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., 51 Franklin St, Fifth Floor,
23 * Boston, MA 02110-1301, 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; "
59 "media = (string) \"video\", "
60 "clock-rate = (int) 90000, " "encoding-name = (string) \"H263\"")
63 #define gst_rtp_h263_depay_parent_class parent_class
64 G_DEFINE_TYPE (GstRtpH263Depay, gst_rtp_h263_depay,
65 GST_TYPE_RTP_BASE_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 (GstRTPBaseDepayload * depayload,
74 gboolean gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter,
78 gst_rtp_h263_depay_class_init (GstRtpH263DepayClass * klass)
80 GObjectClass *gobject_class;
81 GstElementClass *gstelement_class;
82 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
84 GST_DEBUG_CATEGORY_INIT (rtph263depay_debug, "rtph263depay", 0,
85 "H263 Video RTP Depayloader");
87 gobject_class = (GObjectClass *) klass;
88 gstelement_class = (GstElementClass *) klass;
89 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
91 gobject_class->finalize = gst_rtp_h263_depay_finalize;
93 gstelement_class->change_state = gst_rtp_h263_depay_change_state;
95 gst_element_class_add_pad_template (gstelement_class,
96 gst_static_pad_template_get (&gst_rtp_h263_depay_src_template));
97 gst_element_class_add_pad_template (gstelement_class,
98 gst_static_pad_template_get (&gst_rtp_h263_depay_sink_template));
100 gst_element_class_set_static_metadata (gstelement_class,
101 "RTP H263 depayloader", "Codec/Depayloader/Network/RTP",
102 "Extracts H263 video from RTP packets (RFC 2190)",
103 "Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
104 "Edward Hervey <bilboed@bilboed.com>");
106 gstrtpbasedepayload_class->process = gst_rtp_h263_depay_process;
107 gstrtpbasedepayload_class->set_caps = gst_rtp_h263_depay_setcaps;
111 gst_rtp_h263_depay_init (GstRtpH263Depay * rtph263depay)
113 rtph263depay->adapter = gst_adapter_new ();
115 rtph263depay->offset = 0;
116 rtph263depay->leftover = 0;
120 gst_rtp_h263_depay_finalize (GObject * object)
122 GstRtpH263Depay *rtph263depay;
124 rtph263depay = GST_RTP_H263_DEPAY (object);
126 g_object_unref (rtph263depay->adapter);
127 rtph263depay->adapter = NULL;
129 G_OBJECT_CLASS (parent_class)->finalize (object);
133 gst_rtp_h263_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps)
136 GstStructure *structure = gst_caps_get_structure (caps, 0);
139 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
140 clock_rate = 90000; /* default */
141 filter->clock_rate = clock_rate;
143 srccaps = gst_caps_new_simple ("video/x-h263",
144 "variant", G_TYPE_STRING, "itu",
145 "h263version", G_TYPE_STRING, "h263", NULL);
146 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (filter), srccaps);
147 gst_caps_unref (srccaps);
153 gst_rtp_h263_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
155 GstRtpH263Depay *rtph263depay;
163 GstRTPBuffer rtp = { NULL };
165 rtph263depay = GST_RTP_H263_DEPAY (depayload);
167 /* flush remaining data on discont */
168 if (GST_BUFFER_IS_DISCONT (buf)) {
169 GST_LOG_OBJECT (depayload, "Discont buffer, flushing adapter");
170 gst_adapter_clear (rtph263depay->adapter);
171 rtph263depay->offset = 0;
172 rtph263depay->leftover = 0;
173 rtph263depay->start = FALSE;
176 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
178 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
179 payload = gst_rtp_buffer_get_payload (&rtp);
181 M = gst_rtp_buffer_get_marker (&rtp);
183 /* Let's see what mode we are using */
184 F = (payload[0] & 0x80) == 0x80;
185 P = (payload[0] & 0x40) == 0x40;
188 SBIT = (payload[0] & 0x38) >> 3;
189 EBIT = (payload[0] & 0x07);
191 /* Figure out header length and I-flag */
193 /* F == 0 and P == 0 or 1
195 header_len = GST_RFC2190A_HEADER_LEN;
199 * 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
200 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
201 * |F|P|SBIT |EBIT | SRC |I|U|S|A|R |DBQ| TRB | TR |
202 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
204 I = (payload[1] & 0x10) == 0x10;
209 header_len = GST_RFC2190B_HEADER_LEN;
213 * 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
214 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
215 * |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
216 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
217 * |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
218 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 I = (payload[4] & 0x80) == 0x80;
224 header_len = GST_RFC2190C_HEADER_LEN;
228 * 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
229 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
230 * |F|P|SBIT |EBIT | SRC | QUANT | GOBN | MBA |R |
231 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 * |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
233 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
234 * | RR |DBQ| TRB | TR |
235 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
237 I = (payload[4] & 0x80) == 0x80;
241 GST_LOG ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
242 GST_LOG ("SBIT : %d , EBIT : %d", SBIT, EBIT);
243 GST_LOG ("payload_len : %d, header_len : %d , leftover : 0x%x",
244 payload_len, header_len, rtph263depay->leftover);
247 payload += header_len;
248 payload_len -= header_len;
250 if (!rtph263depay->start) {
251 /* do not skip this fragment if it is a Mode A with picture start code */
252 if (!F && payload_len > 4 && (GST_READ_UINT32_BE (payload) >> 10 == 0x20)) {
253 GST_DEBUG ("Mode A with PSC => frame start");
254 rtph263depay->start = TRUE;
255 if (! !(payload[4] & 0x02) != I) {
256 GST_DEBUG ("Wrong Picture Coding Type Flag in rtp header");
259 rtph263depay->psc_I = I;
261 GST_DEBUG ("no frame start yet, skipping payload");
266 /* only trust I info from Mode A starting packet
267 * from buggy payloaders or hw */
268 I = rtph263depay->psc_I;
271 /* take the leftover and merge it at the beginning, FIXME make the buffer
273 GST_LOG ("payload[0] : 0x%x", payload[0]);
274 payload[0] &= 0xFF >> SBIT;
275 GST_LOG ("payload[0] : 0x%x", payload[0]);
276 payload[0] |= rtph263depay->leftover;
277 GST_LOG ("payload[0] : 0x%x", payload[0]);
278 rtph263depay->leftover = 0;
279 rtph263depay->offset = 0;
285 /* Take the entire buffer */
286 tmp = gst_rtp_buffer_get_payload_subbuffer (&rtp, header_len, payload_len);
287 gst_adapter_push (rtph263depay->adapter, tmp);
291 /* Take the entire buffer except for the last byte */
292 tmp = gst_rtp_buffer_get_payload_subbuffer (&rtp, header_len,
294 gst_adapter_push (rtph263depay->adapter, tmp);
296 /* Put the last byte into the leftover */
297 GST_DEBUG ("payload[payload_len - 1] : 0x%x", payload[payload_len - 1]);
298 GST_DEBUG ("mask : 0x%x", 0xFF << EBIT);
299 rtph263depay->leftover = (payload[payload_len - 1] >> EBIT) << EBIT;
300 rtph263depay->offset = 1;
301 GST_DEBUG ("leftover : 0x%x", rtph263depay->leftover);
306 if (rtph263depay->start) {
307 /* frame is completed */
310 if (rtph263depay->offset) {
311 /* push in the leftover */
312 GstBuffer *buf = gst_buffer_new_and_alloc (1);
314 GST_DEBUG ("Pushing leftover in adapter");
315 gst_buffer_fill (buf, 0, &rtph263depay->leftover, 1);
316 gst_adapter_push (rtph263depay->adapter, buf);
319 avail = gst_adapter_available (rtph263depay->adapter);
320 outbuf = gst_adapter_take_buffer (rtph263depay->adapter, avail);
323 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
325 GST_DEBUG ("Pushing out a buffer of %d bytes", avail);
327 gst_rtp_base_depayload_push (depayload, outbuf);
328 rtph263depay->offset = 0;
329 rtph263depay->leftover = 0;
330 rtph263depay->start = FALSE;
332 rtph263depay->start = TRUE;
335 gst_rtp_buffer_unmap (&rtp);
340 static GstStateChangeReturn
341 gst_rtp_h263_depay_change_state (GstElement * element,
342 GstStateChange transition)
344 GstRtpH263Depay *rtph263depay;
345 GstStateChangeReturn ret;
347 rtph263depay = GST_RTP_H263_DEPAY (element);
349 switch (transition) {
350 case GST_STATE_CHANGE_NULL_TO_READY:
352 case GST_STATE_CHANGE_READY_TO_PAUSED:
353 gst_adapter_clear (rtph263depay->adapter);
354 rtph263depay->start = TRUE;
360 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
362 switch (transition) {
363 case GST_STATE_CHANGE_READY_TO_NULL:
372 gst_rtp_h263_depay_plugin_init (GstPlugin * plugin)
374 return gst_element_register (plugin, "rtph263depay",
375 GST_RANK_SECONDARY, GST_TYPE_RTP_H263_DEPAY);