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-rw-r--r--gst/spectrum/gstspectrum.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/gst/spectrum/gstspectrum.c b/gst/spectrum/gstspectrum.c
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+++ b/gst/spectrum/gstspectrum.c
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+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#include <string.h>
+
+#include "gstspectrum.h"
+
+static GstElementDetails gst_spectrum_details = {
+ "Spectrum analyzer",
+ "Filter/Analysis",
+ "Run an FFT on the audio signal, output spectrum data",
+ VERSION,
+ "Erik Walthinsen <omega@cse.ogi.edu>",
+ "(C) 1999",
+};
+
+
+static GstTypeDefinition spectrumdefinition = {
+ "spectrum_spectrum_raw",
+ "spectrum/raw",
+ NULL,
+ NULL,
+};
+
+
+/* Spectrum signals and args */
+enum {
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum {
+ ARG_0,
+ ARG_WIDTH,
+};
+
+
+static void gst_spectrum_class_init (GstSpectrumClass *klass);
+static void gst_spectrum_init (GstSpectrum *spectrum);
+
+static void gst_spectrum_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+
+static void gst_spectrum_chain (GstPad *pad, GstBuffer *buf);
+
+#define fixed short
+int gst_spectrum_fix_fft(fixed fr[], fixed fi[], int m, int inverse);
+void gst_spectrum_fix_loud(fixed loud[], fixed fr[], fixed fi[], int n, int scale_shift);
+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), NULL,
+ 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);
+ }
+ return spectrum_type;
+}
+
+static void
+gst_spectrum_class_init (GstSpectrumClass *klass)
+{
+ GObjectClass *gobject_class;
+
+ gobject_class = (GObjectClass*)klass;
+
+ parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+ g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_WIDTH,
+ g_param_spec_int("width","width","width",
+ G_MININT,G_MAXINT,0,G_PARAM_WRITABLE)); // CHECKME
+
+ gobject_class->set_property = gst_spectrum_set_property;
+}
+
+static void
+gst_spectrum_init (GstSpectrum *spectrum)
+{
+ spectrum->sinkpad = gst_pad_new("sink",GST_PAD_SINK);
+ gst_element_add_pad(GST_ELEMENT(spectrum),spectrum->sinkpad);
+ gst_pad_set_chain_function(spectrum->sinkpad,gst_spectrum_chain);
+ spectrum->srcpad = gst_pad_new("src",GST_PAD_SRC);
+ gst_element_add_pad(GST_ELEMENT(spectrum),spectrum->srcpad);
+
+ spectrum->width = 75;
+}
+
+static void
+gst_spectrum_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+ GstSpectrum *spectrum;
+
+ /* it's not null if we got it, but it might not be ours */
+ g_return_if_fail(GST_IS_SPECTRUM(object));
+ spectrum = GST_SPECTRUM(object);
+
+ switch (prop_id) {
+ case ARG_WIDTH:
+ spectrum->width = g_value_get_int (value);
+ break;
+ default:
+ break;
+ }
+}
+
+static void
+gst_spectrum_chain (GstPad *pad, GstBuffer *buf)
+{
+ GstSpectrum *spectrum;
+ gint spec_base, spec_len;
+ gint16 *re, *im, *loud;
+ gint16 *samples;
+ gint samplecount,step,pos,i;
+ guchar *spect;
+ GstBuffer *newbuf;
+
+ g_return_if_fail(pad != NULL);
+ g_return_if_fail(GST_IS_PAD(pad));
+ g_return_if_fail(buf != NULL);
+
+ spectrum = GST_SPECTRUM (GST_OBJECT_PARENT (pad));
+
+ /* first deal with audio metadata */
+// FIXME
+// if (buf->meta) {
+// if (spectrum->meta != NULL) {
+// /* FIXME: need to unref the old metadata so it goes away */
+// }
+// /* we just make a copy of the pointer */
+// spectrum->meta = (MetaAudioRaw *)(buf->data);
+// /* FIXME: now we have to ref the metadata so it does go away */
+// }
+
+ //g_return_if_fail(spectrum->meta != NULL);
+
+ //samplecount = GST_BUFFER_SIZE(buf) /
+ // (spectrum->meta->channels * sizeof(gint16));
+// samples = (gint16 *)g_malloc(buf->datasize);
+// g_return_if_fail(samples != NULL);
+// memcpy(samples,(gint16
+//*)GST_BUFFER_DATA(buf),GST_BUFFER_DATASIZE(buf));
+// gst_buffer_unref(buf);
+ samples = (gint16 *)GST_BUFFER_DATA(buf);
+
+// return;
+// spec_base = (gint) (log(samplecount) / log(2));
+// if (spec_base > 10) spec_base = 10;
+// spec_len = (gint) pow(2, spec_base);
+ spec_base = 8;
+ spec_len = 1024;
+
+ im = g_malloc(spec_len * sizeof(gint16));
+ g_return_if_fail(im != NULL);
+ loud = g_malloc(spec_len * sizeof(gint16));
+ g_return_if_fail(loud != NULL);
+
+ memset(im,0,spec_len * sizeof(gint16));
+ //if (spectrum->meta->channels == 2) {
+ re = g_malloc(spec_len * sizeof(gint16));
+ for (i=0;i<spec_len;i++)
+ re[i] = (samples[(i*2)] + samples[(i*2)+1]) >> 1;
+ //} else
+ // re = samples;
+ gst_spectrum_window(re,spec_len);
+ gst_spectrum_fix_fft(re,im,spec_base,FALSE);
+ gst_spectrum_fix_loud(loud,re,im,spec_len,0);
+ if (re != samples) g_free(re);
+ g_free(im);
+ step = spec_len / (spectrum->width*2);
+ spect = (guchar *)g_malloc(spectrum->width);
+ for (i=0,pos=0;i<spectrum->width;i++,pos += step) {
+ if (loud[pos] > -60)
+ spect[i] = (loud[pos] + 60) / 2;
+ else
+ spect[i] = 0;
+// if (spect[i] > 15);
+// spect[i] = 15;
+ }
+ g_free(loud);
+ gst_buffer_unref(buf);
+// g_free(samples);
+
+ newbuf = gst_buffer_new();
+ g_return_if_fail(newbuf != NULL);
+ GST_BUFFER_DATA(newbuf) = spect;
+ GST_BUFFER_SIZE(newbuf) = spectrum->width;
+
+ gst_pad_push(spectrum->srcpad,newbuf);
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+ GstElementFactory *factory;
+
+ /* create an elementfactory for the spectrum element */
+ factory = gst_elementfactory_new ("spectrum",GST_TYPE_SPECTRUM,
+ &gst_spectrum_details);
+ g_return_val_if_fail (factory != NULL, FALSE);
+
+ gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+ return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+ GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "spectrum",
+ plugin_init
+};
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