gstreamer/gst/spectrum/gstspectrum.c

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/* GStreamer
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstspectrum.h"
/* elementfactory information */
static GstElementDetails gst_spectrum_details =
GST_ELEMENT_DETAILS ("Spectrum analyzer",
"Filter/Analyzer/Audio",
"Run an FFT on the audio signal, output spectrum data",
"Erik Walthinsen <omega@cse.ogi.edu>");
/* Spectrum signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_WIDTH
};
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_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_spectrum_chain (GstPad * pad, GstData * _data);
#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),
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);
}
return spectrum_type;
}
static void
gst_spectrum_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &gst_spectrum_details);
}
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, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
GstSpectrum *spectrum;
gint spec_base, spec_len;
gint16 *re, *im, *loud;
gint16 *samples;
gint 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));
samples = (gint16 *) GST_BUFFER_DATA (buf);
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, GST_DATA (newbuf));
}
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, GST_ORIGIN)