2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 #include "alaw-encode.h"
22 #include "mulaw-conversion.h"
23 #include "alaw-conversion.h"
25 extern GstPadTemplate *alawenc_src_template, *alawenc_sink_template;
28 /* Stereo signals and args */
38 static void gst_alawenc_class_init (GstALawEncClass *klass);
39 static void gst_alawenc_init (GstALawEnc *alawenc);
41 static void gst_alawenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
42 static void gst_alawenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
44 static void gst_alawenc_chain (GstPad *pad, GstBuffer *buf);
47 static GstElementClass *parent_class = NULL;
48 /*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
51 static GstPadNegotiateReturn
52 alawenc_negotiate_sink (GstPad *pad, GstCaps **caps, gint counter)
56 GstALawEnc* alawenc=GST_ALAWENC (GST_OBJECT_PARENT (pad));
59 return GST_PAD_NEGOTIATE_FAIL;
61 tempcaps = gst_caps_copy(*caps);
63 gst_caps_set(tempcaps,"format",GST_PROPS_STRING("int"));
64 gst_caps_set(tempcaps,"law",GST_PROPS_INT(2));
65 gst_caps_set(tempcaps,"depth",GST_PROPS_INT(8));
66 gst_caps_set(tempcaps,"width",GST_PROPS_INT(8));
67 gst_caps_set(tempcaps,"signed",GST_PROPS_BOOLEAN(FALSE));
69 if (gst_pad_try_set_caps (alawenc->srcpad, tempcaps))
71 return GST_PAD_NEGOTIATE_AGREE;
74 gst_caps_unref (tempcaps);
75 return GST_PAD_NEGOTIATE_FAIL;
81 gst_alawenc_get_type(void) {
82 static GType alawenc_type = 0;
85 static const GTypeInfo alawenc_info = {
86 sizeof(GstALawEncClass), NULL,
88 (GClassInitFunc)gst_alawenc_class_init,
93 (GInstanceInitFunc)gst_alawenc_init,
95 alawenc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstALawEnc", &alawenc_info, 0);
101 gst_alawenc_class_init (GstALawEncClass *klass)
103 GObjectClass *gobject_class;
104 GstElementClass *gstelement_class;
106 gobject_class = (GObjectClass*)klass;
107 gstelement_class = (GstElementClass*)klass;
109 parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
111 gobject_class->set_property = gst_alawenc_set_property;
112 gobject_class->get_property = gst_alawenc_get_property;
116 gst_alawenc_init (GstALawEnc *alawenc)
118 alawenc->sinkpad = gst_pad_new_from_template(alawenc_sink_template,"sink");
119 alawenc->srcpad = gst_pad_new_from_template(alawenc_src_template,"src");
120 /*gst_pad_set_negotiate_function(alawenc->sinkpad, alawenc_negotiate_sink);*/
122 gst_element_add_pad(GST_ELEMENT(alawenc),alawenc->sinkpad);
123 gst_pad_set_chain_function(alawenc->sinkpad,gst_alawenc_chain);
124 gst_element_add_pad(GST_ELEMENT(alawenc),alawenc->srcpad);
128 gst_alawenc_chain (GstPad *pad,GstBuffer *buf)
135 g_return_if_fail(pad != NULL);
136 g_return_if_fail(GST_IS_PAD(pad));
137 g_return_if_fail(buf != NULL);
139 alawenc = GST_ALAWENC(GST_OBJECT_PARENT (pad));
140 g_return_if_fail(alawenc != NULL);
141 g_return_if_fail(GST_IS_ALAWENC(alawenc));
143 linear_data = (gint16 *)GST_BUFFER_DATA(buf);
144 outbuf=gst_buffer_new();
145 GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf)/4);
146 GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf)/2;
148 alaw_data = (guint8*)GST_BUFFER_DATA(outbuf);
149 mulaw_encode(linear_data,alaw_data,GST_BUFFER_SIZE(outbuf));
150 isdn_audio_ulaw2alaw(alaw_data,GST_BUFFER_SIZE(outbuf));
151 gst_buffer_unref(buf);
152 gst_pad_push(alawenc->srcpad,outbuf);
156 gst_alawenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
160 /* it's not null if we got it, but it might not be ours */
161 g_return_if_fail(GST_IS_ALAWENC(object));
162 alawenc = GST_ALAWENC(object);
171 gst_alawenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
175 /* it's not null if we got it, but it might not be ours */
176 g_return_if_fail(GST_IS_ALAWENC(object));
177 alawenc = GST_ALAWENC(object);
181 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);