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

  38. {

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

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

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

  42.     return NULL;

  43. }

  44. 

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

  46. {

  47.     switch (o->type) {

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

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

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

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

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

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

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

  55.                                                         return 0;

  56.     }

  57.     return AVERROR(EINVAL);

  58. }

  59. 

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

  61. {

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

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

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

  65.         return AVERROR(ERANGE);

  66.     }

  67. 

  68.     switch (o->type) {

  69.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  74.     case AV_OPT_TYPE_RATIONAL:

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

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

  77.         break;

  78.     default:

  79.         return AVERROR(EINVAL);

  80.     }

  81.     return 0;

  82. }

  83. 

  84. static const double const_values[] = {

  85.     M_PI,

  86.     M_E,

  87.     FF_QP2LAMBDA,

  88.     0

  89. };

  90. 

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

  92.     "PI",

  93.     "E",

  94.     "QP2LAMBDA",

  95.     0

  96. };

  97. 

  98. static int hexchar2int(char c) {

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

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

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

  102.     return -1;

  103. }

  104. 

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

  106. {

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

  108.     uint8_t *bin, *ptr;

  109.     int len = strlen(val);

  110. 

  111.     av_freep(dst);

  112.     *lendst = 0;

  113. 

  114.     if (len & 1)

  115.         return AVERROR(EINVAL);

  116.     len /= 2;

  117. 

  118.     ptr = bin = av_malloc(len);

  119.     while (*val) {

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

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

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

  123.             av_free(bin);

  124.             return AVERROR(EINVAL);

  125.         }

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

  127.     }

  128.     *dst = bin;

  129.     *lendst = len;

  130. 

  131.     return 0;

  132. }

  133. 

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

  135. {

  136.     av_freep(dst);

  137.     *dst = av_strdup(val);

  138.     return 0;

  139. }

  140. 

  141. #define DEFAULT_NUMVAL(opt) ((opt->type == AV_OPT_TYPE_INT64 || \

  142.                               opt->type == AV_OPT_TYPE_CONST || \

  143.                               opt->type == AV_OPT_TYPE_FLAGS || \

  144.                               opt->type == AV_OPT_TYPE_INT) ? \

  145.                              opt->default_val.i64 : opt->default_val.dbl)

  146. 

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

  148. {

  149.     int ret = 0, notfirst = 0;

  150.     for (;;) {

  151.         int i, den = 1;

  152.         char buf[256];

  153.         int cmd = 0;

  154.         double d, num = 1;

  155.         int64_t intnum = 1;

  156. 

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

  158.             cmd = *(val++);

  159. 

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

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

  162.         buf[i] = 0;

  163. 

  164.         {

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

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

  167.                 d = DEFAULT_NUMVAL(o_named);

  168.             else if (!strcmp(buf, "default")) d = DEFAULT_NUMVAL(o);

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

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

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

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

  173.             else {

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

  175.                 if (res < 0) {

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

  177.                     return res;

  178.                 }

  179.             }

  180.         }

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

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

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

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

  185.         } else {

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

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

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

  189.         }

  190. 

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

  192.             return ret;

  193.         val += i;

  194.         if (!*val)

  195.             return 0;

  196.         notfirst = 1;

  197.     }

  198. 

  199.     return 0;

  200. }

  201. 

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

  203. {

  204.     void *dst, *target_obj;

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

  206.     if (!o || !target_obj)

  207.         return AVERROR_OPTION_NOT_FOUND;

  208.     if (!val)

  209.         return AVERROR(EINVAL);

  210. 

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

  212.     switch (o->type) {

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

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

  215.     case AV_OPT_TYPE_FLAGS:

  216.     case AV_OPT_TYPE_INT:

  217.     case AV_OPT_TYPE_INT64:

  218.     case AV_OPT_TYPE_FLOAT:

  219.     case AV_OPT_TYPE_DOUBLE:

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

  221.     }

  222. 

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

  224.     return AVERROR(EINVAL);

  225. }

  226. 

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

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

  229.     {\

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

  231.             return AVERROR(EINVAL);\

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

  233.     }

  234. 

  235. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  236. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  237. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  238. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  239. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  240. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  241. 

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

  243.                                   int search_flags)

  244. {

  245.     void *dst, *target_obj;

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

  247. 

  248.     if (!o || !target_obj)

  249.         return AVERROR_OPTION_NOT_FOUND;

  250. 

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

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

  253. }

  254. 

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

  256. {

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

  258. }

  259. 

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

  261. {

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

  263. }

  264. 

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

  266. {

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

  268. }

  269. 

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

  271. {

  272.     void *target_obj;

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

  274.     uint8_t *ptr;

  275.     uint8_t **dst;

  276.     int *lendst;

  277. 

  278.     if (!o || !target_obj)

  279.         return AVERROR_OPTION_NOT_FOUND;

  280. 

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

  282.         return AVERROR(EINVAL);

  283. 

  284.     ptr = av_malloc(len);

  285.     if (!ptr)

  286.         return AVERROR(ENOMEM);

  287. 

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

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

  290. 

  291.     av_free(*dst);

  292.     *dst = ptr;

  293.     *lendst = len;

  294.     memcpy(ptr, val, len);

  295. 

  296.     return 0;

  297. }

  298. 

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

  300. {

  301.     void *dst, *target_obj;

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

  303.     uint8_t *bin, buf[128];

  304.     int len, i, ret;

  305. 

  306.     if (!o || !target_obj)

  307.         return AVERROR_OPTION_NOT_FOUND;

  308. 

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

  310. 

  311.     buf[0] = 0;

  312.     switch (o->type) {

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

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

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

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

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

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

  319.     case AV_OPT_TYPE_STRING:

  320.         if (*(uint8_t**)dst)

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

  322.         else

  323.             *out_val = av_strdup("");

  324.         return 0;

  325.     case AV_OPT_TYPE_BINARY:

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

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

  328.             return AVERROR(EINVAL);

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

  330.             return AVERROR(ENOMEM);

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

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

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

  334.         return 0;

  335.     default:

  336.         return AVERROR(EINVAL);

  337.     }

  338. 

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

  340.         return AVERROR(EINVAL);

  341.     *out_val = av_strdup(buf);

  342.     return 0;

  343. }

  344. 

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

  346.                       int search_flags)

  347. {

  348.     void *dst, *target_obj;

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

  350.     if (!o || !target_obj)

  351.         goto error;

  352. 

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

  354. 

  355.     if (o_out) *o_out= o;

  356. 

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

  358. 

  359. error:

  360.     *den=*intnum=0;

  361.     return -1;

  362. }

  363. 

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

  365. {

  366.     int64_t intnum = 1;

  367.     double     num = 1;

  368.     int   ret, den = 1;

  369. 

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

  371.         return ret;

  372.     *out_val = num*intnum/den;

  373.     return 0;

  374. }

  375. 

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

  377. {

  378.     int64_t intnum = 1;

  379.     double     num = 1;

  380.     int   ret, den = 1;

  381. 

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

  383.         return ret;

  384.     *out_val = num*intnum/den;

  385.     return 0;

  386. }

  387. 

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

  389. {

  390.     int64_t intnum = 1;

  391.     double     num = 1;

  392.     int   ret, den = 1;

  393. 

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

  395.         return ret;

  396. 

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

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

  399.     else

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

  401.     return 0;

  402. }

  403. 

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

  405. {

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

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

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

  409.     int64_t res;

  410. 

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

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

  413.         return 0;

  414.     return res & flag->default_val.i64;

  415. }

  416. 

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

  418.                      int req_flags, int rej_flags)

  419. {

  420.     const AVOption *opt=NULL;

  421. 

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

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

  424.             continue;

  425. 

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

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

  428.          * Only print items from the requested unit.

  429.          */

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

  431.             continue;

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

  433.             continue;

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

  435.             continue;

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

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

  438.         else

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

  440. 

  441.         switch (opt->type) {

  442.             case AV_OPT_TYPE_FLAGS:

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

  444.                 break;

  445.             case AV_OPT_TYPE_INT:

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

  447.                 break;

  448.             case AV_OPT_TYPE_INT64:

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

  450.                 break;

  451.             case AV_OPT_TYPE_DOUBLE:

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

  453.                 break;

  454.             case AV_OPT_TYPE_FLOAT:

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

  456.                 break;

  457.             case AV_OPT_TYPE_STRING:

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

  459.                 break;

  460.             case AV_OPT_TYPE_RATIONAL:

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

  462.                 break;

  463.             case AV_OPT_TYPE_BINARY:

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

  465.                 break;

  466.             case AV_OPT_TYPE_CONST:

  467.             default:

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

  469.                 break;

  470.         }

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

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

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

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

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

  476. 

  477.         if (opt->help)

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

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

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

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

  482.         }

  483.     }

  484. }

  485. 

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

  487. {

  488.     if (!obj)

  489.         return -1;

  490. 

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

  492. 

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

  494. 

  495.     return 0;

  496. }

  497. 

  498. void av_opt_set_defaults(void *s)

  499. {

  500.     const AVOption *opt = NULL;

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

  502.         switch (opt->type) {

  503.             case AV_OPT_TYPE_CONST:

  504.                 /* Nothing to be done here */

  505.             break;

  506.             case AV_OPT_TYPE_FLAGS:

  507.             case AV_OPT_TYPE_INT:

  508.             case AV_OPT_TYPE_INT64:

  509.                 av_opt_set_int(s, opt->name, opt->default_val.i64, 0);

  510.             break;

  511.             case AV_OPT_TYPE_DOUBLE:

  512.             case AV_OPT_TYPE_FLOAT: {

  513.                 double val;

  514.                 val = opt->default_val.dbl;

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

  516.             }

  517.             break;

  518.             case AV_OPT_TYPE_RATIONAL: {

  519.                 AVRational val;

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

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

  522.             }

  523.             break;

  524.             case AV_OPT_TYPE_STRING:

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

  526.                 break;

  527.             case AV_OPT_TYPE_BINARY:

  528.                 /* Cannot set default for binary */

  529.             break;

  530.             default:

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

  532.         }

  533.     }

  534. }

  535. 

  536. /**

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

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

  539.  *

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

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

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

  543.  * separate key from value

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

  545.  * two pairs from each other

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

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

  548.  * of error:

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

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

  551.  * cannot be set

  552.  */

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

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

  555. {

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

  557.     char *val;

  558.     int ret;

  559. 

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

  561.         (*buf)++;

  562.         val = av_get_token(buf, pairs_sep);

  563.     } else {

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

  565.         av_free(key);

  566.         return AVERROR(EINVAL);

  567.     }

  568. 

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

  570. 

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

  572.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  574. 

  575.     av_free(key);

  576.     av_free(val);

  577.     return ret;

  578. }

  579. 

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

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

  582. {

  583.     int ret, count = 0;

  584. 

  585.     if (!opts)

  586.         return 0;

  587. 

  588.     while (*opts) {

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

  590.             return ret;

  591.         count++;

  592. 

  593.         if (*opts)

  594.             opts++;

  595.     }

  596. 

  597.     return count;

  598. }

  599. 

  600. void av_opt_free(void *obj)

  601. {

  602.     const AVOption *o = NULL;

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

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

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

  606. }

  607. 

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

  609. {

  610.     AVDictionaryEntry *t = NULL;

  611.     AVDictionary    *tmp = NULL;

  612.     int ret = 0;

  613. 

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

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

  616.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  618.         else if (ret < 0) {

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

  620.             break;

  621.         }

  622.         ret = 0;

  623.     }

  624.     av_dict_free(options);

  625.     *options = tmp;

  626.     return ret;

  627. }

  628. 

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

  630.                             int opt_flags, int search_flags)

  631. {

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

  633. }

  634. 

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

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

  637. {

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

  639.     const AVOption *o = NULL;

  640. 

  641.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  642.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  643.             const AVClass *child = NULL;

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

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

  646.                     return o;

  647.         } else {

  648.             void *child = NULL;

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

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

  651.                     return o;

  652.         }

  653.     }

  654. 

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

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

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

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

  659.             if (target_obj) {

  660.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  661.                     *target_obj = obj;

  662.                 else

  663.                     *target_obj = NULL;

  664.             }

  665.             return o;

  666.         }

  667.     }

  668.     return NULL;

  669. }

  670. 

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

  672. {

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

  674.     if (c->child_next)

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

  676.     return NULL;

  677. }

  678. 

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

  680. {

  681.     if (parent->child_class_next)

  682.         return parent->child_class_next(prev);

  683.     return NULL;

  684. }

  685. 

  686. #ifdef TEST

  687. 

  688. #undef printf

  689. 

  690. typedef struct TestContext

  691. {

  692.     const AVClass *class;

  693.     int num;

  694.     int toggle;

  695.     char *string;

  696.     int flags;

  697.     AVRational rational;

  698. } TestContext;

  699. 

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

  701. 

  702. #define TEST_FLAG_COOL 01

  703. #define TEST_FLAG_LAME 02

  704. #define TEST_FLAG_MU   04

  705. 

  706. static const AVOption test_options[]= {

  707. {"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {.i64 = 0},       0,        100                 },

  708. {"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {.i64 = 0},       0,        1                   },

  709. {"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {.dbl = 0},  0,        10                  },

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

  711. {"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {.i64 = 0},       0,        INT_MAX, 0, "flags" },

  712. {"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },

  713. {"lame",     "set lame flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },

  714. {"mu",       "set mu flag ",   0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },

  715. {NULL},

  716. };

  717. 

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

  719. {

  720.     return "test";

  721. }

  722. 

  723. static const AVClass test_class = {

  724.     "TestContext",

  725.     test_get_name,

  726.     test_options

  727. };

  728. 

  729. int main(void)

  730. {

  731.     int i;

  732. 

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

  734.     {

  735.         TestContext test_ctx;

  736.         const char *options[] = {

  737.             "",

  738.             ":",

  739.             "=",

  740.             "foo=:",

  741.             ":=foo",

  742.             "=foo",

  743.             "foo=",

  744.             "foo",

  745.             "foo=val",

  746.             "foo==val",

  747.             "toggle=:",

  748.             "string=:",

  749.             "toggle=1 : foo",

  750.             "toggle=100",

  751.             "toggle==1",

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

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

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

  755.             "rational=-1/0",

  756.         };

  757. 

  758.         test_ctx.class = &test_class;

  759.         av_opt_set_defaults(&test_ctx);

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

  761. 

  762.         av_log_set_level(AV_LOG_DEBUG);

  763. 

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

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

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

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

  768.             printf("\n");

  769.         }

  770.     }

  771. 

  772.     return 0;

  773. }

  774. 

  775. #endif