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opt: Add av_opt_copy()

Browse source 
This includes documentation and other modifications by
Lukasz Marek and Martin Storsjö.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Michael Niedermayer 2014-05-30 21:04:14 +02:00 • committed by Martin Storsjö
parent 8833f1508b
commit 564b4591bb
4 changed files with 84 additions and 2 deletions
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66
libavutil/opt.c
View file

@ -757,6 +757,72 @@ const AVClass *av_opt_child_class_next(const AVClass *parent, const AVClass *pre
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;
}
#ifdef TEST
typedef struct TestContext