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239 lines
6.3 KiB
C
239 lines
6.3 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* This effect is borrowed from xmms-0.6.1, though I mangled it so badly in
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* the process of copying it over that the xmms people probably won't want
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* any credit for it ;-)
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gststereo.h>
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/* elementfactory information */
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static GstElementDetails stereo_details = GST_ELEMENT_DETAILS (
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"Stereo effect",
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"Filter/Effect/Audio",
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"Muck with the stereo signal to enhance its 'stereo-ness'",
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"Erik Walthinsen <omega@cse.ogi.edu>"
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);
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/* Stereo signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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ARG_ACTIVE,
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ARG_STEREO
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};
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static void gst_stereo_base_init (gpointer g_class);
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static void gst_stereo_class_init (GstStereoClass *klass);
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static void gst_stereo_init (GstStereo *stereo);
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static void gst_stereo_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_stereo_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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static void gst_stereo_chain (GstPad *pad, GstData *_data);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_stereo_get_type(void) {
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static GType stereo_type = 0;
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if (!stereo_type) {
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static const GTypeInfo stereo_info = {
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sizeof(GstStereoClass),
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gst_stereo_base_init,
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NULL,
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(GClassInitFunc)gst_stereo_class_init,
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NULL,
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NULL,
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sizeof(GstStereo),
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0,
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(GInstanceInitFunc)gst_stereo_init,
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};
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stereo_type = g_type_register_static(GST_TYPE_ELEMENT, "GstStereo", &stereo_info, 0);
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}
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return stereo_type;
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}
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static void
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gst_stereo_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (element_class, &stereo_details);
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}
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static void
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gst_stereo_class_init (GstStereoClass *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
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g_param_spec_int("active","active","active",
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G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_STEREO,
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g_param_spec_float("stereo","stereo","stereo",
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0.0,1.0,0.0,G_PARAM_READWRITE)); /* CHECKME */
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gobject_class->set_property = gst_stereo_set_property;
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gobject_class->get_property = gst_stereo_get_property;
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}
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static void
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gst_stereo_init (GstStereo *stereo)
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{
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stereo->sinkpad = gst_pad_new("sink",GST_PAD_SINK);
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gst_element_add_pad(GST_ELEMENT(stereo),stereo->sinkpad);
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gst_pad_set_chain_function(stereo->sinkpad,gst_stereo_chain);
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stereo->srcpad = gst_pad_new("src",GST_PAD_SRC);
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gst_element_add_pad(GST_ELEMENT(stereo),stereo->srcpad);
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stereo->active = FALSE;
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stereo->stereo = 2.5;
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}
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static void
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gst_stereo_chain (GstPad *pad,GstData *_data)
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{
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GstBuffer *buf = GST_BUFFER (_data);
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GstStereo *stereo;
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gint16 *data;
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gint samples;
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gint i;
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gdouble avg,ldiff,rdiff,tmp,mul;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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stereo = GST_STEREO(GST_OBJECT_PARENT (pad));
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g_return_if_fail(stereo != NULL);
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g_return_if_fail(GST_IS_STEREO(stereo));
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/* FIXME */
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/* if (buf->meta) */
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/* memcpy(&stereo->meta,buf->meta,sizeof(stereo->meta)); */
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if (stereo->active) {
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/*if (stereo->meta.channels == 2 && stereo->meta.format == AFMT_S16_LE) { */
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data = (gint16 *)GST_BUFFER_DATA(buf);
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samples = GST_BUFFER_SIZE(buf) / 2;
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mul = stereo->stereo;
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for (i = 0; i < samples / 2; i += 2) {
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avg = (data[i] + data[i + 1]) / 2;
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ldiff = data[i] - avg;
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rdiff = data[i + 1] - avg;
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tmp = avg + ldiff * mul;
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if (tmp < -32768)
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tmp = -32768;
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if (tmp > 32767)
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tmp = 32767;
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data[i] = tmp;
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tmp = avg + rdiff * mul;
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if (tmp < -32768)
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tmp = -32768;
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if (tmp > 32767)
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tmp = 32767;
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data[i + 1] = tmp;
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}
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/*} */
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}
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gst_pad_push(stereo->srcpad,GST_DATA (buf));
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}
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static void
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gst_stereo_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstStereo *stereo;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_STEREO(object));
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stereo = GST_STEREO(object);
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switch (prop_id) {
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case ARG_ACTIVE:
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stereo->active = g_value_get_int (value);
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break;
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case ARG_STEREO:
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stereo->stereo = g_value_get_float (value) * 10.0;
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break;
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default:
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break;
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}
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}
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static void
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gst_stereo_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstStereo *stereo;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_STEREO(object));
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stereo = GST_STEREO(object);
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switch (prop_id) {
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case ARG_ACTIVE:
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g_value_set_int (value, stereo->active);
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break;
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case ARG_STEREO:
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g_value_set_float (value, stereo->stereo / 10.0);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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plugin_init (GstPlugin *plugin)
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{
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return gst_element_register (plugin, "stereo", GST_RANK_NONE, GST_TYPE_STEREO);
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}
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GST_PLUGIN_DEFINE (
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"stereo",
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"Muck with the stereo signal, enhance it's 'stereo-ness'",
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plugin_init,
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VERSION,
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GST_LICENSE,
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GST_PACKAGE,
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GST_ORIGIN
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)
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