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 "gstrtpL16enc.h"
27 /* elementfactory information */
28 static GstElementDetails gst_rtpL16enc_details = {
29 "RTP RAW Audio Encoder",
30 "Codec/Encoder/Network",
31 "Encodes Raw Audio into a RTP packet",
32 "Zeeshan Ali <zak147@yahoo.com>"
35 /* RtpL16Enc signals and args */
48 static GstStaticPadTemplate gst_rtpL16enc_sink_template =
49 GST_STATIC_PAD_TEMPLATE ("sink",
52 GST_STATIC_CAPS ("audio/x-raw-int, "
53 "endianness = (int) BYTE_ORDER, "
54 "signed = (boolean) true, "
57 "rate = (int) [ 1000, 48000 ], " "channels = (int) [ 1, 2 ]")
60 static GstStaticPadTemplate gst_rtpL16enc_src_template =
61 GST_STATIC_PAD_TEMPLATE ("src",
64 GST_STATIC_CAPS ("application/x-rtp")
67 static void gst_rtpL16enc_class_init (GstRtpL16EncClass * klass);
68 static void gst_rtpL16enc_base_init (GstRtpL16EncClass * klass);
69 static void gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc);
70 static void gst_rtpL16enc_chain (GstPad * pad, GstData * _data);
71 static void gst_rtpL16enc_set_property (GObject * object, guint prop_id,
72 const GValue * value, GParamSpec * pspec);
73 static void gst_rtpL16enc_get_property (GObject * object, guint prop_id,
74 GValue * value, GParamSpec * pspec);
75 static GstPadLinkReturn gst_rtpL16enc_sinkconnect (GstPad * pad,
76 const GstCaps * caps);
77 static GstElementStateReturn gst_rtpL16enc_change_state (GstElement * element);
79 static GstElementClass *parent_class = NULL;
82 gst_rtpL16enc_get_type (void)
84 static GType rtpL16enc_type = 0;
86 if (!rtpL16enc_type) {
87 static const GTypeInfo rtpL16enc_info = {
88 sizeof (GstRtpL16EncClass),
89 (GBaseInitFunc) gst_rtpL16enc_base_init,
91 (GClassInitFunc) gst_rtpL16enc_class_init,
94 sizeof (GstRtpL16Enc),
96 (GInstanceInitFunc) gst_rtpL16enc_init,
100 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpL16Enc",
103 return rtpL16enc_type;
107 gst_rtpL16enc_base_init (GstRtpL16EncClass * klass)
109 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
111 gst_element_class_add_pad_template (element_class,
112 gst_static_pad_template_get (&gst_rtpL16enc_sink_template));
113 gst_element_class_add_pad_template (element_class,
114 gst_static_pad_template_get (&gst_rtpL16enc_src_template));
115 gst_element_class_set_details (element_class, &gst_rtpL16enc_details);
119 gst_rtpL16enc_class_init (GstRtpL16EncClass * klass)
121 GObjectClass *gobject_class;
122 GstElementClass *gstelement_class;
124 gobject_class = (GObjectClass *) klass;
125 gstelement_class = (GstElementClass *) klass;
127 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
129 gobject_class->set_property = gst_rtpL16enc_set_property;
130 gobject_class->get_property = gst_rtpL16enc_get_property;
132 gstelement_class->change_state = gst_rtpL16enc_change_state;
136 gst_rtpL16enc_init (GstRtpL16Enc * rtpL16enc)
139 gst_pad_new_from_template (gst_static_pad_template_get
140 (&gst_rtpL16enc_sink_template), "sink");
142 gst_pad_new_from_template (gst_static_pad_template_get
143 (&gst_rtpL16enc_src_template), "src");
144 gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->sinkpad);
145 gst_element_add_pad (GST_ELEMENT (rtpL16enc), rtpL16enc->srcpad);
146 gst_pad_set_chain_function (rtpL16enc->sinkpad, gst_rtpL16enc_chain);
147 gst_pad_set_link_function (rtpL16enc->sinkpad, gst_rtpL16enc_sinkconnect);
149 rtpL16enc->frequency = 44100;
150 rtpL16enc->channels = 2;
152 rtpL16enc->next_time = 0;
153 rtpL16enc->time_interval = 0;
156 rtpL16enc->ssrc = random ();
159 static GstPadLinkReturn
160 gst_rtpL16enc_sinkconnect (GstPad * pad, const GstCaps * caps)
162 GstRtpL16Enc *rtpL16enc;
163 GstStructure *structure;
166 rtpL16enc = GST_RTP_L16_ENC (gst_pad_get_parent (pad));
168 structure = gst_caps_get_structure (caps, 0);
170 ret = gst_structure_get_int (structure, "rate", &rtpL16enc->frequency);
171 ret &= gst_structure_get_int (structure, "channels", &rtpL16enc->channels);
174 return GST_PAD_LINK_REFUSED;
176 /* Pre-calculate what we can */
177 rtpL16enc->time_interval =
178 GST_SECOND / (2 * rtpL16enc->channels * rtpL16enc->frequency);
180 return GST_PAD_LINK_OK;
185 gst_rtpL16enc_htons (GstBuffer * buf)
189 /* FIXME: is this code correct or even sane at all? */
190 i = (gint16 *) GST_BUFFER_DATA (buf);
191 len = i + GST_BUFFER_SIZE (buf) / sizeof (gint16 *);
193 for (; i < len; i++) {
199 gst_rtpL16enc_chain (GstPad * pad, GstData * _data)
201 GstBuffer *buf = GST_BUFFER (_data);
202 GstRtpL16Enc *rtpL16enc;
206 g_return_if_fail (pad != NULL);
207 g_return_if_fail (GST_IS_PAD (pad));
208 g_return_if_fail (buf != NULL);
210 rtpL16enc = GST_RTP_L16_ENC (GST_OBJECT_PARENT (pad));
212 g_return_if_fail (rtpL16enc != NULL);
213 g_return_if_fail (GST_IS_RTP_L16_ENC (rtpL16enc));
215 if (GST_IS_EVENT (buf)) {
216 GstEvent *event = GST_EVENT (buf);
218 switch (GST_EVENT_TYPE (event)) {
219 case GST_EVENT_DISCONTINUOUS:
220 GST_DEBUG ("discont");
221 rtpL16enc->next_time = 0;
222 gst_pad_event_default (pad, event);
225 gst_pad_event_default (pad, event);
230 /* We only need the header */
231 packet = rtp_packet_new_allocate (0, 0, 0);
233 rtp_packet_set_csrc_count (packet, 0);
234 rtp_packet_set_extension (packet, 0);
235 rtp_packet_set_padding (packet, 0);
236 rtp_packet_set_version (packet, RTP_VERSION);
237 rtp_packet_set_marker (packet, 0);
238 rtp_packet_set_ssrc (packet, g_htonl (rtpL16enc->ssrc));
239 rtp_packet_set_seq (packet, g_htons (rtpL16enc->seq));
240 rtp_packet_set_timestamp (packet,
241 g_htonl ((guint32) rtpL16enc->next_time / GST_SECOND));
243 if (rtpL16enc->channels == 1) {
244 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_MONO);
248 rtp_packet_set_payload_type (packet, (guint8) PAYLOAD_L16_STEREO);
251 /* FIXME: According to RFC 1890, this is required, right? */
252 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
253 gst_rtpL16enc_htons (buf);
256 outbuf = gst_buffer_new ();
257 GST_BUFFER_SIZE (outbuf) =
258 rtp_packet_get_packet_len (packet) + GST_BUFFER_SIZE (buf);
259 GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
260 GST_BUFFER_TIMESTAMP (outbuf) = rtpL16enc->next_time;
262 memcpy (GST_BUFFER_DATA (outbuf), packet->data,
263 rtp_packet_get_packet_len (packet));
264 memcpy (GST_BUFFER_DATA (outbuf) + rtp_packet_get_packet_len (packet),
265 GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
267 GST_DEBUG ("gst_rtpL16enc_chain: pushing buffer of size %d",
268 GST_BUFFER_SIZE (outbuf));
269 gst_pad_push (rtpL16enc->srcpad, GST_DATA (outbuf));
272 rtpL16enc->next_time += rtpL16enc->time_interval * GST_BUFFER_SIZE (buf);
274 rtp_packet_free (packet);
275 gst_buffer_unref (buf);
279 gst_rtpL16enc_set_property (GObject * object, guint prop_id,
280 const GValue * value, GParamSpec * pspec)
282 GstRtpL16Enc *rtpL16enc;
284 g_return_if_fail (GST_IS_RTP_L16_ENC (object));
285 rtpL16enc = GST_RTP_L16_ENC (object);
294 gst_rtpL16enc_get_property (GObject * object, guint prop_id, GValue * value,
297 GstRtpL16Enc *rtpL16enc;
299 g_return_if_fail (GST_IS_RTP_L16_ENC (object));
300 rtpL16enc = GST_RTP_L16_ENC (object);
304 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
309 static GstElementStateReturn
310 gst_rtpL16enc_change_state (GstElement * element)
312 GstRtpL16Enc *rtpL16enc;
314 g_return_val_if_fail (GST_IS_RTP_L16_ENC (element), GST_STATE_FAILURE);
316 rtpL16enc = GST_RTP_L16_ENC (element);
318 GST_DEBUG ("state pending %d\n", GST_STATE_PENDING (element));
320 /* if going down into NULL state, close the file if it's open */
321 switch (GST_STATE_TRANSITION (element)) {
322 case GST_STATE_NULL_TO_READY:
325 case GST_STATE_READY_TO_NULL:
332 /* if we haven't failed already, give the parent class a chance to ;-) */
333 if (GST_ELEMENT_CLASS (parent_class)->change_state)
334 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
336 return GST_STATE_SUCCESS;
340 gst_rtpL16enc_plugin_init (GstPlugin * plugin)
342 return gst_element_register (plugin, "rtpL16enc",
343 GST_RANK_NONE, GST_TYPE_RTP_L16_ENC);