3 * Copyright 2007 Nokia Corporation
4 * Copyright 2007 Collabora Ltd,
5 * @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>
7 * Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
8 * <2007> Edward Hervey <bilboed@bilboed.com>
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Library General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Library General Public License for more details.
20 * You should have received a copy of the GNU Library General Public
21 * License along with this library; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 02111-1307, USA.
32 #include <gst/rtp/gstrtpbuffer.h>
33 #include "gstrtph263depay.h"
35 GST_DEBUG_CATEGORY_STATIC (rtph263depay_debug);
36 #define GST_CAT_DEFAULT (rtph263depay_debug)
38 #define GST_RFC2190A_HEADER_LEN 4
39 #define GST_RFC2190B_HEADER_LEN 8
40 #define GST_RFC2190C_HEADER_LEN 12
42 static GstStaticPadTemplate gst_rtp_h263_depay_src_template =
43 GST_STATIC_PAD_TEMPLATE ("src",
46 GST_STATIC_CAPS ("video/x-h263, "
47 "variant = (string) \"itu\", " "h263version = (string) \"h263\"")
50 static GstStaticPadTemplate gst_rtp_h263_depay_sink_template =
51 GST_STATIC_PAD_TEMPLATE ("sink",
54 GST_STATIC_CAPS ("application/x-rtp, "
55 "media = (string) \"video\", "
56 "payload = (int) " GST_RTP_PAYLOAD_H263_STRING ", "
57 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263\"; "
59 "media = (string) \"video\", "
60 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
61 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263\"")
64 GST_BOILERPLATE (GstRtpH263Depay, gst_rtp_h263_depay, GstBaseRTPDepayload,
65 GST_TYPE_BASE_RTP_DEPAYLOAD);
67 static void gst_rtp_h263_depay_finalize (GObject * object);
69 static GstStateChangeReturn gst_rtp_h263_depay_change_state (GstElement *
70 element, GstStateChange transition);
72 static GstBuffer *gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload,
74 gboolean gst_rtp_h263_depay_setcaps (GstBaseRTPDepayload * filter,
78 gst_rtp_h263_depay_base_init (gpointer klass)
80 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
82 gst_element_class_add_static_pad_template (element_class,
83 &gst_rtp_h263_depay_src_template);
84 gst_element_class_add_static_pad_template (element_class,
85 &gst_rtp_h263_depay_sink_template);
87 gst_element_class_set_details_simple (element_class, "RTP H263 depayloader",
88 "Codec/Depayloader/Network/RTP",
89 "Extracts H263 video from RTP packets (RFC 2190)",
90 "Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
91 "Edward Hervey <bilboed@bilboed.com>");
95 gst_rtp_h263_depay_class_init (GstRtpH263DepayClass * klass)
97 GObjectClass *gobject_class;
98 GstElementClass *gstelement_class;
99 GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
101 gobject_class = (GObjectClass *) klass;
102 gstelement_class = (GstElementClass *) klass;
103 gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
105 gstbasertpdepayload_class->process = gst_rtp_h263_depay_process;
106 gstbasertpdepayload_class->set_caps = gst_rtp_h263_depay_setcaps;
108 gobject_class->finalize = gst_rtp_h263_depay_finalize;
110 gstelement_class->change_state = gst_rtp_h263_depay_change_state;
112 GST_DEBUG_CATEGORY_INIT (rtph263depay_debug, "rtph263depay", 0,
113 "H263 Video RTP Depayloader");
117 gst_rtp_h263_depay_init (GstRtpH263Depay * rtph263depay,
118 GstRtpH263DepayClass * klass)
120 rtph263depay->adapter = gst_adapter_new ();
122 rtph263depay->offset = 0;
123 rtph263depay->leftover = 0;
127 gst_rtp_h263_depay_finalize (GObject * object)
129 GstRtpH263Depay *rtph263depay;
131 rtph263depay = GST_RTP_H263_DEPAY (object);
133 g_object_unref (rtph263depay->adapter);
134 rtph263depay->adapter = NULL;
136 G_OBJECT_CLASS (parent_class)->finalize (object);
140 gst_rtp_h263_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps)
143 GstStructure *structure = gst_caps_get_structure (caps, 0);
146 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
147 clock_rate = 90000; /* default */
148 filter->clock_rate = clock_rate;
150 srccaps = gst_caps_new_simple ("video/x-h263",
151 "variant", G_TYPE_STRING, "itu",
152 "h263version", G_TYPE_STRING, "h263", NULL);
153 gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (filter), srccaps);
154 gst_caps_unref (srccaps);
160 gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
162 GstRtpH263Depay *rtph263depay;
171 rtph263depay = GST_RTP_H263_DEPAY (depayload);
173 /* flush remaining data on discont */
174 if (GST_BUFFER_IS_DISCONT (buf)) {
175 GST_LOG_OBJECT (depayload, "Discont buffer, flushing adapter");
176 gst_adapter_clear (rtph263depay->adapter);
177 rtph263depay->offset = 0;
178 rtph263depay->leftover = 0;
179 rtph263depay->start = FALSE;
182 payload_len = gst_rtp_buffer_get_payload_len (buf);
183 payload = gst_rtp_buffer_get_payload (buf);
185 M = gst_rtp_buffer_get_marker (buf);
187 /* Let's see what mode we are using */
188 F = (payload[0] & 0x80) == 0x80;
189 P = (payload[0] & 0x40) == 0x40;
192 SBIT = (payload[0] & 0x38) >> 3;
193 EBIT = (payload[0] & 0x07);
195 /* Figure out header length and I-flag */
197 /* F == 0 and P == 0 or 1
199 header_len = GST_RFC2190A_HEADER_LEN;
203 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
204 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
205 * |F|P|SBIT |EBIT | SRC |I|U|S|A|R |DBQ| TRB | TR |
206 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
208 I = (payload[1] & 0x10) == 0x10;
213 header_len = GST_RFC2190B_HEADER_LEN;
217 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
218 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
219 * |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
220 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 * |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
222 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 I = (payload[4] & 0x80) == 0x80;
228 header_len = GST_RFC2190C_HEADER_LEN;
232 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
233 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
234 * |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
235 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
236 * |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
237 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
238 * | RR |DBQ| TRB | TR |
239 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
241 I = (payload[4] & 0x80) == 0x80;
245 GST_LOG ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
246 GST_LOG ("SBIT : %d , EBIT : %d", SBIT, EBIT);
247 GST_LOG ("payload_len : %d, header_len : %d , leftover : 0x%x",
248 payload_len, header_len, rtph263depay->leftover);
251 payload += header_len;
252 payload_len -= header_len;
254 if (!rtph263depay->start) {
255 /* do not skip this fragment if it is a Mode A with picture start code */
256 if (!F && payload_len > 4 && (GST_READ_UINT32_BE (payload) >> 10 == 0x20)) {
257 GST_DEBUG ("Mode A with PSC => frame start");
258 rtph263depay->start = TRUE;
259 if (!!(payload[4] & 0x02) != I) {
260 GST_DEBUG ("Wrong Picture Coding Type Flag in rtp header");
263 rtph263depay->psc_I = I;
265 GST_DEBUG ("no frame start yet, skipping payload");
270 /* only trust I info from Mode A starting packet
271 * from buggy payloaders or hw */
272 I = rtph263depay->psc_I;
275 /* take the leftover and merge it at the beginning, FIXME make the buffer
277 GST_LOG ("payload[0] : 0x%x", payload[0]);
278 payload[0] &= 0xFF >> SBIT;
279 GST_LOG ("payload[0] : 0x%x", payload[0]);
280 payload[0] |= rtph263depay->leftover;
281 GST_LOG ("payload[0] : 0x%x", payload[0]);
282 rtph263depay->leftover = 0;
283 rtph263depay->offset = 0;
289 /* Take the entire buffer */
290 tmp = gst_rtp_buffer_get_payload_subbuffer (buf, header_len, payload_len);
291 gst_adapter_push (rtph263depay->adapter, tmp);
295 /* Take the entire buffer except for the last byte */
296 tmp = gst_rtp_buffer_get_payload_subbuffer (buf, header_len,
298 gst_adapter_push (rtph263depay->adapter, tmp);
300 /* Put the last byte into the leftover */
301 GST_DEBUG ("payload[payload_len - 1] : 0x%x", payload[payload_len - 1]);
302 GST_DEBUG ("mask : 0x%x", 0xFF << EBIT);
303 rtph263depay->leftover = (payload[payload_len - 1] >> EBIT) << EBIT;
304 rtph263depay->offset = 1;
305 GST_DEBUG ("leftover : 0x%x", rtph263depay->leftover);
310 if (rtph263depay->start) {
311 /* frame is completed */
315 if (rtph263depay->offset) {
316 /* push in the leftover */
317 GstBuffer *buf = gst_buffer_new_and_alloc (1);
319 GST_DEBUG ("Pushing leftover in adapter");
320 GST_BUFFER_DATA (buf)[0] = rtph263depay->leftover;
321 gst_adapter_push (rtph263depay->adapter, buf);
324 avail = gst_adapter_available (rtph263depay->adapter);
325 outbuf = gst_adapter_take_buffer (rtph263depay->adapter, avail);
328 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
330 GST_DEBUG ("Pushing out a buffer of %d bytes", avail);
332 timestamp = gst_rtp_buffer_get_timestamp (buf);
333 gst_base_rtp_depayload_push_ts (depayload, timestamp, outbuf);
334 rtph263depay->offset = 0;
335 rtph263depay->leftover = 0;
336 rtph263depay->start = FALSE;
338 rtph263depay->start = TRUE;
345 static GstStateChangeReturn
346 gst_rtp_h263_depay_change_state (GstElement * element,
347 GstStateChange transition)
349 GstRtpH263Depay *rtph263depay;
350 GstStateChangeReturn ret;
352 rtph263depay = GST_RTP_H263_DEPAY (element);
354 switch (transition) {
355 case GST_STATE_CHANGE_NULL_TO_READY:
357 case GST_STATE_CHANGE_READY_TO_PAUSED:
358 gst_adapter_clear (rtph263depay->adapter);
359 rtph263depay->start = TRUE;
365 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
367 switch (transition) {
368 case GST_STATE_CHANGE_READY_TO_NULL:
377 gst_rtp_h263_depay_plugin_init (GstPlugin * plugin)
379 return gst_element_register (plugin, "rtph263depay",
380 GST_RANK_SECONDARY, GST_TYPE_RTP_H263_DEPAY);