[FFmpeg-devel] [PATCH v5 3/4] avfilter/vf_showinfo: display user data unregistered message

[lance.lmwang at gmail.com]

From: Limin Wang <lance.lmwang at gmail.com>

Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
 libavfilter/vf_showinfo.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
index 31f6b32..bb3b37e 100644
--- a/libavfilter/vf_showinfo.c
+++ b/libavfilter/vf_showinfo.c
@@ -169,6 +169,36 @@ static void dump_content_light_metadata(AVFilterContext *ctx, AVFrameSideData *s
            metadata->MaxCLL, metadata->MaxFALL);
 }
 
+static int string_is_ascii(const uint8_t *str)
+{
+    while (*str && *str < 128) str++;
+    return !*str;
+}
+
+static void dump_user_data_unregistered_metadata(AVFilterContext *ctx, AVFrameSideData *sd)
+{
+    const int uuid_size = 16;
+    uint8_t *user_data = sd->data;
+
+    if (sd->size < uuid_size) {
+        av_log(ctx, AV_LOG_ERROR, "invalid data(%d < UUID(%d-bytes))", sd->size, uuid_size);
+        return;
+    }
+
+    av_log(ctx, AV_LOG_INFO, "User Data Unregistered:\n");
+    av_log(ctx, AV_LOG_INFO, "UUID=");
+    for (int i = 0; i < uuid_size; i++)
+        av_log(ctx, AV_LOG_INFO, "%x", user_data[i]);
+    av_log(ctx, AV_LOG_INFO, "\n");
+
+    user_data += uuid_size;
+    /* Only print the user data details if it's string */
+    if (string_is_ascii(user_data)) {
+        av_log(ctx, AV_LOG_INFO, "User Data=");
+        av_log(ctx, AV_LOG_INFO, "%s", user_data);
+    }
+}
+
 static void dump_color_property(AVFilterContext *ctx, AVFrame *frame)
 {
     const char *color_range_str     = av_color_range_name(frame->color_range);
@@ -319,6 +349,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
             av_log(ctx, AV_LOG_INFO, "GOP timecode - %s", tcbuf);
             break;
         }
+        case AV_FRAME_DATA_USER_DATA_UNREGISTERED:
+            dump_user_data_unregistered_metadata(ctx, sd);
+            break;
         default:
             av_log(ctx, AV_LOG_WARNING, "unknown side data type %d (%d bytes)",
                    sd->type, sd->size);
-- 
2.9.5