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
28 * See #GstRtpRtxReceive for examples
30 * The purpose of the sender RTX object is to keep a history of RTP packets up
31 * to a configurable limit (max-size-time or max-size-packets). It will listen
32 * for upstream custom retransmission events (GstRTPRetransmissionRequest) that
33 * comes from downstream (#GstRtpSession). When receiving a request it will
34 * look up the requested seqnum in its list of stored packets. If the packet
35 * is available, it will create a RTX packet according to RFC 4588 and send
36 * this as an auxiliary stream. RTX is SSRC-multiplexed
44 #include <gst/rtp/gstrtpbuffer.h>
48 #include "gstrtprtxsend.h"
50 GST_DEBUG_CATEGORY_STATIC (gst_rtp_rtx_send_debug);
51 #define GST_CAT_DEFAULT gst_rtp_rtx_send_debug
53 #define DEFAULT_RTX_PAYLOAD_TYPE 0
54 #define DEFAULT_MAX_SIZE_TIME 0
55 #define DEFAULT_MAX_SIZE_PACKETS 100
61 PROP_PAYLOAD_TYPE_MAP,
63 PROP_MAX_SIZE_PACKETS,
64 PROP_NUM_RTX_REQUESTS,
69 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
72 GST_STATIC_CAPS ("application/x-rtp")
75 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
78 GST_STATIC_CAPS ("application/x-rtp")
81 static gboolean gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
82 guint visible, guint bytes, guint64 time, gpointer checkdata);
84 static gboolean gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent,
86 static gboolean gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent,
88 static GstFlowReturn gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent,
90 static GstFlowReturn gst_rtp_rtx_send_chain_list (GstPad * pad,
91 GstObject * parent, GstBufferList * list);
93 static void gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx);
94 static gboolean gst_rtp_rtx_send_activate_mode (GstPad * pad,
95 GstObject * parent, GstPadMode mode, gboolean active);
97 static GstStateChangeReturn gst_rtp_rtx_send_change_state (GstElement *
98 element, GstStateChange transition);
100 static void gst_rtp_rtx_send_set_property (GObject * object, guint prop_id,
101 const GValue * value, GParamSpec * pspec);
102 static void gst_rtp_rtx_send_get_property (GObject * object, guint prop_id,
103 GValue * value, GParamSpec * pspec);
104 static void gst_rtp_rtx_send_finalize (GObject * object);
106 G_DEFINE_TYPE (GstRtpRtxSend, gst_rtp_rtx_send, GST_TYPE_ELEMENT);
116 buffer_queue_item_free (BufferQueueItem * item)
118 gst_buffer_unref (item->buffer);
119 g_slice_free (BufferQueueItem, item);
125 guint16 seqnum_base, next_seqnum;
128 /* history of rtp packets */
133 ssrc_rtx_data_new (guint32 rtx_ssrc)
135 SSRCRtxData *data = g_slice_new0 (SSRCRtxData);
137 data->rtx_ssrc = rtx_ssrc;
138 data->next_seqnum = data->seqnum_base = g_random_int_range (0, G_MAXUINT16);
139 data->queue = g_sequence_new ((GDestroyNotify) buffer_queue_item_free);
145 ssrc_rtx_data_free (SSRCRtxData * data)
147 g_sequence_free (data->queue);
148 g_slice_free (SSRCRtxData, data);
152 gst_rtp_rtx_send_class_init (GstRtpRtxSendClass * klass)
154 GObjectClass *gobject_class;
155 GstElementClass *gstelement_class;
157 gobject_class = (GObjectClass *) klass;
158 gstelement_class = (GstElementClass *) klass;
160 gobject_class->get_property = gst_rtp_rtx_send_get_property;
161 gobject_class->set_property = gst_rtp_rtx_send_set_property;
162 gobject_class->finalize = gst_rtp_rtx_send_finalize;
164 g_object_class_install_property (gobject_class, PROP_SSRC_MAP,
165 g_param_spec_boxed ("ssrc-map", "SSRC Map",
166 "Map of SSRCs to their retransmission SSRCs for SSRC-multiplexed mode"
167 " (default = random)", GST_TYPE_STRUCTURE,
168 G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
170 g_object_class_install_property (gobject_class, PROP_PAYLOAD_TYPE_MAP,
171 g_param_spec_boxed ("payload-type-map", "Payload Type Map",
172 "Map of original payload types to their retransmission payload types",
173 GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
175 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
176 g_param_spec_uint ("max-size-time", "Max Size Time",
177 "Amount of ms to queue (0 = unlimited)", 0, G_MAXUINT,
178 DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
180 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_PACKETS,
181 g_param_spec_uint ("max-size-packets", "Max Size Packets",
182 "Amount of packets to queue (0 = unlimited)", 0, G_MAXINT16,
183 DEFAULT_MAX_SIZE_PACKETS,
184 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
186 g_object_class_install_property (gobject_class, PROP_NUM_RTX_REQUESTS,
187 g_param_spec_uint ("num-rtx-requests", "Num RTX Requests",
188 "Number of retransmission events received", 0, G_MAXUINT,
189 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
191 g_object_class_install_property (gobject_class, PROP_NUM_RTX_PACKETS,
192 g_param_spec_uint ("num-rtx-packets", "Num RTX Packets",
193 " Number of retransmission packets sent", 0, G_MAXUINT,
194 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
196 g_object_class_install_property (gobject_class, PROP_CLOCK_RATE_MAP,
197 g_param_spec_boxed ("clock-rate-map", "Clock Rate Map",
198 "Map of payload types to their clock rates",
199 GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
201 gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
202 gst_element_class_add_static_pad_template (gstelement_class, &sink_factory);
204 gst_element_class_set_static_metadata (gstelement_class,
205 "RTP Retransmission Sender", "Codec",
206 "Retransmit RTP packets when needed, according to RFC4588",
207 "Julien Isorce <julien.isorce@collabora.co.uk>");
209 gstelement_class->change_state =
210 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_change_state);
214 gst_rtp_rtx_send_reset (GstRtpRtxSend * rtx)
216 GST_OBJECT_LOCK (rtx);
217 gst_data_queue_flush (rtx->queue);
218 g_hash_table_remove_all (rtx->ssrc_data);
219 g_hash_table_remove_all (rtx->rtx_ssrcs);
220 rtx->num_rtx_requests = 0;
221 rtx->num_rtx_packets = 0;
222 GST_OBJECT_UNLOCK (rtx);
226 gst_rtp_rtx_send_finalize (GObject * object)
228 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
230 g_hash_table_unref (rtx->ssrc_data);
231 g_hash_table_unref (rtx->rtx_ssrcs);
232 if (rtx->external_ssrc_map)
233 gst_structure_free (rtx->external_ssrc_map);
234 g_hash_table_unref (rtx->rtx_pt_map);
235 if (rtx->rtx_pt_map_structure)
236 gst_structure_free (rtx->rtx_pt_map_structure);
237 g_hash_table_unref (rtx->clock_rate_map);
238 if (rtx->clock_rate_map_structure)
239 gst_structure_free (rtx->clock_rate_map_structure);
240 g_object_unref (rtx->queue);
242 G_OBJECT_CLASS (gst_rtp_rtx_send_parent_class)->finalize (object);
246 gst_rtp_rtx_send_init (GstRtpRtxSend * rtx)
248 GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtx);
251 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
253 GST_PAD_SET_PROXY_CAPS (rtx->srcpad);
254 GST_PAD_SET_PROXY_ALLOCATION (rtx->srcpad);
255 gst_pad_set_event_function (rtx->srcpad,
256 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_src_event));
257 gst_pad_set_activatemode_function (rtx->srcpad,
258 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_activate_mode));
259 gst_element_add_pad (GST_ELEMENT (rtx), rtx->srcpad);
262 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
264 GST_PAD_SET_PROXY_CAPS (rtx->sinkpad);
265 GST_PAD_SET_PROXY_ALLOCATION (rtx->sinkpad);
266 gst_pad_set_event_function (rtx->sinkpad,
267 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_sink_event));
268 gst_pad_set_chain_function (rtx->sinkpad,
269 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain));
270 gst_pad_set_chain_list_function (rtx->sinkpad,
271 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain_list));
272 gst_element_add_pad (GST_ELEMENT (rtx), rtx->sinkpad);
274 rtx->queue = gst_data_queue_new (gst_rtp_rtx_send_queue_check_full, NULL,
276 rtx->ssrc_data = g_hash_table_new_full (g_direct_hash, g_direct_equal,
277 NULL, (GDestroyNotify) ssrc_rtx_data_free);
278 rtx->rtx_ssrcs = g_hash_table_new (g_direct_hash, g_direct_equal);
279 rtx->rtx_pt_map = g_hash_table_new (g_direct_hash, g_direct_equal);
280 rtx->clock_rate_map = g_hash_table_new (g_direct_hash, g_direct_equal);
282 rtx->max_size_time = DEFAULT_MAX_SIZE_TIME;
283 rtx->max_size_packets = DEFAULT_MAX_SIZE_PACKETS;
287 gst_rtp_rtx_send_set_flushing (GstRtpRtxSend * rtx, gboolean flush)
289 GST_OBJECT_LOCK (rtx);
290 gst_data_queue_set_flushing (rtx->queue, flush);
291 gst_data_queue_flush (rtx->queue);
292 GST_OBJECT_UNLOCK (rtx);
296 gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
297 guint visible, guint bytes, guint64 time, gpointer checkdata)
303 gst_rtp_rtx_data_queue_item_free (gpointer item)
305 GstDataQueueItem *data = item;
307 gst_mini_object_unref (data->object);
308 g_slice_free (GstDataQueueItem, data);
312 gst_rtp_rtx_send_push_out (GstRtpRtxSend * rtx, gpointer object)
314 GstDataQueueItem *data;
317 data = g_slice_new0 (GstDataQueueItem);
318 data->object = GST_MINI_OBJECT (object);
321 data->visible = TRUE;
322 data->destroy = gst_rtp_rtx_data_queue_item_free;
324 success = gst_data_queue_push (rtx->queue, data);
327 data->destroy (data);
333 gst_rtp_rtx_send_choose_ssrc (GstRtpRtxSend * rtx, guint32 choice,
334 gboolean consider_choice)
336 guint32 ssrc = consider_choice ? choice : g_random_int ();
338 /* make sure to be different than any other */
339 while (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc)) ||
340 g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
341 ssrc = g_random_int ();
348 gst_rtp_rtx_send_get_ssrc_data (GstRtpRtxSend * rtx, guint32 ssrc)
351 guint32 rtx_ssrc = 0;
352 gboolean consider = FALSE;
354 if (G_UNLIKELY (!g_hash_table_contains (rtx->ssrc_data,
355 GUINT_TO_POINTER (ssrc)))) {
356 if (rtx->external_ssrc_map) {
358 ssrc_str = g_strdup_printf ("%" G_GUINT32_FORMAT, ssrc);
359 consider = gst_structure_get_uint (rtx->external_ssrc_map, ssrc_str,
363 rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, rtx_ssrc, consider);
364 data = ssrc_rtx_data_new (rtx_ssrc);
365 g_hash_table_insert (rtx->ssrc_data, GUINT_TO_POINTER (ssrc), data);
366 g_hash_table_insert (rtx->rtx_ssrcs, GUINT_TO_POINTER (rtx_ssrc),
367 GUINT_TO_POINTER (ssrc));
369 data = g_hash_table_lookup (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
374 /* Copy fixed header and extension. Add OSN before to copy payload
375 * Copy memory to avoid to manually copy each rtp buffer field.
378 gst_rtp_rtx_buffer_new (GstRtpRtxSend * rtx, GstBuffer * buffer)
380 GstMemory *mem = NULL;
381 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
382 GstRTPBuffer new_rtp = GST_RTP_BUFFER_INIT;
383 GstBuffer *new_buffer = gst_buffer_new ();
385 guint payload_len = 0;
391 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
393 /* get needed data from GstRtpRtxSend */
394 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
395 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
396 ssrc = data->rtx_ssrc;
397 seqnum = data->next_seqnum++;
398 fmtp = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_pt_map,
399 GUINT_TO_POINTER (gst_rtp_buffer_get_payload_type (&rtp))));
401 GST_DEBUG_OBJECT (rtx, "creating rtx buffer, orig seqnum: %u, "
402 "rtx seqnum: %u, rtx ssrc: %X", gst_rtp_buffer_get_seq (&rtp),
405 /* gst_rtp_buffer_map does not map the payload so do it now */
406 gst_rtp_buffer_get_payload (&rtp);
408 /* copy fixed header */
409 mem = gst_memory_copy (rtp.map[0].memory, 0, rtp.size[0]);
410 gst_buffer_append_memory (new_buffer, mem);
412 /* copy extension if any */
414 mem = gst_allocator_alloc (NULL, rtp.size[1], NULL);
415 gst_memory_map (mem, &map, GST_MAP_WRITE);
416 memcpy (map.data, rtp.data[1], rtp.size[1]);
417 gst_memory_unmap (mem, &map);
418 gst_buffer_append_memory (new_buffer, mem);
421 /* copy payload and add OSN just before */
422 payload_len = 2 + rtp.size[2];
423 mem = gst_allocator_alloc (NULL, payload_len, NULL);
425 gst_memory_map (mem, &map, GST_MAP_WRITE);
426 GST_WRITE_UINT16_BE (map.data, gst_rtp_buffer_get_seq (&rtp));
428 memcpy (map.data + 2, rtp.data[2], rtp.size[2]);
429 gst_memory_unmap (mem, &map);
430 gst_buffer_append_memory (new_buffer, mem);
432 /* everything needed is copied */
433 gst_rtp_buffer_unmap (&rtp);
435 /* set ssrc, seqnum and fmtp */
436 gst_rtp_buffer_map (new_buffer, GST_MAP_WRITE, &new_rtp);
437 gst_rtp_buffer_set_ssrc (&new_rtp, ssrc);
438 gst_rtp_buffer_set_seq (&new_rtp, seqnum);
439 gst_rtp_buffer_set_payload_type (&new_rtp, fmtp);
440 /* RFC 4588: let other elements do the padding, as normal */
441 gst_rtp_buffer_set_padding (&new_rtp, FALSE);
442 gst_rtp_buffer_unmap (&new_rtp);
444 /* Copy over timestamps */
445 gst_buffer_copy_into (new_buffer, buffer, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
451 buffer_queue_items_cmp (BufferQueueItem * a, BufferQueueItem * b,
454 /* gst_rtp_buffer_compare_seqnum returns the opposite of what we want,
455 * it returns negative when seqnum1 > seqnum2 and we want negative
456 * when b > a, i.e. a is smaller, so it comes first in the sequence */
457 return gst_rtp_buffer_compare_seqnum (b->seqnum, a->seqnum);
461 gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
463 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
466 switch (GST_EVENT_TYPE (event)) {
467 case GST_EVENT_CUSTOM_UPSTREAM:
469 const GstStructure *s = gst_event_get_structure (event);
471 /* This event usually comes from the downstream gstrtpsession */
472 if (gst_structure_has_name (s, "GstRTPRetransmissionRequest")) {
475 GstBuffer *rtx_buf = NULL;
477 /* retrieve seqnum of the packet that need to be retransmitted */
478 if (!gst_structure_get_uint (s, "seqnum", &seqnum))
481 /* retrieve ssrc of the packet that need to be retransmitted */
482 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
485 GST_DEBUG_OBJECT (rtx, "got rtx request for seqnum: %u, ssrc: %X",
488 GST_OBJECT_LOCK (rtx);
489 /* check if request is for us */
490 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
493 BufferQueueItem search_item;
495 /* update statistics */
496 ++rtx->num_rtx_requests;
498 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
500 search_item.seqnum = seqnum;
501 iter = g_sequence_lookup (data->queue, &search_item,
502 (GCompareDataFunc) buffer_queue_items_cmp, NULL);
504 BufferQueueItem *item = g_sequence_get (iter);
505 GST_LOG_OBJECT (rtx, "found %u", item->seqnum);
506 rtx_buf = gst_rtp_rtx_buffer_new (rtx, item->buffer);
508 #ifndef GST_DISABLE_DEBUG
510 BufferQueueItem *item = NULL;
512 iter = g_sequence_get_begin_iter (data->queue);
513 if (!g_sequence_iter_is_end (iter))
514 item = g_sequence_get (iter);
516 if (item && seqnum < item->seqnum) {
517 GST_DEBUG_OBJECT (rtx, "requested seqnum %u has already been "
518 "removed from the rtx queue; the first available is %u",
519 seqnum, item->seqnum);
521 GST_WARNING_OBJECT (rtx, "requested seqnum %u has not been "
522 "transmitted yet in the original stream; either the remote end "
523 "is not configured correctly, or the source is too slow",
529 GST_OBJECT_UNLOCK (rtx);
532 gst_rtp_rtx_send_push_out (rtx, rtx_buf);
534 gst_event_unref (event);
537 /* This event usually comes from the downstream gstrtpsession */
538 } else if (gst_structure_has_name (s, "GstRTPCollision")) {
541 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
544 GST_DEBUG_OBJECT (rtx, "got ssrc collision, ssrc: %X", ssrc);
546 GST_OBJECT_LOCK (rtx);
548 /* choose another ssrc for our retransmitted stream */
549 if (g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
553 master_ssrc = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_ssrcs,
554 GUINT_TO_POINTER (ssrc)));
555 data = gst_rtp_rtx_send_get_ssrc_data (rtx, master_ssrc);
557 /* change rtx_ssrc and update the reverse map */
558 data->rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, 0, FALSE);
559 g_hash_table_remove (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc));
560 g_hash_table_insert (rtx->rtx_ssrcs,
561 GUINT_TO_POINTER (data->rtx_ssrc),
562 GUINT_TO_POINTER (master_ssrc));
564 GST_OBJECT_UNLOCK (rtx);
566 /* no need to forward to payloader because we make sure to have
569 gst_event_unref (event);
572 /* if master ssrc has collided, remove it from our data, as it
573 * is not going to be used any longer */
574 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
576 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
577 g_hash_table_remove (rtx->rtx_ssrcs,
578 GUINT_TO_POINTER (data->rtx_ssrc));
579 g_hash_table_remove (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
582 GST_OBJECT_UNLOCK (rtx);
584 /* forward event to payloader in case collided ssrc is
586 res = gst_pad_event_default (pad, parent, event);
589 res = gst_pad_event_default (pad, parent, event);
594 res = gst_pad_event_default (pad, parent, event);
601 gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
603 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
605 switch (GST_EVENT_TYPE (event)) {
606 case GST_EVENT_FLUSH_START:
607 gst_pad_push_event (rtx->srcpad, event);
608 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
609 gst_pad_pause_task (rtx->srcpad);
611 case GST_EVENT_FLUSH_STOP:
612 gst_pad_push_event (rtx->srcpad, event);
613 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
614 gst_pad_start_task (rtx->srcpad,
615 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
618 GST_INFO_OBJECT (rtx, "Got EOS - enqueueing it");
619 gst_rtp_rtx_send_push_out (rtx, event);
627 gpointer rtx_payload;
630 gst_event_parse_caps (event, &caps);
632 s = gst_caps_get_structure (caps, 0);
633 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
635 if (!gst_structure_get_int (s, "payload", &payload))
638 if (payload == -1 || ssrc == G_MAXUINT)
642 GST_WARNING_OBJECT (rtx, "No payload in caps");
644 GST_OBJECT_LOCK (rtx);
645 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
646 if (!g_hash_table_lookup_extended (rtx->rtx_pt_map,
647 GUINT_TO_POINTER (payload), NULL, &rtx_payload))
648 rtx_payload = GINT_TO_POINTER (-1);
650 if (GPOINTER_TO_INT (rtx_payload) == -1 && payload != -1)
651 GST_WARNING_OBJECT (rtx, "Payload %d not in rtx-pt-map", payload);
653 GST_DEBUG_OBJECT (rtx,
654 "got caps for payload: %d->%d, ssrc: %u->%u : %" GST_PTR_FORMAT,
655 payload, GPOINTER_TO_INT (rtx_payload), ssrc, data->rtx_ssrc, caps);
657 gst_structure_get_int (s, "clock-rate", &data->clock_rate);
659 /* The session might need to know the RTX ssrc */
660 caps = gst_caps_copy (caps);
661 gst_caps_set_simple (caps, "rtx-ssrc", G_TYPE_UINT, data->rtx_ssrc,
662 "rtx-seqnum-offset", G_TYPE_UINT, data->seqnum_base, NULL);
664 if (GPOINTER_TO_INT (rtx_payload) != -1)
665 gst_caps_set_simple (caps, "rtx-payload", G_TYPE_INT,
666 GPOINTER_TO_INT (rtx_payload), NULL);
668 GST_DEBUG_OBJECT (rtx, "got clock-rate from caps: %d for ssrc: %u",
669 data->clock_rate, ssrc);
670 GST_OBJECT_UNLOCK (rtx);
672 gst_event_unref (event);
673 event = gst_event_new_caps (caps);
674 gst_caps_unref (caps);
680 return gst_pad_event_default (pad, parent, event);
683 /* like rtp_jitter_buffer_get_ts_diff() */
685 gst_rtp_rtx_send_get_ts_diff (SSRCRtxData * data)
687 guint64 high_ts, low_ts;
688 BufferQueueItem *high_buf, *low_buf;
692 g_sequence_get (g_sequence_iter_prev (g_sequence_get_end_iter
694 low_buf = g_sequence_get (g_sequence_get_begin_iter (data->queue));
696 if (!high_buf || !low_buf || high_buf == low_buf)
699 high_ts = high_buf->timestamp;
700 low_ts = low_buf->timestamp;
702 /* it needs to work if ts wraps */
703 if (high_ts >= low_ts) {
704 result = (guint32) (high_ts - low_ts);
706 result = (guint32) (high_ts + G_MAXUINT32 + 1 - low_ts);
709 /* return value in ms instead of clock ticks */
710 return (guint32) gst_util_uint64_scale_int (result, 1000, data->clock_rate);
713 /* Must be called with lock */
715 process_buffer (GstRtpRtxSend * rtx, GstBuffer * buffer)
717 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
718 BufferQueueItem *item;
722 guint32 ssrc, rtptime;
724 /* read the information we want from the buffer */
725 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
726 seqnum = gst_rtp_buffer_get_seq (&rtp);
727 payload_type = gst_rtp_buffer_get_payload_type (&rtp);
728 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
729 rtptime = gst_rtp_buffer_get_timestamp (&rtp);
730 gst_rtp_buffer_unmap (&rtp);
732 GST_TRACE_OBJECT (rtx, "Processing buffer seqnum: %u, ssrc: %X", seqnum,
735 /* do not store the buffer if it's payload type is unknown */
736 if (g_hash_table_contains (rtx->rtx_pt_map, GUINT_TO_POINTER (payload_type))) {
737 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
739 if (data->clock_rate == 0 && rtx->clock_rate_map_structure) {
741 GPOINTER_TO_INT (g_hash_table_lookup (rtx->clock_rate_map,
742 GUINT_TO_POINTER (payload_type)));
745 /* add current rtp buffer to queue history */
746 item = g_slice_new0 (BufferQueueItem);
747 item->seqnum = seqnum;
748 item->timestamp = rtptime;
749 item->buffer = gst_buffer_ref (buffer);
750 g_sequence_append (data->queue, item);
752 /* remove oldest packets from history if they are too many */
753 if (rtx->max_size_packets) {
754 while (g_sequence_get_length (data->queue) > rtx->max_size_packets)
755 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
757 if (rtx->max_size_time) {
758 while (gst_rtp_rtx_send_get_ts_diff (data) > rtx->max_size_time)
759 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
765 gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
767 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
770 GST_OBJECT_LOCK (rtx);
771 process_buffer (rtx, buffer);
772 GST_OBJECT_UNLOCK (rtx);
773 ret = gst_pad_push (rtx->srcpad, buffer);
779 process_buffer_from_list (GstBuffer ** buffer, guint idx, gpointer user_data)
781 process_buffer (user_data, *buffer);
786 gst_rtp_rtx_send_chain_list (GstPad * pad, GstObject * parent,
787 GstBufferList * list)
789 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
792 GST_OBJECT_LOCK (rtx);
793 gst_buffer_list_foreach (list, process_buffer_from_list, rtx);
794 GST_OBJECT_UNLOCK (rtx);
796 ret = gst_pad_push_list (rtx->srcpad, list);
802 gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx)
804 GstDataQueueItem *data;
806 if (gst_data_queue_pop (rtx->queue, &data)) {
807 GST_LOG_OBJECT (rtx, "pushing rtx buffer %p", data->object);
809 if (G_LIKELY (GST_IS_BUFFER (data->object))) {
810 GST_OBJECT_LOCK (rtx);
811 /* Update statistics just before pushing. */
812 rtx->num_rtx_packets++;
813 GST_OBJECT_UNLOCK (rtx);
815 gst_pad_push (rtx->srcpad, GST_BUFFER (data->object));
816 } else if (GST_IS_EVENT (data->object)) {
817 gst_pad_push_event (rtx->srcpad, GST_EVENT (data->object));
819 /* after EOS, we should not send any more buffers,
820 * even if there are more requests coming in */
821 if (GST_EVENT_TYPE (data->object) == GST_EVENT_EOS) {
822 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
825 g_assert_not_reached ();
828 data->object = NULL; /* we no longer own that object */
829 data->destroy (data);
831 GST_LOG_OBJECT (rtx, "flushing");
832 gst_pad_pause_task (rtx->srcpad);
837 gst_rtp_rtx_send_activate_mode (GstPad * pad, GstObject * parent,
838 GstPadMode mode, gboolean active)
840 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
841 gboolean ret = FALSE;
844 case GST_PAD_MODE_PUSH:
846 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
847 ret = gst_pad_start_task (rtx->srcpad,
848 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
850 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
851 ret = gst_pad_stop_task (rtx->srcpad);
853 GST_INFO_OBJECT (rtx, "activate_mode: active %d, ret %d", active, ret);
862 gst_rtp_rtx_send_get_property (GObject * object,
863 guint prop_id, GValue * value, GParamSpec * pspec)
865 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
868 case PROP_PAYLOAD_TYPE_MAP:
869 GST_OBJECT_LOCK (rtx);
870 g_value_set_boxed (value, rtx->rtx_pt_map_structure);
871 GST_OBJECT_UNLOCK (rtx);
873 case PROP_MAX_SIZE_TIME:
874 GST_OBJECT_LOCK (rtx);
875 g_value_set_uint (value, rtx->max_size_time);
876 GST_OBJECT_UNLOCK (rtx);
878 case PROP_MAX_SIZE_PACKETS:
879 GST_OBJECT_LOCK (rtx);
880 g_value_set_uint (value, rtx->max_size_packets);
881 GST_OBJECT_UNLOCK (rtx);
883 case PROP_NUM_RTX_REQUESTS:
884 GST_OBJECT_LOCK (rtx);
885 g_value_set_uint (value, rtx->num_rtx_requests);
886 GST_OBJECT_UNLOCK (rtx);
888 case PROP_NUM_RTX_PACKETS:
889 GST_OBJECT_LOCK (rtx);
890 g_value_set_uint (value, rtx->num_rtx_packets);
891 GST_OBJECT_UNLOCK (rtx);
893 case PROP_CLOCK_RATE_MAP:
894 GST_OBJECT_LOCK (rtx);
895 g_value_set_boxed (value, rtx->clock_rate_map_structure);
896 GST_OBJECT_UNLOCK (rtx);
899 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
905 structure_to_hash_table (GQuark field_id, const GValue * value, gpointer hash)
907 const gchar *field_str;
911 field_str = g_quark_to_string (field_id);
912 field_uint = atoi (field_str);
913 value_uint = g_value_get_uint (value);
914 g_hash_table_insert ((GHashTable *) hash, GUINT_TO_POINTER (field_uint),
915 GUINT_TO_POINTER (value_uint));
921 gst_rtp_rtx_send_set_property (GObject * object,
922 guint prop_id, const GValue * value, GParamSpec * pspec)
924 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
928 GST_OBJECT_LOCK (rtx);
929 if (rtx->external_ssrc_map)
930 gst_structure_free (rtx->external_ssrc_map);
931 rtx->external_ssrc_map = g_value_dup_boxed (value);
932 GST_OBJECT_UNLOCK (rtx);
934 case PROP_PAYLOAD_TYPE_MAP:
935 GST_OBJECT_LOCK (rtx);
936 if (rtx->rtx_pt_map_structure)
937 gst_structure_free (rtx->rtx_pt_map_structure);
938 rtx->rtx_pt_map_structure = g_value_dup_boxed (value);
939 g_hash_table_remove_all (rtx->rtx_pt_map);
940 gst_structure_foreach (rtx->rtx_pt_map_structure, structure_to_hash_table,
942 GST_OBJECT_UNLOCK (rtx);
944 case PROP_MAX_SIZE_TIME:
945 GST_OBJECT_LOCK (rtx);
946 rtx->max_size_time = g_value_get_uint (value);
947 GST_OBJECT_UNLOCK (rtx);
949 case PROP_MAX_SIZE_PACKETS:
950 GST_OBJECT_LOCK (rtx);
951 rtx->max_size_packets = g_value_get_uint (value);
952 GST_OBJECT_UNLOCK (rtx);
954 case PROP_CLOCK_RATE_MAP:
955 GST_OBJECT_LOCK (rtx);
956 if (rtx->clock_rate_map_structure)
957 gst_structure_free (rtx->clock_rate_map_structure);
958 rtx->clock_rate_map_structure = g_value_dup_boxed (value);
959 g_hash_table_remove_all (rtx->clock_rate_map);
960 gst_structure_foreach (rtx->clock_rate_map_structure,
961 structure_to_hash_table, rtx->clock_rate_map);
962 GST_OBJECT_UNLOCK (rtx);
965 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
970 static GstStateChangeReturn
971 gst_rtp_rtx_send_change_state (GstElement * element, GstStateChange transition)
973 GstStateChangeReturn ret;
976 rtx = GST_RTP_RTX_SEND (element);
978 switch (transition) {
984 GST_ELEMENT_CLASS (gst_rtp_rtx_send_parent_class)->change_state (element,
987 switch (transition) {
988 case GST_STATE_CHANGE_PAUSED_TO_READY:
989 gst_rtp_rtx_send_reset (rtx);
999 gst_rtp_rtx_send_plugin_init (GstPlugin * plugin)
1001 GST_DEBUG_CATEGORY_INIT (gst_rtp_rtx_send_debug, "rtprtxsend", 0,
1002 "rtp retransmission sender");
1004 return gst_element_register (plugin, "rtprtxsend", GST_RANK_NONE,
1005 GST_TYPE_RTP_RTX_SEND);