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 = {
26 "Codec/Parser/Network",
27 "Extracts GSM audio from RTP packets",
28 "Zeeshan Ali <zak147@yahoo.com>"
31 /* RtpGSMParse signals and args */
44 static GstStaticPadTemplate gst_rtpgsmparse_src_template =
45 GST_STATIC_PAD_TEMPLATE ("src",
48 GST_STATIC_CAPS ("audio/x-gsm, " "rate = (int) [ 1000, 48000 ]")
51 static GstStaticPadTemplate gst_rtpgsmparse_sink_template =
52 GST_STATIC_PAD_TEMPLATE ("sink",
55 GST_STATIC_CAPS ("application/x-rtp")
59 static void gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass);
60 static void gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass);
61 static void gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse);
63 static void gst_rtpgsmparse_chain (GstPad * pad, GstData * _data);
65 static void gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
66 const GValue * value, GParamSpec * pspec);
67 static void gst_rtpgsmparse_get_property (GObject * object, guint prop_id,
68 GValue * value, GParamSpec * pspec);
69 static GstElementStateReturn gst_rtpgsmparse_change_state (GstElement *
72 static GstElementClass *parent_class = NULL;
75 gst_rtpgsmparse_get_type (void)
77 static GType rtpgsmparse_type = 0;
79 if (!rtpgsmparse_type) {
80 static const GTypeInfo rtpgsmparse_info = {
81 sizeof (GstRtpGSMParseClass),
82 (GBaseInitFunc) gst_rtpgsmparse_base_init,
84 (GClassInitFunc) gst_rtpgsmparse_class_init,
87 sizeof (GstRtpGSMParse),
89 (GInstanceInitFunc) gst_rtpgsmparse_init,
93 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMParse",
94 &rtpgsmparse_info, 0);
96 return rtpgsmparse_type;
100 gst_rtpgsmparse_base_init (GstRtpGSMParseClass * klass)
102 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
104 gst_element_class_add_pad_template (element_class,
105 gst_static_pad_template_get (&gst_rtpgsmparse_src_template));
106 gst_element_class_add_pad_template (element_class,
107 gst_static_pad_template_get (&gst_rtpgsmparse_sink_template));
108 gst_element_class_set_details (element_class, &gst_rtp_gsmparse_details);
112 gst_rtpgsmparse_class_init (GstRtpGSMParseClass * klass)
114 GObjectClass *gobject_class;
115 GstElementClass *gstelement_class;
117 gobject_class = (GObjectClass *) klass;
118 gstelement_class = (GstElementClass *) klass;
120 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
122 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_FREQUENCY,
123 g_param_spec_int ("frequency", "frequency", "frequency",
124 G_MININT, G_MAXINT, 8000, G_PARAM_READWRITE));
126 gobject_class->set_property = gst_rtpgsmparse_set_property;
127 gobject_class->get_property = gst_rtpgsmparse_get_property;
129 gstelement_class->change_state = gst_rtpgsmparse_change_state;
133 gst_rtpgsmparse_init (GstRtpGSMParse * rtpgsmparse)
135 rtpgsmparse->srcpad =
136 gst_pad_new_from_template (gst_static_pad_template_get
137 (&gst_rtpgsmparse_src_template), "src");
138 rtpgsmparse->sinkpad =
139 gst_pad_new_from_template (gst_static_pad_template_get
140 (&gst_rtpgsmparse_sink_template), "sink");
141 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->srcpad);
142 gst_element_add_pad (GST_ELEMENT (rtpgsmparse), rtpgsmparse->sinkpad);
143 gst_pad_set_chain_function (rtpgsmparse->sinkpad, gst_rtpgsmparse_chain);
145 rtpgsmparse->frequency = 8000;
149 gst_rtpgsmparse_ntohs (GstBuffer * buf)
153 /* FIXME: is this code correct or even sane at all? */
154 i = (gint16 *) GST_BUFFER_DATA (buf);
155 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
157 for (; i < len; i++) {
163 gst_rtpgsm_caps_nego (GstRtpGSMParse * rtpgsmparse)
167 caps = gst_caps_new_simple ("audio/x-gsm",
168 "rate", G_TYPE_INT, rtpgsmparse->frequency);
170 gst_pad_try_set_caps (rtpgsmparse->srcpad, caps);
174 gst_rtpgsmparse_chain (GstPad * pad, GstData * _data)
176 GstBuffer *buf = GST_BUFFER (_data);
177 GstRtpGSMParse *rtpgsmparse;
182 g_return_if_fail (pad != NULL);
183 g_return_if_fail (GST_IS_PAD (pad));
184 g_return_if_fail (buf != NULL);
186 rtpgsmparse = GST_RTP_GSM_PARSE (GST_OBJECT_PARENT (pad));
188 g_return_if_fail (rtpgsmparse != NULL);
189 g_return_if_fail (GST_IS_RTP_GSM_PARSE (rtpgsmparse));
191 if (GST_IS_EVENT (buf)) {
192 GstEvent *event = GST_EVENT (buf);
194 gst_pad_event_default (pad, event);
199 if (GST_PAD_CAPS (rtpgsmparse->srcpad) == NULL) {
200 gst_rtpgsm_caps_nego (rtpgsmparse);
204 rtp_packet_new_copy_data (GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
206 pt = rtp_packet_get_payload_type (packet);
208 if (pt != PAYLOAD_GSM) {
209 g_warning ("Unexpected paload type %u\n", pt);
210 rtp_packet_free (packet);
211 gst_buffer_unref (buf);
215 outbuf = gst_buffer_new ();
216 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_payload_len (packet);
217 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
218 GST_BUFFER_TIMESTAMP (outbuf) =
219 g_ntohl (rtp_packet_get_timestamp (packet)) * GST_SECOND;
221 memcpy (GST_BUFFER_DATA (outbuf), rtp_packet_get_payload (packet),
222 GST_BUFFER_SIZE (outbuf));
224 GST_DEBUG ("gst_rtpgsmparse_chain: pushing buffer of size %d",
225 GST_BUFFER_SIZE (outbuf));
227 /* FIXME: According to RFC 1890, this is required, right? */
228 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
229 gst_rtpgsmparse_ntohs (outbuf);
232 gst_pad_push (rtpgsmparse->srcpad, GST_DATA (outbuf));
234 rtp_packet_free (packet);
235 gst_buffer_unref (buf);
239 gst_rtpgsmparse_set_property (GObject * object, guint prop_id,
240 const 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 rtpgsmparse->frequency = g_value_get_int (value);
258 gst_rtpgsmparse_get_property (GObject * object, guint prop_id, GValue * value,
261 GstRtpGSMParse *rtpgsmparse;
263 /* it's not null if we got it, but it might not be ours */
264 g_return_if_fail (GST_IS_RTP_GSM_PARSE (object));
265 rtpgsmparse = GST_RTP_GSM_PARSE (object);
269 g_value_set_int (value, rtpgsmparse->frequency);
272 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
277 static GstElementStateReturn
278 gst_rtpgsmparse_change_state (GstElement * element)
280 GstRtpGSMParse *rtpgsmparse;
282 g_return_val_if_fail (GST_IS_RTP_GSM_PARSE (element), GST_STATE_FAILURE);
284 rtpgsmparse = GST_RTP_GSM_PARSE (element);
286 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
288 switch (GST_STATE_TRANSITION (element)) {
289 case GST_STATE_NULL_TO_READY:
291 case GST_STATE_READY_TO_NULL:
297 /* if we haven't failed already, give the parent class a chance to ;-) */
298 if (GST_ELEMENT_CLASS (parent_class)->change_state)
299 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
301 return GST_STATE_SUCCESS;
305 gst_rtpgsmparse_plugin_init (GstPlugin * plugin)
307 return gst_element_register (plugin, "rtpgsmparse",
308 GST_RANK_NONE, GST_TYPE_RTP_GSM_PARSE);