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FFmpeg/libavutil/opt.c

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/*
* AVOptions
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* AVOptions
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "avstring.h"
#include "avutil.h"
#include "common.h"
#include "dict.h"
#include "eval.h"
#include "log.h"
#include "mathematics.h"
#include "opt.h"
const AVOption *av_opt_next(const void *obj, const AVOption *last)
{
AVClass *class = *(AVClass **)obj;
if (!last && class->option && class->option[0].name)
return class->option;
if (last && last[1].name)
return ++last;
return NULL;
}
static int read_number(const AVOption *o, const void *dst, double *num, int *den, int64_t *intnum)
{
switch (o->type) {
case AV_OPT_TYPE_FLAGS:
*intnum = *(unsigned int *)dst;
return 0;
case AV_OPT_TYPE_INT:
*intnum = *(int *)dst;
return 0;
case AV_OPT_TYPE_INT64:
*intnum = *(int64_t *)dst;
return 0;
case AV_OPT_TYPE_FLOAT:
*num = *(float *)dst;
return 0;
case AV_OPT_TYPE_DOUBLE:
*num = *(double *)dst;
return 0;
case AV_OPT_TYPE_RATIONAL:
*intnum = ((AVRational *)dst)->num;
*den = ((AVRational *)dst)->den;
return 0;
}
return AVERROR(EINVAL);
}
static int write_number(void *obj, const AVOption *o, void *dst, double num, int den, int64_t intnum)
{
if (o->type != AV_OPT_TYPE_FLAGS &&
(o->max * den < num * intnum || o->min * den > num * intnum)) {
av_log(obj, AV_LOG_ERROR, "Value %f for parameter '%s' out of range\n",
num * intnum / den, o->name);
return AVERROR(ERANGE);
}
switch (o->type) {
case AV_OPT_TYPE_FLAGS:
case AV_OPT_TYPE_INT:
*(int *)dst = llrint(num / den) * intnum;
break;
case AV_OPT_TYPE_INT64:
*(int64_t *)dst = llrint(num / den) * intnum;
break;
case AV_OPT_TYPE_FLOAT:
*(float *)dst = num * intnum / den;
break;
case AV_OPT_TYPE_DOUBLE:
*(double *)dst = num * intnum / den;
break;
case AV_OPT_TYPE_RATIONAL:
if ((int) num == num)
*(AVRational *)dst = (AVRational) { num *intnum, den };
else
*(AVRational *)dst = av_d2q(num * intnum / den, 1 << 24);
break;
default:
return AVERROR(EINVAL);
}
return 0;
}
static const double const_values[] = {
M_PI,
M_E,
FF_QP2LAMBDA,
0
};
static const char *const const_names[] = {
"PI",
"E",
"QP2LAMBDA",
0
};
static int hexchar2int(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
static int set_string_binary(void *obj, const AVOption *o, const char *val, uint8_t **dst)
{
int *lendst = (int *)(dst + 1);
uint8_t *bin, *ptr;
int len = strlen(val);
av_freep(dst);
*lendst = 0;
if (len & 1)
return AVERROR(EINVAL);
len /= 2;
ptr = bin = av_malloc(len);
if (!ptr)
return AVERROR(ENOMEM);
while (*val) {
int a = hexchar2int(*val++);
int b = hexchar2int(*val++);
if (a < 0 || b < 0) {
av_free(bin);
return AVERROR(EINVAL);
}
*ptr++ = (a << 4) | b;
}
*dst = bin;
*lendst = len;
return 0;
}
static int set_string(void *obj, const AVOption *o, const char *val, uint8_t **dst)
{
av_freep(dst);
*dst = av_strdup(val);
return *dst ? 0 : AVERROR(ENOMEM);
}
#define DEFAULT_NUMVAL(opt) ((opt->type == AV_OPT_TYPE_INT64 || \
opt->type == AV_OPT_TYPE_CONST || \
opt->type == AV_OPT_TYPE_FLAGS || \
opt->type == AV_OPT_TYPE_INT) \
? opt->default_val.i64 \
: opt->default_val.dbl)
static int set_string_number(void *obj, void *target_obj, const AVOption *o, const char *val, void *dst)
{
int ret = 0, notfirst = 0;
for (;;) {
int i, den = 1;
char buf[256];
int cmd = 0;
double d, num = 1;
int64_t intnum = 1;
i = 0;
if (*val == '+' || *val == '-') {
if (o->type == AV_OPT_TYPE_FLAGS)
cmd = *(val++);
else if (!notfirst)
buf[i++] = *val;
}
for (; i < sizeof(buf) - 1 && val[i] && val[i] != '+' && val[i] != '-'; i++)
buf[i] = val[i];
buf[i] = 0;
{
const AVOption *o_named = av_opt_find(target_obj, buf, o->unit, 0, 0);
if (o_named && o_named->type == AV_OPT_TYPE_CONST)
d = DEFAULT_NUMVAL(o_named);
else if (!strcmp(buf, "default"))
d = DEFAULT_NUMVAL(o);
else if (!strcmp(buf, "max"))
d = o->max;
else if (!strcmp(buf, "min"))
d = o->min;
else if (!strcmp(buf, "none"))
d = 0;
else if (!strcmp(buf, "all"))
d = ~0;
else {
int res = av_expr_parse_and_eval(&d, buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);
if (res < 0) {
av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);
return res;
}
}
}
if (o->type == AV_OPT_TYPE_FLAGS) {
read_number(o, dst, NULL, NULL, &intnum);
if (cmd == '+')
d = intnum | (int64_t)d;
else if (cmd == '-')
d = intnum & ~(int64_t)d;
} else {
read_number(o, dst, &num, &den, &intnum);
if (cmd == '+')
d = notfirst * num * intnum / den + d;
else if (cmd == '-')
d = notfirst * num * intnum / den - d;
}
if ((ret = write_number(obj, o, dst, d, 1, 1)) < 0)
return ret;
val += i;
if (!*val)
return 0;
notfirst = 1;
}
}
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
{
void *dst, *target_obj;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
if (!val || o->flags & AV_OPT_FLAG_READONLY)
return AVERROR(EINVAL);
dst = ((uint8_t *)target_obj) + o->offset;
switch (o->type) {
case AV_OPT_TYPE_STRING:
return set_string(obj, o, val, dst);
case AV_OPT_TYPE_BINARY:
return set_string_binary(obj, o, val, dst);
case AV_OPT_TYPE_FLAGS:
case AV_OPT_TYPE_INT:
case AV_OPT_TYPE_INT64:
case AV_OPT_TYPE_FLOAT:
case AV_OPT_TYPE_DOUBLE:
case AV_OPT_TYPE_RATIONAL:
return set_string_number(obj, target_obj, o, val, dst);
}
av_log(obj, AV_LOG_ERROR, "Invalid option type.\n");
return AVERROR(EINVAL);
}
#define OPT_EVAL_NUMBER(name, opttype, vartype) \
int av_opt_eval_ ## name(void *obj, const AVOption *o, \
const char *val, vartype *name ## _out) \
{ \
if (!o || o->type != opttype || o->flags & AV_OPT_FLAG_READONLY) \
return AVERROR(EINVAL); \
return set_string_number(obj, obj, o, val, name ## _out); \
}
OPT_EVAL_NUMBER(flags, AV_OPT_TYPE_FLAGS, int)
OPT_EVAL_NUMBER(int, AV_OPT_TYPE_INT, int)
OPT_EVAL_NUMBER(int64, AV_OPT_TYPE_INT64, int64_t)
OPT_EVAL_NUMBER(float, AV_OPT_TYPE_FLOAT, float)
OPT_EVAL_NUMBER(double, AV_OPT_TYPE_DOUBLE, double)
OPT_EVAL_NUMBER(q, AV_OPT_TYPE_RATIONAL, AVRational)
static int set_number(void *obj, const char *name, double num, int den, int64_t intnum,
int search_flags)
{
void *dst, *target_obj;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
if (o->flags & AV_OPT_FLAG_READONLY)
return AVERROR(EINVAL);
dst = ((uint8_t *)target_obj) + o->offset;
return write_number(obj, o, dst, num, den, intnum);
}
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
{
return set_number(obj, name, 1, 1, val, search_flags);
}
int av_opt_set_double(void *obj, const char *name, double val, int search_flags)
{
return set_number(obj, name, val, 1, 1, search_flags);
}
int av_opt_set_q(void *obj, const char *name, AVRational val, int search_flags)
{
return set_number(obj, name, val.num, val.den, 1, search_flags);
}
int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)
{
void *target_obj;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
uint8_t *ptr;
uint8_t **dst;
int *lendst;
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
if (o->type != AV_OPT_TYPE_BINARY || o->flags & AV_OPT_FLAG_READONLY)
return AVERROR(EINVAL);
ptr = av_malloc(len);
if (!ptr)
return AVERROR(ENOMEM);
dst = (uint8_t **)(((uint8_t *)target_obj) + o->offset);
lendst = (int *)(dst + 1);
av_free(*dst);
*dst = ptr;
*lendst = len;
memcpy(ptr, val, len);
return 0;
}
int av_opt_set_dict_val(void *obj, const char *name, const AVDictionary *val,
int search_flags)
{
void *target_obj;
AVDictionary **dst;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
if (o->flags & AV_OPT_FLAG_READONLY)
return AVERROR(EINVAL);
dst = (AVDictionary **)(((uint8_t *)target_obj) + o->offset);
av_dict_free(dst);
av_dict_copy(dst, val, 0);
return 0;
}
int av_opt_get(void *obj, const char *name, int search_flags, uint8_t **out_val)
{
void *dst, *target_obj;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
uint8_t *bin, buf[128];
int len, i, ret;
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
dst = (uint8_t *)target_obj + o->offset;
buf[0] = 0;
switch (o->type) {
case AV_OPT_TYPE_FLAGS:
ret = snprintf(buf, sizeof(buf), "0x%08X", *(int *)dst);
break;
case AV_OPT_TYPE_INT:
ret = snprintf(buf, sizeof(buf), "%d", *(int *)dst);
break;
case AV_OPT_TYPE_INT64:
ret = snprintf(buf, sizeof(buf), "%" PRId64, *(int64_t *)dst);
break;
case AV_OPT_TYPE_FLOAT:
ret = snprintf(buf, sizeof(buf), "%f", *(float *)dst);
break;
case AV_OPT_TYPE_DOUBLE:
ret = snprintf(buf, sizeof(buf), "%f", *(double *)dst);
break;
case AV_OPT_TYPE_RATIONAL:
ret = snprintf(buf, sizeof(buf), "%d/%d", ((AVRational *)dst)->num,
((AVRational *)dst)->den);
break;
case AV_OPT_TYPE_STRING:
if (*(uint8_t **)dst)
*out_val = av_strdup(*(uint8_t **)dst);
else
*out_val = av_strdup("");
return *out_val ? 0 : AVERROR(ENOMEM);
case AV_OPT_TYPE_BINARY:
len = *(int *)(((uint8_t *)dst) + sizeof(uint8_t *));
if ((uint64_t)len * 2 + 1 > INT_MAX)
return AVERROR(EINVAL);
if (!(*out_val = av_malloc(len * 2 + 1)))
return AVERROR(ENOMEM);
bin = *(uint8_t **)dst;
for (i = 0; i < len; i++)
snprintf(*out_val + i * 2, 3, "%02X", bin[i]);
return 0;
default:
return AVERROR(EINVAL);
}
if (ret >= sizeof(buf))
return AVERROR(EINVAL);
*out_val = av_strdup(buf);
return *out_val ? 0 : AVERROR(ENOMEM);
}
static int get_number(void *obj, const char *name, double *num, int *den, int64_t *intnum,
int search_flags)
{
void *dst, *target_obj;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
if (!o || !target_obj)
goto error;
dst = ((uint8_t *)target_obj) + o->offset;
return read_number(o, dst, num, den, intnum);
error:
*den =
*intnum = 0;
return -1;
}
int av_opt_get_int(void *obj, const char *name, int search_flags, int64_t *out_val)
{
int64_t intnum = 1;
double num = 1;
int ret, den = 1;
if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)
return ret;
*out_val = num * intnum / den;
return 0;
}
int av_opt_get_double(void *obj, const char *name, int search_flags, double *out_val)
{
int64_t intnum = 1;
double num = 1;
int ret, den = 1;
if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)
return ret;
*out_val = num * intnum / den;
return 0;
}
int av_opt_get_q(void *obj, const char *name, int search_flags, AVRational *out_val)
{
int64_t intnum = 1;
double num = 1;
int ret, den = 1;
if ((ret = get_number(obj, name, &num, &den, &intnum, search_flags)) < 0)
return ret;
if (num == 1.0 && (int)intnum == intnum)
*out_val = (AVRational) { intnum, den };
else
*out_val = av_d2q(num * intnum / den, 1 << 24);
return 0;
}
int av_opt_get_dict_val(void *obj, const char *name, int search_flags, AVDictionary **out_val)
{
void *target_obj;
AVDictionary *src;
const AVOption *o = av_opt_find2(obj, name, NULL, 0, search_flags, &target_obj);
if (!o || !target_obj)
return AVERROR_OPTION_NOT_FOUND;
if (o->type != AV_OPT_TYPE_DICT)
return AVERROR(EINVAL);
src = *(AVDictionary **)(((uint8_t *)target_obj) + o->offset);
av_dict_copy(out_val, src, 0);
return 0;
}
int av_opt_flag_is_set(void *obj, const char *field_name, const char *flag_name)
{
const AVOption *field = av_opt_find(obj, field_name, NULL, 0, 0);
const AVOption *flag = av_opt_find(obj, flag_name,
field ? field->unit : NULL, 0, 0);
int64_t res;
if (!field || !flag || flag->type != AV_OPT_TYPE_CONST ||
av_opt_get_int(obj, field_name, 0, &res) < 0)
return 0;
return res & flag->default_val.i64;
}
static void opt_list(void *obj, void *av_log_obj, const char *unit,
int req_flags, int rej_flags)
{
const AVOption *opt = NULL;
while ((opt = av_opt_next(obj, opt))) {
if (!(opt->flags & req_flags) || (opt->flags & rej_flags))
continue;
/* Don't print CONST's on level one.
* Don't print anything but CONST's on level two.
* Only print items from the requested unit.
*/
if (!unit && opt->type == AV_OPT_TYPE_CONST)
continue;
else if (unit && opt->type != AV_OPT_TYPE_CONST)
continue;
else if (unit && opt->type == AV_OPT_TYPE_CONST && strcmp(unit, opt->unit))
continue;
else if (unit && opt->type == AV_OPT_TYPE_CONST)
av_log(av_log_obj, AV_LOG_INFO, " %-15s ", opt->name);
else
av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
switch (opt->type) {
case AV_OPT_TYPE_FLAGS:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>");
break;
case AV_OPT_TYPE_INT:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int>");
break;
case AV_OPT_TYPE_INT64:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>");
break;
case AV_OPT_TYPE_DOUBLE:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<double>");
break;
case AV_OPT_TYPE_FLOAT:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<float>");
break;
case AV_OPT_TYPE_STRING:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<string>");
break;
case AV_OPT_TYPE_RATIONAL:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>");
break;
case AV_OPT_TYPE_BINARY:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>");
break;
case AV_OPT_TYPE_CONST:
default:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "");
break;
}
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM) ? 'V' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM) ? 'A' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_EXPORT) ? 'X' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_READONLY) ? 'R' : '.');
if (opt->help)
av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
av_log(av_log_obj, AV_LOG_INFO, "\n");
if (opt->unit && opt->type != AV_OPT_TYPE_CONST)
opt_list(obj, av_log_obj, opt->unit, req_flags, rej_flags);
}
}
int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
{
if (!obj)
return -1;
av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass **)obj)->class_name);
opt_list(obj, av_log_obj, NULL, req_flags, rej_flags);
return 0;
}
void av_opt_set_defaults(void *s)
{
const AVOption *opt = NULL;
while ((opt = av_opt_next(s, opt))) {
if (opt->flags & AV_OPT_FLAG_READONLY)
continue;
switch (opt->type) {
case AV_OPT_TYPE_CONST:
/* Nothing to be done here */
break;
case AV_OPT_TYPE_FLAGS:
case AV_OPT_TYPE_INT:
case AV_OPT_TYPE_INT64:
av_opt_set_int(s, opt->name, opt->default_val.i64, 0);
break;
case AV_OPT_TYPE_DOUBLE:
case AV_OPT_TYPE_FLOAT:
{
double val;
val = opt->default_val.dbl;
av_opt_set_double(s, opt->name, val, 0);
}
break;
case AV_OPT_TYPE_RATIONAL:
{
AVRational val;
val = av_d2q(opt->default_val.dbl, INT_MAX);
av_opt_set_q(s, opt->name, val, 0);
}
break;
case AV_OPT_TYPE_STRING:
av_opt_set(s, opt->name, opt->default_val.str, 0);
break;
case AV_OPT_TYPE_BINARY:
case AV_OPT_TYPE_DICT:
/* Cannot set defaults for these types */
break;
default:
av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n",
opt->type, opt->name);
}
}
}
/**
* Store the value in the field in ctx that is named like key.
* ctx must be an AVClass context, storing is done using AVOptions.
*
* @param buf the string to parse, buf will be updated to point at the
* separator just after the parsed key/value pair
* @param key_val_sep a 0-terminated list of characters used to
* separate key from value
* @param pairs_sep a 0-terminated list of characters used to separate
* two pairs from each other
* @return 0 if the key/value pair has been successfully parsed and
* set, or a negative value corresponding to an AVERROR code in case
* of error:
* AVERROR(EINVAL) if the key/value pair cannot be parsed,
* the error code issued by av_opt_set() if the key/value pair
* cannot be set
*/
static int parse_key_value_pair(void *ctx, const char **buf,
const char *key_val_sep, const char *pairs_sep)
{
char *key = av_get_token(buf, key_val_sep);
char *val;
int ret;
if (!key)
return AVERROR(ENOMEM);
if (*key && strspn(*buf, key_val_sep)) {
(*buf)++;
val = av_get_token(buf, pairs_sep);
if (!val) {
av_freep(&key);
return AVERROR(ENOMEM);
}
} else {
av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);
av_free(key);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_DEBUG, "Setting value '%s' for key '%s'\n", val, key);
ret = av_opt_set(ctx, key, val, AV_OPT_SEARCH_CHILDREN);
if (ret == AVERROR_OPTION_NOT_FOUND)
av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);
av_free(key);
av_free(val);
return ret;
}
int av_set_options_string(void *ctx, const char *opts,
const char *key_val_sep, const char *pairs_sep)
{
int ret, count = 0;
if (!opts)
return 0;
while (*opts) {
if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)
return ret;
count++;
if (*opts)
opts++;
}
return count;
}
void av_opt_free(void *obj)
{
const AVOption *o = NULL;
while ((o = av_opt_next(obj, o))) {
switch (o->type) {
case AV_OPT_TYPE_STRING:
case AV_OPT_TYPE_BINARY:
av_freep((uint8_t *)obj + o->offset);
break;
case AV_OPT_TYPE_DICT:
av_dict_free((AVDictionary **)(((uint8_t *)obj) + o->offset));
break;
default:
break;
}
}
}
int av_opt_set_dict(void *obj, AVDictionary **options)
{
AVDictionaryEntry *t = NULL;
AVDictionary *tmp = NULL;
int ret = 0;
while ((t = av_dict_get(*options, "", t, AV_DICT_IGNORE_SUFFIX))) {
ret = av_opt_set(obj, t->key, t->value, 0);
if (ret == AVERROR_OPTION_NOT_FOUND)
av_dict_set(&tmp, t->key, t->value, 0);
else if (ret < 0) {
av_log(obj, AV_LOG_ERROR, "Error setting option %s to value %s.\n", t->key, t->value);
break;
}
ret = 0;
}
av_dict_free(options);
*options = tmp;
return ret;
}
const AVOption *av_opt_find(void *obj, const char *name, const char *unit,
int opt_flags, int search_flags)
{
return av_opt_find2(obj, name, unit, opt_flags, search_flags, NULL);
}
const AVOption *av_opt_find2(void *obj, const char *name, const char *unit,
int opt_flags, int search_flags, void **target_obj)
{
const AVClass *c = *(AVClass **)obj;
const AVOption *o = NULL;
if (!c)
return NULL;
if (search_flags & AV_OPT_SEARCH_CHILDREN) {
if (search_flags & AV_OPT_SEARCH_FAKE_OBJ) {
const AVClass *child = NULL;
while (child = av_opt_child_class_next(c, child))
if (o = av_opt_find2(&child, name, unit, opt_flags, search_flags, NULL))
return o;
} else {
void *child = NULL;
while (child = av_opt_child_next(obj, child))
if (o = av_opt_find2(child, name, unit, opt_flags, search_flags, target_obj))
return o;
}
}
while (o = av_opt_next(obj, o)) {
if (!strcmp(o->name, name) && (o->flags & opt_flags) == opt_flags &&
((!unit && o->type != AV_OPT_TYPE_CONST) ||
(unit && o->unit && !strcmp(o->unit, unit)))) {
if (target_obj) {
if (!(search_flags & AV_OPT_SEARCH_FAKE_OBJ))
*target_obj = obj;
else
*target_obj = NULL;
}
return o;
}
}
return NULL;
}
void *av_opt_child_next(void *obj, void *prev)
{
const AVClass *c = *(AVClass **)obj;
if (c->child_next)
return c->child_next(obj, prev);
return NULL;
}
const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *prev)
{
if (parent->child_class_next)
return parent->child_class_next(prev);
return NULL;
}
static int opt_size(enum AVOptionType type)
{
switch (type) {
case AV_OPT_TYPE_INT:
case AV_OPT_TYPE_FLAGS:
return sizeof(int);
case AV_OPT_TYPE_INT64:
return sizeof(int64_t);
case AV_OPT_TYPE_DOUBLE:
return sizeof(double);
case AV_OPT_TYPE_FLOAT:
return sizeof(float);
case AV_OPT_TYPE_STRING:
return sizeof(uint8_t *);
case AV_OPT_TYPE_RATIONAL:
return sizeof(AVRational);
case AV_OPT_TYPE_BINARY:
return sizeof(uint8_t *) + sizeof(int);
}
return AVERROR(EINVAL);
}
int av_opt_copy(void *dst, const void *src)
{
const AVOption *o = NULL;
const AVClass *c;
int ret = 0;
if (!src)
return AVERROR(EINVAL);
c = *(AVClass **)src;
if (!c || c != *(AVClass **)dst)
return AVERROR(EINVAL);
while ((o = av_opt_next(src, o))) {
void *field_dst = (uint8_t *)dst + o->offset;
void *field_src = (uint8_t *)src + o->offset;
uint8_t **field_dst8 = (uint8_t **)field_dst;
uint8_t **field_src8 = (uint8_t **)field_src;
if (o->type == AV_OPT_TYPE_STRING) {
set_string(dst, o, *field_src8, field_dst8);
if (*field_src8 && !*field_dst8)
ret = AVERROR(ENOMEM);
} else if (o->type == AV_OPT_TYPE_BINARY) {
int len = *(int *)(field_src8 + 1);
if (*field_dst8 != *field_src8)
av_freep(field_dst8);
if (len) {
*field_dst8 = av_malloc(len);
if (!*field_dst8) {
ret = AVERROR(ENOMEM);
len = 0;
}
memcpy(*field_dst8, *field_src8, len);
} else {
*field_dst8 = NULL;
}
*(int *)(field_dst8 + 1) = len;
} else if (o->type == AV_OPT_TYPE_CONST) {
// do nothing
} else {
int size = opt_size(o->type);
if (size < 0)
ret = size;
else
memcpy(field_dst, field_src, size);
}
}
return ret;
}