/* 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 )