From 0125d7525af00aef5e32792acb16ad550596e196 Mon Sep 17 00:00:00 2001
From: Edward Hervey <edward@centricular.com>
Date: Wed, 27 Apr 2022 09:22:40 +0200
Subject: [PATCH] parsebin: Expose streams of unknown type

This actually respects the existing `expose-all-streams` property by exposing
them and having them present in the stream collection (as streams of type
unknown).

Fixes #1179

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2309>
---
 .../gst/playback/gstparsebin.c                | 28 +++++++++++++++++--
 subprojects/gst-plugins-base/tools/gst-play.c |  2 +-
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/subprojects/gst-plugins-base/gst/playback/gstparsebin.c b/subprojects/gst-plugins-base/gst/playback/gstparsebin.c
index c1b7cae9dd..a8dca67fa3 100644
--- a/subprojects/gst-plugins-base/gst/playback/gstparsebin.c
+++ b/subprojects/gst-plugins-base/gst/playback/gstparsebin.c
@@ -1393,10 +1393,32 @@ analyze_new_pad (GstParseBin * parsebin, GstElement * src, GstPad * pad,
   if (factories == NULL)
     goto expose_pad;
 
-  /* if the array is empty, we have a type for which we have no parser */
+  /* if the array is empty, we have a type for which we have no handler */
   if (factories->n_values == 0) {
-    /* if not we have a unhandled type with no compatible factories */
     g_value_array_free (factories);
+
+    if (parsebin->expose_allstreams) {
+      GstStream *newstream;
+      GST_LOG_OBJECT (parsepad, "Existing GstStream %" GST_PTR_FORMAT,
+          parsepad->active_stream);
+      /* If we expose all streams, we only need to inform the application about
+       * a missing handler but still expose it. We also make sure the stream
+       * type is unknown. */
+      g_assert (parsepad->active_stream);
+      newstream =
+          gst_stream_new (gst_stream_get_stream_id (parsepad->active_stream),
+          caps, GST_STREAM_TYPE_UNKNOWN,
+          gst_stream_get_stream_flags (parsepad->active_stream));
+      gst_object_replace ((GstObject **) & parsepad->active_stream,
+          (GstObject *) newstream);
+      GST_LOG_OBJECT (parsepad, "New GstStream %" GST_PTR_FORMAT,
+          parsepad->active_stream);
+
+      gst_element_post_message (GST_ELEMENT_CAST (parsebin),
+          gst_missing_decoder_message_new (GST_ELEMENT_CAST (parsebin), caps));
+      goto expose_pad;
+    }
+    /* Else we will bail out */
     gst_object_unref (parsepad);
     goto unknown_type;
   }
@@ -4028,8 +4050,10 @@ gst_parse_pad_stream_start_event (GstParsePad * parsepad, GstEvent * event)
         GST_PTR_FORMAT, caps);
 
     if (repeat_event) {
+      GST_LOG_OBJECT (parsepad, "Using previously created GstStream");
       stream = gst_object_ref (parsepad->active_stream);
     } else {
+      GST_LOG_OBJECT (parsepad, "Creating unknown GstStream");
       stream =
           gst_stream_new (stream_id, NULL, GST_STREAM_TYPE_UNKNOWN,
           streamflags);
diff --git a/subprojects/gst-plugins-base/tools/gst-play.c b/subprojects/gst-plugins-base/tools/gst-play.c
index 8d0b697ede..1f9e89a43f 100644
--- a/subprojects/gst-plugins-base/tools/gst-play.c
+++ b/subprojects/gst-plugins-base/tools/gst-play.c
@@ -659,7 +659,7 @@ play_bus_msg (GstBus * bus, GstMessage * msg, gpointer user_data)
             } else if (type & GST_STREAM_TYPE_TEXT) {
               play->cur_text_sid = g_strdup (stream_id);
             } else {
-              gst_print ("Unknown stream type with stream-id %s", stream_id);
+              gst_print ("Unknown stream type with stream-id %s\n", stream_id);
             }
             gst_object_unref (stream);
           }