gstreamer/ext/smoothstreaming/gstmssdemux.c

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/* GStreamer
* Copyright (C) 2012 Smart TV Alliance
* Author: Thiago Sousa Santos <thiago.sousa.santos@collabora.com>, Collabora Ltd.
*
* gstmssdemux.c:
*
* 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-mssdemux
*
* Demuxes a Microsoft's Smooth Streaming manifest into its audio and/or video streams.
*
*
*/
/*
* == Internals
*
* = Smooth streaming in a few lines
* A SS stream is defined by a xml manifest file. This file has a list of
* tracks (StreamIndex), each one can have multiple QualityLevels, that define
* different encoding/bitrates. When playing a track, only one of those
* QualityLevels can be active at a time (per stream).
*
* The StreamIndex defines a URL with {time} and {bitrate} tags that are
* replaced by values indicated by the fragment start times and the selected
* QualityLevel, that generates the fragments URLs.
*
* Another relevant detail is that the Isomedia fragments for smoothstreaming
* won't contains a 'moov' atom, nor a 'stsd', so there is no information
* about the media type/configuration on the fragments, it must be extracted
* from the Manifest and passed downstream. mssdemux does this via GstCaps.
*
* = How mssdemux works
* There is a gstmssmanifest.c utility that holds the manifest and parses
* and has functions to extract information from it. mssdemux received the
* manifest from its sink pad and starts processing it when it gets EOS.
*
* The Manifest is parsed and the streams are exposed, 1 pad for each, with
* a initially selected QualityLevel. Each stream starts its own GstTaks that
* is responsible for downloading fragments and pushing them downstream.
*
* When a new connection-speed is set, mssdemux evaluates the available
* QualityLevels and might decide to switch to another one. In this case it
* pushes a new GstCaps event indicating the new caps on the pads.
*
* All operations that intend to update the GstTasks state should be protected
* with the GST_OBJECT_LOCK.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst/gst-i18n-plugin.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gstmssdemux.h"
GST_DEBUG_CATEGORY (mssdemux_debug);
#define DEFAULT_MAX_QUEUE_SIZE_BUFFERS 0
#define DEFAULT_BITRATE_LIMIT 0.8
enum
{
PROP_0,
PROP_MAX_QUEUE_SIZE_BUFFERS,
PROP_LAST
};
static GstStaticPadTemplate gst_mss_demux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/vnd.ms-sstr+xml")
);
static GstStaticPadTemplate gst_mss_demux_videosrc_template =
GST_STATIC_PAD_TEMPLATE ("video_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_mss_demux_audiosrc_template =
GST_STATIC_PAD_TEMPLATE ("audio_%02u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
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#define gst_mss_demux_parent_class parent_class
G_DEFINE_TYPE (GstMssDemux, gst_mss_demux, GST_TYPE_ADAPTIVE_DEMUX);
static void gst_mss_demux_dispose (GObject * object);
static void gst_mss_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_mss_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_mss_demux_is_live (GstAdaptiveDemux * demux);
static gboolean gst_mss_demux_process_manifest (GstAdaptiveDemux * demux,
GstBuffer * buffer);
static GstClockTime gst_mss_demux_get_duration (GstAdaptiveDemux * demux);
static void gst_mss_demux_reset (GstAdaptiveDemux * demux);
static GstFlowReturn gst_mss_demux_stream_seek (GstAdaptiveDemuxStream * stream,
gboolean forward, GstSeekFlags flags, GstClockTime ts,
GstClockTime * final_ts);
static gboolean gst_mss_demux_stream_has_next_fragment (GstAdaptiveDemuxStream *
stream);
static GstFlowReturn
gst_mss_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream);
static gboolean gst_mss_demux_stream_select_bitrate (GstAdaptiveDemuxStream *
stream, guint64 bitrate);
static GstFlowReturn
gst_mss_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream);
static gboolean gst_mss_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek);
static gint64
gst_mss_demux_get_manifest_update_interval (GstAdaptiveDemux * demux);
static GstFlowReturn
gst_mss_demux_update_manifest_data (GstAdaptiveDemux * demux,
GstBuffer * buffer);
static void
gst_mss_demux_class_init (GstMssDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstAdaptiveDemuxClass *gstadaptivedemux_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstadaptivedemux_class = (GstAdaptiveDemuxClass *) klass;
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_videosrc_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_mss_demux_audiosrc_template));
gst_element_class_set_static_metadata (gstelement_class,
"Smooth Streaming demuxer", "Codec/Demuxer/Adaptive",
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"Parse and demultiplex a Smooth Streaming manifest into audio and video "
"streams", "Thiago Santos <thiago.sousa.santos@collabora.com>");
gobject_class->dispose = gst_mss_demux_dispose;
gobject_class->set_property = gst_mss_demux_set_property;
gobject_class->get_property = gst_mss_demux_get_property;
#ifndef GST_REMOVE_DEPRECATED
g_object_class_install_property (gobject_class, PROP_MAX_QUEUE_SIZE_BUFFERS,
g_param_spec_uint ("max-queue-size-buffers", "Max queue size in buffers",
"Maximum buffers that can be stored in each internal stream queue "
"(0 = infinite) (deprecated)", 0, G_MAXUINT,
DEFAULT_MAX_QUEUE_SIZE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_DEPRECATED));
#endif
gstadaptivedemux_class->process_manifest = gst_mss_demux_process_manifest;
gstadaptivedemux_class->is_live = gst_mss_demux_is_live;
gstadaptivedemux_class->get_duration = gst_mss_demux_get_duration;
gstadaptivedemux_class->get_manifest_update_interval =
gst_mss_demux_get_manifest_update_interval;
gstadaptivedemux_class->reset = gst_mss_demux_reset;
gstadaptivedemux_class->seek = gst_mss_demux_seek;
gstadaptivedemux_class->stream_seek = gst_mss_demux_stream_seek;
gstadaptivedemux_class->stream_advance_fragment =
gst_mss_demux_stream_advance_fragment;
gstadaptivedemux_class->stream_has_next_fragment =
gst_mss_demux_stream_has_next_fragment;
gstadaptivedemux_class->stream_select_bitrate =
gst_mss_demux_stream_select_bitrate;
gstadaptivedemux_class->stream_update_fragment_info =
gst_mss_demux_stream_update_fragment_info;
gstadaptivedemux_class->update_manifest_data =
gst_mss_demux_update_manifest_data;
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GST_DEBUG_CATEGORY_INIT (mssdemux_debug, "mssdemux", 0, "mssdemux plugin");
}
static void
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gst_mss_demux_init (GstMssDemux * mssdemux)
{
mssdemux->data_queue_max_size = DEFAULT_MAX_QUEUE_SIZE_BUFFERS;
gst_adaptive_demux_set_stream_struct_size (GST_ADAPTIVE_DEMUX_CAST (mssdemux),
sizeof (GstMssDemuxStream));
}
static void
gst_mss_demux_reset (GstAdaptiveDemux * demux)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
if (mssdemux->manifest) {
gst_mss_manifest_free (mssdemux->manifest);
mssdemux->manifest = NULL;
}
g_free (mssdemux->base_url);
mssdemux->base_url = NULL;
mssdemux->n_videos = mssdemux->n_audios = 0;
}
static void
gst_mss_demux_dispose (GObject * object)
{
gst_mss_demux_reset (GST_ADAPTIVE_DEMUX_CAST (object));
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_mss_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX (object);
switch (prop_id) {
case PROP_MAX_QUEUE_SIZE_BUFFERS:
mssdemux->data_queue_max_size = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_mss_demux_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX (object);
switch (prop_id) {
case PROP_MAX_QUEUE_SIZE_BUFFERS:
g_value_set_uint (value, mssdemux->data_queue_max_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_mss_demux_is_live (GstAdaptiveDemux * demux)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
g_return_val_if_fail (mssdemux->manifest != NULL, FALSE);
return gst_mss_manifest_is_live (mssdemux->manifest);
}
static GstClockTime
gst_mss_demux_get_duration (GstAdaptiveDemux * demux)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
g_return_val_if_fail (mssdemux->manifest != NULL, FALSE);
return gst_mss_manifest_get_gst_duration (mssdemux->manifest);
}
static GstFlowReturn
gst_mss_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream)
{
GstMssDemuxStream *mssstream = (GstMssDemuxStream *) stream;
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (stream->demux);
GstFlowReturn ret;
gchar *path = NULL;
gst_adaptive_demux_stream_fragment_clear (&stream->fragment);
ret = gst_mss_stream_get_fragment_url (mssstream->manifest_stream, &path);
if (ret == GST_FLOW_OK) {
stream->fragment.uri = g_strdup_printf ("%s/%s", mssdemux->base_url, path);
stream->fragment.timestamp =
gst_mss_stream_get_fragment_gst_timestamp (mssstream->manifest_stream);
stream->fragment.duration =
gst_mss_stream_get_fragment_gst_duration (mssstream->manifest_stream);
}
g_free (path);
return ret;
}
static GstFlowReturn
gst_mss_demux_stream_seek (GstAdaptiveDemuxStream * stream, gboolean forward,
GstSeekFlags flags, GstClockTime ts, GstClockTime * final_ts)
{
GstMssDemuxStream *mssstream = (GstMssDemuxStream *) stream;
gst_mss_stream_seek (mssstream->manifest_stream, forward, flags, ts,
final_ts);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mss_demux_stream_advance_fragment (GstAdaptiveDemuxStream * stream)
{
GstMssDemuxStream *mssstream = (GstMssDemuxStream *) stream;
if (stream->demux->segment.rate >= 0)
return gst_mss_stream_advance_fragment (mssstream->manifest_stream);
else
return gst_mss_stream_regress_fragment (mssstream->manifest_stream);
}
static GstCaps *
create_mss_caps (GstMssDemuxStream * stream, GstCaps * caps)
{
return gst_caps_new_simple ("video/quicktime", "variant", G_TYPE_STRING,
"mss-fragmented", "timescale", G_TYPE_UINT64,
gst_mss_stream_get_timescale (stream->manifest_stream), "media-caps",
GST_TYPE_CAPS, caps, NULL);
}
static GstPad *
_create_pad (GstMssDemux * mssdemux, GstMssStream * manifeststream)
{
gchar *name = NULL;
GstPad *srcpad = NULL;
GstMssStreamType streamtype;
GstPadTemplate *tmpl = NULL;
streamtype = gst_mss_stream_get_type (manifeststream);
GST_DEBUG_OBJECT (mssdemux, "Found stream of type: %s",
gst_mss_stream_type_name (streamtype));
/* TODO use stream's name/bitrate/index as the pad name? */
if (streamtype == MSS_STREAM_TYPE_VIDEO) {
name = g_strdup_printf ("video_%02u", mssdemux->n_videos++);
tmpl = gst_static_pad_template_get (&gst_mss_demux_videosrc_template);
} else if (streamtype == MSS_STREAM_TYPE_AUDIO) {
name = g_strdup_printf ("audio_%02u", mssdemux->n_audios++);
tmpl = gst_static_pad_template_get (&gst_mss_demux_audiosrc_template);
}
if (tmpl != NULL) {
srcpad = GST_PAD_CAST (gst_pad_new_from_template (tmpl, name));
g_free (name);
gst_object_unref (tmpl);
}
if (!srcpad) {
GST_WARNING_OBJECT (mssdemux, "Ignoring unknown type stream");
return NULL;
}
return srcpad;
}
static void
gst_mss_demux_apply_protection_system (GstCaps * caps,
const gchar * selected_system)
{
GstStructure *s;
g_return_if_fail (selected_system);
s = gst_caps_get_structure (caps, 0);
gst_structure_set (s,
"original-media-type", G_TYPE_STRING, gst_structure_get_name (s),
GST_PROTECTION_SYSTEM_ID_CAPS_FIELD, G_TYPE_STRING, selected_system,
NULL);
gst_structure_set_name (s, "application/x-cenc");
}
static gboolean
gst_mss_demux_setup_streams (GstAdaptiveDemux * demux)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
GSList *streams = gst_mss_manifest_get_streams (mssdemux->manifest);
GSList *active_streams = NULL;
GSList *iter;
const gchar *protection_system_id =
gst_mss_manifest_get_protection_system_id (mssdemux->manifest);
const gchar *protection_data =
gst_mss_manifest_get_protection_data (mssdemux->manifest);
gboolean protected = protection_system_id && protection_data;
const gchar *selected_system = NULL;
if (streams == NULL) {
GST_INFO_OBJECT (mssdemux, "No streams found in the manifest");
GST_ELEMENT_ERROR (mssdemux, STREAM, DEMUX,
(_("This file contains no playable streams.")),
("no streams found at the Manifest"));
return FALSE;
}
if (protected) {
const gchar *sys_ids[2] = { protection_system_id, NULL };
selected_system = gst_protection_select_system (sys_ids);
if (!selected_system) {
GST_ERROR_OBJECT (mssdemux, "stream is protected, but no "
"suitable decryptor element has been found");
return FALSE;
}
}
GST_INFO_OBJECT (mssdemux, "Changing max bitrate to %u",
demux->connection_speed);
gst_mss_manifest_change_bitrate (mssdemux->manifest, demux->connection_speed);
GST_INFO_OBJECT (mssdemux, "Activating streams");
for (iter = streams; iter; iter = g_slist_next (iter)) {
GstPad *srcpad = NULL;
GstMssDemuxStream *stream = NULL;
GstMssStream *manifeststream = iter->data;
srcpad = _create_pad (mssdemux, manifeststream);
if (!srcpad) {
continue;
}
stream = (GstMssDemuxStream *)
gst_adaptive_demux_stream_new (GST_ADAPTIVE_DEMUX_CAST (mssdemux),
srcpad);
stream->manifest_stream = manifeststream;
gst_mss_stream_set_active (manifeststream, TRUE);
active_streams = g_slist_prepend (active_streams, stream);
}
GST_INFO_OBJECT (mssdemux, "Changing max bitrate to %u",
demux->connection_speed);
gst_mss_manifest_change_bitrate (mssdemux->manifest, demux->connection_speed);
for (iter = active_streams; iter; iter = g_slist_next (iter)) {
GstMssDemuxStream *stream = iter->data;
GstCaps *caps;
const gchar *lang;
caps = gst_mss_stream_get_caps (stream->manifest_stream);
if (protected) {
gst_mss_demux_apply_protection_system (caps, selected_system);
}
gst_adaptive_demux_stream_set_caps (GST_ADAPTIVE_DEMUX_STREAM_CAST (stream),
create_mss_caps (stream, caps));
gst_caps_unref (caps);
lang = gst_mss_stream_get_lang (stream->manifest_stream);
if (lang != NULL) {
GstTagList *tags;
tags = gst_tag_list_new (GST_TAG_LANGUAGE_CODE, lang, NULL);
gst_adaptive_demux_stream_set_tags (GST_ADAPTIVE_DEMUX_STREAM_CAST
(stream), tags);
}
if (protected) {
gsize protection_data_len;
guchar *decoded_data =
g_base64_decode (protection_data, &protection_data_len);
GstBuffer *protection_buffer =
gst_buffer_new_wrapped (decoded_data, protection_data_len);
GstEvent *event =
gst_event_new_protection (protection_system_id, protection_buffer,
"smooth-streaming");
GST_LOG_OBJECT (stream, "Queuing Protection event on source pad");
gst_adaptive_demux_stream_queue_event ((GstAdaptiveDemuxStream *) stream,
event);
gst_buffer_unref (protection_buffer);
}
}
g_slist_free (active_streams);
return TRUE;
}
static void
gst_mss_demux_update_base_url (GstMssDemux * mssdemux)
{
GstAdaptiveDemux *demux = GST_ADAPTIVE_DEMUX_CAST (mssdemux);
gchar *baseurl_end;
g_free (mssdemux->base_url);
mssdemux->base_url =
g_strdup (demux->manifest_base_uri ? demux->manifest_base_uri : demux->
manifest_uri);
baseurl_end = g_strrstr (mssdemux->base_url, "/Manifest");
if (baseurl_end == NULL) {
/* second try */
baseurl_end = g_strrstr (mssdemux->base_url, "/manifest");
}
if (baseurl_end) {
/* set the new end of the string */
baseurl_end[0] = '\0';
} else {
GST_WARNING_OBJECT (mssdemux, "Stream's URI didn't end with /manifest");
}
}
static gboolean
gst_mss_demux_process_manifest (GstAdaptiveDemux * demux, GstBuffer * buf)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
gst_mss_demux_update_base_url (mssdemux);
mssdemux->manifest = gst_mss_manifest_new (buf);
if (!mssdemux->manifest) {
GST_ELEMENT_ERROR (mssdemux, STREAM, FORMAT, ("Bad manifest file"),
("Xml manifest file couldn't be parsed"));
return FALSE;
}
return gst_mss_demux_setup_streams (demux);
}
static gboolean
gst_mss_demux_stream_select_bitrate (GstAdaptiveDemuxStream * stream,
guint64 bitrate)
{
GstMssDemuxStream *mssstream = (GstMssDemuxStream *) stream;
gboolean ret = FALSE;
GST_DEBUG_OBJECT (stream->pad,
"Using stream download bitrate %" G_GUINT64_FORMAT, bitrate);
if (gst_mss_stream_select_bitrate (mssstream->manifest_stream, bitrate)) {
GstCaps *caps;
GstCaps *msscaps;
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (stream->demux);
const gchar *protection_system_id =
gst_mss_manifest_get_protection_system_id (mssdemux->manifest);
const gchar *protection_data =
gst_mss_manifest_get_protection_data (mssdemux->manifest);
gboolean protected = protection_system_id && protection_data;
caps = gst_mss_stream_get_caps (mssstream->manifest_stream);
GST_DEBUG_OBJECT (stream->pad,
"Starting streams reconfiguration due to bitrate changes");
if (protected) {
const gchar *sys_ids[2] = { protection_system_id, NULL };
const gchar *selected_system = gst_protection_select_system (sys_ids);
if (!selected_system) {
GST_ERROR_OBJECT (mssdemux, "stream is protected, but no "
"suitable decryptor element has been found");
return FALSE;
}
gst_mss_demux_apply_protection_system (caps, selected_system);
}
msscaps = create_mss_caps (mssstream, caps);
GST_DEBUG_OBJECT (stream->pad,
"Stream changed bitrate to %" G_GUINT64_FORMAT " caps: %"
GST_PTR_FORMAT,
gst_mss_stream_get_current_bitrate (mssstream->manifest_stream), caps);
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gst_caps_unref (caps);
gst_adaptive_demux_stream_set_caps (stream, msscaps);
ret = TRUE;
GST_DEBUG_OBJECT (stream->pad, "Finished streams reconfiguration");
}
return ret;
}
#define SEEK_UPDATES_PLAY_POSITION(r, start_type, stop_type) \
((r >= 0 && start_type != GST_SEEK_TYPE_NONE) || \
(r < 0 && stop_type != GST_SEEK_TYPE_NONE))
static gboolean
gst_mss_demux_seek (GstAdaptiveDemux * demux, GstEvent * seek)
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
gst_event_parse_seek (seek, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
GST_DEBUG_OBJECT (mssdemux,
"seek event, rate: %f start: %" GST_TIME_FORMAT " stop: %"
GST_TIME_FORMAT, rate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop));
if (SEEK_UPDATES_PLAY_POSITION (rate, start_type, stop_type)) {
if (rate >= 0)
gst_mss_manifest_seek (mssdemux->manifest, rate >= 0, start);
else
gst_mss_manifest_seek (mssdemux->manifest, rate >= 0, stop);
}
return TRUE;
}
static gboolean
gst_mss_demux_stream_has_next_fragment (GstAdaptiveDemuxStream * stream)
{
GstMssDemuxStream *mssstream = (GstMssDemuxStream *) stream;
return gst_mss_stream_has_next_fragment (mssstream->manifest_stream);
}
static gint64
gst_mss_demux_get_manifest_update_interval (GstAdaptiveDemux * demux)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
GstClockTime interval;
/* Not much information about this in the MSS spec. It seems that
* the fragments contain an UUID box that should tell the next
* fragments time and duration so one wouldn't need to fetch
* the Manifest again, but we need a fallback here. So use 2 times
* the current fragment duration */
interval = gst_mss_manifest_get_min_fragment_duration (mssdemux->manifest);
if (!GST_CLOCK_TIME_IS_VALID (interval))
interval = 2 * GST_SECOND; /* default to 2 seconds */
interval = 2 * (interval / GST_USECOND);
return interval;
}
static GstFlowReturn
gst_mss_demux_update_manifest_data (GstAdaptiveDemux * demux,
GstBuffer * buffer)
{
GstMssDemux *mssdemux = GST_MSS_DEMUX_CAST (demux);
gst_mss_demux_update_base_url (mssdemux);
gst_mss_manifest_reload_fragments (mssdemux->manifest, buffer);
return GST_FLOW_OK;
}