/* GStreamer * Copyright (C) <1999> Erik Walthinsen * <2006> Stefan Kost * * 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. */ /** * SECTION:element-spectrum * * * The Spectrum element analyzes the frequency spectrum of an audio signal. * Analysis results are send as outgoing buffers. * The buffer contains a guint8 value per frequency band. * A value of 0 maps to the threshold property. * * It cannot be used with the gst-launch command in a sensible way. Instead the * included demo shows how to use it. * * Last reviewed on 2006-05-21 (0.10.3) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstspectrum.h" GST_DEBUG_CATEGORY_STATIC (gst_spectrum_debug); #define GST_CAT_DEFAULT gst_spectrum_debug /* elementfactory information */ static const GstElementDetails gst_spectrum_details = GST_ELEMENT_DETAILS ("Spectrum analyzer", "Filter/Analyzer/Audio", "Run an FFT on the audio signal, output spectrum data", "Erik Walthinsen ," "Stefan Kost "); static GstStaticPadTemplate sink_template_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw-int, " "rate = (int) [ 1, MAX ], " "channels = (int) [1, MAX], " "endianness = (int) BYTE_ORDER, " "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true") ); static GstStaticPadTemplate src_template_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); /* Spectrum signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0, ARG_WIDTH, ARG_THRESHOLD }; static void gst_spectrum_base_init (gpointer g_class); static void gst_spectrum_class_init (GstSpectrumClass * klass); static void gst_spectrum_init (GstSpectrum * spectrum); static void gst_spectrum_dispose (GObject * object); static void gst_spectrum_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static gboolean gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps); static GstCaps *gst_spectrum_get_sink_caps (GstPad * pad); static GstFlowReturn gst_spectrum_chain (GstPad * pad, GstBuffer * buffer); static GstStateChangeReturn gst_spectrum_change_state (GstElement * element, GstStateChange transition); #define fixed short extern int gst_spectrum_fix_fft (fixed fr[], fixed fi[], int m, int inverse); extern void gst_spectrum_fix_loud (fixed loud[], fixed fr[], fixed fi[], int n, int scale_shift); extern void gst_spectrum_window (fixed fr[], int n); static GstElementClass *parent_class = NULL; /*static guint gst_spectrum_signals[LAST_SIGNAL] = { 0 }; */ GType gst_spectrum_get_type (void) { static GType spectrum_type = 0; if (!spectrum_type) { static const GTypeInfo spectrum_info = { sizeof (GstSpectrumClass), gst_spectrum_base_init, NULL, (GClassInitFunc) gst_spectrum_class_init, NULL, NULL, sizeof (GstSpectrum), 0, (GInstanceInitFunc) gst_spectrum_init, }; spectrum_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSpectrum", &spectrum_info, 0); GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0, "audio spectrum analyser element"); } return spectrum_type; } static void gst_spectrum_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_template_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_template_factory)); gst_element_class_set_details (element_class, &gst_spectrum_details); } static void gst_spectrum_class_init (GstSpectrumClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *element = GST_ELEMENT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); gobject_class->set_property = gst_spectrum_set_property; gobject_class->dispose = gst_spectrum_dispose; element->change_state = gst_spectrum_change_state; g_object_class_install_property (gobject_class, ARG_WIDTH, g_param_spec_uint ("width", "width", "number of frequency bands", 0, G_MAXUINT, 0, G_PARAM_WRITABLE)); g_object_class_install_property (gobject_class, ARG_THRESHOLD, g_param_spec_int ("threshold", "threshold", "db threshold for result, maps to 0", G_MININT, 0, -60, G_PARAM_WRITABLE)); } static void gst_spectrum_init (GstSpectrum * spectrum) { spectrum->sinkpad = gst_pad_new_from_static_template (&sink_template_factory, "sink"); gst_pad_set_chain_function (spectrum->sinkpad, gst_spectrum_chain); gst_pad_set_setcaps_function (spectrum->sinkpad, gst_spectrum_set_sink_caps); gst_pad_set_getcaps_function (spectrum->sinkpad, gst_spectrum_get_sink_caps); gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->sinkpad); spectrum->srcpad = gst_pad_new_from_static_template (&src_template_factory, "src"); gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->srcpad); spectrum->adapter = gst_adapter_new (); spectrum->width = 128; spectrum->base = 9; spectrum->len = 1024; /* 2 ^ (base+1) */ spectrum->loud = g_malloc (spectrum->len * sizeof (gint16)); spectrum->im = g_malloc (spectrum->len * sizeof (gint16)); memset (spectrum->im, 0, spectrum->len * sizeof (gint16)); spectrum->re = g_malloc (spectrum->len * sizeof (gint16)); memset (spectrum->re, 0, spectrum->len * sizeof (gint16)); } static void gst_spectrum_dispose (GObject * object) { GstSpectrum *spectrum = GST_SPECTRUM (object); if (spectrum->adapter) { g_object_unref (spectrum->adapter); spectrum->adapter = NULL; } g_free (spectrum->re); g_free (spectrum->im); g_free (spectrum->loud); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_spectrum_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSpectrum *spectrum = GST_SPECTRUM (object); switch (prop_id) { case ARG_WIDTH: spectrum->width = g_value_get_uint (value); break; case ARG_THRESHOLD: spectrum->threshold = g_value_get_int (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_spectrum_set_sink_caps (GstPad * pad, GstCaps * caps) { GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); GstStructure *structure = gst_caps_get_structure (caps, 0); gboolean ret; ret = gst_structure_get_int (structure, "channels", &spectrum->channels); GST_INFO ("Got channels = %d", spectrum->channels); gst_object_unref (spectrum); return ret; } static GstCaps * gst_spectrum_get_sink_caps (GstPad * pad) { GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); GstCaps *res; GstStructure *structure; res = gst_caps_copy (gst_pad_get_pad_template_caps (spectrum->sinkpad)); if (spectrum->channels) { structure = gst_caps_get_structure (res, 0); gst_structure_set (structure, "channels", G_TYPE_INT, spectrum->channels, NULL); GST_INFO ("Fixate channels = %d", spectrum->channels); } gst_object_unref (spectrum); return res; } static GstFlowReturn gst_spectrum_chain (GstPad * pad, GstBuffer * buffer) { GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad)); gint16 *samples; gint wanted; gint i, j, k; gint32 acc; gfloat pos, step; guchar *spect; GstBuffer *outbuf; GstFlowReturn ret = GST_FLOW_OK; gst_adapter_push (spectrum->adapter, buffer); /* required number of bytes */ wanted = spectrum->channels * spectrum->len * 2; /* FIXME: 4.0 was 2.0 before, but that include the mirrored spectrum */ step = (gfloat) spectrum->len / (spectrum->width * 4.0); while (gst_adapter_available (spectrum->adapter) > wanted && (ret == GST_FLOW_OK)) { samples = (gint16 *) gst_adapter_take (spectrum->adapter, wanted); for (i = 0, j = 0; i < spectrum->len; i++) { for (k = 0, acc = 0; k < spectrum->channels; k++) acc += samples[j++]; spectrum->re[i] = (gint16) (acc / spectrum->channels); } gst_spectrum_window (spectrum->re, spectrum->len); gst_spectrum_fix_fft (spectrum->re, spectrum->im, spectrum->base, FALSE); gst_spectrum_fix_loud (spectrum->loud, spectrum->re, spectrum->im, spectrum->len, 0); ret = gst_pad_alloc_buffer_and_set_caps (spectrum->srcpad, GST_BUFFER_OFFSET_NONE, spectrum->width, GST_PAD_CAPS (spectrum->srcpad), &outbuf); /* resample to requested width */ spect = GST_BUFFER_DATA (outbuf); for (i = 0, pos = 0.0; i < spectrum->width; i++, pos += step) { /* > -60 db? FIXME: make this a gobject property */ if (spectrum->loud[(gint) pos] > spectrum->threshold) { spect[i] = spectrum->loud[(gint) pos] - spectrum->threshold; /* if (spect[i] > 15); spect[i] = 15; */ } else /* treat as silence */ spect[i] = 0; } ret = gst_pad_push (spectrum->srcpad, outbuf); } gst_object_unref (spectrum); return ret; } static GstStateChangeReturn gst_spectrum_change_state (GstElement * element, GstStateChange transition) { GstSpectrum *spectrum = GST_SPECTRUM (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_adapter_clear (spectrum->adapter); break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PLAYING_TO_PAUSED: break; case GST_STATE_CHANGE_PAUSED_TO_READY: break; case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } return ret; } 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)