gstreamer/gst/spectrum/gstspectrum.c
Stefan Kost d440cf33c6 gst/spectrum/gstspectrum.c: Use boilerplate macro, fix strings to match plugin-moval-requirements
Original commit message from CVS:
* gst/spectrum/gstspectrum.c: (gst_spectrum_class_init),
(gst_spectrum_init), (gst_spectrum_set_sink_caps),
(gst_spectrum_get_sink_caps), (gst_spectrum_chain):
Use boilerplate macro, fix strings to match plugin-moval-requirements
2006-05-21 16:41:44 +00:00

343 lines
10 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2006> Stefan Kost <ensonic@users.sf.net>
*
* 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
*
* <refsect2>
* 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 <string.h>
#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 <omega@cse.ogi.edu>, "
"Stefan Kost <ensonic@users.sf.net>");
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
};
GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstElement, GST_TYPE_ELEMENT);
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 guint gst_spectrum_signals[LAST_SIGNAL] = { 0 }; */
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);
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));
GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
"audio spectrum analyser element");
}
static void
gst_spectrum_init (GstSpectrum * spectrum, GstSpectrumClass * g_class)
{
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)