2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2001 Thomas <thomas@apestaart.org>
4 * 2005,2006 Wim Taymans <wim@fluendo.com>
6 * adder.c: Adder element, N in, one out, samples are added
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., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
24 * SECTION:element-adder
26 * The adder allows to mix several streams into one by adding the data.
27 * Mixed data is clamped to the min/max values of the data format.
29 * The adder currently mixes all data received on the sinkpads as soon as
30 * possible without trying to synchronize the streams.
33 * <title>Example launch line</title>
35 * gst-launch audiotestsrc freq=100 ! adder name=mix ! audioconvert ! alsasink audiotestsrc freq=500 ! mix.
36 * ]| This pipeline produces two sine waves mixed together.
39 * Last reviewed on 2006-05-09 (0.10.7)
41 /* Element-Checklist-Version: 5 */
48 #include <gst/audio/audio.h>
49 #include <string.h> /* strcmp */
50 #include "gstadderorc.h"
52 /* highest positive/lowest negative x-bit value we can use for clamping */
53 #define MAX_INT_32 ((gint32) (0x7fffffff))
54 #define MAX_INT_16 ((gint16) (0x7fff))
55 #define MAX_INT_8 ((gint8) (0x7f))
56 #define MAX_UINT_32 ((guint32)(0xffffffff))
57 #define MAX_UINT_16 ((guint16)(0xffff))
58 #define MAX_UINT_8 ((guint8) (0xff))
60 #define MIN_INT_32 ((gint32) (0x80000000))
61 #define MIN_INT_16 ((gint16) (0x8000))
62 #define MIN_INT_8 ((gint8) (0x80))
63 #define MIN_UINT_32 ((guint32)(0x00000000))
64 #define MIN_UINT_16 ((guint16)(0x0000))
65 #define MIN_UINT_8 ((guint8) (0x00))
73 #define GST_CAT_DEFAULT gst_adder_debug
74 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
76 /* elementfactory information */
78 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
80 GST_AUDIO_CAPS_MAKE ("{ S32LE, U32LE, S16LE, U16LE, S8, U8, F32LE, F64LE }") \
81 ", layout = (string) { interleaved, non-interleaved }"
84 GST_AUDIO_CAPS_MAKE ("{ S32BE, U32BE, S16BE, U16BE, S8, U8, F32BE, F64BE }") \
85 ", layout = (string) { interleaved, non-interleaved }"
88 static GstStaticPadTemplate gst_adder_src_template =
89 GST_STATIC_PAD_TEMPLATE ("src",
92 GST_STATIC_CAPS (CAPS)
95 static GstStaticPadTemplate gst_adder_sink_template =
96 GST_STATIC_PAD_TEMPLATE ("sink_%u",
99 GST_STATIC_CAPS (CAPS)
102 #define gst_adder_parent_class parent_class
103 G_DEFINE_TYPE (GstAdder, gst_adder, GST_TYPE_ELEMENT);
105 static void gst_adder_dispose (GObject * object);
106 static void gst_adder_set_property (GObject * object, guint prop_id,
107 const GValue * value, GParamSpec * pspec);
108 static void gst_adder_get_property (GObject * object, guint prop_id,
109 GValue * value, GParamSpec * pspec);
111 static gboolean gst_adder_setcaps (GstAdder * adder, GstPad * pad,
113 static gboolean gst_adder_src_query (GstPad * pad, GstObject * parent,
115 static gboolean gst_adder_sink_query (GstPad * pad, GstObject * parent,
117 static gboolean gst_adder_src_event (GstPad * pad, GstObject * parent,
119 static gboolean gst_adder_sink_event (GstCollectPads * pads,
120 GstCollectData * pad, GstEvent * event, gpointer user_data);
122 static GstPad *gst_adder_request_new_pad (GstElement * element,
123 GstPadTemplate * temp, const gchar * unused, const GstCaps * caps);
124 static void gst_adder_release_pad (GstElement * element, GstPad * pad);
126 static GstStateChangeReturn gst_adder_change_state (GstElement * element,
127 GstStateChange transition);
129 static GstFlowReturn gst_adder_do_clip (GstCollectPads * pads,
130 GstCollectData * data, GstBuffer * buffer, GstBuffer ** out,
132 static GstFlowReturn gst_adder_collected (GstCollectPads * pads,
135 /* non-clipping versions (for float) */
136 #define MAKE_FUNC_NC(name,type) \
137 static void name (type *out, type *in, gint samples) { \
139 for (i = 0; i < samples; i++) \
144 MAKE_FUNC_NC (adder_orc_add_float64, gdouble)
147 /* we can only accept caps that we and downstream can handle.
148 * if we have filtercaps set, use those to constrain the target caps.
151 gst_adder_sink_getcaps (GstPad * pad, GstCaps * filter)
154 GstCaps *result, *peercaps, *sinkcaps, *filter_caps;
156 adder = GST_ADDER (GST_PAD_PARENT (pad));
158 GST_OBJECT_LOCK (adder);
160 if ((filter_caps = adder->filter_caps)) {
163 gst_caps_intersect_full (filter, filter_caps,
164 GST_CAPS_INTERSECT_FIRST);
166 gst_caps_ref (filter_caps);
168 filter_caps = filter ? gst_caps_ref (filter) : NULL;
170 GST_OBJECT_UNLOCK (adder);
172 if (filter_caps && gst_caps_is_empty (filter_caps)) {
173 GST_WARNING_OBJECT (pad, "Empty filter caps");
177 /* get the downstream possible caps */
178 peercaps = gst_pad_peer_query_caps (adder->srcpad, filter_caps);
180 /* get the allowed caps on this sinkpad */
181 sinkcaps = gst_pad_get_current_caps (pad);
182 if (sinkcaps == NULL) {
183 sinkcaps = gst_pad_get_pad_template_caps (pad);
185 sinkcaps = gst_caps_new_any ();
189 /* if the peer has caps, intersect */
190 GST_DEBUG_OBJECT (adder, "intersecting peer and template caps");
192 gst_caps_intersect_full (peercaps, sinkcaps, GST_CAPS_INTERSECT_FIRST);
193 gst_caps_unref (peercaps);
194 gst_caps_unref (sinkcaps);
196 /* the peer has no caps (or there is no peer), just use the allowed caps
197 * of this sinkpad. */
198 /* restrict with filter-caps if any */
200 GST_DEBUG_OBJECT (adder, "no peer caps, using filtered sinkcaps");
202 gst_caps_intersect_full (filter_caps, sinkcaps,
203 GST_CAPS_INTERSECT_FIRST);
204 gst_caps_unref (sinkcaps);
206 GST_DEBUG_OBJECT (adder, "no peer caps, using sinkcaps");
212 gst_caps_unref (filter_caps);
214 GST_LOG_OBJECT (adder, "getting caps on pad %p,%s to %" GST_PTR_FORMAT, pad,
215 GST_PAD_NAME (pad), result);
221 gst_adder_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
223 gboolean res = FALSE;
225 switch (GST_QUERY_TYPE (query)) {
228 GstCaps *filter, *caps;
230 gst_query_parse_caps (query, &filter);
231 caps = gst_adder_sink_getcaps (pad, filter);
232 gst_query_set_caps_result (query, caps);
233 gst_caps_unref (caps);
238 res = gst_pad_query_default (pad, parent, query);
251 setcapsfunc (const GValue * item, IterData * data)
253 GstPad *otherpad = g_value_get_object (item);
255 if (otherpad != data->pad) {
256 GST_LOG_OBJECT (data->pad, "calling set_caps with %" GST_PTR_FORMAT,
258 gst_pad_set_caps (data->pad, data->caps);
259 gst_pad_use_fixed_caps (data->pad);
263 /* the first caps we receive on any of the sinkpads will define the caps for all
264 * the other sinkpads because we can only mix streams with the same caps.
267 gst_adder_setcaps (GstAdder * adder, GstPad * pad, GstCaps * caps)
270 GstIteratorResult ires;
274 /* this gets called recursively due to gst_iterator_foreach calling
275 * gst_pad_set_caps() */
276 if (adder->in_setcaps)
279 /* don't allow reconfiguration for now; there's still a race between the
280 * different upstream threads doing query_caps + accept_caps + sending
281 * (possibly different) CAPS events, but there's not much we can do about
282 * that, upstream needs to deal with it. */
283 if (adder->current_caps != NULL) {
284 /* FIXME: not quite right for optional fields such as channel-mask, which
285 * may or may not be present for mono/stereo */
286 if (gst_caps_is_equal (caps, adder->current_caps)) {
289 GST_DEBUG_OBJECT (pad, "got input caps %" GST_PTR_FORMAT ", but "
290 "current caps are %" GST_PTR_FORMAT, caps, adder->current_caps);
291 gst_pad_push_event (pad, gst_event_new_reconfigure ());
296 GST_INFO_OBJECT (pad, "setting caps to %" GST_PTR_FORMAT, caps);
298 adder->current_caps = gst_caps_ref (caps);
299 gst_pad_push_event (adder->srcpad, gst_event_new_caps (adder->current_caps));
301 it = gst_element_iterate_pads (GST_ELEMENT_CAST (adder));
303 /* FIXME, see if the other pads can accept the format. Also lock the
304 * format on the other pads to this new format. */
308 adder->in_setcaps = TRUE;
311 ires = gst_iterator_foreach (it, (GstIteratorForeachFunction) setcapsfunc,
315 case GST_ITERATOR_RESYNC:
316 gst_iterator_resync (it);
323 adder->in_setcaps = FALSE;
324 gst_iterator_free (it);
326 GST_INFO_OBJECT (pad, "handle caps change to %" GST_PTR_FORMAT, caps);
328 if (!gst_audio_info_from_caps (&adder->info, caps))
331 switch (GST_AUDIO_INFO_FORMAT (&adder->info)) {
332 case GST_AUDIO_FORMAT_S8:
333 adder->func = (GstAdderFunction) adder_orc_add_int8;
335 case GST_AUDIO_FORMAT_U8:
336 adder->func = (GstAdderFunction) adder_orc_add_uint8;
338 case GST_AUDIO_FORMAT_S16:
339 adder->func = (GstAdderFunction) adder_orc_add_int16;
341 case GST_AUDIO_FORMAT_U16:
342 adder->func = (GstAdderFunction) adder_orc_add_uint16;
344 case GST_AUDIO_FORMAT_S32:
345 adder->func = (GstAdderFunction) adder_orc_add_int32;
347 case GST_AUDIO_FORMAT_U32:
348 adder->func = (GstAdderFunction) adder_orc_add_uint32;
350 case GST_AUDIO_FORMAT_F32:
351 adder->func = (GstAdderFunction) adder_orc_add_float32;
353 case GST_AUDIO_FORMAT_F64:
354 adder->func = (GstAdderFunction) adder_orc_add_float64;
364 GST_WARNING_OBJECT (adder, "invalid format set as caps");
369 /* FIXME, the duration query should reflect how long you will produce
370 * data, that is the amount of stream time until you will emit EOS.
372 * For synchronized mixing this is always the max of all the durations
373 * of upstream since we emit EOS when all of them finished.
375 * We don't do synchronized mixing so this really depends on where the
376 * streams where punched in and what their relative offsets are against
377 * eachother which we can get from the first timestamps we see.
379 * When we add a new stream (or remove a stream) the duration might
380 * also become invalid again and we need to post a new DURATION
381 * message to notify this fact to the parent.
382 * For now we take the max of all the upstream elements so the simple
383 * cases work at least somewhat.
386 gst_adder_query_duration (GstAdder * adder, GstQuery * query)
393 GValue item = { 0, };
396 gst_query_parse_duration (query, &format, NULL);
402 it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
404 GstIteratorResult ires;
406 ires = gst_iterator_next (it, &item);
408 case GST_ITERATOR_DONE:
411 case GST_ITERATOR_OK:
413 GstPad *pad = g_value_get_object (&item);
416 /* ask sink peer for duration */
417 res &= gst_pad_peer_query_duration (pad, format, &duration);
418 /* take max from all valid return values */
420 /* valid unknown length, stop searching */
421 if (duration == -1) {
425 /* else see if bigger than current max */
426 else if (duration > max)
429 g_value_reset (&item);
432 case GST_ITERATOR_RESYNC:
435 gst_iterator_resync (it);
443 g_value_unset (&item);
444 gst_iterator_free (it);
447 /* and store the max */
448 GST_DEBUG_OBJECT (adder, "Total duration in format %s: %"
449 GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (max));
450 gst_query_set_duration (query, format, max);
457 gst_adder_query_latency (GstAdder * adder, GstQuery * query)
459 GstClockTime min, max;
464 GValue item = { 0, };
471 max = GST_CLOCK_TIME_NONE;
473 /* Take maximum of all latency values */
474 it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
476 GstIteratorResult ires;
478 ires = gst_iterator_next (it, &item);
480 case GST_ITERATOR_DONE:
483 case GST_ITERATOR_OK:
485 GstPad *pad = g_value_get_object (&item);
487 GstClockTime min_cur, max_cur;
490 peerquery = gst_query_new_latency ();
492 /* Ask peer for latency */
493 res &= gst_pad_peer_query (pad, peerquery);
495 /* take max from all valid return values */
497 gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur);
502 if (max_cur != GST_CLOCK_TIME_NONE &&
503 ((max != GST_CLOCK_TIME_NONE && max_cur > max) ||
504 (max == GST_CLOCK_TIME_NONE)))
507 live = live || live_cur;
510 gst_query_unref (peerquery);
511 g_value_reset (&item);
514 case GST_ITERATOR_RESYNC:
517 max = GST_CLOCK_TIME_NONE;
519 gst_iterator_resync (it);
527 g_value_unset (&item);
528 gst_iterator_free (it);
531 /* store the results */
532 GST_DEBUG_OBJECT (adder, "Calculated total latency: live %s, min %"
533 GST_TIME_FORMAT ", max %" GST_TIME_FORMAT,
534 (live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max));
535 gst_query_set_latency (query, live, min, max);
542 gst_adder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
544 GstAdder *adder = GST_ADDER (parent);
545 gboolean res = FALSE;
547 switch (GST_QUERY_TYPE (query)) {
548 case GST_QUERY_POSITION:
552 gst_query_parse_position (query, &format, NULL);
555 case GST_FORMAT_TIME:
556 /* FIXME, bring to stream time, might be tricky */
557 gst_query_set_position (query, format, adder->segment.position);
560 case GST_FORMAT_DEFAULT:
561 gst_query_set_position (query, format, adder->offset);
569 case GST_QUERY_DURATION:
570 res = gst_adder_query_duration (adder, query);
572 case GST_QUERY_LATENCY:
573 res = gst_adder_query_latency (adder, query);
576 /* FIXME, needs a custom query handler because we have multiple
578 res = gst_pad_query_default (pad, parent, query);
594 forward_event_func (const GValue * val, GValue * ret, EventData * data)
596 GstPad *pad = g_value_get_object (val);
597 GstEvent *event = data->event;
600 gst_event_ref (event);
601 GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
602 peer = gst_pad_get_peer (pad);
603 /* collect pad might have been set flushing,
604 * so bypass core checking that and send directly to peer */
605 if (!peer || !gst_pad_send_event (peer, event)) {
607 gst_event_unref (event);
608 GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.",
609 event, GST_EVENT_TYPE_NAME (event));
610 /* quick hack to unflush the pads, ideally we need a way to just unflush
611 * this single collect pad */
613 gst_pad_send_event (pad, gst_event_new_flush_stop (TRUE));
615 g_value_set_boolean (ret, TRUE);
616 GST_LOG_OBJECT (pad, "Sent event %p (%s).",
617 event, GST_EVENT_TYPE_NAME (event));
620 gst_object_unref (peer);
622 /* continue on other pads, even if one failed */
626 /* forwards the event to all sinkpads, takes ownership of the
629 * Returns: TRUE if the event could be forwarded on all
633 forward_event (GstAdder * adder, GstEvent * event, gboolean flush)
637 GstIteratorResult ires;
641 GST_LOG_OBJECT (adder, "Forwarding event %p (%s)", event,
642 GST_EVENT_TYPE_NAME (event));
647 g_value_init (&vret, G_TYPE_BOOLEAN);
648 g_value_set_boolean (&vret, FALSE);
649 it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
652 gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func,
655 case GST_ITERATOR_RESYNC:
656 GST_WARNING ("resync");
657 gst_iterator_resync (it);
658 g_value_set_boolean (&vret, TRUE);
660 case GST_ITERATOR_OK:
661 case GST_ITERATOR_DONE:
662 ret = g_value_get_boolean (&vret);
670 gst_iterator_free (it);
671 GST_LOG_OBJECT (adder, "Forwarded event %p (%s), ret=%d", event,
672 GST_EVENT_TYPE_NAME (event), ret);
673 gst_event_unref (event);
679 gst_adder_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
684 adder = GST_ADDER (parent);
686 GST_DEBUG_OBJECT (pad, "Got %s event on src pad",
687 GST_EVENT_TYPE_NAME (event));
689 switch (GST_EVENT_TYPE (event)) {
694 GstSeekType curtype, endtype;
698 /* parse the seek parameters */
699 gst_event_parse_seek (event, &rate, NULL, &flags, &curtype,
700 &cur, &endtype, &end);
702 if ((curtype != GST_SEEK_TYPE_NONE) && (curtype != GST_SEEK_TYPE_SET)) {
704 GST_DEBUG_OBJECT (adder,
705 "seeking failed, unhandled seek type for start: %d", curtype);
708 if ((endtype != GST_SEEK_TYPE_NONE) && (endtype != GST_SEEK_TYPE_SET)) {
710 GST_DEBUG_OBJECT (adder,
711 "seeking failed, unhandled seek type for end: %d", endtype);
715 flush = (flags & GST_SEEK_FLAG_FLUSH) == GST_SEEK_FLAG_FLUSH;
717 /* check if we are flushing */
719 /* flushing seek, start flush downstream, the flush will be done
720 * when all pads received a FLUSH_STOP.
721 * Make sure we accept nothing anymore and return WRONG_STATE.
722 * We send a flush-start before, to ensure no streaming is done
723 * as we need to take the stream lock.
725 gst_pad_push_event (adder->srcpad, gst_event_new_flush_start ());
726 gst_collect_pads_set_flushing (adder->collect, TRUE);
728 /* We can't send FLUSH_STOP here since upstream could start pushing data
729 * after we unlock adder->collect.
730 * We set flush_stop_pending to TRUE instead and send FLUSH_STOP after
731 * forwarding the seek upstream or from gst_adder_collected,
732 * whichever happens first.
734 g_atomic_int_set (&adder->flush_stop_pending, TRUE);
736 GST_DEBUG_OBJECT (adder, "handling seek event: %" GST_PTR_FORMAT, event);
738 /* now wait for the collected to be finished and mark a new
739 * segment. After we have the lock, no collect function is running and no
740 * new collect function will be called for as long as we're flushing. */
741 GST_COLLECT_PADS_STREAM_LOCK (adder->collect);
742 adder->segment.rate = rate;
743 if (curtype == GST_SEEK_TYPE_SET)
744 adder->segment.start = cur;
746 adder->segment.start = 0;
747 if (endtype == GST_SEEK_TYPE_SET)
748 adder->segment.stop = end;
750 adder->segment.stop = GST_CLOCK_TIME_NONE;
752 /* Yes, we need to call _set_flushing again *WHEN* the streaming threads
753 * have stopped so that the cookie gets properly updated. */
754 gst_collect_pads_set_flushing (adder->collect, TRUE);
756 GST_COLLECT_PADS_STREAM_UNLOCK (adder->collect);
757 GST_DEBUG_OBJECT (adder, "forwarding seek event: %" GST_PTR_FORMAT,
760 /* we're forwarding seek to all upstream peers and wait for one to reply
761 * with a newsegment-event before we send a newsegment-event downstream */
762 g_atomic_int_set (&adder->wait_for_new_segment, TRUE);
763 result = forward_event (adder, event, flush);
765 /* seek failed. maybe source is a live source. */
766 GST_DEBUG_OBJECT (adder, "seeking failed");
768 if (g_atomic_int_compare_and_exchange (&adder->flush_stop_pending,
770 GST_DEBUG_OBJECT (adder, "pending flush stop");
771 gst_pad_push_event (adder->srcpad, gst_event_new_flush_stop (TRUE));
776 /* QoS might be tricky */
778 gst_event_unref (event);
780 case GST_EVENT_NAVIGATION:
781 /* navigation is rather pointless. */
783 gst_event_unref (event);
786 /* just forward the rest for now */
787 GST_DEBUG_OBJECT (adder, "forward unhandled event: %s",
788 GST_EVENT_TYPE_NAME (event));
789 result = forward_event (adder, event, FALSE);
799 gst_adder_sink_event (GstCollectPads * pads, GstCollectData * pad,
800 GstEvent * event, gpointer user_data)
802 GstAdder *adder = GST_ADDER (user_data);
803 gboolean res = TRUE, discard = FALSE;
805 GST_DEBUG_OBJECT (pad->pad, "Got %s event on sink pad",
806 GST_EVENT_TYPE_NAME (event));
808 switch (GST_EVENT_TYPE (event)) {
813 gst_event_parse_caps (event, &caps);
814 res = gst_adder_setcaps (adder, pad->pad, caps);
815 gst_event_unref (event);
818 case GST_EVENT_FLUSH_STOP:
819 /* we received a flush-stop. We will only forward it when
820 * flush_stop_pending is set, and we will unset it then.
822 if (g_atomic_int_compare_and_exchange (&adder->flush_stop_pending,
824 g_atomic_int_set (&adder->new_segment_pending, TRUE);
825 GST_DEBUG_OBJECT (pad->pad, "forwarding flush stop");
828 GST_DEBUG_OBJECT (pad->pad, "eating flush stop");
830 /* Clear pending tags */
831 if (adder->pending_events) {
832 g_list_foreach (adder->pending_events, (GFunc) gst_event_unref, NULL);
833 g_list_free (adder->pending_events);
834 adder->pending_events = NULL;
838 /* collect tags here so we can push them out when we collect data */
839 adder->pending_events = g_list_append (adder->pending_events, event);
842 case GST_EVENT_SEGMENT:
843 if (g_atomic_int_compare_and_exchange (&adder->wait_for_new_segment,
845 /* make sure we push a new segment, to inform about new basetime
846 * see FIXME in gst_adder_collected() */
847 g_atomic_int_set (&adder->new_segment_pending, TRUE);
855 if (G_LIKELY (event))
856 return gst_collect_pads_event_default (pads, pad, event, discard);
862 gst_adder_class_init (GstAdderClass * klass)
864 GObjectClass *gobject_class = (GObjectClass *) klass;
865 GstElementClass *gstelement_class = (GstElementClass *) klass;
867 gobject_class->set_property = gst_adder_set_property;
868 gobject_class->get_property = gst_adder_get_property;
869 gobject_class->dispose = gst_adder_dispose;
876 g_object_class_install_property (gobject_class, PROP_FILTER_CAPS,
877 g_param_spec_boxed ("caps", "Target caps",
878 "Set target format for mixing (NULL means ANY). "
879 "Setting this property takes a reference to the supplied GstCaps "
880 "object.", GST_TYPE_CAPS,
881 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
883 gst_element_class_add_pad_template (gstelement_class,
884 gst_static_pad_template_get (&gst_adder_src_template));
885 gst_element_class_add_pad_template (gstelement_class,
886 gst_static_pad_template_get (&gst_adder_sink_template));
887 gst_element_class_set_static_metadata (gstelement_class, "Adder",
889 "Add N audio channels together",
890 "Thomas Vander Stichele <thomas at apestaart dot org>");
892 gstelement_class->request_new_pad =
893 GST_DEBUG_FUNCPTR (gst_adder_request_new_pad);
894 gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_adder_release_pad);
895 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_adder_change_state);
899 gst_adder_init (GstAdder * adder)
901 GstPadTemplate *template;
903 template = gst_static_pad_template_get (&gst_adder_src_template);
904 adder->srcpad = gst_pad_new_from_template (template, "src");
905 gst_object_unref (template);
907 gst_pad_set_query_function (adder->srcpad,
908 GST_DEBUG_FUNCPTR (gst_adder_src_query));
909 gst_pad_set_event_function (adder->srcpad,
910 GST_DEBUG_FUNCPTR (gst_adder_src_event));
911 GST_PAD_SET_PROXY_CAPS (adder->srcpad);
912 gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);
914 adder->current_caps = NULL;
915 gst_audio_info_init (&adder->info);
919 adder->filter_caps = NULL;
921 /* keep track of the sinkpads requested */
922 adder->collect = gst_collect_pads_new ();
923 gst_collect_pads_set_function (adder->collect,
924 GST_DEBUG_FUNCPTR (gst_adder_collected), adder);
925 gst_collect_pads_set_clip_function (adder->collect,
926 GST_DEBUG_FUNCPTR (gst_adder_do_clip), adder);
927 gst_collect_pads_set_event_function (adder->collect,
928 GST_DEBUG_FUNCPTR (gst_adder_sink_event), adder);
932 gst_adder_dispose (GObject * object)
934 GstAdder *adder = GST_ADDER (object);
936 if (adder->collect) {
937 gst_object_unref (adder->collect);
938 adder->collect = NULL;
940 gst_caps_replace (&adder->filter_caps, NULL);
941 gst_caps_replace (&adder->current_caps, NULL);
943 if (adder->pending_events) {
944 g_list_foreach (adder->pending_events, (GFunc) gst_event_unref, NULL);
945 g_list_free (adder->pending_events);
946 adder->pending_events = NULL;
949 G_OBJECT_CLASS (parent_class)->dispose (object);
953 gst_adder_set_property (GObject * object, guint prop_id,
954 const GValue * value, GParamSpec * pspec)
956 GstAdder *adder = GST_ADDER (object);
959 case PROP_FILTER_CAPS:{
960 GstCaps *new_caps = NULL;
962 const GstCaps *new_caps_val = gst_value_get_caps (value);
964 if (new_caps_val != NULL) {
965 new_caps = (GstCaps *) new_caps_val;
966 gst_caps_ref (new_caps);
969 GST_OBJECT_LOCK (adder);
970 old_caps = adder->filter_caps;
971 adder->filter_caps = new_caps;
972 GST_OBJECT_UNLOCK (adder);
975 gst_caps_unref (old_caps);
977 GST_DEBUG_OBJECT (adder, "set new caps %" GST_PTR_FORMAT, new_caps);
981 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
987 gst_adder_get_property (GObject * object, guint prop_id, GValue * value,
990 GstAdder *adder = GST_ADDER (object);
993 case PROP_FILTER_CAPS:
994 GST_OBJECT_LOCK (adder);
995 gst_value_set_caps (value, adder->filter_caps);
996 GST_OBJECT_UNLOCK (adder);
999 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1006 gst_adder_request_new_pad (GstElement * element, GstPadTemplate * templ,
1007 const gchar * unused, const GstCaps * caps)
1014 if (templ->direction != GST_PAD_SINK)
1017 adder = GST_ADDER (element);
1019 /* increment pad counter */
1020 padcount = g_atomic_int_add (&adder->padcount, 1);
1022 name = g_strdup_printf ("sink_%u", padcount);
1023 newpad = gst_pad_new_from_template (templ, name);
1024 GST_DEBUG_OBJECT (adder, "request new pad %s", name);
1027 gst_pad_set_query_function (newpad, GST_DEBUG_FUNCPTR (gst_adder_sink_query));
1028 gst_collect_pads_add_pad (adder->collect, newpad, sizeof (GstCollectData));
1030 /* takes ownership of the pad */
1031 if (!gst_element_add_pad (GST_ELEMENT (adder), newpad))
1039 g_warning ("gstadder: request new pad that is not a SINK pad\n");
1044 GST_DEBUG_OBJECT (adder, "could not add pad");
1045 gst_collect_pads_remove_pad (adder->collect, newpad);
1046 gst_object_unref (newpad);
1052 gst_adder_release_pad (GstElement * element, GstPad * pad)
1056 adder = GST_ADDER (element);
1058 GST_DEBUG_OBJECT (adder, "release pad %s:%s", GST_DEBUG_PAD_NAME (pad));
1061 gst_collect_pads_remove_pad (adder->collect, pad);
1062 gst_element_remove_pad (element, pad);
1065 static GstFlowReturn
1066 gst_adder_do_clip (GstCollectPads * pads, GstCollectData * data,
1067 GstBuffer * buffer, GstBuffer ** out, gpointer user_data)
1069 GstAdder *adder = GST_ADDER (user_data);
1072 rate = GST_AUDIO_INFO_RATE (&adder->info);
1073 bpf = GST_AUDIO_INFO_BPF (&adder->info);
1075 buffer = gst_audio_buffer_clip (buffer, &data->segment, rate, bpf);
1081 static GstFlowReturn
1082 gst_adder_collected (GstCollectPads * pads, gpointer user_data)
1085 * combine streams by adding data values
1087 * - this function is called when all pads have a buffer
1088 * - get available bytes on all pads.
1089 * - repeat for each input pad :
1090 * - read available bytes, copy or add to target buffer
1091 * - if there's an EOS event, remove the input channel
1092 * - push out the output buffer
1095 * - would be nice to have a mixing mode, where instead of adding we mix
1096 * - for float we could downscale after collect loop
1097 * - for int we need to downscale each input to avoid clipping or
1098 * mix into a temp (float) buffer and scale afterwards as well
1101 GSList *collected, *next = NULL;
1103 GstBuffer *outbuf = NULL, *gapbuf = NULL;
1104 GstMapInfo outmap = { NULL };
1107 gint64 next_timestamp;
1108 gint rate, bps, bpf;
1110 adder = GST_ADDER (user_data);
1113 if (G_UNLIKELY (adder->func == NULL))
1114 goto not_negotiated;
1116 if (g_atomic_int_compare_and_exchange (&adder->flush_stop_pending,
1118 GST_DEBUG_OBJECT (adder, "pending flush stop");
1119 gst_pad_push_event (adder->srcpad, gst_event_new_flush_stop (TRUE));
1122 /* get available bytes for reading, this can be 0 which could mean empty
1123 * buffers or EOS, which we will catch when we loop over the pads. */
1124 outsize = gst_collect_pads_available (pads);
1125 /* can only happen when no pads to collect or all EOS */
1129 rate = GST_AUDIO_INFO_RATE (&adder->info);
1130 bps = GST_AUDIO_INFO_BPS (&adder->info);
1131 bpf = GST_AUDIO_INFO_BPF (&adder->info);
1133 GST_LOG_OBJECT (adder,
1134 "starting to cycle through channels, %d bytes available (bps = %d, bpf = %d)",
1137 for (collected = pads->data; collected; collected = next) {
1138 GstCollectData *collect_data;
1142 /* take next to see if this is the last collectdata */
1143 next = g_slist_next (collected);
1145 collect_data = (GstCollectData *) collected->data;
1147 /* get a buffer of size bytes, if we get a buffer, it is at least outsize
1149 inbuf = gst_collect_pads_take_buffer (pads, collect_data, outsize);
1150 /* NULL means EOS or an empty buffer so we still need to flush in
1151 * case of an empty buffer. */
1152 if (inbuf == NULL) {
1153 GST_LOG_OBJECT (adder, "channel %p: no bytes available", collect_data);
1157 is_gap = GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP);
1159 /* Try to make an output buffer */
1160 if (outbuf == NULL) {
1161 /* if this is a gap buffer but we have some more pads to check, skip it.
1162 * If we are at the last buffer, take it, regardless if it is a GAP
1164 if (is_gap && next) {
1165 GST_DEBUG_OBJECT (adder, "skipping, non-last GAP buffer");
1166 /* we keep the GAP buffer, if we don't have anymore buffers (all pads
1167 * EOS, we can use this one as the output buffer. */
1171 gst_buffer_unref (inbuf);
1175 GST_LOG_OBJECT (adder, "channel %p: preparing output buffer of %d bytes",
1176 collect_data, outsize);
1178 /* make data and metadata writable, can simply return the inbuf when we
1179 * are the only one referencing this buffer. If this is the last (and
1180 * only) GAP buffer, it will automatically copy the GAP flag. */
1181 outbuf = gst_buffer_make_writable (inbuf);
1182 gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE);
1185 /* we had a previous output buffer, mix this non-GAP buffer */
1188 gst_buffer_map (inbuf, &inmap, GST_MAP_READ);
1190 /* all buffers should have outsize, there are no short buffers because we
1191 * asked for the max size above */
1192 g_assert (inmap.size == outmap.size);
1194 GST_LOG_OBJECT (adder, "channel %p: mixing %" G_GSIZE_FORMAT " bytes"
1195 " from data %p", collect_data, inmap.size, inmap.data);
1197 /* further buffers, need to add them */
1198 adder->func ((gpointer) outmap.data, (gpointer) inmap.data,
1200 gst_buffer_unmap (inbuf, &inmap);
1202 /* skip gap buffer */
1203 GST_LOG_OBJECT (adder, "channel %p: skipping GAP buffer", collect_data);
1205 gst_buffer_unref (inbuf);
1209 gst_buffer_unmap (outbuf, &outmap);
1211 if (outbuf == NULL) {
1212 /* no output buffer, reuse one of the GAP buffers then if we have one */
1214 GST_LOG_OBJECT (adder, "reusing GAP buffer %p", gapbuf);
1217 /* assume EOS otherwise, this should not happen, really */
1220 /* we had an output buffer, unref the gapbuffer we kept */
1221 gst_buffer_unref (gapbuf);
1223 if (g_atomic_int_compare_and_exchange (&adder->new_segment_pending, TRUE,
1227 /* FIXME, use rate/applied_rate as set on all sinkpads.
1228 * - currently we just set rate as received from last seek-event
1230 * When seeking we set the start and stop positions as given in the seek
1231 * event. We also adjust offset & timestamp accordingly.
1232 * This basically ignores all newsegments sent by upstream.
1234 event = gst_event_new_segment (&adder->segment);
1236 if (adder->segment.rate > 0.0) {
1237 adder->segment.position = adder->segment.start;
1239 adder->segment.position = adder->segment.stop;
1241 adder->offset = gst_util_uint64_scale (adder->segment.position,
1243 GST_INFO_OBJECT (adder, "seg_start %" G_GUINT64_FORMAT ", seg_end %"
1244 G_GUINT64_FORMAT, adder->segment.start, adder->segment.stop);
1245 GST_INFO_OBJECT (adder, "timestamp %" G_GINT64_FORMAT ",new offset %"
1246 G_GINT64_FORMAT, adder->segment.position, adder->offset);
1249 if (!gst_pad_push_event (adder->srcpad, event)) {
1250 GST_WARNING_OBJECT (adder->srcpad, "Sending new segment event failed");
1253 GST_WARNING_OBJECT (adder->srcpad, "Creating new segment event for "
1254 "start:%" G_GINT64_FORMAT " end:%" G_GINT64_FORMAT " failed",
1255 adder->segment.start, adder->segment.stop);
1259 if (G_UNLIKELY (adder->pending_events)) {
1260 GList *tmp = adder->pending_events;
1263 GstEvent *ev = (GstEvent *) tmp->data;
1265 gst_pad_push_event (adder->srcpad, ev);
1266 tmp = g_list_next (tmp);
1268 g_list_free (adder->pending_events);
1269 adder->pending_events = NULL;
1272 /* for the next timestamp, use the sample counter, which will
1273 * never accumulate rounding errors */
1274 if (adder->segment.rate > 0.0) {
1275 next_offset = adder->offset + outsize / bpf;
1277 next_offset = adder->offset - outsize / bpf;
1279 next_timestamp = gst_util_uint64_scale (next_offset, GST_SECOND, rate);
1282 /* set timestamps on the output buffer */
1283 if (adder->segment.rate > 0.0) {
1284 GST_BUFFER_TIMESTAMP (outbuf) = adder->segment.position;
1285 GST_BUFFER_OFFSET (outbuf) = adder->offset;
1286 GST_BUFFER_OFFSET_END (outbuf) = next_offset;
1287 GST_BUFFER_DURATION (outbuf) = next_timestamp - adder->segment.position;
1289 GST_BUFFER_TIMESTAMP (outbuf) = next_timestamp;
1290 GST_BUFFER_OFFSET (outbuf) = next_offset;
1291 GST_BUFFER_OFFSET_END (outbuf) = adder->offset;
1292 GST_BUFFER_DURATION (outbuf) = adder->segment.position - next_timestamp;
1295 adder->offset = next_offset;
1296 adder->segment.position = next_timestamp;
1299 GST_LOG_OBJECT (adder, "pushing outbuf %p, timestamp %" GST_TIME_FORMAT
1300 " offset %" G_GINT64_FORMAT, outbuf,
1301 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
1302 GST_BUFFER_OFFSET (outbuf));
1303 ret = gst_pad_push (adder->srcpad, outbuf);
1305 GST_LOG_OBJECT (adder, "pushed outbuf, result = %s", gst_flow_get_name (ret));
1312 GST_ELEMENT_ERROR (adder, STREAM, FORMAT, (NULL),
1313 ("Unknown data received, not negotiated"));
1314 return GST_FLOW_NOT_NEGOTIATED;
1318 GST_DEBUG_OBJECT (adder, "no data available, must be EOS");
1319 gst_pad_push_event (adder->srcpad, gst_event_new_eos ());
1320 return GST_FLOW_EOS;
1324 static GstStateChangeReturn
1325 gst_adder_change_state (GstElement * element, GstStateChange transition)
1328 GstStateChangeReturn ret;
1330 adder = GST_ADDER (element);
1332 switch (transition) {
1333 case GST_STATE_CHANGE_NULL_TO_READY:
1335 case GST_STATE_CHANGE_READY_TO_PAUSED:
1336 adder->segment.position = 0;
1338 adder->flush_stop_pending = FALSE;
1339 adder->new_segment_pending = TRUE;
1340 adder->wait_for_new_segment = FALSE;
1341 gst_caps_replace (&adder->current_caps, NULL);
1342 gst_segment_init (&adder->segment, GST_FORMAT_TIME);
1343 gst_collect_pads_start (adder->collect);
1345 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
1347 case GST_STATE_CHANGE_PAUSED_TO_READY:
1348 /* need to unblock the collectpads before calling the
1349 * parent change_state so that streaming can finish */
1350 gst_collect_pads_stop (adder->collect);
1356 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1358 switch (transition) {
1367 plugin_init (GstPlugin * plugin)
1369 GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "adder", 0,
1370 "audio channel mixing element");
1372 if (!gst_element_register (plugin, "adder", GST_RANK_NONE, GST_TYPE_ADDER)) {
1379 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
1382 "Adds multiple streams",
1383 plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)