3 * Copyright (C) 2007 Alessandro Decina
6 * Alessandro Decina <alessandro@nnva.org>
7 * Zaheer Abbas Merali <zaheerabbas at merali dot org>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
33 #include "mpegtsbase.h"
34 #include "mpegtsparse.h"
35 #include "gstmpegdesc.h"
37 /* latency in mseconds is maximum 100 ms between PCR */
38 #define TS_LATENCY 100
40 #define TABLE_ID_UNSET 0xFF
41 #define RUNNING_STATUS_RUNNING 4
43 GST_DEBUG_CATEGORY_STATIC (mpegts_parse_debug);
44 #define GST_CAT_DEFAULT mpegts_parse_debug
46 typedef struct _MpegTSParsePad MpegTSParsePad;
50 MpegTSBaseProgram program;
51 MpegTSParsePad *tspad;
54 struct _MpegTSParsePad
58 /* the program number that the peer wants on this pad */
60 MpegTSParseProgram *program;
62 /* set to FALSE before a push and TRUE after */
65 /* the return of the latest push */
66 GstFlowReturn flow_return;
69 static GstStaticPadTemplate src_template =
70 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
72 GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
75 static GstStaticPadTemplate program_template =
76 GST_STATIC_PAD_TEMPLATE ("program_%u", GST_PAD_SRC,
78 GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
85 PROP_SMOOTHING_LATENCY,
90 static void mpegts_parse_set_property (GObject * object, guint prop_id,
91 const GValue * value, GParamSpec * pspec);
92 static void mpegts_parse_get_property (GObject * object, guint prop_id,
93 GValue * value, GParamSpec * pspec);
96 mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program);
98 mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program);
101 mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
102 GstMpegtsSection * section);
103 static void mpegts_parse_inspect_packet (MpegTSBase * base,
104 MpegTSPacketizerPacket * packet);
105 static GstFlowReturn mpegts_parse_have_buffer (MpegTSBase * base,
108 static MpegTSParsePad *mpegts_parse_create_tspad (MpegTSParse2 * parse,
110 static void mpegts_parse_destroy_tspad (MpegTSParse2 * parse,
111 MpegTSParsePad * tspad);
113 static void mpegts_parse_pad_removed (GstElement * element, GstPad * pad);
114 static GstPad *mpegts_parse_request_new_pad (GstElement * element,
115 GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
116 static void mpegts_parse_release_pad (GstElement * element, GstPad * pad);
117 static gboolean mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent,
119 static gboolean push_event (MpegTSBase * base, GstEvent * event);
121 #define mpegts_parse_parent_class parent_class
122 G_DEFINE_TYPE (MpegTSParse2, mpegts_parse, GST_TYPE_MPEGTS_BASE);
123 static void mpegts_parse_reset (MpegTSBase * base);
125 drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all);
128 mpegts_parse_dispose (GObject * object)
130 MpegTSParse2 *parse = (MpegTSParse2 *) object;
132 gst_flow_combiner_free (parse->flowcombiner);
134 GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
138 mpegts_parse_class_init (MpegTSParse2Class * klass)
140 GObjectClass *gobject_class = (GObjectClass *) (klass);
141 GstElementClass *element_class;
142 MpegTSBaseClass *ts_class;
144 gobject_class->set_property = mpegts_parse_set_property;
145 gobject_class->get_property = mpegts_parse_get_property;
146 gobject_class->dispose = mpegts_parse_dispose;
148 g_object_class_install_property (gobject_class, PROP_SET_TIMESTAMPS,
149 g_param_spec_boolean ("set-timestamps",
150 "Timestamp (or re-timestamp) the output stream",
151 "If set, timestamps will be set on the output buffers using "
152 "PCRs and smoothed over the smoothing-latency period", FALSE,
153 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
154 g_object_class_install_property (gobject_class, PROP_SMOOTHING_LATENCY,
155 g_param_spec_uint ("smoothing-latency", "Smoothing Latency",
156 "Additional latency in microseconds for smoothing jitter in input timestamps on live capture",
157 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
158 g_object_class_install_property (gobject_class, PROP_PCR_PID,
159 g_param_spec_int ("pcr-pid", "PID containing PCR",
160 "Set the PID to use for PCR values (-1 for auto)",
161 -1, G_MAXINT, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
163 element_class = GST_ELEMENT_CLASS (klass);
164 element_class->pad_removed = mpegts_parse_pad_removed;
165 element_class->request_new_pad = mpegts_parse_request_new_pad;
166 element_class->release_pad = mpegts_parse_release_pad;
168 gst_element_class_add_static_pad_template (element_class, &src_template);
169 gst_element_class_add_static_pad_template (element_class, &program_template);
171 gst_element_class_set_static_metadata (element_class,
172 "MPEG transport stream parser", "Codec/Parser",
173 "Parses MPEG2 transport streams",
174 "Alessandro Decina <alessandro@nnva.org>, "
175 "Zaheer Abbas Merali <zaheerabbas at merali dot org>");
177 ts_class = GST_MPEGTS_BASE_CLASS (klass);
178 ts_class->push = GST_DEBUG_FUNCPTR (mpegts_parse_push);
179 ts_class->push_event = GST_DEBUG_FUNCPTR (push_event);
180 ts_class->program_started = GST_DEBUG_FUNCPTR (mpegts_parse_program_started);
181 ts_class->program_stopped = GST_DEBUG_FUNCPTR (mpegts_parse_program_stopped);
182 ts_class->reset = GST_DEBUG_FUNCPTR (mpegts_parse_reset);
183 ts_class->inspect_packet = GST_DEBUG_FUNCPTR (mpegts_parse_inspect_packet);
187 mpegts_parse_init (MpegTSParse2 * parse)
189 MpegTSBase *base = (MpegTSBase *) parse;
191 base->program_size = sizeof (MpegTSParseProgram);
192 base->push_data = TRUE;
193 base->push_section = TRUE;
195 parse->user_pcr_pid = parse->pcr_pid = -1;
197 parse->flowcombiner = gst_flow_combiner_new ();
199 parse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
200 gst_flow_combiner_add_pad (parse->flowcombiner, parse->srcpad);
202 gst_pad_set_query_function (parse->srcpad,
203 GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
204 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
206 parse->have_group_id = FALSE;
207 parse->group_id = G_MAXUINT;
211 mpegts_parse_reset (MpegTSBase * base)
213 MpegTSParse2 *parse = (MpegTSParse2 *) base;
215 /* Set the various know PIDs we are interested in */
218 MPEGTS_BIT_SET (base->known_psi, 1);
220 MPEGTS_BIT_SET (base->known_psi, 0x10);
222 MPEGTS_BIT_SET (base->known_psi, 0x11);
223 /* EIT, ST, CIT (TS 102 323) */
224 MPEGTS_BIT_SET (base->known_psi, 0x12);
226 MPEGTS_BIT_SET (base->known_psi, 0x13);
227 /* RNT (TS 102 323) */
228 MPEGTS_BIT_SET (base->known_psi, 0x16);
229 /* inband signalling */
230 MPEGTS_BIT_SET (base->known_psi, 0x1c);
232 MPEGTS_BIT_SET (base->known_psi, 0x1d);
234 MPEGTS_BIT_SET (base->known_psi, 0x1e);
236 MPEGTS_BIT_SET (base->known_psi, 0x1f);
239 parse->have_group_id = FALSE;
240 parse->group_id = G_MAXUINT;
242 g_list_free_full (parse->pending_buffers, (GDestroyNotify) gst_buffer_unref);
243 parse->pending_buffers = NULL;
245 parse->current_pcr = GST_CLOCK_TIME_NONE;
246 parse->previous_pcr = GST_CLOCK_TIME_NONE;
247 parse->base_pcr = GST_CLOCK_TIME_NONE;
248 parse->bytes_since_pcr = 0;
249 parse->pcr_pid = parse->user_pcr_pid;
250 parse->ts_offset = 0;
254 mpegts_parse_set_property (GObject * object, guint prop_id,
255 const GValue * value, GParamSpec * pspec)
257 MpegTSParse2 *parse = (MpegTSParse2 *) object;
260 case PROP_SET_TIMESTAMPS:
261 parse->set_timestamps = g_value_get_boolean (value);
263 case PROP_SMOOTHING_LATENCY:
264 parse->smoothing_latency = GST_USECOND * g_value_get_uint (value);
265 mpegts_packetizer_set_pcr_discont_threshold (GST_MPEGTS_BASE
266 (parse)->packetizer, parse->smoothing_latency);
269 parse->pcr_pid = parse->user_pcr_pid = g_value_get_int (value);
272 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
277 mpegts_parse_get_property (GObject * object, guint prop_id,
278 GValue * value, GParamSpec * pspec)
280 MpegTSParse2 *parse = (MpegTSParse2 *) object;
283 case PROP_SET_TIMESTAMPS:
284 g_value_set_boolean (value, parse->set_timestamps);
286 case PROP_SMOOTHING_LATENCY:
287 g_value_set_uint (value, parse->smoothing_latency / GST_USECOND);
290 g_value_set_int (value, parse->pcr_pid);
293 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
298 prepare_src_pad (MpegTSBase * base, MpegTSParse2 * parse)
307 /* If there's no packet_size yet, we can't set caps yet */
308 if (G_UNLIKELY (base->packetizer->packet_size == 0))
312 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (base),
316 gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
319 if (gst_event_parse_group_id (event, &parse->group_id))
320 parse->have_group_id = TRUE;
322 parse->have_group_id = FALSE;
323 gst_event_unref (event);
324 } else if (!parse->have_group_id) {
325 parse->have_group_id = TRUE;
326 parse->group_id = gst_util_group_id_next ();
328 event = gst_event_new_stream_start (stream_id);
329 if (parse->have_group_id)
330 gst_event_set_group_id (event, parse->group_id);
332 gst_pad_push_event (parse->srcpad, event);
335 caps = gst_caps_new_simple ("video/mpegts",
336 "systemstream", G_TYPE_BOOLEAN, TRUE,
337 "packetsize", G_TYPE_INT, base->packetizer->packet_size, NULL);
339 gst_pad_set_caps (parse->srcpad, caps);
340 gst_caps_unref (caps);
342 /* If setting output timestamps, ensure that the output segment is TIME */
343 if (parse->set_timestamps == FALSE || base->segment.format == GST_FORMAT_TIME)
344 /* Just use the upstream segment */
345 base->out_segment = base->segment;
347 GstSegment *seg = &base->out_segment;
348 gst_segment_init (seg, GST_FORMAT_TIME);
349 GST_DEBUG_OBJECT (parse,
350 "Generating time output segment %" GST_SEGMENT_FORMAT, seg);
352 gst_pad_push_event (parse->srcpad,
353 gst_event_new_segment (&base->out_segment));
355 parse->first = FALSE;
361 push_event (MpegTSBase * base, GstEvent * event)
363 MpegTSParse2 *parse = (MpegTSParse2 *) base;
366 if (G_UNLIKELY (parse->first)) {
367 /* We will send the segment when really starting */
368 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
369 gst_event_unref (event);
372 prepare_src_pad (base, parse);
374 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_EOS))
375 drain_pending_buffers (parse, TRUE);
377 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT))
378 parse->ts_offset = 0;
380 for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
381 GstPad *pad = (GstPad *) tmp->data;
383 gst_event_ref (event);
384 gst_pad_push_event (pad, event);
388 gst_pad_push_event (parse->srcpad, event);
393 static MpegTSParsePad *
394 mpegts_parse_create_tspad (MpegTSParse2 * parse, const gchar * pad_name)
397 MpegTSParsePad *tspad;
399 pad = gst_pad_new_from_static_template (&program_template, pad_name);
400 gst_pad_set_query_function (pad,
401 GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
403 /* create our wrapper */
404 tspad = g_new0 (MpegTSParsePad, 1);
406 tspad->program_number = -1;
407 tspad->program = NULL;
408 tspad->pushed = FALSE;
409 tspad->flow_return = GST_FLOW_NOT_LINKED;
410 gst_pad_set_element_private (pad, tspad);
411 gst_flow_combiner_add_pad (parse->flowcombiner, pad);
417 mpegts_parse_destroy_tspad (MpegTSParse2 * parse, MpegTSParsePad * tspad)
419 /* free the wrapper */
424 mpegts_parse_pad_removed (GstElement * element, GstPad * pad)
426 MpegTSParsePad *tspad;
427 MpegTSParse2 *parse = GST_MPEGTS_PARSE (element);
429 if (gst_pad_get_direction (pad) == GST_PAD_SINK)
432 tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
434 mpegts_parse_destroy_tspad (parse, tspad);
436 parse->srcpads = g_list_remove_all (parse->srcpads, pad);
439 if (GST_ELEMENT_CLASS (parent_class)->pad_removed)
440 GST_ELEMENT_CLASS (parent_class)->pad_removed (element, pad);
444 mpegts_parse_request_new_pad (GstElement * element, GstPadTemplate * template,
445 const gchar * padname, const GstCaps * caps)
448 MpegTSParsePad *tspad;
449 MpegTSParseProgram *parseprogram;
451 gint program_num = -1;
455 g_return_val_if_fail (template != NULL, NULL);
456 g_return_val_if_fail (GST_IS_MPEGTS_PARSE (element), NULL);
457 g_return_val_if_fail (padname != NULL, NULL);
459 sscanf (padname + 8, "%d", &program_num);
461 GST_DEBUG_OBJECT (element, "padname:%s, program:%d", padname, program_num);
463 parse = GST_MPEGTS_PARSE (element);
465 tspad = mpegts_parse_create_tspad (parse, padname);
466 tspad->program_number = program_num;
468 /* Find if the program is already active */
470 (MpegTSParseProgram *) mpegts_base_get_program (GST_MPEGTS_BASE (parse),
473 tspad->program = parseprogram;
474 parseprogram->tspad = tspad;
478 parse->srcpads = g_list_append (parse->srcpads, pad);
480 gst_pad_set_active (pad, TRUE);
482 stream_id = gst_pad_create_stream_id (pad, element, padname + 8);
485 gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
488 if (gst_event_parse_group_id (event, &parse->group_id))
489 parse->have_group_id = TRUE;
491 parse->have_group_id = FALSE;
492 gst_event_unref (event);
493 } else if (!parse->have_group_id) {
494 parse->have_group_id = TRUE;
495 parse->group_id = gst_util_group_id_next ();
497 event = gst_event_new_stream_start (stream_id);
498 if (parse->have_group_id)
499 gst_event_set_group_id (event, parse->group_id);
501 gst_pad_push_event (pad, event);
504 gst_element_add_pad (element, pad);
510 mpegts_packet_to_buffer (MpegTSPacketizerPacket * packet)
513 gst_buffer_new_and_alloc (packet->data_end - packet->data_start);
514 gst_buffer_fill (buf, 0, packet->data_start,
515 packet->data_end - packet->data_start);
520 mpegts_parse_release_pad (GstElement * element, GstPad * pad)
522 MpegTSParse2 *parse = (MpegTSParse2 *) element;
524 gst_pad_set_active (pad, FALSE);
525 /* we do the cleanup in GstElement::pad-removed */
526 gst_flow_combiner_remove_pad (parse->flowcombiner, pad);
527 gst_element_remove_pad (element, pad);
531 mpegts_parse_tspad_push_section (MpegTSParse2 * parse, MpegTSParsePad * tspad,
532 GstMpegtsSection * section, MpegTSPacketizerPacket * packet)
534 GstFlowReturn ret = GST_FLOW_OK;
535 gboolean to_push = TRUE;
537 if (tspad->program_number != -1) {
538 if (tspad->program) {
539 /* we push all sections to all pads except PMTs which we
540 * only push to pads meant to receive that program number */
541 if (section->table_id == 0x02) {
543 if (section->subtable_extension != tspad->program_number)
546 } else if (section->table_id != 0x00) {
547 /* there's a program filter on the pad but the PMT for the program has not
548 * been parsed yet, ignore the pad until we get a PMT.
549 * But we always allow PAT to go through */
554 GST_DEBUG_OBJECT (parse,
555 "pushing section: %d program number: %d table_id: %d", to_push,
556 tspad->program_number, section->table_id);
559 GstBuffer *buf = mpegts_packet_to_buffer (packet);
560 ret = gst_pad_push (tspad->pad, buf);
561 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
564 GST_LOG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
569 mpegts_parse_tspad_push (MpegTSParse2 * parse, MpegTSParsePad * tspad,
570 MpegTSPacketizerPacket * packet)
572 GstFlowReturn ret = GST_FLOW_OK;
573 MpegTSBaseProgram *bp = NULL;
575 if (tspad->program_number != -1) {
577 bp = (MpegTSBaseProgram *) tspad->program;
579 bp = mpegts_base_get_program ((MpegTSBase *) parse,
580 tspad->program_number);
584 if (packet->pid == bp->pmt_pid || bp->streams == NULL
585 || bp->streams[packet->pid]) {
586 GstBuffer *buf = mpegts_packet_to_buffer (packet);
587 /* push if there's no filter or if the pid is in the filter */
588 ret = gst_pad_push (tspad->pad, buf);
589 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
592 GST_DEBUG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
598 pad_clear_for_push (GstPad * pad, MpegTSParse2 * parse)
600 MpegTSParsePad *tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
602 tspad->flow_return = GST_FLOW_NOT_LINKED;
603 tspad->pushed = FALSE;
607 mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
608 GstMpegtsSection * section)
610 MpegTSParse2 *parse = (MpegTSParse2 *) base;
612 gboolean done = FALSE;
614 MpegTSParsePad *tspad;
619 GST_OBJECT_LOCK (parse);
620 srcpads = parse->srcpads;
622 /* clear tspad->pushed on pads */
623 g_list_foreach (srcpads, (GFunc) pad_clear_for_push, parse);
625 ret = GST_FLOW_NOT_LINKED;
629 /* Get cookie and source pads list */
630 pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
631 if (G_LIKELY (srcpads)) {
632 pad = GST_PAD_CAST (srcpads->data);
635 GST_OBJECT_UNLOCK (parse);
637 buf = mpegts_packet_to_buffer (packet);
638 if (!(packet->afc_flags & MPEGTS_AFC_RANDOM_ACCESS_FLAG)) {
639 gst_buffer_set_flags (buf, GST_BUFFER_FLAG_DELTA_UNIT);
641 ret = mpegts_parse_have_buffer (base, buf);
643 while (pad && !done) {
644 tspad = gst_pad_get_element_private (pad);
646 if (G_LIKELY (!tspad->pushed)) {
649 mpegts_parse_tspad_push_section (parse, tspad, section, packet);
651 tspad->flow_return = mpegts_parse_tspad_push (parse, tspad, packet);
653 tspad->pushed = TRUE;
655 if (G_UNLIKELY (tspad->flow_return != GST_FLOW_OK
656 && tspad->flow_return != GST_FLOW_NOT_LINKED)) {
657 /* return the error upstream */
658 ret = tspad->flow_return;
664 if (ret == GST_FLOW_NOT_LINKED)
665 ret = tspad->flow_return;
667 g_object_unref (pad);
669 if (G_UNLIKELY (!done)) {
670 GST_OBJECT_LOCK (parse);
671 if (G_UNLIKELY (pads_cookie != GST_ELEMENT_CAST (parse)->pads_cookie)) {
673 GST_DEBUG ("resync");
674 pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
675 srcpads = parse->srcpads;
677 GST_DEBUG ("getting next pad");
679 srcpads = g_list_next (srcpads);
683 pad = GST_PAD_CAST (srcpads->data);
687 GST_OBJECT_UNLOCK (parse);
695 mpegts_parse_inspect_packet (MpegTSBase * base, MpegTSPacketizerPacket * packet)
697 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
698 GST_LOG ("pid 0x%04x pusi:%d, afc:%d, cont:%d, payload:%p PCR %"
699 G_GUINT64_FORMAT, packet->pid, packet->payload_unit_start_indicator,
700 packet->scram_afc_cc & 0x30,
701 FLAGS_CONTINUITY_COUNTER (packet->scram_afc_cc), packet->payload,
704 /* Store the PCR if desired */
705 if (parse->current_pcr == GST_CLOCK_TIME_NONE &&
706 packet->afc_flags & MPEGTS_AFC_PCR_FLAG) {
707 /* Take this as the pcr_pid if set to auto-select */
708 if (parse->pcr_pid == -1)
709 parse->pcr_pid = packet->pid;
710 /* Check the PCR-PID matches the program we want for multiple programs */
711 if (parse->pcr_pid == packet->pid) {
712 parse->current_pcr = mpegts_packetizer_pts_to_ts (base->packetizer,
713 PCRTIME_TO_GSTTIME (packet->pcr), parse->pcr_pid);
714 GST_DEBUG ("Got new PCR %" GST_TIME_FORMAT " raw %" G_GUINT64_FORMAT,
715 GST_TIME_ARGS (parse->current_pcr), packet->pcr);
716 if (parse->base_pcr == GST_CLOCK_TIME_NONE) {
717 parse->base_pcr = parse->current_pcr;
724 get_pending_timestamp_diff (MpegTSParse2 * parse)
727 GstClockTime first_ts, last_ts;
729 if (parse->pending_buffers == NULL)
730 return GST_CLOCK_TIME_NONE;
732 l = g_list_last (parse->pending_buffers);
733 first_ts = GST_BUFFER_PTS (l->data);
734 if (first_ts == GST_CLOCK_TIME_NONE)
735 return GST_CLOCK_TIME_NONE;
737 l = g_list_first (parse->pending_buffers);
738 last_ts = GST_BUFFER_PTS (l->data);
739 if (last_ts == GST_CLOCK_TIME_NONE)
740 return GST_CLOCK_TIME_NONE;
742 return last_ts - first_ts;
746 drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all)
748 GstFlowReturn ret = GST_FLOW_OK;
749 GstClockTime start_ts;
750 GstClockTime pcr = GST_CLOCK_TIME_NONE;
751 GstClockTime pcr_diff = 0;
752 gsize pcr_bytes, bytes_since_pcr, pos;
754 GList *l, *end = NULL;
756 if (parse->pending_buffers == NULL)
757 return GST_FLOW_OK; /* Nothing to push */
761 * 1 We get a buffer with no PCR -> it's the head of the list
762 * -> Do nothing, unless it's EOS
763 * 2 We get a buffer with a PCR, it's the first PCR we've seen, and belongs
764 * to the buffer at the head of the list
765 * -> Push any buffers in the list except the head,
766 * using a smoothing of their timestamps to land at the PCR
767 * -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
768 * 3 It's EOS (drain_all == TRUE, current_pcr == NONE)
769 * -> Push any buffers in the list using a smoothing of their timestamps
770 * starting at the previous PCR or first TS
771 * 4 We get a buffer with a PCR, and have a previous PCR
772 * -> If distance > smoothing_latency,
773 * output buffers except the last in the pending queue using
774 * piecewise-linear timestamps
775 * -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
779 if (!GST_CLOCK_TIME_IS_VALID (parse->current_pcr) && !drain_all)
782 if (GST_CLOCK_TIME_IS_VALID (parse->current_pcr)) {
783 pcr = parse->current_pcr;
784 parse->current_pcr = GST_CLOCK_TIME_NONE;
787 /* The bytes of the last buffer are after the PCR */
788 buffer = GST_BUFFER (g_list_nth_data (parse->pending_buffers, 0));
789 bytes_since_pcr = gst_buffer_get_size (buffer);
791 pcr_bytes = parse->bytes_since_pcr - bytes_since_pcr;
794 end = g_list_first (parse->pending_buffers);
797 if (!GST_CLOCK_TIME_IS_VALID (parse->previous_pcr)) {
798 pcr_diff = get_pending_timestamp_diff (parse);
800 /* Calculate the start_ts that ends at the end timestamp */
801 start_ts = GST_CLOCK_TIME_NONE;
803 start_ts = GST_BUFFER_PTS (GST_BUFFER (end->data));
804 if (start_ts > pcr_diff)
805 start_ts -= pcr_diff;
807 } else if (drain_all) { /* Case 3 */
808 start_ts = parse->previous_pcr;
809 pcr_diff = get_pending_timestamp_diff (parse);
810 } else { /* Case 4 */
811 start_ts = parse->previous_pcr;
812 if (GST_CLOCK_TIME_IS_VALID (pcr) && pcr > start_ts)
813 pcr_diff = GST_CLOCK_DIFF (start_ts, pcr);
815 /* Make sure PCR observations are sufficiently far apart */
816 if (drain_all == FALSE && pcr_diff < parse->smoothing_latency)
820 GST_INFO_OBJECT (parse, "Pushing buffers - startTS %" GST_TIME_FORMAT
821 " duration %" GST_TIME_FORMAT " %" G_GSIZE_FORMAT " bytes",
822 GST_TIME_ARGS (start_ts), GST_TIME_ARGS (pcr_diff), pcr_bytes);
824 /* Now, push buffers out pacing timestamps over pcr_diff time and pcr_bytes */
826 l = g_list_last (parse->pending_buffers);
829 GstClockTime out_ts = start_ts;
831 buffer = gst_buffer_make_writable (GST_BUFFER (l->data));
833 if (out_ts != GST_CLOCK_TIME_NONE && pcr_diff != GST_CLOCK_TIME_NONE &&
835 out_ts += gst_util_uint64_scale (pcr_diff, pos, pcr_bytes);
837 pos += gst_buffer_get_size (buffer);
839 GST_DEBUG_OBJECT (parse,
840 "InputTS %" GST_TIME_FORMAT " out %" GST_TIME_FORMAT,
841 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)), GST_TIME_ARGS (out_ts));
843 GST_BUFFER_PTS (buffer) = out_ts + parse->ts_offset;
844 GST_BUFFER_DTS (buffer) = out_ts + parse->ts_offset;
845 if (ret == GST_FLOW_OK) {
846 ret = gst_pad_push (parse->srcpad, buffer);
847 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
849 gst_buffer_unref (buffer);
851 /* Free this list node and move to the next */
852 p = g_list_previous (l);
853 parse->pending_buffers = g_list_delete_link (parse->pending_buffers, l);
857 parse->pending_buffers = end;
858 parse->bytes_since_pcr = bytes_since_pcr;
859 parse->previous_pcr = pcr;
864 mpegts_parse_have_buffer (MpegTSBase * base, GstBuffer * buffer)
866 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
867 GstFlowReturn ret = GST_FLOW_OK;
869 GST_LOG_OBJECT (parse, "Received buffer %" GST_PTR_FORMAT, buffer);
871 if (parse->current_pcr != GST_CLOCK_TIME_NONE) {
872 GST_DEBUG_OBJECT (parse,
873 "InputTS %" GST_TIME_FORMAT " PCR %" GST_TIME_FORMAT,
874 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
875 GST_TIME_ARGS (parse->current_pcr));
878 if (parse->set_timestamps || parse->first) {
879 parse->pending_buffers = g_list_prepend (parse->pending_buffers, buffer);
880 parse->bytes_since_pcr += gst_buffer_get_size (buffer);
884 if (!prepare_src_pad (base, parse))
887 if (parse->pending_buffers != NULL) {
888 /* Don't keep pending_buffers if not setting output timestamps */
889 gboolean drain_all = (parse->set_timestamps == FALSE);
890 ret = drain_pending_buffers (parse, drain_all);
891 if (ret != GST_FLOW_OK) {
893 gst_buffer_unref (buffer);
898 if (buffer != NULL) {
899 ret = gst_pad_push (parse->srcpad, buffer);
900 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
906 static MpegTSParsePad *
907 find_pad_for_program (MpegTSParse2 * parse, guint program_number)
911 for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
912 MpegTSParsePad *tspad = gst_pad_get_element_private ((GstPad *) tmp->data);
914 if (tspad->program_number == program_number)
922 mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program)
924 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
925 MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
926 MpegTSParsePad *tspad;
928 /* If we have a request pad for that program, activate it */
929 tspad = find_pad_for_program (parse, program->program_number);
932 tspad->program = parseprogram;
933 parseprogram->tspad = tspad;
938 mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program)
940 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
941 MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
942 MpegTSParsePad *tspad;
944 /* If we have a request pad for that program, activate it */
945 tspad = find_pad_for_program (parse, program->program_number);
948 tspad->program = NULL;
949 parseprogram->tspad = NULL;
953 parse->ts_offset += parse->current_pcr - parse->base_pcr;
954 parse->base_pcr = GST_CLOCK_TIME_NONE;
958 mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
960 MpegTSParse2 *parse = GST_MPEGTS_PARSE (parent);
963 switch (GST_QUERY_TYPE (query)) {
964 case GST_QUERY_LATENCY:
966 if ((res = gst_pad_peer_query (((MpegTSBase *) parse)->sinkpad, query))) {
968 GstClockTime min_latency, max_latency;
970 gst_query_parse_latency (query, &is_live, &min_latency, &max_latency);
972 GstClockTime extra_latency = TS_LATENCY * GST_MSECOND;
973 if (parse->set_timestamps) {
974 extra_latency = MAX (extra_latency, parse->smoothing_latency);
976 min_latency += extra_latency;
977 if (max_latency != GST_CLOCK_TIME_NONE)
978 max_latency += extra_latency;
981 gst_query_set_latency (query, is_live, min_latency, max_latency);
986 res = gst_pad_query_default (pad, parent, query);
992 gst_mpegtsparse_plugin_init (GstPlugin * plugin)
994 GST_DEBUG_CATEGORY_INIT (mpegts_parse_debug, "tsparse", 0,
995 "MPEG transport stream parser");
997 return gst_element_register (plugin, "tsparse",
998 GST_RANK_NONE, GST_TYPE_MPEGTS_PARSE);