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lavu/opt: introduce av_opt_serialize()

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Function allows to create string containing object's serialized options.
Such string may be passed back to av_set_options_string() in order to restore options.

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
This commit is contained in:
Lukasz Marek 2014-11-10 22:28:44 +01:00
parent eec693328a
commit bee5844ddd
5 changed files with 102 additions and 1 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2014-08-09
API changes, most recent first:
2014-11-16 - xxxxxxx - lavu 54.13.0 - opt.h
Add av_opt_serialize().
2014-11-16 - xxxxxxx - lavu 54.12.0 - opt.h
Add av_opt_is_set_to_default().

69
libavutil/opt.c
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@ -37,6 +37,7 @@
#include "pixdesc.h"
#include "mathematics.h"
#include "samplefmt.h"
#include "bprint.h"
#include <float.h>
@ -1835,6 +1836,44 @@ int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_fla
return av_opt_is_set_to_default(target, o);
}
int av_opt_serialize(void *obj, int opt_flags, int flags, char **buffer,
const char key_val_sep, const char pairs_sep)
{
const AVOption *o = NULL;
uint8_t *buf;
AVBPrint bprint;
int ret, cnt = 0;
if (!obj || !buffer)
return AVERROR(EINVAL);
*buffer = NULL;
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
while (o = av_opt_next(obj, o)) {
if (o->type == AV_OPT_TYPE_CONST)
continue;
if ((flags & AV_OPT_SERIALIZE_OPT_FLAGS_EXACT) && o->flags != opt_flags)
continue;
else if (((o->flags & opt_flags) != opt_flags))
continue;
if (flags & AV_OPT_SERIALIZE_SKIP_DEFAULTS && av_opt_is_set_to_default(obj, o) > 0)
continue;
if ((ret = av_opt_get(obj, o->name, 0, &buf)) < 0) {
av_bprint_finalize(&bprint, NULL);
return ret;
}
if (buf) {
if (cnt++)
av_bprint_append_data(&bprint, &pairs_sep, 1);
av_bprintf(&bprint, "%s%c%s", o->name, key_val_sep, buf);
av_freep(&buf);
}
}
av_bprint_finalize(&bprint, buffer);
return 0;
}
#ifdef TEST
typedef struct TestContext
@ -1854,6 +1893,10 @@ typedef struct TestContext
int64_t channel_layout;
void *binary;
int binary_size;
void *binary1;
int binary_size1;
void *binary2;
int binary_size2;
int64_t num64;
float flt;
double dbl;
@ -1882,6 +1925,8 @@ static const AVOption test_options[]= {
{"color", "set color", OFFSET(color), AV_OPT_TYPE_COLOR, {.str = "pink"}, 0, 0},
{"cl", "set channel layout", OFFSET(channel_layout), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64 = AV_CH_LAYOUT_HEXAGONAL}, 0, INT64_MAX},
{"bin", "set binary value", OFFSET(binary), AV_OPT_TYPE_BINARY, {.str="62696e00"}, 0, 0 },
{"bin1", "set binary value", OFFSET(binary1), AV_OPT_TYPE_BINARY, {.str=NULL}, 0, 0 },
{"bin2", "set binary value", OFFSET(binary2), AV_OPT_TYPE_BINARY, {.str=""}, 0, 0 },
{"num64", "set num 64bit", OFFSET(num64), AV_OPT_TYPE_INT64, {.i64 = 1}, 0, 100 },
{"flt", "set float", OFFSET(flt), AV_OPT_TYPE_FLOAT, {.dbl = 1.0/3}, 0, 100 },
{"dbl", "set double", OFFSET(dbl), AV_OPT_TYPE_DOUBLE, {.dbl = 1.0/3}, 0, 100 },
@ -1951,6 +1996,30 @@ int main(void)
av_opt_free(&test_ctx);
}
printf("\nTest av_opt_serialize()\n");
{
TestContext test_ctx = { 0 };
char *buf;
test_ctx.class = &test_class;
av_log_set_level(AV_LOG_QUIET);
av_opt_set_defaults(&test_ctx);
if (av_opt_serialize(&test_ctx, 0, 0, &buf, '=', ',') >= 0) {
printf("%s\n", buf);
av_opt_free(&test_ctx);
memset(&test_ctx, 0, sizeof(test_ctx));
test_ctx.class = &test_class;
av_set_options_string(&test_ctx, buf, "=", ",");
av_free(buf);
if (av_opt_serialize(&test_ctx, 0, 0, &buf, '=', ',') >= 0) {
printf("%s\n", buf);
av_free(buf);
}
}
av_opt_free(&test_ctx);
}
printf("\nTesting av_set_options_string()\n");
{
TestContext test_ctx = { 0 };

21
libavutil/opt.h
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@ -869,6 +869,27 @@ int av_opt_is_set_to_default(void *obj, const AVOption *o);
*/
int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_flags);
#define AV_OPT_SERIALIZE_SKIP_DEFAULTS 0x00000001 ///< Serialize options that are not set to default values only.
#define AV_OPT_SERIALIZE_OPT_FLAGS_EXACT 0x00000002 ///< Serialize options that exactly match opt_flags only.
/**
* Serialize object's options.
*
* Create a string containing object's serialized options.
* Such string may be passed back to av_opt_set_from_string() in order to restore option values.
*
* @param[in] obj AVClass object to serialize
* @param[in] opt_flags serialize options with all the specified flags set (AV_OPT_FLAG)
* @param[in] flags combination of AV_OPT_SERIALIZE_* flags
* @param[out] buffer Pointer to buffer that will be allocated with string containg serialized options.
* Buffer must be freed by the caller when is no longer needed.
* @param[in] key_val_sep character used to separate key from value
* @param[in] pairs_sep character used to separate two pairs from each other
* @return >= 0 on success, negative on error
*/
int av_opt_serialize(void *obj, int opt_flags, int flags, char **buffer,
const char key_val_sep, const char pairs_sep);
/**
* @}
*/

2
libavutil/version.h
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@ -56,7 +56,7 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 54
#define LIBAVUTIL_VERSION_MINOR 12
#define LIBAVUTIL_VERSION_MINOR 13
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

8
tests/ref/fate/opt
View File

@ -34,6 +34,8 @@ name: duration default:0 error:
name: color default:0 error:
name: cl default:0 error:
name: bin default:0 error:
name: bin1 default:1 error:
name: bin2 default:1 error:
name: num64 default:0 error:
name: flt default:0 error:
name: dbl default:0 error:
@ -53,10 +55,16 @@ name: duration default:1 error:
name: color default:1 error:
name: cl default:1 error:
name: bin default:1 error:
name: bin1 default:1 error:
name: bin2 default:1 error:
name: num64 default:1 error:
name: flt default:1 error:
name: dbl default:1 error:
Test av_opt_serialize()
num=0,toggle=1,rational=1/1,string=default,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0:00:00.001000,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333
num=0,toggle=1,rational=1/1,string=default,flags=0x00000001,size=200x300,pix_fmt=0bgr,sample_fmt=s16,video_rate=25/1,duration=0:00:00.001000,color=0xffc0cbff,cl=0x137,bin=62696E00,bin1=,bin2=,num64=1,flt=0.333333,dbl=0.333333
Testing av_set_options_string()
OK ''
Error ':'