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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 && class->option[0].name)

  63.         return class->option;

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

  65.     return NULL;

  66. }

  67. 

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

  69. {

  70.     switch (o->type) {

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

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

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

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

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

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

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

  78.                                                         return 0;

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

  80.     }

  81.     return AVERROR(EINVAL);

  82. }

  83. 

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

  85. {

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

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

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

  89.         return AVERROR(ERANGE);

  90.     }

  91. 

  92.     switch (o->type) {

  93.     case AV_OPT_TYPE_FLAGS:

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

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

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

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

  98.     case AV_OPT_TYPE_RATIONAL:

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

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

  101.         break;

  102.     default:

  103.         return AVERROR(EINVAL);

  104.     }

  105.     return 0;

  106. }

  107. 

  108. static const double const_values[] = {

  109.     M_PI,

  110.     M_E,

  111.     FF_QP2LAMBDA,

  112.     0

  113. };

  114. 

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

  116.     "PI",

  117.     "E",

  118.     "QP2LAMBDA",

  119.     0

  120. };

  121. 

  122. static int hexchar2int(char c) {

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

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

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

  126.     return -1;

  127. }

  128. 

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

  130. {

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

  132.     uint8_t *bin, *ptr;

  133.     int len = strlen(val);

  134. 

  135.     av_freep(dst);

  136.     *lendst = 0;

  137. 

  138.     if (len & 1)

  139.         return AVERROR(EINVAL);

  140.     len /= 2;

  141. 

  142.     ptr = bin = av_malloc(len);

  143.     while (*val) {

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

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

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

  147.             av_free(bin);

  148.             return AVERROR(EINVAL);

  149.         }

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

  151.     }

  152.     *dst = bin;

  153.     *lendst = len;

  154. 

  155.     return 0;

  156. }

  157. 

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

  159. {

  160.     av_freep(dst);

  161.     *dst = av_strdup(val);

  162.     return 0;

  163. }

  164. 

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

  166. {

  167.     int ret = 0, notfirst = 0;

  168.     for (;;) {

  169.         int i, den = 1;

  170.         char buf[256];

  171.         int cmd = 0;

  172.         double d, num = 1;

  173.         int64_t intnum = 1;

  174. 

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

  176.             cmd = *(val++);

  177. 

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

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

  180.         buf[i] = 0;

  181. 

  182.         {

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

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

  185.                 d = o_named->default_val.dbl;

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

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

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

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

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

  191.             else {

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

  193.                 if (res < 0) {

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

  195.                     return res;

  196.                 }

  197.             }

  198.         }

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

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

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

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

  203.         } else {

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

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

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

  207.         }

  208. 

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

  210.             return ret;

  211.         val += i;

  212.         if (!*val)

  213.             return 0;

  214.         notfirst = 1;

  215.     }

  216. 

  217.     return 0;

  218. }

  219. 

  220. #if FF_API_OLD_AVOPTIONS

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

  222. {

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

  224.     if (o_out)

  225.         *o_out = o;

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

  227. }

  228. #endif

  229. 

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

  231. {

  232.     int ret;

  233.     void *dst, *target_obj;

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

  235.     if (!o || !target_obj)

  236.         return AVERROR_OPTION_NOT_FOUND;

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

  238.         return AVERROR(EINVAL);

  239. 

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

  241.     switch (o->type) {

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

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

  244.     case AV_OPT_TYPE_FLAGS:

  245.     case AV_OPT_TYPE_INT:

  246.     case AV_OPT_TYPE_INT64:

  247.     case AV_OPT_TYPE_FLOAT:

  248.     case AV_OPT_TYPE_DOUBLE:

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

  250.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  252.         if (ret < 0)

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

  254.         return ret;

  255.     case AV_OPT_TYPE_PIXEL_FMT:

  256.         ret = av_get_pix_fmt(val);

  257.         if (ret == PIX_FMT_NONE) {

  258.             char *tail;

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

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

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

  262.                 return AVERROR(EINVAL);

  263.             }

  264.         }

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

  266.         return 0;

  267.     }

  268. 

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

  270.     return AVERROR(EINVAL);

  271. }

  272. 

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

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

  275.     {\

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

  277.             return AVERROR(EINVAL);\

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

  279.     }

  280. 

  281. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  282. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  283. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  284. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  285. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  286. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  287. 

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

  289.                                   int search_flags)

  290. {

  291.     void *dst, *target_obj;

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

  293. 

  294.     if (!o || !target_obj)

  295.         return AVERROR_OPTION_NOT_FOUND;

  296. 

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

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

  299. }

  300. 

  301. #if FF_API_OLD_AVOPTIONS

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

  303. {

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

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

  306.         return NULL;

  307.     return o;

  308. }

  309. 

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

  311. {

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

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

  314.         return NULL;

  315.     return o;

  316. }

  317. 

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

  319. {

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

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

  322.         return NULL;

  323.     return o;

  324. }

  325. #endif

  326. 

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

  328. {

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

  330. }

  331. 

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

  333. {

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

  335. }

  336. 

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

  338. {

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

  340. }

  341. 

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

  343. {

  344.     void *target_obj;

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

  346.     uint8_t *ptr;

  347.     uint8_t **dst;

  348.     int *lendst;

  349. 

  350.     if (!o || !target_obj)

  351.         return AVERROR_OPTION_NOT_FOUND;

  352. 

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

  354.         return AVERROR(EINVAL);

  355. 

  356.     ptr = av_malloc(len);

  357.     if (!ptr)

  358.         return AVERROR(ENOMEM);

  359. 

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

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

  362. 

  363.     av_free(*dst);

  364.     *dst = ptr;

  365.     *lendst = len;

  366.     memcpy(ptr, val, len);

  367. 

  368.     return 0;

  369. }

  370. 

  371. #if FF_API_OLD_AVOPTIONS

  372. /**

  373.  *

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

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

  376.  */

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

  378. {

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

  380.     void *dst;

  381.     uint8_t *bin;

  382.     int len, i;

  383.     if (!o)

  384.         return NULL;

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

  386.         return NULL;

  387. 

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

  389.     if (o_out) *o_out= o;

  390. 

  391.     switch (o->type) {

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

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

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

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

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

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

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

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

  400.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  405.         break;

  406.     default: return NULL;

  407.     }

  408.     return buf;

  409. }

  410. #endif

  411. 

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

  413. {

  414.     void *dst, *target_obj;

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

  416.     uint8_t *bin, buf[128];

  417.     int len, i, ret;

  418. 

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

  420.         return AVERROR_OPTION_NOT_FOUND;

  421. 

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

  423. 

  424.     buf[0] = 0;

  425.     switch (o->type) {

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

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

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

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

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

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

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

  433.     case AV_OPT_TYPE_STRING:

  434.         if (*(uint8_t**)dst)

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

  436.         else

  437.             *out_val = av_strdup("");

  438.         return 0;

  439.     case AV_OPT_TYPE_BINARY:

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

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

  442.             return AVERROR(EINVAL);

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

  444.             return AVERROR(ENOMEM);

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

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

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

  448.         return 0;

  449.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  451.         break;

  452.     case AV_OPT_TYPE_PIXEL_FMT:

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

  454.         break;

  455.     default:

  456.         return AVERROR(EINVAL);

  457.     }

  458. 

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

  460.         return AVERROR(EINVAL);

  461.     *out_val = av_strdup(buf);

  462.     return 0;

  463. }

  464. 

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

  466.                       int search_flags)

  467. {

  468.     void *dst, *target_obj;

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

  470.     if (!o || !target_obj)

  471.         goto error;

  472. 

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

  474. 

  475.     if (o_out) *o_out= o;

  476. 

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

  478. 

  479. error:

  480.     *den=*intnum=0;

  481.     return -1;

  482. }

  483. 

  484. #if FF_API_OLD_AVOPTIONS

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

  486. {

  487.     int64_t intnum=1;

  488.     double num=1;

  489.     int den=1;

  490. 

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

  492.         return NAN;

  493.     return num*intnum/den;

  494. }

  495. 

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

  497. {

  498.     int64_t intnum=1;

  499.     double num=1;

  500.     int den=1;

  501. 

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

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

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

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

  506.     else

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

  508. }

  509. 

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

  511. {

  512.     int64_t intnum=1;

  513.     double num=1;

  514.     int den=1;

  515. 

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

  517.         return -1;

  518.     return num*intnum/den;

  519. }

  520. #endif

  521. 

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

  523. {

  524.     int64_t intnum = 1;

  525.     double     num = 1;

  526.     int   ret, den = 1;

  527. 

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

  529.         return ret;

  530.     *out_val = num*intnum/den;

  531.     return 0;

  532. }

  533. 

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

  535. {

  536.     int64_t intnum = 1;

  537.     double     num = 1;

  538.     int   ret, den = 1;

  539. 

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

  541.         return ret;

  542.     *out_val = num*intnum/den;

  543.     return 0;

  544. }

  545. 

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

  547. {

  548.     int64_t intnum = 1;

  549.     double     num = 1;

  550.     int   ret, den = 1;

  551. 

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

  553.         return ret;

  554. 

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

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

  557.     else

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

  559.     return 0;

  560. }

  561. 

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

  563. {

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

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

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

  567.     int64_t res;

  568. 

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

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

  571.         return 0;

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

  573. }

  574. 

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

  576.                      int req_flags, int rej_flags)

  577. {

  578.     const AVOption *opt=NULL;

  579. 

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

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

  582.             continue;

  583. 

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

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

  586.          * Only print items from the requested unit.

  587.          */

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

  589.             continue;

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

  591.             continue;

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

  593.             continue;

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

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

  596.         else

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

  598. 

  599.         switch (opt->type) {

  600.             case AV_OPT_TYPE_FLAGS:

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

  602.                 break;

  603.             case AV_OPT_TYPE_INT:

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

  605.                 break;

  606.             case AV_OPT_TYPE_INT64:

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

  608.                 break;

  609.             case AV_OPT_TYPE_DOUBLE:

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

  611.                 break;

  612.             case AV_OPT_TYPE_FLOAT:

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

  614.                 break;

  615.             case AV_OPT_TYPE_STRING:

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

  617.                 break;

  618.             case AV_OPT_TYPE_RATIONAL:

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

  620.                 break;

  621.             case AV_OPT_TYPE_BINARY:

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

  623.                 break;

  624.             case AV_OPT_TYPE_IMAGE_SIZE:

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

  626.                 break;

  627.             case AV_OPT_TYPE_PIXEL_FMT:

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

  629.                 break;

  630.             case AV_OPT_TYPE_CONST:

  631.             default:

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

  633.                 break;

  634.         }

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

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

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

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

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

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

  641. 

  642.         if (opt->help)

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

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

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

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

  647.         }

  648.     }

  649. }

  650. 

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

  652. {

  653.     if (!obj)

  654.         return -1;

  655. 

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

  657. 

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

  659. 

  660.     return 0;

  661. }

  662. 

  663. void av_opt_set_defaults(void *s)

  664. {

  665. #if FF_API_OLD_AVOPTIONS

  666.     av_opt_set_defaults2(s, 0, 0);

  667. }

  668. 

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

  670. {

  671. #endif

  672.     const AVOption *opt = NULL;

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

  674. #if FF_API_OLD_AVOPTIONS

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

  676.             continue;

  677. #endif

  678.         switch (opt->type) {

  679.             case AV_OPT_TYPE_CONST:

  680.                 /* Nothing to be done here */

  681.             break;

  682.             case AV_OPT_TYPE_FLAGS:

  683.             case AV_OPT_TYPE_INT: {

  684.                 int val;

  685.                 val = opt->default_val.dbl;

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

  687.             }

  688.             break;

  689.             case AV_OPT_TYPE_INT64:

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

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

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

  693.             break;

  694.             case AV_OPT_TYPE_DOUBLE:

  695.             case AV_OPT_TYPE_FLOAT: {

  696.                 double val;

  697.                 val = opt->default_val.dbl;

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

  699.             }

  700.             break;

  701.             case AV_OPT_TYPE_RATIONAL: {

  702.                 AVRational val;

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

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

  705.             }

  706.             break;

  707.             case AV_OPT_TYPE_STRING:

  708.             case AV_OPT_TYPE_IMAGE_SIZE:

  709.             case AV_OPT_TYPE_PIXEL_FMT:

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

  711.                 break;

  712.             case AV_OPT_TYPE_BINARY:

  713.                 /* Cannot set default for binary */

  714.             break;

  715.             default:

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

  717.         }

  718.     }

  719. }

  720. 

  721. /**

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

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

  724.  *

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

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

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

  728.  * separate key from value

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

  730.  * two pairs from each other

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

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

  733.  * of error:

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

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

  736.  * cannot be set

  737.  */

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

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

  740. {

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

  742.     char *val;

  743.     int ret;

  744. 

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

  746.         (*buf)++;

  747.         val = av_get_token(buf, pairs_sep);

  748.     } else {

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

  750.         av_free(key);

  751.         return AVERROR(EINVAL);

  752.     }

  753. 

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

  755. 

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

  757.     if (ret == AVERROR_OPTION_NOT_FOUND)

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

  759. 

  760.     av_free(key);

  761.     av_free(val);

  762.     return ret;

  763. }

  764. 

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

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

  767. {

  768.     int ret, count = 0;

  769. 

  770.     if (!opts)

  771.         return 0;

  772. 

  773.     while (*opts) {

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

  775.             return ret;

  776.         count++;

  777. 

  778.         if (*opts)

  779.             opts++;

  780.     }

  781. 

  782.     return count;

  783. }

  784. 

  785. void av_opt_free(void *obj)

  786. {

  787.     const AVOption *o = NULL;

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

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

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

  791. }

  792. 

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

  794. {

  795.     AVDictionaryEntry *t = NULL;

  796.     AVDictionary    *tmp = NULL;

  797.     int ret = 0;

  798. 

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

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

  801.         if (ret == AVERROR_OPTION_NOT_FOUND)

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

  803.         else if (ret < 0) {

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

  805.             break;

  806.         }

  807.         ret = 0;

  808.     }

  809.     av_dict_free(options);

  810.     *options = tmp;

  811.     return ret;

  812. }

  813. 

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

  815.                             int opt_flags, int search_flags)

  816. {

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

  818. }

  819. 

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

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

  822. {

  823.     const AVClass  *c;

  824.     const AVOption *o = NULL;

  825. 

  826.     if(!obj)

  827.         return NULL;

  828. 

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

  830. 

  831.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  832.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  833.             const AVClass *child = NULL;

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

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

  836.                     return o;

  837.         } else {

  838.             void *child = NULL;

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

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

  841.                     return o;

  842.         }

  843.     }

  844. 

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

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

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

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

  849.             if (target_obj) {

  850.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  851.                     *target_obj = obj;

  852.                 else

  853.                     *target_obj = NULL;

  854.             }

  855.             return o;

  856.         }

  857.     }

  858.     return NULL;

  859. }

  860. 

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

  862. {

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

  864.     if (c->child_next)

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

  866.     return NULL;

  867. }

  868. 

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

  870. {

  871.     if (parent->child_class_next)

  872.         return parent->child_class_next(prev);

  873.     return NULL;

  874. }

  875. 

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

  877. {

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

  879.     if(!opt)

  880.         return NULL;

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

  882. }

  883. 

  884. #ifdef TEST

  885. 

  886. #undef printf

  887. 

  888. typedef struct TestContext

  889. {

  890.     const AVClass *class;

  891.     int num;

  892.     int toggle;

  893.     char *string;

  894.     int flags;

  895.     AVRational rational;

  896.     int w, h;

  897.     enum PixelFormat pix_fmt;

  898. } TestContext;

  899. 

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

  901. 

  902. #define TEST_FLAG_COOL 01

  903. #define TEST_FLAG_LAME 02

  904. #define TEST_FLAG_MU   04

  905. 

  906. static const AVOption test_options[]= {

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

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

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

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

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

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

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

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

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

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

  917. {NULL},

  918. };

  919. 

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

  921. {

  922.     return "test";

  923. }

  924. 

  925. static const AVClass test_class = {

  926.     "TestContext",

  927.     test_get_name,

  928.     test_options

  929. };

  930. 

  931. int main(void)

  932. {

  933.     int i;

  934. 

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

  936.     {

  937.         TestContext test_ctx = { 0 };

  938.         const char *options[] = {

  939.             "",

  940.             ":",

  941.             "=",

  942.             "foo=:",

  943.             ":=foo",

  944.             "=foo",

  945.             "foo=",

  946.             "foo",

  947.             "foo=val",

  948.             "foo==val",

  949.             "toggle=:",

  950.             "string=:",

  951.             "toggle=1 : foo",

  952.             "toggle=100",

  953.             "toggle==1",

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

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

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

  957.             "rational=-1/0",

  958.             "size=1024x768",

  959.             "size=pal",

  960.             "size=bogus",

  961.             "pix_fmt=yuv420p",

  962.             "pix_fmt=2",

  963.             "pix_fmt=bogus",

  964.         };

  965. 

  966.         test_ctx.class = &test_class;

  967.         av_opt_set_defaults(&test_ctx);

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

  969. 

  970.         av_log_set_level(AV_LOG_DEBUG);

  971. 

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

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

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

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

  976.             printf("\n");

  977.         }

  978.         av_freep(&test_ctx.string);

  979.     }

  980. 

  981.     return 0;

  982. }

  983. 

  984. #endif