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reworked level plugin. It now does RMS, peak, and decay peak signaling per interleaved channel.

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Original commit message from CVS:
reworked level plugin.  It now does RMS, peak, and decay peak signaling
per interleaved channel.
This commit is contained in:
Thomas Vander Stichele 2003-09-21 12:21:49 +00:00
parent 6ecea15a25
commit 1bb14f4e48
6 changed files with 320 additions and 112 deletions
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24
gst/level/Makefile.am
View file

@ -1,11 +1,33 @@
plugin_LTLIBRARIES = libgstlevel.la
libgstlevel_la_SOURCES = gstlevel.c
libgstlevel_la_SOURCES = gstlevel.c gstlevel-marshal.c
libgstlevel_la_CFLAGS = $(GST_CFLAGS)
libgstlevel_la_LIBADD =
libgstlevel_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = gstlevel.h filter.func
EXTRA_libgstlevel_la_SOURCES = gstlevel-marshal.list
BUILT_SOURCES = \
gstlevel-marshal.c \
gstlevel-marshal.h
gstlevel-marshal.h: gstlevel-marshal.list
glib-genmarshal --header --prefix=gstlevel_cclosure_marshal $(srcdir)/gstlevel-marshal.list > gstlevel-marshal.h.tmp
mv gstlevel-marshal.h.tmp gstlevel-marshal.h
gstlevel-marshal.c: gstlevel-marshal.list
echo "#include \"glib.h\"" > gstlevel-marshal.c.tmp
echo "#include \"glib-object.h\"" >> gstlevel-marshal.c.tmp
echo "#include \"gstlevel-marshal.h\"" >> gstlevel-marshal.c.tmp
glib-genmarshal --body --prefix=gstlevel_cclosure_marshal $(srcdir)/gstlevel-marshal.list >> gstlevel-marshal.c.tmp
mv gstlevel-marshal.c.tmp gstlevel-marshal.c
# Don't want the generated marshal files in the dist
dist-hook:
rm -f $(distdir)/gstlevel-marshal.c
rm -f $(distdir)/gstlevel-marshal.h
EXTRA_DIST = README

24
gst/level/README
View file

@ -1,11 +1,21 @@
level plugin by thomas <thomas@apestaart.org>
basic level indicator; prints out RMS values averaged over the buffer of
one iteration. Insert this into an audio/raw chain.
this plugin signals:
- channel
- RMS level
- peak level
- decaying peak level
over the given interval.
This is useful for a VU meter display and for plotting out the signal graph.
The VU meter can either display RMS, or display immediate peak level and
have the falloff decaying peak level displayed as a line.
The interval for signal emission, ttl of decay peak, and falloff of decay peak
can all be set.
The element only takes unsigned data in; it could be extended to signed as
well, if separate fast chain functions are made that displaces the incoming
data to its midpoint (ie, 0,65535 should be mapped to -32768, 32767)
You can plot the level envelope of the track using gnuplot, example :
tools/gstreamer-launch disksrc location=foo.wav ! parsewav ! level ! \
fakesink silent=true > foo.level
graph -T gif foo.level > foo.gif
xview dark.gif

57
gst/level/filter.func
View file

@ -1,45 +1,34 @@
/* process one (interleaved) channel of incoming samples
* calculate square sum of samples
* normalize and return normalized Cumulative Square
* caller must assure num is a multiple of channels
* this filter only accepts signed audio data, so mid level is always 0
*/
{
guint j;
double squaresum = 0.0;
double RMS = 0.0;
double RMS_dB = 0.0;
static int threshold_dB = -80;
static long int sample = 0;
double timepoint;
register int j;
double squaresum = 0.0; /* square sum of the integer samples */
register double square = 0.0; /* Square */
register double PSS = 0.0; /* Peak Square Sample */
*CS = 0.0; /* Cumulative Square for this block */
gdouble normalizer = (double) (1 << resolution);
/*
* process data here
* input sample data enters in *in_data as 8 or 16 bit data
* samples for left and right channel are interleaved
* returns the Mean Square of the samples as a double between 0 and 1
*/
/*
for(j = 0; j < num_samples; j++) {
out_data[j] = in_data[j];
squaresum += in_data[j] * in_data[j];
}
RMS = sqrt (squaresum / (float) num_samples);
printf ("RMS for this block : %f\n", RMS);
RMS_dB = 20 * log (RMS / 32767);
printf ("RMS in dB (for 16bit) : %f\n", RMS_dB);
*/
for(j = 0; j < num_samples; j++) {
out_data[j] = in_data[j];
squaresum += pow ((double) in_data[j] / 32767.0, 2);
}
RMS = sqrt (squaresum / (float) num_samples);
RMS_dB = 10 * log (RMS);
sample += num_samples;
timepoint = sample / (44100.0 * 2);
if (RMS_dB > (double) threshold_dB)
for (j = 0; j < num; j += channels)
{
/* printf ("Reached %d dB at %f sec (%f dB)\n",
threshold_dB, timepoint, RMS_dB);
*/
threshold_dB += 1;
square = (double) (in[j] * in[j]);
if (square > PSS) PSS = square;
squaresum += square;
}
/* printf ("RMS in dB (for 16bit) : %f\n", RMS_dB); */
printf ("%f s %f dB\n", timepoint, RMS_dB);
*peak = PSS / ((double) normalizer * (double) normalizer);
/* return normalized cumulative square */
*CS = squaresum / ((double) normalizer * (double) normalizer);
}

1
gst/level/gstlevel-marshal.list Normal file
View file

@ -0,0 +1 @@
VOID:INT,DOUBLE,DOUBLE,DOUBLE

298
gst/level/gstlevel.c
View file

@ -1,6 +1,10 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* gstlevel.c: signals RMS, peak and decaying peak levels
* Copyright (C) 2000,2001,2002,2003
* Thomas Vander Stichele <thomas at apestaart dot 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
@ -17,34 +21,35 @@
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include "gstlevel.h"
#include "math.h"
#include <gst/audio/audio.h>
/* elementfactory information */
static GstElementDetails level_details = {
"Level",
"Filter/Audio/Analysis",
"LGPL",
"RMS Level indicator for audio/raw",
"RMS/Peak/Decaying Peak Level signaller for audio/raw",
VERSION,
"Thomas <thomas@apestaart.org>",
"(C) 2001",
"(C) 2001, 2003, 2003",
};
/* Filter signals and args */
enum {
/* FILL ME */
SIGNAL_LEVEL,
LAST_SIGNAL
};
enum {
ARG_0
ARG_0,
ARG_SIGNAL_LEVEL,
ARG_SIGNAL_INTERVAL,
ARG_PEAK_TTL,
ARG_PEAK_FALLOFF
};
static GstPadTemplate*
@ -59,11 +64,12 @@ level_src_factory (void)
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/x-raw-int",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS
),
NULL
);
"audio/raw",
gst_props_new (
"channels", GST_PROPS_INT_RANGE (1, 2),
"signed", GST_PROPS_BOOLEAN (TRUE),
NULL)),
NULL);
}
return template;
}
@ -80,11 +86,12 @@ level_sink_factory (void)
GST_PAD_ALWAYS,
gst_caps_new (
"test_src",
"audio/x-raw-int",
GST_AUDIO_INT_PAD_TEMPLATE_PROPS
),
NULL
);
"audio/raw",
gst_props_new (
"channels", GST_PROPS_INT_RANGE (1, 2),
"signed", GST_PROPS_BOOLEAN (TRUE),
NULL)),
NULL);
}
return template;
}
@ -96,13 +103,9 @@ static void gst_level_set_property (GObject *object, guint prop_id, const GVa
static void gst_level_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_level_chain (GstPad *pad, GstBuffer *buf);
static void inline gst_level_fast_16bit_chain (gint16* data, gint16* out_data,
guint numsamples);
static void inline gst_level_fast_8bit_chain (gint8* data, gint8* out_data,
guint numsamples);
static GstElementClass *parent_class = NULL;
/*static guint gst_filter_signals[LAST_SIGNAL] = { 0 }; */
static guint gst_filter_signals[LAST_SIGNAL] = { 0 };
GType
gst_level_get_type (void)
@ -129,6 +132,8 @@ gst_level_connect (GstPad *pad, GstCaps *caps)
{
GstLevel *filter;
GstPad *otherpad;
GstPadLinkReturn res;
int i;
filter = GST_LEVEL (gst_pad_get_parent (pad));
g_return_val_if_fail (filter != NULL, GST_PAD_LINK_REFUSED);
@ -137,73 +142,172 @@ gst_level_connect (GstPad *pad, GstCaps *caps)
if (GST_CAPS_IS_FIXED (caps))
{
/*if ( !volume_parse_caps (filter, caps) || */
return gst_pad_try_set_caps (otherpad, gst_caps_ref (caps));
/* yep, got them */
res = gst_pad_try_set_caps (otherpad, caps);
/* if ok, set filter */
if (res == GST_PAD_LINK_OK)
{
filter->num_samples = 0;
/* FIXME: error handling */
if (! gst_caps_get_int (caps, "rate", &(filter->rate)))
g_warning ("WARNING: level: Could not get rate from caps\n");
if (!gst_caps_get_int (caps, "width", &(filter->width)))
g_warning ("WARNING: level: Could not get width from caps\n");
if (!gst_caps_get_int (caps, "channels", &(filter->channels)))
g_warning ("WARNING: level: Could not get number of channels from caps\n");
/* allocate channel variable arrays */
if (filter->CS) g_free (filter->CS);
if (filter->peak) g_free (filter->peak);
if (filter->last_peak) g_free (filter->last_peak);
if (filter->decay_peak) g_free (filter->decay_peak);
if (filter->decay_peak_age) g_free (filter->decay_peak_age);
if (filter->MS) g_free (filter->MS);
if (filter->RMS_dB) g_free (filter->RMS_dB);
filter->CS = g_new (double, filter->channels);
filter->peak = g_new (double, filter->channels);
filter->last_peak = g_new (double, filter->channels);
filter->decay_peak = g_new (double, filter->channels);
filter->decay_peak_age = g_new (double, filter->channels);
filter->MS = g_new (double, filter->channels);
filter->RMS_dB = g_new (double, filter->channels);
for (i = 0; i < filter->channels; ++i)
{
filter->CS[i] = filter->peak[i] = filter->last_peak[i] =
filter->decay_peak[i] = filter->decay_peak_age[i] =
filter->MS[i] = filter->RMS_dB[i] = 0.0;
}
}
return res;
}
return GST_PAD_LINK_DELAYED;
}
static void inline
gst_level_fast_16bit_chain (gint16* in, guint num, gint channels,
gint resolution, double *CS, double *peak)
#include "filter.func"
static void inline
gst_level_fast_8bit_chain (gint8* in, guint num, gint channels,
gint resolution, double *CS, double *peak)
#include "filter.func"
static void
gst_level_chain (GstPad *pad, GstBuffer *buf)
{
GstLevel *filter;
gint16 *in_data;
gint16 *out_data;
GstBuffer* outbuf;
gint width;
GstCaps *caps;
double CS = 0.0;
gint num_samples = 0;
gint i;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
g_print ("\nDEBUG: chain start\n");
filter = GST_LEVEL (GST_OBJECT_PARENT (pad));
g_return_if_fail (filter != NULL);
g_return_if_fail (GST_IS_LEVEL (filter));
caps = NULL;
caps = GST_PAD_CAPS (pad);
if (caps == NULL)
{
/* FIXME : Please change this to a better warning method ! */
g_error ("WARNING: level: Could not get pad caps - caps nego failed !\n");
}
gst_caps_get_int (caps, "width", &width);
in_data = (gint16 *) GST_BUFFER_DATA(buf);
outbuf = gst_buffer_new();
GST_BUFFER_DATA (outbuf) = (gchar *) g_new (gint16,
GST_BUFFER_SIZE (buf) / 2);
GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf);
out_data = (gint16 *) GST_BUFFER_DATA (outbuf);
for (i = 0; i < filter->channels; ++i)
filter->CS[i] = filter->peak[i] = filter->MS[i] = filter->RMS_dB[i] = 0.0;
g_print ("%s: ", gst_element_get_name (GST_ELEMENT (filter)));
switch (width) {
case 16:
gst_level_fast_16bit_chain (in_data, out_data,
GST_BUFFER_SIZE (buf) / 2);
break;
case 8:
gst_level_fast_8bit_chain ((gint8 *) in_data,
(gint8 *) out_data, GST_BUFFER_SIZE(buf));
break;
in_data = (gint16 *) GST_BUFFER_DATA(buf);
num_samples = GST_BUFFER_SIZE (buf) / (filter->width / 8);
if (num_samples % filter->channels != 0)
g_warning ("WARNING: level: programming error, data not properly interleaved");
for (i = 0; i < filter->channels; ++i)
{
switch (filter->width)
{
case 16:
gst_level_fast_16bit_chain (in_data + i, num_samples,
filter->channels, filter->width - 1,
&CS, &filter->peak[i]);
break;
case 8:
gst_level_fast_8bit_chain (((gint8 *) in_data) + i, num_samples,
filter->channels, filter->width - 1,
&CS, &filter->peak[i]);
break;
}
g_print ("DEBUG: CS %f, peak %f\n", CS, filter->peak[i]);
filter->CS[i] += CS;
}
gst_pad_push (filter->srcpad, buf);
filter->num_samples += num_samples;
for (i = 0; i < filter->channels; ++i)
{
filter->decay_peak_age[i] += num_samples;
g_print ("filter peak info [%d]: peak %f, age %f\n", i,
filter->last_peak[i], filter->decay_peak_age[i]);
/* update running peak */
if (filter->peak[i] > filter->last_peak[i])
filter->last_peak[i] = filter->peak[i];
/* update decay peak */
if (filter->peak[i] >= filter->decay_peak[i])
{
g_print ("new peak, %f\n", filter->peak[i]);
filter->decay_peak[i] = filter->peak[i];
filter->decay_peak_age[i] = 0;
}
else
{
/* make decay peak fall off if too old */
if (filter->decay_peak_age[i] > filter->rate * filter->decay_peak_ttl)
{
double falloff_dB;
double falloff;
double length; /* length of buffer in seconds */
length = (double) num_samples / (filter->channels * filter->rate);
falloff_dB = filter->decay_peak_falloff * length;
falloff = pow (10, falloff_dB / -20.0);
g_print ("falloff: length %f, dB falloff %f, falloff factor %e\n",
length, falloff_dB, falloff);
filter->decay_peak[i] *= falloff;
g_print ("peak is %f samples old, decayed with factor %e to %f\n",
filter->decay_peak_age[i], falloff, filter->decay_peak[i]);
}
}
}
/* do we need to emit ? */
if (filter->num_samples >= filter->interval * (gdouble) filter->rate)
{
if (filter->signal)
{
gdouble RMS, peak;
for (i = 0; i < filter->channels; ++i)
{
RMS = sqrt (filter->CS[i] / (filter->num_samples / filter->channels));
peak = filter->last_peak[i];
g_signal_emit (G_OBJECT (filter), gst_filter_signals[SIGNAL_LEVEL], 0,
i, 20 * log10 (RMS), 20 * log10 (filter->last_peak[i]),
20 * log10 (filter->decay_peak[i]));
/* we emitted, so reset cumulative and normal peak */
filter->CS[i] = 0.0;
filter->last_peak[i] = 0.0;
}
}
filter->num_samples = 0;
}
gst_buffer_unref (buf);
gst_pad_push (filter->srcpad,outbuf);
}
static void inline
gst_level_fast_16bit_chain (gint16* in_data, gint16* out_data,
guint num_samples)
#include "filter.func"
static void inline
gst_level_fast_8bit_chain (gint8* in_data, gint8* out_data,
guint num_samples)
#include "filter.func"
static void
gst_level_set_property (GObject *object, guint prop_id,
@ -216,6 +320,18 @@ gst_level_set_property (GObject *object, guint prop_id,
filter = GST_LEVEL (object);
switch (prop_id) {
case ARG_SIGNAL_LEVEL:
filter->signal = g_value_get_boolean (value);
break;
case ARG_SIGNAL_INTERVAL:
filter->interval = g_value_get_double (value);
break;
case ARG_PEAK_TTL:
filter->decay_peak_ttl = g_value_get_double (value);
break;
case ARG_PEAK_FALLOFF:
filter->decay_peak_falloff = g_value_get_double (value);
break;
default:
break;
}
@ -232,7 +348,19 @@ gst_level_get_property (GObject *object, guint prop_id,
filter = GST_LEVEL (object);
switch (prop_id) {
default:
case ARG_SIGNAL_LEVEL:
g_value_set_boolean (value, filter->signal);
break;
case ARG_SIGNAL_INTERVAL:
g_value_set_double (value, filter->interval);
break;
case ARG_PEAK_TTL:
g_value_set_double (value, filter->decay_peak_ttl);
break;
case ARG_PEAK_FALLOFF:
g_value_set_double (value, filter->decay_peak_falloff);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
@ -248,9 +376,32 @@ gst_level_class_init (GstLevelClass *klass)
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIGNAL_LEVEL,
g_param_spec_boolean ("signal", "Signal",
"Emit level signals for each interval",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SIGNAL_INTERVAL,
g_param_spec_double ("interval", "Interval",
"Interval between emissions (in seconds)",
0.01, 100.0, 0.1, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PEAK_TTL,
g_param_spec_double ("peak_ttl", "Peak TTL",
"Time To Live of decay peak before it falls back",
0, 100.0, 0.3, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PEAK_FALLOFF,
g_param_spec_double ("peak_falloff", "Peak Falloff",
"Decay rate of decay peak after TTL (in dB/sec)",
0.0, G_MAXDOUBLE, 10.0, G_PARAM_READWRITE));
gobject_class->set_property = gst_level_set_property;
gobject_class->get_property = gst_level_get_property;
gst_filter_signals[SIGNAL_LEVEL] =
g_signal_new ("level", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstLevelClass, level), NULL, NULL,
gstlevel_cclosure_marshal_VOID__INT_DOUBLE_DOUBLE_DOUBLE,
G_TYPE_NONE, 4,
G_TYPE_INT, G_TYPE_DOUBLE, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
}
static void
@ -265,6 +416,19 @@ gst_level_init (GstLevel *filter)
gst_pad_set_chain_function (filter->sinkpad, gst_level_chain);
filter->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->CS = NULL;
filter->peak = NULL;
filter->MS = NULL;
filter->RMS_dB = NULL;
filter->rate = 0;
filter->width = 0;
filter->channels = 0;
filter->interval = 0.1;
filter->decay_peak_ttl = 0.4;
filter->decay_peak_falloff = 10.0; /* dB falloff (/sec) */
}
static gboolean

28
gst/level/gstlevel.h
View file

@ -1,6 +1,10 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* gstlevel.c: signals RMS, peak and decaying peak levels
* Copyright (C) 2000,2001,2002,2003
* Thomas Vander Stichele <thomas at apestaart dot 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
@ -24,8 +28,8 @@
#include <config.h>
#include <gst/gst.h>
/* #include <gst/meta/audioraw.h> */
#include "gstlevel-marshal.h"
#ifdef __cplusplus
extern "C" {
@ -49,14 +53,32 @@ typedef struct _GstLevelClass GstLevelClass;
struct _GstLevel {
GstElement element;
GstPad *sinkpad,*srcpad;
GstPad *sinkpad, *srcpad;
gboolean signal; /* whether or not to emit signals */
gdouble interval; /* how many seconds between emits */
/*MetaAudioRaw meta; */
gint rate; /* caps variables */
gint width;
gint channels;
gdouble decay_peak_ttl; /* time to live for peak in seconds */
gdouble decay_peak_falloff; /* falloff in dB/sec */
gdouble num_samples; /* cumulative sample count */
/* per-channel arrays for intermediate values */
gdouble *CS; /* normalized Cumulative Square */
gdouble *peak; /* normalized Peak value over buffer */
gdouble *last_peak; /* last normalized Peak value over interval */
gdouble *decay_peak; /* running decaying normalized Peak */
gdouble *MS; /* normalized Mean Square of buffer */
gdouble *RMS_dB; /* RMS in dB to emit */
gdouble *decay_peak_age; /* age of last peak */
};
struct _GstLevelClass {
GstElementClass parent_class;
void (*level) (GstElement *element, gint channel,
gdouble RMS_dB, gdouble peak_dB, gdouble decay_peak_dB);
};
GType gst_level_get_type(void);