tests/check/elements/audiorate.c - mtk-gst-plugins-base-debian - Git at Google

 /* GStreamer unit tests for audiorate
  *
  * Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
  *
  * 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.
  */

 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif

 #include <gst/check/gstcheck.h>
 #include <gst/audio/audio.h>

 /* helper element to insert additional buffers overlapping with previous ones */
 static gdouble injector_inject_probability = 0.0;

 typedef GstElement TestInjector;
 typedef GstElementClass TestInjectorClass;

 GType test_injector_get_type (void);
 G_DEFINE_TYPE (TestInjector, test_injector, GST_TYPE_ELEMENT);

 #define FORMATS "{ "GST_AUDIO_NE(F32)", S8, S16LE, S16BE, " \
                    "U16LE, U16NE, S32LE, S32BE, U32LE, U32BE }"

 #define INJECTOR_CAPS \
   "audio/x-raw, "                                        \
     "format = (string) "FORMATS", "                      \
     "rate = (int) [ 1, MAX ], "                          \
     "channels = (int) [ 1, 8 ]"

 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (INJECTOR_CAPS));

 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (INJECTOR_CAPS));

 static void
 test_injector_class_init (TestInjectorClass * klass)
 {
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

   gst_element_class_add_static_pad_template (element_class, &src_template);
   gst_element_class_add_static_pad_template (element_class, &sink_template);
 }

 static GstFlowReturn
 test_injector_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
 {
   GstFlowReturn ret;
   GstPad *srcpad;

   srcpad = gst_element_get_static_pad (GST_ELEMENT (parent), "src");

   /* since we're increasing timestamp/offsets, push this one first */
   GST_LOG (" passing buffer   [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
       "], offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
       GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
       GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
       GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));

   gst_buffer_ref (buf);

   ret = gst_pad_push (srcpad, buf);

   if (g_random_double () < injector_inject_probability) {
     GstBuffer *ibuf;

     ibuf = gst_buffer_copy (buf);

     if (GST_BUFFER_OFFSET_IS_VALID (buf) &&
         GST_BUFFER_OFFSET_END_IS_VALID (buf)) {
       guint64 delta;

       delta = GST_BUFFER_OFFSET_END (buf) - GST_BUFFER_OFFSET (buf);
       GST_BUFFER_OFFSET (ibuf) += delta / 4;
       GST_BUFFER_OFFSET_END (ibuf) += delta / 4;
     } else {
       GST_BUFFER_OFFSET (ibuf) = GST_BUFFER_OFFSET_NONE;
       GST_BUFFER_OFFSET_END (ibuf) = GST_BUFFER_OFFSET_NONE;
     }

     if (GST_BUFFER_TIMESTAMP_IS_VALID (buf) &&
         GST_BUFFER_DURATION_IS_VALID (buf)) {
       GstClockTime delta;

       delta = GST_BUFFER_DURATION (buf);
       GST_BUFFER_TIMESTAMP (ibuf) += delta / 4;
     } else {
       GST_BUFFER_TIMESTAMP (ibuf) = GST_CLOCK_TIME_NONE;
       GST_BUFFER_DURATION (ibuf) = GST_CLOCK_TIME_NONE;
     }

     if (GST_BUFFER_TIMESTAMP_IS_VALID (ibuf) ||
         GST_BUFFER_OFFSET_IS_VALID (ibuf)) {
       GST_LOG ("injecting buffer [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
           "], offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
           GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (ibuf)),
           GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (ibuf) +
               GST_BUFFER_DURATION (ibuf)), GST_BUFFER_OFFSET (ibuf),
           GST_BUFFER_OFFSET_END (ibuf));

       if (gst_pad_push (srcpad, ibuf) != GST_FLOW_OK) {
         /* ignore return value */
       }
     } else {
       GST_WARNING ("couldn't inject buffer, no incoming timestamps or offsets");
       gst_buffer_unref (ibuf);
     }
   }

   gst_buffer_unref (buf);
   gst_object_unref (srcpad);

   return ret;
 }

 static void
 test_injector_init (TestInjector * injector)
 {
   GstPad *pad;

   pad = gst_pad_new_from_static_template (&sink_template, "sink");
   gst_pad_set_chain_function (pad, test_injector_chain);
   GST_PAD_SET_PROXY_CAPS (pad);
   gst_element_add_pad (GST_ELEMENT (injector), pad);

   pad = gst_pad_new_from_static_template (&src_template, "src");
   GST_PAD_SET_PROXY_CAPS (pad);
   gst_element_add_pad (GST_ELEMENT (injector), pad);
 }

 static GstPadProbeReturn
 probe_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
 {
   GstBuffer *buf = GST_PAD_PROBE_INFO_BUFFER (info);
   gdouble *drop_probability = user_data;

   if (g_random_double () < *drop_probability) {
     GST_LOG ("dropping buffer [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT "], "
         "offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
         GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
         GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
         GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));
     return GST_PAD_PROBE_DROP;  /* drop buffer */
   }

   return GST_PAD_PROBE_OK;      /* don't drop buffer */
 }

 static void
 got_buf (GstElement * fakesink, GstBuffer * buf, GstPad * pad, GList ** p_bufs)
 {
   *p_bufs = g_list_append (*p_bufs, gst_buffer_ref (buf));
 }

 static void
 do_perfect_stream_test (guint rate, const gchar * format,
     gdouble drop_probability, gdouble inject_probability)
 {
   GstElement *pipe, *src, *conv, *filter, *injector, *audiorate, *sink;
   GstMessage *msg;
   GstCaps *caps;
   GstPad *srcpad;
   GList *l, *bufs = NULL;
   GstClockTime next_time = GST_CLOCK_TIME_NONE;
   guint64 next_offset = GST_BUFFER_OFFSET_NONE;
   GstAudioFormat fmt;
   const GstAudioFormatInfo *finfo;
   gint width;

   fmt = gst_audio_format_from_string (format);
   g_assert (format != GST_AUDIO_FORMAT_UNKNOWN);

   finfo = gst_audio_format_get_info (fmt);
   width = GST_AUDIO_FORMAT_INFO_WIDTH (finfo);

   caps = gst_caps_new_simple ("audio/x-raw", "rate", G_TYPE_INT,
       rate, "format", G_TYPE_STRING, format, NULL);

   GST_INFO ("-------- drop=%.0f%% caps = %" GST_PTR_FORMAT " ---------- ",
       drop_probability * 100.0, caps);

   g_assert (drop_probability >= 0.0 && drop_probability <= 1.0);
   g_assert (inject_probability >= 0.0 && inject_probability <= 1.0);

   pipe = gst_pipeline_new ("pipeline");
   fail_unless (pipe != NULL);

   src = gst_element_factory_make ("audiotestsrc", "audiotestsrc");
   fail_unless (src != NULL);

   g_object_set (src, "num-buffers", 10, NULL);

   conv = gst_element_factory_make ("audioconvert", "audioconvert");
   fail_unless (conv != NULL);

   filter = gst_element_factory_make ("capsfilter", "capsfilter");
   fail_unless (filter != NULL);

   g_object_set (filter, "caps", caps, NULL);

   injector_inject_probability = inject_probability;

   injector = GST_ELEMENT (g_object_new (test_injector_get_type (), NULL));

   srcpad = gst_element_get_static_pad (injector, "src");
   fail_unless (srcpad != NULL);
   gst_pad_add_probe (srcpad, GST_PAD_PROBE_TYPE_BUFFER, probe_cb,
       &drop_probability, NULL);
   gst_object_unref (srcpad);

   audiorate = gst_element_factory_make ("audiorate", "audiorate");
   fail_unless (audiorate != NULL);

   sink = gst_element_factory_make ("fakesink", "fakesink");
   fail_unless (sink != NULL);

   g_object_set (sink, "signal-handoffs", TRUE, NULL);

   g_signal_connect (sink, "handoff", G_CALLBACK (got_buf), &bufs);

   gst_bin_add_many (GST_BIN (pipe), src, conv, filter, injector, audiorate,
       sink, NULL);
   gst_element_link_many (src, conv, filter, injector, audiorate, sink, NULL);

   fail_unless_equals_int (gst_element_set_state (pipe, GST_STATE_PLAYING),
       GST_STATE_CHANGE_ASYNC);

   fail_unless_equals_int (gst_element_get_state (pipe, NULL, NULL, -1),
       GST_STATE_CHANGE_SUCCESS);

   msg = gst_bus_poll (GST_ELEMENT_BUS (pipe),
       GST_MESSAGE_EOS | GST_MESSAGE_ERROR, -1);
   fail_unless_equals_string (GST_MESSAGE_TYPE_NAME (msg), "eos");

   for (l = bufs; l != NULL; l = l->next) {
     GstBuffer *buf = GST_BUFFER (l->data);
     guint num_samples;

     fail_unless (GST_BUFFER_TIMESTAMP_IS_VALID (buf));
     fail_unless (GST_BUFFER_DURATION_IS_VALID (buf));
     fail_unless (GST_BUFFER_OFFSET_IS_VALID (buf));
     fail_unless (GST_BUFFER_OFFSET_END_IS_VALID (buf));

     GST_LOG ("buffer: ts=%" GST_TIME_FORMAT ", end_ts=%" GST_TIME_FORMAT
         " off=%" G_GINT64_FORMAT ", end_off=%" G_GINT64_FORMAT,
         GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
         GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
         GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));

     if (GST_CLOCK_TIME_IS_VALID (next_time)) {
       fail_unless_equals_uint64 (next_time, GST_BUFFER_TIMESTAMP (buf));
     }
     if (next_offset != GST_BUFFER_OFFSET_NONE) {
       fail_unless_equals_uint64 (next_offset, GST_BUFFER_OFFSET (buf));
     }

     /* check buffer size for sanity */
     fail_unless_equals_int (gst_buffer_get_size (buf) % (width / 8), 0);

     /* check there is actually as much data as there should be */
     num_samples = GST_BUFFER_OFFSET_END (buf) - GST_BUFFER_OFFSET (buf);
     fail_unless_equals_int (gst_buffer_get_size (buf),
         num_samples * (width / 8));

     next_time = GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf);
     next_offset = GST_BUFFER_OFFSET_END (buf);
   }

   gst_message_unref (msg);
   gst_element_set_state (pipe, GST_STATE_NULL);
   gst_object_unref (pipe);

   g_list_foreach (bufs, (GFunc) gst_mini_object_unref, NULL);
   g_list_free (bufs);

   gst_caps_unref (caps);
 }

 static const guint rates[] = { 8000, 11025, 16000, 22050, 32000, 44100,
   48000, 3333, 33333, 66666, 9999
 };

 GST_START_TEST (test_perfect_stream_drop0)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.0, 0.0);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.0);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_drop10)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.10, 0.0);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.10, 0.0);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_drop50)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.50, 0.0);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.50, 0.0);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_drop90)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.90, 0.0);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.90, 0.0);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_inject10)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.0, 0.10);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.10);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_inject90)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.0, 0.90);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.90);
   }
 }

 GST_END_TEST;

 GST_START_TEST (test_perfect_stream_drop45_inject25)
 {
   guint i;

   for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
     do_perfect_stream_test (rates[i], "S8", 0.45, 0.25);
     do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.45, 0.25);
   }
 }

 GST_END_TEST;

 /* TODO: also do all tests with channels=1 and channels=2 */

 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-raw,format=" GST_AUDIO_NE (F32)
         ",channels=1,rate=44100")
     );

 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-raw,format=" GST_AUDIO_NE (F32)
         ",channels=1,rate=44100")
     );

 GST_START_TEST (test_large_discont)
 {
   GstElement *audiorate;
   GstCaps *caps;
   GstPad *srcpad, *sinkpad;
   GstBuffer *buf;

   audiorate = gst_check_setup_element ("audiorate");
   caps = gst_caps_new_simple ("audio/x-raw",
       "format", G_TYPE_STRING, GST_AUDIO_NE (F32),
       "layout", G_TYPE_STRING, "interleaved",
       "channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 44100, NULL);

   srcpad = gst_check_setup_src_pad (audiorate, &srctemplate);
   sinkpad = gst_check_setup_sink_pad (audiorate, &sinktemplate);

   gst_pad_set_active (srcpad, TRUE);

   gst_check_setup_events (srcpad, audiorate, caps, GST_FORMAT_TIME);

   gst_pad_set_active (sinkpad, TRUE);

   fail_unless (gst_element_set_state (audiorate,
           GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS,
       "failed to set audiorate playing");

   buf = gst_buffer_new_and_alloc (4);
   GST_BUFFER_TIMESTAMP (buf) = 0;
   gst_pad_push (srcpad, buf);

   fail_unless_equals_int (g_list_length (buffers), 1);

   buf = gst_buffer_new_and_alloc (4);
   GST_BUFFER_TIMESTAMP (buf) = 2 * GST_SECOND;
   gst_pad_push (srcpad, buf);
   /* Now we should have 3 more buffers: the one we injected, plus _two_ filler
    * buffers, because the gap is > 1 second (but less than 2 seconds) */
   fail_unless_equals_int (g_list_length (buffers), 4);

   gst_element_set_state (audiorate, GST_STATE_NULL);
   gst_caps_unref (caps);

   gst_check_drop_buffers ();
   gst_check_teardown_sink_pad (audiorate);
   gst_check_teardown_src_pad (audiorate);

   gst_object_unref (audiorate);
 }

 GST_END_TEST;

 static Suite *
 audiorate_suite (void)
 {
   Suite *s = suite_create ("audiorate");
   TCase *tc_chain = tcase_create ("general");

   suite_add_tcase (s, tc_chain);

   tcase_add_test (tc_chain, test_perfect_stream_drop0);
   tcase_add_test (tc_chain, test_perfect_stream_drop10);
   tcase_add_test (tc_chain, test_perfect_stream_drop50);
   tcase_add_test (tc_chain, test_perfect_stream_drop90);
   tcase_add_test (tc_chain, test_perfect_stream_inject10);
   tcase_add_test (tc_chain, test_perfect_stream_inject90);
   tcase_add_test (tc_chain, test_perfect_stream_drop45_inject25);
   tcase_add_test (tc_chain, test_large_discont);

   return s;
 }

 GST_CHECK_MAIN (audiorate);
	/* GStreamer unit tests for audiorate
	*
	* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
	*
	* 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.
	*/

	#ifdef HAVE_CONFIG_H
	# include <config.h>
	#endif

	#include <gst/check/gstcheck.h>
	#include <gst/audio/audio.h>

	/* helper element to insert additional buffers overlapping with previous ones */
	static gdouble injector_inject_probability = 0.0;

	typedef GstElement TestInjector;
	typedef GstElementClass TestInjectorClass;

	GType test_injector_get_type (void);
	G_DEFINE_TYPE (TestInjector, test_injector, GST_TYPE_ELEMENT);

	#define FORMATS "{ "GST_AUDIO_NE(F32)", S8, S16LE, S16BE, " \
	"U16LE, U16NE, S32LE, S32BE, U32LE, U32BE }"

	#define INJECTOR_CAPS \
	"audio/x-raw, " \
	"format = (string) "FORMATS", " \
	"rate = (int) [ 1, MAX ], " \
	"channels = (int) [ 1, 8 ]"

	static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (INJECTOR_CAPS));

	static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (INJECTOR_CAPS));

	static void
	test_injector_class_init (TestInjectorClass * klass)
	{
	GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

	gst_element_class_add_static_pad_template (element_class, &src_template);
	gst_element_class_add_static_pad_template (element_class, &sink_template);
	}

	static GstFlowReturn
	test_injector_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
	{
	GstFlowReturn ret;
	GstPad *srcpad;

	srcpad = gst_element_get_static_pad (GST_ELEMENT (parent), "src");

	/* since we're increasing timestamp/offsets, push this one first */
	GST_LOG (" passing buffer [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
	"], offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
	GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));

	gst_buffer_ref (buf);

	ret = gst_pad_push (srcpad, buf);

	if (g_random_double () < injector_inject_probability) {
	GstBuffer *ibuf;

	ibuf = gst_buffer_copy (buf);

	if (GST_BUFFER_OFFSET_IS_VALID (buf) &&
	GST_BUFFER_OFFSET_END_IS_VALID (buf)) {
	guint64 delta;

	delta = GST_BUFFER_OFFSET_END (buf) - GST_BUFFER_OFFSET (buf);
	GST_BUFFER_OFFSET (ibuf) += delta / 4;
	GST_BUFFER_OFFSET_END (ibuf) += delta / 4;
	} else {
	GST_BUFFER_OFFSET (ibuf) = GST_BUFFER_OFFSET_NONE;
	GST_BUFFER_OFFSET_END (ibuf) = GST_BUFFER_OFFSET_NONE;
	}

	if (GST_BUFFER_TIMESTAMP_IS_VALID (buf) &&
	GST_BUFFER_DURATION_IS_VALID (buf)) {
	GstClockTime delta;

	delta = GST_BUFFER_DURATION (buf);
	GST_BUFFER_TIMESTAMP (ibuf) += delta / 4;
	} else {
	GST_BUFFER_TIMESTAMP (ibuf) = GST_CLOCK_TIME_NONE;
	GST_BUFFER_DURATION (ibuf) = GST_CLOCK_TIME_NONE;
	}

	if (GST_BUFFER_TIMESTAMP_IS_VALID (ibuf) \|\|
	GST_BUFFER_OFFSET_IS_VALID (ibuf)) {
	GST_LOG ("injecting buffer [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT
	"], offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (ibuf)),
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (ibuf) +
	GST_BUFFER_DURATION (ibuf)), GST_BUFFER_OFFSET (ibuf),
	GST_BUFFER_OFFSET_END (ibuf));

	if (gst_pad_push (srcpad, ibuf) != GST_FLOW_OK) {
	/* ignore return value */
	}
	} else {
	GST_WARNING ("couldn't inject buffer, no incoming timestamps or offsets");
	gst_buffer_unref (ibuf);
	}
	}

	gst_buffer_unref (buf);
	gst_object_unref (srcpad);

	return ret;
	}

	static void
	test_injector_init (TestInjector * injector)
	{
	GstPad *pad;

	pad = gst_pad_new_from_static_template (&sink_template, "sink");
	gst_pad_set_chain_function (pad, test_injector_chain);
	GST_PAD_SET_PROXY_CAPS (pad);
	gst_element_add_pad (GST_ELEMENT (injector), pad);

	pad = gst_pad_new_from_static_template (&src_template, "src");
	GST_PAD_SET_PROXY_CAPS (pad);
	gst_element_add_pad (GST_ELEMENT (injector), pad);
	}

	static GstPadProbeReturn
	probe_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
	{
	GstBuffer *buf = GST_PAD_PROBE_INFO_BUFFER (info);
	gdouble *drop_probability = user_data;

	if (g_random_double () < *drop_probability) {
	GST_LOG ("dropping buffer [t=%" GST_TIME_FORMAT "-%" GST_TIME_FORMAT "], "
	"offset=%" G_GINT64_FORMAT ", offset_end=%" G_GINT64_FORMAT,
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
	GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));
	return GST_PAD_PROBE_DROP; /* drop buffer */
	}

	return GST_PAD_PROBE_OK; /* don't drop buffer */
	}

	static void
	got_buf (GstElement * fakesink, GstBuffer * buf, GstPad * pad, GList ** p_bufs)
	{
	p_bufs = g_list_append (p_bufs, gst_buffer_ref (buf));
	}

	static void
	do_perfect_stream_test (guint rate, const gchar * format,
	gdouble drop_probability, gdouble inject_probability)
	{
	GstElement pipe, src, conv, filter, injector, audiorate, *sink;
	GstMessage *msg;
	GstCaps *caps;
	GstPad *srcpad;
	GList l, bufs = NULL;
	GstClockTime next_time = GST_CLOCK_TIME_NONE;
	guint64 next_offset = GST_BUFFER_OFFSET_NONE;
	GstAudioFormat fmt;
	const GstAudioFormatInfo *finfo;
	gint width;

	fmt = gst_audio_format_from_string (format);
	g_assert (format != GST_AUDIO_FORMAT_UNKNOWN);

	finfo = gst_audio_format_get_info (fmt);
	width = GST_AUDIO_FORMAT_INFO_WIDTH (finfo);

	caps = gst_caps_new_simple ("audio/x-raw", "rate", G_TYPE_INT,
	rate, "format", G_TYPE_STRING, format, NULL);

	GST_INFO ("-------- drop=%.0f%% caps = %" GST_PTR_FORMAT " ---------- ",
	drop_probability * 100.0, caps);

	g_assert (drop_probability >= 0.0 && drop_probability <= 1.0);
	g_assert (inject_probability >= 0.0 && inject_probability <= 1.0);

	pipe = gst_pipeline_new ("pipeline");
	fail_unless (pipe != NULL);

	src = gst_element_factory_make ("audiotestsrc", "audiotestsrc");
	fail_unless (src != NULL);

	g_object_set (src, "num-buffers", 10, NULL);

	conv = gst_element_factory_make ("audioconvert", "audioconvert");
	fail_unless (conv != NULL);

	filter = gst_element_factory_make ("capsfilter", "capsfilter");
	fail_unless (filter != NULL);

	g_object_set (filter, "caps", caps, NULL);

	injector_inject_probability = inject_probability;

	injector = GST_ELEMENT (g_object_new (test_injector_get_type (), NULL));

	srcpad = gst_element_get_static_pad (injector, "src");
	fail_unless (srcpad != NULL);
	gst_pad_add_probe (srcpad, GST_PAD_PROBE_TYPE_BUFFER, probe_cb,
	&drop_probability, NULL);
	gst_object_unref (srcpad);

	audiorate = gst_element_factory_make ("audiorate", "audiorate");
	fail_unless (audiorate != NULL);

	sink = gst_element_factory_make ("fakesink", "fakesink");
	fail_unless (sink != NULL);

	g_object_set (sink, "signal-handoffs", TRUE, NULL);

	g_signal_connect (sink, "handoff", G_CALLBACK (got_buf), &bufs);

	gst_bin_add_many (GST_BIN (pipe), src, conv, filter, injector, audiorate,
	sink, NULL);
	gst_element_link_many (src, conv, filter, injector, audiorate, sink, NULL);

	fail_unless_equals_int (gst_element_set_state (pipe, GST_STATE_PLAYING),
	GST_STATE_CHANGE_ASYNC);

	fail_unless_equals_int (gst_element_get_state (pipe, NULL, NULL, -1),
	GST_STATE_CHANGE_SUCCESS);

	msg = gst_bus_poll (GST_ELEMENT_BUS (pipe),
	GST_MESSAGE_EOS \| GST_MESSAGE_ERROR, -1);
	fail_unless_equals_string (GST_MESSAGE_TYPE_NAME (msg), "eos");

	for (l = bufs; l != NULL; l = l->next) {
	GstBuffer *buf = GST_BUFFER (l->data);
	guint num_samples;

	fail_unless (GST_BUFFER_TIMESTAMP_IS_VALID (buf));
	fail_unless (GST_BUFFER_DURATION_IS_VALID (buf));
	fail_unless (GST_BUFFER_OFFSET_IS_VALID (buf));
	fail_unless (GST_BUFFER_OFFSET_END_IS_VALID (buf));

	GST_LOG ("buffer: ts=%" GST_TIME_FORMAT ", end_ts=%" GST_TIME_FORMAT
	" off=%" G_GINT64_FORMAT ", end_off=%" G_GINT64_FORMAT,
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
	GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf)),
	GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET_END (buf));

	if (GST_CLOCK_TIME_IS_VALID (next_time)) {
	fail_unless_equals_uint64 (next_time, GST_BUFFER_TIMESTAMP (buf));
	}
	if (next_offset != GST_BUFFER_OFFSET_NONE) {
	fail_unless_equals_uint64 (next_offset, GST_BUFFER_OFFSET (buf));
	}

	/* check buffer size for sanity */
	fail_unless_equals_int (gst_buffer_get_size (buf) % (width / 8), 0);

	/* check there is actually as much data as there should be */
	num_samples = GST_BUFFER_OFFSET_END (buf) - GST_BUFFER_OFFSET (buf);
	fail_unless_equals_int (gst_buffer_get_size (buf),
	num_samples * (width / 8));

	next_time = GST_BUFFER_TIMESTAMP (buf) + GST_BUFFER_DURATION (buf);
	next_offset = GST_BUFFER_OFFSET_END (buf);
	}

	gst_message_unref (msg);
	gst_element_set_state (pipe, GST_STATE_NULL);
	gst_object_unref (pipe);

	g_list_foreach (bufs, (GFunc) gst_mini_object_unref, NULL);
	g_list_free (bufs);

	gst_caps_unref (caps);
	}

	static const guint rates[] = { 8000, 11025, 16000, 22050, 32000, 44100,
	48000, 3333, 33333, 66666, 9999
	};

	GST_START_TEST (test_perfect_stream_drop0)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.0, 0.0);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.0);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_drop10)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.10, 0.0);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.10, 0.0);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_drop50)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.50, 0.0);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.50, 0.0);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_drop90)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.90, 0.0);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.90, 0.0);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_inject10)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.0, 0.10);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.10);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_inject90)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.0, 0.90);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.0, 0.90);
	}
	}

	GST_END_TEST;

	GST_START_TEST (test_perfect_stream_drop45_inject25)
	{
	guint i;

	for (i = 0; i < G_N_ELEMENTS (rates); ++i) {
	do_perfect_stream_test (rates[i], "S8", 0.45, 0.25);
	do_perfect_stream_test (rates[i], GST_AUDIO_NE (S16), 0.45, 0.25);
	}
	}

	GST_END_TEST;

	/* TODO: also do all tests with channels=1 and channels=2 */

	static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("audio/x-raw,format=" GST_AUDIO_NE (F32)
	",channels=1,rate=44100")
	);

	static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("audio/x-raw,format=" GST_AUDIO_NE (F32)
	",channels=1,rate=44100")
	);

	GST_START_TEST (test_large_discont)
	{
	GstElement *audiorate;
	GstCaps *caps;
	GstPad srcpad, sinkpad;
	GstBuffer *buf;

	audiorate = gst_check_setup_element ("audiorate");
	caps = gst_caps_new_simple ("audio/x-raw",
	"format", G_TYPE_STRING, GST_AUDIO_NE (F32),
	"layout", G_TYPE_STRING, "interleaved",
	"channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 44100, NULL);

	srcpad = gst_check_setup_src_pad (audiorate, &srctemplate);
	sinkpad = gst_check_setup_sink_pad (audiorate, &sinktemplate);

	gst_pad_set_active (srcpad, TRUE);

	gst_check_setup_events (srcpad, audiorate, caps, GST_FORMAT_TIME);

	gst_pad_set_active (sinkpad, TRUE);

	fail_unless (gst_element_set_state (audiorate,
	GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS,
	"failed to set audiorate playing");

	buf = gst_buffer_new_and_alloc (4);
	GST_BUFFER_TIMESTAMP (buf) = 0;
	gst_pad_push (srcpad, buf);

	fail_unless_equals_int (g_list_length (buffers), 1);

	buf = gst_buffer_new_and_alloc (4);
	GST_BUFFER_TIMESTAMP (buf) = 2 * GST_SECOND;
	gst_pad_push (srcpad, buf);
	/* Now we should have 3 more buffers: the one we injected, plus _two_ filler
	* buffers, because the gap is > 1 second (but less than 2 seconds) */
	fail_unless_equals_int (g_list_length (buffers), 4);

	gst_element_set_state (audiorate, GST_STATE_NULL);
	gst_caps_unref (caps);

	gst_check_drop_buffers ();
	gst_check_teardown_sink_pad (audiorate);
	gst_check_teardown_src_pad (audiorate);

	gst_object_unref (audiorate);
	}

	GST_END_TEST;

	static Suite *
	audiorate_suite (void)
	{
	Suite *s = suite_create ("audiorate");
	TCase *tc_chain = tcase_create ("general");

	suite_add_tcase (s, tc_chain);

	tcase_add_test (tc_chain, test_perfect_stream_drop0);
	tcase_add_test (tc_chain, test_perfect_stream_drop10);
	tcase_add_test (tc_chain, test_perfect_stream_drop50);
	tcase_add_test (tc_chain, test_perfect_stream_drop90);
	tcase_add_test (tc_chain, test_perfect_stream_inject10);
	tcase_add_test (tc_chain, test_perfect_stream_inject90);
	tcase_add_test (tc_chain, test_perfect_stream_drop45_inject25);
	tcase_add_test (tc_chain, test_large_discont);

	return s;
	}

	GST_CHECK_MAIN (audiorate);