mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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254 lines
7.1 KiB
C++
254 lines
7.1 KiB
C++
/* GStreamer
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* Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* FIXME: workaround for SoundTouch.h of version 1.3.1 defining those
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* variables while it shouldn't. */
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#undef VERSION
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#undef PACKAGE_VERSION
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#undef PACKAGE_TARNAME
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#undef PACKAGE_STRING
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#undef PACKAGE_NAME
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#undef PACKAGE_BUGREPORT
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#undef PACKAGE
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#define FLOAT_SAMPLES 1
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#include <soundtouch/BPMDetect.h>
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#include <gst/audio/audio.h>
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#include <gst/audio/gstaudiofilter.h>
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#include <math.h>
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#include <string.h>
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#include "gstbpmdetect.hh"
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GST_DEBUG_CATEGORY_STATIC (gst_bpm_detect_debug);
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#define GST_CAT_DEFAULT gst_bpm_detect_debug
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#define GST_BPM_DETECT_GET_PRIVATE(o) (o->priv)
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struct _GstBPMDetectPrivate
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{
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gfloat bpm;
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#ifdef HAVE_SOUNDTOUCH_1_4
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soundtouch::BPMDetect * detect;
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#else
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BPMDetect *detect;
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#endif
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};
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#define ALLOWED_CAPS \
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"audio/x-raw-float, " \
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" width = (int) 32, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 8000, MAX ], " \
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" channels = (int) [ 1, 2 ]"
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GST_BOILERPLATE (GstBPMDetect, gst_bpm_detect, GstAudioFilter,
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GST_TYPE_AUDIO_FILTER);
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static void gst_bpm_detect_finalize (GObject * object);
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static gboolean gst_bpm_detect_stop (GstBaseTransform * trans);
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static gboolean gst_bpm_detect_event (GstBaseTransform * trans,
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GstEvent * event);
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static GstFlowReturn gst_bpm_detect_transform_ip (GstBaseTransform * trans,
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GstBuffer * in);
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static gboolean gst_bpm_detect_setup (GstAudioFilter * filter,
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GstRingBufferSpec * format);
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static void
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gst_bpm_detect_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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GstCaps *caps;
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gst_element_class_set_details_simple (element_class, "BPM Detector",
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"Filter/Analyzer/Audio", "Detect the BPM of an audio stream",
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"Sebastian Dröge <slomo@circular-chaos.org>");
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caps = gst_caps_from_string (ALLOWED_CAPS);
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gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
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caps);
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gst_caps_unref (caps);
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}
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static void
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gst_bpm_detect_class_init (GstBPMDetectClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
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GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (klass);
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GST_DEBUG_CATEGORY_INIT (gst_bpm_detect_debug, "bpm_detect", 0,
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"audio bpm detection element");
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gobject_class->finalize = gst_bpm_detect_finalize;
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trans_class->stop = GST_DEBUG_FUNCPTR (gst_bpm_detect_stop);
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trans_class->event = GST_DEBUG_FUNCPTR (gst_bpm_detect_event);
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_bpm_detect_transform_ip);
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trans_class->passthrough_on_same_caps = TRUE;
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filter_class->setup = GST_DEBUG_FUNCPTR (gst_bpm_detect_setup);
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g_type_class_add_private (gobject_class, sizeof (GstBPMDetectPrivate));
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}
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static void
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gst_bpm_detect_init (GstBPMDetect * bpm_detect, GstBPMDetectClass * g_class)
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{
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bpm_detect->priv = G_TYPE_INSTANCE_GET_PRIVATE ((bpm_detect),
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GST_TYPE_BPM_DETECT, GstBPMDetectPrivate);
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bpm_detect->priv->detect = NULL;
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bpm_detect->bpm = 0.0;
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}
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static void
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gst_bpm_detect_finalize (GObject * object)
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{
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GstBPMDetect *bpm_detect = GST_BPM_DETECT (object);
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if (bpm_detect->priv->detect) {
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delete bpm_detect->priv->detect;
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bpm_detect->priv->detect = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_bpm_detect_stop (GstBaseTransform * trans)
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{
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GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
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if (bpm_detect->priv->detect) {
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delete bpm_detect->priv->detect;
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bpm_detect->priv->detect = NULL;
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}
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bpm_detect->bpm = 0.0;
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return TRUE;
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}
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static gboolean
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gst_bpm_detect_event (GstBaseTransform * trans, GstEvent * event)
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{
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GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_STOP:
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case GST_EVENT_EOS:
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case GST_EVENT_NEWSEGMENT:
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if (bpm_detect->priv->detect) {
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delete bpm_detect->priv->detect;
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bpm_detect->priv->detect = NULL;
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}
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bpm_detect->bpm = 0.0;
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break;
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default:
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break;
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}
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return TRUE;
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}
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static gboolean
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gst_bpm_detect_setup (GstAudioFilter * filter, GstRingBufferSpec * format)
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{
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GstBPMDetect *bpm_detect = GST_BPM_DETECT (filter);
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if (bpm_detect->priv->detect) {
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delete bpm_detect->priv->detect;
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bpm_detect->priv->detect = NULL;
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}
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return TRUE;
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}
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static GstFlowReturn
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gst_bpm_detect_transform_ip (GstBaseTransform * trans, GstBuffer * in)
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{
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GstBPMDetect *bpm_detect = GST_BPM_DETECT (trans);
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GstAudioFilter *filter = GST_AUDIO_FILTER (trans);
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gint nsamples;
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gfloat bpm;
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if (G_UNLIKELY (!bpm_detect->priv->detect)) {
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if (filter->format.channels == 0 || filter->format.rate == 0) {
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GST_ERROR_OBJECT (bpm_detect, "No channels or rate set yet");
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return GST_FLOW_ERROR;
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}
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#ifdef HAVE_SOUNDTOUCH_1_4
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bpm_detect->priv->detect =
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new soundtouch::BPMDetect (filter->format.channels,
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filter->format.rate);
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#else
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bpm_detect->priv->detect =
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new BPMDetect (filter->format.channels, filter->format.rate);
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#endif
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}
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nsamples = GST_BUFFER_SIZE (in) / (4 * filter->format.channels);
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/* For stereo BPMDetect->inputSamples() does downmixing into the input
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* data but our buffer data shouldn't be modified.
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*/
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if (filter->format.channels == 1) {
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gfloat *inbuf = (gfloat *) GST_BUFFER_DATA (in);
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while (nsamples > 0) {
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bpm_detect->priv->detect->inputSamples (inbuf, MIN (nsamples, 2048));
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nsamples -= 2048;
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inbuf += 2048;
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}
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} else {
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gfloat *inbuf, *intmp, data[2 * 2048];
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inbuf = (gfloat *) GST_BUFFER_DATA (in);
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intmp = data;
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while (nsamples > 0) {
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memcpy (intmp, inbuf, sizeof (gfloat) * 2 * MIN (nsamples, 2048));
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bpm_detect->priv->detect->inputSamples (intmp, MIN (nsamples, 2048));
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nsamples -= 2048;
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inbuf += 2048 * 2;
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}
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}
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bpm = bpm_detect->priv->detect->getBpm ();
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if (bpm >= 1.0 && fabs (bpm_detect->bpm - bpm) >= 1.0) {
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GstTagList *tags = gst_tag_list_new ();
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gst_tag_list_add (tags, GST_TAG_MERGE_REPLACE_ALL, GST_TAG_BEATS_PER_MINUTE,
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bpm, (void *) NULL);
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gst_element_found_tags (GST_ELEMENT (bpm_detect), tags);
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GST_INFO_OBJECT (bpm_detect, "Detected BPM: %lf\n", bpm);
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bpm_detect->bpm = bpm;
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}
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return GST_FLOW_OK;
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}
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