gstreamer/gst/audiofx/audioinvert.c

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/*
* GStreamer
* Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
* 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.
*/
/**
* SECTION:element-audioinvert
* @short_description: Swaps upper and lower half of audio samples
*
* <refsect2>
* Swaps upper and lower half of audio samples. Mixing an inverted sample on top of
* the original with a slight delay can produce effects that sound like resonance.
* Creating a stereo sample from a mono source, with one channel inverted produces wide-stereo sounds.
* <title>Example launch line</title>
* <para>
* <programlisting>
* gst-launch audiotestsrc wave=saw ! audioinvert invert=0.4 ! alsasink
* gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audioinvert invert=0.4 ! alsasink
* gst-launch audiotestsrc wave=saw ! audioconvert ! audioinvert invert=0.4 ! audioconvert ! alsasink
* </programlisting>
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/audio/audio.h>
#include <gst/audio/gstaudiofilter.h>
#include <gst/controller/gstcontroller.h>
#include "audioinvert.h"
#define GST_CAT_DEFAULT gst_audio_invert_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static const GstElementDetails element_details =
GST_ELEMENT_DETAILS ("AudioInvert",
"Filter/Effect/Audio",
"Swaps upper and lower half of audio samples",
"Sebastian Dröge <slomo@circular-chaos.org>");
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_DEGREE
};
#define ALLOWED_CAPS \
"audio/x-raw-int," \
" depth=(int)16," \
" width=(int)16," \
" endianness=(int)BYTE_ORDER," \
" signed=(bool)TRUE," \
" rate=(int)[1,MAX]," \
" channels=(int)[1,MAX]; " \
"audio/x-raw-float," \
" width=(int)32," \
" endianness=(int)BYTE_ORDER," \
" rate=(int)[1,MAX]," \
" channels=(int)[1,MAX]"
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_audio_invert_debug, "audioinvert", 0, "audioinvert element");
GST_BOILERPLATE_FULL (GstAudioInvert, gst_audio_invert, GstAudioFilter,
GST_TYPE_AUDIO_FILTER, DEBUG_INIT);
static void gst_audio_invert_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_audio_invert_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_audio_invert_setup (GstAudioFilter * filter,
GstRingBufferSpec * format);
static GstFlowReturn gst_audio_invert_transform_ip (GstBaseTransform * base,
GstBuffer * buf);
static void gst_audio_invert_transform_int (GstAudioInvert * filter,
gint16 * data, guint num_samples);
static void gst_audio_invert_transform_float (GstAudioInvert * filter,
gfloat * data, guint num_samples);
/* GObject vmethod implementations */
static void
gst_audio_invert_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstCaps *caps;
gst_element_class_set_details (element_class, &element_details);
caps = gst_caps_from_string (ALLOWED_CAPS);
gst_audio_filter_class_add_pad_templates (GST_AUDIO_FILTER_CLASS (klass),
caps);
gst_caps_unref (caps);
}
static void
gst_audio_invert_class_init (GstAudioInvertClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
gobject_class->set_property = gst_audio_invert_set_property;
gobject_class->get_property = gst_audio_invert_get_property;
g_object_class_install_property (gobject_class, PROP_DEGREE,
g_param_spec_float ("degree", "Degree",
"Degree of inversion", 0.0, 1.0,
0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
GST_AUDIO_FILTER_CLASS (klass)->setup =
GST_DEBUG_FUNCPTR (gst_audio_invert_setup);
GST_BASE_TRANSFORM_CLASS (klass)->transform_ip =
GST_DEBUG_FUNCPTR (gst_audio_invert_transform_ip);
}
static void
gst_audio_invert_init (GstAudioInvert * filter, GstAudioInvertClass * klass)
{
filter->degree = 0.0;
filter->width = 0;
gst_base_transform_set_in_place (GST_BASE_TRANSFORM (filter), TRUE);
}
static void
gst_audio_invert_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAudioInvert *filter = GST_AUDIO_INVERT (object);
switch (prop_id) {
case PROP_DEGREE:
filter->degree = g_value_get_float (value);
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (filter),
filter->degree == 0.0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_audio_invert_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAudioInvert *filter = GST_AUDIO_INVERT (object);
switch (prop_id) {
case PROP_DEGREE:
g_value_set_float (value, filter->degree);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* GstAudioFilter vmethod implementations */
static gboolean
gst_audio_invert_setup (GstAudioFilter * base, GstRingBufferSpec * format)
{
GstAudioInvert *filter = GST_AUDIO_INVERT (base);
gboolean ret = TRUE;
if (format->type == GST_BUFTYPE_FLOAT && format->width == 32)
filter->process = (GstAudioInvertProcessFunc)
gst_audio_invert_transform_float;
else if (format->type == GST_BUFTYPE_LINEAR && format->width == 16)
filter->process = (GstAudioInvertProcessFunc)
gst_audio_invert_transform_int;
else
ret = FALSE;
filter->width = format->width / 8;
return ret;
}
static void
gst_audio_invert_transform_int (GstAudioInvert * filter,
gint16 * data, guint num_samples)
{
gint i;
gfloat dry = 1.0 - filter->degree;
glong val;
for (i = 0; i < num_samples; i++) {
val = (*data) * dry + (-1 - (*data)) * filter->degree;
*data++ = (gint16) CLAMP (val, G_MININT16, G_MAXINT16);
}
}
static void
gst_audio_invert_transform_float (GstAudioInvert * filter,
gfloat * data, guint num_samples)
{
gint i;
gfloat dry = 1.0 - filter->degree;
glong val;
for (i = 0; i < num_samples; i++) {
val = (*data) * dry - (*data) * filter->degree;
*data++ = val;
}
}
/* GstBaseTransform vmethod implementations */
static GstFlowReturn
gst_audio_invert_transform_ip (GstBaseTransform * base, GstBuffer * buf)
{
GstAudioInvert *filter = GST_AUDIO_INVERT (base);
guint num_samples = GST_BUFFER_SIZE (buf) / filter->width;
if (!gst_buffer_is_writable (buf))
return GST_FLOW_OK;
filter->process (filter, GST_BUFFER_DATA (buf), num_samples);
return GST_FLOW_OK;
}