2 * Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
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.
26 #include <gst/rtp/gstrtpbuffer.h>
28 #include "gstrtph263ppay.h"
30 /* elementfactory information */
31 static const GstElementDetails gst_rtp_h263ppay_details =
32 GST_ELEMENT_DETAILS ("RTP packet payloader",
33 "Codec/Payloader/Network",
34 "Payload-encodes H263+ video in RTP packets (RFC 2429)",
35 "Wim Taymans <wim@fluendo.com>");
37 static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template =
38 GST_STATIC_PAD_TEMPLATE ("sink",
41 GST_STATIC_CAPS ("video/x-h263, "
42 "variant = (string) \"itu\", " "h263version = (string) \"h263p\"")
45 static GstStaticPadTemplate gst_rtp_h263p_pay_src_template =
46 GST_STATIC_PAD_TEMPLATE ("src",
49 GST_STATIC_CAPS ("application/x-rtp, "
50 "media = (string) \"video\", "
51 "payload = (int) [ 96, 127 ], "
52 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"")
55 static void gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass);
56 static void gst_rtp_h263p_pay_base_init (GstRtpH263PPayClass * klass);
57 static void gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay);
58 static void gst_rtp_h263p_pay_finalize (GObject * object);
60 static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload,
62 static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload *
63 payload, GstBuffer * buffer);
65 static GstBaseRTPPayloadClass *parent_class = NULL;
68 gst_rtp_h263p_pay_get_type (void)
70 static GType rtph263ppay_type = 0;
72 if (!rtph263ppay_type) {
73 static const GTypeInfo rtph263ppay_info = {
74 sizeof (GstRtpH263PPayClass),
75 (GBaseInitFunc) gst_rtp_h263p_pay_base_init,
77 (GClassInitFunc) gst_rtp_h263p_pay_class_init,
80 sizeof (GstRtpH263PPay),
82 (GInstanceInitFunc) gst_rtp_h263p_pay_init,
86 g_type_register_static (GST_TYPE_BASE_RTP_PAYLOAD, "GstRtpH263PPay",
87 &rtph263ppay_info, 0);
89 return rtph263ppay_type;
93 gst_rtp_h263p_pay_base_init (GstRtpH263PPayClass * klass)
95 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
97 gst_element_class_add_pad_template (element_class,
98 gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template));
99 gst_element_class_add_pad_template (element_class,
100 gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template));
102 gst_element_class_set_details (element_class, &gst_rtp_h263ppay_details);
106 gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
108 GObjectClass *gobject_class;
109 GstElementClass *gstelement_class;
110 GstBaseRTPPayloadClass *gstbasertppayload_class;
112 gobject_class = (GObjectClass *) klass;
113 gstelement_class = (GstElementClass *) klass;
114 gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
116 parent_class = g_type_class_peek_parent (klass);
118 gobject_class->finalize = gst_rtp_h263p_pay_finalize;
120 gstbasertppayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
121 gstbasertppayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
125 gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay)
127 rtph263ppay->adapter = gst_adapter_new ();
131 gst_rtp_h263p_pay_finalize (GObject * object)
133 GstRtpH263PPay *rtph263ppay;
135 rtph263ppay = GST_RTP_H263P_PAY (object);
137 g_object_unref (rtph263ppay->adapter);
138 rtph263ppay->adapter = NULL;
140 G_OBJECT_CLASS (parent_class)->finalize (object);
144 gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
146 gst_basertppayload_set_options (payload, "video", TRUE, "H263-1998", 90000);
147 gst_basertppayload_set_outcaps (payload, NULL);
154 gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
161 avail = gst_adapter_available (rtph263ppay->adapter);
167 /* This algorithm assumes the H263+ encoder sends complete frames in each
169 /* This algorithm implements the Follow-on packets method for packetization.
170 * This assumes low packet loss network. A more resilient method would be to
171 * separate large frames at synchronisation points (Segments) (See RFC 2429
172 * section 6). It would be interesting to have a property such as network
173 * quality to select between both packetization methods */
174 /* TODO Add VRC supprt (See RFC 2429 section 4.2) */
182 /* for picture start frames (non-fragmented), we need to remove the first
183 * two 0x00 bytes and set P=1 */
184 header_len = (fragmented ? 2 : 0);
186 towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
187 (GST_BASE_RTP_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
189 payload_len = header_len + towrite;
191 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
192 /* last fragment gets the marker bit set */
193 gst_rtp_buffer_set_marker (outbuf, avail > towrite ? 0 : 1);
195 payload = gst_rtp_buffer_get_payload (outbuf);
197 data = (guint8 *) gst_adapter_peek (rtph263ppay->adapter, towrite);
198 memcpy (&payload[header_len], data, towrite);
201 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
202 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
203 * | RR |P|V| PLEN |PEBIT|
204 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
206 payload[0] = fragmented ? 0x00 : 0x04;
209 GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_ts;
210 gst_adapter_flush (rtph263ppay->adapter, towrite);
212 ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263ppay), outbuf);
222 gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload,
225 GstRtpH263PPay *rtph263ppay;
229 rtph263ppay = GST_RTP_H263P_PAY (payload);
231 size = GST_BUFFER_SIZE (buffer);
232 rtph263ppay->first_ts = GST_BUFFER_TIMESTAMP (buffer);
234 /* we always encode and flush a full picture */
235 gst_adapter_push (rtph263ppay->adapter, buffer);
236 ret = gst_rtp_h263p_pay_flush (rtph263ppay);
242 gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
244 return gst_element_register (plugin, "rtph263ppay",
245 GST_RANK_NONE, GST_TYPE_RTP_H263P_PAY);