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 */
47 static void gst_mulawenc_class_init (GstMuLawEncClass *klass);
48 static void gst_mulawenc_base_init (GstMuLawEncClass *klass);
49 static void gst_mulawenc_init (GstMuLawEnc *mulawenc);
51 static void gst_mulawenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
52 static void gst_mulawenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
54 static void gst_mulawenc_chain (GstPad *pad, GstData *_data);
57 static GstElementClass *parent_class = NULL;
58 /*static guint gst_stereo_signals[LAST_SIGNAL] = { 0 }; */
60 static GstPadLinkReturn
61 mulawenc_link (GstPad *pad, const GstCaps *caps)
65 GstStructure *structure;
68 GstMuLawEnc* mulawenc = GST_MULAWENC (GST_OBJECT_PARENT (pad));
70 structure = gst_caps_get_structure (caps, 0);
71 ret = gst_structure_get_int (structure, "rate", &rate);
72 ret = gst_structure_get_int (structure, "channels", &channels);
73 if (!ret) return GST_PAD_LINK_REFUSED;
75 tempcaps = gst_caps_new_simple ("audio/x-mulaw",
76 "depth", G_TYPE_INT, 8,
77 "width", G_TYPE_INT, 8,
78 "signed", G_TYPE_BOOLEAN, FALSE,
79 "rate", G_TYPE_INT, rate,
80 "channels", G_TYPE_INT, channels,
83 return gst_pad_try_set_caps (mulawenc->srcpad, tempcaps);
87 gst_mulawenc_get_type(void) {
88 static GType mulawenc_type = 0;
91 static const GTypeInfo mulawenc_info = {
92 sizeof(GstMuLawEncClass),
93 (GBaseInitFunc)gst_mulawenc_base_init,
95 (GClassInitFunc)gst_mulawenc_class_init,
100 (GInstanceInitFunc)gst_mulawenc_init,
102 mulawenc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMuLawEnc", &mulawenc_info, 0);
104 return mulawenc_type;
108 gst_mulawenc_base_init (GstMuLawEncClass *klass)
110 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
112 gst_element_class_add_pad_template (element_class, mulawenc_src_template);
113 gst_element_class_add_pad_template (element_class, mulawenc_sink_template);
114 gst_element_class_set_details (element_class, &mulawenc_details);
118 gst_mulawenc_class_init (GstMuLawEncClass *klass)
120 GObjectClass *gobject_class;
121 GstElementClass *gstelement_class;
123 gobject_class = (GObjectClass*)klass;
124 gstelement_class = (GstElementClass*)klass;
126 parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
128 gobject_class->set_property = gst_mulawenc_set_property;
129 gobject_class->get_property = gst_mulawenc_get_property;
133 gst_mulawenc_init (GstMuLawEnc *mulawenc)
135 mulawenc->sinkpad = gst_pad_new_from_template(mulawenc_sink_template,"sink");
136 mulawenc->srcpad = gst_pad_new_from_template(mulawenc_src_template,"src");
137 gst_pad_set_link_function (mulawenc->sinkpad, mulawenc_link);
139 gst_element_add_pad(GST_ELEMENT(mulawenc),mulawenc->sinkpad);
140 gst_pad_set_chain_function(mulawenc->sinkpad,gst_mulawenc_chain);
141 gst_element_add_pad(GST_ELEMENT(mulawenc),mulawenc->srcpad);
145 gst_mulawenc_chain (GstPad *pad,GstData *_data)
147 GstBuffer *buf = GST_BUFFER (_data);
148 GstMuLawEnc *mulawenc;
153 g_return_if_fail(pad != NULL);
154 g_return_if_fail(GST_IS_PAD(pad));
155 g_return_if_fail(buf != NULL);
157 mulawenc = GST_MULAWENC(GST_OBJECT_PARENT (pad));
158 g_return_if_fail(mulawenc != NULL);
159 g_return_if_fail(GST_IS_MULAWENC(mulawenc));
161 linear_data = (gint16 *)GST_BUFFER_DATA(buf);
162 outbuf=gst_buffer_new();
163 GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf)/4);
164 GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf)/2;
166 mulaw_data = (gint8*)GST_BUFFER_DATA(outbuf);
167 mulaw_encode(linear_data,mulaw_data,GST_BUFFER_SIZE(outbuf));
169 gst_buffer_unref(buf);
170 gst_pad_push(mulawenc->srcpad,GST_DATA (outbuf));
174 gst_mulawenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
176 GstMuLawEnc *mulawenc;
178 /* it's not null if we got it, but it might not be ours */
179 g_return_if_fail(GST_IS_MULAWENC(object));
180 mulawenc = GST_MULAWENC(object);
189 gst_mulawenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
191 GstMuLawEnc *mulawenc;
193 /* it's not null if we got it, but it might not be ours */
194 g_return_if_fail(GST_IS_MULAWENC(object));
195 mulawenc = GST_MULAWENC(object);
199 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);