From ad6ed7da2d0d15eecc924dfe408320652481e885 Mon Sep 17 00:00:00 2001 From: Andy Wingo Date: Sat, 22 Dec 2001 23:26:33 +0000 Subject: Initial revision Original commit message from CVS: Initial revision --- gst/stereo/gststereo.c | 226 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 226 insertions(+) create mode 100644 gst/stereo/gststereo.c (limited to 'gst/stereo/gststereo.c') diff --git a/gst/stereo/gststereo.c b/gst/stereo/gststereo.c new file mode 100644 index 00000000..622dd5d4 --- /dev/null +++ b/gst/stereo/gststereo.c @@ -0,0 +1,226 @@ +/* Gnome-Streamer + * 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. + */ + +#include + + +static GstElementDetails stereo_details = { + "Stereo effect", + "Filter/Effect", + "Muck with the stereo signal, enhance it's 'stereo-ness'", + VERSION, + "Erik Walthinsen ", + "(C) 1999", +}; + + +/* Stereo signals and args */ +enum { + /* FILL ME */ + LAST_SIGNAL +}; + +enum { + ARG_0, + ARG_ACTIVE, + ARG_STEREO +}; + + +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, GstBuffer *buf); + +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), NULL, + 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_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,GstBuffer *buf) +{ + 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,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 (GModule *module, GstPlugin *plugin) +{ + GstElementFactory *factory; + + factory = gst_elementfactory_new("stereo",GST_TYPE_STEREO, + &stereo_details); + g_return_val_if_fail(factory != NULL, FALSE); + gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory)); + + return TRUE; +} + +GstPluginDesc plugin_desc = { + GST_VERSION_MAJOR, + GST_VERSION_MINOR, + "stereo", + plugin_init +}; + -- cgit v1.2.1