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 /* elementfactory information */
61 static const GstElementDetails gst_rtp_h263ppay_details =
62 GST_ELEMENT_DETAILS ("RTP H263 payloader",
63 "Codec/Payloader/Network",
64 "Payload-encodes H263/+/++ video in RTP packets (RFC 4629)",
65 "Wim Taymans <wim.taymans@gmail.com>");
67 static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template =
68 GST_STATIC_PAD_TEMPLATE ("sink",
71 GST_STATIC_CAPS ("video/x-h263, " "variant = (string) \"itu\" ")
74 static GstStaticPadTemplate gst_rtp_h263p_pay_src_template =
75 GST_STATIC_PAD_TEMPLATE ("src",
78 GST_STATIC_CAPS ("application/x-rtp, "
79 "media = (string) \"video\", "
80 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
81 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; "
83 "media = (string) \"video\", "
84 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
85 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"")
88 static void gst_rtp_h263p_pay_finalize (GObject * object);
90 static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
91 const GValue * value, GParamSpec * pspec);
92 static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
93 GValue * value, GParamSpec * pspec);
95 static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload,
97 static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload *
98 payload, GstBuffer * buffer);
100 GST_BOILERPLATE (GstRtpH263PPay, gst_rtp_h263p_pay, GstBaseRTPPayload,
101 GST_TYPE_BASE_RTP_PAYLOAD);
104 gst_rtp_h263p_pay_base_init (gpointer klass)
106 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
108 gst_element_class_add_pad_template (element_class,
109 gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template));
110 gst_element_class_add_pad_template (element_class,
111 gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template));
113 gst_element_class_set_details (element_class, &gst_rtp_h263ppay_details);
117 gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass)
119 GObjectClass *gobject_class;
120 GstBaseRTPPayloadClass *gstbasertppayload_class;
122 gobject_class = (GObjectClass *) klass;
123 gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass;
125 gobject_class->finalize = gst_rtp_h263p_pay_finalize;
126 gobject_class->set_property = gst_rtp_h263p_pay_set_property;
127 gobject_class->get_property = gst_rtp_h263p_pay_get_property;
129 gstbasertppayload_class->set_caps = gst_rtp_h263p_pay_setcaps;
130 gstbasertppayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer;
132 g_object_class_install_property (G_OBJECT_CLASS (klass),
133 PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode",
134 "Fragmentation Mode",
135 "Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE,
136 DEFAULT_FRAGMENTATION_MODE, G_PARAM_READWRITE));
138 GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay",
139 0, "rtph263ppay (RFC 4629)");
143 gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay,
144 GstRtpH263PPayClass * klass)
146 rtph263ppay->adapter = gst_adapter_new ();
148 rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE;
152 gst_rtp_h263p_pay_finalize (GObject * object)
154 GstRtpH263PPay *rtph263ppay;
156 rtph263ppay = GST_RTP_H263P_PAY (object);
158 g_object_unref (rtph263ppay->adapter);
159 rtph263ppay->adapter = NULL;
161 G_OBJECT_CLASS (parent_class)->finalize (object);
165 gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
169 gst_basertppayload_set_options (payload, "video", TRUE, "H263-1998", 90000);
170 res = gst_basertppayload_set_outcaps (payload, NULL);
176 gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id,
177 const GValue * value, GParamSpec * pspec)
179 GstRtpH263PPay *rtph263ppay;
181 rtph263ppay = GST_RTP_H263P_PAY (object);
184 case PROP_FRAGMENTATION_MODE:
185 rtph263ppay->fragmentation_mode = g_value_get_enum (value);
188 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
194 gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id,
195 GValue * value, GParamSpec * pspec)
197 GstRtpH263PPay *rtph263ppay;
199 rtph263ppay = GST_RTP_H263P_PAY (object);
202 case PROP_FRAGMENTATION_MODE:
203 g_value_set_enum (value, rtph263ppay->fragmentation_mode);
206 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
212 gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
219 avail = gst_adapter_available (rtph263ppay->adapter);
224 /* This algorithm assumes the H263/+/++ encoder sends complete frames in each
226 /* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
227 * This algorithm implements the Follow-on packets method for packetization.
228 * This assumes low packet loss network.
229 * With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
230 * This algorithm separates large frames at synchronisation points (Segments)
231 * (See RFC 4629 section 6). It would be interesting to have a property such as network
232 * quality to select between both packetization methods */
233 /* TODO Add VRC supprt (See RFC 4629 section 5.2) */
242 gboolean found_gob = FALSE;
244 if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
245 /* start after 1st gop possible */
246 guint parsed_len = 3;
247 const guint8 *parse_data = NULL;
249 parse_data = gst_adapter_peek (rtph263ppay->adapter, avail);
251 /* Check if we have a gob or eos , eossbs */
252 /* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
253 if (avail >= 3 && *parse_data == 0 && *(parse_data + 1) == 0
254 && *(parse_data + 2) >= 0x80) {
255 GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
258 /* Find next and cut the packet accordingly */
259 /* TODO we should get as many gobs as possible until MTU is reached, this
260 * code seems to just get one GOB per packet */
261 while (parsed_len + 2 < avail) {
262 if (parse_data[parsed_len] == 0 && parse_data[parsed_len + 1] == 0
263 && parse_data[parsed_len + 2] >= 0x80) {
264 next_gop = parsed_len;
265 GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d",
273 /* for picture start frames (non-fragmented), we need to remove the first
274 * two 0x00 bytes and set P=1 */
275 header_len = (fragmented && !found_gob) ? 2 : 0;
277 towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
278 (GST_BASE_RTP_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
281 towrite = MIN (next_gop, towrite);
283 payload_len = header_len + towrite;
285 outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0);
286 /* last fragment gets the marker bit set */
287 gst_rtp_buffer_set_marker (outbuf, avail > towrite ? 0 : 1);
289 payload = gst_rtp_buffer_get_payload (outbuf);
291 data = (guint8 *) gst_adapter_peek (rtph263ppay->adapter, towrite);
292 memcpy (&payload[header_len], data, towrite);
295 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
296 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
297 * | RR |P|V| PLEN |PEBIT|
298 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
300 /* if fragmented or gop header , write p bit =1 */
301 payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
304 GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_timestamp;
305 GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
307 gst_adapter_flush (rtph263ppay->adapter, towrite);
309 ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263ppay), outbuf);
319 gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload,
322 GstRtpH263PPay *rtph263ppay;
325 rtph263ppay = GST_RTP_H263P_PAY (payload);
327 rtph263ppay->first_timestamp = GST_BUFFER_TIMESTAMP (buffer);
328 rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer);
330 /* we always encode and flush a full picture */
331 gst_adapter_push (rtph263ppay->adapter, buffer);
332 ret = gst_rtp_h263p_pay_flush (rtph263ppay);
338 gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin)
340 return gst_element_register (plugin, "rtph263ppay",
341 GST_RANK_NONE, GST_TYPE_RTP_H263P_PAY);