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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. #include "samplefmt.h"

  39. 

  40. #include <float.h>

  41. 

  42. #if FF_API_FIND_OPT

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

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

  45. {

  46.     const AVOption *o = NULL;

  47. 

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

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

  50.             return o;

  51.     }

  52.     return NULL;

  53. }

  54. #endif

  55. 

  56. #if FF_API_OLD_AVOPTIONS

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

  58. {

  59.     return av_opt_next(obj, last);

  60. }

  61. #endif

  62. 

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

  64. {

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

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

  67.         return class->option;

  68.     if (last && last[1].name)

  69.         return ++last;

  70.     return NULL;

  71. }

  72. 

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

  74. {

  75.     switch (o->type) {

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

  77.     case AV_OPT_TYPE_PIXEL_FMT:

  78.     case AV_OPT_TYPE_SAMPLE_FMT:

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

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

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

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

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

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

  85.                                                         return 0;

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

  87.     }

  88.     return AVERROR(EINVAL);

  89. }

  90. 

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

  92. {

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

  94.         av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range [%g - %g]\n",

  95.                num*intnum/den, o->name, o->min, o->max);

  96.         return AVERROR(ERANGE);

  97.     }

  98. 

  99.     switch (o->type) {

  100.     case AV_OPT_TYPE_FLAGS:

  101.     case AV_OPT_TYPE_PIXEL_FMT:

  102.     case AV_OPT_TYPE_SAMPLE_FMT:

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

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

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

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

  107.     case AV_OPT_TYPE_RATIONAL:

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

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

  110.         break;

  111.     default:

  112.         return AVERROR(EINVAL);

  113.     }

  114.     return 0;

  115. }

  116. 

  117. static const double const_values[] = {

  118.     M_PI,

  119.     M_E,

  120.     FF_QP2LAMBDA,

  121.     0

  122. };

  123. 

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

  125.     "PI",

  126.     "E",

  127.     "QP2LAMBDA",

  128.     0

  129. };

  130. 

  131. static int hexchar2int(char c) {

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

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

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

  135.     return -1;

  136. }

  137. 

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

  139. {

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

  141.     uint8_t *bin, *ptr;

  142.     int len = strlen(val);

  143. 

  144.     av_freep(dst);

  145.     *lendst = 0;

  146. 

  147.     if (len & 1)

  148.         return AVERROR(EINVAL);

  149.     len /= 2;

  150. 

  151.     ptr = bin = av_malloc(len);

  152.     while (*val) {

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

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

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

  156.             av_free(bin);

  157.             return AVERROR(EINVAL);

  158.         }

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

  160.     }

  161.     *dst = bin;

  162.     *lendst = len;

  163. 

  164.     return 0;

  165. }

  166. 

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

  168. {

  169.     av_freep(dst);

  170.     *dst = av_strdup(val);

  171.     return 0;

  172. }

  173. 

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

  175.                               opt->type == AV_OPT_TYPE_CONST || \

  176.                               opt->type == AV_OPT_TYPE_FLAGS || \

  177.                               opt->type == AV_OPT_TYPE_INT) ? \

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

  179. 

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

  181. {

  182.     int ret = 0, notfirst = 0;

  183.     for (;;) {

  184.         int i, den = 1;

  185.         char buf[256];

  186.         int cmd = 0;

  187.         double d, num = 1;

  188.         int64_t intnum = 1;

  189. 

  190.         i = 0;

  191.         if (*val == '+' || *val == '-') {

  192.             if (o->type == AV_OPT_TYPE_FLAGS)

  193.                 cmd = *(val++);

  194.             else if (!notfirst)

  195.                 buf[i++] = *val;

  196.         }

  197. 

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

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

  200.         buf[i] = 0;

  201. 

  202.         {

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

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

  205.                 d = DEFAULT_NUMVAL(o_named);

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

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

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

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

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

  211.             else {

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

  213.                 if (res < 0) {

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

  215.                     return res;

  216.                 }

  217.             }

  218.         }

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

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

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

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

  223.         } else {

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

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

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

  227.         }

  228. 

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

  230.             return ret;

  231.         val += i;

  232.         if (!*val)

  233.             return 0;

  234.         notfirst = 1;

  235.     }

  236. 

  237.     return 0;

  238. }

  239. 

  240. #if FF_API_OLD_AVOPTIONS

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

  242. {

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

  244.     if (o_out)

  245.         *o_out = o;

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

  247. }

  248. #endif

  249. 

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

  251. {

  252.     int ret;

  253.     void *dst, *target_obj;

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

  255.     if (!o || !target_obj)

  256.         return AVERROR_OPTION_NOT_FOUND;

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

  258.                  o->type != AV_OPT_TYPE_PIXEL_FMT && o->type != AV_OPT_TYPE_SAMPLE_FMT &&

  259.                  o->type != AV_OPT_TYPE_IMAGE_SIZE && o->type != AV_OPT_TYPE_VIDEO_RATE))

  260.         return AVERROR(EINVAL);

  261. 

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

  263.     switch (o->type) {

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

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

  266.     case AV_OPT_TYPE_FLAGS:

  267.     case AV_OPT_TYPE_INT:

  268.     case AV_OPT_TYPE_INT64:

  269.     case AV_OPT_TYPE_FLOAT:

  270.     case AV_OPT_TYPE_DOUBLE:

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

  272.     case AV_OPT_TYPE_IMAGE_SIZE:

  273.         if (!val || !strcmp(val, "none")) {

  274.             *(int *)dst = *((int *)dst + 1) = 0;

  275.             return 0;

  276.         }

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

  278.         if (ret < 0)

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

  280.         return ret;

  281.     case AV_OPT_TYPE_VIDEO_RATE:

  282.         if (!val) {

  283.             ret = AVERROR(EINVAL);

  284.         } else {

  285.             ret = av_parse_video_rate(dst, val);

  286.         }

  287.         if (ret < 0)

  288.             av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as video rate\n", val);

  289.         return ret;

  290.     case AV_OPT_TYPE_PIXEL_FMT:

  291.         if (!val || !strcmp(val, "none")) {

  292.             ret = AV_PIX_FMT_NONE;

  293.         } else {

  294.             ret = av_get_pix_fmt(val);

  295.             if (ret == AV_PIX_FMT_NONE) {

  296.                 char *tail;

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

  298.                 if (*tail || (unsigned)ret >= AV_PIX_FMT_NB) {

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

  300.                     return AVERROR(EINVAL);

  301.                 }

  302.             }

  303.         }

  304.         *(enum AVPixelFormat *)dst = ret;

  305.         return 0;

  306.     case AV_OPT_TYPE_SAMPLE_FMT:

  307.         if (!val || !strcmp(val, "none")) {

  308.             ret = AV_SAMPLE_FMT_NONE;

  309.         } else {

  310.             ret = av_get_sample_fmt(val);

  311.             if (ret == AV_SAMPLE_FMT_NONE) {

  312.                 char *tail;

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

  314.                 if (*tail || (unsigned)ret >= AV_SAMPLE_FMT_NB) {

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

  316.                     return AVERROR(EINVAL);

  317.                 }

  318.             }

  319.         }

  320.         *(enum AVSampleFormat *)dst = ret;

  321.         return 0;

  322.     }

  323. 

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

  325.     return AVERROR(EINVAL);

  326. }

  327. 

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

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

  330.     {\

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

  332.             return AVERROR(EINVAL);\

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

  334.     }

  335. 

  336. OPT_EVAL_NUMBER(flags,  AV_OPT_TYPE_FLAGS,    int)

  337. OPT_EVAL_NUMBER(int,    AV_OPT_TYPE_INT,      int)

  338. OPT_EVAL_NUMBER(int64,  AV_OPT_TYPE_INT64,    int64_t)

  339. OPT_EVAL_NUMBER(float,  AV_OPT_TYPE_FLOAT,    float)

  340. OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE,   double)

  341. OPT_EVAL_NUMBER(q,      AV_OPT_TYPE_RATIONAL, AVRational)

  342. 

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

  344.                                   int search_flags)

  345. {

  346.     void *dst, *target_obj;

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

  348. 

  349.     if (!o || !target_obj)

  350.         return AVERROR_OPTION_NOT_FOUND;

  351. 

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

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

  354. }

  355. 

  356. #if FF_API_OLD_AVOPTIONS

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

  358. {

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

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

  361.         return NULL;

  362.     return o;

  363. }

  364. 

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

  366. {

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

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

  369.         return NULL;

  370.     return o;

  371. }

  372. 

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

  374. {

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

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

  377.         return NULL;

  378.     return o;

  379. }

  380. #endif

  381. 

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

  383. {

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

  385. }

  386. 

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

  388. {

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

  390. }

  391. 

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

  393. {

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

  395. }

  396. 

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

  398. {

  399.     void *target_obj;

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

  401.     uint8_t *ptr;

  402.     uint8_t **dst;

  403.     int *lendst;

  404. 

  405.     if (!o || !target_obj)

  406.         return AVERROR_OPTION_NOT_FOUND;

  407. 

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

  409.         return AVERROR(EINVAL);

  410. 

  411.     ptr = av_malloc(len);

  412.     if (!ptr)

  413.         return AVERROR(ENOMEM);

  414. 

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

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

  417. 

  418.     av_free(*dst);

  419.     *dst = ptr;

  420.     *lendst = len;

  421.     memcpy(ptr, val, len);

  422. 

  423.     return 0;

  424. }

  425. 

  426. int av_opt_set_image_size(void *obj, const char *name, int w, int h, int search_flags)

  427. {

  428.     void *target_obj;

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

  430. 

  431.     if (!o || !target_obj)

  432.         return AVERROR_OPTION_NOT_FOUND;

  433.     if (o->type != AV_OPT_TYPE_IMAGE_SIZE) {

  434.         av_log(obj, AV_LOG_ERROR,

  435.                "The value set by option '%s' is not an image size.\n", o->name);

  436.         return AVERROR(EINVAL);

  437.     }

  438.     if (w<0 || h<0) {

  439.         av_log(obj, AV_LOG_ERROR,

  440.                "Invalid negative size value %dx%d for size '%s'\n", w, h, o->name);

  441.         return AVERROR(EINVAL);

  442.     }

  443.     *(int *)(((uint8_t *)target_obj)             + o->offset) = w;

  444.     *(int *)(((uint8_t *)target_obj+sizeof(int)) + o->offset) = h;

  445.     return 0;

  446. }

  447. 

  448. int av_opt_set_video_rate(void *obj, const char *name, AVRational val, int search_flags)

  449. {

  450.     void *target_obj;

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

  452. 

  453.     if (!o || !target_obj)

  454.         return AVERROR_OPTION_NOT_FOUND;

  455.     if (o->type != AV_OPT_TYPE_VIDEO_RATE) {

  456.         av_log(obj, AV_LOG_ERROR,

  457.                "The value set by option '%s' is not a video rate.\n", o->name);

  458.         return AVERROR(EINVAL);

  459.     }

  460.     if (val.num <= 0 || val.den <= 0)

  461.         return AVERROR(EINVAL);

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

  463. }

  464. 

  465. static int set_format(void *obj, const char *name, int fmt, int search_flags,

  466.                       enum AVOptionType type, const char *desc, int nb_fmts)

  467. {

  468.     void *target_obj;

  469.     const AVOption *o = av_opt_find2(obj, name, NULL, 0,

  470.                                      search_flags, &target_obj);

  471.     int min, max;

  472.     const AVClass *class = *(AVClass **)obj;

  473. 

  474.     if (!o || !target_obj)

  475.         return AVERROR_OPTION_NOT_FOUND;

  476.     if (o->type != type) {

  477.         av_log(obj, AV_LOG_ERROR,

  478.                "The value set by option '%s' is not a %s format", name, desc);

  479.         return AVERROR(EINVAL);

  480.     }

  481. 

  482. #if LIBAVUTIL_VERSION_MAJOR < 53

  483.     if (class->version && class->version < AV_VERSION_INT(52, 11, 100)) {

  484.         min = -1;

  485.         max = nb_fmts-1;

  486.     } else

  487. #endif

  488.     {

  489.         min = FFMIN(o->min, -1);

  490.         max = FFMAX(o->max, nb_fmts-1);

  491.     }

  492.     if (fmt < min || fmt > max) {

  493.         av_log(obj, AV_LOG_ERROR,

  494.                "Value %d for parameter '%s' out of %s format range [%d - %d]\n",

  495.                fmt, name, desc, min, max);

  496.         return AVERROR(ERANGE);

  497.     }

  498.     *(int *)(((uint8_t *)target_obj) + o->offset) = fmt;

  499.     return 0;

  500. }

  501. 

  502. int av_opt_set_pixel_fmt(void *obj, const char *name, enum AVPixelFormat fmt, int search_flags)

  503. {

  504.     return set_format(obj, name, fmt, search_flags, AV_OPT_TYPE_PIXEL_FMT, "pixel", AV_PIX_FMT_NB);

  505. }

  506. 

  507. int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags)

  508. {

  509.     return set_format(obj, name, fmt, search_flags, AV_OPT_TYPE_SAMPLE_FMT, "sample", AV_SAMPLE_FMT_NB);

  510. }

  511. 

  512. #if FF_API_OLD_AVOPTIONS

  513. /**

  514.  *

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

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

  517.  */

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

  519. {

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

  521.     void *dst;

  522.     uint8_t *bin;

  523.     int len, i;

  524.     if (!o)

  525.         return NULL;

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

  527.         return NULL;

  528. 

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

  530.     if (o_out) *o_out= o;

  531. 

  532.     switch (o->type) {

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

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

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

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

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

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

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

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

  541.     case AV_OPT_TYPE_BINARY:

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

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

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

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

  546.         break;

  547.     default: return NULL;

  548.     }

  549.     return buf;

  550. }

  551. #endif

  552. 

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

  554. {

  555.     void *dst, *target_obj;

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

  557.     uint8_t *bin, buf[128];

  558.     int len, i, ret;

  559. 

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

  561.         return AVERROR_OPTION_NOT_FOUND;

  562. 

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

  564. 

  565.     buf[0] = 0;

  566.     switch (o->type) {

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

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

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

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

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

  572.     case AV_OPT_TYPE_VIDEO_RATE:

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

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

  575.     case AV_OPT_TYPE_STRING:

  576.         if (*(uint8_t**)dst)

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

  578.         else

  579.             *out_val = av_strdup("");

  580.         return 0;

  581.     case AV_OPT_TYPE_BINARY:

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

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

  584.             return AVERROR(EINVAL);

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

  586.             return AVERROR(ENOMEM);

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

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

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

  590.         return 0;

  591.     case AV_OPT_TYPE_IMAGE_SIZE:

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

  593.         break;

  594.     case AV_OPT_TYPE_PIXEL_FMT:

  595.         ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_pix_fmt_name(*(enum AVPixelFormat *)dst), "none"));

  596.         break;

  597.     case AV_OPT_TYPE_SAMPLE_FMT:

  598.         ret = snprintf(buf, sizeof(buf), "%s", (char *)av_x_if_null(av_get_sample_fmt_name(*(enum AVSampleFormat *)dst), "none"));

  599.         break;

  600.     default:

  601.         return AVERROR(EINVAL);

  602.     }

  603. 

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

  605.         return AVERROR(EINVAL);

  606.     *out_val = av_strdup(buf);

  607.     return 0;

  608. }

  609. 

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

  611.                       int search_flags)

  612. {

  613.     void *dst, *target_obj;

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

  615.     if (!o || !target_obj)

  616.         goto error;

  617. 

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

  619. 

  620.     if (o_out) *o_out= o;

  621. 

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

  623. 

  624. error:

  625.     *den=*intnum=0;

  626.     return -1;

  627. }

  628. 

  629. #if FF_API_OLD_AVOPTIONS

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

  631. {

  632.     int64_t intnum=1;

  633.     double num=1;

  634.     int den=1;

  635. 

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

  637.         return NAN;

  638.     return num*intnum/den;

  639. }

  640. 

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

  642. {

  643.     int64_t intnum=1;

  644.     double num=1;

  645.     int den=1;

  646. 

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

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

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

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

  651.     else

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

  653. }

  654. 

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

  656. {

  657.     int64_t intnum=1;

  658.     double num=1;

  659.     int den=1;

  660. 

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

  662.         return -1;

  663.     return num*intnum/den;

  664. }

  665. #endif

  666. 

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

  668. {

  669.     int64_t intnum = 1;

  670.     double     num = 1;

  671.     int   ret, den = 1;

  672. 

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

  674.         return ret;

  675.     *out_val = num*intnum/den;

  676.     return 0;

  677. }

  678. 

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

  680. {

  681.     int64_t intnum = 1;

  682.     double     num = 1;

  683.     int   ret, den = 1;

  684. 

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

  686.         return ret;

  687.     *out_val = num*intnum/den;

  688.     return 0;

  689. }

  690. 

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

  692. {

  693.     int64_t intnum = 1;

  694.     double     num = 1;

  695.     int   ret, den = 1;

  696. 

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

  698.         return ret;

  699. 

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

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

  702.     else

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

  704.     return 0;

  705. }

  706. 

  707. int av_opt_get_image_size(void *obj, const char *name, int search_flags, int *w_out, int *h_out)

  708. {

  709.     void *dst, *target_obj;

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

  711.     if (!o || !target_obj)

  712.         return AVERROR_OPTION_NOT_FOUND;

  713.     if (o->type != AV_OPT_TYPE_IMAGE_SIZE) {

  714.         av_log(obj, AV_LOG_ERROR,

  715.                "The value for option '%s' is not an image size.\n", name);

  716.         return AVERROR(EINVAL);

  717.     }

  718. 

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

  720.     if (w_out) *w_out = *(int *)dst;

  721.     if (h_out) *h_out = *((int *)dst+1);

  722.     return 0;

  723. }

  724. 

  725. int av_opt_get_video_rate(void *obj, const char *name, int search_flags, AVRational *out_val)

  726. {

  727.     int64_t intnum = 1;

  728.     double     num = 1;

  729.     int   ret, den = 1;

  730. 

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

  732.         return ret;

  733. 

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

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

  736.     else

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

  738.     return 0;

  739. }

  740. 

  741. static int get_format(void *obj, const char *name, int search_flags, int *out_fmt,

  742.                       enum AVOptionType type, const char *desc)

  743. {

  744.     void *dst, *target_obj;

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

  746.     if (!o || !target_obj)

  747.         return AVERROR_OPTION_NOT_FOUND;

  748.     if (o->type != type) {

  749.         av_log(obj, AV_LOG_ERROR,

  750.                "The value for option '%s' is not a %s format.\n", desc, name);

  751.         return AVERROR(EINVAL);

  752.     }

  753. 

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

  755.     *out_fmt = *(int *)dst;

  756.     return 0;

  757. }

  758. 

  759. int av_opt_get_pixel_fmt(void *obj, const char *name, int search_flags, enum AVPixelFormat *out_fmt)

  760. {

  761.     return get_format(obj, name, search_flags, out_fmt, AV_OPT_TYPE_PIXEL_FMT, "pixel");

  762. }

  763. 

  764. int av_opt_get_sample_fmt(void *obj, const char *name, int search_flags, enum AVSampleFormat *out_fmt)

  765. {

  766.     return get_format(obj, name, search_flags, out_fmt, AV_OPT_TYPE_SAMPLE_FMT, "sample");

  767. }

  768. 

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

  770. {

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

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

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

  774.     int64_t res;

  775. 

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

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

  778.         return 0;

  779.     return res & flag->default_val.i64;

  780. }

  781. 

  782. static void log_value(void *av_log_obj, int level, double d)

  783. {

  784.     if      (d == INT_MAX) {

  785.         av_log(av_log_obj, level, "INT_MAX");

  786.     } else if (d == INT_MIN) {

  787.         av_log(av_log_obj, level, "INT_MIN");

  788.     } else if (d == (double)INT64_MAX) {

  789.         av_log(av_log_obj, level, "I64_MAX");

  790.     } else if (d == INT64_MIN) {

  791.         av_log(av_log_obj, level, "I64_MIN");

  792.     } else if (d == FLT_MAX) {

  793.         av_log(av_log_obj, level, "FLT_MAX");

  794.     } else if (d == FLT_MIN) {

  795.         av_log(av_log_obj, level, "FLT_MIN");

  796.     } else {

  797.         av_log(av_log_obj, level, "%g", d);

  798.     }

  799. }

  800. 

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

  802.                      int req_flags, int rej_flags)

  803. {

  804.     const AVOption *opt=NULL;

  805.     AVOptionRanges *r;

  806.     int i;

  807. 

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

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

  810.             continue;

  811. 

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

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

  814.          * Only print items from the requested unit.

  815.          */

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

  817.             continue;

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

  819.             continue;

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

  821.             continue;

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

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

  824.         else

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

  826. 

  827.         switch (opt->type) {

  828.             case AV_OPT_TYPE_FLAGS:

  829.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<flags>");

  830.                 break;

  831.             case AV_OPT_TYPE_INT:

  832.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<int>");

  833.                 break;

  834.             case AV_OPT_TYPE_INT64:

  835.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<int64>");

  836.                 break;

  837.             case AV_OPT_TYPE_DOUBLE:

  838.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<double>");

  839.                 break;

  840.             case AV_OPT_TYPE_FLOAT:

  841.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<float>");

  842.                 break;

  843.             case AV_OPT_TYPE_STRING:

  844.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<string>");

  845.                 break;

  846.             case AV_OPT_TYPE_RATIONAL:

  847.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<rational>");

  848.                 break;

  849.             case AV_OPT_TYPE_BINARY:

  850.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<binary>");

  851.                 break;

  852.             case AV_OPT_TYPE_IMAGE_SIZE:

  853.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<image_size>");

  854.                 break;

  855.             case AV_OPT_TYPE_VIDEO_RATE:

  856.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<video_rate>");

  857.                 break;

  858.             case AV_OPT_TYPE_PIXEL_FMT:

  859.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<pix_fmt>");

  860.                 break;

  861.             case AV_OPT_TYPE_SAMPLE_FMT:

  862.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "<sample_fmt>");

  863.                 break;

  864.             case AV_OPT_TYPE_CONST:

  865.             default:

  866.                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "");

  867.                 break;

  868.         }

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

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

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

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

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

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

  875. 

  876.         if (opt->help)

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

  878. 

  879.         if (av_opt_query_ranges(&r, obj, opt->name, AV_OPT_SEARCH_FAKE_OBJ) >= 0) {

  880.             switch (opt->type) {

  881.             case AV_OPT_TYPE_INT:

  882.             case AV_OPT_TYPE_INT64:

  883.             case AV_OPT_TYPE_DOUBLE:

  884.             case AV_OPT_TYPE_FLOAT:

  885.             case AV_OPT_TYPE_RATIONAL:

  886.                 for (i = 0; i < r->nb_ranges; i++) {

  887.                     av_log(av_log_obj, AV_LOG_INFO, " (from ");

  888.                     log_value(av_log_obj, AV_LOG_INFO, r->range[i]->value_min);

  889.                     av_log(av_log_obj, AV_LOG_INFO, " to ");

  890.                     log_value(av_log_obj, AV_LOG_INFO, r->range[i]->value_max);

  891.                     av_log(av_log_obj, AV_LOG_INFO, ")");

  892.                 }

  893.                 break;

  894.             }

  895.             av_opt_freep_ranges(&r);

  896.         }

  897. 

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

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

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

  901.         }

  902.     }

  903. }

  904. 

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

  906. {

  907.     if (!obj)

  908.         return -1;

  909. 

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

  911. 

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

  913. 

  914.     return 0;

  915. }

  916. 

  917. void av_opt_set_defaults(void *s)

  918. {

  919. #if FF_API_OLD_AVOPTIONS

  920.     av_opt_set_defaults2(s, 0, 0);

  921. }

  922. 

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

  924. {

  925. #endif

  926.     const AVClass *class = *(AVClass **)s;

  927.     const AVOption *opt = NULL;

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

  929. #if FF_API_OLD_AVOPTIONS

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

  931.             continue;

  932. #endif

  933.         switch (opt->type) {

  934.             case AV_OPT_TYPE_CONST:

  935.                 /* Nothing to be done here */

  936.             break;

  937.             case AV_OPT_TYPE_FLAGS:

  938.             case AV_OPT_TYPE_INT:

  939.             case AV_OPT_TYPE_INT64:

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

  941.             break;

  942.             case AV_OPT_TYPE_DOUBLE:

  943.             case AV_OPT_TYPE_FLOAT: {

  944.                 double val;

  945.                 val = opt->default_val.dbl;

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

  947.             }

  948.             break;

  949.             case AV_OPT_TYPE_RATIONAL: {

  950.                 AVRational val;

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

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

  953.             }

  954.             break;

  955.             case AV_OPT_TYPE_STRING:

  956.             case AV_OPT_TYPE_IMAGE_SIZE:

  957.             case AV_OPT_TYPE_VIDEO_RATE:

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

  959.                 break;

  960.             case AV_OPT_TYPE_PIXEL_FMT:

  961. #if LIBAVUTIL_VERSION_MAJOR < 53

  962.                 if (class->version && class->version < AV_VERSION_INT(52, 10, 100))

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

  964.                 else

  965. #endif

  966.                     av_opt_set_pixel_fmt(s, opt->name, opt->default_val.i64, 0);

  967.                 break;

  968.             case AV_OPT_TYPE_SAMPLE_FMT:

  969. #if LIBAVUTIL_VERSION_MAJOR < 53

  970.                 if (class->version && class->version < AV_VERSION_INT(52, 10, 100))

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

  972.                 else

  973. #endif

  974.                     av_opt_set_sample_fmt(s, opt->name, opt->default_val.i64, 0);

  975.                 break;

  976.             case AV_OPT_TYPE_BINARY:

  977.                 /* Cannot set default for binary */

  978.             break;

  979.             default:

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

  981.         }

  982.     }

  983. }

  984. 

  985. /**

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

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

  988.  *

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

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

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

  992.  * separate key from value

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

  994.  * two pairs from each other

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

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

  997.  * of error:

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

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

  1000.  * cannot be set

  1001.  */

  1002. static int parse_key_value_pair(void *ctx, const char **buf,

  1003.                                 const char *key_val_sep, const char *pairs_sep)

  1004. {

  1005.     char *key = av_get_token(buf, key_val_sep);

  1006.     char *val;

  1007.     int ret;

  1008. 

  1009.     if (*key && strspn(*buf, key_val_sep)) {

  1010.         (*buf)++;

  1011.         val = av_get_token(buf, pairs_sep);

  1012.     } else {

  1013.         av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);

  1014.         av_free(key);

  1015.         return AVERROR(EINVAL);

  1016.     }

  1017. 

  1018.     av_log(ctx, AV_LOG_DEBUG, "Setting entry with key '%s' to value '%s'\n", key, val);

  1019. 

  1020.     ret = av_opt_set(ctx, key, val, 0);

  1021.     if (ret == AVERROR_OPTION_NOT_FOUND)

  1022.         av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);

  1023. 

  1024.     av_free(key);

  1025.     av_free(val);

  1026.     return ret;

  1027. }

  1028. 

  1029. int av_set_options_string(void *ctx, const char *opts,

  1030.                           const char *key_val_sep, const char *pairs_sep)

  1031. {

  1032.     int ret, count = 0;

  1033. 

  1034.     if (!opts)

  1035.         return 0;

  1036. 

  1037.     while (*opts) {

  1038.         if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)

  1039.             return ret;

  1040.         count++;

  1041. 

  1042.         if (*opts)

  1043.             opts++;

  1044.     }

  1045. 

  1046.     return count;

  1047. }

  1048. 

  1049. #define WHITESPACES " \n\t"

  1050. 

  1051. static int is_key_char(char c)

  1052. {

  1053.     return (unsigned)((c | 32) - 'a') < 26 ||

  1054.            (unsigned)(c - '0') < 10 ||

  1055.            c == '-' || c == '_' || c == '/' || c == '.';

  1056. }

  1057. 

  1058. /**

  1059.  * Read a key from a string.

  1060.  *

  1061.  * The key consists of is_key_char characters and must be terminated by a

  1062.  * character from the delim string; spaces are ignored.

  1063.  *

  1064.  * @return  0 for success (even with ellipsis), <0 for failure

  1065.  */

  1066. static int get_key(const char **ropts, const char *delim, char **rkey)

  1067. {

  1068.     const char *opts = *ropts;

  1069.     const char *key_start, *key_end;

  1070. 

  1071.     key_start = opts += strspn(opts, WHITESPACES);

  1072.     while (is_key_char(*opts))

  1073.         opts++;

  1074.     key_end = opts;

  1075.     opts += strspn(opts, WHITESPACES);

  1076.     if (!*opts || !strchr(delim, *opts))

  1077.         return AVERROR(EINVAL);

  1078.     opts++;

  1079.     if (!(*rkey = av_malloc(key_end - key_start + 1)))

  1080.         return AVERROR(ENOMEM);

  1081.     memcpy(*rkey, key_start, key_end - key_start);

  1082.     (*rkey)[key_end - key_start] = 0;

  1083.     *ropts = opts;

  1084.     return 0;

  1085. }

  1086. 

  1087. int av_opt_get_key_value(const char **ropts,

  1088.                          const char *key_val_sep, const char *pairs_sep,

  1089.                          unsigned flags,

  1090.                          char **rkey, char **rval)

  1091. {

  1092.     int ret;

  1093.     char *key = NULL, *val;

  1094.     const char *opts = *ropts;

  1095. 

  1096.     if ((ret = get_key(&opts, key_val_sep, &key)) < 0 &&

  1097.         !(flags & AV_OPT_FLAG_IMPLICIT_KEY))

  1098.         return AVERROR(EINVAL);

  1099.     if (!(val = av_get_token(&opts, pairs_sep))) {

  1100.         av_free(key);

  1101.         return AVERROR(ENOMEM);

  1102.     }

  1103.     *ropts = opts;

  1104.     *rkey  = key;

  1105.     *rval  = val;

  1106.     return 0;

  1107. }

  1108. 

  1109. int av_opt_set_from_string(void *ctx, const char *opts,

  1110.                            const char *const *shorthand,

  1111.                            const char *key_val_sep, const char *pairs_sep)

  1112. {

  1113.     int ret, count = 0;

  1114.     const char *dummy_shorthand = NULL;

  1115.     char *av_uninit(parsed_key), *av_uninit(value);

  1116.     const char *key;

  1117. 

  1118.     if (!opts)

  1119.         return 0;

  1120.     if (!shorthand)

  1121.         shorthand = &dummy_shorthand;

  1122. 

  1123.     while (*opts) {

  1124.         ret = av_opt_get_key_value(&opts, key_val_sep, pairs_sep,

  1125.                                    *shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,

  1126.                                    &parsed_key, &value);

  1127.         if (ret < 0) {

  1128.             if (ret == AVERROR(EINVAL))

  1129.                 av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", opts);

  1130.             else

  1131.                 av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", opts,

  1132.                        av_err2str(ret));

  1133.             return ret;

  1134.         }

  1135.         if (*opts)

  1136.             opts++;

  1137.         if (parsed_key) {

  1138.             key = parsed_key;

  1139.             while (*shorthand) /* discard all remaining shorthand */

  1140.                 shorthand++;

  1141.         } else {

  1142.             key = *(shorthand++);

  1143.         }

  1144. 

  1145.         av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);

  1146.         if ((ret = av_opt_set(ctx, key, value, 0)) < 0) {

  1147.             if (ret == AVERROR_OPTION_NOT_FOUND)

  1148.                 av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);

  1149.             av_free(value);

  1150.             av_free(parsed_key);

  1151.             return ret;

  1152.         }

  1153. 

  1154.         av_free(value);

  1155.         av_free(parsed_key);

  1156.         count++;

  1157.     }

  1158.     return count;

  1159. }

  1160. 

  1161. void av_opt_free(void *obj)

  1162. {

  1163.     const AVOption *o = NULL;

  1164.     while ((o = av_opt_next(obj, o)))

  1165.         if (o->type == AV_OPT_TYPE_STRING || o->type == AV_OPT_TYPE_BINARY)

  1166.             av_freep((uint8_t *)obj + o->offset);

  1167. }

  1168. 

  1169. int av_opt_set_dict(void *obj, AVDictionary **options)

  1170. {

  1171.     AVDictionaryEntry *t = NULL;

  1172.     AVDictionary    *tmp = NULL;

  1173.     int ret = 0;

  1174. 

  1175.     while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {

  1176.         ret = av_opt_set(obj, t->key, t->value, 0);

  1177.         if (ret == AVERROR_OPTION_NOT_FOUND)

  1178.             av_dict_set(&tmp, t->key, t->value, 0);

  1179.         else if (ret < 0) {

  1180.             av_log(obj, AV_LOG_ERROR, "Error setting option %s to value %s.\n", t->key, t->value);

  1181.             break;

  1182.         }

  1183.         ret = 0;

  1184.     }

  1185.     av_dict_free(options);

  1186.     *options = tmp;

  1187.     return ret;

  1188. }

  1189. 

  1190. const AVOption *av_opt_find(void *obj, const char *name, const char *unit,

  1191.                             int opt_flags, int search_flags)

  1192. {

  1193.     return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);

  1194. }

  1195. 

  1196. const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,

  1197.                              int opt_flags, int search_flags, void **target_obj)

  1198. {

  1199.     const AVClass  *c;

  1200.     const AVOption *o = NULL;

  1201. 

  1202.     if(!obj)

  1203.         return NULL;

  1204. 

  1205.     c= *(AVClass**)obj;

  1206. 

  1207.     if (search_flags & AV_OPT_SEARCH_CHILDREN) {

  1208.         if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {

  1209.             const AVClass *child = NULL;

  1210.             while (child = av_opt_child_class_next(c, child))

  1211.                 if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))

  1212.                     return o;

  1213.         } else {

  1214.             void *child = NULL;

  1215.             while (child = av_opt_child_next(obj, child))

  1216.                 if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))

  1217.                     return o;

  1218.         }

  1219.     }

  1220. 

  1221.     while (o = av_opt_next(obj, o)) {

  1222.         if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&

  1223.             ((!unit && o->type != AV_OPT_TYPE_CONST) ||

  1224.              (unit  && o->type == AV_OPT_TYPE_CONST && o->unit && !strcmp(o->unit, unit)))) {

  1225.             if (target_obj) {

  1226.                 if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))

  1227.                     *target_obj = obj;

  1228.                 else

  1229.                     *target_obj = NULL;

  1230.             }

  1231.             return o;

  1232.         }

  1233.     }

  1234.     return NULL;

  1235. }

  1236. 

  1237. void *av_opt_child_next(void *obj, void *prev)

  1238. {

  1239.     const AVClass *c = *(AVClass**)obj;

  1240.     if (c->child_next)

  1241.         return c->child_next(obj, prev);

  1242.     return NULL;

  1243. }

  1244. 

  1245. const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)

  1246. {

  1247.     if (parent->child_class_next)

  1248.         return parent->child_class_next(prev);

  1249.     return NULL;

  1250. }

  1251. 

  1252. void *av_opt_ptr(const AVClass *class, void *obj, const char *name)

  1253. {

  1254.     const AVOption *opt= av_opt_find2(&class, name, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ, NULL);

  1255.     if(!opt)

  1256.         return NULL;

  1257.     return (uint8_t*)obj + opt->offset;

  1258. }

  1259. 

  1260. int av_opt_query_ranges(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)

  1261. {

  1262.     const AVClass *c = *(AVClass**)obj;

  1263.     int (*callback)(AVOptionRanges **, void *obj, const char *key, int flags) = NULL;

  1264. 

  1265.     if (c->version > (52 << 16 | 11 << 8))

  1266.         callback = c->query_ranges;

  1267. 

  1268.     if (!callback)

  1269.         callback = av_opt_query_ranges_default;

  1270. 

  1271.     return callback(ranges_arg, obj, key, flags);

  1272. }

  1273. 

  1274. int av_opt_query_ranges_default(AVOptionRanges **ranges_arg, void *obj, const char *key, int flags)

  1275. {

  1276.     AVOptionRanges *ranges = av_mallocz(sizeof(*ranges));

  1277.     AVOptionRange **range_array = av_mallocz(sizeof(void*));

  1278.     AVOptionRange *range = av_mallocz(sizeof(*range));

  1279.     const AVOption *field = av_opt_find(obj, key, NULL, 0, flags);

  1280.     int ret;

  1281. 

  1282.     *ranges_arg = NULL;

  1283. 

  1284.     if (!ranges || !range || !range_array || !field) {

  1285.         ret = AVERROR(ENOMEM);

  1286.         goto fail;

  1287.     }

  1288. 

  1289.     ranges->range = range_array;

  1290.     ranges->range[0] = range;

  1291.     ranges->nb_ranges = 1;

  1292.     range->is_range = 1;

  1293.     range->value_min = field->min;

  1294.     range->value_max = field->max;

  1295. 

  1296.     switch (field->type) {

  1297.     case AV_OPT_TYPE_INT:

  1298.     case AV_OPT_TYPE_INT64:

  1299.     case AV_OPT_TYPE_PIXEL_FMT:

  1300.     case AV_OPT_TYPE_SAMPLE_FMT:

  1301.     case AV_OPT_TYPE_FLOAT:

  1302.     case AV_OPT_TYPE_DOUBLE:

  1303.         break;

  1304.     case AV_OPT_TYPE_STRING:

  1305.         range->component_min = 0;

  1306.         range->component_max = 0x10FFFF; // max unicode value

  1307.         range->value_min = -1;

  1308.         range->value_max = INT_MAX;

  1309.         break;

  1310.     case AV_OPT_TYPE_RATIONAL:

  1311.         range->component_min = INT_MIN;

  1312.         range->component_max = INT_MAX;

  1313.         break;

  1314.     case AV_OPT_TYPE_IMAGE_SIZE:

  1315.         range->component_min = 0;

  1316.         range->component_max = INT_MAX/128/8;

  1317.         range->value_min = 0;

  1318.         range->value_max = INT_MAX/8;

  1319.         break;

  1320.     case AV_OPT_TYPE_VIDEO_RATE:

  1321.         range->component_min = 1;

  1322.         range->component_max = INT_MAX;

  1323.         range->value_min = 1;

  1324.         range->value_max = INT_MAX;

  1325.         break;

  1326.     default:

  1327.         ret = AVERROR(ENOSYS);

  1328.         goto fail;

  1329.     }

  1330. 

  1331.     *ranges_arg = ranges;

  1332.     return 0;

  1333. fail:

  1334.     av_free(ranges);

  1335.     av_free(range);

  1336.     av_free(range_array);

  1337.     return ret;

  1338. }

  1339. 

  1340. void av_opt_freep_ranges(AVOptionRanges **rangesp)

  1341. {

  1342.     int i;

  1343.     AVOptionRanges *ranges = *rangesp;

  1344. 

  1345.     for (i = 0; i < ranges->nb_ranges; i++) {

  1346.         AVOptionRange *range = ranges->range[i];

  1347.         av_freep(&range->str);

  1348.         av_freep(&ranges->range[i]);

  1349.     }

  1350.     av_freep(&ranges->range);

  1351.     av_freep(rangesp);

  1352. }

  1353. 

  1354. #ifdef TEST

  1355. 

  1356. typedef struct TestContext

  1357. {

  1358.     const AVClass *class;

  1359.     int num;

  1360.     int toggle;

  1361.     char *string;

  1362.     int flags;

  1363.     AVRational rational;

  1364.     AVRational video_rate;

  1365.     int w, h;

  1366.     enum AVPixelFormat pix_fmt;

  1367.     enum AVSampleFormat sample_fmt;

  1368. } TestContext;

  1369. 

  1370. #define OFFSET(x) offsetof(TestContext, x)

  1371. 

  1372. #define TEST_FLAG_COOL 01

  1373. #define TEST_FLAG_LAME 02

  1374. #define TEST_FLAG_MU   04

  1375. 

  1376. static const AVOption test_options[]= {

  1377. {"num",      "set num",        OFFSET(num),      AV_OPT_TYPE_INT,      {.i64 = 0},       0,        100                 },

  1378. {"toggle",   "set toggle",     OFFSET(toggle),   AV_OPT_TYPE_INT,      {.i64 = 0},       0,        1                   },

  1379. {"rational", "set rational",   OFFSET(rational), AV_OPT_TYPE_RATIONAL, {.dbl = 0},       0,        10                  },

  1380. {"string",   "set string",     OFFSET(string),   AV_OPT_TYPE_STRING,   {.str = "default"}, CHAR_MIN, CHAR_MAX          },

  1381. {"flags",    "set flags",      OFFSET(flags),    AV_OPT_TYPE_FLAGS,    {.i64 = 0},       0,        INT_MAX, 0, "flags" },

  1382. {"cool",     "set cool flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_COOL}, INT_MIN,  INT_MAX, 0, "flags" },

  1383. {"lame",     "set lame flag ", 0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_LAME}, INT_MIN,  INT_MAX, 0, "flags" },

  1384. {"mu",       "set mu flag ",   0,                AV_OPT_TYPE_CONST,    {.i64 = TEST_FLAG_MU},   INT_MIN,  INT_MAX, 0, "flags" },

  1385. {"size",     "set size",       OFFSET(w),        AV_OPT_TYPE_IMAGE_SIZE,{0},             0,        0                   },

  1386. {"pix_fmt",  "set pixfmt",     OFFSET(pix_fmt),  AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, -1, AV_PIX_FMT_NB-1},

  1387. {"sample_fmt", "set samplefmt", OFFSET(sample_fmt), AV_OPT_TYPE_SAMPLE_FMT, {.i64 = AV_SAMPLE_FMT_NONE}, -1, AV_SAMPLE_FMT_NB-1},

  1388. {"video_rate", "set videorate", OFFSET(video_rate), AV_OPT_TYPE_VIDEO_RATE,  {.str = "25"}, 0,     0                   },

  1389. {NULL},

  1390. };

  1391. 

  1392. static const char *test_get_name(void *ctx)

  1393. {

  1394.     return "test";

  1395. }

  1396. 

  1397. static const AVClass test_class = {

  1398.     "TestContext",

  1399.     test_get_name,

  1400.     test_options

  1401. };

  1402. 

  1403. int main(void)

  1404. {

  1405.     int i;

  1406. 

  1407.     printf("\nTesting av_set_options_string()\n");

  1408.     {

  1409.         TestContext test_ctx = { 0 };

  1410.         const char *options[] = {

  1411.             "",

  1412.             ":",

  1413.             "=",

  1414.             "foo=:",

  1415.             ":=foo",

  1416.             "=foo",

  1417.             "foo=",

  1418.             "foo",

  1419.             "foo=val",

  1420.             "foo==val",

  1421.             "toggle=:",

  1422.             "string=:",

  1423.             "toggle=1 : foo",

  1424.             "toggle=100",

  1425.             "toggle==1",

  1426.             "flags=+mu-lame : num=42: toggle=0",

  1427.             "num=42 : string=blahblah",

  1428.             "rational=0 : rational=1/2 : rational=1/-1",

  1429.             "rational=-1/0",

  1430.             "size=1024x768",

  1431.             "size=pal",

  1432.             "size=bogus",

  1433.             "pix_fmt=yuv420p",

  1434.             "pix_fmt=2",

  1435.             "pix_fmt=bogus",

  1436.             "sample_fmt=s16",

  1437.             "sample_fmt=2",

  1438.             "sample_fmt=bogus",

  1439.             "video_rate=pal",

  1440.             "video_rate=25",

  1441.             "video_rate=30000/1001",

  1442.             "video_rate=30/1.001",

  1443.             "video_rate=bogus",

  1444.         };

  1445. 

  1446.         test_ctx.class = &test_class;

  1447.         av_opt_set_defaults(&test_ctx);

  1448. 

  1449.         av_log_set_level(AV_LOG_DEBUG);

  1450. 

  1451.         for (i=0; i < FF_ARRAY_ELEMS(options); i++) {

  1452.             av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);

  1453.             if (av_set_options_string(&test_ctx, options[i], "=", ":") < 0)

  1454.                 av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);

  1455.             printf("\n");

  1456.         }

  1457.         av_freep(&test_ctx.string);

  1458.     }

  1459. 

  1460.     printf("\nTesting av_opt_set_from_string()\n");

  1461.     {

  1462.         TestContext test_ctx = { 0 };

  1463.         const char *options[] = {

  1464.             "",

  1465.             "5",

  1466.             "5:hello",

  1467.             "5:hello:size=pal",

  1468.             "5:size=pal:hello",

  1469.             ":",

  1470.             "=",

  1471.             " 5 : hello : size = pal ",

  1472.             "a_very_long_option_name_that_will_need_to_be_ellipsized_around_here=42"

  1473.         };

  1474.         const char *shorthand[] = { "num", "string", NULL };

  1475. 

  1476.         test_ctx.class = &test_class;

  1477.         av_opt_set_defaults(&test_ctx);

  1478.         test_ctx.string = av_strdup("default");

  1479. 

  1480.         av_log_set_level(AV_LOG_DEBUG);

  1481. 

  1482.         for (i=0; i < FF_ARRAY_ELEMS(options); i++) {

  1483.             av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);

  1484.             if (av_opt_set_from_string(&test_ctx, options[i], shorthand, "=", ":") < 0)

  1485.                 av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);

  1486.             printf("\n");

  1487.         }

  1488.         av_freep(&test_ctx.string);

  1489.     }

  1490. 

  1491.     return 0;

  1492. }

  1493. 

  1494. #endif