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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 FFmpeg.

  6.  *

  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * AVOptions

  25.  * @author Michael Niedermayer <michaelni@gmx.at>

  26.  */

  27. 

  28. #include "avutil.h"

  29. #include "avstring.h"

  30. #include "opt.h"

  31. #include "eval.h"

  32. #include "dict.h"

  33. #include "log.h"

  34. #include "parseutils.h"

  35. 

  36. #if FF_API_FIND_OPT

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

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

  39. {

  40.     const AVOption *o = NULL;

  41. 

  42.     while ((o = av_next_option(v, 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.     case AV_OPT_TYPE_CONST:     *num    = o->default_val.dbl; return 0;

  77.     }

  78.     return AVERROR(EINVAL);

  79. }

  80. 

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

  82. {

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

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

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

  86.         return AVERROR(ERANGE);

  87.     }

  88. 

  89.     switch (o->type) {

  90.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  95.     case AV_OPT_TYPE_RATIONAL:

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

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

  98.         break;

  99.     default:

  100.         return AVERROR(EINVAL);

  101.     }

  102.     return 0;

  103. }

  104. 

  105. static const double const_values[] = {

  106.     M_PI,

  107.     M_E,

  108.     FF_QP2LAMBDA,

  109.     0

  110. };

  111. 

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

  113.     "PI",

  114.     "E",

  115.     "QP2LAMBDA",

  116.     0

  117. };

  118. 

  119. static int hexchar2int(char c) {

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

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

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

  123.     return -1;

  124. }

  125. 

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

  127. {

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

  129.     uint8_t *bin, *ptr;

  130.     int len = strlen(val);

  131. 

  132.     av_freep(dst);

  133.     *lendst = 0;

  134. 

  135.     if (len & 1)

  136.         return AVERROR(EINVAL);

  137.     len /= 2;

  138. 

  139.     ptr = bin = av_malloc(len);

  140.     while (*val) {

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

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

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

  144.             av_free(bin);

  145.             return AVERROR(EINVAL);

  146.         }

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

  148.     }

  149.     *dst = bin;

  150.     *lendst = len;

  151. 

  152.     return 0;

  153. }

  154. 

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

  156. {

  157.     av_freep(dst);

  158.     *dst = av_strdup(val);

  159.     return 0;

  160. }

  161. 

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

  163. {

  164.     int ret = 0, notfirst = 0;

  165.     for (;;) {

  166.         int i, den = 1;

  167.         char buf[256];

  168.         int cmd = 0;

  169.         double d, num = 1;

  170.         int64_t intnum = 1;

  171. 

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

  173.             cmd = *(val++);

  174. 

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

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

  177.         buf[i] = 0;

  178. 

  179.         {

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

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

  182.                 d = o_named->default_val.dbl;

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

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

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

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

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

  188.             else {

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

  190.                 if (res < 0) {

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

  192.                     return res;

  193.                 }

  194.             }

  195.         }

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

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

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

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

  200.         } else {

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

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

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

  204.         }

  205. 

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

  207.             return ret;

  208.         val += i;

  209.         if (!*val)

  210.             return 0;

  211.         notfirst = 1;

  212.     }

  213. 

  214.     return 0;

  215. }

  216. 

  217. #if FF_API_OLD_AVOPTIONS

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

  219. {

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

  221.     if (o_out)

  222.         *o_out = o;

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

  224. }

  225. #endif

  226. 

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

  228. {

  229.     int ret;

  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 && o->type != AV_OPT_TYPE_STRING)

  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.     case AV_OPT_TYPE_IMAGE_SIZE:

  248.         ret = av_parse_video_size(dst, ((int *)dst) + 1, val);

  249.         if (ret < 0)

  250.             av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as image size\n", val);

  251.         return ret;

  252.     }

  253. 

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

  255.     return AVERROR(EINVAL);

  256. }

  257. 

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

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

  260.     {\

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

  262.             return AVERROR(EINVAL);\

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

  264.     }

  265. 

  266. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  267. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  268. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  269. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  270. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  271. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  272. 

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

  274.                                   int search_flags)

  275. {

  276.     void *dst, *target_obj;

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

  278. 

  279.     if (!o || !target_obj)

  280.         return AVERROR_OPTION_NOT_FOUND;

  281. 

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

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

  284. }

  285. 

  286. #if FF_API_OLD_AVOPTIONS

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

  288. {

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

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

  291.         return NULL;

  292.     return o;

  293. }

  294. 

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

  296. {

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

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

  299.         return NULL;

  300.     return o;

  301. }

  302. 

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

  304. {

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

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

  307.         return NULL;

  308.     return o;

  309. }

  310. #endif

  311. 

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

  313. {

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

  315. }

  316. 

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

  318. {

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

  320. }

  321. 

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

  323. {

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

  325. }

  326. 

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

  328. {

  329.     void *target_obj;

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

  331.     uint8_t *ptr;

  332.     uint8_t **dst;

  333.     int *lendst;

  334. 

  335.     if (!o || !target_obj)

  336.         return AVERROR_OPTION_NOT_FOUND;

  337. 

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

  339.         return AVERROR(EINVAL);

  340. 

  341.     ptr = av_malloc(len);

  342.     if (!ptr)

  343.         return AVERROR(ENOMEM);

  344. 

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

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

  347. 

  348.     av_free(*dst);

  349.     *dst = ptr;

  350.     *lendst = len;

  351.     memcpy(ptr, val, len);

  352. 

  353.     return 0;

  354. }

  355. 

  356. #if FF_API_OLD_AVOPTIONS

  357. /**

  358.  *

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

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

  361.  */

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

  363. {

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

  365.     void *dst;

  366.     uint8_t *bin;

  367.     int len, i;

  368.     if (!o)

  369.         return NULL;

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

  371.         return NULL;

  372. 

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

  374.     if (o_out) *o_out= o;

  375. 

  376.     switch (o->type) {

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

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

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

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

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

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

  383.     case AV_OPT_TYPE_CONST:     snprintf(buf, buf_len, "%f" , o->default_val.dbl);break;

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

  385.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  390.         break;

  391.     default: return NULL;

  392.     }

  393.     return buf;

  394. }

  395. #endif

  396. 

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

  398. {

  399.     void *dst, *target_obj;

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

  401.     uint8_t *bin, buf[128];

  402.     int len, i, ret;

  403. 

  404.     if (!o || !target_obj || (o->offset<=0 && o->type != AV_OPT_TYPE_CONST))

  405.         return AVERROR_OPTION_NOT_FOUND;

  406. 

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

  408. 

  409.     buf[0] = 0;

  410.     switch (o->type) {

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

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

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

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

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

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

  417.     case AV_OPT_TYPE_CONST:     ret = snprintf(buf, sizeof(buf), "%f" ,     o->default_val.dbl);break;

  418.     case AV_OPT_TYPE_STRING:

  419.         if (*(uint8_t**)dst)

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

  421.         else

  422.             *out_val = av_strdup("");

  423.         return 0;

  424.     case AV_OPT_TYPE_BINARY:

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

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

  427.             return AVERROR(EINVAL);

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

  429.             return AVERROR(ENOMEM);

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

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

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

  433.         return 0;

  434.     case AV_OPT_TYPE_IMAGE_SIZE:

  435.         ret = snprintf(buf, sizeof(buf), "%dx%d", ((int *)dst)[0], ((int *)dst)[1]);

  436.         break;

  437.     default:

  438.         return AVERROR(EINVAL);

  439.     }

  440. 

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

  442.         return AVERROR(EINVAL);

  443.     *out_val = av_strdup(buf);

  444.     return 0;

  445. }

  446. 

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

  448.                       int search_flags)

  449. {

  450.     void *dst, *target_obj;

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

  452.     if (!o || !target_obj)

  453.         goto error;

  454. 

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

  456. 

  457.     if (o_out) *o_out= o;

  458. 

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

  460. 

  461. error:

  462.     *den=*intnum=0;

  463.     return -1;

  464. }

  465. 

  466. #if FF_API_OLD_AVOPTIONS

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

  468. {

  469.     int64_t intnum=1;

  470.     double num=1;

  471.     int den=1;

  472. 

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

  474.         return NAN;

  475.     return num*intnum/den;

  476. }

  477. 

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

  479. {

  480.     int64_t intnum=1;

  481.     double num=1;

  482.     int den=1;

  483. 

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

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

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

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

  488.     else

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

  490. }

  491. 

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

  493. {

  494.     int64_t intnum=1;

  495.     double num=1;

  496.     int den=1;

  497. 

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

  499.         return -1;

  500.     return num*intnum/den;

  501. }

  502. #endif

  503. 

  504. int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *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_double(void *obj, const char *name, int search_flags, double *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.     *out_val = num*intnum/den;

  525.     return 0;

  526. }

  527. 

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

  529. {

  530.     int64_t intnum = 1;

  531.     double     num = 1;

  532.     int   ret, den = 1;

  533. 

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

  535.         return ret;

  536. 

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

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

  539.     else

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

  541.     return 0;

  542. }

  543. 

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

  545. {

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

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

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

  549.     int64_t res;

  550. 

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

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

  553.         return 0;

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

  555. }

  556. 

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

  558.                      int req_flags, int rej_flags)

  559. {

  560.     const AVOption *opt=NULL;

  561. 

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

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

  564.             continue;

  565. 

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

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

  568.          * Only print items from the requested unit.

  569.          */

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

  571.             continue;

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

  573.             continue;

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

  575.             continue;

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

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

  578.         else

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

  580. 

  581.         switch (opt->type) {

  582.             case AV_OPT_TYPE_FLAGS:

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

  584.                 break;

  585.             case AV_OPT_TYPE_INT:

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

  587.                 break;

  588.             case AV_OPT_TYPE_INT64:

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

  590.                 break;

  591.             case AV_OPT_TYPE_DOUBLE:

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

  593.                 break;

  594.             case AV_OPT_TYPE_FLOAT:

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

  596.                 break;

  597.             case AV_OPT_TYPE_STRING:

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

  599.                 break;

  600.             case AV_OPT_TYPE_RATIONAL:

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

  602.                 break;

  603.             case AV_OPT_TYPE_BINARY:

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

  605.                 break;

  606.             case AV_OPT_TYPE_IMAGE_SIZE:

  607.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<image_size>");

  608.                 break;

  609.             case AV_OPT_TYPE_CONST:

  610.             default:

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

  612.                 break;

  613.         }

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

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

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

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

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

  619. 

  620.         if (opt->help)

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

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

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

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

  625.         }

  626.     }

  627. }

  628. 

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

  630. {

  631.     if (!obj)

  632.         return -1;

  633. 

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

  635. 

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

  637. 

  638.     return 0;

  639. }

  640. 

  641. void av_opt_set_defaults(void *s)

  642. {

  643. #if FF_API_OLD_AVOPTIONS

  644.     av_opt_set_defaults2(s, 0, 0);

  645. }

  646. 

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

  648. {

  649. #endif

  650.     const AVOption *opt = NULL;

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

  652. #if FF_API_OLD_AVOPTIONS

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

  654.             continue;

  655. #endif

  656.         switch (opt->type) {

  657.             case AV_OPT_TYPE_CONST:

  658.                 /* Nothing to be done here */

  659.             break;

  660.             case AV_OPT_TYPE_FLAGS:

  661.             case AV_OPT_TYPE_INT: {

  662.                 int val;

  663.                 val = opt->default_val.dbl;

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

  665.             }

  666.             break;

  667.             case AV_OPT_TYPE_INT64:

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

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

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

  671.             break;

  672.             case AV_OPT_TYPE_DOUBLE:

  673.             case AV_OPT_TYPE_FLOAT: {

  674.                 double val;

  675.                 val = opt->default_val.dbl;

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

  677.             }

  678.             break;

  679.             case AV_OPT_TYPE_RATIONAL: {

  680.                 AVRational val;

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

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

  683.             }

  684.             break;

  685.             case AV_OPT_TYPE_STRING:

  686.             case AV_OPT_TYPE_IMAGE_SIZE:

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

  688.                 break;

  689.             case AV_OPT_TYPE_BINARY:

  690.                 /* Cannot set default for binary */

  691.             break;

  692.             default:

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

  694.         }

  695.     }

  696. }

  697. 

  698. /**

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

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

  701.  *

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

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

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

  705.  * separate key from value

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

  707.  * two pairs from each other

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

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

  710.  * of error:

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

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

  713.  * cannot be set

  714.  */

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

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

  717. {

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

  719.     char *val;

  720.     int ret;

  721. 

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

  723.         (*buf)++;

  724.         val = av_get_token(buf, pairs_sep);

  725.     } else {

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

  727.         av_free(key);

  728.         return AVERROR(EINVAL);

  729.     }

  730. 

  731.     av_log(ctx, AV_LOG_DEBUG, "Setting entry with key '%s' to value '%s'\n", key, val);

  732. 

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

  734.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  736. 

  737.     av_free(key);

  738.     av_free(val);

  739.     return ret;

  740. }

  741. 

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

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

  744. {

  745.     int ret, count = 0;

  746. 

  747.     if (!opts)

  748.         return 0;

  749. 

  750.     while (*opts) {

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

  752.             return ret;

  753.         count++;

  754. 

  755.         if (*opts)

  756.             opts++;

  757.     }

  758. 

  759.     return count;

  760. }

  761. 

  762. void av_opt_free(void *obj)

  763. {

  764.     const AVOption *o = NULL;

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

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

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

  768. }

  769. 

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

  771. {

  772.     AVDictionaryEntry *t = NULL;

  773.     AVDictionary    *tmp = NULL;

  774.     int ret = 0;

  775. 

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

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

  778.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  780.         else if (ret < 0) {

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

  782.             break;

  783.         }

  784.         ret = 0;

  785.     }

  786.     av_dict_free(options);

  787.     *options = tmp;

  788.     return ret;

  789. }

  790. 

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

  792.                             int opt_flags, int search_flags)

  793. {

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

  795. }

  796. 

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

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

  799. {

  800.     const AVClass  *c;

  801.     const AVOption *o = NULL;

  802. 

  803.     if(!obj)

  804.         return NULL;

  805. 

  806.     c= *(AVClass**)obj;

  807. 

  808.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  809.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  810.             const AVClass *child = NULL;

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

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

  813.                     return o;

  814.         } else {

  815.             void *child = NULL;

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

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

  818.                     return o;

  819.         }

  820.     }

  821. 

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

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

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

  825.              (unit  && o->type == AV_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)))) {

  826.             if (target_obj) {

  827.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  828.                     *target_obj = obj;

  829.                 else

  830.                     *target_obj = NULL;

  831.             }

  832.             return o;

  833.         }

  834.     }

  835.     return NULL;

  836. }

  837. 

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

  839. {

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

  841.     if (c->child_next)

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

  843.     return NULL;

  844. }

  845. 

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

  847. {

  848.     if (parent->child_class_next)

  849.         return parent->child_class_next(prev);

  850.     return NULL;

  851. }

  852. 

  853. void *av_opt_ptr(const AVClass *class, void *obj, const char *name)

  854. {

  855.     const AVOption *opt= av_opt_find2(&class, name, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ, NULL);

  856.     if(!opt)

  857.         return NULL;

  858.     return (uint8_t*)obj + opt->offset;

  859. }

  860. 

  861. #ifdef TEST

  862. 

  863. #undef printf

  864. 

  865. typedef struct TestContext

  866. {

  867.     const AVClass *class;

  868.     int num;

  869.     int toggle;

  870.     char *string;

  871.     int flags;

  872.     AVRational rational;

  873. } TestContext;

  874. 

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

  876. 

  877. #define TEST_FLAG_COOL 01

  878. #define TEST_FLAG_LAME 02

  879. #define TEST_FLAG_MU   04

  880. 

  881. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  890. {NULL},

  891. };

  892. 

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

  894. {

  895.     return "test";

  896. }

  897. 

  898. static const AVClass test_class = {

  899.     "TestContext",

  900.     test_get_name,

  901.     test_options

  902. };

  903. 

  904. int main(void)

  905. {

  906.     int i;

  907. 

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

  909.     {

  910.         TestContext test_ctx;

  911.         const char *options[] = {

  912.             "",

  913.             ":",

  914.             "=",

  915.             "foo=:",

  916.             ":=foo",

  917.             "=foo",

  918.             "foo=",

  919.             "foo",

  920.             "foo=val",

  921.             "foo==val",

  922.             "toggle=:",

  923.             "string=:",

  924.             "toggle=1 : foo",

  925.             "toggle=100",

  926.             "toggle==1",

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

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

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

  930.             "rational=-1/0",

  931.         };

  932. 

  933.         test_ctx.class = &test_class;

  934.         av_opt_set_defaults(&test_ctx);

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

  936. 

  937.         av_log_set_level(AV_LOG_DEBUG);

  938. 

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

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

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

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

  943.             printf("\n");

  944.         }

  945.     }

  946. 

  947.     return 0;

  948. }

  949. 

  950. #endif