diff -r 000000000000 -r 0e761a78d257 gst_plugins_base/gst-libs/gst/pbutils/descriptions.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst-libs/gst/pbutils/descriptions.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,999 @@
+/* GStreamer Plugins Base utils library source/sink/codec description support
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstpbutilsdescriptions
+ * @short_description: Provides human-readable descriptions for caps/codecs
+ * and encoder, decoder, URI source and URI sink elements
+ *
+ * <refsect2>
+ * <para>
+ * The above functions provide human-readable strings for media formats
+ * and decoder/demuxer/depayloader/encoder/muxer/payloader elements for use
+ * in error dialogs or other messages shown to users.
+ * </para>
+ * <para>
+ * gst_pb_utils_add_codec_description_to_tag_list() is a utility function
+ * for demuxer and decoder elements to add audio/
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+video codec tags from a
+ * given (fixed) #GstCaps.
+ * </para>
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef __SYMBIAN32__
+#include <gst_global.h>
+#endif
+
+#include "gst/gst-i18n-plugin.h"
+
+#include "pbutils.h"
+
+#include <string.h>
+
+typedef enum
+{
+  FLAG_CONTAINER = (1 << 0),    /* format is a container format (muxed)             */
+  FLAG_SYSTEMSTREAM = (1 << 1)  /* match record only if caps have systemstream=true */
+} FormatFlags;
+
+typedef struct
+{
+  const gchar *type;
+  const gchar *desc;
+  FormatFlags flags;
+} FormatInfo;
+
+static const FormatInfo formats[] = {
+  /* container/tag formats with static descriptions */
+  {"application/ogg", "Ogg", FLAG_CONTAINER},
+  {"application/vnd.rn-realmedia", "Realmedia", FLAG_CONTAINER},
+  {"application/x-id3", N_("ID3 tag"), FLAG_CONTAINER},
+  {"application/x-ape", N_("APE tag"), FLAG_CONTAINER},
+  {"application/x-icy", N_("ICY internet radio"), FLAG_CONTAINER},
+  {"video/x-fli", "FLI/FLC/FLX Animation", FLAG_CONTAINER},
+  {"video/x-flv", "Flash", FLAG_CONTAINER},
+  {"video/x-matroska", "Matroska", FLAG_CONTAINER},
+  {"video/x-ms-asf", "Advanced Streaming Format (ASF)", FLAG_CONTAINER},
+  {"video/x-msvideo", "AVI", FLAG_CONTAINER},
+  {"video/x-quicktime", "Quicktime", FLAG_CONTAINER},
+  {"video/quicktime", "Quicktime", FLAG_CONTAINER},
+
+  /* audio formats with static descriptions */
+  {"audio/x-ac3", "AC-3 (ATSC A/52)", 0},
+  {"audio/ac3", "AC-3 (ATSC A/52)", 0},
+  {"audio/x-private-ac3", "DVD AC-3 (ATSC A/52)", 0},
+  {"audio/x-private1-ac3", "DVD AC-3 (ATSC A/52)", 0},
+  {"audio/x-alaw", "A-Law", 0},
+  {"audio/amr", "Adaptive Multi Rate (AMR)", 0},
+  {"audio/AMR", "Adaptive Multi Rate (AMR)", 0},
+  {"audio/AMR-WB", "Adaptive Multi Rate WideBand (AMR-WB)", 0},
+  {"audio/iLBC-sh", "Internet Low Bitrate Codec (iLBC)", 0},
+  {"audio/ms-gsm", "MS GSM", 0},
+  {"audio/qcelp", "QCELP", 0},
+  {"audio/aiff", "Audio Interchange File Format (AIFF)", 0},
+  {"audio/x-aiff", "Audio Interchange File Format (AIFF)", 0},
+  {"audio/x-alac", N_("Apple Lossless Audio (ALAC)"), 0},
+  {"audio/x-amr-nb-sh", "Adaptive Multi Rate NarrowBand (AMR-NB)", 0},
+  {"audio/x-amr-wb-sh", "Adaptive Multi Rate WideBand (AMR-WB)", 0},
+  {"audio/x-au", "Sun .au", 0},
+  {"audio/x-cinepak", "Cinepak Audio", 0},
+  {"audio/x-dpcm", "DPCM", 0},
+  {"audio/x-dts", "DTS", 0},
+  {"audio/x-private1-dts", "DTS", 0},
+  {"audio/x-dv", "DV Audio", 0},
+  {"audio/x-flac", N_("Free Lossless Audio Codec (FLAC)"), 0},
+  {"audio/x-gsm", "GSM", 0},
+  {"audio/x-iec958", "S/PDIF IEC958", 0},       /* TODO: check description */
+  {"audio/x-iLBC", "Internet Low Bitrate Codec (iLBC)", 0},
+  {"audio/x-ircam", "Berkeley/IRCAM/CARL", 0},
+  {"audio/x-lpcm", "LPCM", 0},
+  {"audio/x-private1-lpcm", "DVD LPCM", 0},
+  {"audio/x-m4a", "MPEG-4 AAC", FLAG_CONTAINER},
+  {"audio/x-mod", "Module Music Format (MOD)", 0},
+  {"audio/x-mulaw", "Mu-Law", 0},
+  {"audio/x-musepack", "Musepack (MPC)", 0},
+  {"audio/x-nellymoser", "Nellymoser Asao", 0},
+  {"audio/x-nist", "Sphere NIST", 0},
+  {"audio/x-nsf", "Nintendo NSF", 0},
+  {"audio/x-paris", "Ensoniq PARIS", 0},
+  {"audio/x-qdm2", "QDesign Music (QDM) 2", 0},
+  {"audio/x-ralf-mpeg4-generic", "Real Audio Lossless (RALF)", 0},
+  {"audio/x-sds", "SDS", 0},
+  {"audio/x-shorten", "Shorten Lossless", 0},
+  {"audio/x-sid", "Sid", 0},
+  {"audio/x-sipro", "Sipro/ACELP.NET Voice", 0},
+  {"audio/x-spc", "SNES-SPC700 Sound File Data", 0},
+  {"audio/x-speex", "Speex", 0},
+  {"audio/x-svx", "Amiga IFF / SVX8 / SV16", 0},
+  {"audio/x-tta", N_("Lossless True Audio (TTA)"), 0},
+  {"audio/x-ttafile", N_("Lossless True Audio (TTA)"), 0},
+  {"audio/x-vnd.sony.atrac3", "Sony ATRAC3", 0},
+  {"audio/x-vorbis", "Vorbis", 0},
+  {"audio/x-voc", "SoundBlaster VOC", 0},
+  {"audio/x-w64", "Sonic Foundry Wave64", 0},
+  {"audio/x-wav", "WAV", 0},
+  {"audio/x-wavpack", "Wavpack", 0},
+  {"audio/x-wavpack-correction", "Wavpack", 0},
+  {"audio/x-wms", N_("Windows Media Speech"), 0},
+  {"audio/x-voxware", "Voxware", 0},
+
+
+  /* video formats with static descriptions */
+  {"video/sp5x", "Sunplus JPEG 5.x", 0},
+  {"video/vivo", "Vivo", 0},
+  {"video/x-3ivx", "3ivx", 0},
+  {"video/x-4xm", "4X Techologies Video", 0},
+  {"video/x-apple-video", "Apple video", 0},
+  {"video/x-camtasia", "TechSmith Camtasia", 0},
+  {"video/x-cdxa", "RIFF/CDXA (VCD)", 0},
+  {"video/x-cinepak", "Cinepak Video", 0},
+  {"video/x-cirrus-logic-accupak", "Cirrus Logipak AccuPak", 0},
+  {"video/x-compressed-yuv", N_("CYUV Lossless"), 0},
+  {"video/x-dirac", "Dirac", 0},
+  {"video/x-dvd-subpicture", "DVD subpicture", 0},
+  {"video/x-ffv", N_("FFMpeg v1"), 0},
+  {"video/x-flash-screen", "Flash Screen Video", 0},
+  {"video/x-flash-video", "Flash Video", 0},
+  {"video/x-h261", "H.261", 0},
+  {"video/x-huffyuv", "Huffyuv", 0},
+  {"video/x-intel-h263", "Intel H.263", 0},
+  {"video/x-jpeg", "Motion JPEG", 0},
+  /* { "video/x-jpeg-b", "", 0 }, does this actually exist? */
+  {"video/x-mjpeg", "Motion-JPEG", 0},
+  {"video/x-mjpeg-b", "Motion-JPEG format B", 0},
+  {"video/mpegts", "MPEG-2 Transport Stream", FLAG_CONTAINER},
+  {"video/x-mng", "Multiple Image Network Graphics (MNG)", 0},
+  {"video/x-mszh", N_("Lossless MSZH"), 0},
+  {"video/x-msvideocodec", "Microsoft Video 1", 0},
+  {"video/x-mve", "Interplay MVE", FLAG_CONTAINER},
+  {"video/x-nut", "NUT", FLAG_CONTAINER},
+  {"video/x-nuv", "MythTV NuppelVideo (NUV)", FLAG_CONTAINER},
+  {"video/x-qdrw", "Apple QuickDraw", 0},
+  {"video/x-raw-gray", N_("Uncompressed Gray Image"), 0},
+  {"video/x-smc", "Apple SMC", 0},
+  {"video/x-smoke", "Smoke", 0},
+  {"video/x-tarkin", "Tarkin", 0},
+  {"video/x-theora", "Theora", 0},
+  {"video/x-rle", N_("Run-length encoding"), 0},
+  {"video/x-ultimotion", "IBM UltiMotion", 0},
+  {"video/x-vcd", "VideoCD (VCD)", 0},
+  {"video/x-vmnc", "VMWare NC", 0},
+  {"video/x-vp3", "On2 VP3", 0},
+  {"video/x-vp5", "On2 VP5", 0},
+  {"video/x-vp6", "On2 VP6", 0},
+  {"video/x-vp6-flash", "On2 VP6/Flash", 0},
+  {"video/x-vp7", "On2 VP7", 0},
+  {"video/x-xvid", "XVID MPEG-4", 0},
+  {"video/x-zlib", "Lossless zlib video", 0},
+
+  /* image formats with static descriptions */
+  {"image/bmp", "BMP", 0},
+  {"image/x-bmp", "BMP", 0},
+  {"image/x-MS-bmp", "BMP", 0},
+  {"image/gif", "GIF", 0},
+  {"image/jpeg", "JPEG", 0},
+  {"image/jng", "JPEG Network Graphics (JNG)", 0},
+  {"image/png", "PNG", 0},
+  {"image/pbm", "PBM", 0},
+  {"image/ppm", "PPM", 0},
+  {"image/svg+xml", "Scalable Vector Graphics (SVG)", 0},
+  {"image/tiff", "TIFF", 0},
+  {"image/x-cmu-raster", "CMU Raster Format", 0},
+  {"image/x-icon", "ICO", 0},
+  {"image/x-xcf", "XFC", 0},
+  {"image/x-pixmap", "XPM", 0},
+  {"image/x-xpixmap", "XPM", 0},
+  {"image/x-quicktime", "QuickTime Image Format (QTIF)", 0},
+  {"image/x-sun-raster", "Sun Raster Format (RAS)", 0},
+  {"image/x-tga", "TGA", 0},
+
+  /* subtitle formats with static descriptions */
+  {"application/x-subtitle-sami", N_("Sami subtitle format"), 0},
+  {"application/x-subtitle-tmplayer", N_("TMPlayer subtitle format"), 0},
+  /* add variant field to typefinder? { "application/x-subtitle", N_("subtitle"), 0}, */
+
+  /* formats with dynamic descriptions */
+  {"audio/mpeg", NULL, 0},
+  {"audio/x-adpcm", NULL, 0},
+  {"audio/x-mace", NULL, 0},
+  {"audio/x-pn-realaudio", NULL, 0},
+  {"audio/x-raw-int", NULL, 0},
+  {"audio/x-raw-float", NULL, 0},
+  {"audio/x-wma", NULL, 0},
+  {"video/mpeg", NULL, FLAG_CONTAINER | FLAG_SYSTEMSTREAM},
+  {"video/mpeg", NULL, 0},
+  {"video/x-asus", NULL, 0},
+  {"video/x-ati-vcr", NULL, 0},
+  {"video/x-divx", NULL, 0},
+  {"video/x-dv", "Digital Video (DV) System Stream",
+      FLAG_CONTAINER | FLAG_SYSTEMSTREAM},
+  {"video/x-dv", "Digital Video (DV)", 0},
+  {"video/x-h263", NULL, 0},
+  {"video/x-h264", NULL, 0},
+  {"video/x-indeo", NULL, 0},
+  {"video/x-msmpeg", NULL, 0},
+  {"video/x-pn-realvideo", NULL, 0},
+#if 0
+  /* do these exist? are they used anywhere? */
+  {"video/x-pn-multirate-realvideo", NULL, 0},
+  {"audio/x-pn-multirate-realaudio", NULL, 0},
+  {"audio/x-pn-multirate-realaudio-live", NULL, 0},
+#endif
+  {"video/x-truemotion", NULL, 0},
+  {"video/x-raw-rgb", NULL, 0},
+  {"video/x-raw-yuv", NULL, 0},
+  {"video/x-svq", NULL, 0},
+  {"video/x-wmv", NULL, 0},
+  {"video/x-xan", NULL, 0}
+};
+
+/* returns static descriptions and dynamic ones (such as video/x-raw-yuv),
+ * or NULL if caps aren't known at all */
+static gchar *
+format_info_get_desc (const FormatInfo * info, const GstCaps * caps)
+{
+  const GstStructure *s;
+
+  g_assert (info != NULL);
+
+  if (info->desc != NULL)
+    return g_strdup (_(info->desc));
+
+  s = gst_caps_get_structure (caps, 0);
+
+  if (strcmp (info->type, "video/x-raw-yuv") == 0) {
+    const gchar *ret = NULL;
+    guint32 fourcc = 0;
+
+    gst_structure_get_fourcc (s, "format", &fourcc);
+    switch (fourcc) {
+      case GST_MAKE_FOURCC ('I', '4', '2', '0'):
+        ret = _("Uncompressed planar YUV 4:2:0");
+        break;
+      case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
+        ret = _("Uncompressed planar YVU 4:2:0");
+        break;
+      case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
+        ret = _("Uncompressed packed YUV 4:2:2");
+        break;
+      case GST_MAKE_FOURCC ('Y', 'U', 'V', '9'):
+        ret = _("Uncompressed packed YUV 4:1:0");
+        break;
+      case GST_MAKE_FOURCC ('Y', 'V', 'U', '9'):
+        ret = _("Uncompressed packed YVU 4:1:0");
+        break;
+      case GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'):
+      case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
+        ret = _("Uncompressed packed YUV 4:2:2");
+        break;
+      case GST_MAKE_FOURCC ('Y', '4', '1', 'P'):
+        ret = _("Uncompressed packed YUV 4:1:1");
+        break;
+      case GST_MAKE_FOURCC ('I', 'Y', 'U', '2'):
+        ret = _("Uncompressed packed YUV 4:4:4");
+        break;
+      case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
+        ret = _("Uncompressed planar YUV 4:2:2");
+        break;
+      case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
+        ret = _("Uncompressed planar YUV 4:1:1");
+        break;
+      case GST_MAKE_FOURCC ('Y', '8', '0', '0'):
+        ret = _("Uncompressed black and white Y-plane");
+        break;
+      default:
+        ret = _("Uncompressed YUV");
+        break;
+    }
+    return g_strdup (ret);
+  } else if (strcmp (info->type, "video/x-raw-rgb") == 0) {
+    const gchar *rgb_str;
+    gint depth = 0;
+
+    gst_structure_get_int (s, "depth", &depth);
+    rgb_str = gst_structure_has_field (s, "alpha_mask") ? "RGBA" : "RGB";
+    if (gst_structure_has_field (s, "paletted_data")) {
+      return g_strdup_printf (_("Uncompressed palettized %d-bit %s"), depth,
+          rgb_str);
+    } else {
+      return g_strdup_printf ("Uncompressed %d-bit %s", depth, rgb_str);
+    }
+  } else if (strcmp (info->type, "video/x-h263") == 0) {
+    const gchar *variant, *ret;
+
+    variant = gst_structure_get_string (s, "variant");
+    if (variant == NULL)
+      ret = "H.263";
+    else if (strcmp (variant, "itu") == 0)
+      ret = "ITU H.26n";        /* why not ITU H.263? (tpm) */
+    else if (strcmp (variant, "lead") == 0)
+      ret = "Lead H.263";
+    else if (strcmp (variant, "microsoft") == 0)
+      ret = "Microsoft H.263";
+    else if (strcmp (variant, "vdolive") == 0)
+      ret = "VDOLive";
+    else if (strcmp (variant, "vivo") == 0)
+      ret = "Vivo H.263";
+    else if (strcmp (variant, "xirlink") == 0)
+      ret = "Xirlink H.263";
+    else {
+      GST_WARNING ("Unknown H263 variant '%s'", variant);
+      ret = "H.263";
+    }
+    return g_strdup (ret);
+  } else if (strcmp (info->type, "video/x-h264") == 0) {
+    const gchar *variant, *ret;
+
+    variant = gst_structure_get_string (s, "variant");
+    if (variant == NULL)
+      ret = "H.264";
+    else if (strcmp (variant, "itu") == 0)
+      ret = "ITU H.264";
+    else if (strcmp (variant, "videosoft") == 0)
+      ret = "Videosoft H.264";
+    else {
+      GST_WARNING ("Unknown H264 variant '%s'", variant);
+      ret = "H.264";
+    }
+    return g_strdup (ret);
+  } else if (strcmp (info->type, "video/x-divx") == 0) {
+    gint ver = 0;
+
+    if (!gst_structure_get_int (s, "divxversion", &ver) || ver <= 2) {
+      GST_WARNING ("Unexpected DivX version in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("DivX MPEG-4");
+    }
+    return g_strdup_printf (_("DivX MPEG-4 Version %d"), ver);
+  } else if (strcmp (info->type, "video/x-msmpeg") == 0) {
+    gint ver = 0;
+
+    if (!gst_structure_get_int (s, "msmpegversion", &ver) ||
+        ver < 40 || ver > 49) {
+      GST_WARNING ("Unexpected msmpegversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("Microsoft MPEG-4 4.x");
+    }
+    return g_strdup_printf ("Microsoft MPEG-4 4.%d", ver % 10);
+  } else if (strcmp (info->type, "video/x-truemotion") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "trueversion", &ver);
+    switch (ver) {
+      case 1:
+        return g_strdup_printf ("Duck TrueMotion 1");
+      case 2:
+        return g_strdup_printf ("TrueMotion 2.0");
+      default:
+        GST_WARNING ("Unexpected trueversion in %" GST_PTR_FORMAT, caps);
+        break;
+    }
+    return g_strdup_printf ("TrueMotion");
+  } else if (strcmp (info->type, "video/x-xan") == 0) {
+    gint ver = 0;
+
+    if (!gst_structure_get_int (s, "wcversion", &ver) || ver < 1) {
+      GST_WARNING ("Unexpected wcversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("Xan Wing Commander");
+    }
+    return g_strdup_printf ("Xan Wing Commander %u", ver);
+  } else if (strcmp (info->type, "video/x-indeo") == 0) {
+    gint ver = 0;
+
+    if (!gst_structure_get_int (s, "indeoversion", &ver) || ver < 2) {
+      GST_WARNING ("Unexpected indeoversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("Intel Indeo");
+    }
+    return g_strdup_printf ("Intel Indeo %u", ver);
+  } else if (strcmp (info->type, "audio/x-wma") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "wmaversion", &ver);
+    switch (ver) {
+      case 1:
+      case 2:
+      case 3:
+        return g_strdup_printf ("Windows Media Audio %d", ver + 6);
+      default:
+        break;
+    }
+    GST_WARNING ("Unexpected wmaversion in %" GST_PTR_FORMAT, caps);
+    return g_strdup ("Windows Media Audio");
+  } else if (strcmp (info->type, "video/x-wmv") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "wmvversion", &ver);
+    switch (ver) {
+      case 1:
+      case 2:
+      case 3:
+        return g_strdup_printf ("Windows Media Video %d", ver + 6);
+      default:
+        break;
+    }
+    GST_WARNING ("Unexpected wmvversion in %" GST_PTR_FORMAT, caps);
+    return g_strdup ("Windows Media Video");
+  } else if (strcmp (info->type, "audio/x-mace") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "maceversion", &ver);
+    if (ver == 3 || ver == 6) {
+      return g_strdup_printf ("MACE-%d", ver);
+    } else {
+      GST_WARNING ("Unexpected maceversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("MACE");
+    }
+  } else if (strcmp (info->type, "video/x-svq") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "svqversion", &ver);
+    if (ver == 1 || ver == 3) {
+      return g_strdup_printf ("Sorensen Video %d", ver);
+    } else {
+      GST_WARNING ("Unexpected svqversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("Sorensen Video");
+    }
+  } else if (strcmp (info->type, "video/x-asus") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "asusversion", &ver);
+    if (ver == 1 || ver == 2) {
+      return g_strdup_printf ("Asus Video %d", ver);
+    } else {
+      GST_WARNING ("Unexpected asusversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("Asus Video");
+    }
+  } else if (strcmp (info->type, "video/x-ati-vcr") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "vcrversion", &ver);
+    if (ver == 1 || ver == 2) {
+      return g_strdup_printf ("ATI VCR %d", ver);
+    } else {
+      GST_WARNING ("Unexpected acrversion in %" GST_PTR_FORMAT, caps);
+      return g_strdup ("ATI VCR");
+    }
+  } else if (strcmp (info->type, "audio/x-adpcm") == 0) {
+    const GValue *layout_val;
+
+    layout_val = gst_structure_get_value (s, "layout");
+    if (layout_val != NULL && G_VALUE_HOLDS_STRING (layout_val)) {
+      const gchar *layout;
+
+      if ((layout = g_value_get_string (layout_val))) {
+        gchar *layout_upper, *ret;
+
+        if (strcmp (layout, "swf") == 0)
+          return g_strdup ("Shockwave ADPCM");
+        if (strcmp (layout, "microsoft") == 0)
+          return g_strdup ("Microsoft ADPCM");
+        if (strcmp (layout, "quicktime") == 0)
+          return g_strdup ("Quicktime ADPCM");
+        if (strcmp (layout, "westwood") == 0)
+          return g_strdup ("Westwood ADPCM");
+        if (strcmp (layout, "yamaha") == 0)
+          return g_strdup ("Yamaha ADPCM");
+        /* FIXME: other layouts: sbpro2, sbpro3, sbpro4, ct, g726, ea,
+         * adx, xa, 4xm, smjpeg, dk4, dk3, dvi */
+        layout_upper = g_ascii_strup (layout, -1);
+        ret = g_strdup_printf ("%s ADPCM", layout_upper);
+        g_free (layout_upper);
+        return ret;
+      }
+    }
+    return g_strdup ("ADPCM");
+  } else if (strcmp (info->type, "audio/mpeg") == 0) {
+    gint ver = 0, layer = 0;
+
+    gst_structure_get_int (s, "mpegversion", &ver);
+
+    switch (ver) {
+      case 1:
+        gst_structure_get_int (s, "layer", &layer);
+        switch (layer) {
+          case 1:
+          case 2:
+          case 3:
+            return g_strdup_printf ("MPEG-1 Layer %d (MP%d)", layer, layer);
+          default:
+            break;
+        }
+        GST_WARNING ("Unexpected MPEG-1 layer in %" GST_PTR_FORMAT, caps);
+        return g_strdup ("MPEG-1 Audio");
+      case 4:
+        return g_strdup ("MPEG-4 AAC");
+      default:
+        break;
+    }
+    GST_WARNING ("Unexpected audio mpegversion in %" GST_PTR_FORMAT, caps);
+    return g_strdup ("MPEG Audio");
+  } else if (strcmp (info->type, "audio/x-pn-realaudio") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "raversion", &ver);
+    switch (ver) {
+      case 1:
+        return g_strdup ("RealAudio 14k4bps");
+      case 2:
+        return g_strdup ("RealAudio 28k8bps");
+      case 8:
+        return g_strdup ("RealAudio G2 (Cook)");
+      default:
+        break;
+    }
+    GST_WARNING ("Unexpected raversion in %" GST_PTR_FORMAT, caps);
+    return g_strdup ("RealAudio");
+  } else if (strcmp (info->type, "video/x-pn-realvideo") == 0) {
+    gint ver = 0;
+
+    gst_structure_get_int (s, "rmversion", &ver);
+    switch (ver) {
+      case 1:
+        return g_strdup ("RealVideo 1.0");
+      case 2:
+        return g_strdup ("RealVideo 2.0");
+      case 3:
+        return g_strdup ("RealVideo 3.0");
+      case 4:
+        return g_strdup ("RealVideo 4.0");
+      default:
+        break;
+    }
+    GST_WARNING ("Unexpected rmversion in %" GST_PTR_FORMAT, caps);
+    return g_strdup ("RealVideo");
+  } else if (strcmp (info->type, "video/mpeg") == 0) {
+    gboolean sysstream;
+    gint ver = 0;
+
+    if (!gst_structure_get_boolean (s, "systemstream", &sysstream) ||
+        !gst_structure_get_int (s, "mpegversion", &ver) || ver < 1 || ver > 4) {
+      GST_WARNING ("Missing fields in mpeg video caps %" GST_PTR_FORMAT, caps);
+    } else {
+      if (sysstream) {
+        return g_strdup_printf ("MPEG-%d System Stream", ver);
+      } else {
+        return g_strdup_printf ("MPEG-%d Video", ver);
+      }
+    }
+    return g_strdup ("MPEG Video");
+  } else if (strcmp (info->type, "audio/x-raw-int") == 0) {
+    gint bitdepth = 0;
+
+    /* 8-bit pcm might not have depth field (?) */
+    if (!gst_structure_get_int (s, "depth", &bitdepth))
+      gst_structure_get_int (s, "width", &bitdepth);
+    if (bitdepth != 0)
+      return g_strdup_printf (_("Raw %d-bit PCM audio"), bitdepth);
+    else
+      return g_strdup (_("Raw PCM audio"));
+  } else if (strcmp (info->type, "audio/x-raw-float") == 0) {
+    gint bitdepth = 0;
+
+    gst_structure_get_int (s, "width", &bitdepth);
+    if (bitdepth != 0)
+      return g_strdup_printf (_("Raw %d-bit floating-point audio"), bitdepth);
+    else
+      return g_strdup (_("Raw floating-point audio"));
+  }
+
+  return NULL;
+}
+
+/* returns format info structure, will return NULL for dynamic media types! */
+static const FormatInfo *
+find_format_info (const GstCaps * caps)
+{
+  const GstStructure *s;
+  const gchar *media_type;
+  guint i;
+
+  s = gst_caps_get_structure (caps, 0);
+  media_type = gst_structure_get_name (s);
+
+  for (i = 0; i < G_N_ELEMENTS (formats); ++i) {
+    if (strcmp (media_type, formats[i].type) == 0) {
+      gboolean is_sys = FALSE;
+
+      if ((formats[i].flags & FLAG_SYSTEMSTREAM) == 0)
+        return &formats[i];
+
+      /* this record should only be matched if the systemstream field is set */
+      if (gst_structure_get_boolean (s, "systemstream", &is_sys) && is_sys)
+        return &formats[i];
+    }
+  }
+
+  return NULL;
+}
+
+static gboolean
+caps_are_rtp_caps (const GstCaps * caps, const gchar * media, gchar ** format)
+{
+  const GstStructure *s;
+  const gchar *str;
+
+  g_assert (media != NULL && format != NULL);
+
+  s = gst_caps_get_structure (caps, 0);
+  if (!gst_structure_has_name (s, "application/x-rtp"))
+    return FALSE;
+  if (!gst_structure_has_field_typed (s, "media", G_TYPE_STRING))
+    return FALSE;
+  str = gst_structure_get_string (s, "media");
+  if (str == NULL || !g_str_equal (str, media))
+    return FALSE;
+  str = gst_structure_get_string (s, "encoding-name");
+  if (str == NULL || *str == '\0')
+    return FALSE;
+
+  if (strcmp (str, "X-ASF-PF") == 0) {
+    *format = g_strdup ("Windows Media");
+  } else if (g_str_has_prefix (str, "X-")) {
+    *format = g_strdup (str + 2);
+  } else {
+    *format = g_strdup (str);
+  }
+
+  return TRUE;
+}
+
+/**
+ * gst_pb_utils_get_source_description:
+ * @protocol: the protocol the source element needs to handle, e.g. "http"
+ *
+ * Returns a localised string describing a source element handling the protocol
+ * specified in @protocol, for use in error dialogs or other messages to be
+ * seen by the user. Should never return NULL unless @protocol is invalid.
+ *
+ * This function is mainly for internal use, applications would typically
+ * use gst_missing_plugin_message_get_description() to get a description of
+ * a missing feature from a missing-plugin message.
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_source_description (const gchar * protocol)
+{
+  gchar *proto_uc, *ret;
+
+  g_return_val_if_fail (protocol != NULL, NULL);
+
+  if (strcmp (protocol, "cdda") == 0)
+    return g_strdup (_("Audio CD source"));
+
+  if (strcmp (protocol, "dvd") == 0)
+    return g_strdup (_("DVD source"));
+
+  if (strcmp (protocol, "rtsp") == 0)
+    return g_strdup (_("Real Time Streaming Protocol (RTSP) source"));
+
+  /* TODO: what about mmst, mmsu, mmsh? */
+  if (strcmp (protocol, "mms") == 0)
+    return g_strdup (_("Microsoft Media Server (MMS) protocol source"));
+
+  /* make protocol uppercase */
+  proto_uc = g_ascii_strup (protocol, -1);
+
+  /* TODO: find out how to add a comment for translators to the source code
+   * (and tell them to make the first letter uppercase below if they move
+   * the protocol to the middle or end of the string) */
+  ret = g_strdup_printf (_("%s protocol source"), proto_uc);
+
+  g_free (proto_uc);
+
+  return ret;
+}
+
+/**
+ * gst_pb_utils_get_sink_description:
+ * @protocol: the protocol the sink element needs to handle, e.g. "http"
+ *
+ * Returns a localised string describing a sink element handling the protocol
+ * specified in @protocol, for use in error dialogs or other messages to be
+ * seen by the user. Should never return NULL unless @protocol is invalid.
+ *
+ * This function is mainly for internal use, applications would typically
+ * use gst_missing_plugin_message_get_description() to get a description of
+ * a missing feature from a missing-plugin message.
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_sink_description (const gchar * protocol)
+{
+  gchar *proto_uc, *ret;
+
+  g_return_val_if_fail (protocol != NULL, NULL);
+
+  /* make protocol uppercase */
+  proto_uc = g_ascii_strup (protocol, -1);
+
+  /* TODO: find out how to add a comment for translators to the source code
+   * (and tell them to make the first letter uppercase below if they move
+   * the protocol to the middle or end of the string) */
+  ret = g_strdup_printf ("%s protocol sink", proto_uc);
+
+  g_free (proto_uc);
+
+  return ret;
+}
+
+/**
+ * gst_pb_utils_get_decoder_description:
+ * @caps: the (fixed) #GstCaps for which an decoder description is needed
+ *
+ * Returns a localised string describing an decoder for the format specified
+ * in @caps, for use in error dialogs or other messages to be seen by the user.
+ * Should never return NULL unless @factory_name or @caps are invalid.
+ *
+ * This function is mainly for internal use, applications would typically
+ * use gst_missing_plugin_message_get_description() to get a description of
+ * a missing feature from a missing-plugin message.
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_decoder_description (const GstCaps * caps)
+{
+  gchar *str, *ret;
+
+  g_return_val_if_fail (caps != NULL, NULL);
+  g_return_val_if_fail (GST_IS_CAPS (caps), NULL);
+  g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
+
+  /* special-case RTP caps */
+  if (caps_are_rtp_caps (caps, "video", &str)) {
+    ret = g_strdup_printf (_("%s video RTP depayloader"), str);
+  } else if (caps_are_rtp_caps (caps, "audio", &str)) {
+    ret = g_strdup_printf (_("%s audio RTP depayloader"), str);
+  } else if (caps_are_rtp_caps (caps, "application", &str)) {
+    ret = g_strdup_printf (_("%s RTP depayloader"), str);
+  } else {
+    const FormatInfo *info;
+
+    str = gst_pb_utils_get_codec_description (caps);
+    info = find_format_info (caps);
+    if (info != NULL && (info->flags & FLAG_CONTAINER) != 0) {
+      ret = g_strdup_printf (_("%s demuxer"), str);
+    } else {
+      ret = g_strdup_printf (_("%s decoder"), str);
+    }
+  }
+
+  g_free (str);
+
+  return ret;
+}
+
+/**
+ * gst_pb_utils_get_encoder_description:
+ * @caps: the (fixed) #GstCaps for which an encoder description is needed
+ *
+ * Returns a localised string describing an encoder for the format specified
+ * in @caps, for use in error dialogs or other messages to be seen by the user.
+ * Should never return NULL unless @factory_name or @caps are invalid.
+ *
+ * This function is mainly for internal use, applications would typically
+ * use gst_missing_plugin_message_get_description() to get a description of
+ * a missing feature from a missing-plugin message.
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_encoder_description (const GstCaps * caps)
+{
+  gchar *str, *ret;
+
+  g_return_val_if_fail (caps != NULL, NULL);
+  g_return_val_if_fail (GST_IS_CAPS (caps), NULL);
+  g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
+
+  /* special-case RTP caps */
+  if (caps_are_rtp_caps (caps, "video", &str)) {
+    ret = g_strdup_printf (_("%s video RTP payloader"), str);
+  } else if (caps_are_rtp_caps (caps, "audio", &str)) {
+    ret = g_strdup_printf (_("%s audio RTP payloader"), str);
+  } else if (caps_are_rtp_caps (caps, "application", &str)) {
+    ret = g_strdup_printf (_("%s RTP payloader"), str);
+  } else {
+    const FormatInfo *info;
+
+    str = gst_pb_utils_get_codec_description (caps);
+    info = find_format_info (caps);
+    if (info != NULL && (info->flags & FLAG_CONTAINER) != 0) {
+      ret = g_strdup_printf (_("%s muxer"), str);
+    } else {
+      ret = g_strdup_printf (_("%s encoder"), str);
+    }
+  }
+
+  g_free (str);
+
+  return ret;
+}
+
+/**
+ * gst_pb_utils_get_element_description:
+ * @factory_name: the name of the element, e.g. "gnomevfssrc"
+ *
+ * Returns a localised string describing the given element, for use in
+ * error dialogs or other messages to be seen by the user. Should never
+ * return NULL unless @factory_name is invalid.
+ *
+ * This function is mainly for internal use, applications would typically
+ * use gst_missing_plugin_message_get_description() to get a description of
+ * a missing feature from a missing-plugin message.
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_element_description (const gchar * factory_name)
+{
+  gchar *ret;
+
+  g_return_val_if_fail (factory_name != NULL, NULL);
+
+  ret = g_strdup_printf (_("GStreamer element %s"), factory_name);
+  if (ret && g_str_has_prefix (ret, factory_name))
+    *ret = g_ascii_toupper (*ret);
+
+  return ret;
+}
+
+/**
+ * gst_pb_utils_add_codec_description_to_tag_list:
+ * @taglist: a #GstTagList
+ * @codec_tag: a GStreamer codec tag such as #GST_TAG_AUDIO_CODEC,
+ *             #GST_TAG_VIDEO_CODEC or #GST_TAG_CODEC
+ * @caps: the (fixed) #GstCaps for which a codec tag should be added.
+ *
+ * Adds a codec tag describing the format specified by @caps to @taglist.
+ *
+ * Returns: TRUE if a codec tag was added, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pb_utils_add_codec_description_to_tag_list (GstTagList * taglist,
+    const gchar * codec_tag, const GstCaps * caps)
+{
+  const FormatInfo *info;
+  gchar *desc;
+
+  g_return_val_if_fail (taglist != NULL, FALSE);
+  g_return_val_if_fail (GST_IS_TAG_LIST (taglist), FALSE);
+  g_return_val_if_fail (codec_tag != NULL, FALSE);
+  g_return_val_if_fail (gst_tag_exists (codec_tag), FALSE);
+  g_return_val_if_fail (gst_tag_get_type (codec_tag) == G_TYPE_STRING, FALSE);
+  g_return_val_if_fail (caps != NULL, FALSE);
+  g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
+
+  info = find_format_info (caps);
+  if (info == NULL)
+    return FALSE;
+
+  desc = format_info_get_desc (info, caps);
+  gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, codec_tag, desc, NULL);
+  g_free (desc);
+
+  return TRUE;
+}
+
+/**
+ * gst_pb_utils_get_codec_description:
+ * @caps: the (fixed) #GstCaps for which an format description is needed
+ *
+ * Returns a localised (as far as this is possible) string describing the
+ * media format specified in @caps, for use in error dialogs or other messages
+ * to be seen by the user. Should never return NULL unless @caps is invalid.
+ *
+ * Also see the convenience function
+ * gst_pb_utils_add_codec_description_to_tag_list().
+ *
+ * Returns: a newly-allocated description string, or NULL on error. Free
+ *          string with g_free() when not needed any longer.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gchar *
+gst_pb_utils_get_codec_description (const GstCaps * caps)
+{
+  const FormatInfo *info;
+  gchar *str, *comma;
+
+  g_return_val_if_fail (caps != NULL, NULL);
+  g_return_val_if_fail (GST_IS_CAPS (caps), NULL);
+  g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
+
+  info = find_format_info (caps);
+
+  if (info) {
+    str = format_info_get_desc (info, caps);
+  } else {
+    str = gst_caps_to_string (caps);
+
+    /* cut off everything after the media type, if there is anything */
+    if ((comma = strchr (str, ','))) {
+      *comma = '\0';
+      g_strchomp (str);
+      /* we could do something more elaborate here, like taking into account
+       * audio/, video/, image/ and application/ prefixes etc. */
+    }
+
+    GST_WARNING ("No description available for media type: %s", str);
+  }
+
+  return str;
+}
+
+#if 0
+void
+gst_pb_utils_list_all (void)
+{
+  gint i;
+
+  g_print ("static const gchar *caps_strings[] = { ");
+
+  for (i = 0; i < G_N_ELEMENTS (formats); ++i) {
+    if (formats[i].desc != NULL)
+      g_print ("  \"%s\", ", formats[i].type);
+  }
+  g_print ("\n#if 0\n");
+  for (i = 0; i < G_N_ELEMENTS (formats); ++i) {
+    if (formats[i].desc == NULL)
+      g_print ("  \"%s\", \n", formats[i].type);
+  }
+  g_print ("\n#endif\n");
+}
+#endif