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, " "clock-rate = (int) [1, MAX]")
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,
89 static GstFlowReturn gst_rtp_rtx_send_chain_list (GstPad * pad,
90 GstObject * parent, GstBufferList * list);
92 static void gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx);
93 static gboolean gst_rtp_rtx_send_activate_mode (GstPad * pad,
94 GstObject * parent, GstPadMode mode, gboolean active);
96 static GstStateChangeReturn gst_rtp_rtx_send_change_state (GstElement *
97 element, GstStateChange transition);
99 static void gst_rtp_rtx_send_set_property (GObject * object, guint prop_id,
100 const GValue * value, GParamSpec * pspec);
101 static void gst_rtp_rtx_send_get_property (GObject * object, guint prop_id,
102 GValue * value, GParamSpec * pspec);
103 static void gst_rtp_rtx_send_finalize (GObject * object);
105 G_DEFINE_TYPE (GstRtpRtxSend, gst_rtp_rtx_send, GST_TYPE_ELEMENT);
115 buffer_queue_item_free (BufferQueueItem * item)
117 gst_buffer_unref (item->buffer);
118 g_slice_free (BufferQueueItem, item);
124 guint16 seqnum_base, next_seqnum;
127 /* history of rtp packets */
132 ssrc_rtx_data_new (guint32 rtx_ssrc)
134 SSRCRtxData *data = g_slice_new0 (SSRCRtxData);
136 data->rtx_ssrc = rtx_ssrc;
137 data->next_seqnum = data->seqnum_base = g_random_int_range (0, G_MAXUINT16);
138 data->queue = g_sequence_new ((GDestroyNotify) buffer_queue_item_free);
144 ssrc_rtx_data_free (SSRCRtxData * data)
146 g_sequence_free (data->queue);
147 g_slice_free (SSRCRtxData, data);
151 gst_rtp_rtx_send_class_init (GstRtpRtxSendClass * klass)
153 GObjectClass *gobject_class;
154 GstElementClass *gstelement_class;
156 gobject_class = (GObjectClass *) klass;
157 gstelement_class = (GstElementClass *) klass;
159 gobject_class->get_property = gst_rtp_rtx_send_get_property;
160 gobject_class->set_property = gst_rtp_rtx_send_set_property;
161 gobject_class->finalize = gst_rtp_rtx_send_finalize;
163 g_object_class_install_property (gobject_class, PROP_SSRC_MAP,
164 g_param_spec_boxed ("ssrc-map", "SSRC Map",
165 "Map of SSRCs to their retransmission SSRCs for SSRC-multiplexed mode"
166 " (default = random)", GST_TYPE_STRUCTURE,
167 G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
169 g_object_class_install_property (gobject_class, PROP_PAYLOAD_TYPE_MAP,
170 g_param_spec_boxed ("payload-type-map", "Payload Type Map",
171 "Map of original payload types to their retransmission payload types",
172 GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
174 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
175 g_param_spec_uint ("max-size-time", "Max Size Time",
176 "Amount of ms to queue (0 = unlimited)", 0, G_MAXUINT,
177 DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
179 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_PACKETS,
180 g_param_spec_uint ("max-size-packets", "Max Size Packets",
181 "Amount of packets to queue (0 = unlimited)", 0, G_MAXINT16,
182 DEFAULT_MAX_SIZE_PACKETS,
183 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
185 g_object_class_install_property (gobject_class, PROP_NUM_RTX_REQUESTS,
186 g_param_spec_uint ("num-rtx-requests", "Num RTX Requests",
187 "Number of retransmission events received", 0, G_MAXUINT,
188 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
190 g_object_class_install_property (gobject_class, PROP_NUM_RTX_PACKETS,
191 g_param_spec_uint ("num-rtx-packets", "Num RTX Packets",
192 " Number of retransmission packets sent", 0, G_MAXUINT,
193 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
195 gst_element_class_add_pad_template (gstelement_class,
196 gst_static_pad_template_get (&src_factory));
197 gst_element_class_add_pad_template (gstelement_class,
198 gst_static_pad_template_get (&sink_factory));
200 gst_element_class_set_static_metadata (gstelement_class,
201 "RTP Retransmission Sender", "Codec",
202 "Retransmit RTP packets when needed, according to RFC4588",
203 "Julien Isorce <julien.isorce@collabora.co.uk>");
205 gstelement_class->change_state =
206 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_change_state);
210 gst_rtp_rtx_send_reset (GstRtpRtxSend * rtx)
212 GST_OBJECT_LOCK (rtx);
213 gst_data_queue_flush (rtx->queue);
214 g_hash_table_remove_all (rtx->ssrc_data);
215 g_hash_table_remove_all (rtx->rtx_ssrcs);
216 rtx->num_rtx_requests = 0;
217 rtx->num_rtx_packets = 0;
218 GST_OBJECT_UNLOCK (rtx);
222 gst_rtp_rtx_send_finalize (GObject * object)
224 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
226 g_hash_table_unref (rtx->ssrc_data);
227 g_hash_table_unref (rtx->rtx_ssrcs);
228 if (rtx->external_ssrc_map)
229 gst_structure_free (rtx->external_ssrc_map);
230 g_hash_table_unref (rtx->rtx_pt_map);
231 if (rtx->rtx_pt_map_structure)
232 gst_structure_free (rtx->rtx_pt_map_structure);
233 g_object_unref (rtx->queue);
235 G_OBJECT_CLASS (gst_rtp_rtx_send_parent_class)->finalize (object);
239 gst_rtp_rtx_send_init (GstRtpRtxSend * rtx)
241 GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtx);
244 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
246 GST_PAD_SET_PROXY_CAPS (rtx->srcpad);
247 GST_PAD_SET_PROXY_ALLOCATION (rtx->srcpad);
248 gst_pad_set_event_function (rtx->srcpad,
249 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_src_event));
250 gst_pad_set_activatemode_function (rtx->srcpad,
251 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_activate_mode));
252 gst_element_add_pad (GST_ELEMENT (rtx), rtx->srcpad);
255 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
257 GST_PAD_SET_PROXY_CAPS (rtx->sinkpad);
258 GST_PAD_SET_PROXY_ALLOCATION (rtx->sinkpad);
259 gst_pad_set_event_function (rtx->sinkpad,
260 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_sink_event));
261 gst_pad_set_chain_function (rtx->sinkpad,
262 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain));
263 gst_pad_set_chain_list_function (rtx->sinkpad,
264 GST_DEBUG_FUNCPTR (gst_rtp_rtx_send_chain_list));
265 gst_element_add_pad (GST_ELEMENT (rtx), rtx->sinkpad);
267 rtx->queue = gst_data_queue_new (gst_rtp_rtx_send_queue_check_full, NULL,
269 rtx->ssrc_data = g_hash_table_new_full (g_direct_hash, g_direct_equal,
270 NULL, (GDestroyNotify) ssrc_rtx_data_free);
271 rtx->rtx_ssrcs = g_hash_table_new (g_direct_hash, g_direct_equal);
272 rtx->rtx_pt_map = g_hash_table_new (g_direct_hash, g_direct_equal);
274 rtx->max_size_time = DEFAULT_MAX_SIZE_TIME;
275 rtx->max_size_packets = DEFAULT_MAX_SIZE_PACKETS;
279 gst_rtp_rtx_send_set_flushing (GstRtpRtxSend * rtx, gboolean flush)
281 GST_OBJECT_LOCK (rtx);
282 gst_data_queue_set_flushing (rtx->queue, flush);
283 gst_data_queue_flush (rtx->queue);
284 GST_OBJECT_UNLOCK (rtx);
288 gst_rtp_rtx_send_queue_check_full (GstDataQueue * queue,
289 guint visible, guint bytes, guint64 time, gpointer checkdata)
295 gst_rtp_rtx_data_queue_item_free (gpointer item)
297 GstDataQueueItem *data = item;
299 gst_mini_object_unref (data->object);
300 g_slice_free (GstDataQueueItem, data);
304 gst_rtp_rtx_send_push_out (GstRtpRtxSend * rtx, gpointer object)
306 GstDataQueueItem *data;
309 data = g_slice_new0 (GstDataQueueItem);
310 data->object = GST_MINI_OBJECT (object);
313 data->visible = TRUE;
314 data->destroy = gst_rtp_rtx_data_queue_item_free;
316 success = gst_data_queue_push (rtx->queue, data);
319 data->destroy (data);
325 gst_rtp_rtx_send_choose_ssrc (GstRtpRtxSend * rtx, guint32 choice,
326 gboolean consider_choice)
328 guint32 ssrc = consider_choice ? choice : g_random_int ();
330 /* make sure to be different than any other */
331 while (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc)) ||
332 g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
333 ssrc = g_random_int ();
340 gst_rtp_rtx_send_get_ssrc_data (GstRtpRtxSend * rtx, guint32 ssrc)
343 guint32 rtx_ssrc = 0;
344 gboolean consider = FALSE;
346 if (G_UNLIKELY (!g_hash_table_contains (rtx->ssrc_data,
347 GUINT_TO_POINTER (ssrc)))) {
348 if (rtx->external_ssrc_map) {
350 ssrc_str = g_strdup_printf ("%" G_GUINT32_FORMAT, ssrc);
351 consider = gst_structure_get_uint (rtx->external_ssrc_map, ssrc_str,
355 rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, rtx_ssrc, consider);
356 data = ssrc_rtx_data_new (rtx_ssrc);
357 g_hash_table_insert (rtx->ssrc_data, GUINT_TO_POINTER (ssrc), data);
358 g_hash_table_insert (rtx->rtx_ssrcs, GUINT_TO_POINTER (rtx_ssrc),
359 GUINT_TO_POINTER (ssrc));
361 data = g_hash_table_lookup (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
366 /* Copy fixed header and extension. Add OSN before to copy payload
367 * Copy memory to avoid to manually copy each rtp buffer field.
370 gst_rtp_rtx_buffer_new (GstRtpRtxSend * rtx, GstBuffer * buffer)
372 GstMemory *mem = NULL;
373 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
374 GstRTPBuffer new_rtp = GST_RTP_BUFFER_INIT;
375 GstBuffer *new_buffer = gst_buffer_new ();
377 guint payload_len = 0;
383 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
385 /* get needed data from GstRtpRtxSend */
386 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
387 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
388 ssrc = data->rtx_ssrc;
389 seqnum = data->next_seqnum++;
390 fmtp = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_pt_map,
391 GUINT_TO_POINTER (gst_rtp_buffer_get_payload_type (&rtp))));
393 GST_DEBUG_OBJECT (rtx,
394 "retransmit seqnum: %" G_GUINT16_FORMAT ", ssrc: %" G_GUINT32_FORMAT,
397 /* gst_rtp_buffer_map does not map the payload so do it now */
398 gst_rtp_buffer_get_payload (&rtp);
400 /* copy fixed header */
401 mem = gst_memory_copy (rtp.map[0].memory, 0, rtp.size[0]);
402 gst_buffer_append_memory (new_buffer, mem);
404 /* copy extension if any */
406 mem = gst_memory_copy (rtp.map[1].memory, 0, rtp.size[1]);
407 gst_buffer_append_memory (new_buffer, mem);
410 /* copy payload and add OSN just before */
411 payload_len = 2 + rtp.size[2];
412 mem = gst_allocator_alloc (NULL, payload_len, NULL);
414 gst_memory_map (mem, &map, GST_MAP_WRITE);
415 GST_WRITE_UINT16_BE (map.data, gst_rtp_buffer_get_seq (&rtp));
417 memcpy (map.data + 2, rtp.data[2], rtp.size[2]);
418 gst_memory_unmap (mem, &map);
419 gst_buffer_append_memory (new_buffer, mem);
421 /* everything needed is copied */
422 gst_rtp_buffer_unmap (&rtp);
424 /* set ssrc, seqnum and fmtp */
425 gst_rtp_buffer_map (new_buffer, GST_MAP_WRITE, &new_rtp);
426 gst_rtp_buffer_set_ssrc (&new_rtp, ssrc);
427 gst_rtp_buffer_set_seq (&new_rtp, seqnum);
428 gst_rtp_buffer_set_payload_type (&new_rtp, fmtp);
429 /* RFC 4588: let other elements do the padding, as normal */
430 gst_rtp_buffer_set_padding (&new_rtp, FALSE);
431 gst_rtp_buffer_unmap (&new_rtp);
433 /* Copy over timestamps */
434 gst_buffer_copy_into (new_buffer, buffer, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
440 buffer_queue_items_cmp (BufferQueueItem * a, BufferQueueItem * b,
443 /* gst_rtp_buffer_compare_seqnum returns the opposite of what we want,
444 * it returns negative when seqnum1 > seqnum2 and we want negative
445 * when b > a, i.e. a is smaller, so it comes first in the sequence */
446 return gst_rtp_buffer_compare_seqnum (b->seqnum, a->seqnum);
450 gst_rtp_rtx_send_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
452 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
455 switch (GST_EVENT_TYPE (event)) {
456 case GST_EVENT_CUSTOM_UPSTREAM:
458 const GstStructure *s = gst_event_get_structure (event);
460 /* This event usually comes from the downstream gstrtpsession */
461 if (gst_structure_has_name (s, "GstRTPRetransmissionRequest")) {
464 GstBuffer *rtx_buf = NULL;
466 /* retrieve seqnum of the packet that need to be retransmitted */
467 if (!gst_structure_get_uint (s, "seqnum", &seqnum))
470 /* retrieve ssrc of the packet that need to be retransmitted */
471 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
474 GST_DEBUG_OBJECT (rtx,
475 "request seqnum: %" G_GUINT32_FORMAT ", ssrc: %" G_GUINT32_FORMAT,
478 GST_OBJECT_LOCK (rtx);
479 /* check if request is for us */
480 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
483 BufferQueueItem search_item;
485 /* update statistics */
486 ++rtx->num_rtx_requests;
488 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
490 search_item.seqnum = seqnum;
491 iter = g_sequence_lookup (data->queue, &search_item,
492 (GCompareDataFunc) buffer_queue_items_cmp, NULL);
494 BufferQueueItem *item = g_sequence_get (iter);
495 GST_DEBUG_OBJECT (rtx, "found %" G_GUINT16_FORMAT, item->seqnum);
496 rtx_buf = gst_rtp_rtx_buffer_new (rtx, item->buffer);
499 GST_OBJECT_UNLOCK (rtx);
502 gst_rtp_rtx_send_push_out (rtx, rtx_buf);
504 gst_event_unref (event);
507 /* This event usually comes from the downstream gstrtpsession */
508 } else if (gst_structure_has_name (s, "GstRTPCollision")) {
511 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
514 GST_DEBUG_OBJECT (rtx, "collision ssrc: %" G_GUINT32_FORMAT, ssrc);
516 GST_OBJECT_LOCK (rtx);
518 /* choose another ssrc for our retransmited stream */
519 if (g_hash_table_contains (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc))) {
523 master_ssrc = GPOINTER_TO_UINT (g_hash_table_lookup (rtx->rtx_ssrcs,
524 GUINT_TO_POINTER (ssrc)));
525 data = gst_rtp_rtx_send_get_ssrc_data (rtx, master_ssrc);
527 /* change rtx_ssrc and update the reverse map */
528 data->rtx_ssrc = gst_rtp_rtx_send_choose_ssrc (rtx, 0, FALSE);
529 g_hash_table_remove (rtx->rtx_ssrcs, GUINT_TO_POINTER (ssrc));
530 g_hash_table_insert (rtx->rtx_ssrcs,
531 GUINT_TO_POINTER (data->rtx_ssrc),
532 GUINT_TO_POINTER (master_ssrc));
534 GST_OBJECT_UNLOCK (rtx);
536 /* no need to forward to payloader because we make sure to have
539 gst_event_unref (event);
542 /* if master ssrc has collided, remove it from our data, as it
543 * is not going to be used any longer */
544 if (g_hash_table_contains (rtx->ssrc_data, GUINT_TO_POINTER (ssrc))) {
546 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
547 g_hash_table_remove (rtx->rtx_ssrcs,
548 GUINT_TO_POINTER (data->rtx_ssrc));
549 g_hash_table_remove (rtx->ssrc_data, GUINT_TO_POINTER (ssrc));
552 GST_OBJECT_UNLOCK (rtx);
554 /* forward event to payloader in case collided ssrc is
556 res = gst_pad_event_default (pad, parent, event);
559 res = gst_pad_event_default (pad, parent, event);
564 res = gst_pad_event_default (pad, parent, event);
571 gst_rtp_rtx_send_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
573 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
575 switch (GST_EVENT_TYPE (event)) {
576 case GST_EVENT_FLUSH_START:
577 gst_pad_push_event (rtx->srcpad, event);
578 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
579 gst_pad_pause_task (rtx->srcpad);
581 case GST_EVENT_FLUSH_STOP:
582 gst_pad_push_event (rtx->srcpad, event);
583 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
584 gst_pad_start_task (rtx->srcpad,
585 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
588 GST_INFO_OBJECT (rtx, "Got EOS - enqueueing it");
589 gst_rtp_rtx_send_push_out (rtx, event);
597 gpointer rtx_payload;
600 gst_event_parse_caps (event, &caps);
602 s = gst_caps_get_structure (caps, 0);
603 if (!gst_structure_get_uint (s, "ssrc", &ssrc))
605 if (!gst_structure_get_int (s, "payload", &payload))
609 GST_WARNING_OBJECT (rtx, "No payload in caps");
611 GST_OBJECT_LOCK (rtx);
612 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
613 if (!g_hash_table_lookup_extended (rtx->rtx_pt_map,
614 GUINT_TO_POINTER (payload), NULL, &rtx_payload))
615 rtx_payload = GINT_TO_POINTER (-1);
617 if (GPOINTER_TO_INT (rtx_payload) == -1 && payload != -1)
618 GST_WARNING_OBJECT (rtx, "Payload %d not in rtx-pt-map", payload);
620 GST_DEBUG_OBJECT (rtx,
621 "got caps for payload: %d->%d, ssrc: %u->%d: %" GST_PTR_FORMAT,
622 payload, GPOINTER_TO_INT (rtx_payload), ssrc, data->rtx_ssrc, caps);
624 gst_structure_get_int (s, "clock-rate", &data->clock_rate);
626 /* The session might need to know the RTX ssrc */
627 caps = gst_caps_copy (caps);
628 gst_caps_set_simple (caps, "rtx-ssrc", G_TYPE_UINT, data->rtx_ssrc,
629 "rtx-seqnum-offset", G_TYPE_UINT, data->seqnum_base, NULL);
631 if (GPOINTER_TO_INT (rtx_payload) != -1)
632 gst_caps_set_simple (caps, "rtx-payload", G_TYPE_INT,
633 GPOINTER_TO_INT (rtx_payload), NULL);
635 GST_DEBUG_OBJECT (rtx, "got clock-rate from caps: %d for ssrc: %u",
636 data->clock_rate, ssrc);
637 GST_OBJECT_UNLOCK (rtx);
639 gst_event_unref (event);
640 event = gst_event_new_caps (caps);
641 gst_caps_unref (caps);
647 return gst_pad_event_default (pad, parent, event);
650 /* like rtp_jitter_buffer_get_ts_diff() */
652 gst_rtp_rtx_send_get_ts_diff (SSRCRtxData * data)
654 guint64 high_ts, low_ts;
655 BufferQueueItem *high_buf, *low_buf;
659 g_sequence_get (g_sequence_iter_prev (g_sequence_get_end_iter
661 low_buf = g_sequence_get (g_sequence_get_begin_iter (data->queue));
663 if (!high_buf || !low_buf || high_buf == low_buf)
666 high_ts = high_buf->timestamp;
667 low_ts = low_buf->timestamp;
669 /* it needs to work if ts wraps */
670 if (high_ts >= low_ts) {
671 result = (guint32) (high_ts - low_ts);
673 result = (guint32) (high_ts + G_MAXUINT32 + 1 - low_ts);
676 /* return value in ms instead of clock ticks */
677 return (guint32) gst_util_uint64_scale_int (result, 1000, data->clock_rate);
680 /* Must be called with lock */
682 process_buffer (GstRtpRtxSend * rtx, GstBuffer * buffer)
684 GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
685 BufferQueueItem *item;
689 guint32 ssrc, rtptime;
691 /* read the information we want from the buffer */
692 gst_rtp_buffer_map (buffer, GST_MAP_READ, &rtp);
693 seqnum = gst_rtp_buffer_get_seq (&rtp);
694 payload_type = gst_rtp_buffer_get_payload_type (&rtp);
695 ssrc = gst_rtp_buffer_get_ssrc (&rtp);
696 rtptime = gst_rtp_buffer_get_timestamp (&rtp);
697 gst_rtp_buffer_unmap (&rtp);
700 "Processing buffer seqnum: %" G_GUINT16_FORMAT ", ssrc: %"
701 G_GUINT32_FORMAT, seqnum, ssrc);
703 /* do not store the buffer if it's payload type is unknown */
704 if (g_hash_table_contains (rtx->rtx_pt_map, GUINT_TO_POINTER (payload_type))) {
705 data = gst_rtp_rtx_send_get_ssrc_data (rtx, ssrc);
707 /* add current rtp buffer to queue history */
708 item = g_slice_new0 (BufferQueueItem);
709 item->seqnum = seqnum;
710 item->timestamp = rtptime;
711 item->buffer = gst_buffer_ref (buffer);
712 g_sequence_append (data->queue, item);
714 /* remove oldest packets from history if they are too many */
715 if (rtx->max_size_packets) {
716 while (g_sequence_get_length (data->queue) > rtx->max_size_packets)
717 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
719 if (rtx->max_size_time) {
720 while (gst_rtp_rtx_send_get_ts_diff (data) > rtx->max_size_time)
721 g_sequence_remove (g_sequence_get_begin_iter (data->queue));
727 gst_rtp_rtx_send_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
729 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
732 GST_OBJECT_LOCK (rtx);
733 process_buffer (rtx, buffer);
734 GST_OBJECT_UNLOCK (rtx);
735 ret = gst_pad_push (rtx->srcpad, buffer);
741 process_buffer_from_list (GstBuffer ** buffer, guint idx, gpointer user_data)
743 process_buffer (user_data, *buffer);
748 gst_rtp_rtx_send_chain_list (GstPad * pad, GstObject * parent,
749 GstBufferList * list)
751 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
754 GST_OBJECT_LOCK (rtx);
755 gst_buffer_list_foreach (list, process_buffer_from_list, rtx);
756 GST_OBJECT_UNLOCK (rtx);
758 ret = gst_pad_push_list (rtx->srcpad, list);
764 gst_rtp_rtx_send_src_loop (GstRtpRtxSend * rtx)
766 GstDataQueueItem *data;
768 if (gst_data_queue_pop (rtx->queue, &data)) {
769 GST_LOG_OBJECT (rtx, "pushing rtx buffer %p", data->object);
771 if (G_LIKELY (GST_IS_BUFFER (data->object))) {
772 gst_pad_push (rtx->srcpad, GST_BUFFER (data->object));
774 GST_OBJECT_LOCK (rtx);
775 rtx->num_rtx_packets++;
776 GST_OBJECT_UNLOCK (rtx);
777 } else if (GST_IS_EVENT (data->object)) {
778 gst_pad_push_event (rtx->srcpad, GST_EVENT (data->object));
780 /* after EOS, we should not send any more buffers,
781 * even if there are more requests coming in */
782 if (GST_EVENT_TYPE (data->object) == GST_EVENT_EOS) {
783 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
786 g_assert_not_reached ();
789 data->object = NULL; /* we no longer own that object */
790 data->destroy (data);
792 GST_LOG_OBJECT (rtx, "flushing");
793 gst_pad_pause_task (rtx->srcpad);
798 gst_rtp_rtx_send_activate_mode (GstPad * pad, GstObject * parent,
799 GstPadMode mode, gboolean active)
801 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (parent);
802 gboolean ret = FALSE;
805 case GST_PAD_MODE_PUSH:
807 gst_rtp_rtx_send_set_flushing (rtx, FALSE);
808 ret = gst_pad_start_task (rtx->srcpad,
809 (GstTaskFunction) gst_rtp_rtx_send_src_loop, rtx, NULL);
811 gst_rtp_rtx_send_set_flushing (rtx, TRUE);
812 ret = gst_pad_stop_task (rtx->srcpad);
814 GST_INFO_OBJECT (rtx, "activate_mode: active %d, ret %d", active, ret);
823 gst_rtp_rtx_send_get_property (GObject * object,
824 guint prop_id, GValue * value, GParamSpec * pspec)
826 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
829 case PROP_PAYLOAD_TYPE_MAP:
830 GST_OBJECT_LOCK (rtx);
831 g_value_set_boxed (value, rtx->rtx_pt_map_structure);
832 GST_OBJECT_UNLOCK (rtx);
834 case PROP_MAX_SIZE_TIME:
835 GST_OBJECT_LOCK (rtx);
836 g_value_set_uint (value, rtx->max_size_time);
837 GST_OBJECT_UNLOCK (rtx);
839 case PROP_MAX_SIZE_PACKETS:
840 GST_OBJECT_LOCK (rtx);
841 g_value_set_uint (value, rtx->max_size_packets);
842 GST_OBJECT_UNLOCK (rtx);
844 case PROP_NUM_RTX_REQUESTS:
845 GST_OBJECT_LOCK (rtx);
846 g_value_set_uint (value, rtx->num_rtx_requests);
847 GST_OBJECT_UNLOCK (rtx);
849 case PROP_NUM_RTX_PACKETS:
850 GST_OBJECT_LOCK (rtx);
851 g_value_set_uint (value, rtx->num_rtx_packets);
852 GST_OBJECT_UNLOCK (rtx);
855 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
861 structure_to_hash_table (GQuark field_id, const GValue * value, gpointer hash)
863 const gchar *field_str;
867 field_str = g_quark_to_string (field_id);
868 field_uint = atoi (field_str);
869 value_uint = g_value_get_uint (value);
870 g_hash_table_insert ((GHashTable *) hash, GUINT_TO_POINTER (field_uint),
871 GUINT_TO_POINTER (value_uint));
877 gst_rtp_rtx_send_set_property (GObject * object,
878 guint prop_id, const GValue * value, GParamSpec * pspec)
880 GstRtpRtxSend *rtx = GST_RTP_RTX_SEND (object);
884 GST_OBJECT_LOCK (rtx);
885 if (rtx->external_ssrc_map)
886 gst_structure_free (rtx->external_ssrc_map);
887 rtx->external_ssrc_map = g_value_dup_boxed (value);
888 GST_OBJECT_UNLOCK (rtx);
890 case PROP_PAYLOAD_TYPE_MAP:
891 GST_OBJECT_LOCK (rtx);
892 if (rtx->rtx_pt_map_structure)
893 gst_structure_free (rtx->rtx_pt_map_structure);
894 rtx->rtx_pt_map_structure = g_value_dup_boxed (value);
895 g_hash_table_remove_all (rtx->rtx_pt_map);
896 gst_structure_foreach (rtx->rtx_pt_map_structure, structure_to_hash_table,
898 GST_OBJECT_UNLOCK (rtx);
900 case PROP_MAX_SIZE_TIME:
901 GST_OBJECT_LOCK (rtx);
902 rtx->max_size_time = g_value_get_uint (value);
903 GST_OBJECT_UNLOCK (rtx);
905 case PROP_MAX_SIZE_PACKETS:
906 GST_OBJECT_LOCK (rtx);
907 rtx->max_size_packets = g_value_get_uint (value);
908 GST_OBJECT_UNLOCK (rtx);
911 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
916 static GstStateChangeReturn
917 gst_rtp_rtx_send_change_state (GstElement * element, GstStateChange transition)
919 GstStateChangeReturn ret;
922 rtx = GST_RTP_RTX_SEND (element);
924 switch (transition) {
930 GST_ELEMENT_CLASS (gst_rtp_rtx_send_parent_class)->change_state (element,
933 switch (transition) {
934 case GST_STATE_CHANGE_PAUSED_TO_READY:
935 gst_rtp_rtx_send_reset (rtx);
945 gst_rtp_rtx_send_plugin_init (GstPlugin * plugin)
947 GST_DEBUG_CATEGORY_INIT (gst_rtp_rtx_send_debug, "rtprtxsend", 0,
948 "rtp retransmission sender");
950 return gst_element_register (plugin, "rtprtxsend", GST_RANK_NONE,
951 GST_TYPE_RTP_RTX_SEND);