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705 lines
23 KiB
C
705 lines
23 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* <2006> Stefan Kost <ensonic@users.sf.net>
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* <2007-2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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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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/**
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* SECTION:element-spectrum
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*
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* The Spectrum element analyzes the frequency spectrum of an audio signal.
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* If the #GstSpectrum:post-messages property is #TRUE, it sends analysis results
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* as application messages named
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* <classname>"spectrum"</classname> after each interval of time given
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* by the #GstSpectrum:interval property.
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*
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* The message's structure contains some combination of these fields:
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* <itemizedlist>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"timestamp"</classname>:
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* the timestamp of the buffer that triggered the message.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"stream-time"</classname>:
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* the stream time of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"running-time"</classname>:
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* the running_time of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"duration"</classname>:
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* the duration of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"endtime"</classname>:
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* the end time of the buffer that triggered the message as stream time (this
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* is deprecated, as it can be calculated from stream-time + duration)
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstValueList of #gfloat
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* <classname>"magnitude"</classname>:
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* the level for each frequency band in dB. All values below the value of the
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* #GstSpectrum:threshold property will be set to the threshold. Only present
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* if the message-magnitude property is true.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstValueList of #gfloat
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* <classname>"phase"</classname>:
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* The phase for each frequency band. The value is between -pi and pi. Only
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* present if the message-phase property is true.
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* </para>
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* </listitem>
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* </itemizedlist>
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*
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* <refsect2>
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* <title>Example application</title>
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* |[
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* <xi:include xmlns:xi="http://www.w3.org/2003/XInclude" parse="text" href="../../../../tests/examples/spectrum/spectrum-example.c" />
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* ]|
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* </refsect2>
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*
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* Last reviewed on 2009-01-14 (0.10.12)
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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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#include <string.h>
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#include <math.h>
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#include "gstspectrum.h"
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GST_DEBUG_CATEGORY_STATIC (gst_spectrum_debug);
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#define GST_CAT_DEFAULT gst_spectrum_debug
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/* elementfactory information */
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#define ALLOWED_CAPS \
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"audio/x-raw-int, " \
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" width = (int) 16, " \
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" depth = (int) [ 1, 16 ], " \
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" signed = (boolean) true, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 1, MAX ], " \
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" channels = (int) [ 1, MAX ]; " \
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"audio/x-raw-int, " \
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" width = (int) 24, " \
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" depth = (int) [ 1, 24 ], " \
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" signed = (boolean) true, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 1, MAX ], " \
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" channels = (int) [ 1, MAX ]; " \
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"audio/x-raw-int, " \
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" width = (int) 32, " \
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" depth = (int) [ 1, 32 ], " \
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" signed = (boolean) true, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 1, MAX ], " \
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" channels = (int) [ 1, MAX ]; " \
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"audio/x-raw-float, " \
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" width = (int) { 32, 64 }, " \
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" endianness = (int) BYTE_ORDER, " \
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" rate = (int) [ 1, MAX ], " \
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" channels = (int) [ 1, MAX ]"
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/* Spectrum properties */
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#define DEFAULT_MESSAGE TRUE
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#define DEFAULT_POST_MESSAGES TRUE
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#define DEFAULT_MESSAGE_MAGNITUDE TRUE
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#define DEFAULT_MESSAGE_PHASE FALSE
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#define DEFAULT_INTERVAL (GST_SECOND / 10)
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#define DEFAULT_BANDS 128
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#define DEFAULT_THRESHOLD -60
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enum
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{
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PROP_0,
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PROP_MESSAGE,
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PROP_POST_MESSAGES,
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PROP_MESSAGE_MAGNITUDE,
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PROP_MESSAGE_PHASE,
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PROP_INTERVAL,
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PROP_BANDS,
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PROP_THRESHOLD
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};
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GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstAudioFilter,
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GST_TYPE_AUDIO_FILTER);
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static void gst_spectrum_finalize (GObject * object);
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static void gst_spectrum_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_spectrum_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_spectrum_start (GstBaseTransform * trans);
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static gboolean gst_spectrum_stop (GstBaseTransform * trans);
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static GstFlowReturn gst_spectrum_transform_ip (GstBaseTransform * trans,
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GstBuffer * in);
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static gboolean gst_spectrum_setup (GstAudioFilter * base,
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GstRingBufferSpec * format);
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static void
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gst_spectrum_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, "Spectrum analyzer",
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"Filter/Analyzer/Audio",
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"Run an FFT on the audio signal, output spectrum data",
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"Erik Walthinsen <omega@cse.ogi.edu>, "
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"Stefan Kost <ensonic@users.sf.net>, "
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"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
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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_spectrum_class_init (GstSpectrumClass * 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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gobject_class->set_property = gst_spectrum_set_property;
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gobject_class->get_property = gst_spectrum_get_property;
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gobject_class->finalize = gst_spectrum_finalize;
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trans_class->start = GST_DEBUG_FUNCPTR (gst_spectrum_start);
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trans_class->stop = GST_DEBUG_FUNCPTR (gst_spectrum_stop);
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_spectrum_transform_ip);
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trans_class->passthrough_on_same_caps = TRUE;
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filter_class->setup = GST_DEBUG_FUNCPTR (gst_spectrum_setup);
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/* FIXME 0.11, remove in favour of post-messages */
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g_object_class_install_property (gobject_class, PROP_MESSAGE,
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g_param_spec_boolean ("message", "Message",
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"Whether to post a 'spectrum' element message on the bus for each "
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"passed interval (deprecated, use post-messages)", DEFAULT_MESSAGE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstSpectrum:post-messages
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*
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* Post messages on the bus with spectrum information.
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*
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* Since: 0.10.17
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*/
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g_object_class_install_property (gobject_class, PROP_POST_MESSAGES,
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g_param_spec_boolean ("post-messages", "Post Messages",
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"Whether to post a 'spectrum' element message on the bus for each "
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"passed interval", DEFAULT_POST_MESSAGES,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MESSAGE_MAGNITUDE,
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g_param_spec_boolean ("message-magnitude", "Magnitude",
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"Whether to add a 'magnitude' field to the structure of any "
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"'spectrum' element messages posted on the bus",
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DEFAULT_MESSAGE_MAGNITUDE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MESSAGE_PHASE,
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g_param_spec_boolean ("message-phase", "Phase",
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"Whether to add a 'phase' field to the structure of any "
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"'spectrum' element messages posted on the bus",
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DEFAULT_MESSAGE_PHASE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_INTERVAL,
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g_param_spec_uint64 ("interval", "Interval",
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"Interval of time between message posts (in nanoseconds)",
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1, G_MAXUINT64, DEFAULT_INTERVAL,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_BANDS,
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g_param_spec_uint ("bands", "Bands", "Number of frequency bands",
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0, G_MAXUINT, DEFAULT_BANDS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_THRESHOLD,
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g_param_spec_int ("threshold", "Threshold",
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"dB threshold for result. All lower values will be set to this",
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G_MININT, 0, DEFAULT_THRESHOLD,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
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"audio spectrum analyser element");
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}
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static void
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gst_spectrum_init (GstSpectrum * spectrum, GstSpectrumClass * g_class)
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{
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spectrum->post_messages = DEFAULT_POST_MESSAGES;
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spectrum->message_magnitude = DEFAULT_MESSAGE_MAGNITUDE;
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spectrum->message_phase = DEFAULT_MESSAGE_PHASE;
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spectrum->interval = DEFAULT_INTERVAL;
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spectrum->bands = DEFAULT_BANDS;
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spectrum->threshold = DEFAULT_THRESHOLD;
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}
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static void
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gst_spectrum_flush (GstSpectrum * spectrum)
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{
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spectrum->num_frames = 0;
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spectrum->num_fft = 0;
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spectrum->accumulated_error = 0;
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}
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static void
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gst_spectrum_reset_state (GstSpectrum * spectrum)
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{
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GST_DEBUG_OBJECT (spectrum, "resetting state");
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if (spectrum->fft_ctx)
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gst_fft_f32_free (spectrum->fft_ctx);
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g_free (spectrum->input);
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g_free (spectrum->input_tmp);
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g_free (spectrum->freqdata);
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g_free (spectrum->spect_magnitude);
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g_free (spectrum->spect_phase);
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spectrum->fft_ctx = NULL;
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spectrum->input = NULL;
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spectrum->input_tmp = NULL;
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spectrum->freqdata = NULL;
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spectrum->spect_magnitude = NULL;
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spectrum->spect_phase = NULL;
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gst_spectrum_flush (spectrum);
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}
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static void
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gst_spectrum_finalize (GObject * object)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (object);
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gst_spectrum_reset_state (spectrum);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_spectrum_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSpectrum *filter = GST_SPECTRUM (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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case PROP_POST_MESSAGES:
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filter->post_messages = g_value_get_boolean (value);
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break;
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case PROP_MESSAGE_MAGNITUDE:
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filter->message_magnitude = g_value_get_boolean (value);
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break;
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case PROP_MESSAGE_PHASE:
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filter->message_phase = g_value_get_boolean (value);
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break;
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case PROP_INTERVAL:{
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guint64 interval = g_value_get_uint64 (value);
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if (filter->interval != interval) {
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GST_BASE_TRANSFORM_LOCK (filter);
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filter->interval = g_value_get_uint64 (value);
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gst_spectrum_reset_state (filter);
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GST_BASE_TRANSFORM_UNLOCK (filter);
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}
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}
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break;
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case PROP_BANDS:{
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guint bands = g_value_get_uint (value);
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if (filter->bands != bands) {
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GST_BASE_TRANSFORM_LOCK (filter);
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filter->bands = bands;
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gst_spectrum_reset_state (filter);
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GST_BASE_TRANSFORM_UNLOCK (filter);
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}
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}
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break;
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case PROP_THRESHOLD:
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filter->threshold = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_spectrum_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstSpectrum *filter = GST_SPECTRUM (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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case PROP_POST_MESSAGES:
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g_value_set_boolean (value, filter->post_messages);
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break;
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case PROP_MESSAGE_MAGNITUDE:
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g_value_set_boolean (value, filter->message_magnitude);
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break;
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case PROP_MESSAGE_PHASE:
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g_value_set_boolean (value, filter->message_phase);
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break;
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case PROP_INTERVAL:
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g_value_set_uint64 (value, filter->interval);
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break;
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case PROP_BANDS:
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g_value_set_uint (value, filter->bands);
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break;
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case PROP_THRESHOLD:
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g_value_set_int (value, filter->threshold);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_spectrum_start (GstBaseTransform * trans)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (trans);
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gst_spectrum_reset_state (spectrum);
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return TRUE;
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}
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static gboolean
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gst_spectrum_stop (GstBaseTransform * trans)
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{
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GstSpectrum *spectrum = GST_SPECTRUM (trans);
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gst_spectrum_reset_state (spectrum);
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return TRUE;
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}
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static gboolean
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gst_spectrum_setup (GstAudioFilter * base, GstRingBufferSpec * format)
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{
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GstSpectrum *filter = GST_SPECTRUM (base);
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gst_spectrum_reset_state (filter);
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return TRUE;
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}
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static GstMessage *
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gst_spectrum_message_new (GstSpectrum * spectrum, GstClockTime timestamp,
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GstClockTime duration)
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{
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GstBaseTransform *trans = GST_BASE_TRANSFORM_CAST (spectrum);
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GstStructure *s;
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GValue v = { 0, };
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GValue *l;
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guint i;
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gfloat *spect_magnitude = spectrum->spect_magnitude;
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gfloat *spect_phase = spectrum->spect_phase;
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GstClockTime endtime, running_time, stream_time;
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GST_DEBUG_OBJECT (spectrum, "preparing message, spect = %p, bands =%d ",
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spect_magnitude, spectrum->bands);
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running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
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timestamp);
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stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
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timestamp);
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/* endtime is for backwards compatibility */
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endtime = stream_time + duration;
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s = gst_structure_new ("spectrum",
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"endtime", GST_TYPE_CLOCK_TIME, endtime,
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"timestamp", G_TYPE_UINT64, timestamp,
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"stream-time", G_TYPE_UINT64, stream_time,
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"running-time", G_TYPE_UINT64, running_time,
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"duration", G_TYPE_UINT64, duration, NULL);
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if (spectrum->message_magnitude) {
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/* FIXME 0.11: this should be an array, not a list */
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g_value_init (&v, GST_TYPE_LIST);
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/* will copy-by-value */
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gst_structure_set_value (s, "magnitude", &v);
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g_value_unset (&v);
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g_value_init (&v, G_TYPE_FLOAT);
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l = (GValue *) gst_structure_get_value (s, "magnitude");
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for (i = 0; i < spectrum->bands; i++) {
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g_value_set_float (&v, spect_magnitude[i]);
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gst_value_list_append_value (l, &v); /* copies by value */
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}
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g_value_unset (&v);
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}
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if (spectrum->message_phase) {
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/* FIXME 0.11: this should be an array, not a list */
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g_value_init (&v, GST_TYPE_LIST);
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/* will copy-by-value */
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gst_structure_set_value (s, "phase", &v);
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g_value_unset (&v);
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g_value_init (&v, G_TYPE_FLOAT);
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l = (GValue *) gst_structure_get_value (s, "phase");
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for (i = 0; i < spectrum->bands; i++) {
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g_value_set_float (&v, spect_phase[i]);
|
|
gst_value_list_append_value (l, &v); /* copies by value */
|
|
}
|
|
g_value_unset (&v);
|
|
}
|
|
|
|
return gst_message_new_element (GST_OBJECT (spectrum), s);
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
|
|
{
|
|
GstSpectrum *spectrum = GST_SPECTRUM (trans);
|
|
guint i;
|
|
guint rate = GST_AUDIO_FILTER (spectrum)->format.rate;
|
|
guint channels = GST_AUDIO_FILTER (spectrum)->format.channels;
|
|
gfloat max_value =
|
|
(1UL << (GST_AUDIO_FILTER (spectrum)->format.depth - 1)) - 1;
|
|
guint width = GST_AUDIO_FILTER (spectrum)->format.width / 8;
|
|
gboolean fp = (GST_AUDIO_FILTER (spectrum)->format.type == GST_BUFTYPE_FLOAT);
|
|
guint bands = spectrum->bands;
|
|
guint nfft = 2 * bands - 2;
|
|
gint threshold = spectrum->threshold;
|
|
guint input_pos;
|
|
gfloat *input;
|
|
gfloat *input_tmp;
|
|
GstFFTF32Complex *freqdata;
|
|
gfloat *spect_magnitude;
|
|
gfloat *spect_phase;
|
|
GstFFTF32 *fft_ctx;
|
|
const guint8 *data = GST_BUFFER_DATA (buffer);
|
|
guint size = GST_BUFFER_SIZE (buffer);
|
|
gboolean have_full_interval;
|
|
|
|
GST_LOG_OBJECT (spectrum, "input size: %d bytes", GST_BUFFER_SIZE (buffer));
|
|
|
|
if (GST_BUFFER_IS_DISCONT (buffer)) {
|
|
GST_DEBUG_OBJECT (spectrum, "Discontinuity detected -- flushing");
|
|
gst_spectrum_flush (spectrum);
|
|
}
|
|
|
|
/* If we don't have a FFT context yet (or it was reset due to parameter
|
|
* changes) get one and allocate memory for everything
|
|
*/
|
|
if (spectrum->fft_ctx == NULL) {
|
|
GST_DEBUG_OBJECT (spectrum, "allocating for bands %u", bands);
|
|
|
|
spectrum->fft_ctx = gst_fft_f32_new (nfft, FALSE);
|
|
spectrum->input = g_new0 (gfloat, nfft);
|
|
spectrum->input_tmp = g_new0 (gfloat, nfft);
|
|
spectrum->freqdata = g_new0 (GstFFTF32Complex, bands);
|
|
spectrum->spect_magnitude = g_new0 (gfloat, bands);
|
|
spectrum->spect_phase = g_new0 (gfloat, bands);
|
|
|
|
spectrum->frames_per_interval =
|
|
gst_util_uint64_scale (spectrum->interval, rate, GST_SECOND);
|
|
spectrum->error_per_interval = (spectrum->interval * rate) % GST_SECOND;
|
|
if (spectrum->frames_per_interval == 0)
|
|
spectrum->frames_per_interval = 1;
|
|
|
|
spectrum->input_pos = 0;
|
|
|
|
gst_spectrum_flush (spectrum);
|
|
}
|
|
|
|
if (spectrum->num_frames == 0)
|
|
spectrum->message_ts = GST_BUFFER_TIMESTAMP (buffer);
|
|
|
|
input = spectrum->input;
|
|
input_tmp = spectrum->input_tmp;
|
|
freqdata = spectrum->freqdata;
|
|
spect_magnitude = spectrum->spect_magnitude;
|
|
spect_phase = spectrum->spect_phase;
|
|
fft_ctx = spectrum->fft_ctx;
|
|
|
|
input_pos = spectrum->input_pos;
|
|
|
|
while (size >= width * channels) {
|
|
|
|
/* Move the current frame into our ringbuffer and
|
|
* take the average of all channels
|
|
*/
|
|
input[input_pos] = 0.0;
|
|
if (fp && width == 4) {
|
|
gfloat *in = (gfloat *) data;
|
|
for (i = 0; i < channels; i++)
|
|
input[input_pos] += in[i];
|
|
} else if (fp && width == 8) {
|
|
gdouble *in = (gdouble *) data;
|
|
for (i = 0; i < channels; i++)
|
|
input[input_pos] += in[i];
|
|
} else if (!fp && width == 4) {
|
|
gint32 *in = (gint32 *) data;
|
|
for (i = 0; i < channels; i++)
|
|
/* max_value will be 0 when depth is 1, interpret -1 and 0
|
|
* as -1 and +1 if that's the case.
|
|
*/
|
|
input[input_pos] += max_value ? in[i] / max_value : in[i] * 2 + 1;
|
|
} else if (!fp && width == 3) {
|
|
for (i = 0; i < channels; i++) {
|
|
#if G_BYTE_ORDER == G_BIG_ENDIAN
|
|
gint32 value = GST_READ_UINT24_BE (data);
|
|
#else
|
|
gint32 value = GST_READ_UINT24_LE (data);
|
|
#endif
|
|
if (value & 0x00800000)
|
|
value |= 0xff000000;
|
|
input[input_pos] += max_value ? value / max_value : value * 2 + 1;
|
|
}
|
|
} else if (!fp && width == 2) {
|
|
gint16 *in = (gint16 *) data;
|
|
for (i = 0; i < channels; i++)
|
|
input[input_pos] += max_value ? in[i] / max_value : in[i] * 2 + 1;
|
|
} else {
|
|
g_assert_not_reached ();
|
|
}
|
|
input[input_pos] /= channels;
|
|
|
|
data += width * channels;
|
|
size -= width * channels;
|
|
input_pos = (input_pos + 1) % nfft;
|
|
spectrum->num_frames++;
|
|
|
|
have_full_interval = (
|
|
(spectrum->accumulated_error < GST_SECOND
|
|
&& spectrum->num_frames == spectrum->frames_per_interval) ||
|
|
(spectrum->accumulated_error >= GST_SECOND
|
|
&& spectrum->num_frames - 1 == spectrum->frames_per_interval)
|
|
);
|
|
|
|
/* If we have enough frames for an FFT or we
|
|
* have all frames required for the interval run
|
|
* an FFT. In the last case we probably take the
|
|
* FFT of frames that we already handled.
|
|
*/
|
|
if ((spectrum->num_frames % nfft == 0) || have_full_interval) {
|
|
|
|
for (i = 0; i < nfft; i++)
|
|
input_tmp[i] = input[(input_pos + i) % nfft];
|
|
|
|
gst_fft_f32_window (fft_ctx, input_tmp, GST_FFT_WINDOW_HAMMING);
|
|
|
|
gst_fft_f32_fft (fft_ctx, input_tmp, freqdata);
|
|
spectrum->num_fft++;
|
|
|
|
if (spectrum->message_magnitude) {
|
|
gdouble val;
|
|
/* Calculate magnitude in db */
|
|
for (i = 0; i < bands; i++) {
|
|
val = freqdata[i].r * freqdata[i].r;
|
|
val += freqdata[i].i * freqdata[i].i;
|
|
val /= nfft * nfft;
|
|
val = 10.0 * log10 (val);
|
|
if (val < threshold)
|
|
val = threshold;
|
|
spect_magnitude[i] += val;
|
|
}
|
|
}
|
|
|
|
if (spectrum->message_phase) {
|
|
/* Calculate phase */
|
|
for (i = 0; i < bands; i++)
|
|
spect_phase[i] += atan2 (freqdata[i].i, freqdata[i].r);
|
|
}
|
|
}
|
|
|
|
/* Do we have the FFTs for one interval? */
|
|
if (have_full_interval) {
|
|
|
|
GST_INFO ("nfft: %u num_frames: %" G_GUINT64_FORMAT " fpi: %"
|
|
G_GUINT64_FORMAT " error: %" GST_TIME_FORMAT, nfft,
|
|
spectrum->num_frames, spectrum->frames_per_interval,
|
|
GST_TIME_ARGS (spectrum->accumulated_error));
|
|
|
|
if (spectrum->accumulated_error >= GST_SECOND)
|
|
spectrum->accumulated_error -= GST_SECOND;
|
|
else
|
|
spectrum->accumulated_error += spectrum->error_per_interval;
|
|
|
|
if (spectrum->post_messages) {
|
|
GstMessage *m;
|
|
|
|
/* Calculate average */
|
|
for (i = 0; i < bands; i++) {
|
|
spect_magnitude[i] /= spectrum->num_fft;
|
|
spect_phase[i] /= spectrum->num_fft;
|
|
}
|
|
|
|
m = gst_spectrum_message_new (spectrum, spectrum->message_ts,
|
|
spectrum->interval);
|
|
|
|
gst_element_post_message (GST_ELEMENT (spectrum), m);
|
|
}
|
|
|
|
if (GST_CLOCK_TIME_IS_VALID (spectrum->message_ts))
|
|
spectrum->message_ts +=
|
|
gst_util_uint64_scale (spectrum->num_frames, GST_SECOND, rate);
|
|
|
|
/* reset spectrum accumulators */
|
|
memset (spect_magnitude, 0, bands * sizeof (gfloat));
|
|
memset (spect_phase, 0, bands * sizeof (gfloat));
|
|
spectrum->num_frames = 0;
|
|
spectrum->num_fft = 0;
|
|
}
|
|
}
|
|
|
|
spectrum->input_pos = input_pos;
|
|
|
|
g_assert (size == 0);
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
static gboolean
|
|
plugin_init (GstPlugin * plugin)
|
|
{
|
|
return gst_element_register (plugin, "spectrum", GST_RANK_NONE,
|
|
GST_TYPE_SPECTRUM);
|
|
}
|
|
|
|
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
|
|
GST_VERSION_MINOR,
|
|
"spectrum",
|
|
"Run an FFT on the audio signal, output spectrum data",
|
|
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
|