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Initial revision
Original commit message from CVS: Initial revision
This commit is contained in:
Andy Wingo
commit
9b6939b996
2 changed files with 294 additions and 0 deletions
226
gst/audiofx/gststereo.c
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226
gst/audiofx/gststereo.c
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/* Gnome-Streamer
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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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#include <gststereo.h>
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static GstElementDetails stereo_details = {
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"Stereo effect",
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"Filter/Effect",
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"Muck with the stereo signal, enhance it's 'stereo-ness'",
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VERSION,
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"Erik Walthinsen <omega@cse.ogi.edu>",
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"(C) 1999",
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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_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, GstBuffer *buf);
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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), NULL,
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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_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,GstBuffer *buf)
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{
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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,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 (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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factory = gst_elementfactory_new("stereo",GST_TYPE_STEREO,
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&stereo_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"stereo",
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plugin_init
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};
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68
gst/audiofx/gststereo.h
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68
gst/audiofx/gststereo.h
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@ -0,0 +1,68 @@
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/* Gnome-Streamer
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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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#ifndef __GST_STEREO_H__
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#define __GST_STEREO_H__
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#include <config.h>
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#include <gst/gst.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_STEREO \
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(gst_stereo_get_type())
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#define GST_STEREO(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_STEREO,GstStereo))
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#define GST_STEREO_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_STEREO,GstStereo))
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#define GST_IS_STEREO(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_STEREO))
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#define GST_IS_STEREO_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_STEREO))
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typedef struct _GstStereo GstStereo;
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typedef struct _GstStereoClass GstStereoClass;
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struct _GstStereo {
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GstElement element;
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GstPad *sinkpad,*srcpad;
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gint8 active;
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gfloat stereo;
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};
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struct _GstStereoClass {
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GstElementClass parent_class;
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};
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GType gst_stereo_get_type(void);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_STEREO_H__ */
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