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Diffstat (limited to 'gst/selector/gstinputselector.c')
| -rw-r--r-- | gst/selector/gstinputselector.c | 981 |
1 files changed, 981 insertions, 0 deletions
diff --git a/gst/selector/gstinputselector.c b/gst/selector/gstinputselector.c new file mode 100644 index 00000000..a4d46182 --- /dev/null +++ b/gst/selector/gstinputselector.c @@ -0,0 +1,981 @@ +/* GStreamer + * Copyright (C) 2003 Julien Moutte <julien@moutte.net> + * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net> + * Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com> + * Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com> + * Copyright (C) 2007 Andy Wingo <wingo@pobox.com> + * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>) + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +/** + * SECTION:element-input-selector + * @short_description: N-to-1 stream selectoring + * @see_also: #GstOutputSelector + * + * Direct one out of N input streams to the output pad. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <string.h> + +#include "gstinputselector.h" +#include "gstselector-marshal.h" + +GST_DEBUG_CATEGORY_STATIC (input_selector_debug); +#define GST_CAT_DEFAULT input_selector_debug + +static const GstElementDetails gst_input_selector_details = +GST_ELEMENT_DETAILS ("Input selector", + "Generic", + "N-to-1 input stream selectoring", + "Julien Moutte <julien@moutte.net>\n" + "Ronald S. Bultje <rbultje@ronald.bitfreak.net>\n" + "Jan Schmidt <thaytan@mad.scientist.com>\n" + "Wim Taymans <wim.taymans@gmail.com>"); + +static GstStaticPadTemplate gst_input_selector_sink_factory = +GST_STATIC_PAD_TEMPLATE ("sink%d", + GST_PAD_SINK, + GST_PAD_REQUEST, + GST_STATIC_CAPS_ANY); + +static GstStaticPadTemplate gst_input_selector_src_factory = +GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS_ANY); + +enum +{ + PROP_ACTIVE_PAD = 1 +}; + +enum +{ + PAD_PROP_RUNNING_TIME = 1 +}; + +enum +{ + /* methods */ + SIGNAL_BLOCK, + SIGNAL_SWITCH, + LAST_SIGNAL +}; +static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 }; + +static gboolean gst_input_selector_is_active_sinkpad (GstInputSelector * sel, + GstPad * pad); +static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel, + GstPad * pad); +static GstPad *gst_input_selector_get_linked_pad (GstPad * pad, + gboolean strict); +static void gst_input_selector_push_pending_stop (GstInputSelector * self); + +#define GST_TYPE_SELECTOR_PAD \ + (gst_selector_pad_get_type()) +#define GST_SELECTOR_PAD(obj) \ + (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad)) +#define GST_SELECTOR_PAD_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass)) +#define GST_IS_SELECTOR_PAD(obj) \ + (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD)) +#define GST_IS_SELECTOR_PAD_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD)) +#define GST_SELECTOR_PAD_CAST(obj) \ + ((GstSelectorPad *)(obj)) + +typedef struct _GstSelectorPad GstSelectorPad; +typedef struct _GstSelectorPadClass GstSelectorPadClass; + +struct _GstSelectorPad +{ + GstPad parent; + + gboolean active; + gboolean eos; + gboolean segment_pending; + GstSegment segment; +}; + +struct _GstSelectorPadClass +{ + GstPadClass parent; +}; + +static void gst_selector_pad_class_init (GstSelectorPadClass * klass); +static void gst_selector_pad_init (GstSelectorPad * pad); +static void gst_selector_pad_finalize (GObject * object); +static void gst_selector_pad_get_property (GObject * object, + guint prop_id, GValue * value, GParamSpec * pspec); + +static GstPadClass *selector_pad_parent_class = NULL; + +static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad); +static void gst_selector_pad_reset (GstSelectorPad * pad); +static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event); +static GstCaps *gst_selector_pad_getcaps (GstPad * pad); +static GList *gst_selector_pad_get_linked_pads (GstPad * pad); +static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf); +static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad, + guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf); + +static GType +gst_selector_pad_get_type (void) +{ + static GType selector_pad_type = 0; + + if (!selector_pad_type) { + static const GTypeInfo selector_pad_info = { + sizeof (GstSelectorPadClass), + NULL, + NULL, + (GClassInitFunc) gst_selector_pad_class_init, + NULL, + NULL, + sizeof (GstSelectorPad), + 0, + (GInstanceInitFunc) gst_selector_pad_init, + }; + + selector_pad_type = + g_type_register_static (GST_TYPE_PAD, "GstSelectorPad", + &selector_pad_info, 0); + } + return selector_pad_type; +} + +static void +gst_selector_pad_class_init (GstSelectorPadClass * klass) +{ + GObjectClass *gobject_class; + + gobject_class = (GObjectClass *) klass; + + selector_pad_parent_class = g_type_class_peek_parent (klass); + + gobject_class->get_property = + GST_DEBUG_FUNCPTR (gst_selector_pad_get_property); + g_object_class_install_property (gobject_class, PAD_PROP_RUNNING_TIME, + g_param_spec_int64 ("running-time", "Running time", + "Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE)); + + gobject_class->finalize = gst_selector_pad_finalize; +} + +static void +gst_selector_pad_init (GstSelectorPad * pad) +{ + gst_selector_pad_reset (pad); +} + +static void +gst_selector_pad_finalize (GObject * object) +{ + GstSelectorPad *pad; + + pad = GST_SELECTOR_PAD_CAST (object); + + G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object); +} + +static void +gst_selector_pad_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object); + + switch (prop_id) { + case PAD_PROP_RUNNING_TIME: + g_value_set_int64 (value, gst_selector_pad_get_running_time (spad)); + break; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static gint64 +gst_selector_pad_get_running_time (GstSelectorPad * pad) +{ + gint64 ret = 0; + + GST_OBJECT_LOCK (pad); + + if (pad->active) { + gint64 last_stop = pad->segment.last_stop; + + if (last_stop >= 0) + ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME, + last_stop); + } + + GST_OBJECT_UNLOCK (pad); + + GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT, + GST_TIME_ARGS (ret)); + + return ret; +} + +static void +gst_selector_pad_reset (GstSelectorPad * pad) +{ + pad->active = FALSE; + pad->eos = FALSE; + gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED); +} + +/* strictly get the linked pad from the sinkpad. If the pad is active we return + * the srcpad else we return NULL */ +static GList * +gst_selector_pad_get_linked_pads (GstPad * pad) +{ + GstPad *otherpad; + + otherpad = gst_input_selector_get_linked_pad (pad, TRUE); + if (!otherpad) + return NULL; + + /* need to drop the ref, internal linked pads is not MT safe */ + gst_object_unref (otherpad); + + return g_list_append (NULL, otherpad); +} + +static gboolean +gst_selector_pad_event (GstPad * pad, GstEvent * event) +{ + gboolean res = TRUE; + gboolean forward = TRUE; + GstInputSelector *sel; + GstSelectorPad *selpad; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + selpad = GST_SELECTOR_PAD_CAST (pad); + + /* only forward if we are dealing with the active sinkpad */ + forward = gst_input_selector_is_active_sinkpad (sel, pad); + + switch (GST_EVENT_TYPE (event)) { + case GST_EVENT_FLUSH_STOP: + gst_selector_pad_reset (selpad); + break; + case GST_EVENT_NEWSEGMENT: + { + gboolean update; + GstFormat format; + gdouble rate, arate; + gint64 start, stop, time; + + gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format, + &start, &stop, &time); + + GST_DEBUG_OBJECT (sel, + "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, " + "format %d, " + "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %" + G_GINT64_FORMAT, update, rate, arate, format, start, stop, time); + + gst_segment_set_newsegment_full (&selpad->segment, update, + rate, arate, format, start, stop, time); + /* if we are not going to forward the segment, mark the segment as + * pending */ + if (!forward) + selpad->segment_pending = TRUE; + break; + } + case GST_EVENT_EOS: + selpad->eos = TRUE; + break; + default: + break; + } + if (forward) + res = gst_pad_push_event (sel->srcpad, event); + + gst_object_unref (sel); + + return res; +} + +static GstCaps * +gst_selector_pad_getcaps (GstPad * pad) +{ + GstInputSelector *sel; + GstCaps *caps; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + + GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer"); + caps = gst_pad_peer_get_caps (sel->srcpad); + if (caps == NULL) + caps = gst_caps_new_any (); + + gst_object_unref (sel); + + return caps; +} + +static GstFlowReturn +gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset, + guint size, GstCaps * caps, GstBuffer ** buf) +{ + GstInputSelector *sel; + GstFlowReturn result; + GstPad *active_sinkpad; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + + active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); + + /* Fallback allocation for buffers from pads except the selected one */ + if (pad != active_sinkpad) { + GST_DEBUG_OBJECT (sel, + "Pad %s:%s is not selected. Performing fallback allocation", + GST_DEBUG_PAD_NAME (pad)); + + *buf = NULL; + result = GST_FLOW_OK; + } else { + result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf); + + /* FIXME: HACK. If buffer alloc returns not-linked, perform a fallback + * allocation. This should NOT be necessary, because playbin should + * properly block the source pad from running until it's finished hooking + * everything up, but playbin needs refactoring first. */ + if (result == GST_FLOW_NOT_LINKED) { + GST_DEBUG_OBJECT (sel, + "No peer pad yet - performing fallback allocation for pad %s:%s", + GST_DEBUG_PAD_NAME (pad)); + + *buf = NULL; + result = GST_FLOW_OK; + } + } + + gst_object_unref (sel); + + return result; +} + +static gboolean +gst_input_selector_wait (GstInputSelector * self, GstPad * pad) +{ + gboolean flushing; + + GST_OBJECT_LOCK (self); + + while (self->blocked) + g_cond_wait (self->blocked_cond, GST_OBJECT_GET_LOCK (self)); + + GST_OBJECT_UNLOCK (self); + + GST_OBJECT_LOCK (pad); + flushing = GST_PAD_IS_FLUSHING (pad); + GST_OBJECT_UNLOCK (pad); + + return flushing; +} + +static GstFlowReturn +gst_selector_pad_chain (GstPad * pad, GstBuffer * buf) +{ + GstInputSelector *sel; + GstFlowReturn res; + GstPad *active_sinkpad; + GstSelectorPad *selpad; + GstClockTime end_time, duration; + GstSegment *seg; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + selpad = GST_SELECTOR_PAD_CAST (pad); + seg = &selpad->segment; + + if (gst_input_selector_wait (sel, pad)) + goto ignore; + + active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); + + end_time = GST_BUFFER_TIMESTAMP (buf); + if (GST_CLOCK_TIME_IS_VALID (end_time)) { + duration = GST_BUFFER_DURATION (buf); + if (GST_CLOCK_TIME_IS_VALID (duration)) + end_time += duration; + GST_DEBUG_OBJECT (sel, "received end time %" GST_TIME_FORMAT, + GST_TIME_ARGS (end_time)); + gst_segment_set_last_stop (seg, seg->format, end_time); + } + + /* Ignore buffers from pads except the selected one */ + if (pad != active_sinkpad) + goto ignore; + + gst_input_selector_push_pending_stop (sel); + + /* if we have a pending segment, push it out now */ + if (selpad->segment_pending) { + gst_pad_push_event (sel->srcpad, gst_event_new_new_segment_full (FALSE, + seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop, + seg->time)); + + selpad->segment_pending = FALSE; + } + + /* forward */ + GST_DEBUG_OBJECT (sel, "Forwarding buffer %p from pad %s:%s", buf, + GST_DEBUG_PAD_NAME (pad)); + res = gst_pad_push (sel->srcpad, buf); +done: + gst_object_unref (sel); + return res; + /* dropped buffers */ +ignore: + { + GST_DEBUG_OBJECT (sel, "Ignoring buffer %p from pad %s:%s", + buf, GST_DEBUG_PAD_NAME (pad)); + gst_buffer_unref (buf); + res = GST_FLOW_OK; + goto done; + } +} + +static void gst_input_selector_dispose (GObject * object); +static void gst_input_selector_init (GstInputSelector * sel); +static void gst_input_selector_base_init (GstInputSelectorClass * klass); +static void gst_input_selector_class_init (GstInputSelectorClass * klass); +static void gst_input_selector_set_property (GObject * object, + guint prop_id, const GValue * value, GParamSpec * pspec); +static void gst_input_selector_get_property (GObject * object, + guint prop_id, GValue * value, GParamSpec * pspec); +static GstPad *gst_input_selector_request_new_pad (GstElement * element, + GstPadTemplate * templ, const gchar * unused); +static void gst_input_selector_release_pad (GstElement * element, GstPad * pad); +static GstStateChangeReturn gst_input_selector_change_state (GstElement * + element, GstStateChange transition); +static GList *gst_input_selector_get_linked_pads (GstPad * pad); +static GstCaps *gst_input_selector_getcaps (GstPad * pad); +static gint64 gst_input_selector_block (GstInputSelector * self); +static void gst_input_selector_switch (GstInputSelector * self, + const gchar * pad_name, gint64 stop_time, gint64 start_time); + +static GstElementClass *parent_class = NULL; + +GType +gst_input_selector_get_type (void) +{ + static GType input_selector_type = 0; + + if (!input_selector_type) { + static const GTypeInfo input_selector_info = { + sizeof (GstInputSelectorClass), + (GBaseInitFunc) gst_input_selector_base_init, + NULL, + (GClassInitFunc) gst_input_selector_class_init, + NULL, + NULL, + sizeof (GstInputSelector), + 0, + (GInstanceInitFunc) gst_input_selector_init, + }; + input_selector_type = + g_type_register_static (GST_TYPE_ELEMENT, + "GstInputSelector", &input_selector_info, 0); + GST_DEBUG_CATEGORY_INIT (input_selector_debug, + "input-selector", 0, "An input stream selector element"); + } + + return input_selector_type; +} + +static void +gst_input_selector_base_init (GstInputSelectorClass * klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS (klass); + + gst_element_class_set_details (element_class, &gst_input_selector_details); + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&gst_input_selector_sink_factory)); + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&gst_input_selector_src_factory)); +} + +static void +gst_input_selector_class_init (GstInputSelectorClass * klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); + + parent_class = g_type_class_peek_parent (klass); + gobject_class->set_property = + GST_DEBUG_FUNCPTR (gst_input_selector_set_property); + gobject_class->get_property = + GST_DEBUG_FUNCPTR (gst_input_selector_get_property); + g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD, + g_param_spec_string ("active-pad", "Active pad", + "Name of the currently" " active sink pad", NULL, G_PARAM_READWRITE)); + gobject_class->dispose = gst_input_selector_dispose; + gstelement_class->request_new_pad = gst_input_selector_request_new_pad; + gstelement_class->release_pad = gst_input_selector_release_pad; + gstelement_class->change_state = gst_input_selector_change_state; + + /** + * GstInputSelector::block: + * @inputselector: the #GstInputSelector + * + * Block all sink pads in preparation for a switch. Returns the stop time of + * the current switch segment, as a running time, or 0 if there is no current + * active pad or the current active pad never received data. + */ + gst_input_selector_signals[SIGNAL_BLOCK] = + g_signal_new ("block", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (GstInputSelectorClass, block), + NULL, NULL, gst_selector_marshal_INT64__VOID, G_TYPE_INT64, 0); + /** + * GstInputSelector::switch: + * @inputselector: the #GstInputSelector + * @pad: name of pad to switch to + * @stop_time: running time at which to close the previous segment, or -1 + * to use the running time of the previously active sink pad + * @start_time: running time at which to start the new segment, or -1 to + * use the running time of the newly active sink pad + * + * Switch to a new feed. The segment opened by the previously active pad, if + * any, will be closed, and a new segment opened before data flows again. + * + * This signal must be emitted when the element has been blocked via the <link + * linkend="GstInputSelector-block">block</link> signal. + * + * If you have a stream with only one switch element, such as an audio-only + * stream, a stream switch should be performed by first emitting the block + * signal, and then emitting the switch signal with -1 for the stop and start + * time values. + * + * The intention of the @stop_time and @start_time arguments is to allow + * multiple switch elements to switch and maintain stream synchronization. + * When switching a stream with multiple feeds, you will need as many switch + * elements as you have feeds. For example, a feed with audio and video will + * have one switch element between the audio feeds and one for video. + * + * A switch over multiple switch elements should be performed as follows: + * First, emit the <link linkend="GstInputSelector-block">block</link> + * signal, collecting the returned values. The maximum running time returned + * by block should then be used as the time at which to close the previous + * segment. + * + * Then, query the running times of the new audio and video pads that you will + * switch to. Naturally, these pads are on separate switch elements. Take the + * minimum running time for those streams and use it for the time at which to + * open the new segment. + * + * If @pad is the same as the current active pad, the element will cancel any + * previous block without adjusting segments. + */ + gst_input_selector_signals[SIGNAL_SWITCH] = + g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (GstInputSelectorClass, switch_), + NULL, NULL, gst_selector_marshal_VOID__STRING_INT64_INT64, + G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_INT64, G_TYPE_INT64); + + klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block); + klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch); +} + +static void +gst_input_selector_init (GstInputSelector * sel) +{ + sel->srcpad = gst_pad_new ("src", GST_PAD_SRC); + gst_pad_set_internal_link_function (sel->srcpad, + GST_DEBUG_FUNCPTR (gst_input_selector_get_linked_pads)); + gst_pad_set_getcaps_function (sel->srcpad, + GST_DEBUG_FUNCPTR (gst_input_selector_getcaps)); + gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad); + /* sinkpad management */ + sel->active_sinkpad = NULL; + sel->nb_sinkpads = 0; + gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED); + + sel->blocked_cond = g_cond_new (); + sel->blocked = FALSE; +} + +static void +gst_input_selector_dispose (GObject * object) +{ + GstInputSelector *sel = GST_INPUT_SELECTOR (object); + + if (sel->active_sinkpad) { + gst_object_unref (sel->active_sinkpad); + sel->active_sinkpad = NULL; + } + + if (sel->blocked_cond) { + g_cond_free (sel->blocked_cond); + sel->blocked_cond = NULL; + } + + G_OBJECT_CLASS (parent_class)->dispose (object); +} + +/* Solve the following equation for B.timestamp, and set that as the segment + * stop: + * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum + */ +static gint64 +gst_segment_get_timestamp (GstSegment * segment, gint64 running_time) +{ + return (running_time - segment->accum) * segment->abs_rate + segment->start; +} + +static void +gst_segment_set_stop (GstSegment * segment, gint64 running_time) +{ + segment->stop = gst_segment_get_timestamp (segment, running_time); + segment->last_stop = -1; +} + +static void +gst_segment_set_start (GstSegment * segment, gint64 running_time) +{ + segment->start = gst_segment_get_timestamp (segment, running_time); +} + +static void +gst_input_selector_set_active_pad (GstInputSelector * self, + const gchar * pad_name, gint64 stop_time, gint64 start_time) +{ + GstPad *pad; + GstSelectorPad *old, *new; + GstPad **active_pad_p; + + if (strcmp (pad_name, "") != 0) + pad = gst_element_get_pad (GST_ELEMENT (self), pad_name); + else + pad = NULL; + + GST_OBJECT_LOCK (self); + + if (pad == self->active_sinkpad) + goto done; + + old = GST_SELECTOR_PAD_CAST (self->active_sinkpad); + new = GST_SELECTOR_PAD_CAST (pad); + + if (old && old->active && !self->pending_stop && stop_time >= 0) { + /* schedule a last_stop update if one isn't already scheduled, and a + segment has been pushed before. */ + memcpy (&self->pending_stop_segment, &old->segment, + sizeof (self->pending_stop_segment)); + gst_segment_set_stop (&self->pending_stop_segment, stop_time); + self->pending_stop = TRUE; + } + + if (new && new->active && start_time >= 0) { + /* schedule a new segment push */ + gst_segment_set_start (&new->segment, start_time); + new->segment_pending = TRUE; + } + + active_pad_p = &self->active_sinkpad; + gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad)); + GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT, + self->active_sinkpad); + +done: + GST_OBJECT_UNLOCK (self); + + if (pad) + gst_object_unref (pad); +} + + +static void +gst_input_selector_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstInputSelector *sel = GST_INPUT_SELECTOR (object); + + switch (prop_id) { + case PROP_ACTIVE_PAD: + gst_input_selector_set_active_pad (sel, + g_value_get_string (value), GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_input_selector_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstInputSelector *sel = GST_INPUT_SELECTOR (object); + + switch (prop_id) { + case PROP_ACTIVE_PAD:{ + GST_OBJECT_LOCK (object); + if (sel->active_sinkpad != NULL) { + g_value_take_string (value, gst_pad_get_name (sel->active_sinkpad)); + } else { + g_value_set_string (value, ""); + } + GST_OBJECT_UNLOCK (object); + break; + } + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static GstPad * +gst_input_selector_get_linked_pad (GstPad * pad, gboolean strict) +{ + GstInputSelector *sel; + GstPad *otherpad = NULL; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + GST_OBJECT_LOCK (sel); + if (pad == sel->srcpad) + otherpad = sel->active_sinkpad; + else if (pad == sel->active_sinkpad || !strict) + otherpad = sel->srcpad; + if (otherpad) + gst_object_ref (otherpad); + GST_OBJECT_UNLOCK (sel); + gst_object_unref (sel); + return otherpad; +} + +static GstCaps * +gst_input_selector_getcaps (GstPad * pad) +{ + GstPad *otherpad; + GstObject *parent; + GstCaps *caps; + + otherpad = gst_input_selector_get_linked_pad (pad, FALSE); + parent = gst_object_get_parent (GST_OBJECT (pad)); + if (!otherpad) { + GST_DEBUG_OBJECT (parent, + "Pad %s:%s not linked, returning ANY", GST_DEBUG_PAD_NAME (pad)); + caps = gst_caps_new_any (); + } else { + GST_DEBUG_OBJECT (parent, + "Pad %s:%s is linked (to %s:%s), returning peer caps", + GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (otherpad)); + /* if the peer has caps, use those. If the pad is not linked, this function + * returns NULL and we return ANY */ + if (!(caps = gst_pad_peer_get_caps (otherpad))) + caps = gst_caps_new_any (); + gst_object_unref (otherpad); + } + + gst_object_unref (parent); + return caps; +} + +/* check if the pad is the active sinkpad */ +static gboolean +gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad) +{ + GstSelectorPad *selpad; + gboolean res; + + selpad = GST_SELECTOR_PAD_CAST (pad); + + GST_OBJECT_LOCK (sel); + res = (pad == sel->active_sinkpad); + GST_OBJECT_UNLOCK (sel); + + return res; +} + +/* Get or create the active sinkpad */ +static GstPad * +gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad) +{ + GstPad *active_sinkpad; + GstSelectorPad *selpad; + + selpad = GST_SELECTOR_PAD_CAST (pad); + + GST_OBJECT_LOCK (sel); + selpad->active = TRUE; + active_sinkpad = sel->active_sinkpad; + if (active_sinkpad == NULL) { + /* first pad we get an alloc on becomes the activated pad by default */ + active_sinkpad = sel->active_sinkpad = gst_object_ref (pad); + GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad)); + } + GST_OBJECT_UNLOCK (sel); + + return active_sinkpad; +} + +static GList * +gst_input_selector_get_linked_pads (GstPad * pad) +{ + GstPad *otherpad; + + otherpad = gst_input_selector_get_linked_pad (pad, TRUE); + if (!otherpad) + return NULL; + /* need to drop the ref, internal linked pads is not MT safe */ + gst_object_unref (otherpad); + return g_list_append (NULL, otherpad); +} + +static GstPad * +gst_input_selector_request_new_pad (GstElement * element, + GstPadTemplate * templ, const gchar * unused) +{ + GstInputSelector *sel; + gchar *name = NULL; + GstPad *sinkpad = NULL; + + sel = GST_INPUT_SELECTOR (element); + g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL); + GST_LOG_OBJECT (sel, "Creating new pad %d", sel->nb_sinkpads); + GST_OBJECT_LOCK (sel); + name = g_strdup_printf ("sink%d", sel->nb_sinkpads++); + sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD, + "name", name, "direction", templ->direction, "template", templ, NULL); + g_free (name); + GST_OBJECT_UNLOCK (sel); + + gst_pad_set_event_function (sinkpad, + GST_DEBUG_FUNCPTR (gst_selector_pad_event)); + gst_pad_set_getcaps_function (sinkpad, + GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps)); + gst_pad_set_chain_function (sinkpad, + GST_DEBUG_FUNCPTR (gst_selector_pad_chain)); + gst_pad_set_internal_link_function (sinkpad, + GST_DEBUG_FUNCPTR (gst_selector_pad_get_linked_pads)); + gst_pad_set_bufferalloc_function (sinkpad, + GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc)); + + gst_pad_set_active (sinkpad, TRUE); + gst_element_add_pad (GST_ELEMENT (sel), sinkpad); + return sinkpad; +} + +static void +gst_input_selector_release_pad (GstElement * element, GstPad * pad) +{ + GstInputSelector *sel; + + sel = GST_INPUT_SELECTOR (element); + GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad)); + + GST_OBJECT_LOCK (sel); + /* if the pad was the active pad, makes us select a new one */ + if (sel->active_sinkpad == pad) { + GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad)); + sel->active_sinkpad = NULL; + } + GST_OBJECT_UNLOCK (sel); + + gst_pad_set_active (pad, FALSE); + gst_element_remove_pad (GST_ELEMENT (sel), pad); +} + +static GstStateChangeReturn +gst_input_selector_change_state (GstElement * element, + GstStateChange transition) +{ + GstInputSelector *self = GST_INPUT_SELECTOR (element); + GstStateChangeReturn result; + + result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); + + if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) { + GST_OBJECT_LOCK (self); + self->blocked = FALSE; + g_cond_broadcast (self->blocked_cond); + GST_OBJECT_UNLOCK (self); + } + + return result; +} + +static gint64 +gst_input_selector_block (GstInputSelector * self) +{ + gint64 ret = 0; + GstSelectorPad *spad; + + GST_OBJECT_LOCK (self); + + if (self->blocked) + GST_WARNING_OBJECT (self, "switch already blocked"); + + self->blocked = TRUE; + spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad); + + if (self->active_sinkpad) + ret = gst_selector_pad_get_running_time (spad); + else + GST_DEBUG_OBJECT (self, "no active pad while blocking"); + + GST_OBJECT_UNLOCK (self); + + return ret; +} + +static void +gst_input_selector_push_pending_stop (GstInputSelector * self) +{ + GstEvent *event = NULL; + + GST_OBJECT_LOCK (self); + + if (G_UNLIKELY (self->pending_stop)) { + GstSegment *seg = &self->pending_stop_segment; + + event = gst_event_new_new_segment_full (TRUE, seg->rate, + seg->applied_rate, seg->format, seg->start, seg->stop, seg->stop); + + self->pending_stop = FALSE; + } + + GST_OBJECT_UNLOCK (self); + + if (event) + gst_pad_push_event (self->srcpad, event); +} + +/* stop_time and start_time are running times */ +static void +gst_input_selector_switch (GstInputSelector * self, const gchar * pad_name, + gint64 stop_time, gint64 start_time) +{ + g_return_if_fail (self->blocked == TRUE); + + gst_input_selector_set_active_pad (self, pad_name, stop_time, start_time); + + GST_OBJECT_LOCK (self); + self->blocked = FALSE; + g_cond_broadcast (self->blocked_cond); + GST_OBJECT_UNLOCK (self); +} |