2 * Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.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 #define DEFAULT_FRAGMENTATION_MODE GST_FRAGMENTATION_MODE_NORMAL
35 PROP_FRAGMENTATION_MODE
38 #define GST_TYPE_FRAGMENTATION_MODE (gst_fragmentation_mode_get_type())
40 gst_fragmentation_mode_get_type (void)
42 static GType fragmentation_mode_type = 0;
43 static const GEnumValue fragmentation_mode[] = {
44 {GST_FRAGMENTATION_MODE_NORMAL, "Normal", "normal"},
45 {GST_FRAGMENTATION_MODE_SYNC, "Fragment at sync points", "sync"},
49 if (!fragmentation_mode_type) {
50 fragmentation_mode_type =
51 g_enum_register_static ("GstFragmentationMode", fragmentation_mode);
53 return fragmentation_mode_type;
57 GST_DEBUG_CATEGORY_STATIC (rtph263ppay_debug);
58 #define GST_CAT_DEFAULT rtph263ppay_debug
60 static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template =
61 GST_STATIC_PAD_TEMPLATE ("sink",
64 GST_STATIC_CAPS ("video/x-h263, " "variant = (string) \"itu\" ")
67 static GstStaticPadTemplate gst_rtp_h263p_pay_src_template =
68 GST_STATIC_PAD_TEMPLATE ("src",
71 GST_STATIC_CAPS ("application/x-rtp, "
72 "media = (string) \"video\", "
73 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
74 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; "
76 "media = (string) \"video\", "
77 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
78 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"")
81 static void gst_rtp_h263p_pay_finalize (GObject * object);
83 static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
84 const GValue * value, GParamSpec * pspec);
85 static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
86 GValue * value, GParamSpec * pspec);
88 static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload,
90 static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload *
91 payload, GstBuffer * buffer);
93 GST_BOILERPLATE (GstRtpH263PPay, gst_rtp_h263p_pay, GstBaseRTPPayload,
94 GST_TYPE_BASE_RTP_PAYLOAD);
97 gst_rtp_h263p_pay_base_init (gpointer klass)
99 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
101 gst_element_class_add_pad_template (element_class,
102 gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template));
103 gst_element_class_add_pad_template (element_class,
104 gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template));
106 gst_element_class_set_details_simple (element_class, "RTP H263 payloader",
107 "Codec/Payloader/Network",
108 "Payload-encodes H263/+/++ video in RTP packets (RFC 4629)",
109 "Wim Taymans <wim.taymans@gmail.com>");
113 gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
115 GObjectClass *gobject_class;
116 GstBaseRTPPayloadClass *gstbasertppayload_class;
118 gobject_class = (GObjectClass *) klass;
119 gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
121 gobject_class->finalize = gst_rtp_h263p_pay_finalize;
122 gobject_class->set_property = gst_rtp_h263p_pay_set_property;
123 gobject_class->get_property = gst_rtp_h263p_pay_get_property;
125 gstbasertppayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
126 gstbasertppayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
128 g_object_class_install_property (G_OBJECT_CLASS (klass),
129 PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode",
130 "Fragmentation Mode",
131 "Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE,
132 DEFAULT_FRAGMENTATION_MODE,
133 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
135 GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay",
136 0, "rtph263ppay (RFC 4629)");
140 gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay,
141 GstRtpH263PPayClass * klass)
143 rtph263ppay->adapter = gst_adapter_new ();
145 rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE;
149 gst_rtp_h263p_pay_finalize (GObject * object)
151 GstRtpH263PPay *rtph263ppay;
153 rtph263ppay = GST_RTP_H263P_PAY (object);
155 g_object_unref (rtph263ppay->adapter);
156 rtph263ppay->adapter = NULL;
158 G_OBJECT_CLASS (parent_class)->finalize (object);
162 gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
166 gst_basertppayload_set_options (payload, "video", TRUE, "H263-1998", 90000);
167 res = gst_basertppayload_set_outcaps (payload, NULL);
173 gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
174 const GValue * value, GParamSpec * pspec)
176 GstRtpH263PPay *rtph263ppay;
178 rtph263ppay = GST_RTP_H263P_PAY (object);
181 case PROP_FRAGMENTATION_MODE:
182 rtph263ppay->fragmentation_mode = g_value_get_enum (value);
185 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
191 gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
192 GValue * value, GParamSpec * pspec)
194 GstRtpH263PPay *rtph263ppay;
196 rtph263ppay = GST_RTP_H263P_PAY (object);
199 case PROP_FRAGMENTATION_MODE:
200 g_value_set_enum (value, rtph263ppay->fragmentation_mode);
203 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
209 gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
216 avail = gst_adapter_available (rtph263ppay->adapter);
221 /* This algorithm assumes the H263/+/++ encoder sends complete frames in each
223 /* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
224 * This algorithm implements the Follow-on packets method for packetization.
225 * This assumes low packet loss network.
226 * With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
227 * This algorithm separates large frames at synchronisation points (Segments)
228 * (See RFC 4629 section 6). It would be interesting to have a property such as network
229 * quality to select between both packetization methods */
230 /* TODO Add VRC supprt (See RFC 4629 section 5.2) */
238 gboolean found_gob = FALSE;
240 if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
241 /* start after 1st gop possible */
242 guint parsed_len = 3;
243 const guint8 *parse_data = NULL;
245 parse_data = gst_adapter_peek (rtph263ppay->adapter, avail);
247 /* Check if we have a gob or eos , eossbs */
248 /* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
249 if (avail >= 3 && *parse_data == 0 && *(parse_data + 1) == 0
250 && *(parse_data + 2) >= 0x80) {
251 GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
254 /* Find next and cut the packet accordingly */
255 /* TODO we should get as many gobs as possible until MTU is reached, this
256 * code seems to just get one GOB per packet */
257 while (parsed_len + 2 < avail) {
258 if (parse_data[parsed_len] == 0 && parse_data[parsed_len + 1] == 0
259 && parse_data[parsed_len + 2] >= 0x80) {
260 next_gop = parsed_len;
261 GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d",
269 /* for picture start frames (non-fragmented), we need to remove the first
270 * two 0x00 bytes and set P=1 */
271 header_len = (fragmented && !found_gob) ? 2 : 0;
273 towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
274 (GST_BASE_RTP_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
277 towrite = MIN (next_gop, towrite);
279 payload_len = header_len + towrite;
281 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
282 /* last fragment gets the marker bit set */
283 gst_rtp_buffer_set_marker (outbuf, avail > towrite ? 0 : 1);
285 payload = gst_rtp_buffer_get_payload (outbuf);
287 gst_adapter_copy (rtph263ppay->adapter, &payload[header_len], 0, towrite);
290 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
291 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
292 * | RR |P|V| PLEN |PEBIT|
293 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
295 /* if fragmented or gop header , write p bit =1 */
296 payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
299 GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_timestamp;
300 GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
302 gst_adapter_flush (rtph263ppay->adapter, towrite);
304 ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263ppay), outbuf);
314 gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload,
317 GstRtpH263PPay *rtph263ppay;
320 rtph263ppay = GST_RTP_H263P_PAY (payload);
322 rtph263ppay->first_timestamp = GST_BUFFER_TIMESTAMP (buffer);
323 rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer);
325 /* we always encode and flush a full picture */
326 gst_adapter_push (rtph263ppay->adapter, buffer);
327 ret = gst_rtp_h263p_pay_flush (rtph263ppay);
333 gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
335 return gst_element_register (plugin, "rtph263ppay",
336 GST_RANK_NONE, GST_TYPE_RTP_H263P_PAY);