tests: add minmal matroskademux test for subtitle output

Some of the subtitle chunks will have embedded
NUL-terminators (last three), some don't (first three),
some will have markup, some won't, some will be valid
UTF-8 (all but last), some won't (last stanza).

https://bugzilla.gnome.org/show_bug.cgi?id=752421

tests/check/Makefile.am

@@ -193,6 +193,7 @@ endif
 
 if USE_PLUGIN_MATROSKA
 check_matroska = \
+	elements/matroskademux \
 	elements/matroskamux \
 	elements/matroskaparse
 else

tests/check/elements/.gitignore

@@ -37,6 +37,7 @@ interleave
 jpegdec
 jpegenc
 level
+matroskademux
 matroskamux
 matroskaparse
 mpegaudioparse

tests/check/elements/matroskademux.c

@@ -0,0 +1,124 @@
+/* GStreamer unit test for matroskademux
+ * Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <gst/check/gstcheck.h>
+#include <gst/check/gstharness.h>
+
+const gchar mkv_sub_base64[] =
+    "GkXfowEAAAAAAAAUQoKJbWF0cm9za2EAQoeBAkKFgQIYU4BnAQAAAAAAAg0RTZt0AQAAAAAAAIxN"
+    "uwEAAAAAAAASU6uEFUmpZlOsiAAAAAAAAACYTbsBAAAAAAAAElOrhBZUrmtTrIgAAAAAAAABEuya"
+    "AQAAAAAAABJTq4QQQ6dwU6yI///////////smgEAAAAAAAASU6uEHFO7a1OsiP//////////TbsB"
+    "AAAAAAAAElOrhBJUw2dTrIgAAAAAAAAB9xVJqWYBAAAAAAAAbnOkkDylQZJlrLziQo8+gsrZVtUq"
+    "17GDD0JARImIQNGUAAAAAABNgJ9HU3RyZWFtZXIgcGx1Z2luIHZlcnNpb24gMS40LjUAV0GZR1N0"
+    "cmVhbWVyIE1hdHJvc2thIG11eGVyAERhiAZfU0rcEwgAFlSuawEAAAAAAAA0rgEAAAAAAAAr14EB"
+    "g4ERc8WIoWF8pYlELidTbolTdWJ0aXRsZQCGjFNfVEVYVC9VVEY4AB9DtnUBAAAAAAAAmeeCA+ig"
+    "AQAAAAAAAA2bggfQoYeBAAAAZm9voAEAAAAAAAAUm4IH0KGOgQu4ADxpPmJhcjwvaT6gAQAAAAAA"
+    "AA2bggfQoYeBF3AAYmF6oAEAAAAAAAAOm4IH0KGIgScQAGbDtgCgAQAAAAAAABWbggfQoY+BMsgA"
+    "PGk+YmFyPC9pPgCgAQAAAAAAAA6bggfQoYiBPoAAYuR6ABJUw2cBAAAAAAAACnNzAQAAAAAAAAA=";
+
+static void
+pad_added_cb (GstElement * matroskademux, GstPad * pad, gpointer user_data)
+{
+  GstHarness *h = user_data;
+
+  GST_LOG_OBJECT (pad, "got new source pad");
+  gst_harness_add_element_src_pad (h, pad);
+}
+
+static void
+pull_and_check_buffer (GstHarness * h, GstClockTime pts, GstClockTime duration,
+    const gchar * output)
+{
+  GstMapInfo map;
+  GstBuffer *buf;
+
+  /* wait for buffer */
+  buf = gst_harness_pull (h);
+
+  /* Make sure there's no 0-terminator in there */
+  fail_unless (gst_buffer_map (buf, &map, GST_MAP_READ));
+  GST_MEMDUMP ("subtitle buffer", map.data, map.size);
+  fail_unless (map.size > 0);
+  fail_unless (map.data[map.size - 1] != '\0');
+  if (output != NULL && memcmp (map.data, output, map.size) != 0) {
+    g_printerr ("Got:\n");
+    gst_util_dump_mem (map.data, map.size);;
+    g_printerr ("Wanted:\n");
+    gst_util_dump_mem ((guint8 *) output, strlen (output));
+    g_error ("Did not get output expected.");
+  }
+
+  gst_buffer_unmap (buf, &map);
+
+  fail_unless_equals_int64 (pts, GST_BUFFER_PTS (buf));
+  fail_unless_equals_int64 (duration, GST_BUFFER_DURATION (buf));
+
+  gst_buffer_unref (buf);
+}
+
+GST_START_TEST (test_sub_terminator)
+{
+  GstHarness *h;
+  GstBuffer *buf;
+  guchar *mkv_data;
+  gsize mkv_size;
+
+  h = gst_harness_new_with_padnames ("matroskademux", "sink", NULL);
+
+  g_signal_connect (h->element, "pad-added", G_CALLBACK (pad_added_cb), h);
+
+  mkv_data = g_base64_decode (mkv_sub_base64, &mkv_size);
+  fail_unless (mkv_data != NULL);
+
+  gst_harness_set_src_caps_str (h, "video/x-matroska");
+
+  buf = gst_buffer_new_wrapped (mkv_data, mkv_size);
+  GST_BUFFER_OFFSET (buf) = 0;
+
+  fail_unless_equals_int (gst_harness_push (h, buf), GST_FLOW_OK);
+  gst_harness_push_event (h, gst_event_new_eos ());
+
+  pull_and_check_buffer (h, 1 * GST_SECOND, 2 * GST_SECOND, "foo");
+  pull_and_check_buffer (h, 4 * GST_SECOND, 2 * GST_SECOND, "<i>bar</i>");
+  pull_and_check_buffer (h, 7 * GST_SECOND, 2 * GST_SECOND, "baz");
+  pull_and_check_buffer (h, 11 * GST_SECOND, 2 * GST_SECOND, "f\303\266");
+  pull_and_check_buffer (h, 14 * GST_SECOND, 2 * GST_SECOND, "<i>bar</i>");
+  /* The input is invalid UTF-8 here, what happens might depend on locale */
+  pull_and_check_buffer (h, 17 * GST_SECOND, 2 * GST_SECOND, NULL);
+
+  fail_unless (gst_harness_try_pull (h) == NULL);
+
+  gst_harness_teardown (h);
+}
+
+GST_END_TEST;
+
+static Suite *
+matroskademux_suite (void)
+{
+  Suite *s = suite_create ("matroskademux");
+  TCase *tc_chain = tcase_create ("general");
+
+  suite_add_tcase (s, tc_chain);
+  tcase_add_test (tc_chain, test_sub_terminator);
+
+  return s;
+}
+
+GST_CHECK_MAIN (matroskademux);