gstreamer/plugins/elements/gstoutputselector.c

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/* GStreamer output selector
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* 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-output-selector
* @see_also: #GstOutputSelector, #GstInputSelector
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*
* Direct input stream to one out of N output pads.
*
* Since: 0.10.32
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*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstoutputselector.h"
GST_DEBUG_CATEGORY_STATIC (output_selector_debug);
#define GST_CAT_DEFAULT output_selector_debug
static GstStaticPadTemplate gst_output_selector_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_output_selector_src_factory =
GST_STATIC_PAD_TEMPLATE ("src%d",
GST_PAD_SRC,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
enum
{
PROP_0,
PROP_ACTIVE_PAD,
PROP_RESEND_LATEST
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};
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (output_selector_debug, \
"output-selector", 0, "Output stream selector");
GST_BOILERPLATE_FULL (GstOutputSelector, gst_output_selector, GstElement,
GST_TYPE_ELEMENT, _do_init);
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static void gst_output_selector_dispose (GObject * object);
static void gst_output_selector_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_output_selector_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstPad *gst_output_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused);
static void gst_output_selector_release_pad (GstElement * element,
GstPad * pad);
static GstFlowReturn gst_output_selector_chain (GstPad * pad, GstBuffer * buf);
static GstFlowReturn gst_output_selector_buffer_alloc (GstPad * pad,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
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static GstStateChangeReturn gst_output_selector_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_output_selector_handle_sink_event (GstPad * pad,
GstEvent * event);
static void
gst_output_selector_base_init (gpointer g_class)
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{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class, "Output selector",
"Generic", "1-to-N output stream selector",
"Stefan Kost <stefan.kost@nokia.com>");
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gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_output_selector_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_output_selector_src_factory));
}
static void
gst_output_selector_class_init (GstOutputSelectorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->dispose = gst_output_selector_dispose;
gobject_class->set_property = gst_output_selector_set_property;
gobject_class->get_property = gst_output_selector_get_property;
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g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
g_param_spec_object ("active-pad", "Active pad",
"Currently active src pad", GST_TYPE_PAD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_RESEND_LATEST,
g_param_spec_boolean ("resend-latest", "Resend latest buffer",
"Resend latest buffer after a switch to a new pad", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_output_selector_request_new_pad);
gstelement_class->release_pad =
GST_DEBUG_FUNCPTR (gst_output_selector_release_pad);
gstelement_class->change_state = gst_output_selector_change_state;
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}
static void
gst_output_selector_init (GstOutputSelector * sel,
GstOutputSelectorClass * g_class)
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{
sel->sinkpad =
gst_pad_new_from_static_template (&gst_output_selector_sink_factory,
"sink");
gst_pad_set_chain_function (sel->sinkpad,
GST_DEBUG_FUNCPTR (gst_output_selector_chain));
gst_pad_set_event_function (sel->sinkpad,
GST_DEBUG_FUNCPTR (gst_output_selector_handle_sink_event));
gst_pad_set_bufferalloc_function (sel->sinkpad,
GST_DEBUG_FUNCPTR (gst_output_selector_buffer_alloc));
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/*
gst_pad_set_setcaps_function (sel->sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_setcaps));
gst_pad_set_getcaps_function (sel->sinkpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
*/
gst_element_add_pad (GST_ELEMENT (sel), sel->sinkpad);
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/* srcpad management */
sel->active_srcpad = NULL;
sel->nb_srcpads = 0;
gst_segment_init (&sel->segment, GST_FORMAT_TIME);
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sel->pending_srcpad = NULL;
sel->resend_latest = FALSE;
sel->latest_buffer = NULL;
}
static void
gst_output_selector_reset (GstOutputSelector * osel)
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{
if (osel->pending_srcpad != NULL) {
gst_object_unref (osel->pending_srcpad);
osel->pending_srcpad = NULL;
}
if (osel->latest_buffer != NULL) {
gst_buffer_unref (osel->latest_buffer);
osel->latest_buffer = NULL;
}
gst_segment_init (&osel->segment, GST_FORMAT_UNDEFINED);
}
static void
gst_output_selector_dispose (GObject * object)
{
GstOutputSelector *osel = GST_OUTPUT_SELECTOR (object);
gst_output_selector_reset (osel);
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G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_output_selector_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object);
switch (prop_id) {
case PROP_ACTIVE_PAD:
{
GstPad *next_pad;
next_pad = g_value_get_object (value);
GST_INFO_OBJECT (sel, "Activating pad %s:%s",
GST_DEBUG_PAD_NAME (next_pad));
GST_OBJECT_LOCK (object);
if (next_pad != sel->active_srcpad) {
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/* switch to new srcpad in next chain run */
if (sel->pending_srcpad != NULL) {
GST_INFO ("replacing pending switch");
gst_object_unref (sel->pending_srcpad);
}
if (next_pad)
gst_object_ref (next_pad);
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sel->pending_srcpad = next_pad;
} else {
GST_INFO ("pad already active");
if (sel->pending_srcpad != NULL) {
gst_object_unref (sel->pending_srcpad);
sel->pending_srcpad = NULL;
}
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}
GST_OBJECT_UNLOCK (object);
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break;
}
case PROP_RESEND_LATEST:{
sel->resend_latest = g_value_get_boolean (value);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_output_selector_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstOutputSelector *sel = GST_OUTPUT_SELECTOR (object);
switch (prop_id) {
case PROP_ACTIVE_PAD:
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GST_OBJECT_LOCK (object);
g_value_set_object (value,
sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad);
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GST_OBJECT_UNLOCK (object);
break;
case PROP_RESEND_LATEST:{
GST_OBJECT_LOCK (object);
g_value_set_boolean (value, sel->resend_latest);
GST_OBJECT_UNLOCK (object);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_output_selector_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstOutputSelector *sel;
GstFlowReturn res;
GstPad *allocpad;
sel = GST_OUTPUT_SELECTOR (GST_PAD_PARENT (pad));
res = GST_FLOW_NOT_LINKED;
GST_OBJECT_LOCK (sel);
allocpad = sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad;
if (allocpad) {
/* if we had a previous pad we used for allocating a buffer, continue using
* it. */
GST_DEBUG_OBJECT (sel, "using pad %s:%s for alloc",
GST_DEBUG_PAD_NAME (allocpad));
gst_object_ref (allocpad);
GST_OBJECT_UNLOCK (sel);
res = gst_pad_alloc_buffer (allocpad, offset, size, caps, buf);
gst_object_unref (allocpad);
GST_OBJECT_LOCK (sel);
} else {
/* fallback case, allocate a buffer of our own, add pad caps. */
GST_DEBUG_OBJECT (pad, "fallback buffer alloc");
*buf = NULL;
res = GST_FLOW_OK;
}
GST_OBJECT_UNLOCK (sel);
GST_DEBUG_OBJECT (sel, "buffer alloc finished: %s", gst_flow_get_name (res));
return res;
}
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static GstPad *
gst_output_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * name)
{
gchar *padname;
GstPad *srcpad;
GstOutputSelector *osel;
osel = GST_OUTPUT_SELECTOR (element);
GST_DEBUG_OBJECT (osel, "requesting pad");
GST_OBJECT_LOCK (osel);
padname = g_strdup_printf ("src%d", osel->nb_srcpads++);
srcpad = gst_pad_new_from_template (templ, padname);
GST_OBJECT_UNLOCK (osel);
gst_pad_set_active (srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT (osel), srcpad);
/* Set the first requested src pad as active by default */
if (osel->active_srcpad == NULL) {
osel->active_srcpad = srcpad;
}
g_free (padname);
return srcpad;
}
static void
gst_output_selector_release_pad (GstElement * element, GstPad * pad)
{
GstOutputSelector *osel;
osel = GST_OUTPUT_SELECTOR (element);
GST_DEBUG_OBJECT (osel, "releasing pad");
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (osel), pad);
}
static gboolean
gst_output_selector_switch (GstOutputSelector * osel)
{
gboolean res = FALSE;
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GstEvent *ev = NULL;
GstSegment *seg = NULL;
gint64 start = 0, position = 0;
/* Switch */
GST_OBJECT_LOCK (GST_OBJECT (osel));
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GST_INFO ("switching to pad %" GST_PTR_FORMAT, osel->pending_srcpad);
if (gst_pad_is_linked (osel->pending_srcpad)) {
osel->active_srcpad = osel->pending_srcpad;
res = TRUE;
}
gst_object_unref (osel->pending_srcpad);
osel->pending_srcpad = NULL;
GST_OBJECT_UNLOCK (GST_OBJECT (osel));
/* Send NEWSEGMENT event and latest buffer if switching succeeded */
if (res) {
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/* Send NEWSEGMENT to the pad we are going to switch to */
seg = &osel->segment;
/* If resending then mark newsegment start and position accordingly */
if (osel->resend_latest && osel->latest_buffer &&
GST_BUFFER_TIMESTAMP_IS_VALID (osel->latest_buffer)) {
start = position = GST_BUFFER_TIMESTAMP (osel->latest_buffer);
} else {
start = position = seg->last_stop;
}
ev = gst_event_new_new_segment (TRUE, seg->rate,
seg->format, start, seg->stop, position);
if (!gst_pad_push_event (osel->active_srcpad, ev)) {
GST_WARNING_OBJECT (osel,
"newsegment handling failed in %" GST_PTR_FORMAT,
osel->active_srcpad);
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}
/* Resend latest buffer to newly switched pad */
if (osel->resend_latest && osel->latest_buffer) {
GST_INFO ("resending latest buffer");
gst_pad_push (osel->active_srcpad, gst_buffer_ref (osel->latest_buffer));
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}
} else {
GST_WARNING_OBJECT (osel, "switch failed, pad not linked");
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}
return res;
}
static GstFlowReturn
gst_output_selector_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn res;
GstOutputSelector *osel;
GstClockTime last_stop, duration;
osel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
/*
* The _switch function might push a buffer if 'resend-latest' is true.
*
* Elements/Applications (e.g. camerabin) might use pad probes to
* switch output-selector's active pad. If we simply switch and don't
* recheck any pending pad switch the following codepath could end
* up pushing a buffer on a non-active pad. This is bad.
*
* So we always should check the pending_srcpad before going further down
* the chain and pushing the new buffer
*/
while (osel->pending_srcpad) {
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/* Do the switch */
gst_output_selector_switch (osel);
}
if (osel->latest_buffer) {
gst_buffer_unref (osel->latest_buffer);
osel->latest_buffer = NULL;
}
if (osel->resend_latest) {
/* Keep reference to latest buffer to resend it after switch */
osel->latest_buffer = gst_buffer_ref (buf);
}
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/* Keep track of last stop and use it in NEWSEGMENT start after
switching to a new src pad */
last_stop = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
duration = GST_BUFFER_DURATION (buf);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
last_stop += duration;
}
GST_LOG_OBJECT (osel, "setting last stop %" GST_TIME_FORMAT,
GST_TIME_ARGS (last_stop));
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gst_segment_set_last_stop (&osel->segment, osel->segment.format, last_stop);
}
GST_LOG_OBJECT (osel, "pushing buffer to %" GST_PTR_FORMAT,
osel->active_srcpad);
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res = gst_pad_push (osel->active_srcpad, buf);
gst_object_unref (osel);
return res;
}
static GstStateChangeReturn
gst_output_selector_change_state (GstElement * element,
GstStateChange transition)
{
GstOutputSelector *sel;
GstStateChangeReturn result;
sel = GST_OUTPUT_SELECTOR (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_output_selector_reset (sel);
break;
default:
break;
}
return result;
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}
static gboolean
gst_output_selector_handle_sink_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstOutputSelector *sel;
GstPad *output_pad = NULL;
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sel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
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 %"
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G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
gst_segment_set_newsegment_full (&sel->segment, update,
rate, arate, format, start, stop, time);
/* Send newsegment to all src pads */
gst_pad_event_default (pad, event);
break;
}
case GST_EVENT_EOS:
/* Send eos to all src pads */
gst_pad_event_default (pad, event);
break;
default:
/* Send other events to pending or active src pad */
output_pad =
sel->pending_srcpad ? sel->pending_srcpad : sel->active_srcpad;
res = gst_pad_push_event (output_pad, event);
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break;
}
gst_object_unref (sel);
return res;
}