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_static_pad_template (gstelement_class,
166 &gst_rtp_mp4g_depay_src_template);
167 gst_element_class_add_static_pad_template (gstelement_class,
168 &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 rtpmp4gdepay->check_adts = FALSE;
238 if ((str = gst_structure_get_string (structure, "media"))) {
239 if (strcmp (str, "audio") == 0) {
240 srccaps = gst_caps_new_simple ("audio/mpeg",
241 "mpegversion", G_TYPE_INT, 4, "stream-format", G_TYPE_STRING, "raw",
243 rtpmp4gdepay->check_adts = TRUE;
244 } else if (strcmp (str, "video") == 0) {
245 srccaps = gst_caps_new_simple ("video/mpeg",
246 "mpegversion", G_TYPE_INT, 4,
247 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
253 /* these values are optional and have a default value of 0 (no header) */
254 rtpmp4gdepay->sizelength =
255 gst_rtp_mp4g_depay_parse_int (structure, "sizelength", 0);
256 rtpmp4gdepay->indexlength =
257 gst_rtp_mp4g_depay_parse_int (structure, "indexlength", 0);
258 rtpmp4gdepay->indexdeltalength =
259 gst_rtp_mp4g_depay_parse_int (structure, "indexdeltalength", 0);
260 rtpmp4gdepay->ctsdeltalength =
261 gst_rtp_mp4g_depay_parse_int (structure, "ctsdeltalength", 0);
262 rtpmp4gdepay->dtsdeltalength =
263 gst_rtp_mp4g_depay_parse_int (structure, "dtsdeltalength", 0);
265 gst_rtp_mp4g_depay_parse_int (structure, "randomaccessindication", 0);
266 rtpmp4gdepay->randomaccessindication = someint > 0 ? 1 : 0;
267 rtpmp4gdepay->streamstateindication =
268 gst_rtp_mp4g_depay_parse_int (structure, "streamstateindication", 0);
269 rtpmp4gdepay->auxiliarydatasizelength =
270 gst_rtp_mp4g_depay_parse_int (structure, "auxiliarydatasizelength", 0);
271 rtpmp4gdepay->constantSize =
272 gst_rtp_mp4g_depay_parse_int (structure, "constantsize", 0);
273 rtpmp4gdepay->constantDuration =
274 gst_rtp_mp4g_depay_parse_int (structure, "constantduration", 0);
275 rtpmp4gdepay->maxDisplacement =
276 gst_rtp_mp4g_depay_parse_int (structure, "maxdisplacement", 0);
279 /* get config string */
280 if ((str = gst_structure_get_string (structure, "config"))) {
283 g_value_init (&v, GST_TYPE_BUFFER);
284 if (gst_value_deserialize (&v, str)) {
287 buffer = gst_value_get_buffer (&v);
288 gst_caps_set_simple (srccaps,
289 "codec_data", GST_TYPE_BUFFER, buffer, NULL);
292 g_warning ("cannot convert config to buffer");
296 res = gst_pad_set_caps (depayload->srcpad, srccaps);
297 gst_caps_unref (srccaps);
304 GST_DEBUG_OBJECT (rtpmp4gdepay, "Unknown media type");
310 gst_rtp_mp4g_depay_clear_queue (GstRtpMP4GDepay * rtpmp4gdepay)
314 while ((outbuf = g_queue_pop_head (rtpmp4gdepay->packets)))
315 gst_buffer_unref (outbuf);
319 gst_rtp_mp4g_depay_reset (GstRtpMP4GDepay * rtpmp4gdepay)
321 gst_adapter_clear (rtpmp4gdepay->adapter);
322 rtpmp4gdepay->max_AU_index = -1;
323 rtpmp4gdepay->next_AU_index = -1;
324 rtpmp4gdepay->prev_AU_index = -1;
325 rtpmp4gdepay->prev_rtptime = -1;
326 rtpmp4gdepay->last_AU_index = -1;
327 gst_rtp_mp4g_depay_clear_queue (rtpmp4gdepay);
331 gst_rtp_mp4g_depay_push_outbuf (GstRtpMP4GDepay * rtpmp4gdepay,
332 GstBuffer * outbuf, guint AU_index)
334 gboolean discont = FALSE;
336 if (AU_index != rtpmp4gdepay->next_AU_index) {
337 GST_DEBUG_OBJECT (rtpmp4gdepay, "discont, expected AU_index %u",
338 rtpmp4gdepay->next_AU_index);
339 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
343 GST_DEBUG_OBJECT (rtpmp4gdepay, "pushing %sAU_index %u",
344 discont ? "" : "expected ", AU_index);
346 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtpmp4gdepay), outbuf, 0);
347 gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtpmp4gdepay), outbuf);
348 rtpmp4gdepay->next_AU_index = AU_index + 1;
352 gst_rtp_mp4g_depay_flush_queue (GstRtpMP4GDepay * rtpmp4gdepay)
357 while ((outbuf = g_queue_pop_head (rtpmp4gdepay->packets))) {
358 AU_index = GST_BUFFER_OFFSET (outbuf);
360 GST_DEBUG_OBJECT (rtpmp4gdepay, "next available AU_index %u", AU_index);
362 gst_rtp_mp4g_depay_push_outbuf (rtpmp4gdepay, outbuf, AU_index);
367 gst_rtp_mp4g_depay_queue (GstRtpMP4GDepay * rtpmp4gdepay, GstBuffer * outbuf)
369 guint AU_index = GST_BUFFER_OFFSET (outbuf);
371 if (rtpmp4gdepay->next_AU_index == -1) {
372 GST_DEBUG_OBJECT (rtpmp4gdepay, "Init AU counter %u", AU_index);
373 rtpmp4gdepay->next_AU_index = AU_index;
376 if (rtpmp4gdepay->next_AU_index == AU_index) {
377 GST_DEBUG_OBJECT (rtpmp4gdepay, "pushing expected AU_index %u", AU_index);
379 /* we received the expected packet, push it and flush as much as we can from
381 gst_rtp_mp4g_depay_push_outbuf (rtpmp4gdepay, outbuf, AU_index);
383 while ((outbuf = g_queue_peek_head (rtpmp4gdepay->packets))) {
384 AU_index = GST_BUFFER_OFFSET (outbuf);
386 GST_DEBUG_OBJECT (rtpmp4gdepay, "next available AU_index %u", AU_index);
388 if (rtpmp4gdepay->next_AU_index == AU_index) {
389 outbuf = g_queue_pop_head (rtpmp4gdepay->packets);
390 gst_rtp_mp4g_depay_push_outbuf (rtpmp4gdepay, outbuf, AU_index);
392 GST_DEBUG_OBJECT (rtpmp4gdepay, "waiting for next AU_index %u",
393 rtpmp4gdepay->next_AU_index);
400 GST_DEBUG_OBJECT (rtpmp4gdepay, "queueing AU_index %u", AU_index);
402 /* loop the list to skip strictly smaller AU_index buffers */
403 for (list = rtpmp4gdepay->packets->head; list; list = g_list_next (list)) {
407 idx = GST_BUFFER_OFFSET (GST_BUFFER_CAST (list->data));
409 /* compare the new seqnum to the one in the buffer */
410 gap = (gint) (idx - AU_index);
412 GST_DEBUG_OBJECT (rtpmp4gdepay, "compare with AU_index %u, gap %d", idx,
415 /* AU_index <= idx, we can stop looking */
416 if (G_LIKELY (gap > 0))
420 g_queue_insert_before (rtpmp4gdepay->packets, list, outbuf);
422 g_queue_push_tail (rtpmp4gdepay->packets, outbuf);
427 gst_rtp_mp4g_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
429 GstRtpMP4GDepay *rtpmp4gdepay;
430 GstBuffer *outbuf = NULL;
431 GstClockTime timestamp;
433 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (depayload);
435 /* flush remaining data on discont */
436 if (GST_BUFFER_IS_DISCONT (rtp->buffer)) {
437 GST_DEBUG_OBJECT (rtpmp4gdepay, "received DISCONT");
438 gst_adapter_clear (rtpmp4gdepay->adapter);
441 timestamp = GST_BUFFER_PTS (rtp->buffer);
444 gint payload_len, payload_AU;
447 guint AU_headers_len;
448 guint AU_size, AU_index, AU_index_delta, payload_AU_size;
451 payload_len = gst_rtp_buffer_get_payload_len (rtp);
452 payload = gst_rtp_buffer_get_payload (rtp);
454 GST_DEBUG_OBJECT (rtpmp4gdepay, "received payload of %d", payload_len);
456 rtptime = gst_rtp_buffer_get_timestamp (rtp);
457 M = gst_rtp_buffer_get_marker (rtp);
459 if (rtpmp4gdepay->sizelength > 0) {
460 gint num_AU_headers, AU_headers_bytes, i;
466 /* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
467 * |AU-headers-length|AU-header|AU-header| |AU-header|padding|
468 * | | (1) | (2) | | (n) * | bits |
469 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
471 * The length is 2 bytes and contains the length of the following
472 * AU-headers in bits.
474 AU_headers_len = (payload[0] << 8) | payload[1];
475 AU_headers_bytes = (AU_headers_len + 7) / 8;
476 num_AU_headers = AU_headers_len / 16;
478 GST_DEBUG_OBJECT (rtpmp4gdepay, "AU headers len %d, bytes %d, num %d",
479 AU_headers_len, AU_headers_bytes, num_AU_headers);
485 if (payload_len < AU_headers_bytes)
488 /* skip special headers, point to first payload AU */
489 payload_AU = 2 + AU_headers_bytes;
490 payload_AU_size = payload_len - AU_headers_bytes;
492 if (G_UNLIKELY (rtpmp4gdepay->auxiliarydatasizelength)) {
495 /* point the bitstream parser to the first auxiliary data bit */
496 gst_bs_parse_init (&bs, payload + AU_headers_bytes,
497 payload_len - AU_headers_bytes);
499 gst_bs_parse_read (&bs, rtpmp4gdepay->auxiliarydatasizelength);
500 /* convert to bytes */
501 aux_size = (aux_size + 7) / 8;
502 /* AU data then follows auxiliary data */
503 if (payload_AU_size < aux_size)
505 payload_AU += aux_size;
506 payload_AU_size -= aux_size;
509 /* point the bitstream parser to the first AU header bit */
510 gst_bs_parse_init (&bs, payload, payload_len);
511 AU_index = AU_index_delta = 0;
513 for (i = 0; i < num_AU_headers && payload_AU_size > 0; i++) {
515 * +---------------------------------------+
517 * +---------------------------------------+
518 * | AU-Index / AU-Index-delta |
519 * +---------------------------------------+
521 * +---------------------------------------+
523 * +---------------------------------------+
525 * +---------------------------------------+
527 * +---------------------------------------+
529 * +---------------------------------------+
531 * +---------------------------------------+
533 AU_size = gst_bs_parse_read (&bs, rtpmp4gdepay->sizelength);
535 /* calculate the AU_index, which is only on the first AU of the packet
536 * and the AU_index_delta on the other AUs. This will be used to
537 * reconstruct the AU ordering when interleaving. */
539 AU_index = gst_bs_parse_read (&bs, rtpmp4gdepay->indexlength);
541 GST_DEBUG_OBJECT (rtpmp4gdepay, "AU index %u", AU_index);
543 if (AU_index == 0 && rtpmp4gdepay->prev_AU_index == 0) {
547 /* if we see two consecutive packets with AU_index of 0, we can
548 * assume we have constantDuration packets. Since we don't have
549 * the index we must use the AU duration to calculate the
550 * index. Get the diff between the timestamps first, this can be
551 * positive or negative. */
552 if (rtpmp4gdepay->prev_rtptime <= rtptime)
553 diff = rtptime - rtpmp4gdepay->prev_rtptime;
555 diff = -(rtpmp4gdepay->prev_rtptime - rtptime);
557 /* if no constantDuration was given, make one */
558 if (rtpmp4gdepay->constantDuration != 0) {
559 cd = rtpmp4gdepay->constantDuration;
560 GST_DEBUG_OBJECT (depayload, "using constantDuration %d", cd);
561 } else if (rtpmp4gdepay->prev_AU_num > 0) {
562 /* use number of packets and of previous frame */
563 cd = diff / rtpmp4gdepay->prev_AU_num;
564 GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d", cd);
565 if (!GST_BUFFER_IS_DISCONT (rtp->buffer)) {
567 * if we see two consecutive packets with AU_index of 0 and
568 * there has been no discontinuity, we must conclude that this
569 * value of constantDuration is correct from now on. */
570 GST_DEBUG_OBJECT (depayload,
571 "constantDuration of %d detected", cd);
572 rtpmp4gdepay->constantDuration = cd;
575 /* assume this frame has the same number of packets as the
577 cd = diff / num_AU_headers;
578 GST_DEBUG_OBJECT (depayload, "guessing constantDuration %d", cd);
582 /* get the number of packets by dividing with the duration */
588 rtpmp4gdepay->last_AU_index += diff;
589 rtpmp4gdepay->prev_AU_index = AU_index;
591 AU_index = rtpmp4gdepay->last_AU_index;
593 GST_DEBUG_OBJECT (rtpmp4gdepay, "diff %d, AU index %u", diff,
596 rtpmp4gdepay->prev_AU_index = AU_index;
597 rtpmp4gdepay->last_AU_index = AU_index;
600 /* keep track of the higest AU_index */
601 if (rtpmp4gdepay->max_AU_index != -1
602 && rtpmp4gdepay->max_AU_index <= AU_index) {
603 GST_DEBUG_OBJECT (rtpmp4gdepay, "new interleave group, flushing");
604 /* a new interleave group started, flush */
605 gst_rtp_mp4g_depay_flush_queue (rtpmp4gdepay);
607 if (G_UNLIKELY (!rtpmp4gdepay->maxDisplacement &&
608 rtpmp4gdepay->max_AU_index != -1
609 && rtpmp4gdepay->max_AU_index >= AU_index)) {
612 /* some broken non-interleaved streams have AU-index jumping around
613 * all over the place, apparently assuming receiver disregards */
614 GST_DEBUG_OBJECT (rtpmp4gdepay, "non-interleaved broken AU indices;"
615 " forcing continuous flush");
616 /* reset AU to avoid repeated DISCONT in such case */
617 outbuf = g_queue_peek_head (rtpmp4gdepay->packets);
618 if (G_LIKELY (outbuf)) {
619 rtpmp4gdepay->next_AU_index = GST_BUFFER_OFFSET (outbuf);
620 gst_rtp_mp4g_depay_flush_queue (rtpmp4gdepay);
622 /* rebase next_AU_index to current rtp's first AU_index */
623 rtpmp4gdepay->next_AU_index = AU_index;
625 rtpmp4gdepay->prev_rtptime = rtptime;
626 rtpmp4gdepay->prev_AU_num = num_AU_headers;
629 gst_bs_parse_read (&bs, rtpmp4gdepay->indexdeltalength);
630 AU_index += AU_index_delta + 1;
632 /* keep track of highest AU_index */
633 if (rtpmp4gdepay->max_AU_index == -1
634 || AU_index > rtpmp4gdepay->max_AU_index)
635 rtpmp4gdepay->max_AU_index = AU_index;
637 /* the presentation time offset, a 2s-complement value, we need this to
638 * calculate the timestamp on the output packet. */
639 if (rtpmp4gdepay->ctsdeltalength > 0) {
640 if (gst_bs_parse_read (&bs, 1))
641 gst_bs_parse_read (&bs, rtpmp4gdepay->ctsdeltalength);
643 /* the decoding time offset, a 2s-complement value */
644 if (rtpmp4gdepay->dtsdeltalength > 0) {
645 if (gst_bs_parse_read (&bs, 1))
646 gst_bs_parse_read (&bs, rtpmp4gdepay->dtsdeltalength);
648 /* RAP-flag to indicate that the AU contains a keyframe */
649 if (rtpmp4gdepay->randomaccessindication)
650 gst_bs_parse_read (&bs, 1);
652 if (rtpmp4gdepay->streamstateindication > 0)
653 gst_bs_parse_read (&bs, rtpmp4gdepay->streamstateindication);
655 GST_DEBUG_OBJECT (rtpmp4gdepay, "size %d, index %d, delta %d", AU_size,
656 AU_index, AU_index_delta);
658 /* fragmented pakets have the AU_size set to the size of the
659 * unfragmented AU. */
660 if (AU_size > payload_AU_size)
661 AU_size = payload_AU_size;
663 /* collect stuff in the adapter, strip header from payload and push in
666 gst_rtp_buffer_get_payload_subbuffer (rtp, payload_AU, AU_size);
667 gst_adapter_push (rtpmp4gdepay->adapter, outbuf);
673 /* packet is complete, flush */
674 avail = gst_adapter_available (rtpmp4gdepay->adapter);
676 /* Some broken senders send ADTS headers (e.g. some Sony cameras).
677 * Try to detect those and skip them (still needs config set), but
678 * don't check every frame, only the first (unless we detect ADTS) */
679 if (rtpmp4gdepay->check_adts && avail >= 7) {
680 if (gst_adapter_masked_scan_uint32_peek (rtpmp4gdepay->adapter,
681 0xfffe0000, 0xfff00000, 0, 4, &v) == 0) {
682 guint adts_hdr_len = (((v >> 16) & 0x1) == 0) ? 9 : 7;
683 if (avail > adts_hdr_len) {
684 GST_WARNING_OBJECT (rtpmp4gdepay, "Detected ADTS header of "
685 "%u bytes, skipping", adts_hdr_len);
686 gst_adapter_flush (rtpmp4gdepay->adapter, adts_hdr_len);
687 avail -= adts_hdr_len;
690 rtpmp4gdepay->check_adts = FALSE;
694 outbuf = gst_adapter_take_buffer (rtpmp4gdepay->adapter, avail);
696 /* copy some of the fields we calculated above on the buffer. We also
697 * copy the AU_index so that we can sort the packets in our queue. */
698 GST_BUFFER_PTS (outbuf) = timestamp;
699 GST_BUFFER_OFFSET (outbuf) = AU_index;
701 if (rtpmp4gdepay->constantDuration != 0) {
702 /* if we have constantDuration, calculate timestamp for next AU
703 * in this RTP packet. */
704 timestamp += (rtpmp4gdepay->constantDuration * GST_SECOND) /
705 depayload->clock_rate;
707 /* otherwise, make sure we don't use the timestamp again for other
709 timestamp = GST_CLOCK_TIME_NONE;
712 GST_DEBUG_OBJECT (depayload,
713 "pushing buffer of size %" G_GSIZE_FORMAT,
714 gst_buffer_get_size (outbuf));
716 gst_rtp_mp4g_depay_queue (rtpmp4gdepay, outbuf);
719 payload_AU += AU_size;
720 payload_AU_size -= AU_size;
723 /* push complete buffer in adapter */
724 outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, 0, payload_len);
725 gst_adapter_push (rtpmp4gdepay->adapter, outbuf);
727 /* if this was the last packet of the VOP, create and push a buffer */
731 avail = gst_adapter_available (rtpmp4gdepay->adapter);
733 outbuf = gst_adapter_take_buffer (rtpmp4gdepay->adapter, avail);
735 GST_DEBUG ("gst_rtp_mp4g_depay_chain: pushing buffer of size %"
736 G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
748 GST_ELEMENT_WARNING (rtpmp4gdepay, STREAM, DECODE,
749 ("Packet payload was too short."), (NULL));
755 gst_rtp_mp4g_depay_handle_event (GstRTPBaseDepayload * filter, GstEvent * event)
758 GstRtpMP4GDepay *rtpmp4gdepay;
760 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (filter);
762 switch (GST_EVENT_TYPE (event)) {
763 case GST_EVENT_FLUSH_STOP:
764 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
771 GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (filter, event);
776 static GstStateChangeReturn
777 gst_rtp_mp4g_depay_change_state (GstElement * element,
778 GstStateChange transition)
780 GstRtpMP4GDepay *rtpmp4gdepay;
781 GstStateChangeReturn ret;
783 rtpmp4gdepay = GST_RTP_MP4G_DEPAY (element);
785 switch (transition) {
786 case GST_STATE_CHANGE_READY_TO_PAUSED:
787 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
793 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
795 switch (transition) {
796 case GST_STATE_CHANGE_PAUSED_TO_READY:
797 gst_rtp_mp4g_depay_reset (rtpmp4gdepay);
806 gst_rtp_mp4g_depay_plugin_init (GstPlugin * plugin)
808 return gst_element_register (plugin, "rtpmp4gdepay",
809 GST_RANK_SECONDARY, GST_TYPE_RTP_MP4G_DEPAY);