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

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

  168. 

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

  170. {

  171.     int ret = 0, notfirst = 0;

  172.     for (;;) {

  173.         int i, den = 1;

  174.         char buf[256];

  175.         int cmd = 0;

  176.         double d, num = 1;

  177.         int64_t intnum = 1;

  178. 

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

  180.             cmd = *(val++);

  181. 

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

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

  184.         buf[i] = 0;

  185. 

  186.         {

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

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

  189.                 d = DEFAULT_NUMVAL(o_named);

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

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

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

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

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

  195.             else {

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

  197.                 if (res < 0) {

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

  199.                     return res;

  200.                 }

  201.             }

  202.         }

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

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

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

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

  207.         } else {

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

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

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

  211.         }

  212. 

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

  214.             return ret;

  215.         val += i;

  216.         if (!*val)

  217.             return 0;

  218.         notfirst = 1;

  219.     }

  220. 

  221.     return 0;

  222. }

  223. 

  224. #if FF_API_OLD_AVOPTIONS

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

  226. {

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

  228.     if (o_out)

  229.         *o_out = o;

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

  231. }

  232. #endif

  233. 

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

  235. {

  236.     int ret;

  237.     void *dst, *target_obj;

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

  239.     if (!o || !target_obj)

  240.         return AVERROR_OPTION_NOT_FOUND;

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

  242.         return AVERROR(EINVAL);

  243. 

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

  245.     switch (o->type) {

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

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

  248.     case AV_OPT_TYPE_FLAGS:

  249.     case AV_OPT_TYPE_INT:

  250.     case AV_OPT_TYPE_INT64:

  251.     case AV_OPT_TYPE_FLOAT:

  252.     case AV_OPT_TYPE_DOUBLE:

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

  254.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  256.         if (ret < 0)

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

  258.         return ret;

  259.     case AV_OPT_TYPE_PIXEL_FMT:

  260.         ret = av_get_pix_fmt(val);

  261.         if (ret == PIX_FMT_NONE) {

  262.             char *tail;

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

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

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

  266.                 return AVERROR(EINVAL);

  267.             }

  268.         }

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

  270.         return 0;

  271.     }

  272. 

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

  274.     return AVERROR(EINVAL);

  275. }

  276. 

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

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

  279.     {\

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

  281.             return AVERROR(EINVAL);\

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

  283.     }

  284. 

  285. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  286. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  287. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  288. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  289. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  290. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  291. 

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

  293.                                   int search_flags)

  294. {

  295.     void *dst, *target_obj;

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

  297. 

  298.     if (!o || !target_obj)

  299.         return AVERROR_OPTION_NOT_FOUND;

  300. 

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

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

  303. }

  304. 

  305. #if FF_API_OLD_AVOPTIONS

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

  307. {

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

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

  310.         return NULL;

  311.     return o;

  312. }

  313. 

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

  315. {

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

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

  318.         return NULL;

  319.     return o;

  320. }

  321. 

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

  323. {

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

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

  326.         return NULL;

  327.     return o;

  328. }

  329. #endif

  330. 

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

  332. {

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

  334. }

  335. 

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

  337. {

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

  339. }

  340. 

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

  342. {

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

  344. }

  345. 

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

  347. {

  348.     void *target_obj;

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

  350.     uint8_t *ptr;

  351.     uint8_t **dst;

  352.     int *lendst;

  353. 

  354.     if (!o || !target_obj)

  355.         return AVERROR_OPTION_NOT_FOUND;

  356. 

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

  358.         return AVERROR(EINVAL);

  359. 

  360.     ptr = av_malloc(len);

  361.     if (!ptr)

  362.         return AVERROR(ENOMEM);

  363. 

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

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

  366. 

  367.     av_free(*dst);

  368.     *dst = ptr;

  369.     *lendst = len;

  370.     memcpy(ptr, val, len);

  371. 

  372.     return 0;

  373. }

  374. 

  375. #if FF_API_OLD_AVOPTIONS

  376. /**

  377.  *

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

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

  380.  */

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

  382. {

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

  384.     void *dst;

  385.     uint8_t *bin;

  386.     int len, i;

  387.     if (!o)

  388.         return NULL;

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

  390.         return NULL;

  391. 

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

  393.     if (o_out) *o_out= o;

  394. 

  395.     switch (o->type) {

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

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

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

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

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

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

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

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

  404.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  409.         break;

  410.     default: return NULL;

  411.     }

  412.     return buf;

  413. }

  414. #endif

  415. 

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

  417. {

  418.     void *dst, *target_obj;

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

  420.     uint8_t *bin, buf[128];

  421.     int len, i, ret;

  422. 

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

  424.         return AVERROR_OPTION_NOT_FOUND;

  425. 

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

  427. 

  428.     buf[0] = 0;

  429.     switch (o->type) {

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

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

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

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

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

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

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

  437.     case AV_OPT_TYPE_STRING:

  438.         if (*(uint8_t**)dst)

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

  440.         else

  441.             *out_val = av_strdup("");

  442.         return 0;

  443.     case AV_OPT_TYPE_BINARY:

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

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

  446.             return AVERROR(EINVAL);

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

  448.             return AVERROR(ENOMEM);

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

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

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

  452.         return 0;

  453.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  455.         break;

  456.     case AV_OPT_TYPE_PIXEL_FMT:

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

  458.         break;

  459.     default:

  460.         return AVERROR(EINVAL);

  461.     }

  462. 

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

  464.         return AVERROR(EINVAL);

  465.     *out_val = av_strdup(buf);

  466.     return 0;

  467. }

  468. 

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

  470.                       int search_flags)

  471. {

  472.     void *dst, *target_obj;

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

  474.     if (!o || !target_obj)

  475.         goto error;

  476. 

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

  478. 

  479.     if (o_out) *o_out= o;

  480. 

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

  482. 

  483. error:

  484.     *den=*intnum=0;

  485.     return -1;

  486. }

  487. 

  488. #if FF_API_OLD_AVOPTIONS

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

  490. {

  491.     int64_t intnum=1;

  492.     double num=1;

  493.     int den=1;

  494. 

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

  496.         return NAN;

  497.     return num*intnum/den;

  498. }

  499. 

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

  501. {

  502.     int64_t intnum=1;

  503.     double num=1;

  504.     int den=1;

  505. 

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

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

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

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

  510.     else

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

  512. }

  513. 

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

  515. {

  516.     int64_t intnum=1;

  517.     double num=1;

  518.     int den=1;

  519. 

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

  521.         return -1;

  522.     return num*intnum/den;

  523. }

  524. #endif

  525. 

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

  527. {

  528.     int64_t intnum = 1;

  529.     double     num = 1;

  530.     int   ret, den = 1;

  531. 

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

  533.         return ret;

  534.     *out_val = num*intnum/den;

  535.     return 0;

  536. }

  537. 

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

  539. {

  540.     int64_t intnum = 1;

  541.     double     num = 1;

  542.     int   ret, den = 1;

  543. 

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

  545.         return ret;

  546.     *out_val = num*intnum/den;

  547.     return 0;

  548. }

  549. 

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

  551. {

  552.     int64_t intnum = 1;

  553.     double     num = 1;

  554.     int   ret, den = 1;

  555. 

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

  557.         return ret;

  558. 

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

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

  561.     else

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

  563.     return 0;

  564. }

  565. 

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

  567. {

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

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

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

  571.     int64_t res;

  572. 

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

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

  575.         return 0;

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

  577. }

  578. 

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

  580.                      int req_flags, int rej_flags)

  581. {

  582.     const AVOption *opt=NULL;

  583. 

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

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

  586.             continue;

  587. 

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

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

  590.          * Only print items from the requested unit.

  591.          */

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

  593.             continue;

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

  595.             continue;

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

  597.             continue;

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

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

  600.         else

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

  602. 

  603.         switch (opt->type) {

  604.             case AV_OPT_TYPE_FLAGS:

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

  606.                 break;

  607.             case AV_OPT_TYPE_INT:

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

  609.                 break;

  610.             case AV_OPT_TYPE_INT64:

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

  612.                 break;

  613.             case AV_OPT_TYPE_DOUBLE:

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

  615.                 break;

  616.             case AV_OPT_TYPE_FLOAT:

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

  618.                 break;

  619.             case AV_OPT_TYPE_STRING:

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

  621.                 break;

  622.             case AV_OPT_TYPE_RATIONAL:

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

  624.                 break;

  625.             case AV_OPT_TYPE_BINARY:

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

  627.                 break;

  628.             case AV_OPT_TYPE_IMAGE_SIZE:

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

  630.                 break;

  631.             case AV_OPT_TYPE_PIXEL_FMT:

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

  633.                 break;

  634.             case AV_OPT_TYPE_CONST:

  635.             default:

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

  637.                 break;

  638.         }

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

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

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

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

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

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

  645. 

  646.         if (opt->help)

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

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

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

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

  651.         }

  652.     }

  653. }

  654. 

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

  656. {

  657.     if (!obj)

  658.         return -1;

  659. 

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

  661. 

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

  663. 

  664.     return 0;

  665. }

  666. 

  667. void av_opt_set_defaults(void *s)

  668. {

  669. #if FF_API_OLD_AVOPTIONS

  670.     av_opt_set_defaults2(s, 0, 0);

  671. }

  672. 

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

  674. {

  675. #endif

  676.     const AVOption *opt = NULL;

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

  678. #if FF_API_OLD_AVOPTIONS

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

  680.             continue;

  681. #endif

  682.         switch (opt->type) {

  683.             case AV_OPT_TYPE_CONST:

  684.                 /* Nothing to be done here */

  685.             break;

  686.             case AV_OPT_TYPE_FLAGS:

  687.             case AV_OPT_TYPE_INT: {

  688.                 int val;

  689.                 val = opt->default_val.dbl;

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

  691.             }

  692.             break;

  693.             case AV_OPT_TYPE_INT64:

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

  695.             break;

  696.             case AV_OPT_TYPE_DOUBLE:

  697.             case AV_OPT_TYPE_FLOAT: {

  698.                 double val;

  699.                 val = opt->default_val.dbl;

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

  701.             }

  702.             break;

  703.             case AV_OPT_TYPE_RATIONAL: {

  704.                 AVRational val;

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

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

  707.             }

  708.             break;

  709.             case AV_OPT_TYPE_STRING:

  710.             case AV_OPT_TYPE_IMAGE_SIZE:

  711.             case AV_OPT_TYPE_PIXEL_FMT:

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

  713.                 break;

  714.             case AV_OPT_TYPE_BINARY:

  715.                 /* Cannot set default for binary */

  716.             break;

  717.             default:

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

  719.         }

  720.     }

  721. }

  722. 

  723. /**

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

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

  726.  *

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

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

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

  730.  * separate key from value

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

  732.  * two pairs from each other

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

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

  735.  * of error:

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

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

  738.  * cannot be set

  739.  */

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

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

  742. {

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

  744.     char *val;

  745.     int ret;

  746. 

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

  748.         (*buf)++;

  749.         val = av_get_token(buf, pairs_sep);

  750.     } else {

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

  752.         av_free(key);

  753.         return AVERROR(EINVAL);

  754.     }

  755. 

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

  757. 

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

  759.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  761. 

  762.     av_free(key);

  763.     av_free(val);

  764.     return ret;

  765. }

  766. 

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

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

  769. {

  770.     int ret, count = 0;

  771. 

  772.     if (!opts)

  773.         return 0;

  774. 

  775.     while (*opts) {

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

  777.             return ret;

  778.         count++;

  779. 

  780.         if (*opts)

  781.             opts++;

  782.     }

  783. 

  784.     return count;

  785. }

  786. 

  787. void av_opt_free(void *obj)

  788. {

  789.     const AVOption *o = NULL;

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

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

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

  793. }

  794. 

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

  796. {

  797.     AVDictionaryEntry *t = NULL;

  798.     AVDictionary    *tmp = NULL;

  799.     int ret = 0;

  800. 

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

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

  803.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  805.         else if (ret < 0) {

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

  807.             break;

  808.         }

  809.         ret = 0;

  810.     }

  811.     av_dict_free(options);

  812.     *options = tmp;

  813.     return ret;

  814. }

  815. 

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

  817.                             int opt_flags, int search_flags)

  818. {

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

  820. }

  821. 

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

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

  824. {

  825.     const AVClass  *c;

  826.     const AVOption *o = NULL;

  827. 

  828.     if(!obj)

  829.         return NULL;

  830. 

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

  832. 

  833.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  834.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  835.             const AVClass *child = NULL;

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

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

  838.                     return o;

  839.         } else {

  840.             void *child = NULL;

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

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

  843.                     return o;

  844.         }

  845.     }

  846. 

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

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

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

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

  851.             if (target_obj) {

  852.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  853.                     *target_obj = obj;

  854.                 else

  855.                     *target_obj = NULL;

  856.             }

  857.             return o;

  858.         }

  859.     }

  860.     return NULL;

  861. }

  862. 

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

  864. {

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

  866.     if (c->child_next)

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

  868.     return NULL;

  869. }

  870. 

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

  872. {

  873.     if (parent->child_class_next)

  874.         return parent->child_class_next(prev);

  875.     return NULL;

  876. }

  877. 

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

  879. {

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

  881.     if(!opt)

  882.         return NULL;

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

  884. }

  885. 

  886. #ifdef TEST

  887. 

  888. #undef printf

  889. 

  890. typedef struct TestContext

  891. {

  892.     const AVClass *class;

  893.     int num;

  894.     int toggle;

  895.     char *string;

  896.     int flags;

  897.     AVRational rational;

  898.     int w, h;

  899.     enum PixelFormat pix_fmt;

  900. } TestContext;

  901. 

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

  903. 

  904. #define TEST_FLAG_COOL 01

  905. #define TEST_FLAG_LAME 02

  906. #define TEST_FLAG_MU   04

  907. 

  908. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

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

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

  919. {NULL},

  920. };

  921. 

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

  923. {

  924.     return "test";

  925. }

  926. 

  927. static const AVClass test_class = {

  928.     "TestContext",

  929.     test_get_name,

  930.     test_options

  931. };

  932. 

  933. int main(void)

  934. {

  935.     int i;

  936. 

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

  938.     {

  939.         TestContext test_ctx = { 0 };

  940.         const char *options[] = {

  941.             "",

  942.             ":",

  943.             "=",

  944.             "foo=:",

  945.             ":=foo",

  946.             "=foo",

  947.             "foo=",

  948.             "foo",

  949.             "foo=val",

  950.             "foo==val",

  951.             "toggle=:",

  952.             "string=:",

  953.             "toggle=1 : foo",

  954.             "toggle=100",

  955.             "toggle==1",

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

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

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

  959.             "rational=-1/0",

  960.             "size=1024x768",

  961.             "size=pal",

  962.             "size=bogus",

  963.             "pix_fmt=yuv420p",

  964.             "pix_fmt=2",

  965.             "pix_fmt=bogus",

  966.         };

  967. 

  968.         test_ctx.class = &test_class;

  969.         av_opt_set_defaults(&test_ctx);

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

  971. 

  972.         av_log_set_level(AV_LOG_DEBUG);

  973. 

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

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

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

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

  978.             printf("\n");

  979.         }

  980.         av_freep(&test_ctx.string);

  981.     }

  982. 

  983.     return 0;

  984. }

  985. 

  986. #endif