1 /* RTP Retransmission sender element for GStreamer
5 * Copyright (C) 2013 Collabora Ltd.
6 * @author Julien Isorce <julien.isorce@collabora.co.uk>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
25 * SECTION:element-rtprtxsend
27 * See #GstRtpRtxReceive for examples
29 * The purpose of the sender RTX object is to keep a history of RTP packets up
30 * to a configurable limit (max-size-time or max-size-packets). It will listen
31 * for upstream custom retransmission events (GstRTPRetransmissionRequest) that
32 * comes from downstream (#GstRtpSession). When receiving a request it will
33 * look up the requested seqnum in its list of stored packets. If the packet
34 * is available, it will create a RTX packet according to RFC 4588 and send
35 * this as an auxiliary stream. RTX is SSRC-multiplexed
43 #include <gst/rtp/gstrtpbuffer.h>
47 #include "gstrtprtxsend.h"
49 GST_DEBUG_CATEGORY_STATIC (gst_rtp_rtx_send_debug);
50 #define GST_CAT_DEFAULT gst_rtp_rtx_send_debug
52 #define DEFAULT_RTX_PAYLOAD_TYPE 0
53 #define DEFAULT_MAX_SIZE_TIME 0
54 #define DEFAULT_MAX_SIZE_PACKETS 100
60 PROP_PAYLOAD_TYPE_MAP,
62 PROP_MAX_SIZE_PACKETS,
63 PROP_NUM_RTX_REQUESTS,
68 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
71 GST_STATIC_CAPS ("application/x-rtp")
74 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
77 GST_STATIC_CAPS ("application/x-rtp")
80 static gboolean gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
81 guint visible, guint bytes, guint64 time, gpointer checkdata);
83 static gboolean gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent,
85 static gboolean gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent,
87 static GstFlowReturn gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent,
90 static void gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx);
91 static gboolean gst_rtp_rtx_send_activate_mode (GstPad * pad,
92 GstObject * parent, GstPadMode mode, gboolean active);
94 static GstStateChangeReturn gst_rtp_rtx_send_change_state (GstElement *
95 element, GstStateChange transition);
97 static void gst_rtp_rtx_send_set_property (GObject * object, guint prop_id,
98 const GValue * value, GParamSpec * pspec);
99 static void gst_rtp_rtx_send_get_property (GObject * object, guint prop_id,
100 GValue * value, GParamSpec * pspec);
101 static void gst_rtp_rtx_send_finalize (GObject * object);
103 G_DEFINE_TYPE (GstRtpRtxSend, gst_rtp_rtx_send, GST_TYPE_ELEMENT);
113 buffer_queue_item_free (BufferQueueItem * item)
115 gst_buffer_unref (item->buffer);
116 g_slice_free (BufferQueueItem, item);
125 /* history of rtp packets */
130 ssrc_rtx_data_new (guint32 rtx_ssrc)
132 SSRCRtxData *data = g_slice_new0 (SSRCRtxData);
134 data->rtx_ssrc = rtx_ssrc;
135 data->next_seqnum = g_random_int_range (0, G_MAXUINT16);
136 data->queue = g_sequence_new ((GDestroyNotify) buffer_queue_item_free);
142 ssrc_rtx_data_free (SSRCRtxData * data)
144 g_sequence_free (data->queue);
145 g_slice_free (SSRCRtxData, data);
149 gst_rtp_rtx_send_class_init (GstRtpRtxSendClass * klass)
151 GObjectClass *gobject_class;
152 GstElementClass *gstelement_class;
154 gobject_class = (GObjectClass *) klass;
155 gstelement_class = (GstElementClass *) klass;
157 gobject_class->get_property = gst_rtp_rtx_send_get_property;
158 gobject_class->set_property = gst_rtp_rtx_send_set_property;
159 gobject_class->finalize = gst_rtp_rtx_send_finalize;
161 g_object_class_install_property (gobject_class, PROP_SSRC_MAP,
162 g_param_spec_boxed ("ssrc-map", "SSRC Map",
163 "Map of SSRCs to their retransmission SSRCs for SSRC-multiplexed mode"
164 " (default = random)", GST_TYPE_STRUCTURE,
165 G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
167 g_object_class_install_property (gobject_class, PROP_PAYLOAD_TYPE_MAP,
168 g_param_spec_boxed ("payload-type-map", "Payload Type Map",
169 "Map of original payload types to their retransmission payload types",
170 GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
172 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
173 g_param_spec_uint ("max-size-time", "Max Size Time",
174 "Amount of ms to queue (0 = unlimited)", 0, G_MAXUINT,
175 DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
177 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_PACKETS,
178 g_param_spec_uint ("max-size-packets", "Max Size Packets",
179 "Amount of packets to queue (0 = unlimited)", 0, G_MAXINT16,
180 DEFAULT_MAX_SIZE_PACKETS,
181 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
183 g_object_class_install_property (gobject_class, PROP_NUM_RTX_REQUESTS,
184 g_param_spec_uint ("num-rtx-requests", "Num RTX Requests",
185 "Number of retransmission events received", 0, G_MAXUINT,
186 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
188 g_object_class_install_property (gobject_class, PROP_NUM_RTX_PACKETS,
189 g_param_spec_uint ("num-rtx-packets", "Num RTX Packets",
190 " Number of retransmission packets sent", 0, G_MAXUINT,
191 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
193 gst_element_class_add_pad_template (gstelement_class,
194 gst_static_pad_template_get (&src_factory));
195 gst_element_class_add_pad_template (gstelement_class,
196 gst_static_pad_template_get (&sink_factory));
198 gst_element_class_set_static_metadata (gstelement_class,
199 "RTP Retransmission Sender", "Codec",
200 "Retransmit RTP packets when needed, according to RFC4588",
201 "Julien Isorce <julien.isorce@collabora.co.uk>");
203 gstelement_class->change_state =
204 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_change_state);
208 gst_rtp_rtx_send_reset (GstRtpRtxSend * rtx)
210 GST_OBJECT_LOCK (rtx);
211 gst_data_queue_flush (rtx->queue);
212 g_hash_table_remove_all (rtx->ssrc_data);
213 g_hash_table_remove_all (rtx->rtx_ssrcs);
214 rtx->num_rtx_requests = 0;
215 rtx->num_rtx_packets = 0;
216 GST_OBJECT_UNLOCK (rtx);
220 gst_rtp_rtx_send_finalize (GObject * object)
222 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
224 g_hash_table_unref (rtx->ssrc_data);
225 g_hash_table_unref (rtx->rtx_ssrcs);
226 if (rtx->external_ssrc_map)
227 gst_structure_free (rtx->external_ssrc_map);
228 g_hash_table_unref (rtx->rtx_pt_map);
229 if (rtx->rtx_pt_map_structure)
230 gst_structure_free (rtx->rtx_pt_map_structure);
231 g_object_unref (rtx->queue);
233 G_OBJECT_CLASS (gst_rtp_rtx_send_parent_class)->finalize (object);
237 gst_rtp_rtx_send_init (GstRtpRtxSend * rtx)
239 GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtx);
242 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
244 GST_PAD_SET_PROXY_CAPS (rtx->srcpad);
245 GST_PAD_SET_PROXY_ALLOCATION (rtx->srcpad);
246 gst_pad_set_event_function (rtx->srcpad,
247 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_src_event));
248 gst_pad_set_activatemode_function (rtx->srcpad,
249 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_activate_mode));
250 gst_element_add_pad (GST_ELEMENT (rtx), rtx->srcpad);
253 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
255 GST_PAD_SET_PROXY_CAPS (rtx->sinkpad);
256 GST_PAD_SET_PROXY_ALLOCATION (rtx->sinkpad);
257 gst_pad_set_event_function (rtx->sinkpad,
258 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_sink_event));
259 gst_pad_set_chain_function (rtx->sinkpad,
260 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain));
261 gst_element_add_pad (GST_ELEMENT (rtx), rtx->sinkpad);
263 rtx->queue = gst_data_queue_new (gst_rtp_rtx_send_queue_check_full, NULL,
265 rtx->ssrc_data = g_hash_table_new_full (g_direct_hash, g_direct_equal,
266 NULL, (GDestroyNotify) ssrc_rtx_data_free);
267 rtx->rtx_ssrcs = g_hash_table_new (g_direct_hash, g_direct_equal);
268 rtx->rtx_pt_map = g_hash_table_new (g_direct_hash, g_direct_equal);
270 rtx->max_size_time = DEFAULT_MAX_SIZE_TIME;
271 rtx->max_size_packets = DEFAULT_MAX_SIZE_PACKETS;
275 gst_rtp_rtx_send_set_flushing (GstRtpRtxSend * rtx, gboolean flush)
277 GST_OBJECT_LOCK (rtx);
278 gst_data_queue_set_flushing (rtx->queue, flush);
279 gst_data_queue_flush (rtx->queue);
280 GST_OBJECT_UNLOCK (rtx);
284 gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
285 guint visible, guint bytes, guint64 time, gpointer checkdata)
291 gst_rtp_rtx_data_queue_item_free (gpointer item)
293 GstDataQueueItem *data = item;
295 gst_mini_object_unref (data->object);
296 g_slice_free (GstDataQueueItem, data);
300 gst_rtp_rtx_send_push_out (GstRtpRtxSend * rtx, gpointer object)
302 GstDataQueueItem *data;
305 data = g_slice_new0 (GstDataQueueItem);
306 data->object = GST_MINI_OBJECT (object);
309 data->visible = TRUE;
310 data->destroy = gst_rtp_rtx_data_queue_item_free;
312 success = gst_data_queue_push (rtx->queue, data);
315 data->destroy (data);
321 gst_rtp_rtx_send_choose_ssrc (GstRtpRtxSend * rtx, guint32 choice,
322 gboolean consider_choice)
324 guint32 ssrc = consider_choice ? choice : g_random_int ();
326 /* make sure to be different than any other */
327 while (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc)) ||
328 g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
329 ssrc = g_random_int ();
336 gst_rtp_rtx_send_get_ssrc_data (GstRtpRtxSend * rtx, guint32 ssrc)
339 guint32 rtx_ssrc = 0;
340 gboolean consider = FALSE;
342 if (G_UNLIKELY (!g_hash_table_contains (rtx->ssrc_data,
343 GUINT_TO_POINTER (ssrc)))) {
344 if (rtx->external_ssrc_map) {
346 ssrc_str = g_strdup_printf ("%" G_GUINT32_FORMAT, ssrc);
347 consider = gst_structure_get_uint (rtx->external_ssrc_map, ssrc_str,
351 rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, rtx_ssrc, consider);
352 data = ssrc_rtx_data_new (rtx_ssrc);
353 g_hash_table_insert (rtx->ssrc_data, GUINT_TO_POINTER (ssrc), data);
354 g_hash_table_insert (rtx->rtx_ssrcs, GUINT_TO_POINTER (rtx_ssrc),
355 GUINT_TO_POINTER (ssrc));
357 data = g_hash_table_lookup (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
362 /* Copy fixed header and extension. Add OSN before to copy payload
363 * Copy memory to avoid to manually copy each rtp buffer field.
366 gst_rtp_rtx_buffer_new (GstRtpRtxSend * rtx, GstBuffer * buffer)
368 GstMemory *mem = NULL;
369 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
370 GstRTPBuffer new_rtp = GST_RTP_BUFFER_INIT;
371 GstBuffer *new_buffer = gst_buffer_new ();
373 guint payload_len = 0;
379 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
381 /* get needed data from GstRtpRtxSend */
382 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
383 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
384 ssrc = data->rtx_ssrc;
385 seqnum = data->next_seqnum++;
386 fmtp = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_pt_map,
387 GUINT_TO_POINTER (gst_rtp_buffer_get_payload_type (&rtp))));
389 GST_DEBUG_OBJECT (rtx,
390 "retransmit seqnum: %" G_GUINT16_FORMAT ", ssrc: %" G_GUINT32_FORMAT,
393 /* gst_rtp_buffer_map does not map the payload so do it now */
394 gst_rtp_buffer_get_payload (&rtp);
396 /* copy fixed header */
397 mem = gst_memory_copy (rtp.map[0].memory, 0, rtp.size[0]);
398 gst_buffer_append_memory (new_buffer, mem);
400 /* copy extension if any */
402 mem = gst_memory_copy (rtp.map[1].memory, 0, rtp.size[1]);
403 gst_buffer_append_memory (new_buffer, mem);
406 /* copy payload and add OSN just before */
407 payload_len = 2 + rtp.size[2];
408 mem = gst_allocator_alloc (NULL, payload_len, NULL);
410 gst_memory_map (mem, &map, GST_MAP_WRITE);
411 GST_WRITE_UINT16_BE (map.data, gst_rtp_buffer_get_seq (&rtp));
413 memcpy (map.data + 2, rtp.data[2], rtp.size[2]);
414 gst_memory_unmap (mem, &map);
415 gst_buffer_append_memory (new_buffer, mem);
417 /* everything needed is copied */
418 gst_rtp_buffer_unmap (&rtp);
420 /* set ssrc, seqnum and fmtp */
421 gst_rtp_buffer_map (new_buffer, GST_MAP_WRITE, &new_rtp);
422 gst_rtp_buffer_set_ssrc (&new_rtp, ssrc);
423 gst_rtp_buffer_set_seq (&new_rtp, seqnum);
424 gst_rtp_buffer_set_payload_type (&new_rtp, fmtp);
425 /* RFC 4588: let other elements do the padding, as normal */
426 gst_rtp_buffer_set_padding (&new_rtp, FALSE);
427 gst_rtp_buffer_unmap (&new_rtp);
433 buffer_queue_items_cmp (BufferQueueItem * a, BufferQueueItem * b,
436 /* gst_rtp_buffer_compare_seqnum returns the opposite of what we want,
437 * it returns negative when seqnum1 > seqnum2 and we want negative
438 * when b > a, i.e. a is smaller, so it comes first in the sequence */
439 return gst_rtp_buffer_compare_seqnum (b->seqnum, a->seqnum);
443 gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
445 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
448 switch (GST_EVENT_TYPE (event)) {
449 case GST_EVENT_CUSTOM_UPSTREAM:
451 const GstStructure *s = gst_event_get_structure (event);
453 /* This event usually comes from the downstream gstrtpsession */
454 if (gst_structure_has_name (s, "GstRTPRetransmissionRequest")) {
457 GstBuffer *rtx_buf = NULL;
459 /* retrieve seqnum of the packet that need to be restransmisted */
460 if (!gst_structure_get_uint (s, "seqnum", &seqnum))
463 /* retrieve ssrc of the packet that need to be restransmisted */
464 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
467 GST_DEBUG_OBJECT (rtx,
468 "request seqnum: %" G_GUINT32_FORMAT ", ssrc: %" G_GUINT32_FORMAT,
471 GST_OBJECT_LOCK (rtx);
472 /* check if request is for us */
473 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
476 BufferQueueItem search_item;
478 /* update statistics */
479 ++rtx->num_rtx_requests;
481 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
483 search_item.seqnum = seqnum;
484 iter = g_sequence_lookup (data->queue, &search_item,
485 (GCompareDataFunc) buffer_queue_items_cmp, NULL);
487 BufferQueueItem *item = g_sequence_get (iter);
488 GST_DEBUG_OBJECT (rtx, "found %" G_GUINT16_FORMAT, item->seqnum);
489 rtx_buf = gst_rtp_rtx_buffer_new (rtx, item->buffer);
492 GST_OBJECT_UNLOCK (rtx);
495 gst_rtp_rtx_send_push_out (rtx, rtx_buf);
497 gst_event_unref (event);
500 /* This event usually comes from the downstream gstrtpsession */
501 } else if (gst_structure_has_name (s, "GstRTPCollision")) {
504 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
507 GST_DEBUG_OBJECT (rtx, "collision ssrc: %" G_GUINT32_FORMAT, ssrc);
509 GST_OBJECT_LOCK (rtx);
511 /* choose another ssrc for our retransmited stream */
512 if (g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
516 master_ssrc = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_ssrcs,
517 GUINT_TO_POINTER (ssrc)));
518 data = gst_rtp_rtx_send_get_ssrc_data (rtx, master_ssrc);
520 /* change rtx_ssrc and update the reverse map */
521 data->rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, 0, FALSE);
522 g_hash_table_remove (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc));
523 g_hash_table_insert (rtx->rtx_ssrcs,
524 GUINT_TO_POINTER (data->rtx_ssrc),
525 GUINT_TO_POINTER (master_ssrc));
527 GST_OBJECT_UNLOCK (rtx);
529 /* no need to forward to payloader because we make sure to have
532 gst_event_unref (event);
535 /* if master ssrc has collided, remove it from our data, as it
536 * is not going to be used any longer */
537 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
539 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
540 g_hash_table_remove (rtx->rtx_ssrcs,
541 GUINT_TO_POINTER (data->rtx_ssrc));
542 g_hash_table_remove (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
545 GST_OBJECT_UNLOCK (rtx);
547 /* forward event to payloader in case collided ssrc is
549 res = gst_pad_event_default (pad, parent, event);
552 res = gst_pad_event_default (pad, parent, event);
557 res = gst_pad_event_default (pad, parent, event);
564 gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
566 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
568 switch (GST_EVENT_TYPE (event)) {
569 case GST_EVENT_FLUSH_START:
570 gst_pad_push_event (rtx->srcpad, event);
571 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
572 gst_pad_pause_task (rtx->srcpad);
574 case GST_EVENT_FLUSH_STOP:
575 gst_pad_push_event (rtx->srcpad, event);
576 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
577 gst_pad_start_task (rtx->srcpad,
578 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
581 GST_INFO_OBJECT (rtx, "Got EOS - enqueueing it");
582 gst_rtp_rtx_send_push_out (rtx, event);
591 gst_event_parse_caps (event, &caps);
592 g_assert (gst_caps_is_fixed (caps));
594 s = gst_caps_get_structure (caps, 0);
595 gst_structure_get_uint (s, "ssrc", &ssrc);
597 GST_OBJECT_LOCK (rtx);
598 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
599 gst_structure_get_int (s, "clock-rate", &data->clock_rate);
601 GST_DEBUG_OBJECT (rtx, "got clock-rate from caps: %d for ssrc: %u",
602 data->clock_rate, ssrc);
603 GST_OBJECT_UNLOCK (rtx);
609 return gst_pad_event_default (pad, parent, event);
612 /* like rtp_jitter_buffer_get_ts_diff() */
614 gst_rtp_rtx_send_get_ts_diff (SSRCRtxData * data)
616 guint64 high_ts, low_ts;
617 BufferQueueItem *high_buf, *low_buf;
621 g_sequence_get (g_sequence_iter_prev (g_sequence_get_end_iter
623 low_buf = g_sequence_get (g_sequence_get_begin_iter (data->queue));
625 if (!high_buf || !low_buf || high_buf == low_buf)
628 high_ts = high_buf->timestamp;
629 low_ts = low_buf->timestamp;
631 /* it needs to work if ts wraps */
632 if (high_ts >= low_ts) {
633 result = (guint32) (high_ts - low_ts);
635 result = (guint32) (high_ts + G_MAXUINT32 + 1 - low_ts);
638 /* return value in ms instead of clock ticks */
639 return (guint32) gst_util_uint64_scale_int (result, 1000, data->clock_rate);
643 gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
645 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
646 GstFlowReturn ret = GST_FLOW_ERROR;
647 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
648 BufferQueueItem *item;
652 guint32 ssrc, rtptime;
654 /* read the information we want from the buffer */
655 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
656 seqnum = gst_rtp_buffer_get_seq (&rtp);
657 payload_type = gst_rtp_buffer_get_payload_type (&rtp);
658 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
659 rtptime = gst_rtp_buffer_get_timestamp (&rtp);
660 gst_rtp_buffer_unmap (&rtp);
662 GST_OBJECT_LOCK (rtx);
664 /* do not store the buffer if it's payload type is unknown */
665 if (g_hash_table_contains (rtx->rtx_pt_map, GUINT_TO_POINTER (payload_type))) {
666 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
668 /* add current rtp buffer to queue history */
669 item = g_slice_new0 (BufferQueueItem);
670 item->seqnum = seqnum;
671 item->timestamp = rtptime;
672 item->buffer = gst_buffer_ref (buffer);
673 g_sequence_append (data->queue, item);
675 /* remove oldest packets from history if they are too many */
676 if (rtx->max_size_packets) {
677 while (g_sequence_get_length (data->queue) > rtx->max_size_packets)
678 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
680 if (rtx->max_size_time) {
681 while (gst_rtp_rtx_send_get_ts_diff (data) > rtx->max_size_time)
682 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
686 GST_OBJECT_UNLOCK (rtx);
689 "push seqnum: %" G_GUINT16_FORMAT ", ssrc: %" G_GUINT32_FORMAT, seqnum,
692 ret = gst_pad_push (rtx->srcpad, buffer);
698 gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx)
700 GstDataQueueItem *data;
702 if (gst_data_queue_pop (rtx->queue, &data)) {
703 GST_LOG_OBJECT (rtx, "pushing rtx buffer %p", data->object);
705 if (G_LIKELY (GST_IS_BUFFER (data->object))) {
706 gst_pad_push (rtx->srcpad, GST_BUFFER (data->object));
708 GST_OBJECT_LOCK (rtx);
709 rtx->num_rtx_packets++;
710 GST_OBJECT_UNLOCK (rtx);
711 } else if (GST_IS_EVENT (data->object)) {
712 gst_pad_push_event (rtx->srcpad, GST_EVENT (data->object));
714 /* after EOS, we should not send any more buffers,
715 * even if there are more requests coming in */
716 if (GST_EVENT_TYPE (data->object) == GST_EVENT_EOS) {
717 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
720 g_assert_not_reached ();
723 data->object = NULL; /* we no longer own that object */
724 data->destroy (data);
726 GST_LOG_OBJECT (rtx, "flushing");
727 gst_pad_pause_task (rtx->srcpad);
732 gst_rtp_rtx_send_activate_mode (GstPad * pad, GstObject * parent,
733 GstPadMode mode, gboolean active)
735 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
736 gboolean ret = FALSE;
739 case GST_PAD_MODE_PUSH:
741 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
742 ret = gst_pad_start_task (rtx->srcpad,
743 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
745 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
746 ret = gst_pad_stop_task (rtx->srcpad);
748 GST_INFO_OBJECT (rtx, "activate_mode: active %d, ret %d", active, ret);
757 gst_rtp_rtx_send_get_property (GObject * object,
758 guint prop_id, GValue * value, GParamSpec * pspec)
760 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
763 case PROP_PAYLOAD_TYPE_MAP:
764 GST_OBJECT_LOCK (rtx);
765 g_value_set_boxed (value, rtx->rtx_pt_map_structure);
766 GST_OBJECT_UNLOCK (rtx);
768 case PROP_MAX_SIZE_TIME:
769 GST_OBJECT_LOCK (rtx);
770 g_value_set_uint (value, rtx->max_size_time);
771 GST_OBJECT_UNLOCK (rtx);
773 case PROP_MAX_SIZE_PACKETS:
774 GST_OBJECT_LOCK (rtx);
775 g_value_set_uint (value, rtx->max_size_packets);
776 GST_OBJECT_UNLOCK (rtx);
778 case PROP_NUM_RTX_REQUESTS:
779 GST_OBJECT_LOCK (rtx);
780 g_value_set_uint (value, rtx->num_rtx_requests);
781 GST_OBJECT_UNLOCK (rtx);
783 case PROP_NUM_RTX_PACKETS:
784 GST_OBJECT_LOCK (rtx);
785 g_value_set_uint (value, rtx->num_rtx_packets);
786 GST_OBJECT_UNLOCK (rtx);
789 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
795 structure_to_hash_table (GQuark field_id, const GValue * value, gpointer hash)
797 const gchar *field_str;
801 field_str = g_quark_to_string (field_id);
802 field_uint = atoi (field_str);
803 value_uint = g_value_get_uint (value);
804 g_hash_table_insert ((GHashTable *) hash, GUINT_TO_POINTER (field_uint),
805 GUINT_TO_POINTER (value_uint));
811 gst_rtp_rtx_send_set_property (GObject * object,
812 guint prop_id, const GValue * value, GParamSpec * pspec)
814 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
818 GST_OBJECT_LOCK (rtx);
819 if (rtx->external_ssrc_map)
820 gst_structure_free (rtx->external_ssrc_map);
821 rtx->external_ssrc_map = g_value_dup_boxed (value);
822 GST_OBJECT_UNLOCK (rtx);
824 case PROP_PAYLOAD_TYPE_MAP:
825 GST_OBJECT_LOCK (rtx);
826 if (rtx->rtx_pt_map_structure)
827 gst_structure_free (rtx->rtx_pt_map_structure);
828 rtx->rtx_pt_map_structure = g_value_dup_boxed (value);
829 g_hash_table_remove_all (rtx->rtx_pt_map);
830 gst_structure_foreach (rtx->rtx_pt_map_structure, structure_to_hash_table,
832 GST_OBJECT_UNLOCK (rtx);
834 case PROP_MAX_SIZE_TIME:
835 GST_OBJECT_LOCK (rtx);
836 rtx->max_size_time = g_value_get_uint (value);
837 GST_OBJECT_UNLOCK (rtx);
839 case PROP_MAX_SIZE_PACKETS:
840 GST_OBJECT_LOCK (rtx);
841 rtx->max_size_packets = g_value_get_uint (value);
842 GST_OBJECT_UNLOCK (rtx);
845 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
850 static GstStateChangeReturn
851 gst_rtp_rtx_send_change_state (GstElement * element, GstStateChange transition)
853 GstStateChangeReturn ret;
856 rtx = GST_RTP_RTX_SEND (element);
858 switch (transition) {
864 GST_ELEMENT_CLASS (gst_rtp_rtx_send_parent_class)->change_state (element,
867 switch (transition) {
868 case GST_STATE_CHANGE_PAUSED_TO_READY:
869 gst_rtp_rtx_send_reset (rtx);
879 gst_rtp_rtx_send_plugin_init (GstPlugin * plugin)
881 GST_DEBUG_CATEGORY_INIT (gst_rtp_rtx_send_debug, "rtprtxsend", 0,
882 "rtp retransmission sender");
884 return gst_element_register (plugin, "rtprtxsend", GST_RANK_NONE,
885 GST_TYPE_RTP_RTX_SEND);