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 = {
27 "Extracts GSM audio from RTP packets",
28 "Zeeshan Ali <zak147@yahoo.com>"
31 /* RtpGSMParse signals and args */
44 GST_PAD_TEMPLATE_FACTORY (src_factory,
51 "rate", GST_PROPS_INT_RANGE (1000, 48000))
54 GST_PAD_TEMPLATE_FACTORY (sink_factory,
64 static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
65 static void gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass);
66 static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
68 static void gst_rtpgsmparse_chain (GstPad * pad, GstData *_data);
70 static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
71 const GValue * value, GParamSpec * pspec);
72 static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
73 GValue * value, GParamSpec * pspec);
74 static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement * element);
76 static GstElementClass *parent_class = NULL;
78 static GType gst_rtpgsmparse_get_type (void)
80 static GType rtpgsmparse_type = 0;
82 if (!rtpgsmparse_type) {
83 static const GTypeInfo rtpgsmparse_info = {
84 sizeof (GstRtpGSMParseClass),
85 (GBaseInitFunc) gst_rtpgsmparse_base_init,
87 (GClassInitFunc) gst_rtpgsmparse_class_init,
90 sizeof (GstRtpGSMParse),
92 (GInstanceInitFunc) gst_rtpgsmparse_init,
95 rtpgsmparse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse", &rtpgsmparse_info, 0);
97 return rtpgsmparse_type;
101 gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass)
103 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
105 gst_element_class_add_pad_template (element_class,
106 GST_PAD_TEMPLATE_GET (src_factory));
107 gst_element_class_add_pad_template (element_class,
108 GST_PAD_TEMPLATE_GET (sink_factory));
109 gst_element_class_set_details (element_class, &gst_rtp_gsmparse_details);
113 gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
115 GObjectClass *gobject_class;
116 GstElementClass *gstelement_class;
118 gobject_class = (GObjectClass *) klass;
119 gstelement_class = (GstElementClass *) klass;
121 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
123 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY,
124 g_param_spec_int ("frequency", "frequency", "frequency",
125 G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
127 gobject_class->set_property = gst_rtpgsmparse_set_property;
128 gobject_class->get_property = gst_rtpgsmparse_get_property;
130 gstelement_class->change_state = gst_rtpgsmparse_change_state;
134 gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
136 rtpgsmparse->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
137 rtpgsmparse->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
138 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
139 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
140 gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
142 rtpgsmparse->frequency = 8000;
146 gst_rtpgsmparse_ntohs (GstBuffer *buf)
150 /* FIXME: is this code correct or even sane at all? */
151 i = (gint16 *) GST_BUFFER_DATA(buf);
152 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
160 gst_rtpgsm_caps_nego (GstRtpGSMParse *rtpgsmparse)
164 caps = GST_CAPS_NEW (
167 "rate", GST_PROPS_INT (rtpgsmparse->frequency));
169 gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
173 gst_rtpgsmparse_chain (GstPad * pad, GstData *_data)
175 GstBuffer *buf = GST_BUFFER (_data);
176 GstRtpGSMParse *rtpgsmparse;
181 g_return_if_fail (pad != NULL);
182 g_return_if_fail (GST_IS_PAD (pad));
183 g_return_if_fail (buf != NULL);
185 rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
187 g_return_if_fail (rtpgsmparse != NULL);
188 g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
190 if (GST_IS_EVENT (buf)) {
191 GstEvent *event = GST_EVENT (buf);
192 gst_pad_event_default (pad, event);
197 if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
198 gst_rtpgsm_caps_nego (rtpgsmparse);
201 packet = rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
203 pt = rtp_packet_get_payload_type (packet);
205 if (pt != PAYLOAD_GSM) {
206 g_warning ("Unexpected paload type %u\n", pt);
207 rtp_packet_free (packet);
208 gst_buffer_unref (buf);
212 outbuf = gst_buffer_new ();
213 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
214 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
215 GST_BUFFER_TIMESTAMP (outbuf) = g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
217 memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet), GST_BUFFER_SIZE (outbuf));
219 GST_DEBUG ("gst_rtpgsmparse_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
221 /* FIXME: According to RFC 1890, this is required, right? */
222 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
223 gst_rtpgsmparse_ntohs (outbuf);
226 gst_pad_push (rtpgsmparse->srcpad, GST_DATA (outbuf));
228 rtp_packet_free (packet);
229 gst_buffer_unref (buf);
233 gst_rtpgsmparse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
235 GstRtpGSMParse *rtpgsmparse;
237 /* it's not null if we got it, but it might not be ours */
238 g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
239 rtpgsmparse = GST_RTP_GSM_PARSE (object);
243 rtpgsmparse->frequency = g_value_get_int (value);
251 gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
253 GstRtpGSMParse *rtpgsmparse;
255 /* it's not null if we got it, but it might not be ours */
256 g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
257 rtpgsmparse = GST_RTP_GSM_PARSE (object);
261 g_value_set_int (value, rtpgsmparse->frequency);
264 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
269 static GstElementStateReturn
270 gst_rtpgsmparse_change_state (GstElement * element)
272 GstRtpGSMParse *rtpgsmparse;
274 g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
276 rtpgsmparse = GST_RTP_GSM_PARSE (element);
278 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
280 switch (GST_STATE_TRANSITION (element)) {
281 case GST_STATE_NULL_TO_READY:
283 case GST_STATE_READY_TO_NULL:
289 /* if we haven't failed already, give the parent class a chance to ;-) */
290 if (GST_ELEMENT_CLASS (parent_class)->change_state)
291 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
293 return GST_STATE_SUCCESS;
297 gst_rtpgsmparse_plugin_init (GstPlugin * plugin)
299 return gst_element_register (plugin, "rtpgsmparse",
300 GST_RANK_NONE, GST_TYPE_RTP_GSM_PARSE);