discoverer: Enhance printed information when not verbose

Basically print information about media tracks making without tags
nor buffers in caps making still quite small but containing all
information infos.

Stop making 'Topology' section and just print the info

before:

```
Topology:
  container: MPEG-2 Transport Stream
    audio: AC-3 (ATSC A/52)
    video: H.264 (High Profile)

Properties:
  Duration: 0:00:05.512394259
  Seekable: yes
  Live: no
  Tags:
      audio codec: AC-3 (ATSC A/52)
      bitrate: 192000
      video codec: H.264 (High Profile)
      minimum bitrate: 12947
      maximum bitrate: 12947
```

After:

```
Properties:
  Duration: 0:00:05.512394259
  Seekable: yes
  Live: no
  container: MPEG-2 Transport Stream
    audio: AC-3 (ATSC A/52)
      Stream ID: b076403d73e0c5fc13985832e8d585945603993437ba14b0799f422f9495e8ef:1/00001100
      Language: <unknown>
      Channels: 2 (front-left, front-right)
      Sample rate: 48000
      Depth: 32
      Bitrate: 192000
      Max bitrate: 0
    video: H.264 (High Profile)
      Stream ID: b076403d73e0c5fc13985832e8d585945603993437ba14b0799f422f9495e8ef:1/00001011
      Width: 1920
      Height: 1080
      Depth: 24
      Frame rate: 30000/1001
      Pixel aspect ratio: 1/1
      Interlaced: true
      Bitrate: 10363396
      Max bitrate: 12947
```

1 files changed, 95 insertions, 45 deletions

diff --git a/tools/gst-discoverer.c b/tools/gst-discoverer.c
index c063c49e5..24de51fef 100644
--- a/tools/gst-discoverer.c
+++ b/tools/gst-discoverer.c
@@ -46,6 +46,37 @@ typedef struct
   char **argv;
 } PrivStruct;
 
+static gboolean
+structure_remove_buffers_ip (GQuark field_id, GValue * value,
+    gpointer user_data)
+{
+  if (G_VALUE_HOLDS (value, GST_TYPE_BUFFER))
+    return FALSE;
+
+  if (GST_VALUE_HOLDS_ARRAY (value)) {
+    gint i;
+
+    for (i = 0; i < gst_value_array_get_size (value); i++) {
+      if (structure_remove_buffers_ip (0,
+              (GValue *) gst_value_array_get_value (value, i), user_data))
+        return TRUE;
+    }
+
+    return FALSE;
+  }
+  return TRUE;
+}
+
+static gboolean
+caps_remove_buffers_ip (GstCapsFeatures * features, GstStructure * structure,
+    gpointer user_data)
+{
+  gst_structure_filter_and_map_in_place (structure,
+      structure_remove_buffers_ip, NULL);
+
+  return TRUE;
+}
+
 static void
 my_g_string_append_printf (GString * str, int depth, const gchar * format, ...)
 {
@@ -60,6 +91,26 @@ my_g_string_append_printf (GString * str, int depth, const gchar * format, ...)
   va_end (args);
 }
 
+static gchar *
+caps_to_string (GstCaps * caps)
+{
+  gchar *res = NULL;
+
+  if (verbose) {
+    res = gst_caps_to_string (caps);
+    goto done;
+  }
+
+  caps = gst_caps_make_writable (caps);
+
+  gst_caps_map_in_place (caps, caps_remove_buffers_ip, NULL);
+  res = gst_caps_to_string (caps);
+
+done:
+  gst_caps_unref (caps);
+  return res;
+}
+
 static void
 gst_stream_information_to_string (GstDiscovererStreamInfo * info, GString * s,
     guint depth)
@@ -70,21 +121,22 @@ gst_stream_information_to_string (GstDiscovererStreamInfo * info, GString * s,
   const GstStructure *misc;
 #endif
 
-  my_g_string_append_printf (s, depth, "Codec:\n");
-  caps = gst_discoverer_stream_info_get_caps (info);
-  tmp = gst_caps_to_string (caps);
-  gst_caps_unref (caps);
-  my_g_string_append_printf (s, depth, "  %s\n", tmp);
-  g_free (tmp);
-
-#ifndef GST_DISABLE_DEPRECATED
-  my_g_string_append_printf (s, depth, "Additional info:\n");
-  if ((misc = gst_discoverer_stream_info_get_misc (info))) {
-    tmp = gst_structure_to_string (misc);
+  if (verbose) {
+    my_g_string_append_printf (s, depth, "Codec:\n");
+    caps = gst_discoverer_stream_info_get_caps (info);
+    tmp = caps_to_string (caps);
     my_g_string_append_printf (s, depth, "  %s\n", tmp);
     g_free (tmp);
-  } else {
-    my_g_string_append_printf (s, depth, "  None\n");
+  }
+#ifndef GST_DISABLE_DEPRECATED
+  if (verbose) {
+    misc = gst_discoverer_stream_info_get_misc (info);
+    if (misc) {
+      my_g_string_append_printf (s, depth, "Additional info:\n");
+      tmp = gst_structure_to_string (misc);
+      my_g_string_append_printf (s, depth, "  %s\n", tmp);
+      g_free (tmp);
+    }
   }
 #endif
 
@@ -114,7 +166,7 @@ print_tag_foreach (const GstTagList * tags, const gchar * tag,
       if (caps) {
         gchar *caps_str;
 
-        caps_str = gst_caps_to_string (caps);
+        caps_str = caps_to_string (gst_caps_ref (caps));
         str = g_strdup_printf ("buffer of %" G_GSIZE_FORMAT " bytes, "
             "type: %s", gst_buffer_get_size (img), caps_str);
         g_free (caps_str);
@@ -138,6 +190,9 @@ print_tag_foreach (const GstTagList * tags, const gchar * tag,
 static void
 print_tags_topology (guint depth, const GstTagList * tags)
 {
+  if (!verbose)
+    return;
+
   g_print ("%*sTags:\n", 2 * depth, " ");
   if (tags) {
     gst_tag_list_foreach (tags, print_tag_foreach,
@@ -145,8 +200,7 @@ print_tags_topology (guint depth, const GstTagList * tags)
   } else {
     g_print ("%*sNone\n", 2 * (depth + 1), " ");
   }
-  if (verbose)
-    g_print ("%*s\n", 2 * depth, " ");
+  g_print ("%*s\n", 2 * depth, " ");
 }
 
 static gchar *
@@ -309,7 +363,7 @@ print_stream_info (GstDiscovererStreamInfo * info, void *depth)
     if (gst_caps_is_fixed (caps) && !verbose)
       desc = gst_pb_utils_get_codec_description (caps);
     else
-      desc = gst_caps_to_string (caps);
+      desc = caps_to_string (gst_caps_ref (caps));
     gst_caps_unref (caps);
   }
 
@@ -322,23 +376,21 @@ print_stream_info (GstDiscovererStreamInfo * info, void *depth)
     desc = NULL;
   }
 
-  if (verbose) {
-    if (GST_IS_DISCOVERER_AUDIO_INFO (info))
-      desc =
-          gst_stream_audio_information_to_string (info,
-          GPOINTER_TO_INT (depth) + 1);
-    else if (GST_IS_DISCOVERER_VIDEO_INFO (info))
-      desc =
-          gst_stream_video_information_to_string (info,
-          GPOINTER_TO_INT (depth) + 1);
-    else if (GST_IS_DISCOVERER_SUBTITLE_INFO (info))
-      desc =
-          gst_stream_subtitle_information_to_string (info,
-          GPOINTER_TO_INT (depth) + 1);
-    if (desc) {
-      g_print ("%s", desc);
-      g_free (desc);
-    }
+  if (GST_IS_DISCOVERER_AUDIO_INFO (info))
+    desc =
+        gst_stream_audio_information_to_string (info,
+        GPOINTER_TO_INT (depth) + 1);
+  else if (GST_IS_DISCOVERER_VIDEO_INFO (info))
+    desc =
+        gst_stream_video_information_to_string (info,
+        GPOINTER_TO_INT (depth) + 1);
+  else if (GST_IS_DISCOVERER_SUBTITLE_INFO (info))
+    desc =
+        gst_stream_subtitle_information_to_string (info,
+        GPOINTER_TO_INT (depth) + 1);
+  if (desc) {
+    g_print ("%s", desc);
+    g_free (desc);
   }
 }
 
@@ -411,7 +463,7 @@ print_properties (GstDiscovererInfo * info, gint tab)
       (gst_discoverer_info_get_seekable (info) ? "yes" : "no"));
   g_print ("%*sLive: %s\n", tab + 1, " ",
       (gst_discoverer_info_get_live (info) ? "yes" : "no"));
-  if ((tags = gst_discoverer_info_get_tags (info))) {
+  if (verbose && (tags = gst_discoverer_info_get_tags (info))) {
     g_print ("%*sTags: \n", tab + 1, " ");
     gst_tag_list_foreach (tags, print_tag_foreach, GUINT_TO_POINTER (tab + 2));
   }
@@ -466,27 +518,25 @@ print_info (GstDiscovererInfo * info, GError * err)
     }
     case GST_DISCOVERER_MISSING_PLUGINS:
     {
+      gint i = 0;
+      const gchar **installer_details =
+          gst_discoverer_info_get_missing_elements_installer_details (info);
+
       g_print ("Missing plugins\n");
-      if (verbose) {
-        gint i = 0;
-        const gchar **installer_details =
-            gst_discoverer_info_get_missing_elements_installer_details (info);
 
-        while (installer_details[i]) {
-          g_print (" (%s)\n", installer_details[i]);
+      while (installer_details[i]) {
+        g_print (" (%s)\n", installer_details[i]);
 
-          i++;
-        }
+        i++;
       }
       break;
     }
   }
 
   if ((sinfo = gst_discoverer_info_get_stream_info (info))) {
-    g_print ("\nTopology:\n");
-    print_topology (sinfo, 1);
     g_print ("\nProperties:\n");
     print_properties (info, 1);
+    print_topology (sinfo, 1);
     gst_discoverer_stream_info_unref (sinfo);
   }