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
20 #include "gstrtpgsmparse.h"
21 #include "gstrtp-common.h"
23 /* elementfactory information */
24 static GstElementDetails gst_rtp_gsmparse_details = {
28 "Extracts GSM audio from RTP packets",
30 "Zeeshan Ali <zak147@yahoo.com>",
34 /* RtpGSMParse signals and args */
47 GST_PAD_TEMPLATE_FACTORY (src_factory,
54 "rate", GST_PROPS_INT_RANGE (1000, 48000))
57 GST_PAD_TEMPLATE_FACTORY (sink_factory,
67 static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
68 static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
70 static void gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf);
72 static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
73 const GValue * value, GParamSpec * pspec);
74 static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
75 GValue * value, GParamSpec * pspec);
76 static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement * element);
78 static GstElementClass *parent_class = NULL;
80 static GType gst_rtpgsmparse_get_type (void)
82 static GType rtpgsmparse_type = 0;
84 if (!rtpgsmparse_type) {
85 static const GTypeInfo rtpgsmparse_info = {
86 sizeof (GstRtpGSMParseClass),
89 (GClassInitFunc) gst_rtpgsmparse_class_init,
92 sizeof (GstRtpGSMParse),
94 (GInstanceInitFunc) gst_rtpgsmparse_init,
97 rtpgsmparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse", &rtpgsmparse_info, 0);
99 return rtpgsmparse_type;
103 gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
105 GObjectClass *gobject_class;
106 GstElementClass *gstelement_class;
108 gobject_class = (GObjectClass *) klass;
109 gstelement_class = (GstElementClass *) klass;
111 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
113 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY,
114 g_param_spec_int ("frequency", "frequency", "frequency",
115 G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
117 gobject_class->set_property = gst_rtpgsmparse_set_property;
118 gobject_class->get_property = gst_rtpgsmparse_get_property;
120 gstelement_class->change_state = gst_rtpgsmparse_change_state;
124 gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
126 rtpgsmparse->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
127 rtpgsmparse->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
128 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
129 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
130 gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
132 rtpgsmparse->frequency = 8000;
136 gst_rtpgsmparse_ntohs (GstBuffer *buf)
140 /* FIXME: is this code correct or even sane at all? */
141 i = (gint16 *) GST_BUFFER_DATA(buf);
142 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
150 gst_rtpgsm_caps_nego (GstRtpGSMParse *rtpgsmparse)
154 caps = GST_CAPS_NEW (
157 "rate", GST_PROPS_INT (rtpgsmparse->frequency));
159 gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
163 gst_rtpgsmparse_chain (GstPad * pad, GstBuffer * buf)
165 GstRtpGSMParse *rtpgsmparse;
170 g_return_if_fail (pad != NULL);
171 g_return_if_fail (GST_IS_PAD (pad));
172 g_return_if_fail (buf != NULL);
174 rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
176 g_return_if_fail (rtpgsmparse != NULL);
177 g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
179 if (GST_IS_EVENT (buf)) {
180 GstEvent *event = GST_EVENT (buf);
181 gst_pad_event_default (pad, event);
186 if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
187 gst_rtpgsm_caps_nego (rtpgsmparse);
190 packet = rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
192 pt = rtp_packet_get_payload_type (packet);
194 if (pt != PAYLOAD_GSM) {
195 g_warning ("Unexpected paload type %u\n", pt);
196 rtp_packet_free (packet);
197 gst_buffer_unref (buf);
201 outbuf = gst_buffer_new ();
202 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
203 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
204 GST_BUFFER_TIMESTAMP (outbuf) = g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
206 memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet), GST_BUFFER_SIZE (outbuf));
208 GST_DEBUG ("gst_rtpgsmparse_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
210 /* FIXME: According to RFC 1890, this is required, right? */
211 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
212 gst_rtpgsmparse_ntohs (outbuf);
215 gst_pad_push (rtpgsmparse->srcpad, outbuf);
217 rtp_packet_free (packet);
218 gst_buffer_unref (buf);
222 gst_rtpgsmparse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
224 GstRtpGSMParse *rtpgsmparse;
226 /* it's not null if we got it, but it might not be ours */
227 g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
228 rtpgsmparse = GST_RTP_GSM_PARSE (object);
232 rtpgsmparse->frequency = g_value_get_int (value);
240 gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
242 GstRtpGSMParse *rtpgsmparse;
244 /* it's not null if we got it, but it might not be ours */
245 g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
246 rtpgsmparse = GST_RTP_GSM_PARSE (object);
250 g_value_set_int (value, rtpgsmparse->frequency);
253 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
258 static GstElementStateReturn
259 gst_rtpgsmparse_change_state (GstElement * element)
261 GstRtpGSMParse *rtpgsmparse;
263 g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
265 rtpgsmparse = GST_RTP_GSM_PARSE (element);
267 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
269 switch (GST_STATE_TRANSITION (element)) {
270 case GST_STATE_NULL_TO_READY:
272 case GST_STATE_READY_TO_NULL:
278 /* if we haven't failed already, give the parent class a chance to ;-) */
279 if (GST_ELEMENT_CLASS (parent_class)->change_state)
280 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
282 return GST_STATE_SUCCESS;
286 gst_rtpgsmparse_plugin_init (GModule * module, GstPlugin * plugin)
288 GstElementFactory *rtpgsmparse;
290 rtpgsmparse = gst_element_factory_new ("rtpgsmparse", GST_TYPE_RTP_GSM_PARSE, &gst_rtp_gsmparse_details);
291 g_return_val_if_fail (rtpgsmparse != NULL, FALSE);
293 gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (src_factory));
294 gst_element_factory_add_pad_template (rtpgsmparse, GST_PAD_TEMPLATE_GET (sink_factory));
296 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmparse));