[FFmpeg-devel] [PATCH v2 3/5] 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 | 40 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
index 31f6b32aa4..77ee7f312c 100644
--- a/libavfilter/vf_showinfo.c
+++ b/libavfilter/vf_showinfo.c
@@ -169,6 +169,43 @@ static void dump_content_light_metadata(AVFilterContext *ctx, AVFrameSideData *s
            metadata->MaxCLL, metadata->MaxFALL);
 }
 
+static int is_ascii(uint8_t ch)
+{
+    if (ch >= 32 && ch <= 127)
+        return 1;
+    else
+        return 0;
+}
+
+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");
+    av_log(ctx, AV_LOG_INFO, "User Data=");
+    for (int i = uuid_size; i < sd->size; i++) {
+        /* printable ascii */
+        if (is_ascii(*(user_data + i))) {
+            av_log(ctx, AV_LOG_INFO, "%c", *(user_data + i));
+        } else {
+            /* don't print the last byte `\0` character for ascii */
+            if ((i == sd->size - 1) && *(user_data + i) == 0)
+                continue;
+            av_log(ctx, AV_LOG_INFO, "%x", *(user_data + i));
+        }
+    }
+}
+
 static void dump_color_property(AVFilterContext *ctx, AVFrame *frame)
 {
     const char *color_range_str     = av_color_range_name(frame->color_range);
@@ -319,6 +356,9 @@ 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);
-- 
2.21.0