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
42 #define SYNC_BYTE 0x47
44 GST_DEBUG_CATEGORY_STATIC (mpegts_parse_debug);
45 #define GST_CAT_DEFAULT mpegts_parse_debug
47 typedef struct _MpegTSParsePad MpegTSParsePad;
51 MpegTSBaseProgram program;
52 MpegTSParsePad *tspad;
55 struct _MpegTSParsePad
59 /* the program number that the peer wants on this pad */
61 MpegTSParseProgram *program;
63 /* set to FALSE before a push and TRUE after */
66 /* the return of the latest push */
67 GstFlowReturn flow_return;
69 MpegTSParse2Adapter ts_adapter;
72 static GstStaticPadTemplate src_template =
73 GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC,
75 GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
78 static GstStaticPadTemplate program_template =
79 GST_STATIC_PAD_TEMPLATE ("program_%u", GST_PAD_SRC,
81 GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ")
88 PROP_SMOOTHING_LATENCY,
94 static void mpegts_parse_set_property (GObject * object, guint prop_id,
95 const GValue * value, GParamSpec * pspec);
96 static void mpegts_parse_get_property (GObject * object, guint prop_id,
97 GValue * value, GParamSpec * pspec);
100 mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program);
102 mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program);
105 mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
106 GstMpegtsSection * section);
107 static void mpegts_parse_inspect_packet (MpegTSBase * base,
108 MpegTSPacketizerPacket * packet);
109 static GstFlowReturn mpegts_parse_have_buffer (MpegTSBase * base,
112 static MpegTSParsePad *mpegts_parse_create_tspad (MpegTSParse2 * parse,
114 static void mpegts_parse_destroy_tspad (MpegTSParse2 * parse,
115 MpegTSParsePad * tspad);
117 static void mpegts_parse_pad_removed (GstElement * element, GstPad * pad);
118 static GstPad *mpegts_parse_request_new_pad (GstElement * element,
119 GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
120 static void mpegts_parse_release_pad (GstElement * element, GstPad * pad);
121 static gboolean mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent,
123 static gboolean push_event (MpegTSBase * base, GstEvent * event);
125 #define mpegts_parse_parent_class parent_class
126 G_DEFINE_TYPE (MpegTSParse2, mpegts_parse, GST_TYPE_MPEGTS_BASE);
127 static void mpegts_parse_reset (MpegTSBase * base);
128 static GstFlowReturn mpegts_parse_input_done (MpegTSBase * base,
131 drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all);
134 mpegts_parse_finalize (GObject * object)
136 MpegTSParse2 *parse = (MpegTSParse2 *) object;
138 gst_flow_combiner_free (parse->flowcombiner);
140 gst_adapter_clear (parse->ts_adapter.adapter);
141 g_object_unref (parse->ts_adapter.adapter);
143 GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
147 mpegts_parse_class_init (MpegTSParse2Class * klass)
149 GObjectClass *gobject_class = (GObjectClass *) (klass);
150 GstElementClass *element_class;
151 MpegTSBaseClass *ts_class;
153 gobject_class->set_property = mpegts_parse_set_property;
154 gobject_class->get_property = mpegts_parse_get_property;
155 gobject_class->finalize = mpegts_parse_finalize;
157 g_object_class_install_property (gobject_class, PROP_SET_TIMESTAMPS,
158 g_param_spec_boolean ("set-timestamps",
159 "Timestamp (or re-timestamp) the output stream",
160 "If set, timestamps will be set on the output buffers using "
161 "PCRs and smoothed over the smoothing-latency period", FALSE,
162 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
163 g_object_class_install_property (gobject_class, PROP_SMOOTHING_LATENCY,
164 g_param_spec_uint ("smoothing-latency", "Smoothing Latency",
165 "Additional latency in microseconds for smoothing jitter in input timestamps on live capture",
166 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
167 g_object_class_install_property (gobject_class, PROP_PCR_PID,
168 g_param_spec_int ("pcr-pid", "PID containing PCR",
169 "Set the PID to use for PCR values (-1 for auto)",
170 -1, G_MAXINT, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
171 g_object_class_install_property (gobject_class, PROP_ALIGNMENT,
172 g_param_spec_uint ("alignment", "Alignment",
173 "Number of packets per buffer (padded with dummy packets on EOS) (0 = auto)",
174 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
176 element_class = GST_ELEMENT_CLASS (klass);
177 element_class->pad_removed = mpegts_parse_pad_removed;
178 element_class->request_new_pad = mpegts_parse_request_new_pad;
179 element_class->release_pad = mpegts_parse_release_pad;
181 gst_element_class_add_static_pad_template (element_class, &src_template);
182 gst_element_class_add_static_pad_template (element_class, &program_template);
184 gst_element_class_set_static_metadata (element_class,
185 "MPEG transport stream parser", "Codec/Parser",
186 "Parses MPEG2 transport streams",
187 "Alessandro Decina <alessandro@nnva.org>, "
188 "Zaheer Abbas Merali <zaheerabbas at merali dot org>");
190 ts_class = GST_MPEGTS_BASE_CLASS (klass);
191 ts_class->push = GST_DEBUG_FUNCPTR (mpegts_parse_push);
192 ts_class->push_event = GST_DEBUG_FUNCPTR (push_event);
193 ts_class->program_started = GST_DEBUG_FUNCPTR (mpegts_parse_program_started);
194 ts_class->program_stopped = GST_DEBUG_FUNCPTR (mpegts_parse_program_stopped);
195 ts_class->reset = GST_DEBUG_FUNCPTR (mpegts_parse_reset);
196 ts_class->input_done = GST_DEBUG_FUNCPTR (mpegts_parse_input_done);
197 ts_class->inspect_packet = GST_DEBUG_FUNCPTR (mpegts_parse_inspect_packet);
201 mpegts_parse_init (MpegTSParse2 * parse)
203 MpegTSBase *base = (MpegTSBase *) parse;
205 base->program_size = sizeof (MpegTSParseProgram);
206 base->push_data = TRUE;
207 base->push_section = TRUE;
209 parse->user_pcr_pid = parse->pcr_pid = -1;
211 parse->flowcombiner = gst_flow_combiner_new ();
213 parse->srcpad = gst_pad_new_from_static_template (&src_template, "src");
214 gst_flow_combiner_add_pad (parse->flowcombiner, parse->srcpad);
216 gst_pad_set_query_function (parse->srcpad,
217 GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
218 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
220 parse->have_group_id = FALSE;
221 parse->group_id = G_MAXUINT;
223 parse->ts_adapter.adapter = gst_adapter_new ();
224 parse->ts_adapter.packets_in_adapter = 0;
225 parse->alignment = 0;
226 parse->is_eos = FALSE;
231 mpegts_parse_reset (MpegTSBase * base)
233 MpegTSParse2 *parse = (MpegTSParse2 *) base;
235 /* Set the various know PIDs we are interested in */
238 MPEGTS_BIT_SET (base->known_psi, 1);
240 MPEGTS_BIT_SET (base->known_psi, 0x10);
242 MPEGTS_BIT_SET (base->known_psi, 0x11);
243 /* EIT, ST, CIT (TS 102 323) */
244 MPEGTS_BIT_SET (base->known_psi, 0x12);
246 MPEGTS_BIT_SET (base->known_psi, 0x13);
247 /* RNT (TS 102 323) */
248 MPEGTS_BIT_SET (base->known_psi, 0x16);
249 /* inband signalling */
250 MPEGTS_BIT_SET (base->known_psi, 0x1c);
252 MPEGTS_BIT_SET (base->known_psi, 0x1d);
254 MPEGTS_BIT_SET (base->known_psi, 0x1e);
256 MPEGTS_BIT_SET (base->known_psi, 0x1f);
259 parse->have_group_id = FALSE;
260 parse->group_id = G_MAXUINT;
262 g_list_free_full (parse->pending_buffers, (GDestroyNotify) gst_buffer_unref);
263 parse->pending_buffers = NULL;
265 parse->current_pcr = GST_CLOCK_TIME_NONE;
266 parse->previous_pcr = GST_CLOCK_TIME_NONE;
267 parse->base_pcr = GST_CLOCK_TIME_NONE;
268 parse->bytes_since_pcr = 0;
269 parse->pcr_pid = parse->user_pcr_pid;
270 parse->ts_offset = 0;
272 gst_adapter_clear (parse->ts_adapter.adapter);
273 parse->ts_adapter.packets_in_adapter = 0;
274 parse->is_eos = FALSE;
279 mpegts_parse_set_property (GObject * object, guint prop_id,
280 const GValue * value, GParamSpec * pspec)
282 MpegTSParse2 *parse = (MpegTSParse2 *) object;
285 case PROP_SET_TIMESTAMPS:
286 parse->set_timestamps = g_value_get_boolean (value);
288 case PROP_SMOOTHING_LATENCY:
289 parse->smoothing_latency = GST_USECOND * g_value_get_uint (value);
290 mpegts_packetizer_set_pcr_discont_threshold (GST_MPEGTS_BASE
291 (parse)->packetizer, parse->smoothing_latency);
294 parse->pcr_pid = parse->user_pcr_pid = g_value_get_int (value);
297 parse->alignment = g_value_get_uint (value);
300 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
305 mpegts_parse_get_property (GObject * object, guint prop_id,
306 GValue * value, GParamSpec * pspec)
308 MpegTSParse2 *parse = (MpegTSParse2 *) object;
311 case PROP_SET_TIMESTAMPS:
312 g_value_set_boolean (value, parse->set_timestamps);
314 case PROP_SMOOTHING_LATENCY:
315 g_value_set_uint (value, parse->smoothing_latency / GST_USECOND);
318 g_value_set_int (value, parse->pcr_pid);
321 g_value_set_uint (value, parse->alignment);
324 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
329 prepare_src_pad (MpegTSBase * base, MpegTSParse2 * parse)
338 /* If there's no packet_size yet, we can't set caps yet */
339 if (G_UNLIKELY (base->packetizer->packet_size == 0))
343 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (base),
347 gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
350 if (gst_event_parse_group_id (event, &parse->group_id))
351 parse->have_group_id = TRUE;
353 parse->have_group_id = FALSE;
354 gst_event_unref (event);
355 } else if (!parse->have_group_id) {
356 parse->have_group_id = TRUE;
357 parse->group_id = gst_util_group_id_next ();
359 event = gst_event_new_stream_start (stream_id);
360 if (parse->have_group_id)
361 gst_event_set_group_id (event, parse->group_id);
363 gst_pad_push_event (parse->srcpad, event);
366 caps = gst_caps_new_simple ("video/mpegts",
367 "systemstream", G_TYPE_BOOLEAN, TRUE,
368 "packetsize", G_TYPE_INT, base->packetizer->packet_size, NULL);
370 gst_pad_set_caps (parse->srcpad, caps);
371 gst_caps_unref (caps);
373 /* If setting output timestamps, ensure that the output segment is TIME */
374 if (parse->set_timestamps == FALSE || base->segment.format == GST_FORMAT_TIME)
375 /* Just use the upstream segment */
376 base->out_segment = base->segment;
378 GstSegment *seg = &base->out_segment;
379 gst_segment_init (seg, GST_FORMAT_TIME);
380 GST_DEBUG_OBJECT (parse,
381 "Generating time output segment %" GST_SEGMENT_FORMAT, seg);
383 gst_pad_push_event (parse->srcpad,
384 gst_event_new_segment (&base->out_segment));
386 parse->first = FALSE;
392 push_event (MpegTSBase * base, GstEvent * event)
394 MpegTSParse2 *parse = (MpegTSParse2 *) base;
397 if (G_UNLIKELY (parse->first)) {
398 /* We will send the segment when really starting */
399 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT)) {
400 gst_event_unref (event);
403 prepare_src_pad (base, parse);
405 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_EOS)) {
406 parse->is_eos = TRUE;
408 if (parse->alignment > 0 && parse->ts_adapter.packets_in_adapter > 0
409 && parse->ts_adapter.packets_in_adapter < parse->alignment) {
413 gint missing_packets =
414 parse->alignment - parse->ts_adapter.packets_in_adapter;
415 gint i = missing_packets;
416 gsize packet_size = base->packetizer->packet_size;
418 GST_DEBUG_OBJECT (parse, "Adding %d dummy packets", missing_packets);
420 buf = gst_buffer_new_and_alloc (missing_packets * packet_size);
421 gst_buffer_map (buf, &map, GST_MAP_READWRITE);
424 g_assert (packet_size > 0);
429 if (packet_size > MPEGTS_NORMAL_PACKETSIZE) {
431 GST_WRITE_UINT32_BE (data, parse->header);
436 GST_WRITE_UINT8 (data + offset, SYNC_BYTE);
437 /* null packet PID */
438 GST_WRITE_UINT16_BE (data + offset + 1, 0x1FFF);
439 /* no adaptation field exists | continuity counter undefined */
440 GST_WRITE_UINT8 (data + offset + 3, 0x10);
442 memset (data + offset + 4, 0, MPEGTS_NORMAL_PACKETSIZE - 4);
445 gst_buffer_unmap (buf, &map);
446 gst_adapter_push (parse->ts_adapter.adapter, buf);
447 parse->ts_adapter.packets_in_adapter += missing_packets;
449 drain_pending_buffers (parse, TRUE);
452 if (G_UNLIKELY (GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT))
453 parse->ts_offset = 0;
455 for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
456 GstPad *pad = (GstPad *) tmp->data;
458 gst_event_ref (event);
459 gst_pad_push_event (pad, event);
463 gst_pad_push_event (parse->srcpad, event);
468 static MpegTSParsePad *
469 mpegts_parse_create_tspad (MpegTSParse2 * parse, const gchar * pad_name)
472 MpegTSParsePad *tspad;
474 pad = gst_pad_new_from_static_template (&program_template, pad_name);
475 gst_pad_set_query_function (pad,
476 GST_DEBUG_FUNCPTR (mpegts_parse_src_pad_query));
478 /* create our wrapper */
479 tspad = g_new0 (MpegTSParsePad, 1);
481 tspad->program_number = -1;
482 tspad->program = NULL;
483 tspad->pushed = FALSE;
484 tspad->flow_return = GST_FLOW_NOT_LINKED;
485 tspad->ts_adapter.adapter = gst_adapter_new ();
486 tspad->ts_adapter.packets_in_adapter = 0;
487 gst_pad_set_element_private (pad, tspad);
488 gst_flow_combiner_add_pad (parse->flowcombiner, pad);
494 mpegts_parse_destroy_tspad (MpegTSParse2 * parse, MpegTSParsePad * tspad)
496 gst_adapter_clear (tspad->ts_adapter.adapter);
497 g_object_unref (tspad->ts_adapter.adapter);
499 /* free the wrapper */
504 mpegts_parse_pad_removed (GstElement * element, GstPad * pad)
506 MpegTSParsePad *tspad;
507 MpegTSParse2 *parse = GST_MPEGTS_PARSE (element);
509 if (gst_pad_get_direction (pad) == GST_PAD_SINK)
512 tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
514 mpegts_parse_destroy_tspad (parse, tspad);
516 parse->srcpads = g_list_remove_all (parse->srcpads, pad);
519 if (GST_ELEMENT_CLASS (parent_class)->pad_removed)
520 GST_ELEMENT_CLASS (parent_class)->pad_removed (element, pad);
524 mpegts_parse_request_new_pad (GstElement * element, GstPadTemplate * template,
525 const gchar * padname, const GstCaps * caps)
528 MpegTSParsePad *tspad;
529 MpegTSParseProgram *parseprogram;
531 gint program_num = -1;
535 g_return_val_if_fail (template != NULL, NULL);
536 g_return_val_if_fail (GST_IS_MPEGTS_PARSE (element), NULL);
537 g_return_val_if_fail (padname != NULL, NULL);
539 sscanf (padname + 8, "%d", &program_num);
541 GST_DEBUG_OBJECT (element, "padname:%s, program:%d", padname, program_num);
543 parse = GST_MPEGTS_PARSE (element);
545 tspad = mpegts_parse_create_tspad (parse, padname);
546 tspad->program_number = program_num;
548 /* Find if the program is already active */
550 (MpegTSParseProgram *) mpegts_base_get_program (GST_MPEGTS_BASE (parse),
553 tspad->program = parseprogram;
554 parseprogram->tspad = tspad;
558 parse->srcpads = g_list_append (parse->srcpads, pad);
560 gst_pad_set_active (pad, TRUE);
562 stream_id = gst_pad_create_stream_id (pad, element, padname + 8);
565 gst_pad_get_sticky_event (parse->parent.sinkpad, GST_EVENT_STREAM_START,
568 if (gst_event_parse_group_id (event, &parse->group_id))
569 parse->have_group_id = TRUE;
571 parse->have_group_id = FALSE;
572 gst_event_unref (event);
573 } else if (!parse->have_group_id) {
574 parse->have_group_id = TRUE;
575 parse->group_id = gst_util_group_id_next ();
577 event = gst_event_new_stream_start (stream_id);
578 if (parse->have_group_id)
579 gst_event_set_group_id (event, parse->group_id);
581 gst_pad_push_event (pad, event);
584 gst_element_add_pad (element, pad);
590 mpegts_packet_to_buffer (MpegTSPacketizerPacket * packet)
593 gst_buffer_new_and_alloc (packet->data_end - packet->data_start);
594 gst_buffer_fill (buf, 0, packet->data_start,
595 packet->data_end - packet->data_start);
600 mpegts_parse_release_pad (GstElement * element, GstPad * pad)
602 MpegTSParse2 *parse = (MpegTSParse2 *) element;
604 gst_pad_set_active (pad, FALSE);
605 /* we do the cleanup in GstElement::pad-removed */
606 gst_flow_combiner_remove_pad (parse->flowcombiner, pad);
607 gst_element_remove_pad (element, pad);
611 empty_adapter_into_pad (MpegTSParse2Adapter * ts_adapter, GstPad * pad)
613 GstAdapter *adapter = ts_adapter->adapter;
614 GstBuffer *buf = NULL;
615 GstClockTime ts = gst_adapter_prev_pts (adapter, NULL);
616 gsize avail = gst_adapter_available (adapter);
617 GstFlowReturn ret = GST_FLOW_OK;
620 buf = gst_adapter_take_buffer (adapter, avail);
622 ts_adapter->packets_in_adapter = 0;
625 GST_BUFFER_PTS (buf) = ts;
626 ret = gst_pad_push (pad, buf);
633 enqueue_and_maybe_push_buffer (MpegTSParse2 * parse, GstPad * pad,
634 MpegTSParse2Adapter * ts_adapter, GstBuffer * buffer)
636 GstFlowReturn ret = GST_FLOW_OK;
638 if (buffer != NULL) {
639 if (parse->alignment == 1) {
640 ret = gst_pad_push (pad, buffer);
641 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
643 gst_adapter_push (ts_adapter->adapter, buffer);
644 ts_adapter->packets_in_adapter++;
646 if (ts_adapter->packets_in_adapter == parse->alignment
647 && ts_adapter->packets_in_adapter > 0) {
648 ret = empty_adapter_into_pad (ts_adapter, pad);
649 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
658 mpegts_parse_tspad_push_section (MpegTSParse2 * parse, MpegTSParsePad * tspad,
659 GstMpegtsSection * section, MpegTSPacketizerPacket * packet)
661 GstFlowReturn ret = GST_FLOW_OK;
662 gboolean to_push = TRUE;
664 if (tspad->program_number != -1) {
665 if (tspad->program) {
666 /* we push all sections to all pads except PMTs which we
667 * only push to pads meant to receive that program number */
668 if (section->table_id == 0x02) {
670 if (section->subtable_extension != tspad->program_number)
673 } else if (section->table_id != 0x00) {
674 /* there's a program filter on the pad but the PMT for the program has not
675 * been parsed yet, ignore the pad until we get a PMT.
676 * But we always allow PAT to go through */
681 GST_DEBUG_OBJECT (parse,
682 "pushing section: %d program number: %d table_id: %d", to_push,
683 tspad->program_number, section->table_id);
686 GstBuffer *buf = mpegts_packet_to_buffer (packet);
688 enqueue_and_maybe_push_buffer (parse, tspad->pad, &tspad->ts_adapter,
692 GST_LOG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
697 mpegts_parse_tspad_push (MpegTSParse2 * parse, MpegTSParsePad * tspad,
698 MpegTSPacketizerPacket * packet)
700 GstFlowReturn ret = GST_FLOW_OK;
701 MpegTSBaseProgram *bp = NULL;
703 if (tspad->program_number != -1) {
705 bp = (MpegTSBaseProgram *) tspad->program;
707 bp = mpegts_base_get_program ((MpegTSBase *) parse,
708 tspad->program_number);
712 if (packet->pid == bp->pmt_pid || bp->streams == NULL
713 || bp->streams[packet->pid]) {
714 GstBuffer *buf = mpegts_packet_to_buffer (packet);
715 /* push if there's no filter or if the pid is in the filter */
716 ret = gst_pad_push (tspad->pad, buf);
717 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
720 GST_DEBUG_OBJECT (parse, "Returning %s", gst_flow_get_name (ret));
726 pad_clear_for_push (GstPad * pad, MpegTSParse2 * parse)
728 MpegTSParsePad *tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
730 tspad->flow_return = GST_FLOW_NOT_LINKED;
731 tspad->pushed = FALSE;
735 mpegts_parse_push (MpegTSBase * base, MpegTSPacketizerPacket * packet,
736 GstMpegtsSection * section)
738 MpegTSParse2 *parse = (MpegTSParse2 *) base;
740 gboolean done = FALSE;
742 MpegTSParsePad *tspad;
747 GST_OBJECT_LOCK (parse);
748 srcpads = parse->srcpads;
750 /* clear tspad->pushed on pads */
751 g_list_foreach (srcpads, (GFunc) pad_clear_for_push, parse);
753 ret = GST_FLOW_NOT_LINKED;
757 /* Get cookie and source pads list */
758 pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
759 if (G_LIKELY (srcpads)) {
760 pad = GST_PAD_CAST (srcpads->data);
763 GST_OBJECT_UNLOCK (parse);
765 buf = mpegts_packet_to_buffer (packet);
766 ret = mpegts_parse_have_buffer (base, buf);
768 while (pad && !done) {
769 tspad = gst_pad_get_element_private (pad);
771 if (G_LIKELY (!tspad->pushed)) {
774 mpegts_parse_tspad_push_section (parse, tspad, section, packet);
776 tspad->flow_return = mpegts_parse_tspad_push (parse, tspad, packet);
778 tspad->pushed = TRUE;
780 if (G_UNLIKELY (tspad->flow_return != GST_FLOW_OK
781 && tspad->flow_return != GST_FLOW_NOT_LINKED)) {
782 /* return the error upstream */
783 ret = tspad->flow_return;
789 if (ret == GST_FLOW_NOT_LINKED)
790 ret = tspad->flow_return;
792 g_object_unref (pad);
794 if (G_UNLIKELY (!done)) {
795 GST_OBJECT_LOCK (parse);
796 if (G_UNLIKELY (pads_cookie != GST_ELEMENT_CAST (parse)->pads_cookie)) {
798 GST_DEBUG ("resync");
799 pads_cookie = GST_ELEMENT_CAST (parse)->pads_cookie;
800 srcpads = parse->srcpads;
802 GST_DEBUG ("getting next pad");
804 srcpads = g_list_next (srcpads);
808 pad = GST_PAD_CAST (srcpads->data);
812 GST_OBJECT_UNLOCK (parse);
820 mpegts_parse_inspect_packet (MpegTSBase * base, MpegTSPacketizerPacket * packet)
822 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
823 GST_LOG ("pid 0x%04x pusi:%d, afc:%d, cont:%d, payload:%p PCR %"
824 G_GUINT64_FORMAT, packet->pid, packet->payload_unit_start_indicator,
825 packet->scram_afc_cc & 0x30,
826 FLAGS_CONTINUITY_COUNTER (packet->scram_afc_cc), packet->payload,
829 /* Store the PCR if desired */
830 if (parse->current_pcr == GST_CLOCK_TIME_NONE &&
831 packet->afc_flags & MPEGTS_AFC_PCR_FLAG) {
832 /* Take this as the pcr_pid if set to auto-select */
833 if (parse->pcr_pid == -1)
834 parse->pcr_pid = packet->pid;
835 /* Check the PCR-PID matches the program we want for multiple programs */
836 if (parse->pcr_pid == packet->pid) {
837 parse->current_pcr = mpegts_packetizer_pts_to_ts (base->packetizer,
838 PCRTIME_TO_GSTTIME (packet->pcr), parse->pcr_pid);
839 GST_DEBUG ("Got new PCR %" GST_TIME_FORMAT " raw %" G_GUINT64_FORMAT,
840 GST_TIME_ARGS (parse->current_pcr), packet->pcr);
841 if (parse->base_pcr == GST_CLOCK_TIME_NONE) {
842 parse->base_pcr = parse->current_pcr;
849 get_pending_timestamp_diff (MpegTSParse2 * parse)
852 GstClockTime first_ts, last_ts;
854 if (parse->pending_buffers == NULL)
855 return GST_CLOCK_TIME_NONE;
857 l = g_list_last (parse->pending_buffers);
858 first_ts = GST_BUFFER_PTS (l->data);
859 if (first_ts == GST_CLOCK_TIME_NONE)
860 return GST_CLOCK_TIME_NONE;
862 l = g_list_first (parse->pending_buffers);
863 last_ts = GST_BUFFER_PTS (l->data);
864 if (last_ts == GST_CLOCK_TIME_NONE)
865 return GST_CLOCK_TIME_NONE;
867 return last_ts - first_ts;
871 drain_pending_buffers (MpegTSParse2 * parse, gboolean drain_all)
873 GstFlowReturn ret = GST_FLOW_OK;
874 GstClockTime start_ts;
875 GstClockTime pcr = GST_CLOCK_TIME_NONE;
876 GstClockTime pcr_diff = 0;
877 gsize pcr_bytes, bytes_since_pcr, pos;
879 GList *l, *end = NULL;
881 if (parse->pending_buffers == NULL)
882 return GST_FLOW_OK; /* Nothing to push */
886 * 1 We get a buffer with no PCR -> it's the head of the list
887 * -> Do nothing, unless it's EOS
888 * 2 We get a buffer with a PCR, it's the first PCR we've seen, and belongs
889 * to the buffer at the head of the list
890 * -> Push any buffers in the list except the head,
891 * using a smoothing of their timestamps to land at the PCR
892 * -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
893 * 3 It's EOS (drain_all == TRUE, current_pcr == NONE)
894 * -> Push any buffers in the list using a smoothing of their timestamps
895 * starting at the previous PCR or first TS
896 * 4 We get a buffer with a PCR, and have a previous PCR
897 * -> If distance > smoothing_latency,
898 * output buffers except the last in the pending queue using
899 * piecewise-linear timestamps
900 * -> store new PCR as the previous PCR, bytes_since_pcr = sizeof (buffer);
904 if (!GST_CLOCK_TIME_IS_VALID (parse->current_pcr) && !drain_all)
907 if (GST_CLOCK_TIME_IS_VALID (parse->current_pcr)) {
908 pcr = parse->current_pcr;
909 parse->current_pcr = GST_CLOCK_TIME_NONE;
912 /* The bytes of the last buffer are after the PCR */
913 buffer = GST_BUFFER (g_list_nth_data (parse->pending_buffers, 0));
914 bytes_since_pcr = gst_buffer_get_size (buffer);
916 pcr_bytes = parse->bytes_since_pcr - bytes_since_pcr;
919 end = g_list_first (parse->pending_buffers);
922 if (!GST_CLOCK_TIME_IS_VALID (parse->previous_pcr)) {
923 pcr_diff = get_pending_timestamp_diff (parse);
925 /* Calculate the start_ts that ends at the end timestamp */
926 start_ts = GST_CLOCK_TIME_NONE;
928 start_ts = GST_BUFFER_PTS (GST_BUFFER (end->data));
929 if (start_ts > pcr_diff)
930 start_ts -= pcr_diff;
932 } else if (drain_all) { /* Case 3 */
933 start_ts = parse->previous_pcr;
934 pcr_diff = get_pending_timestamp_diff (parse);
935 } else { /* Case 4 */
936 start_ts = parse->previous_pcr;
937 if (GST_CLOCK_TIME_IS_VALID (pcr) && pcr > start_ts)
938 pcr_diff = GST_CLOCK_DIFF (start_ts, pcr);
940 /* Make sure PCR observations are sufficiently far apart */
941 if (drain_all == FALSE && pcr_diff < parse->smoothing_latency)
945 GST_INFO_OBJECT (parse, "Pushing buffers - startTS %" GST_TIME_FORMAT
946 " duration %" GST_TIME_FORMAT " %" G_GSIZE_FORMAT " bytes",
947 GST_TIME_ARGS (start_ts), GST_TIME_ARGS (pcr_diff), pcr_bytes);
949 /* Now, push buffers out pacing timestamps over pcr_diff time and pcr_bytes */
951 l = g_list_last (parse->pending_buffers);
954 GstClockTime out_ts = start_ts;
956 buffer = gst_buffer_make_writable (GST_BUFFER (l->data));
958 if (out_ts != GST_CLOCK_TIME_NONE && pcr_diff != GST_CLOCK_TIME_NONE &&
960 out_ts += gst_util_uint64_scale (pcr_diff, pos, pcr_bytes);
962 pos += gst_buffer_get_size (buffer);
964 GST_DEBUG_OBJECT (parse,
965 "InputTS %" GST_TIME_FORMAT " out %" GST_TIME_FORMAT,
966 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)), GST_TIME_ARGS (out_ts));
968 GST_BUFFER_PTS (buffer) = out_ts + parse->ts_offset;
969 GST_BUFFER_DTS (buffer) = out_ts + parse->ts_offset;
970 if (ret == GST_FLOW_OK) {
972 enqueue_and_maybe_push_buffer (parse, parse->srcpad,
973 &parse->ts_adapter, buffer);
975 gst_buffer_unref (buffer);
978 /* Free this list node and move to the next */
979 p = g_list_previous (l);
980 parse->pending_buffers = g_list_delete_link (parse->pending_buffers, l);
985 empty_adapter_into_pad (&parse->ts_adapter, parse->srcpad);
988 parse->pending_buffers = end;
989 parse->bytes_since_pcr = bytes_since_pcr;
990 parse->previous_pcr = pcr;
995 mpegts_parse_have_buffer (MpegTSBase * base, GstBuffer * buffer)
997 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
998 GstFlowReturn ret = GST_FLOW_OK;
1000 GST_LOG_OBJECT (parse, "Received buffer %" GST_PTR_FORMAT, buffer);
1002 /* Assume all packets have equal size */
1003 if (parse->alignment > 0 &&
1004 base->packetizer->packet_size != MPEGTS_NORMAL_PACKETSIZE) {
1008 gst_buffer_map (buffer, &map, GST_MAP_READ);
1011 parse->header = GST_READ_UINT32_BE (data);
1012 gst_buffer_unmap (buffer, &map);
1015 if (parse->current_pcr != GST_CLOCK_TIME_NONE) {
1016 GST_DEBUG_OBJECT (parse,
1017 "InputTS %" GST_TIME_FORMAT " PCR %" GST_TIME_FORMAT,
1018 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
1019 GST_TIME_ARGS (parse->current_pcr));
1022 if (parse->set_timestamps || parse->first) {
1023 parse->pending_buffers = g_list_prepend (parse->pending_buffers, buffer);
1024 parse->bytes_since_pcr += gst_buffer_get_size (buffer);
1028 if (!prepare_src_pad (base, parse))
1031 if (parse->pending_buffers != NULL) {
1032 /* Don't keep pending_buffers if not setting output timestamps */
1033 gboolean drain_all = (parse->set_timestamps == FALSE);
1034 ret = drain_pending_buffers (parse, drain_all);
1035 if (ret != GST_FLOW_OK) {
1037 gst_buffer_unref (buffer);
1043 enqueue_and_maybe_push_buffer (parse, parse->srcpad, &parse->ts_adapter,
1050 empty_pad (GstPad * pad, MpegTSParse2 * parse)
1052 MpegTSParsePad *tspad = (MpegTSParsePad *) gst_pad_get_element_private (pad);
1055 ret = empty_adapter_into_pad (&tspad->ts_adapter, tspad->pad);
1056 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
1059 static GstFlowReturn
1060 mpegts_parse_input_done (MpegTSBase * base, GstBuffer * buffer)
1062 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
1063 GstFlowReturn ret = GST_FLOW_OK;
1065 if (!prepare_src_pad (base, parse))
1068 if (parse->alignment == 0) {
1069 ret = empty_adapter_into_pad (&parse->ts_adapter, parse->srcpad);
1070 ret = gst_flow_combiner_update_flow (parse->flowcombiner, ret);
1071 g_list_foreach (parse->srcpads, (GFunc) empty_pad, parse);
1076 static MpegTSParsePad *
1077 find_pad_for_program (MpegTSParse2 * parse, guint program_number)
1081 for (tmp = parse->srcpads; tmp; tmp = tmp->next) {
1082 MpegTSParsePad *tspad = gst_pad_get_element_private ((GstPad *) tmp->data);
1084 if (tspad->program_number == program_number)
1092 mpegts_parse_program_started (MpegTSBase * base, MpegTSBaseProgram * program)
1094 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
1095 MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
1096 MpegTSParsePad *tspad;
1098 /* If we have a request pad for that program, activate it */
1099 tspad = find_pad_for_program (parse, program->program_number);
1102 tspad->program = parseprogram;
1103 parseprogram->tspad = tspad;
1108 mpegts_parse_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program)
1110 MpegTSParse2 *parse = GST_MPEGTS_PARSE (base);
1111 MpegTSParseProgram *parseprogram = (MpegTSParseProgram *) program;
1112 MpegTSParsePad *tspad;
1114 /* If we have a request pad for that program, activate it */
1115 tspad = find_pad_for_program (parse, program->program_number);
1118 tspad->program = NULL;
1119 parseprogram->tspad = NULL;
1122 parse->pcr_pid = -1;
1123 parse->ts_offset += parse->current_pcr - parse->base_pcr;
1124 parse->base_pcr = GST_CLOCK_TIME_NONE;
1128 mpegts_parse_src_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
1130 MpegTSParse2 *parse = GST_MPEGTS_PARSE (parent);
1133 switch (GST_QUERY_TYPE (query)) {
1134 case GST_QUERY_LATENCY:
1136 if ((res = gst_pad_peer_query (((MpegTSBase *) parse)->sinkpad, query))) {
1138 GstClockTime min_latency, max_latency;
1140 gst_query_parse_latency (query, &is_live, &min_latency, &max_latency);
1142 GstClockTime extra_latency = TS_LATENCY * GST_MSECOND;
1143 if (parse->set_timestamps) {
1144 extra_latency = MAX (extra_latency, parse->smoothing_latency);
1146 min_latency += extra_latency;
1147 if (max_latency != GST_CLOCK_TIME_NONE)
1148 max_latency += extra_latency;
1151 gst_query_set_latency (query, is_live, min_latency, max_latency);
1156 res = gst_pad_query_default (pad, parent, query);
1162 gst_mpegtsparse_plugin_init (GstPlugin * plugin)
1164 GST_DEBUG_CATEGORY_INIT (mpegts_parse_debug, "tsparse", 0,
1165 "MPEG transport stream parser");
1167 return gst_element_register (plugin, "tsparse",
1168 GST_RANK_NONE, GST_TYPE_MPEGTS_PARSE);