lavu/opt: factorize setting of format values from string

Simplify incoming patch.

libavutil/opt.c

@@ -295,6 +295,42 @@ static int set_string_color(void *obj, const AVOption *o, const char *val, uint8
     return 0;
 }
 
+static int set_string_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst,
+                          int fmt_nb, int ((*get_fmt)(const char *)), const char *desc)
+{
+    int fmt;
+
+    if (!val || !strcmp(val, "none")) {
+        fmt = -1;
+    } else {
+        fmt = get_fmt(val);
+        if (fmt == -1) {
+            char *tail;
+            fmt = strtol(val, &tail, 0);
+            if (*tail || (unsigned)fmt >= fmt_nb) {
+                av_log(obj, AV_LOG_ERROR,
+                       "Unable to parse option value \"%s\" as %s\n", val, desc);
+                return AVERROR(EINVAL);
+            }
+        }
+    }
+
+    *(int *)dst = fmt;
+    return 0;
+}
+
+static int set_string_pixel_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst)
+{
+    return set_string_fmt(obj, o, val, dst,
+                          AV_PIX_FMT_NB, av_get_pix_fmt, "pixel format");
+}
+
+static int set_string_sample_fmt(void *obj, const AVOption *o, const char *val, uint8_t *dst)
+{
+    return set_string_fmt(obj, o, val, dst,
+                          AV_SAMPLE_FMT_NB, av_get_sample_fmt, "sample format");
+}
+
 #if FF_API_OLD_AVOPTIONS
 int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out)
 {
@@ -331,38 +367,8 @@ int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
     case AV_OPT_TYPE_RATIONAL: return set_string_number(obj, target_obj, o, val, dst);
     case AV_OPT_TYPE_IMAGE_SIZE: return set_string_image_size(obj, o, val, dst);
     case AV_OPT_TYPE_VIDEO_RATE: return set_string_video_rate(obj, o, val, dst);
-    case AV_OPT_TYPE_PIXEL_FMT:
-        if (!val || !strcmp(val, "none")) {
-            ret = AV_PIX_FMT_NONE;
-        } else {
-            ret = av_get_pix_fmt(val);
-            if (ret == AV_PIX_FMT_NONE) {
-                char *tail;
-                ret = strtol(val, &tail, 0);
-                if (*tail || (unsigned)ret >= AV_PIX_FMT_NB) {
-                    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as pixel format\n", val);
-                    return AVERROR(EINVAL);
-                }
-            }
-        }
-        *(enum AVPixelFormat *)dst = ret;
-        return 0;
-    case AV_OPT_TYPE_SAMPLE_FMT:
-        if (!val || !strcmp(val, "none")) {
-            ret = AV_SAMPLE_FMT_NONE;
-        } else {
-            ret = av_get_sample_fmt(val);
-            if (ret == AV_SAMPLE_FMT_NONE) {
-                char *tail;
-                ret = strtol(val, &tail, 0);
-                if (*tail || (unsigned)ret >= AV_SAMPLE_FMT_NB) {
-                    av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\" as sample format\n", val);
-                    return AVERROR(EINVAL);
-                }
-            }
-        }
-        *(enum AVSampleFormat *)dst = ret;
-        return 0;
+    case AV_OPT_TYPE_PIXEL_FMT:  return set_string_pixel_fmt(obj, o, val, dst);
+    case AV_OPT_TYPE_SAMPLE_FMT: return set_string_sample_fmt(obj, o, val, dst);
     case AV_OPT_TYPE_DURATION:
         if (!val) {
             *(int64_t *)dst = 0;