1 /* GStreamer
2 * Copyright (C) <2006> Wim Taymans <wim@fluendo.com>
3 *
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.
8 *
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.
13 *
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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 /*
21 * based on http://developer.apple.com/quicktime/icefloe/dispatch026.html
22 */
23 #ifdef HAVE_CONFIG_H
24 # include "config.h"
25 #endif
26
27 #include <gst/rtp/gstrtpbuffer.h>
28
29 #include <string.h>
30 #include "gstrtpxqtdepay.h"
31
32 #define MAKE_TLV(a,b) (((a)<<8)|(b))
33
34 #define TLV_sd MAKE_TLV ('s','d')
35 #define TLV_qt MAKE_TLV ('q','t')
36 #define TLV_ti MAKE_TLV ('t','i')
37 #define TLV_ly MAKE_TLV ('l','y')
38 #define TLV_vo MAKE_TLV ('v','o')
39 #define TLV_mx MAKE_TLV ('m','x')
40 #define TLV_tr MAKE_TLV ('t','r')
41 #define TLV_tw MAKE_TLV ('t','w')
42 #define TLV_th MAKE_TLV ('t','h')
43 #define TLV_la MAKE_TLV ('l','a')
44 #define TLV_rt MAKE_TLV ('r','t')
45 #define TLV_gm MAKE_TLV ('g','m')
46 #define TLV_oc MAKE_TLV ('o','c')
47 #define TLV_cr MAKE_TLV ('c','r')
48 #define TLV_du MAKE_TLV ('d','u')
49 #define TLV_po MAKE_TLV ('p','o')
50
51 #define QT_UINT32(a) (GST_READ_UINT32_BE(a))
52 #define QT_UINT24(a) (GST_READ_UINT32_BE(a) >> 8)
53 #define QT_UINT16(a) (GST_READ_UINT16_BE(a))
54 #define QT_UINT8(a) (GST_READ_UINT8(a))
55 #define QT_FP32(a) ((GST_READ_UINT32_BE(a))/65536.0)
56 #define QT_FP16(a) ((GST_READ_UINT16_BE(a))/256.0)
57 #define QT_FOURCC(a) (GST_READ_UINT32_LE(a))
58 #define QT_UINT64(a) ((((guint64)QT_UINT32(a))<<32)|QT_UINT32(((guint8 *)a)+4))
59
60 #define FOURCC_avc1 GST_MAKE_FOURCC('a','v','c','1')
61 #define FOURCC_avc3 GST_MAKE_FOURCC('a','v','c','3')
62 #define FOURCC_avcC GST_MAKE_FOURCC('a','v','c','C')
63
64 GST_DEBUG_CATEGORY_STATIC (rtpxqtdepay_debug);
65 #define GST_CAT_DEFAULT (rtpxqtdepay_debug)
66
67 /* RtpXQTDepay signals and args */
68 enum
69 {
70 /* FILL ME */
71 LAST_SIGNAL
72 };
73
74 enum
75 {
76 PROP_0,
77 };
78
79 static GstStaticPadTemplate gst_rtp_xqt_depay_src_template =
80 GST_STATIC_PAD_TEMPLATE ("src",
81 GST_PAD_SRC,
82 GST_PAD_ALWAYS,
83 GST_STATIC_CAPS_ANY);
84
85 static GstStaticPadTemplate gst_rtp_xqt_depay_sink_template =
86 GST_STATIC_PAD_TEMPLATE ("sink",
87 GST_PAD_SINK,
88 GST_PAD_ALWAYS,
89 GST_STATIC_CAPS ("application/x-rtp, "
90 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
91 "media = (string) { \"audio\", \"video\" }, clock-rate = (int) [1, MAX], "
92 "encoding-name = (string) { \"X-QT\", \"X-QUICKTIME\" }")
93 );
94
95 #define gst_rtp_xqt_depay_parent_class parent_class
96 G_DEFINE_TYPE (GstRtpXQTDepay, gst_rtp_xqt_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
97
98 static void gst_rtp_xqt_depay_finalize (GObject * object);
99
100 static gboolean gst_rtp_xqt_depay_setcaps (GstRTPBaseDepayload * depayload,
101 GstCaps * caps);
102 static GstBuffer *gst_rtp_xqt_depay_process (GstRTPBaseDepayload * depayload,
103 GstBuffer * buf);
104
105 static GstStateChangeReturn gst_rtp_xqt_depay_change_state (GstElement *
106 element, GstStateChange transition);
107
108
109 static void
gst_rtp_xqt_depay_class_init(GstRtpXQTDepayClass * klass)110 gst_rtp_xqt_depay_class_init (GstRtpXQTDepayClass * klass)
111 {
112 GObjectClass *gobject_class;
113 GstElementClass *gstelement_class;
114 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
115
116 gobject_class = (GObjectClass *) klass;
117 gstelement_class = (GstElementClass *) klass;
118 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
119
120 parent_class = g_type_class_peek_parent (klass);
121
122 gobject_class->finalize = gst_rtp_xqt_depay_finalize;
123
124 gstelement_class->change_state = gst_rtp_xqt_depay_change_state;
125
126 gstrtpbasedepayload_class->set_caps = gst_rtp_xqt_depay_setcaps;
127 gstrtpbasedepayload_class->process = gst_rtp_xqt_depay_process;
128
129 GST_DEBUG_CATEGORY_INIT (rtpxqtdepay_debug, "rtpxqtdepay", 0,
130 "QT Media RTP Depayloader");
131
132 gst_element_class_add_static_pad_template (gstelement_class,
133 &gst_rtp_xqt_depay_src_template);
134 gst_element_class_add_static_pad_template (gstelement_class,
135 &gst_rtp_xqt_depay_sink_template);
136
137 gst_element_class_set_static_metadata (gstelement_class,
138 "RTP packet depayloader", "Codec/Depayloader/Network",
139 "Extracts Quicktime audio/video from RTP packets",
140 "Wim Taymans <wim@fluendo.com>");
141 }
142
143 static void
gst_rtp_xqt_depay_init(GstRtpXQTDepay * rtpxqtdepay)144 gst_rtp_xqt_depay_init (GstRtpXQTDepay * rtpxqtdepay)
145 {
146 rtpxqtdepay->adapter = gst_adapter_new ();
147 }
148
149 static void
gst_rtp_xqt_depay_finalize(GObject * object)150 gst_rtp_xqt_depay_finalize (GObject * object)
151 {
152 GstRtpXQTDepay *rtpxqtdepay;
153
154 rtpxqtdepay = GST_RTP_XQT_DEPAY (object);
155
156 g_object_unref (rtpxqtdepay->adapter);
157 rtpxqtdepay->adapter = NULL;
158
159 G_OBJECT_CLASS (parent_class)->finalize (object);
160 }
161
162 static gboolean
gst_rtp_quicktime_parse_sd(GstRtpXQTDepay * rtpxqtdepay,guint8 * data,guint data_len)163 gst_rtp_quicktime_parse_sd (GstRtpXQTDepay * rtpxqtdepay, guint8 * data,
164 guint data_len)
165 {
166 gint len;
167 guint32 fourcc;
168
169 if (data_len < 8)
170 goto too_short;
171
172 len = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
173 if (len > data_len)
174 goto too_short;
175
176 fourcc = QT_FOURCC (data + 4);
177
178 GST_DEBUG_OBJECT (rtpxqtdepay, "parsing %" GST_FOURCC_FORMAT,
179 GST_FOURCC_ARGS (fourcc));
180
181 switch (fourcc) {
182 case FOURCC_avc1:
183 case FOURCC_avc3:
184 {
185 guint32 chlen;
186
187 if (len < 0x56)
188 goto too_short;
189 len -= 0x56;
190 data += 0x56;
191
192 /* find avcC */
193 while (len >= 8) {
194 chlen = QT_UINT32 (data);
195 fourcc = QT_FOURCC (data + 4);
196 if (fourcc == FOURCC_avcC) {
197 GstBuffer *buf;
198 gint size;
199 GstCaps *caps;
200
201 GST_DEBUG_OBJECT (rtpxqtdepay, "found avcC codec_data in sd, %u",
202 chlen);
203
204 /* parse, if found */
205 if (chlen < len)
206 size = chlen - 8;
207 else
208 size = len - 8;
209
210 buf = gst_buffer_new_and_alloc (size);
211 gst_buffer_fill (buf, 0, data + 8, size);
212 caps = gst_caps_new_simple ("video/x-h264",
213 "codec_data", GST_TYPE_BUFFER, buf, NULL);
214 gst_buffer_unref (buf);
215 gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD (rtpxqtdepay)->srcpad, caps);
216 gst_caps_unref (caps);
217 break;
218 }
219 len -= chlen;
220 data += chlen;
221 }
222 break;
223 }
224 default:
225 break;
226 }
227 return TRUE;
228
229 /* ERRORS */
230 too_short:
231 {
232 return FALSE;
233 }
234 }
235
236 static gboolean
gst_rtp_xqt_depay_setcaps(GstRTPBaseDepayload * depayload,GstCaps * caps)237 gst_rtp_xqt_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
238 {
239 GstStructure *structure;
240 gint clock_rate = 90000; /* default */
241
242 structure = gst_caps_get_structure (caps, 0);
243
244 gst_structure_get_int (structure, "clock-rate", &clock_rate);
245 depayload->clock_rate = clock_rate;
246
247 return TRUE;
248 }
249
250 static GstBuffer *
gst_rtp_xqt_depay_process(GstRTPBaseDepayload * depayload,GstBuffer * buf)251 gst_rtp_xqt_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
252 {
253 GstRtpXQTDepay *rtpxqtdepay;
254 GstBuffer *outbuf = NULL;
255 gboolean m;
256 GstRTPBuffer rtp = { NULL };
257
258 rtpxqtdepay = GST_RTP_XQT_DEPAY (depayload);
259
260 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
261
262 if (GST_BUFFER_IS_DISCONT (buf)) {
263 /* discont, clear adapter and try to find a new packet start */
264 gst_adapter_clear (rtpxqtdepay->adapter);
265 rtpxqtdepay->need_resync = TRUE;
266 GST_DEBUG_OBJECT (rtpxqtdepay, "we need resync");
267 }
268
269 m = gst_rtp_buffer_get_marker (&rtp);
270 GST_LOG_OBJECT (rtpxqtdepay, "marker: %d", m);
271
272 {
273 gint payload_len;
274 guint avail;
275 guint8 *payload;
276 guint8 ver, pck;
277 gboolean s, q, l, d;
278
279 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
280 payload = gst_rtp_buffer_get_payload (&rtp);
281
282 /* 1 2 3
283 * 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
284 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
285 * | VER |PCK|S|Q|L| RES |D| QuickTime Payload ID |
286 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
287 */
288 if (payload_len <= 4)
289 goto wrong_length;
290
291 ver = (payload[0] & 0xf0) >> 4;
292 if (ver > 1)
293 goto wrong_version;
294
295 pck = (payload[0] & 0x0c) >> 2;
296 if (pck == 0)
297 goto pck_reserved;
298
299 s = (payload[0] & 0x02) != 0; /* contains sync sample */
300 q = (payload[0] & 0x01) != 0; /* has payload description */
301 l = (payload[1] & 0x80) != 0; /* has packet specific information description */
302 d = (payload[2] & 0x80) != 0; /* don't cache info for payload id */
303 /* id used for caching info */
304 rtpxqtdepay->current_id = ((payload[2] & 0x7f) << 8) | payload[3];
305
306 GST_LOG_OBJECT (rtpxqtdepay,
307 "VER: %d, PCK: %d, S: %d, Q: %d, L: %d, D: %d, ID: %d", ver, pck, s, q,
308 l, d, rtpxqtdepay->current_id);
309
310 if (rtpxqtdepay->need_resync) {
311 /* we need to find the boundary of a new packet after a DISCONT */
312 if (pck != 3 || q) {
313 /* non-fragmented packet or payload description present, packet starts
314 * here. */
315 rtpxqtdepay->need_resync = FALSE;
316 } else {
317 /* fragmented packet without description */
318 if (m) {
319 /* marker bit set, next packet is start of new one */
320 rtpxqtdepay->need_resync = FALSE;
321 }
322 goto need_resync;
323 }
324 }
325
326 payload += 4;
327 payload_len -= 4;
328
329 if (q) {
330 gboolean k, f, a, z;
331 guint pdlen, pdpadded;
332 gint padding;
333 /* media_type only used for printing */
334 guint32 G_GNUC_UNUSED media_type;
335 guint32 timescale;
336
337 /* 1 2 3
338 * 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
339 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
340 * |K|F|A|Z| RES | QuickTime Payload Desc Length |
341 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
342 * . QuickTime Payload Desc Data ... .
343 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
344 */
345 if (payload_len <= 4)
346 goto wrong_length;
347
348 k = (payload[0] & 0x80) != 0; /* keyframe */
349 f = (payload[0] & 0x40) != 0; /* sparse */
350 a = (payload[0] & 0x20) != 0; /* start of payload */
351 z = (payload[0] & 0x10) != 0; /* end of payload */
352 pdlen = (payload[2] << 8) | payload[3];
353
354 if (pdlen < 12)
355 goto wrong_length;
356
357 /* calc padding */
358 pdpadded = pdlen + 3;
359 pdpadded -= pdpadded % 4;
360 if (payload_len < pdpadded)
361 goto wrong_length;
362
363 padding = pdpadded - pdlen;
364 GST_LOG_OBJECT (rtpxqtdepay,
365 "K: %d, F: %d, A: %d, Z: %d, len: %d, padding %d", k, f, a, z, pdlen,
366 padding);
367
368 payload += 4;
369 payload_len -= 4;
370 /* 1 2 3
371 * 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
372 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
373 * | QuickTime Media Type |
374 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
375 * | Timescale |
376 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
377 * . QuickTime TLVs ... .
378 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
379 */
380 media_type =
381 (payload[0] << 24) | (payload[1] << 16) | (payload[2] << 8) |
382 payload[3];
383 timescale =
384 (payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) |
385 payload[7];
386
387 GST_LOG_OBJECT (rtpxqtdepay, "media_type: %c%c%c%c, timescale %u",
388 payload[0], payload[1], payload[2], payload[3], timescale);
389
390 payload += 8;
391 payload_len -= 8;
392 pdlen -= 12;
393
394 /* parse TLV (type-length-value triplets */
395 while (pdlen > 3) {
396 guint16 tlv_len, tlv_type;
397
398 /* 1 2 3
399 * 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
400 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
401 * | QuickTime TLV Length | QuickTime TLV Type |
402 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
403 * . QuickTime TLV Value ... .
404 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
405 */
406 tlv_len = (payload[0] << 8) | payload[1];
407 tlv_type = (payload[2] << 8) | payload[3];
408 pdlen -= 4;
409 if (tlv_len > pdlen)
410 goto wrong_length;
411
412 GST_LOG_OBJECT (rtpxqtdepay, "TLV '%c%c', len %d", payload[2],
413 payload[3], tlv_len);
414
415 payload += 4;
416 payload_len -= 4;
417
418 switch (tlv_type) {
419 case TLV_sd:
420 /* Session description */
421 if (!gst_rtp_quicktime_parse_sd (rtpxqtdepay, payload, tlv_len))
422 goto unknown_format;
423 rtpxqtdepay->have_sd = TRUE;
424 break;
425 case TLV_qt:
426 case TLV_ti:
427 case TLV_ly:
428 case TLV_vo:
429 case TLV_mx:
430 case TLV_tr:
431 case TLV_tw:
432 case TLV_th:
433 case TLV_la:
434 case TLV_rt:
435 case TLV_gm:
436 case TLV_oc:
437 case TLV_cr:
438 case TLV_du:
439 case TLV_po:
440 default:
441 break;
442 }
443
444 pdlen -= tlv_len;
445 payload += tlv_len;
446 payload_len -= tlv_len;
447 }
448 payload += padding;
449 payload_len -= padding;
450 }
451
452 if (l) {
453 guint ssilen, ssipadded;
454 gint padding;
455
456 /* 1 2 3
457 * 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
458 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
459 * | RES | Sample-Specific Info Length |
460 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
461 * . QuickTime TLVs ...
462 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
463 */
464 if (payload_len <= 4)
465 goto wrong_length;
466
467 ssilen = (payload[2] << 8) | payload[3];
468 if (ssilen < 4)
469 goto wrong_length;
470
471 /* calc padding */
472 ssipadded = ssilen + 3;
473 ssipadded -= ssipadded % 4;
474 if (payload_len < ssipadded)
475 goto wrong_length;
476
477 padding = ssipadded - ssilen;
478 GST_LOG_OBJECT (rtpxqtdepay, "len: %d, padding %d", ssilen, padding);
479
480 payload += 4;
481 payload_len -= 4;
482 ssilen -= 4;
483
484 /* parse TLV (type-length-value triplets */
485 while (ssilen > 3) {
486 guint16 tlv_len, tlv_type;
487
488 /* 1 2 3
489 * 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
490 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
491 * | QuickTime TLV Length | QuickTime TLV Type |
492 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
493 * . QuickTime TLV Value ... .
494 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
495 */
496 tlv_len = (payload[0] << 8) | payload[1];
497 tlv_type = (payload[2] << 8) | payload[3];
498 ssilen -= 4;
499 if (tlv_len > ssilen)
500 goto wrong_length;
501
502 GST_LOG_OBJECT (rtpxqtdepay, "TLV '%c%c', len %d", payload[2],
503 payload[3], tlv_len);
504
505 payload += 4;
506 payload_len -= 4;
507
508 switch (tlv_type) {
509 case TLV_sd:
510 case TLV_qt:
511 case TLV_ti:
512 case TLV_ly:
513 case TLV_vo:
514 case TLV_mx:
515 case TLV_tr:
516 case TLV_tw:
517 case TLV_th:
518 case TLV_la:
519 case TLV_rt:
520 case TLV_gm:
521 case TLV_oc:
522 case TLV_cr:
523 case TLV_du:
524 case TLV_po:
525 default:
526 break;
527 }
528
529 ssilen -= tlv_len;
530 payload += tlv_len;
531 payload_len -= tlv_len;
532 }
533 payload += padding;
534 payload_len -= padding;
535 }
536
537 rtpxqtdepay->previous_id = rtpxqtdepay->current_id;
538
539 switch (pck) {
540 case 1:
541 {
542 /* multiple samples per packet. */
543 outbuf = gst_buffer_new_and_alloc (payload_len);
544 gst_buffer_fill (outbuf, 0, payload, payload_len);
545
546 goto done;
547 }
548 case 2:
549 {
550 guint slen;
551
552 /* multiple samples per packet.
553 * 1 2 3
554 * 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
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * |S| Reserved | Sample Length |
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558 * | Sample Timestamp |
559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
560 * . Sample Data ... .
561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
562 * |S| Reserved | Sample Length |
563 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
564 * | Sample Timestamp |
565 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
566 * . Sample Data ... .
567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
568 * . ...... .
569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
570 */
571 while (payload_len > 8) {
572 s = (payload[0] & 0x80) != 0; /* contains sync sample */
573 slen = (payload[2] << 8) | payload[3];
574 /* timestamp =
575 * (payload[4] << 24) | (payload[5] << 16) | (payload[6] << 8) |
576 * payload[7];
577 */
578
579 payload += 8;
580 payload_len -= 8;
581
582 if (slen > payload_len)
583 slen = payload_len;
584
585 outbuf = gst_buffer_new_and_alloc (slen);
586 gst_buffer_fill (outbuf, 0, payload, slen);
587 if (!s)
588 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
589
590 gst_rtp_base_depayload_push (depayload, outbuf);
591
592 /* aligned on 32 bit boundary */
593 slen = GST_ROUND_UP_4 (slen);
594
595 payload += slen;
596 payload_len -= slen;
597 }
598 break;
599 }
600 case 3:
601 {
602 /* one sample per packet, use adapter to combine based on marker bit. */
603 outbuf = gst_buffer_new_and_alloc (payload_len);
604 gst_buffer_fill (outbuf, 0, payload, payload_len);
605
606 gst_adapter_push (rtpxqtdepay->adapter, outbuf);
607 outbuf = NULL;
608
609 if (!m)
610 goto done;
611
612 avail = gst_adapter_available (rtpxqtdepay->adapter);
613 outbuf = gst_adapter_take_buffer (rtpxqtdepay->adapter, avail);
614
615 GST_DEBUG_OBJECT (rtpxqtdepay,
616 "gst_rtp_xqt_depay_chain: pushing buffer of size %u", avail);
617
618 goto done;
619 }
620 }
621 }
622
623 done:
624 gst_rtp_buffer_unmap (&rtp);
625 return outbuf;
626
627 need_resync:
628 {
629 GST_DEBUG_OBJECT (rtpxqtdepay, "waiting for marker");
630 goto done;
631 }
632 wrong_version:
633 {
634 GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
635 ("Unknown payload version."), (NULL));
636 goto done;
637 }
638 pck_reserved:
639 {
640 GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
641 ("PCK reserved 0."), (NULL));
642 goto done;
643 }
644 wrong_length:
645 {
646 GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
647 ("Wrong payload length."), (NULL));
648 goto done;
649 }
650 unknown_format:
651 {
652 GST_ELEMENT_WARNING (rtpxqtdepay, STREAM, DECODE,
653 ("Unknown payload format."), (NULL));
654 goto done;
655 }
656 }
657
658 static GstStateChangeReturn
gst_rtp_xqt_depay_change_state(GstElement * element,GstStateChange transition)659 gst_rtp_xqt_depay_change_state (GstElement * element, GstStateChange transition)
660 {
661 GstRtpXQTDepay *rtpxqtdepay;
662 GstStateChangeReturn ret;
663
664 rtpxqtdepay = GST_RTP_XQT_DEPAY (element);
665
666 switch (transition) {
667 case GST_STATE_CHANGE_READY_TO_PAUSED:
668 gst_adapter_clear (rtpxqtdepay->adapter);
669 rtpxqtdepay->previous_id = -1;
670 rtpxqtdepay->current_id = -1;
671 rtpxqtdepay->need_resync = TRUE;
672 rtpxqtdepay->have_sd = FALSE;
673 break;
674 default:
675 break;
676 }
677
678 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
679
680 switch (transition) {
681 case GST_STATE_CHANGE_PAUSED_TO_READY:
682 gst_adapter_clear (rtpxqtdepay->adapter);
683 default:
684 break;
685 }
686 return ret;
687 }
688