From c09b14c931e36c2648a269ac74c9df8eac64981e Mon Sep 17 00:00:00 2001
From: Edward Hervey <edward@collabora.com>
Date: Mon, 12 May 2014 13:45:06 +0200
Subject: [PATCH] flvdemux: Skip unknown tags in push-mode

We add a new mode (SKIP) in push-mode to skip tags that we don't known about

Partially fixes https://bugzilla.gnome.org/show_bug.cgi?id=670712
---
 gst/flv/gstflvdemux.c | 31 +++++++++++++++++++++----------
 gst/flv/gstflvdemux.h |  1 +
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/gst/flv/gstflvdemux.c b/gst/flv/gstflvdemux.c
index c058fda..7d13893 100644
--- a/gst/flv/gstflvdemux.c
+++ b/gst/flv/gstflvdemux.c
@@ -1683,6 +1683,16 @@ gst_flv_demux_parse_tag_type (GstFlvDemux * demux, GstBuffer * buffer)
 
   tag_type = map.data[0];
 
+  /* Tag size is 1 byte of type + 3 bytes of size + 7 bytes + tag data size +
+   * 4 bytes of previous tag size */
+  demux->tag_data_size = GST_READ_UINT24_BE (map.data + 1);
+  demux->tag_size = demux->tag_data_size + 11;
+
+  GST_LOG_OBJECT (demux, "tag data size is %" G_GUINT64_FORMAT,
+      demux->tag_data_size);
+
+  gst_buffer_unmap (buffer, &map);
+
   switch (tag_type) {
     case 9:
       demux->state = FLV_STATE_TAG_VIDEO;
@@ -1697,18 +1707,9 @@ gst_flv_demux_parse_tag_type (GstFlvDemux * demux, GstBuffer * buffer)
       break;
     default:
       GST_WARNING_OBJECT (demux, "unsupported tag type %u", tag_type);
+      demux->state = FLV_STATE_SKIP;
   }
 
-  /* Tag size is 1 byte of type + 3 bytes of size + 7 bytes + tag data size +
-   * 4 bytes of previous tag size */
-  demux->tag_data_size = GST_READ_UINT24_BE (map.data + 1);
-  demux->tag_size = demux->tag_data_size + 11;
-
-  GST_LOG_OBJECT (demux, "tag data size is %" G_GUINT64_FORMAT,
-      demux->tag_data_size);
-
-  gst_buffer_unmap (buffer, &map);
-
   return ret;
 }
 
@@ -2111,6 +2112,16 @@ parse:
       demux->state = FLV_STATE_TAG_TYPE;
       goto beach;
     }
+    case FLV_STATE_SKIP:
+      /* Skip unknown tags (set in _parse_tag_type()) */
+      if (gst_adapter_available (demux->adapter) >= demux->tag_size) {
+        gst_adapter_flush (demux->adapter, demux->tag_size);
+        demux->offset += demux->tag_size;
+        demux->state = FLV_STATE_TAG_TYPE;
+        goto parse;
+      } else {
+        goto beach;
+      }
     default:
       GST_DEBUG_OBJECT (demux, "unexpected demuxer state");
   }
diff --git a/gst/flv/gstflvdemux.h b/gst/flv/gstflvdemux.h
index 90953b4..79a8902 100644
--- a/gst/flv/gstflvdemux.h
+++ b/gst/flv/gstflvdemux.h
@@ -47,6 +47,7 @@ typedef enum
   FLV_STATE_TAG_SCRIPT,
   FLV_STATE_SEEK,
   FLV_STATE_DONE,
+  FLV_STATE_SKIP,
   FLV_STATE_NONE
 } GstFlvDemuxState;
 
-- 
2.7.4