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d0e08534ce
Original commit message from CVS: 2005-07-05 Andy Wingo <wingo@pobox.com> * Way, way, way too many files: Remove crack comment from the 2000 era.
218 lines
5.8 KiB
C
218 lines
5.8 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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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#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 "gstspectrum.h"
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/* elementfactory information */
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static GstElementDetails gst_spectrum_details =
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GST_ELEMENT_DETAILS ("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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/* Spectrum signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_WIDTH
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};
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static void gst_spectrum_base_init (gpointer g_class);
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static void gst_spectrum_class_init (GstSpectrumClass * klass);
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static void gst_spectrum_init (GstSpectrum * spectrum);
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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_chain (GstPad * pad, GstData * _data);
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#define fixed short
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int gst_spectrum_fix_fft (fixed fr[], fixed fi[], int m, int inverse);
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void gst_spectrum_fix_loud (fixed loud[], fixed fr[], fixed fi[], int n,
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int scale_shift);
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void gst_spectrum_window (fixed fr[], int n);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_spectrum_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_spectrum_get_type (void)
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{
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static GType spectrum_type = 0;
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if (!spectrum_type) {
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static const GTypeInfo spectrum_info = {
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sizeof (GstSpectrumClass),
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gst_spectrum_base_init,
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NULL,
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(GClassInitFunc) gst_spectrum_class_init,
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NULL,
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NULL,
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sizeof (GstSpectrum),
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0,
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(GInstanceInitFunc) gst_spectrum_init,
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};
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spectrum_type =
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g_type_register_static (GST_TYPE_ELEMENT, "GstSpectrum", &spectrum_info,
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0);
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}
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return spectrum_type;
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}
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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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gst_element_class_set_details (element_class, &gst_spectrum_details);
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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;
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gobject_class = (GObjectClass *) klass;
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parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
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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 */
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gobject_class->set_property = gst_spectrum_set_property;
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}
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static void
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gst_spectrum_init (GstSpectrum * spectrum)
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{
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spectrum->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
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gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->sinkpad);
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gst_pad_set_chain_function (spectrum->sinkpad, gst_spectrum_chain);
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spectrum->srcpad = gst_pad_new ("src", GST_PAD_SRC);
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gst_element_add_pad (GST_ELEMENT (spectrum), spectrum->srcpad);
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spectrum->width = 75;
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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 *spectrum;
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g_return_if_fail (GST_IS_SPECTRUM (object));
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spectrum = GST_SPECTRUM (object);
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switch (prop_id) {
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case ARG_WIDTH:
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spectrum->width = g_value_get_int (value);
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break;
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default:
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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_chain (GstPad * pad, GstData * _data)
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{
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GstBuffer *buf = GST_BUFFER (_data);
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GstSpectrum *spectrum;
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gint spec_base, spec_len;
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gint16 *re, *im, *loud;
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gint16 *samples;
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gint step, pos, i;
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guchar *spect;
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GstBuffer *newbuf;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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g_return_if_fail (buf != NULL);
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spectrum = GST_SPECTRUM (GST_OBJECT_PARENT (pad));
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samples = (gint16 *) GST_BUFFER_DATA (buf);
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spec_base = 8;
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spec_len = 1024;
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im = g_malloc (spec_len * sizeof (gint16));
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g_return_if_fail (im != NULL);
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loud = g_malloc (spec_len * sizeof (gint16));
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g_return_if_fail (loud != NULL);
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memset (im, 0, spec_len * sizeof (gint16));
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/*if (spectrum->meta->channels == 2) { */
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re = g_malloc (spec_len * sizeof (gint16));
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for (i = 0; i < spec_len; i++)
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re[i] = (samples[(i * 2)] + samples[(i * 2) + 1]) >> 1;
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/*} else */
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/* re = samples; */
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gst_spectrum_window (re, spec_len);
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gst_spectrum_fix_fft (re, im, spec_base, FALSE);
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gst_spectrum_fix_loud (loud, re, im, spec_len, 0);
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if (re != samples)
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g_free (re);
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g_free (im);
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step = spec_len / (spectrum->width * 2);
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spect = (guchar *) g_malloc (spectrum->width);
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for (i = 0, pos = 0; i < spectrum->width; i++, pos += step) {
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if (loud[pos] > -60)
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spect[i] = (loud[pos] + 60) / 2;
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else
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spect[i] = 0;
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/* if (spect[i] > 15); */
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/* spect[i] = 15; */
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}
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g_free (loud);
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gst_buffer_unref (buf);
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/* g_free(samples); */
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newbuf = gst_buffer_new ();
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g_return_if_fail (newbuf != NULL);
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GST_BUFFER_DATA (newbuf) = spect;
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GST_BUFFER_SIZE (newbuf) = spectrum->width;
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gst_pad_push (spectrum->srcpad, GST_DATA (newbuf));
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "spectrum", GST_RANK_NONE,
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GST_TYPE_SPECTRUM);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"spectrum",
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"Run an FFT on the audio signal, output spectrum data",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)
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