Commit 185612aa authored by Andy Wingo's avatar Andy Wingo
Browse files

Initial revision

Original commit message from CVS:
Initial revision
parent 87dab192
filterdir = $(libdir)/gst
filter_LTLIBRARIES = libgstcutter.la
libgstcutter_la_SOURCES = gstcutter.c
noinst_HEADERS = gstcutter.h filter.func
EXTRA_DIST = README
cutter plugin by thomas <thomas@apestaart.org>
SYNOPSIS
This plugin emits signals when RMS level of audio signal crosses a
threshold for a given amount of time.
As soon as the buffer's RMS is greater than the threshold value, the plugin fires a CUT_START signal.
When the buffer's RMS level drops below the threshold value for a consecutive run length longer than the given runlength, it sends a CUT_STOP signal.
When a pre-recording buffer is used, the plugin will delay throughput of data when it's in "silent" mode for a maximum length equal to the pre-recording buffer length. As soon as the input level crosses the threshold level, this pre-recorded buffer is flushed to the src pad (so you can actually record the audio just before the threshold crossing) after sending the signal.
ARGUMENTS
GstCutter::threshold
level (between 0 and 1) of threshold
GstCutter::threshold_dB
level of threshold in dB (between -inf and 0)
GstCutter::runlength
minimum length (in seconds) before plugin sends cut_stop signal
GstCutter::prelength
length of pre-recording buffer
SIGNALS
CUT_START
gets sent when the level of the signal goes above threshold level
CUT_STOP
gets sent when the level of the signal has been below the
threshold level for a number of consecutive iterations of which
the cumulative length is more than the runlength
LIMITATIONS
* RMS value is calculated over the whole data buffer, so
the time resolution is limited to the buffer length
* RMS value is calculated over all of the channels combined
{
guint j;
register double squaresum = 0.0;
/*
* process data here
* input sample data enters in *in_data as 8 or 16 bit data
* samples for left and right channel are interleaved
*/
for (j = 0; j < num_samples; j++)
squaresum += data[j] * data[j];
return (squaresum / (float) num_samples);
}
/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <gst/gst.h>
#include <libs/audio/gstaudio.h>
#include "cutter.h"
#include "math.h"
static GstElementDetails cutter_details = {
"Cutter",
"Filter/Effect",
"Audio Cutter to split audio into non-silent bits",
VERSION,
"Thomas <thomas@apestaart.org>",
"(C) 2001",
};
/* Filter signals and args */
enum {
/* FILL ME */
CUT_START,
CUT_STOP,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_THRESHOLD,
ARG_THRESHOLD_DB,
ARG_RUN_LENGTH,
ARG_PRE_LENGTH
};
GST_PADTEMPLATE_FACTORY (cutter_src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"test_src",
"audio/raw",
"channels", GST_PROPS_INT_RANGE (1, 2)
)
);
GST_PADTEMPLATE_FACTORY (cutter_sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"test_src",
"audio/raw",
"channels", GST_PROPS_INT_RANGE (1, 2)
)
);
static void gst_cutter_class_init (GstCutterClass *klass);
static void gst_cutter_init (GstCutter *filter);
static void gst_cutter_set_property (GObject *object, guint prop_id,
const GValue *value, GParamSpec *pspec);
static void gst_cutter_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec);
static void gst_cutter_chain (GstPad *pad, GstBuffer *buf);
static double inline gst_cutter_16bit_ms (gint16* data, guint numsamples);
static double inline gst_cutter_8bit_ms (gint8* data, guint numsamples);
void gst_cutter_get_caps (GstPad *pad, GstCutter* filter);
static GstElementClass *parent_class = NULL;
static guint gst_cutter_signals[LAST_SIGNAL] = { 0 };
static GstPadNegotiateReturn
cutter_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstCutter* filter = GST_CUTTER (gst_pad_get_parent (pad));
if (*caps==NULL)
return GST_PAD_NEGOTIATE_FAIL;
return gst_pad_negotiate_proxy(pad,filter->sinkpad,caps);
}
static GstPadNegotiateReturn
cutter_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstCutter* filter = GST_CUTTER (gst_pad_get_parent (pad));
if (*caps==NULL)
return GST_PAD_NEGOTIATE_FAIL;
return gst_pad_negotiate_proxy(pad,filter->srcpad,caps);
}
GType
gst_cutter_get_type(void) {
static GType cutter_type = 0;
if (!cutter_type) {
static const GTypeInfo cutter_info = {
sizeof(GstCutterClass), NULL, NULL, (GClassInitFunc)gst_cutter_class_init,
NULL,
NULL,
sizeof(GstCutter),
0,
(GInstanceInitFunc)gst_cutter_init,
};
cutter_type = g_type_register_static(GST_TYPE_ELEMENT, "GstCutter", &cutter_info, 0);
}
return cutter_type;
}
static void
gst_cutter_class_init (GstCutterClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*) klass;
gstelement_class = (GstElementClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_THRESHOLD,
g_param_spec_double ("threshold", "threshold", "threshold",
G_MINDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); // CHECKME
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_THRESHOLD_DB,
g_param_spec_double ("threshold_dB", "threshold_dB", "threshold_dB",
G_MINDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); // CHECKME
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_RUN_LENGTH,
g_param_spec_double ("runlength", "runlength", "runlength",
G_MINDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); // CHECKME
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PRE_LENGTH,
g_param_spec_double ("prelength", "prelength", "prelength",
G_MINDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); // CHECKME
gst_cutter_signals[CUT_START] =
g_signal_new ("cut_start", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstCutterClass, cut_start), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_cutter_signals[CUT_STOP] =
g_signal_new ("cut_stop", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GstCutterClass, cut_stop), NULL, NULL,
g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
gobject_class->set_property = gst_cutter_set_property;
gobject_class->get_property = gst_cutter_get_property;
}
static void
gst_cutter_init (GstCutter *filter)
{
filter->sinkpad = gst_pad_new_from_template (cutter_sink_factory (),"sink");
filter->srcpad = gst_pad_new_from_template (cutter_src_factory (),"src");
filter->threshold_level = 0.1;
filter->threshold_length = 0.5;
filter->silent_run_length = 0.0;
filter->silent = TRUE;
filter->pre_length = 0.2;
filter->pre_run_length = 0.0;
filter->pre_buffer = NULL;
gst_pad_set_negotiate_function (filter->sinkpad,cutter_negotiate_sink);
gst_pad_set_negotiate_function (filter->srcpad,cutter_negotiate_src);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
gst_pad_set_chain_function (filter->sinkpad, gst_cutter_chain);
filter->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
}
static void
gst_cutter_chain (GstPad *pad, GstBuffer *buf)
{
GstCutter *filter;
gint16 *in_data;
double RMS = 0.0; /* RMS of signal in buffer */
double ms = 0.0; /* mean square value of buffer */
static gboolean silent_prev = FALSE; /* previous value of silent */
GstBuffer* prebuf; /* pointer to a prebuffer element */
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
filter = GST_CUTTER (GST_OBJECT_PARENT (pad));
g_return_if_fail (filter != NULL);
g_return_if_fail (GST_IS_CUTTER (filter));
g_return_if_fail (gst_audio_is_buffer_framed (pad, buf) == TRUE);
if (!filter->have_caps) gst_cutter_get_caps (pad, filter);
in_data = (gint16 *) GST_BUFFER_DATA (buf);
g_print ("DEBUG: cutter: length of prerec buffer: %.3f sec\n",
filter->pre_run_length);
/* calculate mean square value on buffer */
switch (filter->width)
{
case 16:
ms = gst_cutter_16bit_ms (in_data, GST_BUFFER_SIZE (buf) / 2);
break;
case 8:
ms = gst_cutter_8bit_ms ((gint8 *) in_data, GST_BUFFER_SIZE (buf));
break;
default:
/* this shouldn't happen */
g_print ("WARNING: no mean square function for width %d\n",
filter->width);
break;
}
silent_prev = filter->silent;
RMS = sqrt (ms) / (double) filter->max_sample;
/* if RMS below threshold, add buffer length to silent run length count
* if not, reset
*/
//g_print ("DEBUG: cutter: ms %f, RMS %f\n", ms, RMS);
if (RMS < filter->threshold_level)
filter->silent_run_length += gst_audio_length (filter->srcpad, buf);
else
{
filter->silent_run_length = 0.0;
filter->silent = FALSE;
}
if (filter->silent_run_length > filter->threshold_length)
/* it has been silent long enough, flag it */
filter->silent = TRUE;
/* has the silent status changed ? if so, send right signal
* and, if from silent -> not silent, flush pre_record buffer
*/
if (filter->silent != silent_prev)
{
if (filter->silent)
{
// g_print ("DEBUG: cutter: cut to here, turning off out\n");
gtk_signal_emit (G_OBJECT (filter), gst_cutter_signals[CUT_STOP]);
}
else
{
// g_print ("DEBUG: cutter: start from here, turning on out\n");
/* first of all, flush current buffer */
gtk_signal_emit (G_OBJECT (filter), gst_cutter_signals[CUT_START]);
g_print ("DEBUG: cutter: flushing buffer ");
while (filter->pre_buffer)
{
g_print (".");
prebuf = (g_list_first (filter->pre_buffer))->data;
filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
gst_pad_push (filter->srcpad, prebuf);
filter->pre_run_length = 0.0;
}
g_print ("\n");
}
}
/* now check if we have to add the new buffer to the cache or to the pad */
if (filter->silent)
{
filter->pre_buffer = g_list_append (filter->pre_buffer, buf);
filter->pre_run_length += gst_audio_length (filter->srcpad, buf);
while (filter->pre_run_length > filter->pre_length)
{
prebuf = (g_list_first (filter->pre_buffer))->data;
filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
gst_pad_push (filter->srcpad, prebuf);
filter->pre_run_length -= gst_audio_length (filter->srcpad, prebuf);
}
}
else
gst_pad_push (filter->srcpad, buf);
}
static double inline
gst_cutter_16bit_ms (gint16* data, guint num_samples)
#include "filter.func"
static double inline
gst_cutter_8bit_ms (gint8* data, guint num_samples)
#include "filter.func"
static void
gst_cutter_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstCutter *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_CUTTER (object));
filter = GST_CUTTER (object);
switch (prop_id)
{
case ARG_THRESHOLD:
/* set the level */
filter->threshold_level = g_value_get_double (value);
g_print ("DEBUG: cutter: set threshold level to %f\n",
filter->threshold_level);
break;
case ARG_THRESHOLD_DB:
/* set the level given in dB
* value in dB = 20 * log (value)
* values in dB < 0 result in values between 0 and 1
*/
filter->threshold_level = pow (10, g_value_get_double (value) / 20);
g_print ("DEBUG: cutter: set threshold level to %f\n",
filter->threshold_level);
break;
case ARG_RUN_LENGTH:
/* set the minimum length of the silent run required */
filter->threshold_length = g_value_get_double (value);
break;
case ARG_PRE_LENGTH:
/* set the length of the pre-record block */
filter->pre_length = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_cutter_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstCutter *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_CUTTER(object));
filter = GST_CUTTER (object);
switch (prop_id)
{
case ARG_RUN_LENGTH:
g_value_set_double (value, filter->threshold_length);
break;
case ARG_THRESHOLD:
g_value_set_double (value, filter->threshold_level);
break;
case ARG_THRESHOLD_DB:
g_value_set_double (value, 20 * log (filter->threshold_level));
break;
case ARG_PRE_LENGTH:
g_value_set_double (value, filter->pre_length);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_elementfactory_new("cutter",GST_TYPE_CUTTER,
&cutter_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (cutter_src_factory));
gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (cutter_sink_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
/* load audio support library */
if (!gst_library_load ("gstaudio"))
{
gst_info ("cutter: could not load support library: 'gstaudio'\n");
return FALSE;
}
return TRUE;
}
GstPluginDesc plugin_desc =
{
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"cutter",
plugin_init
};
void
gst_cutter_get_caps (GstPad *pad, GstCutter* filter)
{
GstCaps *caps = NULL;
caps = GST_PAD_CAPS (pad);
// FIXME : Please change this to a better warning method !
if (caps == NULL)
printf ("WARNING: cutter: get_caps: Could not get caps of pad !\n");
filter->width = gst_caps_get_int (caps, "width");
filter->max_sample = gst_audio_highest_sample_value (pad);
filter->have_caps = TRUE;
}
/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#ifndef __GST_CUTTER_H__
#define __GST_CUTTER_H__
#include <config.h>
#include <gst/gst.h>
// #include <gst/meta/audioraw.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define GST_TYPE_CUTTER \
(gst_cutter_get_type())
#define GST_CUTTER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CUTTER,GstCutter))
#define GST_CUTTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstCutter))
#define GST_IS_CUTTER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CUTTER))
#define GST_IS_CUTTER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CUTTER))
typedef struct _GstCutter GstCutter;
typedef struct _GstCutterClass GstCutterClass;
struct _GstCutter
{
GstElement element;
GstPad *sinkpad, *srcpad;
double threshold_level; /* level below which to cut */
double threshold_length; /* how long signal has to remain
* below this level before cutting
*/
double silent_run_length; /* how long has it been below threshold ? */
gboolean silent;
double pre_length; /* how long can the pre-record buffer be ? */
double pre_run_length; /* how long is it currently ? */
GList *pre_buffer;
gboolean have_caps; /* did we get the needed caps yet ? */
gint width; /* bit width of data */
long max_sample; /* maximum sample value */
};
struct _GstCutterClass {
GstElementClass parent_class;
void (*cut_start) (GstCutter* filter);
void (*cut_stop) (GstCutter* filter);
};
GType gst_cutter_get_type(void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_STEREO_H__ */
filterdir = $(libdir)/gst
filter_LTLIBRARIES = libgstflxdec.la
libgstflxdec_la_SOURCES = gstflxdec.c flx_color.c
libgstflxdec_la_CFLAGS = $(GST_CFLAGS)
noinst_HEADERS = flx_fmt.h flx_color.h gstflxdec.h
/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <string.h>
#include <gst/gst.h>
#include "flx_color.h"
FlxColorSpaceConverter *
flx_colorspace_converter_new(gint width, gint height)
{
FlxColorSpaceConverter *new = g_malloc(sizeof(FlxColorSpaceConverter));
new->width = width;
new->height = height;
memset(new->palvec, 0, sizeof(new->palvec));
return new;
}
void
flx_colorspace_converter_destroy(FlxColorSpaceConverter *flxpal)
{
g_return_if_fail(flxpal != NULL);
g_free(flxpal);
}