ext/soundtouch/: Add BPM detection plugin based on SoundTouch's libBPM.

Original commit message from CVS:
* ext/soundtouch/Makefile.am:
* ext/soundtouch/gstbpmdetect.cc:
* ext/soundtouch/gstbpmdetect.hh:
* ext/soundtouch/plugin.c: (plugin_init):
Add BPM detection plugin based on SoundTouch's libBPM.
* ext/soundtouch/gstpitch.cc:
Allow sample rates until MAX instead of only 48kHz and remove the
buffer-frames field from that caps.
Clear the remaining samples completely when necessary to get into
a clean state again.

5 files changed, 343 insertions, 26 deletions

diff --git a/ext/soundtouch/Makefile.am b/ext/soundtouch/Makefile.am
index 2f92ef43..555c88c8 100644
--- a/ext/soundtouch/Makefile.am
+++ b/ext/soundtouch/Makefile.am
@@ -1,9 +1,13 @@
-plugin_LTLIBRARIES = libgstpitch.la
+plugin_LTLIBRARIES = libgstsoundtouch.la
 
-libgstpitch_la_SOURCES = gstpitch.cc
+libgstsoundtouch_la_SOURCES = \
+	plugin.c \
+	gstpitch.cc \
+	gstbpmdetect.cc
 
-libgstpitch_la_CXXFLAGS = $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(SOUNDTOUCH_CFLAGS)
-libgstpitch_la_LIBADD = $(GST_BASE_LIBS) $(GST_CONTROLLER_LIBS) $(GST_LIBS) $(SOUNDTOUCH_LIBS)
-libgstpitch_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstsoundtouch_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(SOUNDTOUCH_CFLAGS)
+libgstsoundtouch_la_CXXFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(SOUNDTOUCH_CFLAGS)
+libgstsoundtouch_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) $(GST_BASE_LIBS) $(GST_CONTROLLER_LIBS) $(GST_LIBS) $(SOUNDTOUCH_LIBS) -lgstaudio-$(GST_MAJORMINOR) -lBPM $(LIBM)
+libgstsoundtouch_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 
-noinst_HEADERS = gstpitch.hh
+noinst_HEADERS = gstpitch.hh gstbpmdetect.hh
diff --git a/ext/soundtouch/gstbpmdetect.cc b/ext/soundtouch/gstbpmdetect.cc
new file mode 100644
index 00000000..e9e2e274
--- /dev/null
+++ b/ext/soundtouch/gstbpmdetect.cc
@@ -0,0 +1,223 @@
+/* GStreamer
+ * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.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.
+ */
+
+#define FLOAT_SAMPLES 1
+#include <soundtouch/BPMDetect.h>
+/* FIXME: workaround for SoundTouch.h of version 1.3.1 defining those
+ * variables while it shouldn't. */
+#undef VERSION
+#undef PACKAGE_VERSION
+#undef PACKAGE_TARNAME
+#undef PACKAGE_STRING
+#undef PACKAGE_NAME
+#undef PACKAGE_BUGREPORT
+#undef PACKAGE
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/audio/audio.h>
+#include <gst/audio/gstaudiofilter.h>
+#include <math.h>
+#include <string.h>
+#include "gstbpmdetect.hh"
+
+GST_DEBUG_CATEGORY_STATIC (gst_bpm_detect_debug);
+#define GST_CAT_DEFAULT gst_bpm_detect_debug
+
+#define GST_BPM_DETECT_GET_PRIVATE(o) (o->priv)
+
+struct _GstBPMDetectPrivate
+{
+  gfloat bpm;
+  BPMDetect *detect;
+};
+
+#define ALLOWED_CAPS \
+    "audio/x-raw-float, "                                     \
+    " width = (int) 32, "                                     \
+    " endianness = (int) BYTE_ORDER, "                        \
+    " rate = (int) [ 8000, MAX ], "                           \
+    " channels = (int) [ 1, 2 ]"
+
+GST_BOILERPLATE (GstBPMDetect, gst_bpm_detect, GstAudioFilter,
+    GST_TYPE_AUDIO_FILTER);
+
+static void gst_bpm_detect_finalize (GObject * object);
+static gboolean gst_bpm_detect_stop (GstBaseTransform * trans);
+static gboolean gst_bpm_detect_event (GstBaseTransform * trans,
+    GstEvent * event);
+static GstFlowReturn gst_bpm_detect_transform_ip (GstBaseTransform * trans,
+    GstBuffer * in);
+static gboolean gst_bpm_detect_setup (GstAudioFilter * filter,
+    GstRingBufferSpec * format);
+
+static void
+gst_bpm_detect_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+  GstCaps *caps;
+
+  gst_element_class_set_details_simple (element_class, "BPM Detector",
+      "Filter/Analyzer/Audio", "Detect the BPM of an audio stream",
+      "Sebastian Dröge <slomo@circular-chaos.org>");
+
+  caps = gst_caps_from_string (ALLOWED_CAPS);
+  gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
+      caps);
+  gst_caps_unref (caps);
+}
+
+static void
+gst_bpm_detect_class_init (GstBPMDetectClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
+  GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (klass);
+
+  GST_DEBUG_CATEGORY_INIT (gst_bpm_detect_debug, "bpm_detect", 0,
+      "audio bpm detection element");
+
+  gobject_class->finalize = gst_bpm_detect_finalize;
+
+  trans_class->stop = GST_DEBUG_FUNCPTR (gst_bpm_detect_stop);
+  trans_class->event = GST_DEBUG_FUNCPTR (gst_bpm_detect_event);
+  trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_bpm_detect_transform_ip);
+  trans_class->passthrough_on_same_caps = TRUE;
+
+  filter_class->setup = GST_DEBUG_FUNCPTR (gst_bpm_detect_setup);
+
+  g_type_class_add_private (gobject_class, sizeof (GstBPMDetectPrivate));
+}
+
+static void
+gst_bpm_detect_init (GstBPMDetect * bpm_detect, GstBPMDetectClass * g_class)
+{
+  bpm_detect->priv = G_TYPE_INSTANCE_GET_PRIVATE ((bpm_detect),
+      GST_TYPE_BPM_DETECT, GstBPMDetectPrivate);
+
+  bpm_detect->priv->detect = NULL;
+  bpm_detect->bpm = 0.0;
+}
+
+static void
+gst_bpm_detect_finalize (GObject * object)
+{
+  GstBPMDetect *bpm_detect = GST_BPM_DETECT (object);
+
+  if (bpm_detect->priv->detect) {
+    delete bpm_detect->priv->detect;
+
+    bpm_detect->priv->detect = NULL;
+  }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gboolean
+gst_bpm_detect_stop (GstBaseTransform * trans)
+{
+  GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
+
+  if (bpm_detect->priv->detect) {
+    delete bpm_detect->priv->detect;
+
+    bpm_detect->priv->detect = NULL;
+  }
+  bpm_detect->bpm = 0.0;
+
+  return TRUE;
+}
+
+static gboolean
+gst_bpm_detect_event (GstBaseTransform * trans, GstEvent * event)
+{
+  GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_FLUSH_STOP:
+    case GST_EVENT_EOS:
+    case GST_EVENT_NEWSEGMENT:
+      if (bpm_detect->priv->detect) {
+        delete bpm_detect->priv->detect;
+
+        bpm_detect->priv->detect = NULL;
+      }
+      bpm_detect->bpm = 0.0;
+      break;
+    default:
+      break;
+  }
+
+  return TRUE;
+}
+
+static gboolean
+gst_bpm_detect_setup (GstAudioFilter * filter, GstRingBufferSpec * format)
+{
+  GstBPMDetect *bpm_detect = GST_BPM_DETECT (filter);
+
+  if (bpm_detect->priv->detect) {
+    delete bpm_detect->priv->detect;
+
+    bpm_detect->priv->detect = NULL;
+  }
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_bpm_detect_transform_ip (GstBaseTransform * trans, GstBuffer * in)
+{
+  GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
+  GstAudioFilter *filter = GST_AUDIO_FILTER (trans);
+  gint nsamples;
+  gfloat *data;
+  gfloat bpm;
+
+  if (filter->format.channels == 0 || filter->format.rate == 0) {
+    GST_ERROR_OBJECT (bpm_detect, "No channels or rate set yet");
+    return GST_FLOW_ERROR;
+  }
+
+  nsamples = GST_BUFFER_SIZE (in) / (4 * filter->format.channels);
+
+  if (!bpm_detect->priv->detect)
+    bpm_detect->priv->detect =
+        new BPMDetect (filter->format.channels, filter->format.rate);
+
+  data = (gfloat *) g_memdup (GST_BUFFER_DATA (in), GST_BUFFER_SIZE (in));
+  bpm_detect->priv->detect->inputSamples (data, nsamples);
+  g_free (data);
+
+  bpm = bpm_detect->priv->detect->getBpm ();
+  if (bpm != 0.0 && fabs (bpm_detect->bpm - bpm) >= 1.0) {
+    GstTagList *tags = gst_tag_list_new ();
+
+    gst_tag_list_add (tags, GST_TAG_MERGE_REPLACE_ALL, GST_TAG_BEATS_PER_MINUTE,
+        bpm, NULL);
+    gst_element_found_tags (GST_ELEMENT (bpm_detect), tags);
+
+    GST_INFO_OBJECT (bpm_detect, "Detected BPM: %lf\n", bpm);
+    bpm_detect->bpm = bpm;
+  }
+
+  return GST_FLOW_OK;
+}
diff --git a/ext/soundtouch/gstbpmdetect.hh b/ext/soundtouch/gstbpmdetect.hh
new file mode 100644
index 00000000..2f6abdcf
--- /dev/null
+++ b/ext/soundtouch/gstbpmdetect.hh
@@ -0,0 +1,58 @@
+/* GStreamer
+ * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.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.
+ */
+
+
+#ifndef __GST_BPM_DETECT_H__
+#define __GST_BPM_DETECT_H__
+
+
+#include <gst/gst.h>
+#include <gst/base/gstbasetransform.h>
+#include <gst/audio/gstaudiofilter.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_BPM_DETECT            (gst_bpm_detect_get_type())
+#define GST_BPM_DETECT(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BPM_DETECT,GstBPMDetect))
+#define GST_IS_BPM_DETECT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BPM_DETECT))
+#define GST_BPM_DETECT_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_BPM_DETECT,GstBPMDetectClass))
+#define GST_IS_BPM_DETECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_BPM_DETECT))
+
+typedef struct _GstBPMDetect GstBPMDetect;
+typedef struct _GstBPMDetectClass GstBPMDetectClass;
+typedef struct _GstBPMDetectPrivate GstBPMDetectPrivate;
+
+struct _GstBPMDetect {
+  GstAudioFilter element;
+
+  gfloat bpm;
+
+  GstBPMDetectPrivate *priv;
+};
+
+struct _GstBPMDetectClass {
+  GstAudioFilterClass parent_class;
+};
+
+GType gst_bpm_detect_get_type (void);
+
+
+G_END_DECLS
+
+#endif /* __GST_BPM_DETECT_H__ */
diff --git a/ext/soundtouch/gstpitch.cc b/ext/soundtouch/gstpitch.cc
index 83c043e9..7ee726f0 100644
--- a/ext/soundtouch/gstpitch.cc
+++ b/ext/soundtouch/gstpitch.cc
@@ -62,11 +62,10 @@ enum
 #define SUPPORTED_CAPS \
 GST_STATIC_CAPS( \
   "audio/x-raw-float, " \
-    "rate = (int) [ 8000, 48000 ], " \
+    "rate = (int) [ 8000, MAX ], " \
     "channels = (int) [ 1, 2 ], " \
     "endianness = (int) BYTE_ORDER, " \
-    "width = (int) 32, " \
-    "buffer-frames = (int) [ 0, MAX ]" \
+    "width = (int) 32" \
 )
 
 static GstStaticPadTemplate gst_pitch_sink_template =
@@ -124,6 +123,9 @@ gst_pitch_class_init (GstPitchClass * klass)
   gobject_class = G_OBJECT_CLASS (klass);
   element_class = GST_ELEMENT_CLASS (klass);
 
+  GST_DEBUG_CATEGORY_INIT (pitch_debug, "pitch", 0,
+      "audio pitch control element");
+
   gobject_class->set_property = gst_pitch_set_property;
   gobject_class->get_property = gst_pitch_get_property;
   gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pitch_dispose);
@@ -725,9 +727,11 @@ gst_pitch_sink_event (GstPad * pad, GstEvent * event)
   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_FLUSH_STOP:
       gst_pitch_flush_buffer (pitch, FALSE);
+      pitch->priv->st->clear ();
       break;
     case GST_EVENT_EOS:
       gst_pitch_flush_buffer (pitch, TRUE);
+      pitch->priv->st->clear ();
       break;
     case GST_EVENT_NEWSEGMENT:
       if (!gst_pitch_process_segment (pitch, &event)) {
@@ -737,6 +741,7 @@ gst_pitch_sink_event (GstPad * pad, GstEvent * event)
         GST_PITCH_GET_PRIVATE (pitch)->pending_segment = event;
         event = NULL;
       }
+      pitch->priv->st->clear ();
       break;
     default:
       break;
@@ -812,6 +817,7 @@ gst_pitch_change_state (GstElement * element, GstStateChange transition)
     case GST_STATE_CHANGE_READY_TO_PAUSED:
       pitch->next_buffer_time = 0;
       pitch->next_buffer_offset = 0;
+      pitch->priv->st->clear ();
       break;
     case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
       break;
@@ -839,20 +845,3 @@ gst_pitch_change_state (GstElement * element, GstStateChange transition)
 
   return ret;
 }
-
-static gboolean
-plugin_init (GstPlugin * plugin)
-{
-  gst_controller_init (NULL, NULL);
-
-  GST_DEBUG_CATEGORY_INIT (pitch_debug, "pitch", 0,
-      "audio pitch control element");
-
-  return gst_element_register (plugin, "pitch", GST_RANK_NONE, GST_TYPE_PITCH);
-}
-
-GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
-    GST_VERSION_MINOR,
-    "soundtouch",
-    "Audio Pitch Controller",
-    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
diff --git a/ext/soundtouch/plugin.c b/ext/soundtouch/plugin.c
new file mode 100644
index 00000000..5e8cb156
--- /dev/null
+++ b/ext/soundtouch/plugin.c
@@ -0,0 +1,43 @@
+/* GStreamer soundtouch plugin
+ * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <gst/gst.h>
+#include <gst/controller/gstcontroller.h>
+#include "gstpitch.hh"
+#include "gstbpmdetect.hh"
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  gst_controller_init (NULL, NULL);
+
+  return gst_element_register (plugin, "pitch", GST_RANK_NONE, GST_TYPE_PITCH)
+      && gst_element_register (plugin, "bpmdetect", GST_RANK_NONE,
+      GST_TYPE_BPM_DETECT);
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "soundtouch",
+    "Audio Pitch Controller & BPM Detection",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)