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
  43 extern char **environ;
  44
  45 #define STR_BUFSIZE 512
  46 #define WID_ARG_BUFSIZE 24
  47
  48 #define PLAYER_POLL_TIMEOUT 500
  49 #define PLAYER_IN_BUFSIZE   8192
  50
  51 static void json_print(JSONValue *value, char *name, int indent);
  52
  53 static void* start_player(void *data);
  54
  55 static void player_io(Player *p);
  56
  57 static void handle_json_rpc_msg(Player *player, JSONValue *v);
  58 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid);
  59 static void handle_json_rpc_event(Player *player, JSONValue *v, JSONValue *event);
  60
  61 void PlayerOpenFile(MainWindow *win) {
  62     pthread_t tid;
  63     if(pthread_create(&tid, NULL, start_player, win)) {
  64         perror("pthread_create");
  65     }
  66 }
  67
  68 static int prepare_player(Player *player, char *log_arg, char *ipc_arg) {
  69     // create tmp directory for IPC
  70     char *player_tmp = NULL;
  71     char buf[STR_BUFSIZE];
  72     snprintf(buf, STR_BUFSIZE, "/tmp/uwplayer-%x", rand());
  73     int mkdir_success = 0;
  74     for(int t=0;t<5;t++) {
  75         if(!mkdir(buf, S_IRWXU)) {
  76             mkdir_success = 1;
  77             break;
  78         } else if(errno != EEXIST) {
  79             break;
  80         }
  81     }
  82     if(!mkdir_success) return 1;
  83     player_tmp = strdup(buf);
  84     player->tmp = player_tmp;
  85
  86     // prepare log/ipc args and create log fifo
  87     int err = 0;
  88
  89     if(snprintf(log_arg, STR_BUFSIZE, "--log-file=%s/%s", player_tmp, "log.fifo") >= STR_BUFSIZE) {
  90         err = 1;
  91     }
  92     if(snprintf(ipc_arg, STR_BUFSIZE, "--input-ipc-server=%s/%s", player_tmp, "ipc.socket") >= STR_BUFSIZE) {
  93         err = 1;
  94     }
  95
  96     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player_tmp);
  97     if(err || mkfifo(buf, S_IRUSR|S_IWUSR)) {
  98         rmdir(player_tmp);
  99         return 1;
 100     }
 101
 102     return 0;
 103 }
 104
 105 static void* wait_for_process(void *data) {
 106     Player *player = data;
 107     int status = 0;
 108     waitpid(player->process, &status, 0);
 109
 110     player->isactive = FALSE;
 111     player->status = status;
 112
 113     return NULL;
 114 }
 115
 116 static int start_player_process(Player *player, MainWindow *win) {
 117     char log_arg[STR_BUFSIZE];
 118     char ipc_arg[STR_BUFSIZE];
 119
 120     if(prepare_player(player, log_arg, ipc_arg)) {
 121         return 1;
 122     }
 123
 124     char *player_bin = "/usr/local/bin/mpv"; // TODO: get bin from settings
 125
 126     // -wid parameter value for embedding the player in the player_widget
 127     Window wid = XtWindow(win->player_widget);
 128     char wid_arg[WID_ARG_BUFSIZE];
 129     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
 130         return 1;
 131     }
 132
 133     // create player arg list
 134     char *args[32];
 135     args[0] = player_bin;
 136     args[1] = "-wid";
 137     args[2] = wid_arg;
 138     args[3] = "--no-terminal";
 139     args[4] = log_arg;
 140     args[5] = ipc_arg;
 141     args[6] = win->file;
 142     args[7] = NULL;
 143
 144     posix_spawn_file_actions_t actions;
 145     posix_spawn_file_actions_init(&actions);
 146
 147     //posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
 148     //posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
 149
 150     // start player
 151     pid_t player_pid;
 152     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
 153         perror("posix_spawn");
 154         return 1;
 155     }
 156     posix_spawn_file_actions_destroy(&actions);
 157
 158     player->process = player_pid;
 159     player->isactive = TRUE;
 160
 161     pthread_t tid;
 162     if(pthread_create(&tid, NULL, wait_for_process, player)) {
 163         perror("pthread_create");
 164     }
 165
 166     return 0;
 167 }
 168
 169 static int wait_for_ipc(Player *player) {
 170     char buf[STR_BUFSIZE];
 171     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player->tmp); // cannot fail
 172
 173     // open log
 174     int fd_log = open(buf, O_RDONLY);
 175     if(fd_log < 0) {
 176         perror("Cannot open log");
 177         return 1;
 178     }
 179     player->log = fd_log;
 180
 181     // read log until IPC socket is created
 182     char *scan_str = "Listening to IPC";
 183     int scan_pos = 0;
 184     int scan_len = strlen(scan_str);
 185     int ipc_listen = 0;
 186     ssize_t r;
 187     while((r = read(fd_log, buf, STR_BUFSIZE)) > 0) {
 188         for(int i=0;i<r;i++) {
 189             char c = buf[i];
 190             char *s_str = buf+i;
 191
 192             if(scan_pos == scan_len) {
 193                 ipc_listen = 1;
 194                 break;
 195             }
 196
 197             if(scan_str[scan_pos] == c) {
 198                 scan_pos++;
 199             } else {
 200                 scan_pos = 0;
 201             }
 202         }
 203         if(ipc_listen) break;
 204     }
 205
 206     return 0;
 207 }
 208
 209 static int connect_to_ipc(Player *player) {
 210     // connect to IPC socket
 211     int fd_ipc = socket(AF_UNIX, SOCK_STREAM, 0);
 212     if(fd_ipc < 0) {
 213         perror("Cannot create IPC socket");
 214         return 1;
 215     }
 216     player->ipc = fd_ipc;
 217
 218     char buf[STR_BUFSIZE];
 219     snprintf(buf, STR_BUFSIZE, "%s/%s", player->tmp, "ipc.socket"); // cannot fail
 220
 221     struct sockaddr_un ipc_addr;
 222     memset(&ipc_addr, 0, sizeof(struct sockaddr_un));
 223     ipc_addr.sun_family = AF_UNIX;
 224     memcpy(ipc_addr.sun_path, buf, strlen(buf));
 225     if(connect(fd_ipc, (struct sockaddr *)&ipc_addr, sizeof(ipc_addr)) == -1) {
 226         perror("Cannot connect to IPC socket");
 227         return 1;
 228     }
 229
 230     return 0;
 231 }
 232
 233 static void* start_player(void *data) {
 234     MainWindow *win = data;
 235
 236     Player *player = malloc(sizeof(Player));
 237     memset(player, 0, sizeof(Player));
 238
 239     // start mpv
 240     if(start_player_process(player, win)) {
 241         PlayerDestroy(player);
 242         return NULL;
 243     }
 244
 245     // wait until IPC socket is ready
 246     if(wait_for_ipc(player)) {
 247         PlayerDestroy(player);
 248         return NULL;
 249     }
 250     close(player->log);
 251
 252     if(connect_to_ipc(player)) {
 253         PlayerDestroy(player);
 254         return NULL;
 255     }
 256
 257     // set player in main window
 258     if(win->player) {
 259         PlayerDestroy(win->player);
 260     }
 261     win->player = player;
 262
 263     // IO
 264     player_io(player);
 265
 266     return NULL;
 267 }
 268
 269 static void player_io(Player *p) {
 270     struct pollfd fds[2];
 271     fds[0].fd = p->ipc;
 272     fds[0].events = POLLIN;
 273     fds[0].revents = 0;
 274     JSONParser *js = json_parser_new();
 275
 276     char buf[PLAYER_IN_BUFSIZE];
 277     while(p->isactive && poll(fds, 2, PLAYER_POLL_TIMEOUT)) {
 278         if(fds[0].revents == POLLIN) {
 279             ssize_t r;
 280             if((r = read(fds[0].fd, buf, PLAYER_IN_BUFSIZE)) <= 0) {
 281                 break;
 282             }
 283             //fwrite(buf, 1, r, stdout);
 284             fflush(stdout);
 285             json_parser_fill(js, buf, r);
 286
 287             JSONValue *value;
 288             int ret;
 289             while((ret = json_read_value(js, &value)) == 1) {
 290                 handle_json_rpc_msg(p, value);
 291                 json_value_free(value);
 292             }
 293
 294             if(ret == -1) {
 295                 fprintf(stderr, "JSON-RPC error\n");
 296                 break;
 297             }
 298         }
 299
 300         char *cmd = "{ \"command\": [\"get_property\", \"playback-time\"], request_id=\"" REQ_ID_PLAYBACK_TIME "\" }\n";
 301         //write(p->ipc, cmd, strlen(cmd));
 302     }
 303
 304
 305     printf("PlayerEnd: %s\n", strerror(errno));
 306     fflush(stdout);
 307 }
 308
 309
 310 static void handle_json_rpc_msg(Player *player, JSONValue *v) {
 311     if(v->type != JSON_OBJECT) return;
 312
 313     JSONValue *request_id_v = json_obj_get(&v->value.object, "request_id");
 314     JSONValue *event = NULL;
 315     if(request_id_v && request_id_v->type == JSON_STRING) {
 316         int request_id = 0;
 317         if(request_id_v->value.string.length == 2) {
 318             request_id = 10 * (request_id_v->value.string.string[0] - '0') + (request_id_v->value.string.string[1] - '0');
 319             handle_json_rpc_reqid(player, v, request_id);
 320             return;
 321         }
 322     } else if ((event = json_obj_get(&v->value.object, "event")) != NULL) {
 323         handle_json_rpc_event(player, v, event);
 324     }
 325
 326     json_print(v, NULL, 0);
 327     fflush(stdout);
 328 }
 329
 330 static void player_widget_set_size(XtPointer data, XtIntervalId *id) {
 331     Player *player = data;
 332     MainWindow *win = GetMainWindow();
 333
 334     Dimension win_width, win_height;
 335     XtVaGetValues(win->window, XmNwidth, &win_width, XmNheight, &win_height, NULL);
 336     Dimension player_width, player_height;
 337     XtVaGetValues(win->player_widget, XmNwidth, &player_width, XmNheight, &player_height, NULL);
 338
 339     Dimension new_width = player->width + win_width - player_width;
 340     Dimension new_height = player->height + win_height - player_height;
 341
 342     XtVaSetValues(win->window, XmNwidth, new_width, XmNheight, new_height, NULL);
 343
 344 }
 345
 346
 347
 348 static void player_set_size(Player *player, int width, int height) {
 349     if(width >= 0) {
 350         player->width = width;
 351     }
 352     if(height >= 0) {
 353         player->height = height;
 354     }
 355     if(player->width > 0 && player->height > 0) {
 356         AppAddTimeOut(0, player_widget_set_size, player);
 357     }
 358 }
 359
 360 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid) {
 361     JSONValue *data = json_obj_get(&v->value.object, "data");
 362     if(!data) return;
 363
 364     switch(reqid) {
 365         case REQ_ID_PLAYBACK_TIME_INT: {
 366             if(data->type == JSON_NUMBER) {
 367                 player->playback_time = data->value.number.value;
 368             }
 369             break;
 370         }
 371         case REQ_ID_WIDTH_INT: {
 372             if(data->type == JSON_INTEGER) {
 373                 player_set_size(player, data->value.integer.value, -1);
 374             }
 375             break;
 376         }
 377         case REQ_ID_HEIGHT_INT: {
 378             if(data->type == JSON_INTEGER) {
 379                 player_set_size(player, -1, data->value.integer.value);
 380             }
 381             break;
 382         }
 383     }
 384 }
 385
 386 static void handle_json_rpc_event(Player *p, JSONValue *v, JSONValue *event) {
 387     if(!json_strcmp(event, "property-change")) {
 388         JSONValue *name = json_obj_get(&v->value.object, "name");
 389         JSONValue *data = json_obj_get(&v->value.object, "data");
 390         if(!json_strcmp(name, "eof-reached")) {
 391             if(data && data->type == JSON_LITERAL && data->value.literal.literal == JSON_TRUE) {
 392                 PlayerEOF(p);
 393             }
 394         }
 395     } else if(!json_strcmp(event, "playback-restart")) {
 396         char *cmd = "{ \"command\": [\"observe_property\", 1, \"playback-time\"] }\n"
 397                     "{ \"command\": [\"observe_property\", 1, \"eof-reached\"] }\n"
 398                     "{ \"command\": [\"get_property\", \"width\"], request_id=\"" REQ_ID_WIDTH "\" }\n"
 399                     "{ \"command\": [\"get_property\", \"height\"], request_id=\"" REQ_ID_HEIGHT "\" }\n"
 400                     "{ \"command\": [\"set_property\", \"keep-open\", true] }\n";
 401         write(p->ipc, cmd, strlen(cmd));
 402     }
 403 }
 404
 405 void PlayerDestroy(Player *p) {
 406     if(p->log >= 0) {
 407         close(p->log);
 408     }
 409     if(p->ipc >= 0) {
 410         close(p->ipc);
 411     }
 412
 413     if(p->tmp) {
 414         free(p->tmp);
 415     }
 416
 417     if(p->isactive) {
 418         kill(p->process, SIGTERM);
 419     }
 420
 421     free(p);
 422 }
 423
 424
 425 static void json_print(JSONValue *value, char *name, int indent) {
 426     if(name) {
 427         printf("%*s%s: ", indent*4, "", name);
 428     } else {
 429         printf("%*s", indent*4, "");
 430     }
 431
 432
 433     switch(value->type) {
 434         case JSON_OBJECT: {
 435             printf("{\n");
 436
 437             for(int i=0;i<value->value.object.size;i++) {
 438                 JSONObjValue val = value->value.object.values[i];
 439                 json_print(val.value, val.name, indent+1);
 440                 if(i+1 < value->value.object.size) {
 441                     printf(",\n");
 442                 } else {
 443                     printf("\n");
 444                 }
 445             }
 446
 447             printf("%*s}", indent*4, "");
 448             break;
 449         }
 450         case JSON_ARRAY: {
 451             printf("[\n");
 452
 453             for(int i=0;i<value->value.object.size;i++) {
 454                 JSONValue *v = value->value.array.array[i];
 455                 json_print(v, NULL, indent+1);
 456                 if(i+1 < value->value.array.size) {
 457                     printf(",\n");
 458                 } else {
 459                     printf("\n");
 460                 }
 461             }
 462
 463             printf("%*s]", indent*4, "");
 464             break;
 465         }
 466         case JSON_STRING: {
 467             printf("\"%s\"", value->value.string.string);
 468             break;
 469         }
 470         case JSON_INTEGER: {
 471             printf("%i", (int)value->value.integer.value);
 472             break;
 473         }
 474         case JSON_NUMBER: {
 475             printf("%f", value->value.number.value);
 476             break;
 477         }
 478         case JSON_LITERAL: {
 479             char *lit = "NULL";
 480             switch(value->value.literal.literal) {
 481                 case JSON_NULL: break;
 482                 case JSON_TRUE: lit = "true"; break;
 483                 case JSON_FALSE: lit = "false"; break;
 484             }
 485             printf("%s\n", lit);
 486             break;
 487         }
 488     }
 489
 490     if(indent == 0) {
 491         putchar('\n');
 492     }
 493 }
 494
 495 void PlayerEOF(Player *p) {
 496     char *cmd = "{ \"command\": [\"set_property\", \"playback-time\", 0] }\n";
 497     write(p->ipc, cmd, strlen(cmd));
 498 }