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-rw-r--r--gst/audiofx/Makefile.am6
-rw-r--r--gst/audiofx/audiofx.c7
-rw-r--r--gst/audiofx/audioinvert.c278
-rw-r--r--gst/audiofx/audioinvert.h60
4 files changed, 347 insertions, 4 deletions
diff --git a/gst/audiofx/Makefile.am b/gst/audiofx/Makefile.am
index 82fc9aa3..0b8be7a9 100644
--- a/gst/audiofx/Makefile.am
+++ b/gst/audiofx/Makefile.am
@@ -4,7 +4,8 @@ plugin_LTLIBRARIES = libgstaudiofx.la
# sources used to compile this plug-in
libgstaudiofx_la_SOURCES = audiofx.c\
- audiopanorama.c
+ audiopanorama.c \
+ audioinvert.c
# flags used to compile this plugin
libgstaudiofx_la_CFLAGS = $(GST_CFLAGS) \
@@ -16,4 +17,5 @@ libgstaudiofx_la_LIBADD = $(GST_LIBS) \
libgstaudiofx_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
# headers we need but don't want installed
-noinst_HEADERS = audiopanorama.h
+noinst_HEADERS = audiopanorama.h \
+ audioinvert.h
diff --git a/gst/audiofx/audiofx.c b/gst/audiofx/audiofx.c
index 907c0545..541aa143 100644
--- a/gst/audiofx/audiofx.c
+++ b/gst/audiofx/audiofx.c
@@ -26,6 +26,7 @@
#include <gst/controller/gstcontroller.h>
#include "audiopanorama.h"
+#include "audioinvert.h"
/* entry point to initialize the plug-in
* initialize the plug-in itself
@@ -38,8 +39,10 @@ plugin_init (GstPlugin * plugin)
/* initialize gst controller library */
gst_controller_init (NULL, NULL);
- return gst_element_register (plugin, "audiopanorama", GST_RANK_NONE,
- GST_TYPE_AUDIO_PANORAMA);
+ return (gst_element_register (plugin, "audiopanorama", GST_RANK_NONE,
+ GST_TYPE_AUDIO_PANORAMA) &&
+ gst_element_register (plugin, "audioinvert", GST_RANK_NONE,
+ GST_TYPE_AUDIO_INVERT));
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
diff --git a/gst/audiofx/audioinvert.c b/gst/audiofx/audioinvert.c
new file mode 100644
index 00000000..3c808552
--- /dev/null
+++ b/gst/audiofx/audioinvert.c
@@ -0,0 +1,278 @@
+/*
+ * 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/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
+};
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/x-raw-float, "
+ "rate = (int) [ 1, MAX ], "
+ "channels = (int) [ 1, MAX ], "
+ "endianness = (int) BYTE_ORDER, " "width = (int) 32; "
+ "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 = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("audio/x-raw-float, "
+ "rate = (int) [ 1, MAX ], "
+ "channels = (int) [ 1, MAX], "
+ "endianness = (int) BYTE_ORDER, " "width = (int) 32; "
+ "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")
+ );
+
+#define DEBUG_INIT(bla) \
+ GST_DEBUG_CATEGORY_INIT (gst_audio_invert_debug, "audioinvert", 0, "audioinvert element");
+
+GST_BOILERPLATE_FULL (GstAudioInvert, gst_audio_invert, GstBaseTransform,
+ GST_TYPE_BASE_TRANSFORM, 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_set_caps (GstBaseTransform * base,
+ GstCaps * incaps, GstCaps * outcaps);
+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);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_template));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_template));
+ gst_element_class_set_details (element_class, &element_details);
+}
+
+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_BASE_TRANSFORM_CLASS (klass)->set_caps =
+ GST_DEBUG_FUNCPTR (gst_audio_invert_set_caps);
+ 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;
+ }
+}
+
+/* GstBaseTransform vmethod implementations */
+
+static gboolean
+gst_audio_invert_set_caps (GstBaseTransform * base, GstCaps * incaps,
+ GstCaps * outcaps)
+{
+ GstAudioInvert *filter = GST_AUDIO_INVERT (base);
+ const GstStructure *structure;
+ gboolean ret;
+ gint width;
+ const gchar *fmt;
+
+ /*GST_INFO ("incaps are %" GST_PTR_FORMAT, incaps); */
+
+ structure = gst_caps_get_structure (incaps, 0);
+
+ ret = gst_structure_get_int (structure, "width", &width);
+ if (!ret)
+ goto no_width;
+ filter->width = width / 8;
+
+
+ fmt = gst_structure_get_name (structure);
+ if (!strcmp (fmt, "audio/x-raw-int"))
+ filter->process = (GstAudioInvertProcessFunc)
+ gst_audio_invert_transform_int;
+ else
+ filter->process = (GstAudioInvertProcessFunc)
+ gst_audio_invert_transform_float;
+
+ return TRUE;
+
+no_width:
+ GST_DEBUG ("no width in caps");
+ return FALSE;
+}
+
+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;
+ }
+}
+
+
+/* this function does the actual processing
+ */
+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;
+}
diff --git a/gst/audiofx/audioinvert.h b/gst/audiofx/audioinvert.h
new file mode 100644
index 00000000..15ac7b3e
--- /dev/null
+++ b/gst/audiofx/audioinvert.h
@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+
+#ifndef __GST_AUDIO_INVERT_H__
+#define __GST_AUDIO_INVERT_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstbasetransform.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_AUDIO_INVERT (gst_audio_invert_get_type())
+#define GST_AUDIO_INVERT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_INVERT,GstAudioInvert))
+#define GST_IS_AUDIO_INVERT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_INVERT))
+#define GST_AUDIO_INVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) ,GST_TYPE_AUDIO_INVERT,GstAudioInvertClass))
+#define GST_IS_AUDIO_INVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) ,GST_TYPE_AUDIO_INVERT))
+#define GST_AUDIO_INVERT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) ,GST_TYPE_AUDIO_INVERT,GstAudioInvertClass))
+
+typedef struct _GstAudioInvert GstAudioInvert;
+typedef struct _GstAudioInvertClass GstAudioInvertClass;
+
+typedef void (*GstAudioInvertProcessFunc)(GstAudioInvert*, guint8*, guint);
+
+struct _GstAudioInvert {
+ GstBaseTransform element;
+
+ gfloat degree;
+
+ /* < private > */
+ GstAudioInvertProcessFunc process;
+ gint width;
+};
+
+struct _GstAudioInvertClass {
+ GstBaseTransformClass parent;
+};
+
+GType gst_audio_invert_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_AUDIO_INVERT_H__ */
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