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gst/spectrum/: port to use message to get results, cleanly exit when closing the window

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Original commit message from CVS:
* gst/spectrum/demo-audiotest.c: (on_window_destroy),
(draw_spectrum), (message_handler), (main):
* gst/spectrum/demo-osssrc.c: (on_window_destroy), (draw_spectrum),
(message_handler), (main):
port to use message to get results, cleanly exit when closing the window
* gst/spectrum/gstspectrum.c: (gst_spectrum_class_init),
(gst_spectrum_init), (gst_spectrum_dispose),
(gst_spectrum_set_property), (gst_spectrum_get_property),
(gst_spectrum_set_caps), (gst_spectrum_start),
(gst_spectrum_message_new), (gst_spectrum_transform_ip):
* gst/spectrum/gstspectrum.h:
port to derive from basetransform and send results via messages
(like level element)
This commit is contained in:
Stefan Kost 2006-06-16 09:49:07 +00:00
parent 2d24aef083
commit 2787798482
5 changed files with 401 additions and 106 deletions
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2
common

@ -1 +1 @@
Subproject commit dd85f550441bd5722b98f4dd304e40826383240f
Subproject commit bbfa0146961f4ca61ddbca7b42360b5741a6354b

287
gst/spectrum/gstspectrum.c
View file

@ -22,21 +22,41 @@
*
* <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.
* 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 #guchar
* <classname>&quot;spectrum&quot;</classname>:
* the level for each frequency band. A value of 0 maps to the
* db value given by the
* <link linkend="GstSpectrum--threshold">threshold property.</link>.
* </para>
* </listitem>
*
* It cannot be used with the gst-launch command in a sensible way. Instead the
* included demo shows how to use it.
* 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 2006-05-21 (0.10.3)
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/audio/audio.h>
#include "gstspectrum.h"
GST_DEBUG_CATEGORY_STATIC (gst_spectrum_debug);
@ -61,37 +81,57 @@ GST_STATIC_PAD_TEMPLATE ("sink",
"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 ("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 */
/* Spectrum properties */
enum
{
/* FILL ME */
LAST_SIGNAL
PROP_0,
PROP_SIGNAL_SPECTRUM,
PROP_SIGNAL_INTERVAL,
PROP_BANDS,
PROP_THRESHOLD
};
enum
{
ARG_0,
ARG_WIDTH,
ARG_THRESHOLD
};
GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstElement, GST_TYPE_ELEMENT);
GST_BOILERPLATE (GstSpectrum, gst_spectrum, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM);
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_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);
*/
static gboolean gst_spectrum_set_caps (GstBaseTransform * trans, GstCaps * in,
GstCaps * out);
static gboolean gst_spectrum_start (GstBaseTransform * trans);
static GstFlowReturn gst_spectrum_transform_ip (GstBaseTransform * trans,
GstBuffer * in);
#define fixed short
extern int gst_spectrum_fix_fft (fixed fr[], fixed fi[], int m, int inverse);
@ -99,8 +139,6 @@ 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)
{
@ -117,21 +155,36 @@ static void
gst_spectrum_class_init (GstSpectrumClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element = GST_ELEMENT_CLASS (klass);
GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
gobject_class->set_property = gst_spectrum_set_property;
gobject_class->get_property = gst_spectrum_get_property;
gobject_class->dispose = gst_spectrum_dispose;
element->change_state = gst_spectrum_change_state;
/*element->change_state = gst_spectrum_change_state; */
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_spectrum_set_caps);
trans_class->start = GST_DEBUG_FUNCPTR (gst_spectrum_start);
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_spectrum_transform_ip);
trans_class->passthrough_on_same_caps = TRUE;
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, PROP_SIGNAL_SPECTRUM,
g_param_spec_boolean ("message", "mesage",
"Post a level message for each passed interval",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_THRESHOLD,
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, GST_SECOND / 10, 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, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_THRESHOLD,
g_param_spec_int ("threshold", "Threshold",
"db threshold for result, maps to 0", G_MININT, 0, -60,
G_PARAM_WRITABLE));
G_PARAM_READWRITE));
GST_DEBUG_CATEGORY_INIT (gst_spectrum_debug, "spectrum", 0,
"audio spectrum analyser element");
@ -140,20 +193,22 @@ gst_spectrum_class_init (GstSpectrumClass * klass)
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->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->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->bands = 128;
spectrum->base = 9;
spectrum->len = 1024; /* 2 ^ (base+1) */
@ -162,6 +217,7 @@ gst_spectrum_init (GstSpectrum * spectrum, GstSpectrumClass * g_class)
memset (spectrum->im, 0, spectrum->len * sizeof (gint16));
spectrum->re = g_malloc (spectrum->len * sizeof (gint16));
memset (spectrum->re, 0, spectrum->len * sizeof (gint16));
spectrum->spect = g_malloc (spectrum->bands * sizeof (guchar));
}
static void
@ -177,6 +233,7 @@ gst_spectrum_dispose (GObject * object)
g_free (spectrum->re);
g_free (spectrum->im);
g_free (spectrum->loud);
g_free (spectrum->spect);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
@ -185,14 +242,24 @@ static void
gst_spectrum_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSpectrum *spectrum = GST_SPECTRUM (object);
GstSpectrum *filter = GST_SPECTRUM (object);
switch (prop_id) {
case ARG_WIDTH:
spectrum->width = g_value_get_uint (value);
case PROP_SIGNAL_SPECTRUM:
filter->message = g_value_get_boolean (value);
break;
case ARG_THRESHOLD:
spectrum->threshold = g_value_get_int (value);
case PROP_SIGNAL_INTERVAL:
filter->interval = gst_guint64_to_gdouble (g_value_get_uint64 (value));
break;
case PROP_BANDS:
filter->bands = g_value_get_uint (value);
g_free (filter->spect);
filter->spect = g_malloc (filter->bands * sizeof (guchar));
GST_DEBUG_OBJECT (filter, "reallocation, spect = %p, bands =%d ",
filter->spect, 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);
@ -200,6 +267,32 @@ gst_spectrum_set_property (GObject * object, guint prop_id,
}
}
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_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_set_sink_caps (GstPad * pad, GstCaps * caps)
{
@ -232,29 +325,89 @@ gst_spectrum_get_sink_caps (GstPad * pad)
gst_object_unref (spectrum);
return res;
}
*/
static gboolean
gst_spectrum_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
GstSpectrum *filter = GST_SPECTRUM (trans);
GstStructure *structure;
structure = gst_caps_get_structure (in, 0);
gst_structure_get_int (structure, "rate", &filter->rate);
gst_structure_get_int (structure, "width", &filter->width);
gst_structure_get_int (structure, "channels", &filter->channels);
return TRUE;
}
static gboolean
gst_spectrum_start (GstBaseTransform * trans)
{
GstSpectrum *filter = GST_SPECTRUM (trans);
gst_adapter_clear (filter->adapter);
filter->num_frames = 0;
return TRUE;
}
static GstMessage *
gst_spectrum_message_new (GstSpectrum * spectrum, GstClockTime endtime)
{
GstStructure *s;
GValue v = { 0, };
GValue *l;
guint i;
guchar *spect = spectrum->spect;
GST_DEBUG_OBJECT (spectrum, "preparing message, spect = %p, bands =%d ",
spect, spectrum->bands);
s = gst_structure_new ("spectrum", "endtime", GST_TYPE_CLOCK_TIME,
endtime, NULL);
g_value_init (&v, GST_TYPE_LIST);
/* will copy-by-value */
gst_structure_set_value (s, "spectrum", &v);
g_value_unset (&v);
g_value_init (&v, G_TYPE_UCHAR);
l = (GValue *) gst_structure_get_value (s, "spectrum");
for (i = 0; i < spectrum->bands; i++) {
g_value_set_uchar (&v, spect[i]);
gst_value_list_append_value (l, &v); /* copies by value */
}
g_value_unset (&v);
return gst_message_new_element (GST_OBJECT (spectrum), s);
}
static GstFlowReturn
gst_spectrum_chain (GstPad * pad, GstBuffer * buffer)
gst_spectrum_transform_ip (GstBaseTransform * trans, GstBuffer * in)
{
GstSpectrum *spectrum = GST_SPECTRUM (gst_pad_get_parent (pad));
GstSpectrum *spectrum = GST_SPECTRUM (trans);
gint16 *samples;
gint wanted;
gint i, j, k;
gint32 acc;
gfloat pos, step;
guchar *spect;
GstBuffer *outbuf;
GstFlowReturn ret = GST_FLOW_OK;
guchar *spect = spectrum->spect;
GstClockTime endtime = GST_BUFFER_TIMESTAMP (in);
GstClockTime blktime =
GST_FRAMES_TO_CLOCK_TIME (spectrum->len, spectrum->rate);
gst_adapter_push (spectrum->adapter, buffer);
GST_DEBUG ("transform : %ld bytes", GST_BUFFER_SIZE (in));
gst_adapter_push (spectrum->adapter, gst_buffer_ref (in));
/* 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);
step = (gfloat) spectrum->len / (spectrum->bands * 4.0);
while (gst_adapter_available (spectrum->adapter) > wanted &&
(ret == GST_FLOW_OK)) {
while (gst_adapter_available (spectrum->adapter) > wanted) {
GST_DEBUG (" adapter loop");
samples = (gint16 *) gst_adapter_take (spectrum->adapter, wanted);
for (i = 0, j = 0; i < spectrum->len; i++) {
@ -263,19 +416,17 @@ gst_spectrum_chain (GstPad * pad, GstBuffer * buffer)
spectrum->re[i] = (gint16) (acc / spectrum->channels);
}
GST_DEBUG (" fft");
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);
GST_DEBUG (" resampling");
/* 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 */
/* resample to requested number of bands */
for (i = 0, pos = 0.0; i < spectrum->bands; i++, pos += step) {
if (spectrum->loud[(gint) pos] > spectrum->threshold) {
spect[i] = spectrum->loud[(gint) pos] - spectrum->threshold;
/*
@ -287,13 +438,27 @@ gst_spectrum_chain (GstPad * pad, GstBuffer * buffer)
spect[i] = 0;
}
ret = gst_pad_push (spectrum->srcpad, outbuf);
GST_DEBUG (" send message?");
//ret = gst_pad_push (spectrum->srcpad, outbuf);
spectrum->num_frames += spectrum->len;
endtime += blktime;
/* do we need to message ? */
if (spectrum->num_frames >=
GST_CLOCK_TIME_TO_FRAMES (spectrum->interval, spectrum->rate)) {
if (spectrum->message) {
GstMessage *m = gst_spectrum_message_new (spectrum, endtime);
GST_DEBUG (" sending message");
gst_element_post_message (GST_ELEMENT (spectrum), m);
}
spectrum->num_frames = 0;
}
}
gst_object_unref (spectrum);
return ret;
return GST_FLOW_OK;
}
/*
static GstStateChangeReturn
gst_spectrum_change_state (GstElement * element, GstStateChange transition)
{
@ -327,7 +492,7 @@ gst_spectrum_change_state (GstElement * element, GstStateChange transition)
return ret;
}
*/
static gboolean
plugin_init (GstPlugin * plugin)

21
gst/spectrum/gstspectrum.h
View file

@ -24,6 +24,7 @@
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <gst/base/gstbasetransform.h>
#ifdef __cplusplus
extern "C" {
@ -40,25 +41,35 @@ typedef struct _GstSpectrum GstSpectrum;
typedef struct _GstSpectrumClass GstSpectrumClass;
struct _GstSpectrum {
GstElement element;
GstBaseTransform element;
GstPad *sinkpad,*srcpad;
GstAdapter *adapter;
/* properties */
guint width;
gint threshold;
gboolean message; /* whether or not to post messages */
gdouble interval; /* how many seconds between emits */
guint bands; /* number of spectrum bands */
gint threshold; /* energy level treshold */
gint num_frames; /* frame count (1 sample per channel)
* since last emit */
gint rate; /* caps variables */
gint width;
gint channels;
/* <private> */
gint base, len;
gint16 *re, *im, *loud;
guchar *spect;
};
struct _GstSpectrumClass {
GstElementClass parent_class;
GstBaseTransformClass parent_class;
};
GType gst_spectrum_get_type(void);
GType gst_spectrum_get_type (void);
#ifdef __cplusplus

110
tests/examples/spectrum/demo-audiotest.c
View file

@ -1,14 +1,44 @@
/* GStreamer
* Copyright (C) 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gtk/gtk.h>
#define DEFAULT_AUDIOSINK "alsasink"
#define SPECT_BANDS 256
static GtkWidget *drawingarea = NULL;
static gint ct = 0;
static void
on_window_destroy (GtkObject * object, gpointer user_data)
{
drawingarea = NULL;
gtk_main_quit ();
}
/* control audiotestsrc frequency */
static void
on_frequency_changed (GtkRange * range, gpointer user_data)
{
@ -18,26 +48,51 @@ on_frequency_changed (GtkRange * range, gpointer user_data)
g_object_set (machine, "freq", value, NULL);
}
/* draw frequency spectrum as a bunch of bars */
static void
spectrum_chain (GstElement * sink, GstBuffer * buf, GstPad * pad,
gpointer unused)
draw_spectrum (guchar * data)
{
ct = (ct + 1) & 0x15;
if (!ct) {
gint i;
guchar *data = buf->data;
gint width = GST_BUFFER_SIZE (buf);
GdkRectangle rect = { 0, 0, width, 50 };
gint i;
GdkRectangle rect = { 0, 0, SPECT_BANDS, 50 };
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, width, 50);
for (i = 0; i < width; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
if (!drawingarea)
return;
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, SPECT_BANDS, 50);
for (i = 0; i < SPECT_BANDS; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
}
/* receive spectral data from element message */
gboolean
message_handler (GstBus * bus, GstMessage * message, gpointer data)
{
if (message->type == GST_MESSAGE_ELEMENT) {
const GstStructure *s = gst_message_get_structure (message);
const gchar *name = gst_structure_get_name (s);
if (strcmp (name, "spectrum") == 0) {
guchar spect[SPECT_BANDS];
const GValue *list;
const GValue *value;
guint i;
list = gst_structure_get_value (s, "spectrum");
for (i = 0; i < SPECT_BANDS; ++i) {
value = gst_value_list_get_value (list, i);
spect[i] = g_value_get_uchar (value);
}
draw_spectrum (spect);
}
}
/* we handled the message we want, and ignored the ones we didn't want.
* so the core can unref the message for us */
return TRUE;
}
int
@ -45,7 +100,7 @@ main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GstBus *bus;
GtkWidget *appwindow, *vbox, *widget;
gst_init (&argc, &argv);
@ -54,16 +109,15 @@ main (int argc, char *argv[])
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make ("audiotestsrc", "src");
g_object_set (G_OBJECT (src), "blocksize", (gulong) 1024 * 2, NULL);
/*
g_object_set (G_OBJECT (src), "wave", 0, NULL);
*/
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "width", SPECT_BANDS, "threshold", -80,
NULL);
g_object_set (G_OBJECT (spectrum), "bands", SPECT_BANDS, "threshold", -80,
"message", TRUE, NULL);
sink = gst_element_factory_make ("fakesink", "sink");
g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE, NULL);
g_signal_connect (sink, "handoff", G_CALLBACK (spectrum_chain), NULL);
sink = gst_element_factory_make (DEFAULT_AUDIOSINK, "sink");
gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
if (!gst_element_link_many (src, spectrum, sink, NULL)) {
@ -71,7 +125,13 @@ main (int argc, char *argv[])
exit (1);
}
bus = gst_element_get_bus (bin);
gst_bus_add_watch (bus, message_handler, NULL);
gst_object_unref (bus);
appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (G_OBJECT (appwindow), "destroy",
G_CALLBACK (on_window_destroy), NULL);
vbox = gtk_vbox_new (FALSE, 6);
widget = gtk_hscale_new_with_range (50.0, 20000.0, 10);

87
tests/examples/spectrum/demo-osssrc.c
View file

@ -1,6 +1,27 @@
/* GStreamer
* Copyright (C) 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/gst.h>
#include <gtk/gtk.h>
@ -10,30 +31,65 @@
static GtkWidget *drawingarea = NULL;
static void
spectrum_chain (GstElement * sink, GstBuffer * buf, GstPad * pad,
gpointer unused)
on_window_destroy (GtkObject * object, gpointer user_data)
{
drawingarea = NULL;
gtk_main_quit ();
}
/* draw frequency spectrum as a bunch of bars */
static void
draw_spectrum (guchar * data)
{
gint i;
guchar *data = buf->data;
gint width = GST_BUFFER_SIZE (buf);
GdkRectangle rect = { 0, 0, width, 50 };
GdkRectangle rect = { 0, 0, SPECT_BANDS, 50 };
if (!drawingarea)
return;
gdk_window_begin_paint_rect (drawingarea->window, &rect);
gdk_draw_rectangle (drawingarea->window, drawingarea->style->black_gc,
TRUE, 0, 0, width, 50);
for (i = 0; i < width; i++) {
TRUE, 0, 0, SPECT_BANDS, 50);
for (i = 0; i < SPECT_BANDS; i++) {
gdk_draw_rectangle (drawingarea->window, drawingarea->style->white_gc,
TRUE, i, 64 - data[i], 1, data[i]);
}
gdk_window_end_paint (drawingarea->window);
}
/* receive spectral data from element message */
gboolean
message_handler (GstBus * bus, GstMessage * message, gpointer data)
{
if (message->type == GST_MESSAGE_ELEMENT) {
const GstStructure *s = gst_message_get_structure (message);
const gchar *name = gst_structure_get_name (s);
if (strcmp (name, "spectrum") == 0) {
guchar spect[SPECT_BANDS];
const GValue *list;
const GValue *value;
guint i;
list = gst_structure_get_value (s, "spectrum");
for (i = 0; i < SPECT_BANDS; ++i) {
value = gst_value_list_get_value (list, i);
spect[i] = g_value_get_uchar (value);
}
draw_spectrum (spect);
}
}
/* we handled the message we want, and ignored the ones we didn't want.
* so the core can unref the message for us */
return TRUE;
}
int
main (int argc, char *argv[])
{
GstElement *bin;
GstElement *src, *spectrum, *sink;
GstBus *bus;
GtkWidget *appwindow;
gst_init (&argc, &argv);
@ -42,16 +98,12 @@ main (int argc, char *argv[])
bin = gst_pipeline_new ("bin");
src = gst_element_factory_make (DEFAULT_AUDIOSRC, "src");
g_object_set (G_OBJECT (src), "blocksize", (gulong) 1024 * 2, NULL);
spectrum = gst_element_factory_make ("spectrum", "spectrum");
g_object_set (G_OBJECT (spectrum), "width", SPECT_BANDS, "threshold", -80,
NULL);
g_object_set (G_OBJECT (spectrum), "bands", SPECT_BANDS, "threshold", -80,
"message", TRUE, NULL);
sink = gst_element_factory_make ("fakesink", "sink");
g_object_set (G_OBJECT (sink), "signal-handoffs", TRUE, NULL);
g_signal_connect (sink, "handoff", G_CALLBACK (spectrum_chain), NULL);
gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
if (!gst_element_link_many (src, spectrum, sink, NULL)) {
@ -59,7 +111,14 @@ main (int argc, char *argv[])
exit (1);
}
bus = gst_element_get_bus (bin);
gst_bus_add_watch (bus, message_handler, NULL);
gst_object_unref (bus);
appwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (G_OBJECT (appwindow), "destroy",
G_CALLBACK (on_window_destroy), NULL);
drawingarea = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (drawingarea), SPECT_BANDS, 64);
gtk_container_add (GTK_CONTAINER (appwindow), drawingarea);