application/player.c

   1 /*
   2  * Copyright 2022 Olaf Wintermann
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include "player.h"
  24 #include "main.h"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/fcntl.h>
  30 #include <spawn.h>
  31 #include <sys/wait.h>
  32 #include <signal.h>
  33 #include <poll.h>
  34 #include <fcntl.h>
  35 #include <sys/stat.h>
  36 #include <errno.h>
  37 #include <sys/socket.h>
  38 #include <sys/un.h>
  39 #include <pthread.h>
  40
  41 #include "json.h"
  42 #include "settings.h"
  43
  44 extern char **environ;
  45
  46 #define STR_BUFSIZE 512
  47 #define WID_ARG_BUFSIZE 24
  48
  49 #define PLAYER_POLL_TIMEOUT 500
  50 #define PLAYER_IN_BUFSIZE   8192
  51
  52 static void json_print(JSONValue *value, char *name, int indent);
  53
  54 static void* start_player(void *data);
  55
  56 static void player_io(Player *p);
  57
  58 static void handle_json_rpc_msg(Player *player, JSONValue *v);
  59 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid);
  60 static void handle_json_rpc_event(Player *player, JSONValue *v, JSONValue *event);
  61
  62 void PlayerOpenFile(MainWindow *win) {
  63     pthread_t tid;
  64     if(pthread_create(&tid, NULL, start_player, win)) {
  65         perror("pthread_create");
  66     }
  67 }
  68
  69 static int prepare_player(Player *player, char *log_arg, char *ipc_arg) {
  70     // create tmp directory for IPC
  71     char *player_tmp = NULL;
  72     char buf[STR_BUFSIZE];
  73     snprintf(buf, STR_BUFSIZE, "/tmp/uwplayer-%x", rand());
  74     int mkdir_success = 0;
  75     for(int t=0;t<5;t++) {
  76         if(!mkdir(buf, S_IRWXU)) {
  77             mkdir_success = 1;
  78             break;
  79         } else if(errno != EEXIST) {
  80             break;
  81         }
  82     }
  83     if(!mkdir_success) return 1;
  84     player_tmp = strdup(buf);
  85     player->tmp = player_tmp;
  86
  87     // prepare log/ipc args and create log fifo
  88     int err = 0;
  89
  90     if(snprintf(log_arg, STR_BUFSIZE, "--log-file=%s/%s", player_tmp, "log.fifo") >= STR_BUFSIZE) {
  91         err = 1;
  92     }
  93     if(snprintf(ipc_arg, STR_BUFSIZE, "--input-ipc-server=%s/%s", player_tmp, "ipc.socket") >= STR_BUFSIZE) {
  94         err = 1;
  95     }
  96
  97     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player_tmp);
  98     if(err || mkfifo(buf, S_IRUSR|S_IWUSR)) {
  99         rmdir(player_tmp);
 100         return 1;
 101     }
 102
 103     return 0;
 104 }
 105
 106 static void* wait_for_process(void *data) {
 107     Player *player = data;
 108     int status = 0;
 109     waitpid(player->process, &status, 0);
 110
 111     player->isactive = FALSE;
 112     player->status = status;
 113
 114     return NULL;
 115 }
 116
 117 static int start_player_process(Player *player, MainWindow *win) {
 118     char log_arg[STR_BUFSIZE];
 119     char ipc_arg[STR_BUFSIZE];
 120
 121     if(prepare_player(player, log_arg, ipc_arg)) {
 122         return 1;
 123     }
 124
 125     char *player_bin = SettingsGetPlayerBin();
 126     if(!player_bin) {
 127         fprintf(stderr, "No mpv binary available\n");
 128         return 1;
 129     }
 130
 131     // -wid parameter value for embedding the player in the player_widget
 132     Window wid = XtWindow(win->player_widget);
 133     char wid_arg[WID_ARG_BUFSIZE];
 134     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
 135         return 1;
 136     }
 137
 138     // create player arg list
 139     char *args[32];
 140     args[0] = player_bin;
 141     args[1] = "-wid";
 142     args[2] = wid_arg;
 143     args[3] = "--no-terminal";
 144     args[4] = log_arg;
 145     args[5] = ipc_arg;
 146     args[6] = win->file;
 147     args[7] = NULL;
 148
 149     posix_spawn_file_actions_t actions;
 150     posix_spawn_file_actions_init(&actions);
 151
 152     //posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
 153     //posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
 154
 155     // start player
 156     pid_t player_pid;
 157     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
 158         perror("posix_spawn");
 159         return 1;
 160     }
 161     posix_spawn_file_actions_destroy(&actions);
 162
 163     player->process = player_pid;
 164     player->isactive = TRUE;
 165
 166     pthread_t tid;
 167     if(pthread_create(&tid, NULL, wait_for_process, player)) {
 168         perror("pthread_create");
 169     }
 170
 171     return 0;
 172 }
 173
 174 static int wait_for_ipc(Player *player) {
 175     char buf[STR_BUFSIZE];
 176     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player->tmp); // cannot fail
 177
 178     // open log
 179     int fd_log = open(buf, O_RDONLY);
 180     if(fd_log < 0) {
 181         perror("Cannot open log");
 182         return 1;
 183     }
 184     player->log = fd_log;
 185
 186     // read log until IPC socket is created
 187     char *scan_str = "Listening to IPC";
 188     int scan_pos = 0;
 189     int scan_len = strlen(scan_str);
 190     int ipc_listen = 0;
 191     ssize_t r;
 192     while((r = read(fd_log, buf, STR_BUFSIZE)) > 0) {
 193         for(int i=0;i<r;i++) {
 194             char c = buf[i];
 195             char *s_str = buf+i;
 196
 197             if(scan_pos == scan_len) {
 198                 ipc_listen = 1;
 199                 break;
 200             }
 201
 202             if(scan_str[scan_pos] == c) {
 203                 scan_pos++;
 204             } else {
 205                 scan_pos = 0;
 206             }
 207         }
 208         if(ipc_listen) break;
 209     }
 210
 211     return 0;
 212 }
 213
 214 static int connect_to_ipc(Player *player) {
 215     // connect to IPC socket
 216     int fd_ipc = socket(AF_UNIX, SOCK_STREAM, 0);
 217     if(fd_ipc < 0) {
 218         perror("Cannot create IPC socket");
 219         return 1;
 220     }
 221     player->ipc = fd_ipc;
 222
 223     char buf[STR_BUFSIZE];
 224     snprintf(buf, STR_BUFSIZE, "%s/%s", player->tmp, "ipc.socket"); // cannot fail
 225
 226     struct sockaddr_un ipc_addr;
 227     memset(&ipc_addr, 0, sizeof(struct sockaddr_un));
 228     ipc_addr.sun_family = AF_UNIX;
 229     memcpy(ipc_addr.sun_path, buf, strlen(buf));
 230     if(connect(fd_ipc, (struct sockaddr *)&ipc_addr, sizeof(ipc_addr)) == -1) {
 231         perror("Cannot connect to IPC socket");
 232         return 1;
 233     }
 234
 235     return 0;
 236 }
 237
 238 static void* start_player(void *data) {
 239     MainWindow *win = data;
 240
 241     Player *player = malloc(sizeof(Player));
 242     memset(player, 0, sizeof(Player));
 243
 244     // start mpv
 245     if(start_player_process(player, win)) {
 246         PlayerDestroy(player);
 247         return NULL;
 248     }
 249
 250     // wait until IPC socket is ready
 251     if(wait_for_ipc(player)) {
 252         PlayerDestroy(player);
 253         return NULL;
 254     }
 255     close(player->log);
 256
 257     if(connect_to_ipc(player)) {
 258         PlayerDestroy(player);
 259         return NULL;
 260     }
 261
 262     // set player in main window
 263     if(win->player) {
 264         PlayerDestroy(win->player);
 265     }
 266     win->player = player;
 267
 268     // IO
 269     player_io(player);
 270
 271     return NULL;
 272 }
 273
 274 static void player_io(Player *p) {
 275     struct pollfd fds[2];
 276     fds[0].fd = p->ipc;
 277     fds[0].events = POLLIN;
 278     fds[0].revents = 0;
 279     JSONParser *js = json_parser_new();
 280
 281     char buf[PLAYER_IN_BUFSIZE];
 282     while(p->isactive && poll(fds, 2, PLAYER_POLL_TIMEOUT)) {
 283         if(fds[0].revents == POLLIN) {
 284             ssize_t r;
 285             if((r = read(fds[0].fd, buf, PLAYER_IN_BUFSIZE)) <= 0) {
 286                 break;
 287             }
 288             //fwrite(buf, 1, r, stdout);
 289             fflush(stdout);
 290             json_parser_fill(js, buf, r);
 291
 292             JSONValue *value;
 293             int ret;
 294             while((ret = json_read_value(js, &value)) == 1) {
 295                 handle_json_rpc_msg(p, value);
 296                 json_value_free(value);
 297             }
 298
 299             if(ret == -1) {
 300                 fprintf(stderr, "JSON-RPC error\n");
 301                 break;
 302             }
 303         }
 304
 305         char *cmd = "{ \"command\": [\"get_property\", \"playback-time\"], request_id=\"" REQ_ID_PLAYBACK_TIME "\" }\n";
 306         //write(p->ipc, cmd, strlen(cmd));
 307     }
 308
 309
 310     printf("PlayerEnd: %s\n", strerror(errno));
 311     fflush(stdout);
 312 }
 313
 314
 315 static void handle_json_rpc_msg(Player *player, JSONValue *v) {
 316     if(v->type != JSON_OBJECT) return;
 317
 318     JSONValue *request_id_v = json_obj_get(&v->value.object, "request_id");
 319     JSONValue *event = NULL;
 320     if(request_id_v && request_id_v->type == JSON_STRING) {
 321         int request_id = 0;
 322         if(request_id_v->value.string.length == 2) {
 323             request_id = 10 * (request_id_v->value.string.string[0] - '0') + (request_id_v->value.string.string[1] - '0');
 324             handle_json_rpc_reqid(player, v, request_id);
 325             return;
 326         }
 327     } else if ((event = json_obj_get(&v->value.object, "event")) != NULL) {
 328         handle_json_rpc_event(player, v, event);
 329     }
 330
 331     //json_print(v, NULL, 0);
 332     fflush(stdout);
 333 }
 334
 335 static Boolean player_widget_set_size(XtPointer data) {
 336     Player *player = data;
 337     MainWindow *win = GetMainWindow();
 338
 339     Dimension win_width, win_height;
 340     XtVaGetValues(win->window, XmNwidth, &win_width, XmNheight, &win_height, NULL);
 341     Dimension player_width, player_height;
 342     XtVaGetValues(win->player_widget, XmNwidth, &player_width, XmNheight, &player_height, NULL);
 343
 344     Dimension new_width = player->width + win_width - player_width;
 345     Dimension new_height = player->height + win_height - player_height;
 346
 347     // set window size
 348     XtVaSetValues(win->window, XmNwidth, new_width, XmNheight, new_height, NULL);
 349
 350     // set window aspect ratio
 351     XSizeHints hints;
 352     hints.flags = PAspect;
 353     hints.min_aspect.x = new_width;
 354     hints.min_aspect.y = new_height;
 355     hints.max_aspect.x = new_width;
 356     hints.max_aspect.y = new_height;
 357     XSetWMNormalHints(XtDisplay(win->window), XtWindow(win->window), &hints);
 358
 359     return 0;
 360 }
 361
 362
 363
 364 static void player_set_size(Player *player, int width, int height) {
 365     if(width >= 0) {
 366         player->width = width;
 367     }
 368     if(height >= 0) {
 369         player->height = height;
 370     }
 371     if(player->width > 0 && player->height > 0) {
 372         AppExecProc(player_widget_set_size, player);
 373     }
 374 }
 375
 376 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid) {
 377     JSONValue *data = json_obj_get(&v->value.object, "data");
 378     if(!data) return;
 379
 380     switch(reqid) {
 381         case REQ_ID_PLAYBACK_TIME_INT: {
 382             if(data->type == JSON_NUMBER) {
 383                 player->playback_time = data->value.number.value;
 384             }
 385             break;
 386         }
 387         case REQ_ID_WIDTH_INT: {
 388             if(data->type == JSON_INTEGER) {
 389                 player_set_size(player, data->value.integer.value, -1);
 390             }
 391             break;
 392         }
 393         case REQ_ID_HEIGHT_INT: {
 394             if(data->type == JSON_INTEGER) {
 395                 player_set_size(player, -1, data->value.integer.value);
 396             }
 397             break;
 398         }
 399     }
 400 }
 401
 402 static Boolean get_player_window(XtPointer data) {
 403     Player *p = data;
 404     MainWindow *win = GetMainWindow();
 405
 406     Widget player_wid = win->player_widget;
 407     Window root, parent;
 408     Window *child;
 409     unsigned int nchild;
 410     XQueryTree(XtDisplay(player_wid), XtWindow(player_wid), &root, &parent, &child, &nchild);
 411     if(nchild > 0) {
 412         p->window = child[0];
 413         XFree(child);
 414     }
 415
 416     return 0;
 417 }
 418
 419 static void handle_json_rpc_event(Player *p, JSONValue *v, JSONValue *event) {
 420     if(!json_strcmp(event, "property-change")) {
 421         JSONValue *name = json_obj_get(&v->value.object, "name");
 422         JSONValue *data = json_obj_get(&v->value.object, "data");
 423         if(!json_strcmp(name, "eof-reached")) {
 424             if(data && data->type == JSON_LITERAL && data->value.literal.literal == JSON_TRUE) {
 425                 PlayerEOF(p);
 426             }
 427         }
 428     } else if(!p->isstarted && !json_strcmp(event, "playback-restart")) {
 429         char *cmd = "{ \"command\": [\"observe_property\", 1, \"playback-time\"] }\n"
 430                     "{ \"command\": [\"observe_property\", 1, \"eof-reached\"] }\n"
 431                     "{ \"command\": [\"get_property\", \"width\"], request_id=\"" REQ_ID_WIDTH "\" }\n"
 432                     "{ \"command\": [\"get_property\", \"height\"], request_id=\"" REQ_ID_HEIGHT "\" }\n"
 433                     "{ \"command\": [\"set_property\", \"keep-open\", true] }\n";
 434         write(p->ipc, cmd, strlen(cmd));
 435         p->isstarted = TRUE;
 436
 437         AppExecProc(get_player_window, p);
 438     }
 439 }
 440
 441 void PlayerDestroy(Player *p) {
 442     if(p->log >= 0) {
 443         close(p->log);
 444     }
 445     if(p->ipc >= 0) {
 446         close(p->ipc);
 447     }
 448
 449     if(p->tmp) {
 450         free(p->tmp);
 451     }
 452
 453     if(p->isactive) {
 454         kill(p->process, SIGTERM);
 455     }
 456
 457     free(p);
 458 }
 459
 460
 461 static void json_print(JSONValue *value, char *name, int indent) {
 462     if(name) {
 463         printf("%*s%s: ", indent*4, "", name);
 464     } else {
 465         printf("%*s", indent*4, "");
 466     }
 467
 468
 469     switch(value->type) {
 470         case JSON_OBJECT: {
 471             printf("{\n");
 472
 473             for(int i=0;i<value->value.object.size;i++) {
 474                 JSONObjValue val = value->value.object.values[i];
 475                 json_print(val.value, val.name, indent+1);
 476                 if(i+1 < value->value.object.size) {
 477                     printf(",\n");
 478                 } else {
 479                     printf("\n");
 480                 }
 481             }
 482
 483             printf("%*s}", indent*4, "");
 484             break;
 485         }
 486         case JSON_ARRAY: {
 487             printf("[\n");
 488
 489             for(int i=0;i<value->value.object.size;i++) {
 490                 JSONValue *v = value->value.array.array[i];
 491                 json_print(v, NULL, indent+1);
 492                 if(i+1 < value->value.array.size) {
 493                     printf(",\n");
 494                 } else {
 495                     printf("\n");
 496                 }
 497             }
 498
 499             printf("%*s]", indent*4, "");
 500             break;
 501         }
 502         case JSON_STRING: {
 503             printf("\"%s\"", value->value.string.string);
 504             break;
 505         }
 506         case JSON_INTEGER: {
 507             printf("%i", (int)value->value.integer.value);
 508             break;
 509         }
 510         case JSON_NUMBER: {
 511             printf("%f", value->value.number.value);
 512             break;
 513         }
 514         case JSON_LITERAL: {
 515             char *lit = "NULL";
 516             switch(value->value.literal.literal) {
 517                 case JSON_NULL: break;
 518                 case JSON_TRUE: lit = "true"; break;
 519                 case JSON_FALSE: lit = "false"; break;
 520             }
 521             printf("%s\n", lit);
 522             break;
 523         }
 524     }
 525
 526     if(indent == 0) {
 527         putchar('\n');
 528     }
 529 }
 530
 531 void PlayerEOF(Player *p) {
 532     char *cmd = "{ \"command\": [\"set_property\", \"playback-time\", 0] }\n";
 533     write(p->ipc, cmd, strlen(cmd));
 534 }
 535
 536 void PlayerHandleInput(MainWindow *win, Player *p, XmDrawingAreaCallbackStruct *cb) {
 537
 538 }