dlls/winegstreamer/gst_cbs.c

   1 /*
   2  * Copyright 2015 Andrew Eikum for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20
  21 #include <gst/gst.h>
  22
  23 #include "wine/list.h"
  24
  25 #include "gst_cbs.h"
  26
  27 /* gstreamer calls our callbacks from threads that Wine did not create. Some
  28  * callbacks execute code which requires Wine to have created the thread
  29  * (critical sections, debug logging, dshow client code). Since gstreamer can't
  30  * provide an API to override its thread creation, we have to intercept all
  31  * callbacks in code which avoids the Wine thread requirement, and then
  32  * dispatch those callbacks on a thread that is known to be created by Wine.
  33  *
  34  * This file must not contain any code that depends on the Wine TEB!
  35  */
  36
  37 static void call_cb(struct cb_data *cbdata)
  38 {
  39     pthread_mutex_init(&cbdata->lock, NULL);
  40     pthread_cond_init(&cbdata->cond, NULL);
  41     cbdata->finished = 0;
  42
  43     if(is_wine_thread()){
  44         /* The thread which triggered gstreamer to call this callback may
  45          * already hold a critical section. If so, executing the callback on a
  46          * worker thread can cause a deadlock. If  we are already on a Wine
  47          * thread, then there is no need to run this callback on a worker
  48          * thread anyway, which avoids the deadlock issue. */
  49         perform_cb(NULL, cbdata);
  50
  51         pthread_cond_destroy(&cbdata->cond);
  52         pthread_mutex_destroy(&cbdata->lock);
  53
  54         return;
  55     }
  56
  57     pthread_mutex_lock(&cb_list_lock);
  58
  59     list_add_tail(&cb_list, &cbdata->entry);
  60     pthread_cond_broadcast(&cb_list_cond);
  61
  62     pthread_mutex_lock(&cbdata->lock);
  63
  64     pthread_mutex_unlock(&cb_list_lock);
  65
  66     while(!cbdata->finished)
  67         pthread_cond_wait(&cbdata->cond, &cbdata->lock);
  68
  69     pthread_mutex_unlock(&cbdata->lock);
  70
  71     pthread_cond_destroy(&cbdata->cond);
  72     pthread_mutex_destroy(&cbdata->lock);
  73 }
  74
  75 GstBusSyncReply watch_bus_wrapper(GstBus *bus, GstMessage *msg, gpointer user)
  76 {
  77     struct cb_data cbdata = { WATCH_BUS };
  78
  79     cbdata.u.watch_bus_data.bus = bus;
  80     cbdata.u.watch_bus_data.msg = msg;
  81     cbdata.u.watch_bus_data.user = user;
  82
  83     call_cb(&cbdata);
  84
  85     return cbdata.u.watch_bus_data.ret;
  86 }
  87
  88 void existing_new_pad_wrapper(GstElement *bin, GstPad *pad, gpointer user)
  89 {
  90     struct cb_data cbdata = { EXISTING_NEW_PAD };
  91
  92     cbdata.u.existing_new_pad_data.bin = bin;
  93     cbdata.u.existing_new_pad_data.pad = pad;
  94     cbdata.u.existing_new_pad_data.user = user;
  95
  96     call_cb(&cbdata);
  97 }
  98
  99 gboolean query_function_wrapper(GstPad *pad, GstObject *parent, GstQuery *query)
 100 {
 101     struct cb_data cbdata = { QUERY_FUNCTION };
 102
 103     cbdata.u.query_function_data.pad = pad;
 104     cbdata.u.query_function_data.parent = parent;
 105     cbdata.u.query_function_data.query = query;
 106
 107     call_cb(&cbdata);
 108
 109     return cbdata.u.query_function_data.ret;
 110 }
 111
 112 gboolean activate_mode_wrapper(GstPad *pad, GstObject *parent, GstPadMode mode, gboolean activate)
 113 {
 114     struct cb_data cbdata = { ACTIVATE_MODE };
 115
 116     cbdata.u.activate_mode_data.pad = pad;
 117     cbdata.u.activate_mode_data.parent = parent;
 118     cbdata.u.activate_mode_data.mode = mode;
 119     cbdata.u.activate_mode_data.activate = activate;
 120
 121     call_cb(&cbdata);
 122
 123     return cbdata.u.activate_mode_data.ret;
 124 }
 125
 126 void no_more_pads_wrapper(GstElement *decodebin, gpointer user)
 127 {
 128     struct cb_data cbdata = { NO_MORE_PADS };
 129
 130     cbdata.u.no_more_pads_data.decodebin = decodebin;
 131     cbdata.u.no_more_pads_data.user = user;
 132
 133     call_cb(&cbdata);
 134 }
 135
 136 GstFlowReturn request_buffer_src_wrapper(GstPad *pad, GstObject *parent, guint64 ofs, guint len,
 137         GstBuffer **buf)
 138 {
 139     struct cb_data cbdata = { REQUEST_BUFFER_SRC };
 140
 141     cbdata.u.request_buffer_src_data.pad = pad;
 142     cbdata.u.request_buffer_src_data.parent = parent;
 143     cbdata.u.request_buffer_src_data.ofs = ofs;
 144     cbdata.u.request_buffer_src_data.len = len;
 145     cbdata.u.request_buffer_src_data.buf = buf;
 146
 147     call_cb(&cbdata);
 148
 149     return cbdata.u.request_buffer_src_data.ret;
 150 }
 151
 152 gboolean event_src_wrapper(GstPad *pad, GstObject *parent, GstEvent *event)
 153 {
 154     struct cb_data cbdata = { EVENT_SRC };
 155
 156     cbdata.u.event_src_data.pad = pad;
 157     cbdata.u.event_src_data.parent = parent;
 158     cbdata.u.event_src_data.event = event;
 159
 160     call_cb(&cbdata);
 161
 162     return cbdata.u.event_src_data.ret;
 163 }
 164
 165 gboolean event_sink_wrapper(GstPad *pad, GstObject *parent, GstEvent *event)
 166 {
 167     struct cb_data cbdata = { EVENT_SINK };
 168
 169     cbdata.u.event_sink_data.pad = pad;
 170     cbdata.u.event_sink_data.parent = parent;
 171     cbdata.u.event_sink_data.event = event;
 172
 173     call_cb(&cbdata);
 174
 175     return cbdata.u.event_sink_data.ret;
 176 }
 177
 178 GstFlowReturn got_data_sink_wrapper(GstPad *pad, GstObject *parent, GstBuffer *buf)
 179 {
 180     struct cb_data cbdata = { GOT_DATA_SINK };
 181
 182     cbdata.u.got_data_sink_data.pad = pad;
 183     cbdata.u.got_data_sink_data.parent = parent;
 184     cbdata.u.got_data_sink_data.buf = buf;
 185
 186     call_cb(&cbdata);
 187
 188     return cbdata.u.got_data_sink_data.ret;
 189 }
 190
 191 GstFlowReturn got_data_wrapper(GstPad *pad, GstObject *parent, GstBuffer *buf)
 192 {
 193     struct cb_data cbdata = { GOT_DATA };
 194
 195     cbdata.u.got_data_data.pad = pad;
 196     cbdata.u.got_data_data.parent = parent;
 197     cbdata.u.got_data_data.buf = buf;
 198
 199     call_cb(&cbdata);
 200
 201     return cbdata.u.got_data_data.ret;
 202 }
 203
 204 void removed_decoded_pad_wrapper(GstElement *bin, GstPad *pad, gpointer user)
 205 {
 206     struct cb_data cbdata = { REMOVED_DECODED_PAD };
 207
 208     cbdata.u.removed_decoded_pad_data.bin = bin;
 209     cbdata.u.removed_decoded_pad_data.pad = pad;
 210     cbdata.u.removed_decoded_pad_data.user = user;
 211
 212     call_cb(&cbdata);
 213 }
 214
 215 GstAutoplugSelectResult autoplug_blacklist_wrapper(GstElement *bin, GstPad *pad,
 216         GstCaps *caps, GstElementFactory *fact, gpointer user)
 217 {
 218     struct cb_data cbdata = { AUTOPLUG_BLACKLIST };
 219
 220     cbdata.u.autoplug_blacklist_data.bin = bin;
 221     cbdata.u.autoplug_blacklist_data.pad = pad;
 222     cbdata.u.autoplug_blacklist_data.caps = caps;
 223     cbdata.u.autoplug_blacklist_data.fact = fact;
 224     cbdata.u.autoplug_blacklist_data.user = user;
 225
 226     call_cb(&cbdata);
 227
 228     return cbdata.u.autoplug_blacklist_data.ret;
 229 }
 230
 231 void unknown_type_wrapper(GstElement *bin, GstPad *pad, GstCaps *caps, gpointer user)
 232 {
 233     struct cb_data cbdata = { UNKNOWN_TYPE };
 234
 235     cbdata.u.unknown_type_data.bin = bin;
 236     cbdata.u.unknown_type_data.pad = pad;
 237     cbdata.u.unknown_type_data.caps = caps;
 238     cbdata.u.unknown_type_data.user = user;
 239
 240     call_cb(&cbdata);
 241 }
 242
 243 void release_sample_wrapper(gpointer data)
 244 {
 245     struct cb_data cbdata = { RELEASE_SAMPLE };
 246
 247     cbdata.u.release_sample_data.data = data;
 248
 249     call_cb(&cbdata);
 250 }
 251
 252 void Gstreamer_transform_pad_added_wrapper(GstElement *filter, GstPad *pad, gpointer user)
 253 {
 254     struct cb_data cbdata = { TRANSFORM_PAD_ADDED };
 255
 256     cbdata.u.transform_pad_added_data.filter = filter;
 257     cbdata.u.transform_pad_added_data.pad = pad;
 258     cbdata.u.transform_pad_added_data.user = user;
 259
 260     call_cb(&cbdata);
 261 }
 262
 263 gboolean query_sink_wrapper(GstPad *pad, GstObject *parent, GstQuery *query)
 264 {
 265     struct cb_data cbdata = { QUERY_SINK };
 266
 267     cbdata.u.query_sink_data.pad = pad;
 268     cbdata.u.query_sink_data.parent = parent;
 269     cbdata.u.query_sink_data.query = query;
 270
 271     call_cb(&cbdata);
 272
 273     return cbdata.u.query_sink_data.ret;
 274 }