/* GStreamer * Copyright (C) <1999> Erik Walthinsen * * 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. */ /* This effect is borrowed from xmms-0.6.1, though I mangled it so badly in * the process of copying it over that the xmms people probably won't want * any credit for it ;-) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include /* elementfactory information */ static GstElementDetails stereo_details = GST_ELEMENT_DETAILS ("Stereo effect", "Filter/Effect/Audio", "Muck with the stereo signal to enhance its 'stereo-ness'", "Erik Walthinsen "); /* Stereo signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0, ARG_ACTIVE, ARG_STEREO }; static void gst_stereo_base_init (gpointer g_class); static void gst_stereo_class_init (GstStereoClass * klass); static void gst_stereo_init (GstStereo * stereo); static void gst_stereo_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_stereo_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_stereo_chain (GstPad * pad, GstData * _data); static GstElementClass *parent_class = NULL; /*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */ GType gst_stereo_get_type (void) { static GType stereo_type = 0; if (!stereo_type) { static const GTypeInfo stereo_info = { sizeof (GstStereoClass), gst_stereo_base_init, NULL, (GClassInitFunc) gst_stereo_class_init, NULL, NULL, sizeof (GstStereo), 0, (GInstanceInitFunc) gst_stereo_init, }; stereo_type = g_type_register_static (GST_TYPE_ELEMENT, "GstStereo", &stereo_info, 0); } return stereo_type; } static void gst_stereo_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details (element_class, &stereo_details); } static void gst_stereo_class_init (GstStereoClass * 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_ACTIVE, g_param_spec_int ("active", "active", "active", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE)); /* CHECKME */ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_STEREO, g_param_spec_float ("stereo", "stereo", "stereo", 0.0, 1.0, 0.0, G_PARAM_READWRITE)); /* CHECKME */ gobject_class->set_property = gst_stereo_set_property; gobject_class->get_property = gst_stereo_get_property; } static void gst_stereo_init (GstStereo * stereo) { stereo->sinkpad = gst_pad_new ("sink", GST_PAD_SINK); gst_element_add_pad (GST_ELEMENT (stereo), stereo->sinkpad); gst_pad_set_chain_function (stereo->sinkpad, gst_stereo_chain); stereo->srcpad = gst_pad_new ("src", GST_PAD_SRC); gst_element_add_pad (GST_ELEMENT (stereo), stereo->srcpad); stereo->active = FALSE; stereo->stereo = 2.5; } static void gst_stereo_chain (GstPad * pad, GstData * _data) { GstBuffer *buf = GST_BUFFER (_data); GstStereo *stereo; gint16 *data; gint samples; gint i; gdouble avg, ldiff, rdiff, tmp, mul; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (buf != NULL); stereo = GST_STEREO (GST_OBJECT_PARENT (pad)); g_return_if_fail (stereo != NULL); g_return_if_fail (GST_IS_STEREO (stereo)); /* FIXME */ /* if (buf->meta) */ /* memcpy(&stereo->meta,buf->meta,sizeof(stereo->meta)); */ if (stereo->active) { /*if (stereo->meta.channels == 2 && stereo->meta.format == AFMT_S16_LE) { */ data = (gint16 *) GST_BUFFER_DATA (buf); samples = GST_BUFFER_SIZE (buf) / 2; mul = stereo->stereo; for (i = 0; i < samples / 2; i += 2) { avg = (data[i] + data[i + 1]) / 2; ldiff = data[i] - avg; rdiff = data[i + 1] - avg; tmp = avg + ldiff * mul; if (tmp < -32768) tmp = -32768; if (tmp > 32767) tmp = 32767; data[i] = tmp; tmp = avg + rdiff * mul; if (tmp < -32768) tmp = -32768; if (tmp > 32767) tmp = 32767; data[i + 1] = tmp; } /*} */ } gst_pad_push (stereo->srcpad, GST_DATA (buf)); } static void gst_stereo_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstStereo *stereo; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_STEREO (object)); stereo = GST_STEREO (object); switch (prop_id) { case ARG_ACTIVE: stereo->active = g_value_get_int (value); break; case ARG_STEREO: stereo->stereo = g_value_get_float (value) * 10.0; break; default: break; } } static void gst_stereo_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstStereo *stereo; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_STEREO (object)); stereo = GST_STEREO (object); switch (prop_id) { case ARG_ACTIVE: g_value_set_int (value, stereo->active); break; case ARG_STEREO: g_value_set_float (value, stereo->stereo / 10.0); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "stereo", GST_RANK_NONE, GST_TYPE_STEREO); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "stereo", "Muck with the stereo signal, enhance it's 'stereo-ness'", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)