Sweden-Number/dlls/winegstreamer/gst_cbs.c

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/*
* Copyright 2015 Andrew Eikum for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <gst/gst.h>
#include "objbase.h"
#include "wine/list.h"
#include "gst_cbs.h"
static pthread_key_t wine_gst_key;
void mark_wine_thread(void)
{
/* set it to non-NULL to indicate that this is a Wine thread */
pthread_setspecific(wine_gst_key, &wine_gst_key);
}
static BOOL is_wine_thread(void)
{
return pthread_getspecific(wine_gst_key) != NULL;
}
static pthread_mutex_t cb_list_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cb_list_cond = PTHREAD_COND_INITIALIZER;
static struct list cb_list = LIST_INIT(cb_list);
static void CALLBACK perform_cb(TP_CALLBACK_INSTANCE *instance, void *user)
{
struct cb_data *cbdata = user;
if (cbdata->type < GSTDEMUX_MAX)
perform_cb_gstdemux(cbdata);
pthread_mutex_lock(&cbdata->lock);
cbdata->finished = 1;
pthread_cond_broadcast(&cbdata->cond);
pthread_mutex_unlock(&cbdata->lock);
}
static DWORD WINAPI dispatch_thread(void *user)
{
struct cb_data *cbdata;
CoInitializeEx(NULL, COINIT_MULTITHREADED);
pthread_mutex_lock(&cb_list_lock);
while (1)
{
while (list_empty(&cb_list)) pthread_cond_wait(&cb_list_cond, &cb_list_lock);
cbdata = LIST_ENTRY(list_head(&cb_list), struct cb_data, entry);
list_remove(&cbdata->entry);
TrySubmitThreadpoolCallback(&perform_cb, cbdata, NULL);
}
pthread_mutex_unlock(&cb_list_lock);
CoUninitialize();
return 0;
}
void start_dispatch_thread(void)
{
pthread_key_create(&wine_gst_key, NULL);
CloseHandle(CreateThread(NULL, 0, &dispatch_thread, NULL, 0, NULL));
}
/* gstreamer calls our callbacks from threads that Wine did not create. Some
* callbacks execute code which requires Wine to have created the thread
* (critical sections, debug logging, dshow client code). Since gstreamer can't
* provide an API to override its thread creation, we have to intercept all
* callbacks in code which avoids the Wine thread requirement, and then
* dispatch those callbacks on a thread that is known to be created by Wine.
*
* This thread must not run any code that depends on the Wine TEB!
*/
static void call_cb(struct cb_data *cbdata)
{
pthread_mutex_init(&cbdata->lock, NULL);
pthread_cond_init(&cbdata->cond, NULL);
cbdata->finished = 0;
if(is_wine_thread()){
/* The thread which triggered gstreamer to call this callback may
* already hold a critical section. If so, executing the callback on a
* worker thread can cause a deadlock. If we are already on a Wine
* thread, then there is no need to run this callback on a worker
* thread anyway, which avoids the deadlock issue. */
perform_cb(NULL, cbdata);
pthread_cond_destroy(&cbdata->cond);
pthread_mutex_destroy(&cbdata->lock);
return;
}
pthread_mutex_lock(&cb_list_lock);
list_add_tail(&cb_list, &cbdata->entry);
pthread_cond_broadcast(&cb_list_cond);
pthread_mutex_lock(&cbdata->lock);
pthread_mutex_unlock(&cb_list_lock);
while(!cbdata->finished)
pthread_cond_wait(&cbdata->cond, &cbdata->lock);
pthread_mutex_unlock(&cbdata->lock);
pthread_cond_destroy(&cbdata->cond);
pthread_mutex_destroy(&cbdata->lock);
}
GstBusSyncReply watch_bus_wrapper(GstBus *bus, GstMessage *msg, gpointer user)
{
struct cb_data cbdata = { WATCH_BUS };
cbdata.u.watch_bus_data.bus = bus;
cbdata.u.watch_bus_data.msg = msg;
cbdata.u.watch_bus_data.user = user;
call_cb(&cbdata);
return cbdata.u.watch_bus_data.ret;
}
void existing_new_pad_wrapper(GstElement *bin, GstPad *pad, gpointer user)
{
struct cb_data cbdata = { EXISTING_NEW_PAD };
cbdata.u.pad_added_data.element = bin;
cbdata.u.pad_added_data.pad = pad;
cbdata.u.pad_added_data.user = user;
call_cb(&cbdata);
}
gboolean query_function_wrapper(GstPad *pad, GstObject *parent, GstQuery *query)
{
struct cb_data cbdata = { QUERY_FUNCTION };
cbdata.u.query_function_data.pad = pad;
cbdata.u.query_function_data.parent = parent;
cbdata.u.query_function_data.query = query;
call_cb(&cbdata);
return cbdata.u.query_function_data.ret;
}
gboolean activate_mode_wrapper(GstPad *pad, GstObject *parent, GstPadMode mode, gboolean activate)
{
struct cb_data cbdata = { ACTIVATE_MODE };
cbdata.u.activate_mode_data.pad = pad;
cbdata.u.activate_mode_data.parent = parent;
cbdata.u.activate_mode_data.mode = mode;
cbdata.u.activate_mode_data.activate = activate;
call_cb(&cbdata);
return cbdata.u.activate_mode_data.ret;
}
void no_more_pads_wrapper(GstElement *element, gpointer user)
{
struct cb_data cbdata = { NO_MORE_PADS };
cbdata.u.no_more_pads_data.element = element;
cbdata.u.no_more_pads_data.user = user;
call_cb(&cbdata);
}
GstFlowReturn request_buffer_src_wrapper(GstPad *pad, GstObject *parent, guint64 ofs, guint len,
GstBuffer **buf)
{
struct cb_data cbdata = { REQUEST_BUFFER_SRC };
cbdata.u.getrange_data.pad = pad;
cbdata.u.getrange_data.parent = parent;
cbdata.u.getrange_data.ofs = ofs;
cbdata.u.getrange_data.len = len;
cbdata.u.getrange_data.buf = buf;
call_cb(&cbdata);
return cbdata.u.getrange_data.ret;
}
gboolean event_src_wrapper(GstPad *pad, GstObject *parent, GstEvent *event)
{
struct cb_data cbdata = { EVENT_SRC };
cbdata.u.event_src_data.pad = pad;
cbdata.u.event_src_data.parent = parent;
cbdata.u.event_src_data.event = event;
call_cb(&cbdata);
return cbdata.u.event_src_data.ret;
}
gboolean event_sink_wrapper(GstPad *pad, GstObject *parent, GstEvent *event)
{
struct cb_data cbdata = { EVENT_SINK };
cbdata.u.event_sink_data.pad = pad;
cbdata.u.event_sink_data.parent = parent;
cbdata.u.event_sink_data.event = event;
call_cb(&cbdata);
return cbdata.u.event_sink_data.ret;
}
GstFlowReturn got_data_sink_wrapper(GstPad *pad, GstObject *parent, GstBuffer *buf)
{
struct cb_data cbdata = { GOT_DATA_SINK };
cbdata.u.got_data_sink_data.pad = pad;
cbdata.u.got_data_sink_data.parent = parent;
cbdata.u.got_data_sink_data.buf = buf;
call_cb(&cbdata);
return cbdata.u.got_data_sink_data.ret;
}
void removed_decoded_pad_wrapper(GstElement *bin, GstPad *pad, gpointer user)
{
struct cb_data cbdata = { REMOVED_DECODED_PAD };
cbdata.u.pad_removed_data.element = bin;
cbdata.u.pad_removed_data.pad = pad;
cbdata.u.pad_removed_data.user = user;
call_cb(&cbdata);
}
GstAutoplugSelectResult autoplug_blacklist_wrapper(GstElement *bin, GstPad *pad,
GstCaps *caps, GstElementFactory *fact, gpointer user)
{
struct cb_data cbdata = { AUTOPLUG_BLACKLIST };
cbdata.u.autoplug_blacklist_data.bin = bin;
cbdata.u.autoplug_blacklist_data.pad = pad;
cbdata.u.autoplug_blacklist_data.caps = caps;
cbdata.u.autoplug_blacklist_data.fact = fact;
cbdata.u.autoplug_blacklist_data.user = user;
call_cb(&cbdata);
return cbdata.u.autoplug_blacklist_data.ret;
}
void unknown_type_wrapper(GstElement *bin, GstPad *pad, GstCaps *caps, gpointer user)
{
struct cb_data cbdata = { UNKNOWN_TYPE };
cbdata.u.unknown_type_data.bin = bin;
cbdata.u.unknown_type_data.pad = pad;
cbdata.u.unknown_type_data.caps = caps;
cbdata.u.unknown_type_data.user = user;
call_cb(&cbdata);
}
gboolean query_sink_wrapper(GstPad *pad, GstObject *parent, GstQuery *query)
{
struct cb_data cbdata = { QUERY_SINK };
cbdata.u.query_sink_data.pad = pad;
cbdata.u.query_sink_data.parent = parent;
cbdata.u.query_sink_data.query = query;
call_cb(&cbdata);
return cbdata.u.query_sink_data.ret;
}