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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
26 #include <gst/rtp/gstrtpbuffer.h>
28 #include "gstrtpmp4gdepay.h"
29 #include "gstrtputils.h"
31 GST_DEBUG_CATEGORY_STATIC (rtpmp4gdepay_debug);
32 #define GST_CAT_DEFAULT (rtpmp4gdepay_debug)
34 static GstStaticPadTemplate gst_rtp_mp4g_depay_src_template =
35 GST_STATIC_PAD_TEMPLATE ("src",
38 GST_STATIC_CAPS ("video/mpeg,"
39 "mpegversion=(int) 4,"
40 "systemstream=(boolean)false;"
41 "audio/mpeg," "mpegversion=(int) 4, " "stream-format=(string)raw")
44 static GstStaticPadTemplate gst_rtp_mp4g_depay_sink_template =
45 GST_STATIC_PAD_TEMPLATE ("sink",
48 GST_STATIC_CAPS ("application/x-rtp, "
49 "media = (string) { \"video\", \"audio\", \"application\" }, "
50 "clock-rate = (int) [1, MAX ], "
51 "encoding-name = (string) \"MPEG4-GENERIC\", "
52 /* required string params */
53 /* "streamtype = (string) { \"4\", \"5\" }, " Not set by Wowza 4 = video, 5 = audio */
54 /* "profile-level-id = (string) [1,MAX], " */
55 /* "config = (string) [1,MAX]" */
56 "mode = (string) { \"generic\", \"CELP-cbr\", \"CELP-vbr\", \"AAC-lbr\", \"AAC-hbr\" } "
57 /* Optional general parameters */
58 /* "objecttype = (string) [1,MAX], " */
59 /* "constantsize = (string) [1,MAX], " *//* constant size of each AU */
60 /* "constantduration = (string) [1,MAX], " *//* constant duration of each AU */
61 /* "maxdisplacement = (string) [1,MAX], " */
62 /* "de-interleavebuffersize = (string) [1,MAX], " */
63 /* Optional configuration parameters */
64 /* "sizelength = (string) [1, 32], " */
65 /* "indexlength = (string) [1, 32], " */
66 /* "indexdeltalength = (string) [1, 32], " */
67 /* "ctsdeltalength = (string) [1, 32], " */
68 /* "dtsdeltalength = (string) [1, 32], " */
69 /* "randomaccessindication = (string) {0, 1}, " */
70 /* "streamstateindication = (string) [0, 32], " */
71 /* "auxiliarydatasizelength = (string) [0, 32]" */ )
74 /* simple bitstream parser */
79 gint head; /* bitpos in the cache of next bit */
80 guint64 cache; /* cached bytes */
84 gst_bs_parse_init (GstBsParse * bs, const guint8 * data, guint size)
87 bs->end = data + size;
89 bs->cache = 0xffffffff;
93 gst_bs_parse_read (GstBsParse * bs, guint n)
101 /* fill up the cache if we need to */
102 while (bs->head < n) {
103 if (bs->data >= bs->end) {
104 /* we're at the end, can't produce more than head number of bits */
108 /* shift bytes in cache, moving the head bits of the cache left */
109 bs->cache = (bs->cache << 8) | *bs->data++;
113 /* bring the required bits down and truncate */
114 if ((shift = bs->head - n) > 0)
115 res = bs->cache >> shift;
119 /* mask out required bits */
129 #define gst_rtp_mp4g_depay_parent_class parent_class
130 G_DEFINE_TYPE (GstRtpMP4GDepay, gst_rtp_mp4g_depay,
131 GST_TYPE_RTP_BASE_DEPAYLOAD);
133 static void gst_rtp_mp4g_depay_finalize (GObject * object);
135 static gboolean gst_rtp_mp4g_depay_setcaps (GstRTPBaseDepayload * depayload,
137 static GstBuffer *gst_rtp_mp4g_depay_process (GstRTPBaseDepayload * depayload,
139 static gboolean gst_rtp_mp4g_depay_handle_event (GstRTPBaseDepayload * filter,
142 static GstStateChangeReturn gst_rtp_mp4g_depay_change_state (GstElement *
143 element, GstStateChange transition);
147 gst_rtp_mp4g_depay_class_init (GstRtpMP4GDepayClass * klass)
149 GObjectClass *gobject_class;
150 GstElementClass *gstelement_class;
151 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
153 gobject_class = (GObjectClass *) klass;
154 gstelement_class = (GstElementClass *) klass;
155 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
157 gobject_class->finalize = gst_rtp_mp4g_depay_finalize;
159 gstelement_class->change_state = gst_rtp_mp4g_depay_change_state;
161 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mp4g_depay_process;
162 gstrtpbasedepayload_class->set_caps = gst_rtp_mp4g_depay_setcaps;
163 gstrtpbasedepayload_class->handle_event = gst_rtp_mp4g_depay_handle_event;
165 gst_element_class_add_pad_template (gstelement_class,
166 gst_static_pad_template_get (&gst_rtp_mp4g_depay_src_template));
167 gst_element_class_add_pad_template (gstelement_class,
168 gst_static_pad_template_get (&gst_rtp_mp4g_depay_sink_template));
170 gst_element_class_set_static_metadata (gstelement_class,
171 "RTP MPEG4 ES depayloader", "Codec/Depayloader/Network/RTP",
172 "Extracts MPEG4 elementary streams from RTP packets (RFC 3640)",
173 "Wim Taymans <wim.taymans@gmail.com>");
175 GST_DEBUG_CATEGORY_INIT (rtpmp4gdepay_debug, "rtpmp4gdepay", 0,
176 "MP4-generic RTP Depayloader");
180 gst_rtp_mp4g_depay_init (GstRtpMP4GDepay * rtpmp4gdepay)
182 rtpmp4gdepay->adapter = gst_adapter_new ();
183 rtpmp4gdepay->packets = g_queue_new ();
187 gst_rtp_mp4g_depay_finalize (GObject * object)
189 GstRtpMP4GDepay *rtpmp4gdepay;
191 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (object);
193 g_object_unref (rtpmp4gdepay->adapter);
194 rtpmp4gdepay->adapter = NULL;
195 g_queue_free (rtpmp4gdepay->packets);
196 rtpmp4gdepay->packets = NULL;
198 G_OBJECT_CLASS (parent_class)->finalize (object);
202 gst_rtp_mp4g_depay_parse_int (GstStructure * structure, const gchar * field,
208 if ((str = gst_structure_get_string (structure, field)))
211 if (gst_structure_get_int (structure, field, &res))
218 gst_rtp_mp4g_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
220 GstStructure *structure;
221 GstRtpMP4GDepay *rtpmp4gdepay;
222 GstCaps *srccaps = NULL;
228 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (depayload);
230 structure = gst_caps_get_structure (caps, 0);
232 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
233 clock_rate = 90000; /* default */
234 depayload->clock_rate = clock_rate;
236 if ((str = gst_structure_get_string (structure, "media"))) {
237 if (strcmp (str, "audio") == 0) {
238 srccaps = gst_caps_new_simple ("audio/mpeg",
239 "mpegversion", G_TYPE_INT, 4, "stream-format", G_TYPE_STRING, "raw",
241 } else if (strcmp (str, "video") == 0) {
242 srccaps = gst_caps_new_simple ("video/mpeg",
243 "mpegversion", G_TYPE_INT, 4,
244 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
250 /* these values are optional and have a default value of 0 (no header) */
251 rtpmp4gdepay->sizelength =
252 gst_rtp_mp4g_depay_parse_int (structure, "sizelength", 0);
253 rtpmp4gdepay->indexlength =
254 gst_rtp_mp4g_depay_parse_int (structure, "indexlength", 0);
255 rtpmp4gdepay->indexdeltalength =
256 gst_rtp_mp4g_depay_parse_int (structure, "indexdeltalength", 0);
257 rtpmp4gdepay->ctsdeltalength =
258 gst_rtp_mp4g_depay_parse_int (structure, "ctsdeltalength", 0);
259 rtpmp4gdepay->dtsdeltalength =
260 gst_rtp_mp4g_depay_parse_int (structure, "dtsdeltalength", 0);
262 gst_rtp_mp4g_depay_parse_int (structure, "randomaccessindication", 0);
263 rtpmp4gdepay->randomaccessindication = someint > 0 ? 1 : 0;
264 rtpmp4gdepay->streamstateindication =
265 gst_rtp_mp4g_depay_parse_int (structure, "streamstateindication", 0);
266 rtpmp4gdepay->auxiliarydatasizelength =
267 gst_rtp_mp4g_depay_parse_int (structure, "auxiliarydatasizelength", 0);
268 rtpmp4gdepay->constantSize =
269 gst_rtp_mp4g_depay_parse_int (structure, "constantsize", 0);
270 rtpmp4gdepay->constantDuration =
271 gst_rtp_mp4g_depay_parse_int (structure, "constantduration", 0);
272 rtpmp4gdepay->maxDisplacement =
273 gst_rtp_mp4g_depay_parse_int (structure, "maxdisplacement", 0);
276 /* get config string */
277 if ((str = gst_structure_get_string (structure, "config"))) {
280 g_value_init (&v, GST_TYPE_BUFFER);
281 if (gst_value_deserialize (&v, str)) {
284 buffer = gst_value_get_buffer (&v);
285 gst_caps_set_simple (srccaps,
286 "codec_data", GST_TYPE_BUFFER, buffer, NULL);
289 g_warning ("cannot convert config to buffer");
293 res = gst_pad_set_caps (depayload->srcpad, srccaps);
294 gst_caps_unref (srccaps);
301 GST_DEBUG_OBJECT (rtpmp4gdepay, "Unknown media type");
307 gst_rtp_mp4g_depay_clear_queue (GstRtpMP4GDepay * rtpmp4gdepay)
311 while ((outbuf = g_queue_pop_head (rtpmp4gdepay->packets)))
312 gst_buffer_unref (outbuf);
316 gst_rtp_mp4g_depay_reset (GstRtpMP4GDepay * rtpmp4gdepay)
318 gst_adapter_clear (rtpmp4gdepay->adapter);
319 rtpmp4gdepay->max_AU_index = -1;
320 rtpmp4gdepay->next_AU_index = -1;
321 rtpmp4gdepay->prev_AU_index = -1;
322 rtpmp4gdepay->prev_rtptime = -1;
323 rtpmp4gdepay->last_AU_index = -1;
324 gst_rtp_mp4g_depay_clear_queue (rtpmp4gdepay);
328 gst_rtp_mp4g_depay_flush_queue (GstRtpMP4GDepay * rtpmp4gdepay)
331 gboolean discont = FALSE;
334 while ((outbuf = g_queue_pop_head (rtpmp4gdepay->packets))) {
335 AU_index = GST_BUFFER_OFFSET (outbuf);
337 GST_DEBUG_OBJECT (rtpmp4gdepay, "next available AU_index %u", AU_index);
339 if (rtpmp4gdepay->next_AU_index != AU_index) {
340 GST_DEBUG_OBJECT (rtpmp4gdepay, "discont, expected AU_index %u",
341 rtpmp4gdepay->next_AU_index);
346 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
350 GST_DEBUG_OBJECT (rtpmp4gdepay, "pushing AU_index %u", AU_index);
351 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtpmp4gdepay), outbuf, 0);
352 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpmp4gdepay), outbuf);
353 rtpmp4gdepay->next_AU_index = AU_index + 1;
358 gst_rtp_mp4g_depay_queue (GstRtpMP4GDepay * rtpmp4gdepay, GstBuffer * outbuf)
360 guint AU_index = GST_BUFFER_OFFSET (outbuf);
362 if (rtpmp4gdepay->next_AU_index == -1) {
363 GST_DEBUG_OBJECT (rtpmp4gdepay, "Init AU counter %u", AU_index);
364 rtpmp4gdepay->next_AU_index = AU_index;
367 if (rtpmp4gdepay->next_AU_index == AU_index) {
368 GST_DEBUG_OBJECT (rtpmp4gdepay, "pushing expected AU_index %u", AU_index);
370 /* we received the expected packet, push it and flush as much as we can from
372 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtpmp4gdepay), outbuf, 0);
373 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpmp4gdepay), outbuf);
374 rtpmp4gdepay->next_AU_index++;
376 while ((outbuf = g_queue_peek_head (rtpmp4gdepay->packets))) {
377 AU_index = GST_BUFFER_OFFSET (outbuf);
379 GST_DEBUG_OBJECT (rtpmp4gdepay, "next available AU_index %u", AU_index);
381 if (rtpmp4gdepay->next_AU_index == AU_index) {
382 GST_DEBUG_OBJECT (rtpmp4gdepay, "pushing expected AU_index %u",
384 outbuf = g_queue_pop_head (rtpmp4gdepay->packets);
385 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtpmp4gdepay), outbuf, 0);
386 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpmp4gdepay),
388 rtpmp4gdepay->next_AU_index++;
390 GST_DEBUG_OBJECT (rtpmp4gdepay, "waiting for next AU_index %u",
391 rtpmp4gdepay->next_AU_index);
398 GST_DEBUG_OBJECT (rtpmp4gdepay, "queueing AU_index %u", AU_index);
400 /* loop the list to skip strictly smaller AU_index buffers */
401 for (list = rtpmp4gdepay->packets->head; list; list = g_list_next (list)) {
405 idx = GST_BUFFER_OFFSET (GST_BUFFER_CAST (list->data));
407 /* compare the new seqnum to the one in the buffer */
408 gap = (gint) (idx - AU_index);
410 GST_DEBUG_OBJECT (rtpmp4gdepay, "compare with AU_index %u, gap %d", idx,
413 /* AU_index <= idx, we can stop looking */
414 if (G_LIKELY (gap > 0))
418 g_queue_insert_before (rtpmp4gdepay->packets, list, outbuf);
420 g_queue_push_tail (rtpmp4gdepay->packets, outbuf);
425 gst_rtp_mp4g_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
427 GstRtpMP4GDepay *rtpmp4gdepay;
428 GstBuffer *outbuf = NULL;
429 GstClockTime timestamp;
431 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (depayload);
433 /* flush remaining data on discont */
434 if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
435 GST_DEBUG_OBJECT (rtpmp4gdepay, "received DISCONT");
436 gst_adapter_clear (rtpmp4gdepay->adapter);
439 timestamp = GST_BUFFER_PTS (rtp->buffer);
442 gint payload_len, payload_AU;
445 guint AU_headers_len;
446 guint AU_size, AU_index, AU_index_delta, payload_AU_size;
449 payload_len = gst_rtp_buffer_get_payload_len (rtp);
450 payload = gst_rtp_buffer_get_payload (rtp);
452 GST_DEBUG_OBJECT (rtpmp4gdepay, "received payload of %d", payload_len);
454 rtptime = gst_rtp_buffer_get_timestamp (rtp);
455 M = gst_rtp_buffer_get_marker (rtp);
457 if (rtpmp4gdepay->sizelength > 0) {
458 gint num_AU_headers, AU_headers_bytes, i;
464 /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
465 * |AU-headers-length|AU-header|AU-header| |AU-header|padding|
466 * | | (1) | (2) | | (n) * | bits |
467 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
469 * The length is 2 bytes and contains the length of the following
470 * AU-headers in bits.
472 AU_headers_len = (payload[0] << 8) | payload[1];
473 AU_headers_bytes = (AU_headers_len + 7) / 8;
474 num_AU_headers = AU_headers_len / 16;
476 GST_DEBUG_OBJECT (rtpmp4gdepay, "AU headers len %d, bytes %d, num %d",
477 AU_headers_len, AU_headers_bytes, num_AU_headers);
483 if (payload_len < AU_headers_bytes)
486 /* skip special headers, point to first payload AU */
487 payload_AU = 2 + AU_headers_bytes;
488 payload_AU_size = payload_len - AU_headers_bytes;
490 if (G_UNLIKELY (rtpmp4gdepay->auxiliarydatasizelength)) {
493 /* point the bitstream parser to the first auxiliary data bit */
494 gst_bs_parse_init (&bs, payload + AU_headers_bytes,
495 payload_len - AU_headers_bytes);
497 gst_bs_parse_read (&bs, rtpmp4gdepay->auxiliarydatasizelength);
498 /* convert to bytes */
499 aux_size = (aux_size + 7) / 8;
500 /* AU data then follows auxiliary data */
501 if (payload_AU_size < aux_size)
503 payload_AU += aux_size;
504 payload_AU_size -= aux_size;
507 /* point the bitstream parser to the first AU header bit */
508 gst_bs_parse_init (&bs, payload, payload_len);
509 AU_index = AU_index_delta = 0;
511 for (i = 0; i < num_AU_headers && payload_AU_size > 0; i++) {
513 * +---------------------------------------+
515 * +---------------------------------------+
516 * | AU-Index / AU-Index-delta |
517 * +---------------------------------------+
519 * +---------------------------------------+
521 * +---------------------------------------+
523 * +---------------------------------------+
525 * +---------------------------------------+
527 * +---------------------------------------+
529 * +---------------------------------------+
531 AU_size = gst_bs_parse_read (&bs, rtpmp4gdepay->sizelength);
533 /* calculate the AU_index, which is only on the first AU of the packet
534 * and the AU_index_delta on the other AUs. This will be used to
535 * reconstruct the AU ordering when interleaving. */
537 AU_index = gst_bs_parse_read (&bs, rtpmp4gdepay->indexlength);
539 GST_DEBUG_OBJECT (rtpmp4gdepay, "AU index %u", AU_index);
541 if (AU_index == 0 && rtpmp4gdepay->prev_AU_index == 0) {
545 /* if we see two consecutive packets with AU_index of 0, we can
546 * assume we have constantDuration packets. Since we don't have
547 * the index we must use the AU duration to calculate the
548 * index. Get the diff between the timestamps first, this can be
549 * positive or negative. */
550 if (rtpmp4gdepay->prev_rtptime <= rtptime)
551 diff = rtptime - rtpmp4gdepay->prev_rtptime;
553 diff = -(rtpmp4gdepay->prev_rtptime - rtptime);
555 /* if no constantDuration was given, make one */
556 if (rtpmp4gdepay->constantDuration != 0) {
557 cd = rtpmp4gdepay->constantDuration;
558 GST_DEBUG_OBJECT (depayload, "using constantDuration %d", cd);
559 } else if (rtpmp4gdepay->prev_AU_num > 0) {
560 /* use number of packets and of previous frame */
561 cd = diff / rtpmp4gdepay->prev_AU_num;
562 GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d", cd);
563 if (!GST_BUFFER_IS_DISCONT (rtp->buffer)) {
565 * if we see two consecutive packets with AU_index of 0 and
566 * there has been no discontinuity, we must conclude that this
567 * value of constantDuration is correct from now on. */
568 GST_DEBUG_OBJECT (depayload,
569 "constantDuration of %d detected", cd);
570 rtpmp4gdepay->constantDuration = cd;
573 /* assume this frame has the same number of packets as the
575 cd = diff / num_AU_headers;
576 GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d", cd);
580 /* get the number of packets by dividing with the duration */
586 rtpmp4gdepay->last_AU_index += diff;
587 rtpmp4gdepay->prev_AU_index = AU_index;
589 AU_index = rtpmp4gdepay->last_AU_index;
591 GST_DEBUG_OBJECT (rtpmp4gdepay, "diff %d, AU index %u", diff,
594 rtpmp4gdepay->prev_AU_index = AU_index;
595 rtpmp4gdepay->last_AU_index = AU_index;
598 /* keep track of the higest AU_index */
599 if (rtpmp4gdepay->max_AU_index != -1
600 && rtpmp4gdepay->max_AU_index <= AU_index) {
601 GST_DEBUG_OBJECT (rtpmp4gdepay, "new interleave group, flushing");
602 /* a new interleave group started, flush */
603 gst_rtp_mp4g_depay_flush_queue (rtpmp4gdepay);
605 if (G_UNLIKELY (!rtpmp4gdepay->maxDisplacement &&
606 rtpmp4gdepay->max_AU_index != -1
607 && rtpmp4gdepay->max_AU_index >= AU_index)) {
610 /* some broken non-interleaved streams have AU-index jumping around
611 * all over the place, apparently assuming receiver disregards */
612 GST_DEBUG_OBJECT (rtpmp4gdepay, "non-interleaved broken AU indices;"
613 " forcing continuous flush");
614 /* reset AU to avoid repeated DISCONT in such case */
615 outbuf = g_queue_peek_head (rtpmp4gdepay->packets);
616 if (G_LIKELY (outbuf)) {
617 rtpmp4gdepay->next_AU_index = GST_BUFFER_OFFSET (outbuf);
618 gst_rtp_mp4g_depay_flush_queue (rtpmp4gdepay);
620 /* rebase next_AU_index to current rtp's first AU_index */
621 rtpmp4gdepay->next_AU_index = AU_index;
623 rtpmp4gdepay->prev_rtptime = rtptime;
624 rtpmp4gdepay->prev_AU_num = num_AU_headers;
627 gst_bs_parse_read (&bs, rtpmp4gdepay->indexdeltalength);
628 AU_index += AU_index_delta + 1;
630 /* keep track of highest AU_index */
631 if (rtpmp4gdepay->max_AU_index == -1
632 || AU_index > rtpmp4gdepay->max_AU_index)
633 rtpmp4gdepay->max_AU_index = AU_index;
635 /* the presentation time offset, a 2s-complement value, we need this to
636 * calculate the timestamp on the output packet. */
637 if (rtpmp4gdepay->ctsdeltalength > 0) {
638 if (gst_bs_parse_read (&bs, 1))
639 gst_bs_parse_read (&bs, rtpmp4gdepay->ctsdeltalength);
641 /* the decoding time offset, a 2s-complement value */
642 if (rtpmp4gdepay->dtsdeltalength > 0) {
643 if (gst_bs_parse_read (&bs, 1))
644 gst_bs_parse_read (&bs, rtpmp4gdepay->dtsdeltalength);
646 /* RAP-flag to indicate that the AU contains a keyframe */
647 if (rtpmp4gdepay->randomaccessindication)
648 gst_bs_parse_read (&bs, 1);
650 if (rtpmp4gdepay->streamstateindication > 0)
651 gst_bs_parse_read (&bs, rtpmp4gdepay->streamstateindication);
653 GST_DEBUG_OBJECT (rtpmp4gdepay, "size %d, index %d, delta %d", AU_size,
654 AU_index, AU_index_delta);
656 /* fragmented pakets have the AU_size set to the size of the
657 * unfragmented AU. */
658 if (AU_size > payload_AU_size)
659 AU_size = payload_AU_size;
661 /* collect stuff in the adapter, strip header from payload and push in
664 gst_rtp_buffer_get_payload_subbuffer (rtp, payload_AU, AU_size);
665 gst_adapter_push (rtpmp4gdepay->adapter, outbuf);
670 /* packet is complete, flush */
671 avail = gst_adapter_available (rtpmp4gdepay->adapter);
673 outbuf = gst_adapter_take_buffer (rtpmp4gdepay->adapter, avail);
675 /* copy some of the fields we calculated above on the buffer. We also
676 * copy the AU_index so that we can sort the packets in our queue. */
677 GST_BUFFER_PTS (outbuf) = timestamp;
678 GST_BUFFER_OFFSET (outbuf) = AU_index;
680 if (rtpmp4gdepay->constantDuration != 0) {
681 /* if we have constantDuration, calculate timestamp for next AU
682 * in this RTP packet. */
683 timestamp += (rtpmp4gdepay->constantDuration * GST_SECOND) /
684 depayload->clock_rate;
686 /* otherwise, make sure we don't use the timestamp again for other
688 timestamp = GST_CLOCK_TIME_NONE;
691 GST_DEBUG_OBJECT (depayload,
692 "pushing buffer of size %" G_GSIZE_FORMAT,
693 gst_buffer_get_size (outbuf));
695 gst_rtp_mp4g_depay_queue (rtpmp4gdepay, outbuf);
698 payload_AU += AU_size;
699 payload_AU_size -= AU_size;
702 /* push complete buffer in adapter */
703 outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, 0, payload_len);
704 gst_adapter_push (rtpmp4gdepay->adapter, outbuf);
706 /* if this was the last packet of the VOP, create and push a buffer */
710 avail = gst_adapter_available (rtpmp4gdepay->adapter);
712 outbuf = gst_adapter_take_buffer (rtpmp4gdepay->adapter, avail);
714 GST_DEBUG ("gst_rtp_mp4g_depay_chain: pushing buffer of size %"
715 G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
727 GST_ELEMENT_WARNING (rtpmp4gdepay, STREAM, DECODE,
728 ("Packet payload was too short."), (NULL));
734 gst_rtp_mp4g_depay_handle_event (GstRTPBaseDepayload * filter, GstEvent * event)
737 GstRtpMP4GDepay *rtpmp4gdepay;
739 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (filter);
741 switch (GST_EVENT_TYPE (event)) {
742 case GST_EVENT_FLUSH_STOP:
743 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
750 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (filter, event);
755 static GstStateChangeReturn
756 gst_rtp_mp4g_depay_change_state (GstElement * element,
757 GstStateChange transition)
759 GstRtpMP4GDepay *rtpmp4gdepay;
760 GstStateChangeReturn ret;
762 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (element);
764 switch (transition) {
765 case GST_STATE_CHANGE_READY_TO_PAUSED:
766 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
772 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
774 switch (transition) {
775 case GST_STATE_CHANGE_PAUSED_TO_READY:
776 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
785 gst_rtp_mp4g_depay_plugin_init (GstPlugin * plugin)
787 return gst_element_register (plugin, "rtpmp4gdepay",
788 GST_RANK_SECONDARY, GST_TYPE_RTP_MP4G_DEPAY);