diff -r 000000000000 -r 0e761a78d257 gst_plugins_base/tests/check/elements/audioconvert.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/tests/check/elements/audioconvert.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,884 @@
+/* GStreamer
+ *
+ * unit test for audioconvert
+ *
+ * Copyright (C) <2005> Thomas Vander Stichele <thomas at apestaart dot org>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <unistd.h>
+
+#include <gst/floatcast/floatcast.h>
+#include <gst/check/gstcheck.h>
+#include <gst/audio/multichannel.h>
+
+/* For ease of programming we use globals to keep refs for our floating
+ * src and sink pads we create; otherwise we always have to do get_pad,
+ * get_peer, and then remove references in every test function */
+static GstPad *mysrcpad, *mysinkpad;
+
+#define CONVERT_CAPS_TEMPLATE_STRING    \
+  "audio/x-raw-float, " \
+    "rate = (int) [ 1, MAX ], " \
+    "channels = (int) [ 1, 8 ], " \
+    "endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
+    "width = (int) { 32, 64 };" \
+  "audio/x-raw-int, " \
+    "rate = (int) [ 1, MAX ], " \
+    "channels = (int) [ 1, 8 ], " \
+    "endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
+    "width = (int) 32, " \
+    "depth = (int) [ 1, 32 ], " \
+    "signed = (boolean) { true, false }; " \
+  "audio/x-raw-int, " \
+    "rate = (int) [ 1, MAX ], " \
+    "channels = (int) [ 1, 8 ], " \
+    "endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
+    "width = (int) 24, " \
+    "depth = (int) [ 1, 24 ], " \
+    "signed = (boolean) { true, false }; " \
+  "audio/x-raw-int, " \
+    "rate = (int) [ 1, MAX ], " \
+    "channels = (int) [ 1, 8 ], " \
+    "endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
+    "width = (int) 16, " \
+    "depth = (int) [ 1, 16 ], " \
+    "signed = (boolean) { true, false }; " \
+  "audio/x-raw-int, " \
+    "rate = (int) [ 1, MAX ], " \
+    "channels = (int) [ 1, 8 ], " \
+    "endianness = (int) { LITTLE_ENDIAN, BIG_ENDIAN }, " \
+    "width = (int) 8, " \
+    "depth = (int) [ 1, 8 ], " \
+    "signed = (boolean) { true, false } "
+
+static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (CONVERT_CAPS_TEMPLATE_STRING)
+    );
+static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (CONVERT_CAPS_TEMPLATE_STRING)
+    );
+
+/* takes over reference for outcaps */
+static GstElement *
+setup_audioconvert (GstCaps * outcaps)
+{
+  GstElement *audioconvert;
+
+  GST_DEBUG ("setup_audioconvert with caps %" GST_PTR_FORMAT, outcaps);
+  audioconvert = gst_check_setup_element ("audioconvert");
+  g_object_set (G_OBJECT (audioconvert), "dithering", 0, NULL);
+  g_object_set (G_OBJECT (audioconvert), "noise-shaping", 0, NULL);
+  mysrcpad = gst_check_setup_src_pad (audioconvert, &srctemplate, NULL);
+  mysinkpad = gst_check_setup_sink_pad (audioconvert, &sinktemplate, NULL);
+  /* this installs a getcaps func that will always return the caps we set
+   * later */
+  gst_pad_use_fixed_caps (mysinkpad);
+  gst_pad_set_caps (mysinkpad, outcaps);
+  gst_caps_unref (outcaps);
+  outcaps = gst_pad_get_negotiated_caps (mysinkpad);
+  fail_unless (gst_caps_is_fixed (outcaps));
+  gst_caps_unref (outcaps);
+
+  gst_pad_set_active (mysrcpad, TRUE);
+  gst_pad_set_active (mysinkpad, TRUE);
+
+  return audioconvert;
+}
+
+static void
+cleanup_audioconvert (GstElement * audioconvert)
+{
+  GST_DEBUG ("cleanup_audioconvert");
+
+  gst_pad_set_active (mysrcpad, FALSE);
+  gst_pad_set_active (mysinkpad, FALSE);
+  gst_check_teardown_src_pad (audioconvert);
+  gst_check_teardown_sink_pad (audioconvert);
+  gst_check_teardown_element (audioconvert);
+}
+
+/* returns a newly allocated caps */
+static GstCaps *
+get_int_caps (guint channels, gchar * endianness, guint width,
+    guint depth, gboolean signedness)
+{
+  GstCaps *caps;
+  gchar *string;
+
+  string = g_strdup_printf ("audio/x-raw-int, "
+      "rate = (int) 44100, "
+      "channels = (int) %d, "
+      "endianness = (int) %s, "
+      "width = (int) %d, "
+      "depth = (int) %d, "
+      "signed = (boolean) %s ",
+      channels, endianness, width, depth, signedness ? "true" : "false");
+  GST_DEBUG ("creating caps from %s", string);
+  caps = gst_caps_from_string (string);
+  g_free (string);
+  fail_unless (caps != NULL);
+  GST_DEBUG ("returning caps %p", caps);
+  return caps;
+}
+
+/* returns a newly allocated caps */
+static GstCaps *
+get_float_caps (guint channels, gchar * endianness, guint width)
+{
+  GstCaps *caps;
+  gchar *string;
+
+  string = g_strdup_printf ("audio/x-raw-float, "
+      "rate = (int) 44100, "
+      "channels = (int) %d, "
+      "endianness = (int) %s, "
+      "width = (int) %d ", channels, endianness, width);
+  GST_DEBUG ("creating caps from %s", string);
+  caps = gst_caps_from_string (string);
+  g_free (string);
+  fail_unless (caps != NULL);
+  GST_DEBUG ("returning caps %p", caps);
+  return caps;
+}
+
+/* Copied from vorbis; the particular values used don't matter */
+static GstAudioChannelPosition channelpositions[][6] = {
+  {                             /* Mono */
+      GST_AUDIO_CHANNEL_POSITION_FRONT_MONO},
+  {                             /* Stereo */
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+      GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
+  {                             /* Stereo + Centre */
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+      GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
+  {                             /* Quadraphonic */
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+      },
+  {                             /* Stereo + Centre + rear stereo */
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+      },
+  {                             /* Full 5.1 Surround */
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_LFE,
+      }
+};
+
+/* these are a bunch of random positions, they are mostly just
+ * different from the ones above, don't use elsewhere */
+static GstAudioChannelPosition mixed_up_positions[][6] = {
+  {
+      GST_AUDIO_CHANNEL_POSITION_FRONT_MONO},
+  {
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+      GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT},
+  {
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+      GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT},
+  {
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+      },
+  {
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+      },
+  {
+        GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+        GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+        GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+        GST_AUDIO_CHANNEL_POSITION_LFE,
+      }
+};
+
+static void
+set_channel_positions (GstCaps * caps, int channels,
+    GstAudioChannelPosition * channelpositions)
+{
+  GValue chanpos = { 0 };
+  GValue pos = { 0 };
+  GstStructure *structure = gst_caps_get_structure (caps, 0);
+  int c;
+
+  g_value_init (&chanpos, GST_TYPE_ARRAY);
+  g_value_init (&pos, GST_TYPE_AUDIO_CHANNEL_POSITION);
+
+  for (c = 0; c < channels; c++) {
+    g_value_set_enum (&pos, channelpositions[c]);
+    gst_value_array_append_value (&chanpos, &pos);
+  }
+  g_value_unset (&pos);
+
+  gst_structure_set_value (structure, "channel-positions", &chanpos);
+  g_value_unset (&chanpos);
+}
+
+/* For channels > 2, caps have to have channel positions. This adds some simple
+ * ones. Only implemented for channels between 1 and 6.
+ */
+static GstCaps *
+get_float_mc_caps (guint channels, gchar * endianness, guint width,
+    gboolean mixed_up_layout)
+{
+  GstCaps *caps = get_float_caps (channels, endianness, width);
+
+  if (channels <= 6) {
+    if (mixed_up_layout)
+      set_channel_positions (caps, channels, mixed_up_positions[channels - 1]);
+    else
+      set_channel_positions (caps, channels, channelpositions[channels - 1]);
+  }
+
+  return caps;
+}
+
+static GstCaps *
+get_int_mc_caps (guint channels, gchar * endianness, guint width,
+    guint depth, gboolean signedness, gboolean mixed_up_layout)
+{
+  GstCaps *caps = get_int_caps (channels, endianness, width, depth, signedness);
+
+  if (channels <= 6) {
+    if (mixed_up_layout)
+      set_channel_positions (caps, channels, mixed_up_positions[channels - 1]);
+    else
+      set_channel_positions (caps, channels, channelpositions[channels - 1]);
+  }
+
+  return caps;
+}
+
+/* eats the refs to the caps */
+static void
+verify_convert (const gchar * which, void *in, int inlength,
+    GstCaps * incaps, void *out, int outlength, GstCaps * outcaps)
+{
+  GstBuffer *inbuffer, *outbuffer;
+  GstElement *audioconvert;
+
+  GST_DEBUG ("verifying conversion %s", which);
+  GST_DEBUG ("incaps: %" GST_PTR_FORMAT, incaps);
+  GST_DEBUG ("outcaps: %" GST_PTR_FORMAT, outcaps);
+  ASSERT_CAPS_REFCOUNT (incaps, "incaps", 1);
+  ASSERT_CAPS_REFCOUNT (outcaps, "outcaps", 1);
+  audioconvert = setup_audioconvert (outcaps);
+  ASSERT_CAPS_REFCOUNT (outcaps, "outcaps", 1);
+
+  fail_unless (gst_element_set_state (audioconvert,
+          GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS,
+      "could not set to playing");
+
+  GST_DEBUG ("Creating buffer of %d bytes", inlength);
+  inbuffer = gst_buffer_new_and_alloc (inlength);
+  memcpy (GST_BUFFER_DATA (inbuffer), in, inlength);
+  gst_buffer_set_caps (inbuffer, incaps);
+  ASSERT_CAPS_REFCOUNT (incaps, "incaps", 2);
+  ASSERT_BUFFER_REFCOUNT (inbuffer, "inbuffer", 1);
+
+  /* pushing gives away my reference ... */
+  GST_DEBUG ("push it");
+  fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK);
+  GST_DEBUG ("pushed it");
+  /* ... and puts a new buffer on the global list */
+  fail_unless (g_list_length (buffers) == 1);
+  fail_if ((outbuffer = (GstBuffer *) buffers->data) == NULL);
+
+  ASSERT_BUFFER_REFCOUNT (outbuffer, "outbuffer", 1);
+  fail_unless_equals_int (GST_BUFFER_SIZE (outbuffer), outlength);
+
+  if (memcmp (GST_BUFFER_DATA (outbuffer), out, outlength) != 0) {
+    g_print ("\nInput data:\n");
+    gst_util_dump_mem (in, inlength);
+    g_print ("\nConverted data:\n");
+    gst_util_dump_mem (GST_BUFFER_DATA (outbuffer), outlength);
+    g_print ("\nExpected data:\n");
+    gst_util_dump_mem (out, outlength);
+  }
+  fail_unless (memcmp (GST_BUFFER_DATA (outbuffer), out, outlength) == 0,
+      "failed converting %s", which);
+
+  /* make sure that the channel positions are not lost */
+  {
+    GstStructure *in_s, *out_s;
+    gint out_chans;
+
+    in_s = gst_caps_get_structure (incaps, 0);
+    out_s = gst_caps_get_structure (GST_BUFFER_CAPS (outbuffer), 0);
+    fail_unless (gst_structure_get_int (out_s, "channels", &out_chans));
+
+    /* positions for 1 and 2 channels are implicit if not provided */
+    if (out_chans > 2 && gst_structure_has_field (in_s, "channel-positions")) {
+      if (!gst_structure_has_field (out_s, "channel-positions")) {
+        g_error ("Channel layout got lost somewhere:\n\nIns : %s\nOuts: %s\n",
+            gst_structure_to_string (in_s), gst_structure_to_string (out_s));
+      }
+    }
+  }
+
+  buffers = g_list_remove (buffers, outbuffer);
+  gst_buffer_unref (outbuffer);
+  fail_unless (gst_element_set_state (audioconvert,
+          GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS, "could not set to null");
+  /* cleanup */
+  GST_DEBUG ("cleanup audioconvert");
+  cleanup_audioconvert (audioconvert);
+  GST_DEBUG ("cleanup, unref incaps");
+  ASSERT_CAPS_REFCOUNT (incaps, "incaps", 1);
+  gst_caps_unref (incaps);
+}
+
+
+#define RUN_CONVERSION(which, inarray, in_get_caps, outarray, out_get_caps)    \
+  verify_convert (which, inarray, sizeof (inarray),                            \
+        in_get_caps, outarray, sizeof (outarray), out_get_caps)
+
+
+GST_START_TEST (test_int16)
+{
+  /* stereo to mono */
+  {
+    gint16 in[] = { 16384, -256, 1024, 1024 };
+    gint16 out[] = { 8064, 1024 };
+
+    RUN_CONVERSION ("int16 stereo to mono",
+        in, get_int_caps (2, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+  }
+  /* mono to stereo */
+  {
+    gint16 in[] = { 512, 1024 };
+    gint16 out[] = { 512, 512, 1024, 1024 };
+
+    RUN_CONVERSION ("int16 mono to stereo",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (2, "BYTE_ORDER", 16, 16, TRUE));
+  }
+  /* signed -> unsigned */
+  {
+    gint16 in[] = { 0, -32767, 32767, -32768 };
+    guint16 out[] = { 32768, 1, 65535, 0 };
+
+    RUN_CONVERSION ("int16 signed to unsigned",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE));
+    RUN_CONVERSION ("int16 unsigned to signed",
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE),
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+  }
+}
+
+GST_END_TEST;
+
+
+GST_START_TEST (test_float32)
+{
+  /* stereo to mono */
+  {
+    gfloat in[] = { 0.6, -0.0078125, 0.03125, 0.03125 };
+    gfloat out[] = { 0.29609375, 0.03125 };
+
+    RUN_CONVERSION ("float32 stereo to mono",
+        in, get_float_caps (2, "BYTE_ORDER", 32),
+        out, get_float_caps (1, "BYTE_ORDER", 32));
+  }
+  /* mono to stereo */
+  {
+    gfloat in[] = { 0.015625, 0.03125 };
+    gfloat out[] = { 0.015625, 0.015625, 0.03125, 0.03125 };
+
+    RUN_CONVERSION ("float32 mono to stereo",
+        in, get_float_caps (1, "BYTE_ORDER", 32),
+        out, get_float_caps (2, "BYTE_ORDER", 32));
+  }
+}
+
+GST_END_TEST;
+
+
+GST_START_TEST (test_int_conversion)
+{
+  /* 8 <-> 16 signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gint8 in[] = { 0, 1, 2, 127, -127 };
+    gint16 out[] = { 0, 256, 512, 32512, -32512 };
+
+    RUN_CONVERSION ("int 8bit to 16bit signed",
+        in, get_int_caps (1, "BYTE_ORDER", 8, 8, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE)
+        );
+    RUN_CONVERSION ("int 16bit signed to 8bit",
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        in, get_int_caps (1, "BYTE_ORDER", 8, 8, TRUE)
+        );
+  }
+  /* 16 -> 8 signed */
+  {
+    gint16 in[] = { 0, 127, 128, 256, 256 + 127, 256 + 128 };
+    gint8 out[] = { 0, 0, 1, 1, 1, 2 };
+
+    RUN_CONVERSION ("16 bit to 8 signed",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 8, 8, TRUE)
+        );
+  }
+  /* 8 unsigned <-> 16 signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    guint8 in[] = { 128, 129, 130, 255, 1 };
+    gint16 out[] = { 0, 256, 512, 32512, -32512 };
+    GstCaps *incaps, *outcaps;
+
+    /* exploded for easier valgrinding */
+    incaps = get_int_caps (1, "BYTE_ORDER", 8, 8, FALSE);
+    outcaps = get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE);
+    GST_DEBUG ("incaps: %" GST_PTR_FORMAT, incaps);
+    GST_DEBUG ("outcaps: %" GST_PTR_FORMAT, outcaps);
+    RUN_CONVERSION ("8 unsigned to 16 signed", in, incaps, out, outcaps);
+    RUN_CONVERSION ("16 signed to 8 unsigned", out, get_int_caps (1,
+            "BYTE_ORDER", 16, 16, TRUE), in, get_int_caps (1, "BYTE_ORDER", 8,
+            8, FALSE)
+        );
+  }
+  /* 8 <-> 24 signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gint8 in[] = { 0, 1, 127 };
+    guint8 out[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x7f };
+    /* out has the bytes in little-endian, so that's how they should be
+     * interpreted during conversion */
+
+    RUN_CONVERSION ("8 to 24 signed", in, get_int_caps (1, "BYTE_ORDER", 8, 8,
+            TRUE), out, get_int_caps (1, "LITTLE_ENDIAN", 24, 24, TRUE)
+        );
+    RUN_CONVERSION ("24 signed to 8", out, get_int_caps (1, "LITTLE_ENDIAN", 24,
+            24, TRUE), in, get_int_caps (1, "BYTE_ORDER", 8, 8, TRUE)
+        );
+  }
+
+  /* 16 bit signed <-> unsigned */
+  {
+    gint16 in[] = { 0, 128, -128 };
+    guint16 out[] = { 32768, 32896, 32640 };
+    RUN_CONVERSION ("16 signed to 16 unsigned",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE)
+        );
+    RUN_CONVERSION ("16 unsigned to 16 signed",
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE),
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE)
+        );
+  }
+
+  /* 16 bit signed <-> 8 in 16 bit signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gint16 in[] = { 0, 64 << 8, -64 << 8 };
+    gint16 out[] = { 0, 64, -64 };
+    RUN_CONVERSION ("16 signed to 8 in 16 signed",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 8, TRUE)
+        );
+    RUN_CONVERSION ("8 in 16 signed to 16 signed",
+        out, get_int_caps (1, "BYTE_ORDER", 16, 8, TRUE),
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE)
+        );
+  }
+
+  /* 16 bit unsigned <-> 8 in 16 bit unsigned */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    guint16 in[] = { 1 << 15, (1 << 15) - (64 << 8), (1 << 15) + (64 << 8) };
+    guint16 out[] = { 1 << 7, (1 << 7) - 64, (1 << 7) + 64 };
+    RUN_CONVERSION ("16 unsigned to 8 in 16 unsigned",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 8, FALSE)
+        );
+    RUN_CONVERSION ("8 in 16 unsigned to 16 unsigned",
+        out, get_int_caps (1, "BYTE_ORDER", 16, 8, FALSE),
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE)
+        );
+  }
+
+  /* 32 bit signed -> 16 bit signed for rounding check */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gint32 in[] = { 0, G_MININT32, G_MAXINT32,
+      (32 << 16), (32 << 16) + (1 << 15), (32 << 16) - (1 << 15),
+      (32 << 16) + (2 << 15), (32 << 16) - (2 << 15),
+      (-32 << 16) + (1 << 15), (-32 << 16) - (1 << 15),
+      (-32 << 16) + (2 << 15), (-32 << 16) - (2 << 15),
+      (-32 << 16)
+    };
+    gint16 out[] = { 0, G_MININT16, G_MAXINT16,
+      32, 33, 32,
+      33, 31,
+      -31, -32,
+      -31, -33,
+      -32
+    };
+    RUN_CONVERSION ("32 signed to 16 signed for rounding",
+        in, get_int_caps (1, "BYTE_ORDER", 32, 32, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE)
+        );
+  }
+
+  /* 32 bit signed -> 16 bit unsigned for rounding check */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gint32 in[] = { 0, G_MININT32, G_MAXINT32,
+      (32 << 16), (32 << 16) + (1 << 15), (32 << 16) - (1 << 15),
+      (32 << 16) + (2 << 15), (32 << 16) - (2 << 15),
+      (-32 << 16) + (1 << 15), (-32 << 16) - (1 << 15),
+      (-32 << 16) + (2 << 15), (-32 << 16) - (2 << 15),
+      (-32 << 16)
+    };
+    guint16 out[] = { (1 << 15), 0, G_MAXUINT16,
+      (1 << 15) + 32, (1 << 15) + 33, (1 << 15) + 32,
+      (1 << 15) + 33, (1 << 15) + 31,
+      (1 << 15) - 31, (1 << 15) - 32,
+      (1 << 15) - 31, (1 << 15) - 33,
+      (1 << 15) - 32
+    };
+    RUN_CONVERSION ("32 signed to 16 unsigned for rounding",
+        in, get_int_caps (1, "BYTE_ORDER", 32, 32, TRUE),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, FALSE)
+        );
+  }
+}
+
+GST_END_TEST;
+
+GST_START_TEST (test_float_conversion)
+{
+  /* 32 float <-> 16 signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gfloat in_le[] =
+        { GFLOAT_TO_LE (0.0), GFLOAT_TO_LE (1.0), GFLOAT_TO_LE (-1.0),
+      GFLOAT_TO_LE (0.5), GFLOAT_TO_LE (-0.5), GFLOAT_TO_LE (1.1),
+      GFLOAT_TO_LE (-1.1)
+    };
+    gfloat in_be[] =
+        { GFLOAT_TO_BE (0.0), GFLOAT_TO_BE (1.0), GFLOAT_TO_BE (-1.0),
+      GFLOAT_TO_BE (0.5), GFLOAT_TO_BE (-0.5), GFLOAT_TO_BE (1.1),
+      GFLOAT_TO_BE (-1.1)
+    };
+    gint16 out[] = { 0, 32767, -32768, 16384, -16384, 32767, -32768 };
+
+    /* only one direction conversion, the other direction does
+     * not produce exactly the same as the input due to floating
+     * point rounding errors etc. */
+    RUN_CONVERSION ("32 float le to 16 signed",
+        in_le, get_float_caps (1, "LITTLE_ENDIAN", 32),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+    RUN_CONVERSION ("32 float be to 16 signed",
+        in_be, get_float_caps (1, "BIG_ENDIAN", 32),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+  }
+
+  {
+    gint16 in[] = { 0, -32768, 16384, -16384 };
+    gfloat out[] = { 0.0, -1.0, 0.5, -0.5 };
+
+    RUN_CONVERSION ("16 signed to 32 float",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_float_caps (1, "BYTE_ORDER", 32));
+  }
+
+  /* 64 float <-> 16 signed */
+  /* NOTE: if audioconvert was doing dithering we'd have a problem */
+  {
+    gdouble in_le[] =
+        { GDOUBLE_TO_LE (0.0), GDOUBLE_TO_LE (1.0), GDOUBLE_TO_LE (-1.0),
+      GDOUBLE_TO_LE (0.5), GDOUBLE_TO_LE (-0.5), GDOUBLE_TO_LE (1.1),
+      GDOUBLE_TO_LE (-1.1)
+    };
+    gdouble in_be[] =
+        { GDOUBLE_TO_BE (0.0), GDOUBLE_TO_BE (1.0), GDOUBLE_TO_BE (-1.0),
+      GDOUBLE_TO_BE (0.5), GDOUBLE_TO_BE (-0.5), GDOUBLE_TO_BE (1.1),
+      GDOUBLE_TO_BE (-1.1)
+    };
+    gint16 out[] = { 0, 32767, -32768, 16384, -16384, 32767, -32768 };
+
+    /* only one direction conversion, the other direction does
+     * not produce exactly the same as the input due to floating
+     * point rounding errors etc. */
+    RUN_CONVERSION ("64 float LE to 16 signed",
+        in_le, get_float_caps (1, "LITTLE_ENDIAN", 64),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+    RUN_CONVERSION ("64 float BE to 16 signed",
+        in_be, get_float_caps (1, "BIG_ENDIAN", 64),
+        out, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE));
+  }
+  {
+    gint16 in[] = { 0, -32768, 16384, -16384 };
+    gdouble out[] = { 0.0,
+      (gdouble) (-32768L << 16) / 2147483647.0, /* ~ -1.0 */
+      (gdouble) (16384L << 16) / 2147483647.0,  /* ~  0.5 */
+      (gdouble) (-16384L << 16) / 2147483647.0, /* ~ -0.5 */
+    };
+
+    RUN_CONVERSION ("16 signed to 64 float",
+        in, get_int_caps (1, "BYTE_ORDER", 16, 16, TRUE),
+        out, get_float_caps (1, "BYTE_ORDER", 64));
+  }
+  {
+    gint32 in[] = { 0, (-1L << 31), (1L << 30), (-1L << 30) };
+    gdouble out[] = { 0.0,
+      (gdouble) (-1L << 31) / 2147483647.0,     /* ~ -1.0 */
+      (gdouble) (1L << 30) / 2147483647.0,      /* ~  0.5 */
+      (gdouble) (-1L << 30) / 2147483647.0,     /* ~ -0.5 */
+    };
+
+    RUN_CONVERSION ("32 signed to 64 float",
+        in, get_int_caps (1, "BYTE_ORDER", 32, 32, TRUE),
+        out, get_float_caps (1, "BYTE_ORDER", 64));
+  }
+
+  /* 64-bit float <-> 32-bit float */
+  {
+    gdouble in[] = { 0.0, 1.0, -1.0, 0.5, -0.5 };
+    gfloat out[] = { 0.0, 1.0, -1.0, 0.5, -0.5 };
+
+    RUN_CONVERSION ("64 float to 32 float",
+        in, get_float_caps (1, "BYTE_ORDER", 64),
+        out, get_float_caps (1, "BYTE_ORDER", 32));
+
+    RUN_CONVERSION ("32 float to 64 float",
+        out, get_float_caps (1, "BYTE_ORDER", 32),
+        in, get_float_caps (1, "BYTE_ORDER", 64));
+  }
+
+  /* 32-bit float little endian <-> big endian */
+  {
+    gfloat le[] = { GFLOAT_TO_LE (0.0), GFLOAT_TO_LE (1.0), GFLOAT_TO_LE (-1.0),
+      GFLOAT_TO_LE (0.5), GFLOAT_TO_LE (-0.5)
+    };
+    gfloat be[] = { GFLOAT_TO_BE (0.0), GFLOAT_TO_BE (1.0), GFLOAT_TO_BE (-1.0),
+      GFLOAT_TO_BE (0.5), GFLOAT_TO_BE (-0.5)
+    };
+
+    RUN_CONVERSION ("32 float LE to BE",
+        le, get_float_caps (1, "LITTLE_ENDIAN", 32),
+        be, get_float_caps (1, "BIG_ENDIAN", 32));
+
+    RUN_CONVERSION ("32 float BE to LE",
+        be, get_float_caps (1, "BIG_ENDIAN", 32),
+        le, get_float_caps (1, "LITTLE_ENDIAN", 32));
+  }
+
+  /* 64-bit float little endian <-> big endian */
+  {
+    gdouble le[] =
+        { GDOUBLE_TO_LE (0.0), GDOUBLE_TO_LE (1.0), GDOUBLE_TO_LE (-1.0),
+      GDOUBLE_TO_LE (0.5), GDOUBLE_TO_LE (-0.5)
+    };
+    gdouble be[] =
+        { GDOUBLE_TO_BE (0.0), GDOUBLE_TO_BE (1.0), GDOUBLE_TO_BE (-1.0),
+      GDOUBLE_TO_BE (0.5), GDOUBLE_TO_BE (-0.5)
+    };
+
+    RUN_CONVERSION ("64 float LE to BE",
+        le, get_float_caps (1, "LITTLE_ENDIAN", 64),
+        be, get_float_caps (1, "BIG_ENDIAN", 64));
+
+    RUN_CONVERSION ("64 float BE to LE",
+        be, get_float_caps (1, "BIG_ENDIAN", 64),
+        le, get_float_caps (1, "LITTLE_ENDIAN", 64));
+  }
+}
+
+GST_END_TEST;
+
+
+GST_START_TEST (test_multichannel_conversion)
+{
+  {
+    /* Ensure that audioconvert prefers to convert to integer, rather than mix
+     * to mono
+     */
+    gfloat in[] = { 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 };
+    gfloat out[] = { 0.0, 0.0 };
+
+    /* only one direction conversion, the other direction does
+     * not produce exactly the same as the input due to floating
+     * point rounding errors etc. */
+    RUN_CONVERSION ("3 channels to 1", in, get_float_mc_caps (3,
+            "BYTE_ORDER", 32, FALSE), out, get_float_caps (1, "BYTE_ORDER",
+            32));
+  }
+}
+
+GST_END_TEST;
+
+
+GST_START_TEST (test_channel_remapping)
+{
+  /* float */
+  {
+    gfloat in[] = { 0.0, 1.0, -0.5 };
+    gfloat out[] = { -0.5, 1.0, 0.0 };
+    GstCaps *in_caps = get_float_mc_caps (3, "BYTE_ORDER", 32, FALSE);
+    GstCaps *out_caps = get_float_mc_caps (3, "BYTE_ORDER", 32, TRUE);
+
+    RUN_CONVERSION ("3 channels layout remapping float", in, in_caps,
+        out, out_caps);
+  }
+
+  /* int */
+  {
+    guint16 in[] = { 0, 65535, 0x9999 };
+    guint16 out[] = { 0x9999, 65535, 0 };
+    GstCaps *in_caps = get_int_mc_caps (3, "BYTE_ORDER", 16, 16, FALSE, FALSE);
+    GstCaps *out_caps = get_int_mc_caps (3, "BYTE_ORDER", 16, 16, FALSE, TRUE);
+
+    RUN_CONVERSION ("3 channels layout remapping int", in, in_caps,
+        out, out_caps);
+  }
+
+  /* TODO: float => int conversion with remapping and vice versa,
+   *       int   => int conversion with remapping */
+}
+
+GST_END_TEST;
+
+GST_START_TEST (test_caps_negotiation)
+{
+  GstElement *src, *ac1, *ac2, *ac3, *sink;
+  GstElement *pipeline;
+  GstPad *ac3_src;
+  GstCaps *caps1, *caps2;
+
+  pipeline = gst_pipeline_new ("test");
+
+  /* create elements */
+  src = gst_element_factory_make ("audiotestsrc", "src");
+  ac1 = gst_element_factory_make ("audioconvert", "ac1");
+  ac2 = gst_element_factory_make ("audioconvert", "ac2");
+  ac3 = gst_element_factory_make ("audioconvert", "ac3");
+  sink = gst_element_factory_make ("fakesink", "sink");
+  ac3_src = gst_element_get_pad (ac3, "src");
+
+  /* test with 2 audioconvert elements */
+  gst_bin_add_many (GST_BIN (pipeline), src, ac1, ac3, sink, NULL);
+  gst_element_link_many (src, ac1, ac3, sink, NULL);
+
+  /* Set to PAUSED and wait for PREROLL */
+  fail_if (gst_element_set_state (pipeline, GST_STATE_PAUSED) ==
+      GST_STATE_CHANGE_FAILURE, "Failed to set test pipeline to PAUSED");
+  fail_if (gst_element_get_state (pipeline, NULL, NULL, GST_CLOCK_TIME_NONE) !=
+      GST_STATE_CHANGE_SUCCESS, "Failed to set test pipeline to PAUSED");
+
+  caps1 = gst_pad_get_caps (ac3_src);
+  fail_if (caps1 == NULL, "gst_pad_get_caps returned NULL");
+  GST_DEBUG ("Caps size 1 : %d", gst_caps_get_size (caps1));
+
+  fail_if (gst_element_set_state (pipeline, GST_STATE_READY) ==
+      GST_STATE_CHANGE_FAILURE, "Failed to set test pipeline back to READY");
+  fail_if (gst_element_get_state (pipeline, NULL, NULL, GST_CLOCK_TIME_NONE) !=
+      GST_STATE_CHANGE_SUCCESS, "Failed to set test pipeline back to READY");
+
+  /* test with 3 audioconvert elements */
+  gst_element_unlink (ac1, ac3);
+  gst_bin_add (GST_BIN (pipeline), ac2);
+  gst_element_link_many (ac1, ac2, ac3, NULL);
+
+  fail_if (gst_element_set_state (pipeline, GST_STATE_PAUSED) ==
+      GST_STATE_CHANGE_FAILURE, "Failed to set test pipeline back to PAUSED");
+  fail_if (gst_element_get_state (pipeline, NULL, NULL, GST_CLOCK_TIME_NONE) !=
+      GST_STATE_CHANGE_SUCCESS, "Failed to set test pipeline back to PAUSED");
+
+  caps2 = gst_pad_get_caps (ac3_src);
+
+  fail_if (caps2 == NULL, "gst_pad_get_caps returned NULL");
+  GST_DEBUG ("Caps size 2 : %d", gst_caps_get_size (caps2));
+  fail_unless (gst_caps_get_size (caps1) == gst_caps_get_size (caps2));
+
+  gst_caps_unref (caps1);
+  gst_caps_unref (caps2);
+
+  fail_if (gst_element_set_state (pipeline, GST_STATE_NULL) ==
+      GST_STATE_CHANGE_FAILURE, "Failed to set test pipeline back to NULL");
+  fail_if (gst_element_get_state (pipeline, NULL, NULL, GST_CLOCK_TIME_NONE) !=
+      GST_STATE_CHANGE_SUCCESS, "Failed to set test pipeline back to NULL");
+
+  gst_object_unref (ac3_src);
+  gst_object_unref (pipeline);
+}
+
+GST_END_TEST;
+
+
+static Suite *
+audioconvert_suite (void)
+{
+  Suite *s = suite_create ("audioconvert");
+  TCase *tc_chain = tcase_create ("general");
+
+  suite_add_tcase (s, tc_chain);
+  tcase_add_test (tc_chain, test_int16);
+  tcase_add_test (tc_chain, test_float32);
+  tcase_add_test (tc_chain, test_int_conversion);
+  tcase_add_test (tc_chain, test_float_conversion);
+  tcase_add_test (tc_chain, test_multichannel_conversion);
+  tcase_add_test (tc_chain, test_channel_remapping);
+  tcase_add_test (tc_chain, test_caps_negotiation);
+
+  return s;
+}
+
+int
+main (int argc, char **argv)
+{
+  int nf;
+
+  Suite *s = audioconvert_suite ();
+  SRunner *sr = srunner_create (s);
+
+  gst_check_init (&argc, &argv);
+
+  srunner_run_all (sr, CK_NORMAL);
+  nf = srunner_ntests_failed (sr);
+  srunner_free (sr);
+
+  return nf;
+}