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-rw-r--r--ext/soundtouch/gstbpmdetect.cc223
1 files changed, 223 insertions, 0 deletions
diff --git a/ext/soundtouch/gstbpmdetect.cc b/ext/soundtouch/gstbpmdetect.cc
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+++ b/ext/soundtouch/gstbpmdetect.cc
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+/* 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;
+}
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