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.
25 #include "gstrtpgsmenc.h"
27 /* elementfactory information */
28 static GstElementDetails gst_rtpgsmenc_details = {
29 "RTP GSM Audio Encoder",
30 "Codec/Encoder/Network",
31 "Encodes GSM audio into an RTP packet",
32 "Zeeshan Ali <zak147@yahoo.com>"
35 /* RtpGSMEnc signals and args */
48 GST_PAD_TEMPLATE_FACTORY (sink_factory,
55 "rate", GST_PROPS_INT_RANGE (1000, 48000)
59 GST_PAD_TEMPLATE_FACTORY (src_factory,
69 static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
70 static void gst_rtpgsmenc_base_init (GstRtpGSMEncClass * klass);
71 static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
72 static void gst_rtpgsmenc_chain (GstPad * pad, GstData *_data);
73 static void gst_rtpgsmenc_set_property (GObject * object, guint prop_id,
74 const GValue * value, GParamSpec * pspec);
75 static void gst_rtpgsmenc_get_property (GObject * object, guint prop_id,
76 GValue * value, GParamSpec * pspec);
77 static GstPadLinkReturn gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps);
78 static GstElementStateReturn gst_rtpgsmenc_change_state (GstElement * element);
80 static GstElementClass *parent_class = NULL;
82 static GType gst_rtpgsmenc_get_type (void)
84 static GType rtpgsmenc_type = 0;
86 if (!rtpgsmenc_type) {
87 static const GTypeInfo rtpgsmenc_info = {
88 sizeof (GstRtpGSMEncClass),
89 (GBaseInitFunc) gst_rtpgsmenc_base_init,
91 (GClassInitFunc) gst_rtpgsmenc_class_init,
94 sizeof (GstRtpGSMEnc),
96 (GInstanceInitFunc) gst_rtpgsmenc_init,
99 rtpgsmenc_type = g_type_register_static (GST_TYPE_ELEMENT, "GstRtpGSMEnc", &rtpgsmenc_info, 0);
101 return rtpgsmenc_type;
105 gst_rtpgsmenc_base_init (GstRtpGSMEncClass * klass)
107 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
109 gst_element_class_add_pad_template (element_class,
110 GST_PAD_TEMPLATE_GET (sink_factory));
111 gst_element_class_add_pad_template (element_class,
112 GST_PAD_TEMPLATE_GET (src_factory));
113 gst_element_class_set_details (element_class, &gst_rtpgsmenc_details);
117 gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass)
119 GObjectClass *gobject_class;
120 GstElementClass *gstelement_class;
122 gobject_class = (GObjectClass *) klass;
123 gstelement_class = (GstElementClass *) klass;
125 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
127 gobject_class->set_property = gst_rtpgsmenc_set_property;
128 gobject_class->get_property = gst_rtpgsmenc_get_property;
130 gstelement_class->change_state = gst_rtpgsmenc_change_state;
134 gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
136 rtpgsmenc->sinkpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (sink_factory), "sink");
137 rtpgsmenc->srcpad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (src_factory), "src");
138 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->sinkpad);
139 gst_element_add_pad (GST_ELEMENT (rtpgsmenc), rtpgsmenc->srcpad);
140 gst_pad_set_chain_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_chain);
141 gst_pad_set_link_function (rtpgsmenc->sinkpad, gst_rtpgsmenc_sinkconnect);
143 rtpgsmenc->frequency = 8000;
145 rtpgsmenc->next_time = 0;
146 rtpgsmenc->time_interval = 0;
149 rtpgsmenc->ssrc = random ();
152 static GstPadLinkReturn
153 gst_rtpgsmenc_sinkconnect (GstPad * pad, GstCaps * caps)
155 GstRtpGSMEnc *rtpgsmenc;
157 rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
159 gst_caps_get_int (caps, "rate", &rtpgsmenc->frequency);
161 /* Pre-calculate what we can */
162 rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
164 return GST_PAD_LINK_OK;
169 gst_rtpgsmenc_htons (GstBuffer *buf)
173 /* FIXME: is this code correct or even sane at all? */
174 i = (gint16 *) GST_BUFFER_DATA(buf);
175 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
183 gst_rtpgsmenc_chain (GstPad * pad, GstData *_data)
185 GstBuffer *buf = GST_BUFFER (_data);
186 GstRtpGSMEnc *rtpgsmenc;
190 g_return_if_fail (pad != NULL);
191 g_return_if_fail (GST_IS_PAD (pad));
192 g_return_if_fail (buf != NULL);
194 rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
196 g_return_if_fail (rtpgsmenc != NULL);
197 g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
199 if (GST_IS_EVENT (buf)) {
200 GstEvent *event = GST_EVENT (buf);
202 switch (GST_EVENT_TYPE (event)) {
203 case GST_EVENT_DISCONTINUOUS:
204 GST_DEBUG ("discont");
205 rtpgsmenc->next_time = 0;
206 gst_pad_event_default (pad, event);
209 gst_pad_event_default (pad, event);
214 /* We only need the header */
215 packet = rtp_packet_new_allocate (0, 0, 0);
217 rtp_packet_set_csrc_count (packet, 0);
218 rtp_packet_set_extension (packet, 0);
219 rtp_packet_set_padding (packet, 0);
220 rtp_packet_set_version (packet, RTP_VERSION);
221 rtp_packet_set_marker (packet, 0);
222 rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
223 rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
224 rtp_packet_set_timestamp (packet, g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
225 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
227 /* FIXME: According to RFC 1890, this is required, right? */
228 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
229 gst_rtpgsmenc_htons (buf);
232 outbuf = gst_buffer_new ();
233 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
234 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
235 GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
237 memcpy (GST_BUFFER_DATA (outbuf), packet->data, rtp_packet_get_packet_len (packet));
238 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len(packet), GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
240 GST_DEBUG ("gst_rtpgsmenc_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
241 gst_pad_push (rtpgsmenc->srcpad, GST_DATA (outbuf));
244 rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
246 rtp_packet_free (packet);
247 gst_buffer_unref (buf);
251 gst_rtpgsmenc_set_property (GObject * object, guint prop_id, const 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);
266 gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
268 GstRtpGSMEnc *rtpgsmenc;
270 /* it's not null if we got it, but it might not be ours */
271 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
272 rtpgsmenc = GST_RTP_GSM_ENC (object);
276 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
281 static GstElementStateReturn
282 gst_rtpgsmenc_change_state (GstElement * element)
284 GstRtpGSMEnc *rtpgsmenc;
286 g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
288 rtpgsmenc = GST_RTP_GSM_ENC (element);
290 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
292 /* if going down into NULL state, close the file if it's open */
293 switch (GST_STATE_TRANSITION (element)) {
294 case GST_STATE_NULL_TO_READY:
297 case GST_STATE_READY_TO_NULL:
304 /* if we haven't failed already, give the parent class a chance to ;-) */
305 if (GST_ELEMENT_CLASS (parent_class)->change_state)
306 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
308 return GST_STATE_SUCCESS;
312 gst_rtpgsmenc_plugin_init (GstPlugin * plugin)
314 return gst_element_register (plugin, "rtpgsmenc",
315 GST_RANK_NONE, GST_TYPE_RTP_GSM_ENC);