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.
21 #include "gstrtpgsmenc.h"
23 /* elementfactory information */
24 static GstElementDetails gst_rtpgsmenc_details = {
25 "RTP GSM Audio Encoder",
28 "Encodes GSM audio into an RTP packet",
30 "Zeeshan Ali <zak147@yahoo.com>",
34 /* RtpGSMEnc signals and args */
47 GST_PAD_TEMPLATE_FACTORY (sink_factory,
54 "rate", GST_PROPS_INT_RANGE (1000, 48000)
58 GST_PAD_TEMPLATE_FACTORY (src_factory,
68 static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
69 static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
70 static void gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf);
71 static void gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
72 const GValue * value, GParamSpec * pspec);
73 static void gst_rtpgsmenc_get_property (GObject * object, guint prop_id,
74 GValue * value, GParamSpec * pspec);
75 static GstPadLinkReturn gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps);
76 static GstElementStateReturn gst_rtpgsmenc_change_state (GstElement * element);
78 static GstElementClass *parent_class = NULL;
80 static GType gst_rtpgsmenc_get_type (void)
82 static GType rtpgsmenc_type = 0;
84 if (!rtpgsmenc_type) {
85 static const GTypeInfo rtpgsmenc_info = {
86 sizeof (GstRtpGSMEncClass),
89 (GClassInitFunc) gst_rtpgsmenc_class_init,
92 sizeof (GstRtpGSMEnc),
94 (GInstanceInitFunc) gst_rtpgsmenc_init,
97 rtpgsmenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMEnc", &rtpgsmenc_info, 0);
99 return rtpgsmenc_type;
103 gst_rtpgsmenc_class_init (GstRtpGSMEncClass * 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 gobject_class->set_property = gst_rtpgsmenc_set_property;
114 gobject_class->get_property = gst_rtpgsmenc_get_property;
116 gstelement_class->change_state = gst_rtpgsmenc_change_state;
120 gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
122 rtpgsmenc->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
123 rtpgsmenc->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
124 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->sinkpad);
125 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->srcpad);
126 gst_pad_set_chain_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_chain);
127 gst_pad_set_link_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_sinkconnect);
129 rtpgsmenc->frequency = 8000;
131 rtpgsmenc->next_time = 0;
132 rtpgsmenc->time_interval = 0;
135 rtpgsmenc->ssrc = random ();
138 static GstPadLinkReturn
139 gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps)
141 GstRtpGSMEnc *rtpgsmenc;
143 rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
145 gst_caps_get_int (caps, "rate", &rtpgsmenc->frequency);
147 /* Pre-calculate what we can */
148 rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
150 return GST_PAD_LINK_OK;
155 gst_rtpgsmenc_htons (GstBuffer *buf)
159 /* FIXME: is this code correct or even sane at all? */
160 i = (gint16 *) GST_BUFFER_DATA(buf);
161 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
169 gst_rtpgsmenc_chain (GstPad * pad, GstBuffer * buf)
171 GstRtpGSMEnc *rtpgsmenc;
175 g_return_if_fail (pad != NULL);
176 g_return_if_fail (GST_IS_PAD (pad));
177 g_return_if_fail (buf != NULL);
179 rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
181 g_return_if_fail (rtpgsmenc != NULL);
182 g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
184 if (GST_IS_EVENT (buf)) {
185 GstEvent *event = GST_EVENT (buf);
187 switch (GST_EVENT_TYPE (event)) {
188 case GST_EVENT_DISCONTINUOUS:
189 GST_DEBUG (GST_CAT_EVENT, "discont");
190 rtpgsmenc->next_time = 0;
191 gst_pad_event_default (pad, event);
194 gst_pad_event_default (pad, event);
199 /* We only need the header */
200 packet = rtp_packet_new_allocate (0, 0, 0);
202 rtp_packet_set_csrc_count (packet, 0);
203 rtp_packet_set_extension (packet, 0);
204 rtp_packet_set_padding (packet, 0);
205 rtp_packet_set_version (packet, RTP_VERSION);
206 rtp_packet_set_marker (packet, 0);
207 rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
208 rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
209 rtp_packet_set_timestamp (packet, g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
210 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
212 /* FIXME: According to RFC 1890, this is required, right? */
213 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
214 gst_rtpgsmenc_htons (buf);
217 outbuf = gst_buffer_new ();
218 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
219 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
220 GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
222 memcpy (GST_BUFFER_DATA (outbuf), packet->data, rtp_packet_get_packet_len (packet));
223 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len(packet), GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
225 GST_DEBUG (0,"gst_rtpgsmenc_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
226 gst_pad_push (rtpgsmenc->srcpad, outbuf);
229 rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
231 rtp_packet_free (packet);
232 gst_buffer_unref (buf);
236 gst_rtpgsmenc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
238 GstRtpGSMEnc *rtpgsmenc;
240 /* it's not null if we got it, but it might not be ours */
241 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
242 rtpgsmenc = GST_RTP_GSM_ENC (object);
251 gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
253 GstRtpGSMEnc *rtpgsmenc;
255 /* it's not null if we got it, but it might not be ours */
256 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
257 rtpgsmenc = GST_RTP_GSM_ENC (object);
261 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
266 static GstElementStateReturn
267 gst_rtpgsmenc_change_state (GstElement * element)
269 GstRtpGSMEnc *rtpgsmenc;
271 g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
273 rtpgsmenc = GST_RTP_GSM_ENC (element);
275 GST_DEBUG (0, "state pending %d\n", GST_STATE_PENDING (element));
277 /* if going down into NULL state, close the file if it's open */
278 switch (GST_STATE_TRANSITION (element)) {
279 case GST_STATE_NULL_TO_READY:
282 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_rtpgsmenc_plugin_init (GModule * module, GstPlugin * plugin)
299 GstElementFactory *rtpgsmenc;
301 rtpgsmenc = gst_element_factory_new ("rtpgsmenc", GST_TYPE_RTP_GSM_ENC, &gst_rtpgsmenc_details);
302 g_return_val_if_fail (rtpgsmenc != NULL, FALSE);
304 gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (sink_factory));
305 gst_element_factory_add_pad_template (rtpgsmenc, GST_PAD_TEMPLATE_GET (src_factory));
307 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (rtpgsmenc));