opt: Add av_opt_set_bin()

Introduce a new function to set binary data through AVOption,
avoiding having to convert the binary data to a string inbetween.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 29 insertions, 0 deletions

diff --git a/libavutil/opt.c b/libavutil/opt.c
index 7c53024d25..af8df7a2eb 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -316,6 +316,35 @@ 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)
+        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;
+}
+
 #if FF_API_OLD_AVOPTIONS
 /**
  *