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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 "common.h"

  31. #include "opt.h"

  32. #include "eval.h"

  33. #include "dict.h"

  34. #include "log.h"

  35. #include "parseutils.h"

  36. #include "pixdesc.h"

  37. #include "mathematics.h"

  38. 

  39. #if FF_API_FIND_OPT

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

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

  42. {

  43.     const AVOption *o = NULL;

  44. 

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

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

  47.             return o;

  48.     }

  49.     return NULL;

  50. }

  51. #endif

  52. 

  53. #if FF_API_OLD_AVOPTIONS

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

  55. {

  56.     return av_opt_next(obj, last);

  57. }

  58. #endif

  59. 

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

  61. {

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

  63.     if (!last && class->option && class->option[0].name)

  64.         return class->option;

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

  66.     return NULL;

  67. }

  68. 

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

  70. {

  71.     switch (o->type) {

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

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

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

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

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

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

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

  79.                                                         return 0;

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

  81.     }

  82.     return AVERROR(EINVAL);

  83. }

  84. 

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

  86. {

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

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

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

  90.         return AVERROR(ERANGE);

  91.     }

  92. 

  93.     switch (o->type) {

  94.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  99.     case AV_OPT_TYPE_RATIONAL:

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

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

  102.         break;

  103.     default:

  104.         return AVERROR(EINVAL);

  105.     }

  106.     return 0;

  107. }

  108. 

  109. static const double const_values[] = {

  110.     M_PI,

  111.     M_E,

  112.     FF_QP2LAMBDA,

  113.     0

  114. };

  115. 

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

  117.     "PI",

  118.     "E",

  119.     "QP2LAMBDA",

  120.     0

  121. };

  122. 

  123. static int hexchar2int(char c) {

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

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

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

  127.     return -1;

  128. }

  129. 

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

  131. {

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

  133.     uint8_t *bin, *ptr;

  134.     int len = strlen(val);

  135. 

  136.     av_freep(dst);

  137.     *lendst = 0;

  138. 

  139.     if (len & 1)

  140.         return AVERROR(EINVAL);

  141.     len /= 2;

  142. 

  143.     ptr = bin = av_malloc(len);

  144.     while (*val) {

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

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

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

  148.             av_free(bin);

  149.             return AVERROR(EINVAL);

  150.         }

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

  152.     }

  153.     *dst = bin;

  154.     *lendst = len;

  155. 

  156.     return 0;

  157. }

  158. 

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

  160. {

  161.     av_freep(dst);

  162.     *dst = av_strdup(val);

  163.     return 0;

  164. }

  165. 

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

  167. {

  168.     int ret = 0, notfirst = 0;

  169.     for (;;) {

  170.         int i, den = 1;

  171.         char buf[256];

  172.         int cmd = 0;

  173.         double d, num = 1;

  174.         int64_t intnum = 1;

  175. 

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

  177.             cmd = *(val++);

  178. 

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

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

  181.         buf[i] = 0;

  182. 

  183.         {

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

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

  186.                 d = o_named->default_val.dbl;

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

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

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

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

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

  192.             else {

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

  194.                 if (res < 0) {

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

  196.                     return res;

  197.                 }

  198.             }

  199.         }

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

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

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

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

  204.         } else {

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

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

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

  208.         }

  209. 

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

  211.             return ret;

  212.         val += i;

  213.         if (!*val)

  214.             return 0;

  215.         notfirst = 1;

  216.     }

  217. 

  218.     return 0;

  219. }

  220. 

  221. #if FF_API_OLD_AVOPTIONS

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

  223. {

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

  225.     if (o_out)

  226.         *o_out = o;

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

  228. }

  229. #endif

  230. 

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

  232. {

  233.     int ret;

  234.     void *dst, *target_obj;

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

  236.     if (!o || !target_obj)

  237.         return AVERROR_OPTION_NOT_FOUND;

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

  239.         return AVERROR(EINVAL);

  240. 

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

  242.     switch (o->type) {

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

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

  245.     case AV_OPT_TYPE_FLAGS:

  246.     case AV_OPT_TYPE_INT:

  247.     case AV_OPT_TYPE_INT64:

  248.     case AV_OPT_TYPE_FLOAT:

  249.     case AV_OPT_TYPE_DOUBLE:

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

  251.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  253.         if (ret < 0)

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

  255.         return ret;

  256.     case AV_OPT_TYPE_PIXEL_FMT:

  257.         ret = av_get_pix_fmt(val);

  258.         if (ret == PIX_FMT_NONE) {

  259.             char *tail;

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

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

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

  263.                 return AVERROR(EINVAL);

  264.             }

  265.         }

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

  267.         return 0;

  268.     }

  269. 

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

  271.     return AVERROR(EINVAL);

  272. }

  273. 

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

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

  276.     {\

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

  278.             return AVERROR(EINVAL);\

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

  280.     }

  281. 

  282. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  283. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  284. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  285. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  286. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  287. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  288. 

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

  290.                                   int search_flags)

  291. {

  292.     void *dst, *target_obj;

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

  294. 

  295.     if (!o || !target_obj)

  296.         return AVERROR_OPTION_NOT_FOUND;

  297. 

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

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

  300. }

  301. 

  302. #if FF_API_OLD_AVOPTIONS

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

  304. {

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

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

  307.         return NULL;

  308.     return o;

  309. }

  310. 

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

  312. {

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

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

  315.         return NULL;

  316.     return o;

  317. }

  318. 

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

  320. {

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

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

  323.         return NULL;

  324.     return o;

  325. }

  326. #endif

  327. 

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

  329. {

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

  331. }

  332. 

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

  334. {

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

  336. }

  337. 

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

  339. {

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

  341. }

  342. 

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

  344. {

  345.     void *target_obj;

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

  347.     uint8_t *ptr;

  348.     uint8_t **dst;

  349.     int *lendst;

  350. 

  351.     if (!o || !target_obj)

  352.         return AVERROR_OPTION_NOT_FOUND;

  353. 

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

  355.         return AVERROR(EINVAL);

  356. 

  357.     ptr = av_malloc(len);

  358.     if (!ptr)

  359.         return AVERROR(ENOMEM);

  360. 

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

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

  363. 

  364.     av_free(*dst);

  365.     *dst = ptr;

  366.     *lendst = len;

  367.     memcpy(ptr, val, len);

  368. 

  369.     return 0;

  370. }

  371. 

  372. #if FF_API_OLD_AVOPTIONS

  373. /**

  374.  *

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

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

  377.  */

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

  379. {

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

  381.     void *dst;

  382.     uint8_t *bin;

  383.     int len, i;

  384.     if (!o)

  385.         return NULL;

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

  387.         return NULL;

  388. 

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

  390.     if (o_out) *o_out= o;

  391. 

  392.     switch (o->type) {

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

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

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

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

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

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

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

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

  401.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  406.         break;

  407.     default: return NULL;

  408.     }

  409.     return buf;

  410. }

  411. #endif

  412. 

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

  414. {

  415.     void *dst, *target_obj;

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

  417.     uint8_t *bin, buf[128];

  418.     int len, i, ret;

  419. 

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

  421.         return AVERROR_OPTION_NOT_FOUND;

  422. 

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

  424. 

  425.     buf[0] = 0;

  426.     switch (o->type) {

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

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

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

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

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

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

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

  434.     case AV_OPT_TYPE_STRING:

  435.         if (*(uint8_t**)dst)

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

  437.         else

  438.             *out_val = av_strdup("");

  439.         return 0;

  440.     case AV_OPT_TYPE_BINARY:

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

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

  443.             return AVERROR(EINVAL);

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

  445.             return AVERROR(ENOMEM);

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

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

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

  449.         return 0;

  450.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  452.         break;

  453.     case AV_OPT_TYPE_PIXEL_FMT:

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

  455.         break;

  456.     default:

  457.         return AVERROR(EINVAL);

  458.     }

  459. 

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

  461.         return AVERROR(EINVAL);

  462.     *out_val = av_strdup(buf);

  463.     return 0;

  464. }

  465. 

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

  467.                       int search_flags)

  468. {

  469.     void *dst, *target_obj;

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

  471.     if (!o || !target_obj)

  472.         goto error;

  473. 

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

  475. 

  476.     if (o_out) *o_out= o;

  477. 

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

  479. 

  480. error:

  481.     *den=*intnum=0;

  482.     return -1;

  483. }

  484. 

  485. #if FF_API_OLD_AVOPTIONS

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

  487. {

  488.     int64_t intnum=1;

  489.     double num=1;

  490.     int den=1;

  491. 

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

  493.         return NAN;

  494.     return num*intnum/den;

  495. }

  496. 

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

  498. {

  499.     int64_t intnum=1;

  500.     double num=1;

  501.     int den=1;

  502. 

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

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

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

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

  507.     else

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

  509. }

  510. 

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

  512. {

  513.     int64_t intnum=1;

  514.     double num=1;

  515.     int den=1;

  516. 

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

  518.         return -1;

  519.     return num*intnum/den;

  520. }

  521. #endif

  522. 

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

  524. {

  525.     int64_t intnum = 1;

  526.     double     num = 1;

  527.     int   ret, den = 1;

  528. 

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

  530.         return ret;

  531.     *out_val = num*intnum/den;

  532.     return 0;

  533. }

  534. 

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

  536. {

  537.     int64_t intnum = 1;

  538.     double     num = 1;

  539.     int   ret, den = 1;

  540. 

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

  542.         return ret;

  543.     *out_val = num*intnum/den;

  544.     return 0;

  545. }

  546. 

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

  548. {

  549.     int64_t intnum = 1;

  550.     double     num = 1;

  551.     int   ret, den = 1;

  552. 

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

  554.         return ret;

  555. 

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

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

  558.     else

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

  560.     return 0;

  561. }

  562. 

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

  564. {

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

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

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

  568.     int64_t res;

  569. 

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

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

  572.         return 0;

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

  574. }

  575. 

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

  577.                      int req_flags, int rej_flags)

  578. {

  579.     const AVOption *opt=NULL;

  580. 

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

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

  583.             continue;

  584. 

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

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

  587.          * Only print items from the requested unit.

  588.          */

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

  590.             continue;

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

  592.             continue;

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

  594.             continue;

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

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

  597.         else

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

  599. 

  600.         switch (opt->type) {

  601.             case AV_OPT_TYPE_FLAGS:

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

  603.                 break;

  604.             case AV_OPT_TYPE_INT:

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

  606.                 break;

  607.             case AV_OPT_TYPE_INT64:

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

  609.                 break;

  610.             case AV_OPT_TYPE_DOUBLE:

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

  612.                 break;

  613.             case AV_OPT_TYPE_FLOAT:

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

  615.                 break;

  616.             case AV_OPT_TYPE_STRING:

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

  618.                 break;

  619.             case AV_OPT_TYPE_RATIONAL:

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

  621.                 break;

  622.             case AV_OPT_TYPE_BINARY:

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

  624.                 break;

  625.             case AV_OPT_TYPE_IMAGE_SIZE:

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

  627.                 break;

  628.             case AV_OPT_TYPE_PIXEL_FMT:

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

  630.                 break;

  631.             case AV_OPT_TYPE_CONST:

  632.             default:

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

  634.                 break;

  635.         }

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

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

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

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

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

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

  642. 

  643.         if (opt->help)

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

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

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

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

  648.         }

  649.     }

  650. }

  651. 

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

  653. {

  654.     if (!obj)

  655.         return -1;

  656. 

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

  658. 

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

  660. 

  661.     return 0;

  662. }

  663. 

  664. void av_opt_set_defaults(void *s)

  665. {

  666. #if FF_API_OLD_AVOPTIONS

  667.     av_opt_set_defaults2(s, 0, 0);

  668. }

  669. 

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

  671. {

  672. #endif

  673.     const AVOption *opt = NULL;

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

  675. #if FF_API_OLD_AVOPTIONS

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

  677.             continue;

  678. #endif

  679.         switch (opt->type) {

  680.             case AV_OPT_TYPE_CONST:

  681.                 /* Nothing to be done here */

  682.             break;

  683.             case AV_OPT_TYPE_FLAGS:

  684.             case AV_OPT_TYPE_INT: {

  685.                 int val;

  686.                 val = opt->default_val.dbl;

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

  688.             }

  689.             break;

  690.             case AV_OPT_TYPE_INT64:

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

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

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

  694.             break;

  695.             case AV_OPT_TYPE_DOUBLE:

  696.             case AV_OPT_TYPE_FLOAT: {

  697.                 double val;

  698.                 val = opt->default_val.dbl;

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

  700.             }

  701.             break;

  702.             case AV_OPT_TYPE_RATIONAL: {

  703.                 AVRational val;

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

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

  706.             }

  707.             break;

  708.             case AV_OPT_TYPE_STRING:

  709.             case AV_OPT_TYPE_IMAGE_SIZE:

  710.             case AV_OPT_TYPE_PIXEL_FMT:

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

  712.                 break;

  713.             case AV_OPT_TYPE_BINARY:

  714.                 /* Cannot set default for binary */

  715.             break;

  716.             default:

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

  718.         }

  719.     }

  720. }

  721. 

  722. /**

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

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

  725.  *

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

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

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

  729.  * separate key from value

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

  731.  * two pairs from each other

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

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

  734.  * of error:

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

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

  737.  * cannot be set

  738.  */

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

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

  741. {

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

  743.     char *val;

  744.     int ret;

  745. 

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

  747.         (*buf)++;

  748.         val = av_get_token(buf, pairs_sep);

  749.     } else {

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

  751.         av_free(key);

  752.         return AVERROR(EINVAL);

  753.     }

  754. 

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

  756. 

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

  758.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  760. 

  761.     av_free(key);

  762.     av_free(val);

  763.     return ret;

  764. }

  765. 

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

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

  768. {

  769.     int ret, count = 0;

  770. 

  771.     if (!opts)

  772.         return 0;

  773. 

  774.     while (*opts) {

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

  776.             return ret;

  777.         count++;

  778. 

  779.         if (*opts)

  780.             opts++;

  781.     }

  782. 

  783.     return count;

  784. }

  785. 

  786. void av_opt_free(void *obj)

  787. {

  788.     const AVOption *o = NULL;

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

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

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

  792. }

  793. 

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

  795. {

  796.     AVDictionaryEntry *t = NULL;

  797.     AVDictionary    *tmp = NULL;

  798.     int ret = 0;

  799. 

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

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

  802.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  804.         else if (ret < 0) {

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

  806.             break;

  807.         }

  808.         ret = 0;

  809.     }

  810.     av_dict_free(options);

  811.     *options = tmp;

  812.     return ret;

  813. }

  814. 

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

  816.                             int opt_flags, int search_flags)

  817. {

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

  819. }

  820. 

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

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

  823. {

  824.     const AVClass  *c;

  825.     const AVOption *o = NULL;

  826. 

  827.     if(!obj)

  828.         return NULL;

  829. 

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

  831. 

  832.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  833.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  834.             const AVClass *child = NULL;

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

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

  837.                     return o;

  838.         } else {

  839.             void *child = NULL;

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

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

  842.                     return o;

  843.         }

  844.     }

  845. 

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

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

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

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

  850.             if (target_obj) {

  851.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  852.                     *target_obj = obj;

  853.                 else

  854.                     *target_obj = NULL;

  855.             }

  856.             return o;

  857.         }

  858.     }

  859.     return NULL;

  860. }

  861. 

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

  863. {

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

  865.     if (c->child_next)

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

  867.     return NULL;

  868. }

  869. 

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

  871. {

  872.     if (parent->child_class_next)

  873.         return parent->child_class_next(prev);

  874.     return NULL;

  875. }

  876. 

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

  878. {

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

  880.     if(!opt)

  881.         return NULL;

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

  883. }

  884. 

  885. #ifdef TEST

  886. 

  887. #undef printf

  888. 

  889. typedef struct TestContext

  890. {

  891.     const AVClass *class;

  892.     int num;

  893.     int toggle;

  894.     char *string;

  895.     int flags;

  896.     AVRational rational;

  897.     int w, h;

  898.     enum PixelFormat pix_fmt;

  899. } TestContext;

  900. 

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

  902. 

  903. #define TEST_FLAG_COOL 01

  904. #define TEST_FLAG_LAME 02

  905. #define TEST_FLAG_MU   04

  906. 

  907. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

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

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

  918. {NULL},

  919. };

  920. 

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

  922. {

  923.     return "test";

  924. }

  925. 

  926. static const AVClass test_class = {

  927.     "TestContext",

  928.     test_get_name,

  929.     test_options

  930. };

  931. 

  932. int main(void)

  933. {

  934.     int i;

  935. 

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

  937.     {

  938.         TestContext test_ctx = { 0 };

  939.         const char *options[] = {

  940.             "",

  941.             ":",

  942.             "=",

  943.             "foo=:",

  944.             ":=foo",

  945.             "=foo",

  946.             "foo=",

  947.             "foo",

  948.             "foo=val",

  949.             "foo==val",

  950.             "toggle=:",

  951.             "string=:",

  952.             "toggle=1 : foo",

  953.             "toggle=100",

  954.             "toggle==1",

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

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

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

  958.             "rational=-1/0",

  959.             "size=1024x768",

  960.             "size=pal",

  961.             "size=bogus",

  962.             "pix_fmt=yuv420p",

  963.             "pix_fmt=2",

  964.             "pix_fmt=bogus",

  965.         };

  966. 

  967.         test_ctx.class = &test_class;

  968.         av_opt_set_defaults(&test_ctx);

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

  970. 

  971.         av_log_set_level(AV_LOG_DEBUG);

  972. 

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

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

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

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

  977.             printf("\n");

  978.         }

  979.         av_freep(&test_ctx.string);

  980.     }

  981. 

  982.     return 0;

  983. }

  984. 

  985. #endif