Initial revision

Original commit message from CVS:
Initial revision

1 files changed, 242 insertions, 0 deletions

diff --git a/gst/spectrum/gstspectrum.c b/gst/spectrum/gstspectrum.c
new file mode 100644
index 00000000..0821545c
--- /dev/null
+++ b/gst/spectrum/gstspectrum.c
@@ -0,0 +1,242 @@
+/* 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
+};