+int av_opt_is_set_to_default(void *obj, const AVOption *o)
+{
+ int64_t i64;
+ double d, d2;
+ float f;
+ AVRational q;
+ int ret, w, h;
+ char *str;
+ void *dst;
+
+ if (!o || !obj)
+ return AVERROR(EINVAL);
+
+ dst = ((uint8_t*)obj) + o->offset;
+
+ switch (o->type) {
+ case AV_OPT_TYPE_CONST:
+ return 1;
+ case AV_OPT_TYPE_FLAGS:
+ case AV_OPT_TYPE_PIXEL_FMT:
+ case AV_OPT_TYPE_SAMPLE_FMT:
+ case AV_OPT_TYPE_INT:
+ case AV_OPT_TYPE_CHANNEL_LAYOUT:
+ case AV_OPT_TYPE_DURATION:
+ case AV_OPT_TYPE_INT64:
+ read_number(o, dst, NULL, NULL, &i64);
+ return o->default_val.i64 == i64;
+ case AV_OPT_TYPE_STRING:
+ str = *(char **)dst;
+ if (str == o->default_val.str) //2 NULLs
+ return 1;
+ if (!str || !o->default_val.str) //1 NULL
+ return 0;
+ return !strcmp(str, o->default_val.str);
+ case AV_OPT_TYPE_DOUBLE:
+ read_number(o, dst, &d, NULL, NULL);
+ return o->default_val.dbl == d;
+ case AV_OPT_TYPE_FLOAT:
+ read_number(o, dst, &d, NULL, NULL);
+ f = o->default_val.dbl;
+ d2 = f;
+ return d2 == d;
+ case AV_OPT_TYPE_RATIONAL:
+ q = av_d2q(o->default_val.dbl, INT_MAX);
+ return !av_cmp_q(*(AVRational*)dst, q);
+ case AV_OPT_TYPE_BINARY: {
+ struct {
+ uint8_t *data;
+ int size;
+ } tmp = {0};
+ int opt_size = *(int *)((void **)dst + 1);
+ void *opt_ptr = *(void **)dst;
+ if (!opt_ptr && (!o->default_val.str || !strlen(o->default_val.str)))
+ return 1;
+ if (opt_ptr && o->default_val.str && !strlen(o->default_val.str))
+ return 0;
+ if (opt_size != strlen(o->default_val.str) / 2)
+ return 0;
+ ret = set_string_binary(NULL, NULL, o->default_val.str, &tmp.data);
+ if (!ret)
+ ret = !memcmp(opt_ptr, tmp.data, tmp.size);
+ av_free(tmp.data);
+ return ret;
+ }
+ case AV_OPT_TYPE_DICT:
+ /* Binary and dict have not default support yet. Any pointer is not default. */
+ return !!(*(void **)dst);
+ case AV_OPT_TYPE_IMAGE_SIZE:
+ if (!o->default_val.str || !strcmp(o->default_val.str, "none"))
+ w = h = 0;
+ else if ((ret = av_parse_video_size(&w, &h, o->default_val.str)) < 0)
+ return ret;
+ return (w == *(int *)dst) && (h == *((int *)dst+1));
+ case AV_OPT_TYPE_VIDEO_RATE:
+ q = (AVRational){0, 0};
+ if (o->default_val.str)
+ av_parse_video_rate(&q, o->default_val.str);
+ return !av_cmp_q(*(AVRational*)dst, q);
+ case AV_OPT_TYPE_COLOR: {
+ uint8_t color[4] = {0, 0, 0, 0};
+ if (o->default_val.str)
+ av_parse_color(color, o->default_val.str, -1, NULL);
+ return !memcmp(color, dst, sizeof(color));
+ }
+ default:
+ av_log(obj, AV_LOG_WARNING, "Not supported option type: %d, option name: %s\n", o->type, o->name);
+ break;
+ }
+ return AVERROR_PATCHWELCOME;
+}
+
+int av_opt_is_set_to_default_by_name(void *obj, const char *name, int search_flags)
+{
+ const AVOption *o;
+ void *target;
+ if (!obj)
+ return AVERROR(EINVAL);
+ o = av_opt_find2(obj, name, NULL, 0, search_flags, &target);
+ if (!o)
+ return AVERROR_OPTION_NOT_FOUND;
+ 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;
+ const char special_chars[] = {pairs_sep, key_val_sep, '\0'};
+
+ if (pairs_sep == '\0' || key_val_sep == '\0' || pairs_sep == key_val_sep ||
+ pairs_sep == '\\' || key_val_sep == '\\') {
+ av_log(obj, AV_LOG_ERROR, "Invalid separator(s) found.");
+ return AVERROR(EINVAL);
+ }
+
+ 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_bprint_escape(&bprint, o->name, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
+ av_bprint_append_data(&bprint, &key_val_sep, 1);
+ av_bprint_escape(&bprint, buf, special_chars, AV_ESCAPE_MODE_BACKSLASH, 0);
+ av_freep(&buf);
+ }
+ }
+ av_bprint_finalize(&bprint, buffer);
+ return 0;
+}
+