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 static GstStaticPadTemplate gst_rtpgsmenc_sink_template =
49 GST_STATIC_PAD_TEMPLATE (
53 GST_STATIC_CAPS ( "audio/x-gsm, "
54 "rate = (int) [ 1000, 48000 ]"
58 static GstStaticPadTemplate gst_rtpgsmenc_src_template =
59 GST_STATIC_PAD_TEMPLATE (
63 GST_STATIC_CAPS ("application/x-rtp")
67 static void gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass);
68 static void gst_rtpgsmenc_base_init (GstRtpGSMEncClass * klass);
69 static void gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc);
70 static void gst_rtpgsmenc_chain (GstPad * pad, GstData *_data);
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, const 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),
87 (GBaseInitFunc) gst_rtpgsmenc_base_init,
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_base_init (GstRtpGSMEncClass * klass)
105 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
107 gst_element_class_add_pad_template (element_class,
108 gst_static_pad_template_get (&gst_rtpgsmenc_sink_template));
109 gst_element_class_add_pad_template (element_class,
110 gst_static_pad_template_get (&gst_rtpgsmenc_src_template));
111 gst_element_class_set_details (element_class, &gst_rtpgsmenc_details);
115 gst_rtpgsmenc_class_init (GstRtpGSMEncClass * klass)
117 GObjectClass *gobject_class;
118 GstElementClass *gstelement_class;
120 gobject_class = (GObjectClass *) klass;
121 gstelement_class = (GstElementClass *) klass;
123 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
125 gobject_class->set_property = gst_rtpgsmenc_set_property;
126 gobject_class->get_property = gst_rtpgsmenc_get_property;
128 gstelement_class->change_state = gst_rtpgsmenc_change_state;
132 gst_rtpgsmenc_init (GstRtpGSMEnc * rtpgsmenc)
134 rtpgsmenc->sinkpad = gst_pad_new_from_template (
135 gst_static_pad_template_get (&gst_rtpgsmenc_sink_template), "sink");
136 rtpgsmenc->srcpad = gst_pad_new_from_template (
137 gst_static_pad_template_get (&gst_rtpgsmenc_sink_template), "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, const GstCaps * caps)
155 GstRtpGSMEnc *rtpgsmenc;
156 GstStructure *structure;
159 rtpgsmenc = GST_RTP_GSM_ENC (gst_pad_get_parent (pad));
161 structure = gst_caps_get_structure (caps, 0);
163 ret = gst_structure_get_int (structure, "rate", &rtpgsmenc->frequency);
164 if (!ret) return GST_PAD_LINK_REFUSED;
166 /* Pre-calculate what we can */
167 rtpgsmenc->time_interval = GST_SECOND / (2 * rtpgsmenc->frequency);
169 return GST_PAD_LINK_OK;
174 gst_rtpgsmenc_htons (GstBuffer *buf)
178 /* FIXME: is this code correct or even sane at all? */
179 i = (gint16 *) GST_BUFFER_DATA(buf);
180 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
188 gst_rtpgsmenc_chain (GstPad * pad, GstData *_data)
190 GstBuffer *buf = GST_BUFFER (_data);
191 GstRtpGSMEnc *rtpgsmenc;
195 g_return_if_fail (pad != NULL);
196 g_return_if_fail (GST_IS_PAD (pad));
197 g_return_if_fail (buf != NULL);
199 rtpgsmenc = GST_RTP_GSM_ENC (GST_OBJECT_PARENT (pad));
201 g_return_if_fail (rtpgsmenc != NULL);
202 g_return_if_fail (GST_IS_RTP_GSM_ENC (rtpgsmenc));
204 if (GST_IS_EVENT (buf)) {
205 GstEvent *event = GST_EVENT (buf);
207 switch (GST_EVENT_TYPE (event)) {
208 case GST_EVENT_DISCONTINUOUS:
209 GST_DEBUG ("discont");
210 rtpgsmenc->next_time = 0;
211 gst_pad_event_default (pad, event);
214 gst_pad_event_default (pad, event);
219 /* We only need the header */
220 packet = rtp_packet_new_allocate (0, 0, 0);
222 rtp_packet_set_csrc_count (packet, 0);
223 rtp_packet_set_extension (packet, 0);
224 rtp_packet_set_padding (packet, 0);
225 rtp_packet_set_version (packet, RTP_VERSION);
226 rtp_packet_set_marker (packet, 0);
227 rtp_packet_set_ssrc (packet, g_htonl (rtpgsmenc->ssrc));
228 rtp_packet_set_seq (packet, g_htons (rtpgsmenc->seq));
229 rtp_packet_set_timestamp (packet, g_htonl ((guint32) rtpgsmenc->next_time / GST_SECOND));
230 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_GSM);
232 /* FIXME: According to RFC 1890, this is required, right? */
233 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
234 gst_rtpgsmenc_htons (buf);
237 outbuf = gst_buffer_new ();
238 GST_BUFFER_SIZE (outbuf) = rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
239 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
240 GST_BUFFER_TIMESTAMP (outbuf) = rtpgsmenc->next_time;
242 memcpy (GST_BUFFER_DATA (outbuf), packet->data, rtp_packet_get_packet_len (packet));
243 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len(packet), GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
245 GST_DEBUG ("gst_rtpgsmenc_chain: pushing buffer of size %d", GST_BUFFER_SIZE(outbuf));
246 gst_pad_push (rtpgsmenc->srcpad, GST_DATA (outbuf));
249 rtpgsmenc->next_time += rtpgsmenc->time_interval * GST_BUFFER_SIZE (buf);
251 rtp_packet_free (packet);
252 gst_buffer_unref (buf);
256 gst_rtpgsmenc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
258 GstRtpGSMEnc *rtpgsmenc;
260 /* it's not null if we got it, but it might not be ours */
261 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
262 rtpgsmenc = GST_RTP_GSM_ENC (object);
271 gst_rtpgsmenc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
273 GstRtpGSMEnc *rtpgsmenc;
275 /* it's not null if we got it, but it might not be ours */
276 g_return_if_fail (GST_IS_RTP_GSM_ENC (object));
277 rtpgsmenc = GST_RTP_GSM_ENC (object);
281 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
286 static GstElementStateReturn
287 gst_rtpgsmenc_change_state (GstElement * element)
289 GstRtpGSMEnc *rtpgsmenc;
291 g_return_val_if_fail (GST_IS_RTP_GSM_ENC (element), GST_STATE_FAILURE);
293 rtpgsmenc = GST_RTP_GSM_ENC (element);
295 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
297 /* if going down into NULL state, close the file if it's open */
298 switch (GST_STATE_TRANSITION (element)) {
299 case GST_STATE_NULL_TO_READY:
302 case GST_STATE_READY_TO_NULL:
309 /* if we haven't failed already, give the parent class a chance to ;-) */
310 if (GST_ELEMENT_CLASS (parent_class)->change_state)
311 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
313 return GST_STATE_SUCCESS;
317 gst_rtpgsmenc_plugin_init (GstPlugin * plugin)
319 return gst_element_register (plugin, "rtpgsmenc",
320 GST_RANK_NONE, GST_TYPE_RTP_GSM_ENC);