gstreamer/gst/spectrum/gstspectrum.c
Sebastian Dröge 015dc9060f gst/: Change the meaning of the magnitude values given in the
Original commit message from CVS:
* gst/equalizer/demo.c: (draw_spectrum):
* gst/spectrum/demo-audiotest.c: (draw_spectrum):
* gst/spectrum/demo-osssrc.c: (draw_spectrum):
* gst/spectrum/gstspectrum.c: (gst_spectrum_class_init):
Change the meaning of the magnitude values given in the
GstMessages by spectrum to decibel instead of
decibel+threshold.
2007-11-11 21:12:10 +00:00

677 lines
22 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2006> Stefan Kost <ensonic@users.sf.net>
* <2007> Sebastian Dröge <slomo@circular-chaos.org>
*
* 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.
* If <link linkend="GstSpectrum--message">message property</link> is #TRUE it
* sends analysis results as application message named
* <classname>&quot;spectrum&quot;</classname> after each interval of time given
* by the <link linkend="GstSpectrum--interval">interval property</link>.
* The message's structure contains two fields:
* <itemizedlist>
* <listitem>
* <para>
* #GstClockTime
* <classname>&quot;endtime&quot;</classname>:
* the end time of the buffer that triggered the message
* </para>
* </listitem>
* <listitem>
* <para>
* #GstValueList of #gfloat
* <classname>&quot;magnitude&quot;</classname>:
* the level for each frequency band in dB. All values below the value of the
* <link linkend="GstSpectrum--threshold">threshold property</link> will
* be set to the threshold.
* </para>
* </listitem>
* <listitem>
* <para>
* #GstValueList of #gfloat
* <classname>&quot;phase&quot;</classname>:
* the phase for each frequency band. The value is between -pi and pi.
* </para>
* </listitem>
*
* This element cannot be used with the gst-launch command in a sensible way.
* The included demo shows how to use it in an application.
*
* Last reviewed on 2007-11-11 (0.10.6)
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <math.h>
#include "gstspectrum.h"
#include <gst/fft/gstfft.h>
#include <gst/fft/gstffts16.h>
#include <gst/fft/gstffts32.h>
#include <gst/fft/gstfftf32.h>
#include <gst/fft/gstfftf64.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>, "
"Sebastian Dröge <slomo@circular-chaos.org>");
#define ALLOWED_CAPS \
"audio/x-raw-int, " \
" width = (int) 16, " \
" depth = (int) 16, " \
" signed = (boolean) true, " \
" endianness = (int) BYTE_ORDER, " \
" rate = (int) [ 1, MAX ], " \
" channels = (int) [ 1, MAX ]; " \
"audio/x-raw-int, " \
" width = (int) 32, " \
" depth = (int) 32, " \
" signed = (boolean) true, " \
" endianness = (int) BYTE_ORDER, " \
" rate = (int) [ 1, MAX ], " \
" channels = (int) [ 1, MAX ]; " \
"audio/x-raw-float, " \
" width = (int) { 32, 64 }, " \
" endianness = (int) BYTE_ORDER, " \
" rate = (int) [ 1, MAX ], " \
" channels = (int) [ 1, MAX ]"
/* Spectrum properties */
#define DEFAULT_SIGNAL_SPECTRUM TRUE
#define DEFAULT_SIGNAL_MAGNITUDE TRUE
#define DEFAULT_SIGNAL_PHASE FALSE
#define DEFAULT_SIGNAL_INTERVAL (GST_SECOND / 10)
#define DEFAULT_BANDS 128
#define DEFAULT_THRESHOLD -60
#define SPECTRUM_WINDOW_BASE 9
#define SPECTRUM_WINDOW_LEN (1 << (SPECTRUM_WINDOW_BASE+1))
enum
{
PROP_0,
PROP_SIGNAL_SPECTRUM,
PROP_SIGNAL_MAGNITUDE,
PROP_SIGNAL_PHASE,
PROP_SIGNAL_INTERVAL,
PROP_BANDS,
PROP_THRESHOLD
};
GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstAudioFilter,
GST_TYPE_AUDIO_FILTER);
static void gst_spectrum_dispose (GObject * object);
static void gst_spectrum_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_spectrum_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_spectrum_start (GstBaseTransform * trans);
static gboolean gst_spectrum_stop (GstBaseTransform * trans);
static gboolean gst_spectrum_event (GstBaseTransform * trans, GstEvent * event);
static GstFlowReturn gst_spectrum_transform_ip (GstBaseTransform * trans,
GstBuffer * in);
static gboolean gst_spectrum_setup (GstAudioFilter * base,
GstRingBufferSpec * format);
static void process_s16 (GstSpectrum * spectrum, const gint16 * samples);
static void process_s32 (GstSpectrum * spectrum, const gint32 * samples);
static void process_f32 (GstSpectrum * spectrum, const gfloat * samples);
static void process_f64 (GstSpectrum * spectrum, const gdouble * samples);
static void
gst_spectrum_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstCaps *caps;
gst_element_class_set_details (element_class, &gst_spectrum_details);
caps = gst_caps_from_string (ALLOWED_CAPS);
gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (g_class),
caps);
gst_caps_unref (caps);
}
static void
gst_spectrum_class_init (GstSpectrumClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
GstAudioFilterClass *filter_class = GST_AUDIO_FILTER_CLASS (klass);
gobject_class->set_property = gst_spectrum_set_property;
gobject_class->get_property = gst_spectrum_get_property;
gobject_class->dispose = gst_spectrum_dispose;
trans_class->start = GST_DEBUG_FUNCPTR (gst_spectrum_start);
trans_class->stop = GST_DEBUG_FUNCPTR (gst_spectrum_stop);
trans_class->event = GST_DEBUG_FUNCPTR (gst_spectrum_event);
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_spectrum_transform_ip);
trans_class->passthrough_on_same_caps = TRUE;
filter_class->setup = GST_DEBUG_FUNCPTR (gst_spectrum_setup);
g_object_class_install_property (gobject_class, PROP_SIGNAL_SPECTRUM,
g_param_spec_boolean ("message", "Message",
"Post a level message for each passed interval",
DEFAULT_SIGNAL_SPECTRUM, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SIGNAL_MAGNITUDE,
g_param_spec_boolean ("message-magnitude", "Magnitude",
"Post the magnitude of the spectrum",
DEFAULT_SIGNAL_MAGNITUDE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SIGNAL_PHASE,
g_param_spec_boolean ("message-phase", "Phase",
"Post the phase of the spectrum",
DEFAULT_SIGNAL_PHASE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SIGNAL_INTERVAL,
g_param_spec_uint64 ("interval", "Interval",
"Interval of time between message posts (in nanoseconds)",
1, G_MAXUINT64, DEFAULT_SIGNAL_INTERVAL, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_BANDS,
g_param_spec_uint ("bands", "Bands", "number of frequency bands",
0, G_MAXUINT, DEFAULT_BANDS, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_THRESHOLD,
g_param_spec_int ("threshold", "Threshold",
"dB threshold for result. All lower values will be set to this",
G_MININT, 0, DEFAULT_THRESHOLD, G_PARAM_READWRITE));
GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
"audio spectrum analyser element");
}
static void
gst_spectrum_init (GstSpectrum * spectrum, GstSpectrumClass * g_class)
{
spectrum->adapter = gst_adapter_new ();
spectrum->message = DEFAULT_SIGNAL_SPECTRUM;
spectrum->message_magnitude = DEFAULT_SIGNAL_MAGNITUDE;
spectrum->message_phase = DEFAULT_SIGNAL_PHASE;
spectrum->interval = DEFAULT_SIGNAL_INTERVAL;
spectrum->bands = DEFAULT_BANDS;
spectrum->threshold = DEFAULT_THRESHOLD;
spectrum->spect_magnitude = g_new0 (gfloat, spectrum->bands);
spectrum->spect_phase = g_new0 (gfloat, spectrum->bands);
}
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->in);
if (spectrum->fft_free_func) {
spectrum->fft_free_func (spectrum->fft_ctx);
spectrum->fft_ctx = NULL;
spectrum->fft_free_func = NULL;
}
g_free (spectrum->freqdata);
g_free (spectrum->spect_magnitude);
g_free (spectrum->spect_phase);
spectrum->in = NULL;
spectrum->spect_magnitude = NULL;
spectrum->spect_phase = NULL;
spectrum->freqdata = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_spectrum_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSpectrum *filter = GST_SPECTRUM (object);
switch (prop_id) {
case PROP_SIGNAL_SPECTRUM:
filter->message = g_value_get_boolean (value);
break;
case PROP_SIGNAL_MAGNITUDE:
filter->message_magnitude = g_value_get_boolean (value);
break;
case PROP_SIGNAL_PHASE:
filter->message_phase = g_value_get_boolean (value);
break;
case PROP_SIGNAL_INTERVAL:
filter->interval = g_value_get_uint64 (value);
break;
case PROP_BANDS:
GST_BASE_TRANSFORM_LOCK (filter);
filter->bands = g_value_get_uint (value);
g_free (filter->spect_magnitude);
g_free (filter->spect_phase);
g_free (filter->in);
g_free (filter->freqdata);
if (filter->fft_free_func) {
filter->fft_free_func (filter->fft_ctx);
filter->fft_ctx = NULL;
filter->fft_free_func = NULL;
}
filter->in = NULL;
filter->freqdata = NULL;
filter->spect_magnitude = g_new0 (gfloat, filter->bands);
filter->spect_phase = g_new0 (gfloat, filter->bands);
filter->num_frames = 0;
filter->num_fft = 0;
GST_BASE_TRANSFORM_UNLOCK (filter);
GST_DEBUG_OBJECT (filter, "reallocation, spect = %p, bands =%d ",
filter->spect_magnitude, filter->bands);
break;
case PROP_THRESHOLD:
filter->threshold = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_spectrum_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSpectrum *filter = GST_SPECTRUM (object);
switch (prop_id) {
case PROP_SIGNAL_SPECTRUM:
g_value_set_boolean (value, filter->message);
break;
case PROP_SIGNAL_MAGNITUDE:
g_value_set_boolean (value, filter->message_magnitude);
break;
case PROP_SIGNAL_PHASE:
g_value_set_boolean (value, filter->message_phase);
break;
case PROP_SIGNAL_INTERVAL:
g_value_set_uint64 (value, filter->interval);
break;
case PROP_BANDS:
g_value_set_uint (value, filter->bands);
break;
case PROP_THRESHOLD:
g_value_set_int (value, filter->threshold);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_spectrum_start (GstBaseTransform * trans)
{
GstSpectrum *filter = GST_SPECTRUM (trans);
filter->num_frames = 0;
filter->num_fft = 0;
if (filter->spect_magnitude)
memset (filter->spect_magnitude, 0, filter->bands * sizeof (gfloat));
if (filter->spect_phase)
memset (filter->spect_phase, 0, filter->bands * sizeof (gfloat));
return TRUE;
}
static gboolean
gst_spectrum_stop (GstBaseTransform * trans)
{
GstSpectrum *filter = GST_SPECTRUM (trans);
gst_adapter_clear (filter->adapter);
return TRUE;
}
static gboolean
gst_spectrum_event (GstBaseTransform * trans, GstEvent * event)
{
GstSpectrum *filter = GST_SPECTRUM (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
case GST_EVENT_EOS:
gst_adapter_clear (filter->adapter);
break;
default:
break;
}
return TRUE;
}
static gboolean
gst_spectrum_setup (GstAudioFilter * base, GstRingBufferSpec * format)
{
GstSpectrum *filter = GST_SPECTRUM (base);
if (filter->in) {
g_free (filter->in);
filter->in = NULL;
}
if (filter->fft_free_func) {
filter->fft_free_func (filter->fft_ctx);
filter->fft_ctx = NULL;
filter->fft_free_func = NULL;
}
if (filter->freqdata) {
g_free (filter->freqdata);
filter->freqdata = NULL;
}
if (format->type == GST_BUFTYPE_LINEAR && format->width == 32)
filter->process = (GstSpectrumProcessFunc) process_s32;
else if (format->type == GST_BUFTYPE_LINEAR && format->width == 16)
filter->process = (GstSpectrumProcessFunc) process_s16;
else if (format->type == GST_BUFTYPE_FLOAT && format->width == 64)
filter->process = (GstSpectrumProcessFunc) process_f64;
else if (format->type == GST_BUFTYPE_FLOAT && format->width == 32)
filter->process = (GstSpectrumProcessFunc) process_f32;
else
g_assert_not_reached ();
return TRUE;
}
static GstMessage *
gst_spectrum_message_new (GstSpectrum * spectrum, GstClockTime endtime)
{
GstStructure *s;
GValue v = { 0, };
GValue *l;
guint i;
gfloat *spect_magnitude = spectrum->spect_magnitude;
gfloat *spect_phase = spectrum->spect_phase;
GST_DEBUG_OBJECT (spectrum, "preparing message, spect = %p, bands =%d ",
spect_magnitude, spectrum->bands);
s = gst_structure_new ("spectrum", "endtime", GST_TYPE_CLOCK_TIME,
endtime, NULL);
if (spectrum->message_magnitude) {
g_value_init (&v, GST_TYPE_LIST);
/* will copy-by-value */
gst_structure_set_value (s, "magnitude", &v);
g_value_unset (&v);
g_value_init (&v, G_TYPE_FLOAT);
l = (GValue *) gst_structure_get_value (s, "magnitude");
for (i = 0; i < spectrum->bands; i++) {
g_value_set_float (&v, spect_magnitude[i]);
gst_value_list_append_value (l, &v); /* copies by value */
}
g_value_unset (&v);
}
if (spectrum->message_phase) {
g_value_init (&v, GST_TYPE_LIST);
/* will copy-by-value */
gst_structure_set_value (s, "phase", &v);
g_value_unset (&v);
g_value_init (&v, G_TYPE_FLOAT);
l = (GValue *) gst_structure_get_value (s, "phase");
for (i = 0; i < spectrum->bands; i++) {
g_value_set_float (&v, spect_phase[i]);
gst_value_list_append_value (l, &v); /* copies by value */
}
g_value_unset (&v);
}
return gst_message_new_element (GST_OBJECT (spectrum), s);
}
#define DEFINE_PROCESS_FUNC_INT(width,next_width,max) \
static void \
process_s##width (GstSpectrum *spectrum, const gint##width *samples) \
{ \
gfloat *spect_magnitude = spectrum->spect_magnitude; \
gfloat *spect_phase = spectrum->spect_phase; \
gint channels = GST_AUDIO_FILTER (spectrum)->format.channels; \
gint i, j, k; \
gint##next_width acc; \
GstFFTS##width##Complex *freqdata; \
GstFFTS##width *ctx; \
gint##width *in; \
gint nfft = 2 * spectrum->bands - 2; \
\
if (!spectrum->in) \
spectrum->in = (guint8 *) g_new (gint##width, nfft); \
\
in = (gint##width *) spectrum->in; \
\
for (i = 0, j = 0; i < nfft; i++) { \
/* convert to mono */ \
for (k = 0, acc = 0; k < channels; k++) \
acc += samples[j++]; \
in[i] = (gint##width) (acc / channels); \
} \
\
if (!spectrum->fft_ctx) { \
spectrum->fft_ctx = gst_fft_s##width##_new (nfft, FALSE); \
spectrum->fft_free_func = (GstSpectrumFFTFreeFunc) gst_fft_s##width##_free; \
} \
ctx = spectrum->fft_ctx; \
\
gst_fft_s##width##_window (ctx, in, GST_FFT_WINDOW_HAMMING); \
\
if (!spectrum->freqdata) \
spectrum->freqdata = g_new (GstFFTS##width##Complex, spectrum->bands); \
\
freqdata = (GstFFTS##width##Complex *) spectrum->freqdata; \
\
gst_fft_s##width##_fft (ctx, in, freqdata); \
spectrum->num_fft++; \
\
/* Calculate magnitude in db */ \
for (i = 0; i < spectrum->bands; i++) { \
gdouble val = 0.0; \
val = (gdouble) freqdata[i].r * (gdouble) freqdata[i].r; \
val += (gdouble) freqdata[i].i * (gdouble) freqdata[i].i; \
val /= max*max; \
val = 10.0 * log10 (val); \
if (val < spectrum->threshold) \
val = spectrum->threshold; \
spect_magnitude[i] += val; \
} \
\
/* Calculate phase */ \
for (i = 0; i < spectrum->bands; i++) \
spect_phase[i] += atan2 (freqdata[i].i, freqdata[i].r); \
\
}
DEFINE_PROCESS_FUNC_INT (16, 32, 32767.0);
DEFINE_PROCESS_FUNC_INT (32, 64, 2147483647.0);
#define DEFINE_PROCESS_FUNC_FLOAT(width,type) \
static void \
process_f##width (GstSpectrum *spectrum, const g##type *samples) \
{ \
gfloat *spect_magnitude = spectrum->spect_magnitude; \
gfloat *spect_phase = spectrum->spect_phase; \
gint channels = GST_AUDIO_FILTER (spectrum)->format.channels; \
gint i, j, k; \
g##type acc; \
GstFFTF##width##Complex *freqdata; \
GstFFTF##width *ctx; \
g##type *in; \
gint nfft = 2 * spectrum->bands - 2; \
\
if (!spectrum->in) \
spectrum->in = (guint8 *) g_new (g##type, nfft); \
\
in = (g##type *) spectrum->in; \
\
for (i = 0, j = 0; i < nfft; i++) { \
/* convert to mono */ \
for (k = 0, acc = 0; k < channels; k++) \
acc += samples[j++]; \
in[i] = (g##type) (acc / channels); \
if (abs (in[i]) > 1.0) \
g_assert_not_reached(); \
} \
\
if (!spectrum->fft_ctx) { \
spectrum->fft_ctx = gst_fft_f##width##_new (nfft, FALSE); \
spectrum->fft_free_func = (GstSpectrumFFTFreeFunc) gst_fft_f##width##_free; \
} \
ctx = spectrum->fft_ctx; \
\
gst_fft_f##width##_window (ctx, in, GST_FFT_WINDOW_HAMMING); \
\
if (!spectrum->freqdata) \
spectrum->freqdata = g_new (GstFFTF##width##Complex, spectrum->bands); \
\
freqdata = (GstFFTF##width##Complex *) spectrum->freqdata; \
\
gst_fft_f##width##_fft (ctx, in, freqdata); \
spectrum->num_fft++; \
\
/* Calculate magnitude in db */ \
for (i = 0; i < spectrum->bands; i++) { \
gdouble val = 0.0; \
val = freqdata[i].r * freqdata[i].r; \
val += freqdata[i].i * freqdata[i].i; \
val /= nfft*nfft; \
val = 10.0 * log10 (val); \
if (val < spectrum->threshold) \
val = spectrum->threshold; \
spect_magnitude[i] += val; \
} \
\
/* Calculate phase */ \
for (i = 0; i < spectrum->bands; i++) \
spect_phase[i] += atan2 (freqdata[i].i, freqdata[i].r); \
\
}
DEFINE_PROCESS_FUNC_FLOAT (32, float);
DEFINE_PROCESS_FUNC_FLOAT (64, double);
static GstFlowReturn
gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * in)
{
GstSpectrum *spectrum = GST_SPECTRUM (trans);
gint wanted;
gint i;
gfloat *spect_magnitude = spectrum->spect_magnitude;
gfloat *spect_phase = spectrum->spect_phase;
gint rate = GST_AUDIO_FILTER (spectrum)->format.rate;
gint channels = GST_AUDIO_FILTER (spectrum)->format.channels;
gint width = GST_AUDIO_FILTER (spectrum)->format.width / 8;
gint nfft = 2 * spectrum->bands - 2;
GstClockTime endtime =
gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (in));
GstClockTime blktime = GST_FRAMES_TO_CLOCK_TIME (nfft, rate);
GST_LOG_OBJECT (spectrum, "input size: %d bytes", GST_BUFFER_SIZE (in));
/* can we do this nicer? */
gst_adapter_push (spectrum->adapter, gst_buffer_copy (in));
/* required number of bytes */
wanted = channels * nfft * width;
while (gst_adapter_available (spectrum->adapter) >= wanted) {
const guint8 *samples;
samples = gst_adapter_peek (spectrum->adapter, wanted);
spectrum->process (spectrum, samples);
spectrum->num_frames += nfft;
endtime += blktime;
/* do we need to message ? */
if (spectrum->num_frames >=
GST_CLOCK_TIME_TO_FRAMES (spectrum->interval, rate)) {
if (spectrum->message) {
GstMessage *m;
/* Calculate average */
for (i = 0; i < spectrum->bands; i++) {
spect_magnitude[i] /= spectrum->num_fft;
spect_phase[i] /= spectrum->num_fft;
}
m = gst_spectrum_message_new (spectrum, endtime);
gst_element_post_message (GST_ELEMENT (spectrum), m);
}
memset (spect_magnitude, 0, spectrum->bands * sizeof (gfloat));
memset (spect_phase, 0, spectrum->bands * sizeof (gfloat));
spectrum->num_frames = 0;
spectrum->num_fft = 0;
}
gst_adapter_flush (spectrum->adapter, wanted);
}
return GST_FLOW_OK;
}
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)