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.
24 #include "mulaw-encode.h"
25 #include "mulaw-conversion.h"
27 extern GstPadTemplate *mulawenc_src_template, *mulawenc_sink_template;
29 /* elementfactory information */
30 static GstElementDetails mulawenc_details = {
31 "PCM to Mu Law conversion",
32 "Codec/Encoder/Audio",
33 "Convert 16bit PCM to 8bit mu law",
34 "Zaheer Merali <zaheer@bellworldwide.net>"
37 /* Stereo signals and args */
49 static void gst_mulawenc_class_init (GstMuLawEncClass * klass);
50 static void gst_mulawenc_base_init (GstMuLawEncClass * klass);
51 static void gst_mulawenc_init (GstMuLawEnc * mulawenc);
53 static void gst_mulawenc_set_property (GObject * object, guint prop_id,
54 const GValue * value, GParamSpec * pspec);
55 static void gst_mulawenc_get_property (GObject * object, guint prop_id,
56 GValue * value, GParamSpec * pspec);
58 static void gst_mulawenc_chain (GstPad * pad, GstData * _data);
61 static GstElementClass *parent_class = NULL;
63 /*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
65 static GstPadLinkReturn
66 mulawenc_link (GstPad * pad, const GstCaps * caps)
70 GstStructure *structure;
73 GstMuLawEnc *mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
75 structure = gst_caps_get_structure (caps, 0);
76 ret = gst_structure_get_int (structure, "rate", &rate);
77 ret = gst_structure_get_int (structure, "channels", &channels);
79 return GST_PAD_LINK_REFUSED;
81 tempcaps = gst_caps_new_simple ("audio/x-mulaw",
82 "depth", G_TYPE_INT, 8,
83 "width", G_TYPE_INT, 8,
84 "signed", G_TYPE_BOOLEAN, FALSE,
85 "rate", G_TYPE_INT, rate, "channels", G_TYPE_INT, channels, NULL);
87 return gst_pad_try_set_caps (mulawenc->srcpad, tempcaps);
91 gst_mulawenc_get_type (void)
93 static GType mulawenc_type = 0;
96 static const GTypeInfo mulawenc_info = {
97 sizeof (GstMuLawEncClass),
98 (GBaseInitFunc) gst_mulawenc_base_init,
100 (GClassInitFunc) gst_mulawenc_class_init,
103 sizeof (GstMuLawEnc),
105 (GInstanceInitFunc) gst_mulawenc_init,
108 g_type_register_static (GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info,
111 return mulawenc_type;
115 gst_mulawenc_base_init (GstMuLawEncClass * klass)
117 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
119 gst_element_class_add_pad_template (element_class, mulawenc_src_template);
120 gst_element_class_add_pad_template (element_class, mulawenc_sink_template);
121 gst_element_class_set_details (element_class, &mulawenc_details);
125 gst_mulawenc_class_init (GstMuLawEncClass * klass)
127 GObjectClass *gobject_class;
128 GstElementClass *gstelement_class;
130 gobject_class = (GObjectClass *) klass;
131 gstelement_class = (GstElementClass *) klass;
133 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
135 gobject_class->set_property = gst_mulawenc_set_property;
136 gobject_class->get_property = gst_mulawenc_get_property;
140 gst_mulawenc_init (GstMuLawEnc * mulawenc)
143 gst_pad_new_from_template (mulawenc_sink_template, "sink");
144 mulawenc->srcpad = gst_pad_new_from_template (mulawenc_src_template, "src");
145 gst_pad_set_link_function (mulawenc->sinkpad, mulawenc_link);
147 gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->sinkpad);
148 gst_pad_set_chain_function (mulawenc->sinkpad, gst_mulawenc_chain);
149 gst_element_add_pad (GST_ELEMENT (mulawenc), mulawenc->srcpad);
153 gst_mulawenc_chain (GstPad * pad, GstData * _data)
155 GstBuffer *buf = GST_BUFFER (_data);
156 GstMuLawEnc *mulawenc;
161 g_return_if_fail (pad != NULL);
162 g_return_if_fail (GST_IS_PAD (pad));
163 g_return_if_fail (buf != NULL);
165 mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
166 g_return_if_fail (mulawenc != NULL);
167 g_return_if_fail (GST_IS_MULAWENC (mulawenc));
169 linear_data = (gint16 *) GST_BUFFER_DATA (buf);
170 outbuf = gst_buffer_new ();
171 GST_BUFFER_DATA (outbuf) =
172 (gchar *) g_new (gint16, GST_BUFFER_SIZE (buf) / 4);
173 GST_BUFFER_SIZE (outbuf) = GST_BUFFER_SIZE (buf) / 2;
175 mulaw_data = (gint8 *) GST_BUFFER_DATA (outbuf);
176 mulaw_encode (linear_data, mulaw_data, GST_BUFFER_SIZE (outbuf));
178 gst_buffer_unref (buf);
179 gst_pad_push (mulawenc->srcpad, GST_DATA (outbuf));
183 gst_mulawenc_set_property (GObject * object, guint prop_id,
184 const GValue * value, GParamSpec * pspec)
186 GstMuLawEnc *mulawenc;
188 /* it's not null if we got it, but it might not be ours */
189 g_return_if_fail (GST_IS_MULAWENC (object));
190 mulawenc = GST_MULAWENC (object);
199 gst_mulawenc_get_property (GObject * object, guint prop_id, GValue * value,
202 GstMuLawEnc *mulawenc;
204 /* it's not null if we got it, but it might not be ours */
205 g_return_if_fail (GST_IS_MULAWENC (object));
206 mulawenc = GST_MULAWENC (object);
210 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);