Moving twolame mp2 encoder plugin from -ugly

https://bugzilla.gnome.org/show_bug.cgi?id=774252

4 files changed, 1004 insertions, 0 deletions

diff --git a/ext/twolame/Makefile.am b/ext/twolame/Makefile.am
new file mode 100644
index 000000000..362ee20f6
--- /dev/null
+++ b/ext/twolame/Makefile.am
@@ -0,0 +1,11 @@
+plugin_LTLIBRARIES = libgsttwolame.la
+
+libgsttwolame_la_SOURCES = gsttwolamemp2enc.c
+libgsttwolame_la_CFLAGS = \
+	$(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(TWOLAME_CFLAGS)
+libgsttwolame_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) \
+	-lgstaudio-@GST_API_VERSION@ -lgstpbutils-@GST_API_VERSION@ \
+	$(GST_LIBS) $(TWOLAME_LIBS)
+libgsttwolame_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+
+noinst_HEADERS = gsttwolamemp2enc.h
diff --git a/ext/twolame/gsttwolamemp2enc.c b/ext/twolame/gsttwolamemp2enc.c
new file mode 100644
index 000000000..31bec6b78
--- /dev/null
+++ b/ext/twolame/gsttwolamemp2enc.c
@@ -0,0 +1,893 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2004> Wim Taymans <wim@fluendo.com>
+ * Copyright (C) <2005> Thomas Vander Stichele <thomas at apestaart dot org>
+ * Copyright (C) <2008> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+
+/*
+ * Based on the lame element.
+ */
+
+/**
+ * SECTION:element-twolame
+ * @see_also: mad, lame
+ *
+ * This element encodes raw integer audio into an MPEG-1 layer 2 (MP2) stream.
+ *
+ * <refsect2>
+ * <title>Example pipelines</title>
+ * |[
+ * gst-launch-1.0 -v audiotestsrc wave=sine num-buffers=100 ! audioconvert ! twolame ! filesink location=sine.mp2
+ * ]| Encode a test sine signal to MP2.
+ * |[
+ * gst-launch-1.0 -v alsasrc ! audioconvert ! twolame bitrate=192 ! filesink location=alsasrc.mp2
+ * ]| Record from a sound card using ALSA and encode to MP2
+ * |[
+ * gst-launch-1.0 -v filesrc location=music.wav ! decodebin ! audioconvert ! audioresample ! twolame bitrate=192 ! id3v2mux ! filesink location=music.mp2
+ * ]| Transcode from a .wav file to MP2 (the id3v2mux element is optional)
+ * |[
+ * gst-launch-1.0 -v cdda://5 ! audioconvert ! twolame bitrate=192 ! filesink location=track5.mp2
+ * ]| Encode Audio CD track 5 to MP2
+ * </refsect2>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "string.h"
+#include "gsttwolamemp2enc.h"
+#include "gst/gst-i18n-plugin.h"
+
+GST_DEBUG_CATEGORY_STATIC (debug);
+#define GST_CAT_DEFAULT debug
+
+/* TwoLAME can do MPEG-1, MPEG-2 so it has 6 possible
+ * sample rates it supports */
+static GstStaticPadTemplate gst_two_lame_sink_template =
+    GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-raw, "
+        "format = (string) { " GST_AUDIO_NE (F32) ", " GST_AUDIO_NE (S16) " }, "
+        "layout = (string) interleaved, "
+        "rate = (int) { 16000, 22050, 24000, 32000, 44100, 48000 }, "
+        "channels = (int) 1; "
+        "audio/x-raw, "
+        "format = (string) { " GST_AUDIO_NE (F32) ", " GST_AUDIO_NE (S16) " }, "
+        "layout = (string) interleaved, "
+        "rate = (int) { 16000, 22050, 24000, 32000, 44100, 48000 }, "
+        "channels = (int) 2," "channel-mask = (bitmask) 0x3")
+    );
+
+static GstStaticPadTemplate gst_two_lame_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/mpeg, "
+        "mpegversion = (int) 1, "
+        "layer = (int) 2, "
+        "rate = (int) { 16000, 22050, 24000, 32000, 44100, 48000 }, "
+        "channels = (int) [ 1, 2 ]")
+    );
+
+static struct
+{
+  gint mode;
+  gint psymodel;
+  gint bitrate;
+  gint padding;
+  gboolean energy_level_extension;
+  gint emphasis;
+  gboolean error_protection;
+  gboolean copyright;
+  gboolean original;
+  gboolean vbr;
+  gfloat vbr_level;
+  gfloat ath_level;
+  gint vbr_max_bitrate;
+  gboolean quick_mode;
+  gint quick_mode_count;
+} gst_two_lame_default_settings;
+
+/********** Define useful types for non-programmatic interfaces **********/
+#define GST_TYPE_TWO_LAME_MODE (gst_two_lame_mode_get_type())
+static GType
+gst_two_lame_mode_get_type (void)
+{
+  static GType two_lame_mode_type = 0;
+  static const GEnumValue two_lame_modes[] = {
+    {TWOLAME_AUTO_MODE, "Auto", "auto"},
+    {TWOLAME_STEREO, "Stereo", "stereo"},
+    {TWOLAME_JOINT_STEREO, "Joint Stereo", "joint"},
+    {TWOLAME_DUAL_CHANNEL, "Dual Channel", "dual"},
+    {TWOLAME_MONO, "Mono", "mono"},
+    {0, NULL, NULL}
+  };
+
+  if (!two_lame_mode_type) {
+    two_lame_mode_type =
+        g_enum_register_static ("GstTwoLameMode", two_lame_modes);
+  }
+  return two_lame_mode_type;
+}
+
+#define GST_TYPE_TWO_LAME_PADDING (gst_two_lame_padding_get_type())
+static GType
+gst_two_lame_padding_get_type (void)
+{
+  static GType two_lame_padding_type = 0;
+  static const GEnumValue two_lame_padding[] = {
+    {TWOLAME_PAD_NO, "No Padding", "never"},
+    {TWOLAME_PAD_ALL, "Always Pad", "always"},
+    {0, NULL, NULL}
+  };
+
+  if (!two_lame_padding_type) {
+    two_lame_padding_type =
+        g_enum_register_static ("GstTwoLamePadding", two_lame_padding);
+  }
+  return two_lame_padding_type;
+}
+
+#define GST_TYPE_TWO_LAME_EMPHASIS (gst_two_lame_emphasis_get_type())
+static GType
+gst_two_lame_emphasis_get_type (void)
+{
+  static GType two_lame_emphasis_type = 0;
+  static const GEnumValue two_lame_emphasis[] = {
+    {TWOLAME_EMPHASIS_N, "No emphasis", "none"},
+    {TWOLAME_EMPHASIS_5, "50/15 ms", "5"},
+    {TWOLAME_EMPHASIS_C, "CCIT J.17", "ccit"},
+    {0, NULL, NULL}
+  };
+
+  if (!two_lame_emphasis_type) {
+    two_lame_emphasis_type =
+        g_enum_register_static ("GstTwoLameEmphasis", two_lame_emphasis);
+  }
+
+  return two_lame_emphasis_type;
+}
+
+/********** Standard stuff for signals and arguments **********/
+
+enum
+{
+  ARG_0,
+  ARG_MODE,
+  ARG_PSYMODEL,
+  ARG_BITRATE,
+  ARG_PADDING,
+  ARG_ENERGY_LEVEL_EXTENSION,
+  ARG_EMPHASIS,
+  ARG_ERROR_PROTECTION,
+  ARG_COPYRIGHT,
+  ARG_ORIGINAL,
+  ARG_VBR,
+  ARG_VBR_LEVEL,
+  ARG_ATH_LEVEL,
+  ARG_VBR_MAX_BITRATE,
+  ARG_QUICK_MODE,
+  ARG_QUICK_MODE_COUNT
+};
+
+static gboolean gst_two_lame_start (GstAudioEncoder * enc);
+static gboolean gst_two_lame_stop (GstAudioEncoder * enc);
+static gboolean gst_two_lame_set_format (GstAudioEncoder * enc,
+    GstAudioInfo * info);
+static GstFlowReturn gst_two_lame_handle_frame (GstAudioEncoder * enc,
+    GstBuffer * in_buf);
+static void gst_two_lame_flush (GstAudioEncoder * enc);
+
+static void gst_two_lame_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_two_lame_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static gboolean gst_two_lame_setup (GstTwoLame * twolame);
+
+G_DEFINE_TYPE (GstTwoLame, gst_two_lame, GST_TYPE_AUDIO_ENCODER);
+
+static void
+gst_two_lame_release_memory (GstTwoLame * twolame)
+{
+  if (twolame->glopts) {
+    twolame_close (&twolame->glopts);
+    twolame->glopts = NULL;
+  }
+}
+
+static void
+gst_two_lame_finalize (GObject * obj)
+{
+  gst_two_lame_release_memory (GST_TWO_LAME (obj));
+
+  G_OBJECT_CLASS (gst_two_lame_parent_class)->finalize (obj);
+}
+
+static void
+gst_two_lame_class_init (GstTwoLameClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstAudioEncoderClass *gstbase_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstbase_class = (GstAudioEncoderClass *) klass;
+
+  gobject_class->set_property = gst_two_lame_set_property;
+  gobject_class->get_property = gst_two_lame_get_property;
+  gobject_class->finalize = gst_two_lame_finalize;
+
+  gstbase_class->start = GST_DEBUG_FUNCPTR (gst_two_lame_start);
+  gstbase_class->stop = GST_DEBUG_FUNCPTR (gst_two_lame_stop);
+  gstbase_class->set_format = GST_DEBUG_FUNCPTR (gst_two_lame_set_format);
+  gstbase_class->handle_frame = GST_DEBUG_FUNCPTR (gst_two_lame_handle_frame);
+  gstbase_class->flush = GST_DEBUG_FUNCPTR (gst_two_lame_flush);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MODE,
+      g_param_spec_enum ("mode", "Mode", "Encoding mode",
+          GST_TYPE_TWO_LAME_MODE, gst_two_lame_default_settings.mode,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PSYMODEL,
+      g_param_spec_int ("psymodel", "Psychoacoustic Model",
+          "Psychoacoustic model used to encode the audio",
+          -1, 4, gst_two_lame_default_settings.psymodel,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BITRATE,
+      g_param_spec_int ("bitrate", "Bitrate (kb/s)",
+          "Bitrate in kbit/sec (8, 16, 24, 32, 40, 48, 56, 64, 80, 96, "
+          "112, 128, 144, 160, 192, 224, 256, 320, 384)",
+          8, 384, gst_two_lame_default_settings.bitrate,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PADDING,
+      g_param_spec_enum ("padding", "Padding", "Padding type",
+          GST_TYPE_TWO_LAME_PADDING, gst_two_lame_default_settings.padding,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass),
+      ARG_ENERGY_LEVEL_EXTENSION,
+      g_param_spec_boolean ("energy-level-extension", "Energy Level Extension",
+          "Write peak PCM level to each frame",
+          gst_two_lame_default_settings.energy_level_extension,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_EMPHASIS,
+      g_param_spec_enum ("emphasis", "Emphasis",
+          "Pre-emphasis to apply to the decoded audio",
+          GST_TYPE_TWO_LAME_EMPHASIS, gst_two_lame_default_settings.emphasis,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ERROR_PROTECTION,
+      g_param_spec_boolean ("error-protection", "Error protection",
+          "Adds checksum to every frame",
+          gst_two_lame_default_settings.error_protection,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_COPYRIGHT,
+      g_param_spec_boolean ("copyright", "Copyright", "Mark as copyright",
+          gst_two_lame_default_settings.copyright,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ORIGINAL,
+      g_param_spec_boolean ("original", "Original", "Mark as original",
+          gst_two_lame_default_settings.original,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_VBR,
+      g_param_spec_boolean ("vbr", "VBR", "Enable variable bitrate mode",
+          gst_two_lame_default_settings.vbr,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_VBR_LEVEL,
+      g_param_spec_float ("vbr-level", "VBR Level", "VBR Level",
+          -10.0, 10.0, gst_two_lame_default_settings.vbr_level,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ATH_LEVEL,
+      g_param_spec_float ("ath-level", "ATH Level", "ATH Level in dB",
+          -G_MAXFLOAT, G_MAXFLOAT, gst_two_lame_default_settings.ath_level,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_VBR_MAX_BITRATE,
+      g_param_spec_int ("vbr-max-bitrate", "VBR max bitrate",
+          "Specify maximum VBR bitrate (0=off, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, "
+          "112, 128, 144, 160, 192, 224, 256, 320, 384)",
+          0, 384, gst_two_lame_default_settings.vbr_max_bitrate,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUICK_MODE,
+      g_param_spec_boolean ("quick-mode", "Quick mode",
+          "Calculate Psymodel every frames",
+          gst_two_lame_default_settings.quick_mode,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUICK_MODE_COUNT,
+      g_param_spec_int ("quick-mode-count", "Quick mode count",
+          "Calculate Psymodel every n frames",
+          0, G_MAXINT, gst_two_lame_default_settings.quick_mode_count,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
+      &gst_two_lame_src_template);
+  gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
+      &gst_two_lame_sink_template);
+
+  gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
+      "TwoLAME mp2 encoder", "Codec/Encoder/Audio",
+      "High-quality free MP2 encoder",
+      "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
+}
+
+static gboolean
+gst_two_lame_set_format (GstAudioEncoder * enc, GstAudioInfo * info)
+{
+  GstTwoLame *twolame;
+  gint out_samplerate;
+  gint version;
+  GstCaps *othercaps;
+
+  twolame = GST_TWO_LAME (enc);
+
+  /* parameters already parsed for us */
+  twolame->samplerate = GST_AUDIO_INFO_RATE (info);
+  twolame->num_channels = GST_AUDIO_INFO_CHANNELS (info);
+  twolame->float_input = !GST_AUDIO_INFO_IS_INTEGER (info);
+
+  /* but we might be asked to reconfigure, so reset */
+  gst_two_lame_release_memory (twolame);
+
+  GST_DEBUG_OBJECT (twolame, "setting up twolame");
+  if (!gst_two_lame_setup (twolame))
+    goto setup_failed;
+
+  out_samplerate = twolame_get_out_samplerate (twolame->glopts);
+  if (out_samplerate == 0)
+    goto zero_output_rate;
+
+  if (out_samplerate != twolame->samplerate) {
+    GST_WARNING_OBJECT (twolame,
+        "output samplerate %d is different from incoming samplerate %d",
+        out_samplerate, twolame->samplerate);
+  }
+
+  version = twolame_get_version (twolame->glopts);
+  if (version == TWOLAME_MPEG2)
+    version = 2;
+  else
+    version = 1;
+
+  othercaps =
+      gst_caps_new_simple ("audio/mpeg",
+      "mpegversion", G_TYPE_INT, 1,
+      "mpegaudioversion", G_TYPE_INT, version,
+      "layer", G_TYPE_INT, 2,
+      "channels", G_TYPE_INT,
+      twolame->mode == TWOLAME_MONO ? 1 : twolame->num_channels, "rate",
+      G_TYPE_INT, out_samplerate, NULL);
+
+  /* and use these caps */
+  gst_audio_encoder_set_output_format (GST_AUDIO_ENCODER (twolame), othercaps);
+  gst_caps_unref (othercaps);
+
+  /* report needs to base class:
+   * hand one frame at a time, if we are pretty sure what a frame is */
+  if (out_samplerate == twolame->samplerate) {
+    gst_audio_encoder_set_frame_samples_min (enc, 1152);
+    gst_audio_encoder_set_frame_samples_max (enc, 1152);
+    gst_audio_encoder_set_frame_max (enc, 1);
+  }
+
+  return TRUE;
+
+zero_output_rate:
+  {
+    GST_ELEMENT_ERROR (twolame, LIBRARY, SETTINGS, (NULL),
+        ("TwoLAME decided on a zero sample rate"));
+    return FALSE;
+  }
+setup_failed:
+  {
+    GST_ELEMENT_ERROR (twolame, LIBRARY, SETTINGS,
+        (_("Failed to configure TwoLAME encoder. Check your encoding parameters.")), (NULL));
+    return FALSE;
+  }
+}
+
+static void
+gst_two_lame_init (GstTwoLame * twolame)
+{
+  GST_DEBUG_OBJECT (twolame, "starting initialization");
+
+  GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_ENCODER_SINK_PAD (twolame));
+
+  twolame->mode = gst_two_lame_default_settings.mode;
+  twolame->psymodel = gst_two_lame_default_settings.psymodel;
+  twolame->bitrate = gst_two_lame_default_settings.bitrate;
+  twolame->padding = gst_two_lame_default_settings.padding;
+  twolame->energy_level_extension =
+      gst_two_lame_default_settings.energy_level_extension;
+  twolame->emphasis = gst_two_lame_default_settings.emphasis;
+  twolame->error_protection = gst_two_lame_default_settings.error_protection;
+  twolame->copyright = gst_two_lame_default_settings.copyright;
+  twolame->original = gst_two_lame_default_settings.original;
+  twolame->vbr = gst_two_lame_default_settings.vbr;
+  twolame->vbr_level = gst_two_lame_default_settings.vbr_level;
+  twolame->ath_level = gst_two_lame_default_settings.ath_level;
+  twolame->vbr_max_bitrate = gst_two_lame_default_settings.vbr_max_bitrate;
+  twolame->quick_mode = gst_two_lame_default_settings.quick_mode;
+  twolame->quick_mode_count = gst_two_lame_default_settings.quick_mode_count;
+
+  GST_DEBUG_OBJECT (twolame, "done initializing");
+}
+
+static gboolean
+gst_two_lame_start (GstAudioEncoder * enc)
+{
+  GstTwoLame *twolame = GST_TWO_LAME (enc);
+
+  GST_DEBUG_OBJECT (twolame, "start");
+  return TRUE;
+}
+
+static gboolean
+gst_two_lame_stop (GstAudioEncoder * enc)
+{
+  GstTwoLame *twolame = GST_TWO_LAME (enc);
+
+  GST_DEBUG_OBJECT (twolame, "stop");
+
+  gst_two_lame_release_memory (twolame);
+  return TRUE;
+}
+
+/* <php-emulation-mode>three underscores for ___rate is really really really
+ * private as opposed to one underscore<php-emulation-mode> */
+/* call this MACRO outside of the NULL state so that we have a higher chance
+ * of actually having a pipeline and bus to get the message through */
+
+#define CHECK_AND_FIXUP_BITRATE(obj,param,rate)         		  \
+G_STMT_START {                                                            \
+  gint ___rate = rate;                                                    \
+  gint maxrate = 320;							  \
+  gint multiplier = 64;							  \
+  if (rate <= 64) {							  \
+    maxrate = 64; multiplier = 8;                                         \
+    if ((rate % 8) != 0) ___rate = GST_ROUND_UP_8 (rate); 		  \
+  } else if (rate <= 144) {						  \
+    maxrate = 144; multiplier = 16;                                       \
+    if ((rate % 16) != 0) ___rate = GST_ROUND_UP_16 (rate);               \
+  } else if (rate <= 256) {						  \
+    maxrate = 256; multiplier = 32;                                       \
+    if ((rate % 32) != 0) ___rate = GST_ROUND_UP_32 (rate);               \
+  } else if (rate <= 384) { 						  \
+    maxrate = 384; multiplier = 64;                                       \
+    if ((rate % 64) != 0) ___rate = GST_ROUND_UP_64 (rate);               \
+  }                                                                       \
+  if (___rate != rate) {                                                  \
+    GST_ELEMENT_WARNING (obj, LIBRARY, SETTINGS,			  \
+        (_("The requested bitrate %d kbit/s for property '%s' "           \
+           "is not allowed. "  					          \
+           "The bitrate was changed to %d kbit/s."), rate,		  \
+         param,  ___rate), 					          \
+        ("A bitrate below %d should be a multiple of %d.", 		  \
+            maxrate, multiplier));		  			  \
+    rate = ___rate;                                                       \
+  }                                                                       \
+} G_STMT_END
+
+static void
+gst_two_lame_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstTwoLame *twolame = GST_TWO_LAME (object);
+
+  switch (prop_id) {
+    case ARG_MODE:
+      twolame->mode = g_value_get_enum (value);
+      break;
+    case ARG_PSYMODEL:
+      twolame->psymodel = g_value_get_int (value);
+      break;
+    case ARG_BITRATE:
+      twolame->bitrate = g_value_get_int (value);
+      break;
+    case ARG_PADDING:
+      twolame->padding = g_value_get_enum (value);
+      break;
+    case ARG_ENERGY_LEVEL_EXTENSION:
+      twolame->energy_level_extension = g_value_get_boolean (value);
+      break;
+    case ARG_EMPHASIS:
+      twolame->emphasis = g_value_get_enum (value);
+      break;
+    case ARG_ERROR_PROTECTION:
+      twolame->error_protection = g_value_get_boolean (value);
+      break;
+    case ARG_COPYRIGHT:
+      twolame->copyright = g_value_get_boolean (value);
+      break;
+    case ARG_ORIGINAL:
+      twolame->original = g_value_get_boolean (value);
+      break;
+    case ARG_VBR:
+      twolame->vbr = g_value_get_boolean (value);
+      break;
+    case ARG_VBR_LEVEL:
+      twolame->vbr_level = g_value_get_float (value);
+      break;
+    case ARG_ATH_LEVEL:
+      twolame->ath_level = g_value_get_float (value);
+      break;
+    case ARG_VBR_MAX_BITRATE:
+      twolame->vbr_max_bitrate = g_value_get_int (value);
+      break;
+    case ARG_QUICK_MODE:
+      twolame->quick_mode = g_value_get_boolean (value);
+      break;
+    case ARG_QUICK_MODE_COUNT:
+      twolame->quick_mode_count = g_value_get_int (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_two_lame_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstTwoLame *twolame = GST_TWO_LAME (object);
+
+  switch (prop_id) {
+    case ARG_MODE:
+      g_value_set_enum (value, twolame->mode);
+      break;
+    case ARG_PSYMODEL:
+      g_value_set_int (value, twolame->psymodel);
+      break;
+    case ARG_BITRATE:
+      g_value_set_int (value, twolame->bitrate);
+      break;
+    case ARG_PADDING:
+      g_value_set_enum (value, twolame->padding);
+      break;
+    case ARG_ENERGY_LEVEL_EXTENSION:
+      g_value_set_boolean (value, twolame->energy_level_extension);
+      break;
+    case ARG_EMPHASIS:
+      g_value_set_enum (value, twolame->emphasis);
+      break;
+    case ARG_ERROR_PROTECTION:
+      g_value_set_boolean (value, twolame->error_protection);
+      break;
+    case ARG_COPYRIGHT:
+      g_value_set_boolean (value, twolame->copyright);
+      break;
+    case ARG_ORIGINAL:
+      g_value_set_boolean (value, twolame->original);
+      break;
+    case ARG_VBR:
+      g_value_set_boolean (value, twolame->vbr);
+      break;
+    case ARG_VBR_LEVEL:
+      g_value_set_float (value, twolame->vbr_level);
+      break;
+    case ARG_ATH_LEVEL:
+      g_value_set_float (value, twolame->ath_level);
+      break;
+    case ARG_VBR_MAX_BITRATE:
+      g_value_set_int (value, twolame->vbr_max_bitrate);
+      break;
+    case ARG_QUICK_MODE:
+      g_value_set_boolean (value, twolame->quick_mode);
+      break;
+    case ARG_QUICK_MODE_COUNT:
+      g_value_set_int (value, twolame->quick_mode_count);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstFlowReturn
+gst_two_lame_flush_full (GstTwoLame * lame, gboolean push)
+{
+  GstBuffer *buf;
+  GstMapInfo map;
+  gint size;
+  GstFlowReturn result = GST_FLOW_OK;
+
+  if (!lame->glopts)
+    return GST_FLOW_OK;
+
+  buf = gst_buffer_new_and_alloc (16384);
+  gst_buffer_map (buf, &map, GST_MAP_WRITE);
+  size = twolame_encode_flush (lame->glopts, map.data, 16384);
+  gst_buffer_unmap (buf, &map);
+
+  if (size > 0 && push) {
+    gst_buffer_set_size (buf, size);
+    GST_DEBUG_OBJECT (lame, "pushing final packet of %u bytes", size);
+    result = gst_audio_encoder_finish_frame (GST_AUDIO_ENCODER (lame), buf, -1);
+  } else {
+    GST_DEBUG_OBJECT (lame, "no final packet (size=%d, push=%d)", size, push);
+    gst_buffer_unref (buf);
+    result = GST_FLOW_OK;
+  }
+  return result;
+}
+
+static void
+gst_two_lame_flush (GstAudioEncoder * enc)
+{
+  gst_two_lame_flush_full (GST_TWO_LAME (enc), FALSE);
+}
+
+static GstFlowReturn
+gst_two_lame_handle_frame (GstAudioEncoder * enc, GstBuffer * buf)
+{
+  GstTwoLame *twolame;
+  gint mp3_buffer_size, mp3_size;
+  GstBuffer *mp3_buf;
+  GstFlowReturn result;
+  gint num_samples;
+  GstMapInfo map, mp3_map;
+
+  twolame = GST_TWO_LAME (enc);
+
+  /* squeeze remaining and push */
+  if (G_UNLIKELY (buf == NULL))
+    return gst_two_lame_flush_full (twolame, TRUE);
+
+  gst_buffer_map (buf, &map, GST_MAP_READ);
+
+  if (twolame->float_input)
+    num_samples = map.size / 4;
+  else
+    num_samples = map.size / 2;
+
+  /* allocate space for output */
+  mp3_buffer_size = 1.25 * num_samples + 16384;
+  mp3_buf = gst_buffer_new_and_alloc (mp3_buffer_size);
+  gst_buffer_map (mp3_buf, &mp3_map, GST_MAP_WRITE);
+
+  if (twolame->num_channels == 1) {
+    if (twolame->float_input)
+      mp3_size = twolame_encode_buffer_float32 (twolame->glopts,
+          (float *) map.data,
+          (float *) map.data, num_samples, mp3_map.data, mp3_buffer_size);
+    else
+      mp3_size = twolame_encode_buffer (twolame->glopts,
+          (short int *) map.data,
+          (short int *) map.data, num_samples, mp3_map.data, mp3_buffer_size);
+  } else {
+    if (twolame->float_input)
+      mp3_size = twolame_encode_buffer_float32_interleaved (twolame->glopts,
+          (float *) map.data,
+          num_samples / twolame->num_channels, mp3_map.data, mp3_buffer_size);
+    else
+      mp3_size = twolame_encode_buffer_interleaved (twolame->glopts,
+          (short int *) map.data,
+          num_samples / twolame->num_channels, mp3_map.data, mp3_buffer_size);
+  }
+
+  GST_LOG_OBJECT (twolame, "encoded %" G_GSIZE_FORMAT " bytes of audio "
+      "to %d bytes of mp3", map.size, mp3_size);
+
+  gst_buffer_unmap (buf, &map);
+  gst_buffer_unmap (mp3_buf, &mp3_map);
+
+  if (mp3_size > 0) {
+    gst_buffer_set_size (mp3_buf, mp3_size);
+    result = gst_audio_encoder_finish_frame (enc, mp3_buf, -1);
+  } else {
+    if (mp3_size < 0) {
+      /* eat error ? */
+      g_warning ("error %d", mp3_size);
+    }
+    gst_buffer_unref (mp3_buf);
+    result = GST_FLOW_OK;
+  }
+
+  return result;
+}
+
+/* set up the encoder state */
+static gboolean
+gst_two_lame_setup (GstTwoLame * twolame)
+{
+
+#define CHECK_ERROR(command) G_STMT_START {\
+  if ((command) < 0) { \
+    GST_ERROR_OBJECT (twolame, "setup failed: " G_STRINGIFY (command)); \
+    return FALSE; \
+  } \
+}G_STMT_END
+
+  int retval;
+  GstCaps *allowed_caps;
+
+  GST_DEBUG_OBJECT (twolame, "starting setup");
+
+  /* check if we're already setup; if we are, we might want to check
+   * if this initialization is compatible with the previous one */
+  /* FIXME: do this */
+  if (twolame->setup) {
+    GST_WARNING_OBJECT (twolame, "already setup");
+    twolame->setup = FALSE;
+  }
+
+  twolame->glopts = twolame_init ();
+
+  if (twolame->glopts == NULL)
+    return FALSE;
+
+  /* copy the parameters over */
+  twolame_set_in_samplerate (twolame->glopts, twolame->samplerate);
+
+  /* let twolame choose default samplerate unless outgoing sample rate is fixed */
+  allowed_caps = gst_pad_get_allowed_caps (GST_AUDIO_ENCODER_SRC_PAD (twolame));
+
+  if (allowed_caps != NULL) {
+    GstStructure *structure;
+    gint samplerate;
+
+    structure = gst_caps_get_structure (allowed_caps, 0);
+
+    if (gst_structure_get_int (structure, "rate", &samplerate)) {
+      GST_DEBUG_OBJECT (twolame,
+          "Setting sample rate to %d as fixed in src caps", samplerate);
+      twolame_set_out_samplerate (twolame->glopts, samplerate);
+    } else {
+      GST_DEBUG_OBJECT (twolame, "Letting twolame choose sample rate");
+      twolame_set_out_samplerate (twolame->glopts, 0);
+    }
+    gst_caps_unref (allowed_caps);
+    allowed_caps = NULL;
+  } else {
+    GST_DEBUG_OBJECT (twolame,
+        "No peer yet, letting twolame choose sample rate");
+    twolame_set_out_samplerate (twolame->glopts, 0);
+  }
+
+  /* force mono encoding if we only have one channel */
+  if (twolame->num_channels == 1)
+    twolame->mode = 3;
+
+  /* Fix bitrates and MPEG version */
+
+  CHECK_ERROR (twolame_set_num_channels (twolame->glopts,
+          twolame->num_channels));
+
+  CHECK_ERROR (twolame_set_mode (twolame->glopts, twolame->mode));
+  CHECK_ERROR (twolame_set_psymodel (twolame->glopts, twolame->psymodel));
+  CHECK_AND_FIXUP_BITRATE (twolame, "bitrate", twolame->bitrate);
+  CHECK_ERROR (twolame_set_bitrate (twolame->glopts, twolame->bitrate));
+  CHECK_ERROR (twolame_set_padding (twolame->glopts, twolame->padding));
+  CHECK_ERROR (twolame_set_energy_levels (twolame->glopts,
+          twolame->energy_level_extension));
+  CHECK_ERROR (twolame_set_emphasis (twolame->glopts, twolame->emphasis));
+  CHECK_ERROR (twolame_set_error_protection (twolame->glopts,
+          twolame->error_protection));
+  CHECK_ERROR (twolame_set_copyright (twolame->glopts, twolame->copyright));
+  CHECK_ERROR (twolame_set_original (twolame->glopts, twolame->original));
+  CHECK_ERROR (twolame_set_VBR (twolame->glopts, twolame->vbr));
+  CHECK_ERROR (twolame_set_VBR_level (twolame->glopts, twolame->vbr_level));
+  CHECK_ERROR (twolame_set_ATH_level (twolame->glopts, twolame->ath_level));
+  CHECK_AND_FIXUP_BITRATE (twolame, "vbr-max-bitrate",
+      twolame->vbr_max_bitrate);
+  CHECK_ERROR (twolame_set_VBR_max_bitrate_kbps (twolame->glopts,
+          twolame->vbr_max_bitrate));
+  CHECK_ERROR (twolame_set_quick_mode (twolame->glopts, twolame->quick_mode));
+  CHECK_ERROR (twolame_set_quick_count (twolame->glopts,
+          twolame->quick_mode_count));
+
+  /* initialize the twolame encoder */
+  if ((retval = twolame_init_params (twolame->glopts)) >= 0) {
+    twolame->setup = TRUE;
+    /* FIXME: it would be nice to print out the mode here */
+    GST_INFO ("twolame encoder setup (%d kbit/s, %d Hz, %d channels)",
+        twolame->bitrate, twolame->samplerate, twolame->num_channels);
+  } else {
+    GST_ERROR_OBJECT (twolame, "twolame_init_params returned %d", retval);
+  }
+
+  GST_DEBUG_OBJECT (twolame, "done with setup");
+
+  return twolame->setup;
+#undef CHECK_ERROR
+}
+
+static gboolean
+gst_two_lame_get_default_settings (void)
+{
+  twolame_options *glopts = NULL;
+
+  glopts = twolame_init ();
+  if (glopts == NULL) {
+    GST_ERROR ("Couldn't initialize TwoLAME");
+    return FALSE;
+  }
+
+  twolame_set_num_channels (glopts, 2);
+  twolame_set_in_samplerate (glopts, 44100);
+
+  if (twolame_init_params (glopts) != 0) {
+    GST_ERROR ("Couldn't set default parameters");
+    return FALSE;
+  }
+
+  gst_two_lame_default_settings.mode = TWOLAME_JOINT_STEREO;    /* twolame_get_mode (glopts); */
+  gst_two_lame_default_settings.psymodel = twolame_get_psymodel (glopts);
+  gst_two_lame_default_settings.bitrate = twolame_get_bitrate (glopts);
+  gst_two_lame_default_settings.padding = twolame_get_padding (glopts);
+  gst_two_lame_default_settings.energy_level_extension =
+      twolame_get_energy_levels (glopts);
+  gst_two_lame_default_settings.emphasis = twolame_get_emphasis (glopts);
+  gst_two_lame_default_settings.error_protection =
+      twolame_get_error_protection (glopts);
+  gst_two_lame_default_settings.copyright = twolame_get_copyright (glopts);
+  gst_two_lame_default_settings.original = twolame_get_original (glopts);
+  gst_two_lame_default_settings.vbr = twolame_get_VBR (glopts);
+  gst_two_lame_default_settings.vbr_level = twolame_get_VBR_level (glopts);
+  gst_two_lame_default_settings.ath_level = twolame_get_ATH_level (glopts);
+  gst_two_lame_default_settings.vbr_max_bitrate =
+      twolame_get_VBR_max_bitrate_kbps (glopts);
+  gst_two_lame_default_settings.quick_mode = twolame_get_quick_mode (glopts);
+  gst_two_lame_default_settings.quick_mode_count =
+      twolame_get_quick_count (glopts);
+
+  twolame_close (&glopts);
+
+  return TRUE;
+}
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (debug, "twolame", 0, "twolame mp2 encoder");
+
+  if (!gst_two_lame_get_default_settings ())
+    return FALSE;
+
+#ifdef ENABLE_NLS
+  GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
+      LOCALEDIR);
+  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+#endif /* ENABLE_NLS */
+
+  if (!gst_element_register (plugin, "twolamemp2enc", GST_RANK_PRIMARY,
+          GST_TYPE_TWO_LAME))
+    return FALSE;
+
+  return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    twolame,
+    "Encode MP2s with TwoLAME",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
diff --git a/ext/twolame/gsttwolamemp2enc.h b/ext/twolame/gsttwolamemp2enc.h
new file mode 100644
index 000000000..72a6beaec
--- /dev/null
+++ b/ext/twolame/gsttwolamemp2enc.h
@@ -0,0 +1,88 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2008> Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ *
+ * 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.
+ */
+
+
+#ifndef __GST_TWO_LAME_H__
+#define __GST_TWO_LAME_H__
+
+
+#include <gst/gst.h>
+#include <gst/audio/gstaudioencoder.h>
+
+G_BEGIN_DECLS
+
+#include <twolame.h>
+
+#define GST_TYPE_TWO_LAME \
+  (gst_two_lame_get_type())
+#define GST_TWO_LAME(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_TWO_LAME,GstTwoLame))
+#define GST_TWO_LAME_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_TWO_LAME,GstTwoLameClass))
+#define GST_IS_TWO_LAME(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_TWO_LAME))
+#define GST_IS_TWO_LAME_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_TWO_LAME))
+
+typedef struct _GstTwoLame GstTwoLame;
+typedef struct _GstTwoLameClass GstTwoLameClass;
+
+/**
+ * GstTwoLame:
+ *
+ * Opaque data structure.
+ */
+struct _GstTwoLame {
+  GstAudioEncoder element;
+
+  gint samplerate;
+  gint num_channels;
+  gboolean float_input;
+  gboolean setup;
+
+  gint mode;
+  gint psymodel;
+  gint bitrate;
+  gint padding;
+  gboolean energy_level_extension;
+  gint emphasis;
+  gboolean error_protection;
+  gboolean copyright;
+  gboolean original;
+  gboolean vbr;
+  gfloat vbr_level;
+  gfloat ath_level;
+  gint vbr_max_bitrate;
+  gboolean quick_mode;
+  gint quick_mode_count;
+
+  twolame_options *glopts;
+};
+
+struct _GstTwoLameClass {
+  GstAudioEncoderClass parent_class;
+};
+
+GType gst_two_lame_get_type(void);
+
+G_END_DECLS
+
+
+#endif /* __GST_TWO_LAME_H__ */
diff --git a/ext/twolame/meson.build b/ext/twolame/meson.build
new file mode 100644
index 000000000..029a00eb4
--- /dev/null
+++ b/ext/twolame/meson.build
@@ -0,0 +1,12 @@
+twolame_dep = dependency('twolame', version : '>= 0.3.10', required : false)
+
+if twolame_dep.found()
+  twolame = library('gsttwolame',
+    ['gsttwolamemp2enc.c'],
+    c_args : ugly_args,
+    include_directories : [configinc, libsinc],
+    dependencies : [gstaudio_dep, twolame_dep],
+    install : true,
+    install_dir : plugins_install_dir,
+  )
+endif