  133. 

  134.     if (len & 1)

  135.         return AVERROR(EINVAL);

  136.     len /= 2;

  137. 

  138.     ptr = bin = av_malloc(len);

  139.     while (*val) {

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

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

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

  143.             av_free(bin);

  144.             return AVERROR(EINVAL);

  145.         }

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

  147.     }

  148.     *dst = bin;

  149.     *lendst = len;

  150. 

  151.     return 0;

  152. }

  153. 

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

  155. {

  156.     av_freep(dst);

  157.     *dst = av_strdup(val);

  158.     return 0;

  159. }

  160. 

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

  162. {

  163.     int ret = 0, notfirst = 0;

  164.     for (;;) {

  165.         int i, den = 1;

  166.         char buf[256];

  167.         int cmd = 0;

  168.         double d, num = 1;

  169.         int64_t intnum = 1;

  170. 

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

  172.             cmd = *(val++);

  173. 

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

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

  176.         buf[i] = 0;

  177. 

  178.         {

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

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

  181.                 d = o_named->default_val.dbl;

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

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

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

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

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

  187.             else {

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

  189.                 if (res < 0) {

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

  191.                     return res;

  192.                 }

  193.             }

  194.         }

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

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

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

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

  199.         } else {

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

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

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

  203.         }

  204. 

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

  206.             return ret;

  207.         val += i;

  208.         if (!*val)

  209.             return 0;

  210.         notfirst = 1;

  211.     }

  212. 

  213.     return 0;

  214. }

  215. 

  216. #if FF_API_OLD_AVOPTIONS

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

  218. {

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

  220.     if (o_out)

  221.         *o_out = o;

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

  223. }

  224. #endif

  225. 

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

  227. {

  228.     void *dst, *target_obj;

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

  230.     if (!o || !target_obj)

  231.         return AVERROR_OPTION_NOT_FOUND;

  232.     if (!val)

  233.         return AVERROR(EINVAL);

  234. 

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

  236.     switch (o->type) {

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

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

  239.     case AV_OPT_TYPE_FLAGS:

  240.     case AV_OPT_TYPE_INT:

  241.     case AV_OPT_TYPE_INT64:

  242.     case AV_OPT_TYPE_FLOAT:

  243.     case AV_OPT_TYPE_DOUBLE:

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

  245.     }

  246. 

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

  248.     return AVERROR(EINVAL);

  249. }

  250. 

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

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

  253.     {\

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

  255.             return AVERROR(EINVAL);\

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

  257.     }

  258. 

  259. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  260. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  261. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  262. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  263. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  264. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  265. 

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

  267.                                   int search_flags)

  268. {

  269.     void *dst, *target_obj;

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

  271. 

  272.     if (!o || !target_obj)

  273.         return AVERROR_OPTION_NOT_FOUND;

  274. 

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

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

  277. }

  278. 

  279. #if FF_API_OLD_AVOPTIONS

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

  281. {

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

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

  284.         return NULL;

  285.     return o;

  286. }

  287. 

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

  289. {

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

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

  292.         return NULL;

  293.     return o;

  294. }

  295. 

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

  297. {

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

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

  300.         return NULL;

  301.     return o;

  302. }

  303. #endif

  304. 

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

  306. {

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

  308. }

  309. 

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

  311. {

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

  313. }

  314. 

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

  316. {

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

  318. }

  319. 

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

  321. {

  322.     void *target_obj;

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

  324.     uint8_t *ptr;

  325.     uint8_t **dst;

  326.     int *lendst;

  327. 

  328.     if (!o || !target_obj)

  329.         return AVERROR_OPTION_NOT_FOUND;

  330. 

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

  332.         return AVERROR(EINVAL);

  333. 

  334.     ptr = av_malloc(len);

  335.     if (!ptr)

  336.         return AVERROR(ENOMEM);

  337. 

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

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

  340. 

  341.     av_free(*dst);

  342.     *dst = ptr;

  343.     *lendst = len;

  344.     memcpy(ptr, val, len);

  345. 

  346.     return 0;

  347. }

  348. 

  349. #if FF_API_OLD_AVOPTIONS

  350. /**

  351.  *

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

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

  354.  */

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

  356. {

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

  358.     void *dst;

  359.     uint8_t *bin;

  360.     int len, i;

  361.     if (!o)

  362.         return NULL;

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

  364.         return NULL;

  365. 

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

  367.     if (o_out) *o_out= o;

  368. 

  369.     switch (o->type) {

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

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

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

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

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

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

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

  377.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  382.         break;

  383.     default: return NULL;

  384.     }

  385.     return buf;

  386. }

  387. #endif

  388. 

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

  390. {

  391.     void *dst, *target_obj;

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

  393.     uint8_t *bin, buf[128];

  394.     int len, i, ret;

  395. 

  396.     if (!o || !target_obj)

  397.         return AVERROR_OPTION_NOT_FOUND;

  398. 

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

  400. 

  401.     buf[0] = 0;

  402.     switch (o->type) {

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

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

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

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

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

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

  409.     case AV_OPT_TYPE_STRING:

  410.         if (*(uint8_t**)dst)

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

  412.         else

  413.             *out_val = av_strdup("");

  414.         return 0;

  415.     case AV_OPT_TYPE_BINARY:

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

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

  418.             return AVERROR(EINVAL);

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

  420.             return AVERROR(ENOMEM);

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

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

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

  424.         return 0;

  425.     default:

  426.         return AVERROR(EINVAL);

  427.     }

  428. 

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

  430.         return AVERROR(EINVAL);

  431.     *out_val = av_strdup(buf);

  432.     return 0;

  433. }

  434. 

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

  436.                       int search_flags)

  437. {

  438.     void *dst, *target_obj;

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

  440.     if (!o || !target_obj)

  441.         goto error;

  442. 

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

  444. 

  445.     if (o_out) *o_out= o;

  446. 

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

  448. 

  449. error:

  450.     *den=*intnum=0;

  451.     return -1;

  452. }

  453. 

  454. #if FF_API_OLD_AVOPTIONS

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

  456. {

  457.     int64_t intnum=1;

  458.     double num=1;

  459.     int den=1;

  460. 

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

  462.         return NAN;

  463.     return num*intnum/den;

  464. }

  465. 

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

  467. {

  468.     int64_t intnum=1;

  469.     double num=1;

  470.     int den=1;

  471. 

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

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

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

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

  476.     else

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

  478. }

  479. 

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

  481. {

  482.     int64_t intnum=1;

  483.     double num=1;

  484.     int den=1;

  485. 

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

  487.         return -1;

  488.     return num*intnum/den;

  489. }

  490. #endif

  491. 

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

  493. {

  494.     int64_t intnum = 1;

  495.     double     num = 1;

  496.     int   ret, den = 1;

  497. 

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

  499.         return ret;

  500.     *out_val = num*intnum/den;

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     int64_t intnum = 1;

  507.     double     num = 1;

  508.     int   ret, den = 1;

  509. 

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

  511.         return ret;

  512.     *out_val = num*intnum/den;

  513.     return 0;

  514. }

  515. 

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

  517. {

  518.     int64_t intnum = 1;

  519.     double     num = 1;

  520.     int   ret, den = 1;

  521. 

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

  523.         return ret;

  524. 

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

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

  527.     else

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

  529.     return 0;

  530. }

  531. 

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

  533. {

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

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

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

  537.     int64_t res;

  538. 

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

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

  541.         return 0;

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

  543. }

  544. 

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

  546.                      int req_flags, int rej_flags)

  547. {

  548.     const AVOption *opt=NULL;

  549. 

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

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

  552.             continue;

  553. 

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

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

  556.          * Only print items from the requested unit.

  557.          */

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

  559.             continue;

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

  561.             continue;

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

  563.             continue;

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

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

  566.         else

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

  568. 

  569.         switch (opt->type) {

  570.             case AV_OPT_TYPE_FLAGS:

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

  572.                 break;

  573.             case AV_OPT_TYPE_INT:

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

  575.                 break;

  576.             case AV_OPT_TYPE_INT64:

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

  578.                 break;

  579.             case AV_OPT_TYPE_DOUBLE:

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

  581.                 break;

  582.             case AV_OPT_TYPE_FLOAT:

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

  584.                 break;

  585.             case AV_OPT_TYPE_STRING:

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

  587.                 break;

  588.             case AV_OPT_TYPE_RATIONAL:

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

  590.                 break;

  591.             case AV_OPT_TYPE_BINARY:

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

  593.                 break;

  594.             case AV_OPT_TYPE_CONST:

  595.             default:

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

  597.                 break;

  598.         }

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

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

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

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

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

  604. 

  605.         if (opt->help)

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

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

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

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

  610.         }

  611.     }

  612. }

  613. 

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

  615. {

  616.     if (!obj)

  617.         return -1;

  618. 

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

  620. 

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

  622. 

  623.     return 0;

  624. }

  625. 

  626. void av_opt_set_defaults(void *s)

  627. {

  628. #if FF_API_OLD_AVOPTIONS

  629.     av_opt_set_defaults2(s, 0, 0);

  630. }

  631. 

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

  633. {

  634. #endif

  635.     const AVOption *opt = NULL;

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

  637. #if FF_API_OLD_AVOPTIONS

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

  639.             continue;

  640. #endif

  641.         switch (opt->type) {

  642.             case AV_OPT_TYPE_CONST:

  643.                 /* Nothing to be done here */

  644.             break;

  645.             case AV_OPT_TYPE_FLAGS:

  646.             case AV_OPT_TYPE_INT: {

  647.                 int val;

  648.                 val = opt->default_val.dbl;

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

  650.             }

  651.             break;

  652.             case AV_OPT_TYPE_INT64:

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

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

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

  656.             break;

  657.             case AV_OPT_TYPE_DOUBLE:

  658.             case AV_OPT_TYPE_FLOAT: {

  659.                 double val;

  660.                 val = opt->default_val.dbl;

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

  662.             }

  663.             break;

  664.             case AV_OPT_TYPE_RATIONAL: {

  665.                 AVRational val;

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

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

  668.             }

  669.             break;

  670.             case AV_OPT_TYPE_STRING:

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

  672.                 break;

  673.             case AV_OPT_TYPE_BINARY:

  674.                 /* Cannot set default for binary */

  675.             break;

  676.             default:

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

  678.         }

  679.     }

  680. }

  681. 

  682. /**

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

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

  685.  *

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

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

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

  689.  * separate key from value

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

  691.  * two pairs from each other

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

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

  694.  * of error:

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

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

  697.  * cannot be set

  698.  */

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

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

  701. {

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

  703.     char *val;

  704.     int ret;

  705. 

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

  707.         (*buf)++;

  708.         val = av_get_token(buf, pairs_sep);

  709.     } else {

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

  711.         av_free(key);

  712.         return AVERROR(EINVAL);

  713.     }

  714. 

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

  716. 

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

  718.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  720. 

  721.     av_free(key);

  722.     av_free(val);

  723.     return ret;

  724. }

  725. 

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

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

  728. {

  729.     int ret, count = 0;

  730. 

  731.     if (!opts)

  732.         return 0;

  733. 

  734.     while (*opts) {

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

  736.             return ret;

  737.         count++;

  738. 

  739.         if (*opts)

  740.             opts++;

  741.     }

  742. 

  743.     return count;

  744. }

  745. 

  746. void av_opt_free(void *obj)

  747. {

  748.     const AVOption *o = NULL;

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

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

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

  752. }

  753. 

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

  755. {

  756.     AVDictionaryEntry *t = NULL;

  757.     AVDictionary    *tmp = NULL;

  758.     int ret = 0;

  759. 

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

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

  762.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  764.         else if (ret < 0) {

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

  766.             break;

  767.         }

  768.         ret = 0;

  769.     }

  770.     av_dict_free(options);

  771.     *options = tmp;

  772.     return ret;

  773. }

  774. 

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

  776.                             int opt_flags, int search_flags)

  777. {

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

  779. }

  780. 

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

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

  783. {

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

  785.     const AVOption *o = NULL;

  786. 

  787.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  788.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  789.             const AVClass *child = NULL;

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

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

  792.                     return o;

  793.         } else {

  794.             void *child = NULL;

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

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

  797.                     return o;

  798.         }

  799.     }

  800. 

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

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

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

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

  805.             if (target_obj) {

  806.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  807.                     *target_obj = obj;

  808.                 else

  809.                     *target_obj = NULL;

  810.             }

  811.             return o;

  812.         }

  813.     }

  814.     return NULL;

  815. }

  816. 

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

  818. {

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

  820.     if (c->child_next)

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

  822.     return NULL;

  823. }

  824. 

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

  826. {

  827.     if (parent->child_class_next)

  828.         return parent->child_class_next(prev);

  829.     return NULL;

  830. }

  831. 

  832. #ifdef TEST

  833. 

  834. #undef printf

  835. 

  836. typedef struct TestContext

  837. {

  838.     const AVClass *class;

  839.     int num;

  840.     int toggle;

  841.     char *string;

  842.     int flags;

  843.     AVRational rational;

  844. } TestContext;

  845. 

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

  847. 

  848. #define TEST_FLAG_COOL 01

  849. #define TEST_FLAG_LAME 02

  850. #define TEST_FLAG_MU   04

  851. 

  852. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  861. {NULL},

  862. };

  863. 

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

  865. {

  866.     return "test";

  867. }

  868. 

  869. static const AVClass test_class = {

  870.     "TestContext",

  871.     test_get_name,

  872.     test_options

  873. };

  874. 

  875. int main(void)

  876. {

  877.     int i;

  878. 

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

  880.     {

  881.         TestContext test_ctx;

  882.         const char *options[] = {

  883.             "",

  884.             ":",

  885.             "=",

  886.             "foo=:",

  887.             ":=foo",

  888.             "=foo",

  889.             "foo=",

  890.             "foo",

  891.             "foo=val",

  892.             "foo==val",

  893.             "toggle=:",

  894.             "string=:",

  895.             "toggle=1 : foo",

  896.             "toggle=100",

  897.             "toggle==1",

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

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

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

  901.             "rational=-1/0",

  902.         };

  903. 

  904.         test_ctx.class = &test_class;

  905.         av_opt_set_defaults(&test_ctx);

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

  907. 

  908.         av_log_set_level(AV_LOG_DEBUG);

  909. 

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

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

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

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

  914.             printf("\n");

  915.         }

  916.     }

  917. 

  918.     return 0;

  919. }

  920. 

  921. #endif