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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. #include "pixdesc.h"

  36. #include "mathematics.h"

  37. 

  38. #if FF_API_FIND_OPT

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

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

  41. {

  42.     const AVOption *o = NULL;

  43. 

  44.     while ((o = av_next_option(v, o))) {

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

  46.             return o;

  47.     }

  48.     return NULL;

  49. }

  50. #endif

  51. 

  52. #if FF_API_OLD_AVOPTIONS

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

  54. {

  55.     return av_opt_next(obj, last);

  56. }

  57. #endif

  58. 

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

  60. {

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

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

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

  64.     return NULL;

  65. }

  66. 

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

  68. {

  69.     switch (o->type) {

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

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

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

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

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

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

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

  77.                                                         return 0;

  78.     case AV_OPT_TYPE_CONST:     *num    = o->default_val.dbl; return 0;

  79.     }

  80.     return AVERROR(EINVAL);

  81. }

  82. 

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

  84. {

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

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

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

  88.         return AVERROR(ERANGE);

  89.     }

  90. 

  91.     switch (o->type) {

  92.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  97.     case AV_OPT_TYPE_RATIONAL:

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

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

  100.         break;

  101.     default:

  102.         return AVERROR(EINVAL);

  103.     }

  104.     return 0;

  105. }

  106. 

  107. static const double const_values[] = {

  108.     M_PI,

  109.     M_E,

  110.     FF_QP2LAMBDA,

  111.     0

  112. };

  113. 

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

  115.     "PI",

  116.     "E",

  117.     "QP2LAMBDA",

  118.     0

  119. };

  120. 

  121. static int hexchar2int(char c) {

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

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

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

  125.     return -1;

  126. }

  127. 

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

  129. {

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

  131.     uint8_t *bin, *ptr;

  132.     int len = strlen(val);

  133. 

  134.     av_freep(dst);

  135.     *lendst = 0;

  136. 

  137.     if (len & 1)

  138.         return AVERROR(EINVAL);

  139.     len /= 2;

  140. 

  141.     ptr = bin = av_malloc(len);

  142.     while (*val) {

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

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

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

  146.             av_free(bin);

  147.             return AVERROR(EINVAL);

  148.         }

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

  150.     }

  151.     *dst = bin;

  152.     *lendst = len;

  153. 

  154.     return 0;

  155. }

  156. 

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

  158. {

  159.     av_freep(dst);

  160.     *dst = av_strdup(val);

  161.     return 0;

  162. }

  163. 

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

  165. {

  166.     int ret = 0, notfirst = 0;

  167.     for (;;) {

  168.         int i, den = 1;

  169.         char buf[256];

  170.         int cmd = 0;

  171.         double d, num = 1;

  172.         int64_t intnum = 1;

  173. 

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

  175.             cmd = *(val++);

  176. 

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

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

  179.         buf[i] = 0;

  180. 

  181.         {

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

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

  184.                 d = o_named->default_val.dbl;

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

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

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

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

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

  190.             else {

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

  192.                 if (res < 0) {

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

  194.                     return res;

  195.                 }

  196.             }

  197.         }

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

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

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

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

  202.         } else {

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

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

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

  206.         }

  207. 

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

  209.             return ret;

  210.         val += i;

  211.         if (!*val)

  212.             return 0;

  213.         notfirst = 1;

  214.     }

  215. 

  216.     return 0;

  217. }

  218. 

  219. #if FF_API_OLD_AVOPTIONS

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

  221. {

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

  223.     if (o_out)

  224.         *o_out = o;

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

  226. }

  227. #endif

  228. 

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

  230. {

  231.     int ret;

  232.     void *dst, *target_obj;

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

  234.     if (!o || !target_obj)

  235.         return AVERROR_OPTION_NOT_FOUND;

  236.     if (!val && o->type != AV_OPT_TYPE_STRING)

  237.         return AVERROR(EINVAL);

  238. 

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

  240.     switch (o->type) {

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

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

  243.     case AV_OPT_TYPE_FLAGS:

  244.     case AV_OPT_TYPE_INT:

  245.     case AV_OPT_TYPE_INT64:

  246.     case AV_OPT_TYPE_FLOAT:

  247.     case AV_OPT_TYPE_DOUBLE:

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

  249.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  251.         if (ret < 0)

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

  253.         return ret;

  254.     case AV_OPT_TYPE_PIXEL_FMT:

  255.         ret = av_get_pix_fmt(val);

  256.         if (ret == PIX_FMT_NONE) {

  257.             char *tail;

  258.             ret = strtol(val, &tail, 0);

  259.             if (*tail || (unsigned)ret >= PIX_FMT_NB) {

  260.                 av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as pixel format\n", val);

  261.                 return AVERROR(EINVAL);

  262.             }

  263.         }

  264.         *(enum PixelFormat *)dst = ret;

  265.         return 0;

  266.     }

  267. 

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

  269.     return AVERROR(EINVAL);

  270. }

  271. 

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

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

  274.     {\

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

  276.             return AVERROR(EINVAL);\

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

  278.     }

  279. 

  280. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  281. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  282. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  283. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  284. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  285. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  286. 

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

  288.                                   int search_flags)

  289. {

  290.     void *dst, *target_obj;

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

  292. 

  293.     if (!o || !target_obj)

  294.         return AVERROR_OPTION_NOT_FOUND;

  295. 

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

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

  298. }

  299. 

  300. #if FF_API_OLD_AVOPTIONS

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

  302. {

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

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

  305.         return NULL;

  306.     return o;

  307. }

  308. 

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

  310. {

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

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

  313.         return NULL;

  314.     return o;

  315. }

  316. 

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

  318. {

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

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

  321.         return NULL;

  322.     return o;

  323. }

  324. #endif

  325. 

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

  327. {

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

  329. }

  330. 

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

  332. {

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

  334. }

  335. 

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

  337. {

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

  339. }

  340. 

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

  342. {

  343.     void *target_obj;

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

  345.     uint8_t *ptr;

  346.     uint8_t **dst;

  347.     int *lendst;

  348. 

  349.     if (!o || !target_obj)

  350.         return AVERROR_OPTION_NOT_FOUND;

  351. 

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

  353.         return AVERROR(EINVAL);

  354. 

  355.     ptr = av_malloc(len);

  356.     if (!ptr)

  357.         return AVERROR(ENOMEM);

  358. 

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

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

  361. 

  362.     av_free(*dst);

  363.     *dst = ptr;

  364.     *lendst = len;

  365.     memcpy(ptr, val, len);

  366. 

  367.     return 0;

  368. }

  369. 

  370. #if FF_API_OLD_AVOPTIONS

  371. /**

  372.  *

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

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

  375.  */

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

  377. {

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

  379.     void *dst;

  380.     uint8_t *bin;

  381.     int len, i;

  382.     if (!o)

  383.         return NULL;

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

  385.         return NULL;

  386. 

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

  388.     if (o_out) *o_out= o;

  389. 

  390.     switch (o->type) {

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

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

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

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

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

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

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

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

  399.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  404.         break;

  405.     default: return NULL;

  406.     }

  407.     return buf;

  408. }

  409. #endif

  410. 

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

  412. {

  413.     void *dst, *target_obj;

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

  415.     uint8_t *bin, buf[128];

  416.     int len, i, ret;

  417. 

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

  419.         return AVERROR_OPTION_NOT_FOUND;

  420. 

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

  422. 

  423.     buf[0] = 0;

  424.     switch (o->type) {

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

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

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

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

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

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

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

  432.     case AV_OPT_TYPE_STRING:

  433.         if (*(uint8_t**)dst)

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

  435.         else

  436.             *out_val = av_strdup("");

  437.         return 0;

  438.     case AV_OPT_TYPE_BINARY:

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

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

  441.             return AVERROR(EINVAL);

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

  443.             return AVERROR(ENOMEM);

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

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

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

  447.         return 0;

  448.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  450.         break;

  451.     case AV_OPT_TYPE_PIXEL_FMT:

  452.         ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_pix_fmt_name(*(enum PixelFormat *)dst), "?"));

  453.         break;

  454.     default:

  455.         return AVERROR(EINVAL);

  456.     }

  457. 

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

  459.         return AVERROR(EINVAL);

  460.     *out_val = av_strdup(buf);

  461.     return 0;

  462. }

  463. 

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

  465.                       int search_flags)

  466. {

  467.     void *dst, *target_obj;

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

  469.     if (!o || !target_obj)

  470.         goto error;

  471. 

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

  473. 

  474.     if (o_out) *o_out= o;

  475. 

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

  477. 

  478. error:

  479.     *den=*intnum=0;

  480.     return -1;

  481. }

  482. 

  483. #if FF_API_OLD_AVOPTIONS

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

  485. {

  486.     int64_t intnum=1;

  487.     double num=1;

  488.     int den=1;

  489. 

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

  491.         return NAN;

  492.     return num*intnum/den;

  493. }

  494. 

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

  496. {

  497.     int64_t intnum=1;

  498.     double num=1;

  499.     int den=1;

  500. 

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

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

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

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

  505.     else

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

  507. }

  508. 

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

  510. {

  511.     int64_t intnum=1;

  512.     double num=1;

  513.     int den=1;

  514. 

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

  516.         return -1;

  517.     return num*intnum/den;

  518. }

  519. #endif

  520. 

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

  522. {

  523.     int64_t intnum = 1;

  524.     double     num = 1;

  525.     int   ret, den = 1;

  526. 

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

  528.         return ret;

  529.     *out_val = num*intnum/den;

  530.     return 0;

  531. }

  532. 

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

  534. {

  535.     int64_t intnum = 1;

  536.     double     num = 1;

  537.     int   ret, den = 1;

  538. 

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

  540.         return ret;

  541.     *out_val = num*intnum/den;

  542.     return 0;

  543. }

  544. 

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

  546. {

  547.     int64_t intnum = 1;

  548.     double     num = 1;

  549.     int   ret, den = 1;

  550. 

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

  552.         return ret;

  553. 

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

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

  556.     else

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

  558.     return 0;

  559. }

  560. 

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

  562. {

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

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

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

  566.     int64_t res;

  567. 

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

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

  570.         return 0;

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

  572. }

  573. 

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

  575.                      int req_flags, int rej_flags)

  576. {

  577.     const AVOption *opt=NULL;

  578. 

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

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

  581.             continue;

  582. 

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

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

  585.          * Only print items from the requested unit.

  586.          */

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

  588.             continue;

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

  590.             continue;

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

  592.             continue;

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

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

  595.         else

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

  597. 

  598.         switch (opt->type) {

  599.             case AV_OPT_TYPE_FLAGS:

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

  601.                 break;

  602.             case AV_OPT_TYPE_INT:

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

  604.                 break;

  605.             case AV_OPT_TYPE_INT64:

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

  607.                 break;

  608.             case AV_OPT_TYPE_DOUBLE:

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

  610.                 break;

  611.             case AV_OPT_TYPE_FLOAT:

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

  613.                 break;

  614.             case AV_OPT_TYPE_STRING:

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

  616.                 break;

  617.             case AV_OPT_TYPE_RATIONAL:

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

  619.                 break;

  620.             case AV_OPT_TYPE_BINARY:

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

  622.                 break;

  623.             case AV_OPT_TYPE_IMAGE_SIZE:

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

  625.                 break;

  626.             case AV_OPT_TYPE_PIXEL_FMT:

  627.                 av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<pix_fmt>");

  628.                 break;

  629.             case AV_OPT_TYPE_CONST:

  630.             default:

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

  632.                 break;

  633.         }

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

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

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

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

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

  639. 

  640.         if (opt->help)

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

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

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

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

  645.         }

  646.     }

  647. }

  648. 

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

  650. {

  651.     if (!obj)

  652.         return -1;

  653. 

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

  655. 

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

  657. 

  658.     return 0;

  659. }

  660. 

  661. void av_opt_set_defaults(void *s)

  662. {

  663. #if FF_API_OLD_AVOPTIONS

  664.     av_opt_set_defaults2(s, 0, 0);

  665. }

  666. 

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

  668. {

  669. #endif

  670.     const AVOption *opt = NULL;

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

  672. #if FF_API_OLD_AVOPTIONS

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

  674.             continue;

  675. #endif

  676.         switch (opt->type) {

  677.             case AV_OPT_TYPE_CONST:

  678.                 /* Nothing to be done here */

  679.             break;

  680.             case AV_OPT_TYPE_FLAGS:

  681.             case AV_OPT_TYPE_INT: {

  682.                 int val;

  683.                 val = opt->default_val.dbl;

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

  685.             }

  686.             break;

  687.             case AV_OPT_TYPE_INT64:

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

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

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

  691.             break;

  692.             case AV_OPT_TYPE_DOUBLE:

  693.             case AV_OPT_TYPE_FLOAT: {

  694.                 double val;

  695.                 val = opt->default_val.dbl;

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

  697.             }

  698.             break;

  699.             case AV_OPT_TYPE_RATIONAL: {

  700.                 AVRational val;

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

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

  703.             }

  704.             break;

  705.             case AV_OPT_TYPE_STRING:

  706.             case AV_OPT_TYPE_IMAGE_SIZE:

  707.             case AV_OPT_TYPE_PIXEL_FMT:

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

  709.                 break;

  710.             case AV_OPT_TYPE_BINARY:

  711.                 /* Cannot set default for binary */

  712.             break;

  713.             default:

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

  715.         }

  716.     }

  717. }

  718. 

  719. /**

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

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

  722.  *

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

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

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

  726.  * separate key from value

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

  728.  * two pairs from each other

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

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

  731.  * of error:

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

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

  734.  * cannot be set

  735.  */

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

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

  738. {

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

  740.     char *val;

  741.     int ret;

  742. 

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

  744.         (*buf)++;

  745.         val = av_get_token(buf, pairs_sep);

  746.     } else {

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

  748.         av_free(key);

  749.         return AVERROR(EINVAL);

  750.     }

  751. 

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

  753. 

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

  755.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  757. 

  758.     av_free(key);

  759.     av_free(val);

  760.     return ret;

  761. }

  762. 

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

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

  765. {

  766.     int ret, count = 0;

  767. 

  768.     if (!opts)

  769.         return 0;

  770. 

  771.     while (*opts) {

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

  773.             return ret;

  774.         count++;

  775. 

  776.         if (*opts)

  777.             opts++;

  778.     }

  779. 

  780.     return count;

  781. }

  782. 

  783. void av_opt_free(void *obj)

  784. {

  785.     const AVOption *o = NULL;

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

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

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

  789. }

  790. 

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

  792. {

  793.     AVDictionaryEntry *t = NULL;

  794.     AVDictionary    *tmp = NULL;

  795.     int ret = 0;

  796. 

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

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

  799.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  801.         else if (ret < 0) {

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

  803.             break;

  804.         }

  805.         ret = 0;

  806.     }

  807.     av_dict_free(options);

  808.     *options = tmp;

  809.     return ret;

  810. }

  811. 

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

  813.                             int opt_flags, int search_flags)

  814. {

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

  816. }

  817. 

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

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

  820. {

  821.     const AVClass  *c;

  822.     const AVOption *o = NULL;

  823. 

  824.     if(!obj)

  825.         return NULL;

  826. 

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

  828. 

  829.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  830.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  831.             const AVClass *child = NULL;

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

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

  834.                     return o;

  835.         } else {

  836.             void *child = NULL;

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

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

  839.                     return o;

  840.         }

  841.     }

  842. 

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

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

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

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

  847.             if (target_obj) {

  848.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  849.                     *target_obj = obj;

  850.                 else

  851.                     *target_obj = NULL;

  852.             }

  853.             return o;

  854.         }

  855.     }

  856.     return NULL;

  857. }

  858. 

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

  860. {

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

  862.     if (c->child_next)

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

  864.     return NULL;

  865. }

  866. 

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

  868. {

  869.     if (parent->child_class_next)

  870.         return parent->child_class_next(prev);

  871.     return NULL;

  872. }

  873. 

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

  875. {

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

  877.     if(!opt)

  878.         return NULL;

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

  880. }

  881. 

  882. #ifdef TEST

  883. 

  884. #undef printf

  885. 

  886. typedef struct TestContext

  887. {

  888.     const AVClass *class;

  889.     int num;

  890.     int toggle;

  891.     char *string;

  892.     int flags;

  893.     AVRational rational;

  894.     int w, h;

  895.     enum PixelFormat pix_fmt;

  896. } TestContext;

  897. 

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

  899. 

  900. #define TEST_FLAG_COOL 01

  901. #define TEST_FLAG_LAME 02

  902. #define TEST_FLAG_MU   04

  903. 

  904. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

  913. {"size",     "set size",       OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE,{0},             0,        0                   },

  914. {"pix_fmt",  "set pixfmt",     OFFSET(pix_fmt),  AV_OPT_TYPE_PIXEL_FMT,{0},              0,        0                   },

  915. {NULL},

  916. };

  917. 

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

  919. {

  920.     return "test";

  921. }

  922. 

  923. static const AVClass test_class = {

  924.     "TestContext",

  925.     test_get_name,

  926.     test_options

  927. };

  928. 

  929. int main(void)

  930. {

  931.     int i;

  932. 

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

  934.     {

  935.         TestContext test_ctx = { 0 };

  936.         const char *options[] = {

  937.             "",

  938.             ":",

  939.             "=",

  940.             "foo=:",

  941.             ":=foo",

  942.             "=foo",

  943.             "foo=",

  944.             "foo",

  945.             "foo=val",

  946.             "foo==val",

  947.             "toggle=:",

  948.             "string=:",

  949.             "toggle=1 : foo",

  950.             "toggle=100",

  951.             "toggle==1",

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

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

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

  955.             "rational=-1/0",

  956.             "size=1024x768",

  957.             "size=pal",

  958.             "size=bogus",

  959.             "pix_fmt=yuv420p",

  960.             "pix_fmt=2",

  961.             "pix_fmt=bogus",

  962.         };

  963. 

  964.         test_ctx.class = &test_class;

  965.         av_opt_set_defaults(&test_ctx);

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

  967. 

  968.         av_log_set_level(AV_LOG_DEBUG);

  969. 

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

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

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

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

  974.             printf("\n");

  975.         }

  976.         av_freep(&test_ctx.string);

  977.     }

  978. 

  979.     return 0;

  980. }

  981. 

  982. #endif