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
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/fcntl.h>
  29 #include <spawn.h>
  30 #include <sys/wait.h>
  31 #include <signal.h>
  32 #include <poll.h>
  33 #include <fcntl.h>
  34 #include <sys/stat.h>
  35 #include <errno.h>
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38 #include <pthread.h>
  39
  40 #include "json.h"
  41
  42 extern char **environ;
  43
  44 #define STR_BUFSIZE 512
  45 #define WID_ARG_BUFSIZE 24
  46
  47 #define PLAYER_POLL_TIMEOUT 500
  48 #define PLAYER_IN_BUFSIZE   8192
  49
  50 static void json_print(JSONValue *value, char *name, int indent);
  51
  52 static void* start_player(void *data);
  53
  54 static void player_io(Player *p);
  55
  56 static void handle_json_rpc_msg(Player *player, JSONValue *v);
  57 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid);
  58 static void handle_json_rpc_event(Player *player, JSONValue *v, JSONValue *event);
  59
  60 void PlayerOpenFile(MainWindow *win) {
  61     pthread_t tid;
  62     if(pthread_create(&tid, NULL, start_player, win)) {
  63         perror("pthread_create");
  64     }
  65 }
  66
  67 static int prepare_player(Player *player, char *log_arg, char *ipc_arg) {
  68     // create tmp directory for IPC
  69     char *player_tmp = NULL;
  70     char buf[STR_BUFSIZE];
  71     snprintf(buf, STR_BUFSIZE, "/tmp/uwplayer-%x", rand());
  72     int mkdir_success = 0;
  73     for(int t=0;t<5;t++) {
  74         if(!mkdir(buf, S_IRWXU)) {
  75             mkdir_success = 1;
  76             break;
  77         } else if(errno != EEXIST) {
  78             break;
  79         }
  80     }
  81     if(!mkdir_success) return 1;
  82     player_tmp = strdup(buf);
  83     player->tmp = player_tmp;
  84
  85     // prepare log/ipc args and create log fifo
  86     int err = 0;
  87
  88     if(snprintf(log_arg, STR_BUFSIZE, "--log-file=%s/%s", player_tmp, "log.fifo") >= STR_BUFSIZE) {
  89         err = 1;
  90     }
  91     if(snprintf(ipc_arg, STR_BUFSIZE, "--input-ipc-server=%s/%s", player_tmp, "ipc.socket") >= STR_BUFSIZE) {
  92         err = 1;
  93     }
  94
  95     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player_tmp);
  96     if(err || mkfifo(buf, S_IRUSR|S_IWUSR)) {
  97         rmdir(player_tmp);
  98         return 1;
  99     }
 100
 101     return 0;
 102 }
 103
 104 static void* wait_for_process(void *data) {
 105     Player *player = data;
 106     int status = 0;
 107     waitpid(player->process, &status, 0);
 108
 109     player->isactive = FALSE;
 110     player->status = status;
 111
 112     return NULL;
 113 }
 114
 115 static int start_player_process(Player *player, MainWindow *win) {
 116     char log_arg[STR_BUFSIZE];
 117     char ipc_arg[STR_BUFSIZE];
 118
 119     if(prepare_player(player, log_arg, ipc_arg)) {
 120         return 1;
 121     }
 122
 123     char *player_bin = "/usr/local/bin/mpv"; // TODO: get bin from settings
 124
 125     // -wid parameter value for embedding the player in the player_widget
 126     Window wid = XtWindow(win->player_widget);
 127     char wid_arg[WID_ARG_BUFSIZE];
 128     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
 129         return 1;
 130     }
 131
 132     // create player arg list
 133     char *args[32];
 134     args[0] = player_bin;
 135     args[1] = "-wid";
 136     args[2] = wid_arg;
 137     args[3] = "--no-terminal";
 138     args[4] = log_arg;
 139     args[5] = ipc_arg;
 140     args[6] = win->file;
 141     args[7] = NULL;
 142
 143     posix_spawn_file_actions_t actions;
 144     posix_spawn_file_actions_init(&actions);
 145
 146     //posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
 147     //posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
 148
 149     // start player
 150     pid_t player_pid;
 151     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
 152         perror("posix_spawn");
 153         return 1;
 154     }
 155     posix_spawn_file_actions_destroy(&actions);
 156
 157     player->process = player_pid;
 158     player->isactive = TRUE;
 159
 160     pthread_t tid;
 161     if(pthread_create(&tid, NULL, wait_for_process, player)) {
 162         perror("pthread_create");
 163     }
 164
 165     return 0;
 166 }
 167
 168 static int wait_for_ipc(Player *player) {
 169     char buf[STR_BUFSIZE];
 170     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player->tmp); // cannot fail
 171
 172     // open log
 173     int fd_log = open(buf, O_RDONLY);
 174     if(fd_log < 0) {
 175         perror("Cannot open log");
 176         return 1;
 177     }
 178     player->log = fd_log;
 179
 180     // read log until IPC socket is created
 181     char *scan_str = "Listening to IPC";
 182     int scan_pos = 0;
 183     int scan_len = strlen(scan_str);
 184     int ipc_listen = 0;
 185     ssize_t r;
 186     while((r = read(fd_log, buf, STR_BUFSIZE)) > 0) {
 187         for(int i=0;i<r;i++) {
 188             char c = buf[i];
 189             char *s_str = buf+i;
 190
 191             if(scan_pos == scan_len) {
 192                 ipc_listen = 1;
 193                 break;
 194             }
 195
 196             if(scan_str[scan_pos] == c) {
 197                 scan_pos++;
 198             } else {
 199                 scan_pos = 0;
 200             }
 201         }
 202         if(ipc_listen) break;
 203     }
 204
 205     return 0;
 206 }
 207
 208 static int connect_to_ipc(Player *player) {
 209     // connect to IPC socket
 210     int fd_ipc = socket(AF_UNIX, SOCK_STREAM, 0);
 211     if(fd_ipc < 0) {
 212         perror("Cannot create IPC socket");
 213         return 1;
 214     }
 215     player->ipc = fd_ipc;
 216
 217     char buf[STR_BUFSIZE];
 218     snprintf(buf, STR_BUFSIZE, "%s/%s", player->tmp, "ipc.socket"); // cannot fail
 219
 220     struct sockaddr_un ipc_addr;
 221     memset(&ipc_addr, 0, sizeof(struct sockaddr_un));
 222     ipc_addr.sun_family = AF_UNIX;
 223     memcpy(ipc_addr.sun_path, buf, strlen(buf));
 224     if(connect(fd_ipc, (struct sockaddr *)&ipc_addr, sizeof(ipc_addr)) == -1) {
 225         perror("Cannot connect to IPC socket");
 226         return 1;
 227     }
 228
 229     return 0;
 230 }
 231
 232 static void* start_player(void *data) {
 233     MainWindow *win = data;
 234
 235     Player *player = malloc(sizeof(Player));
 236     memset(player, 0, sizeof(Player));
 237
 238     // start mpv
 239     if(start_player_process(player, win)) {
 240         PlayerDestroy(player);
 241         return NULL;
 242     }
 243
 244     // wait until IPC socket is ready
 245     if(wait_for_ipc(player)) {
 246         PlayerDestroy(player);
 247         return NULL;
 248     }
 249
 250     if(connect_to_ipc(player)) {
 251         PlayerDestroy(player);
 252         return NULL;
 253     }
 254
 255     // set player in main window
 256     if(win->player) {
 257         PlayerDestroy(win->player);
 258     }
 259     win->player = player;
 260
 261     // IO
 262     player_io(player);
 263
 264     return NULL;
 265 }
 266
 267 static void player_io(Player *p) {
 268     int flags = fcntl(p->log, F_GETFL, 0);
 269     fcntl(p->log, F_SETFL, flags | O_NONBLOCK);
 270
 271     struct pollfd fds[2];
 272     fds[0].fd = p->log;
 273     fds[0].events = POLLIN;
 274     fds[0].revents = 0;
 275     fds[1].fd = p->ipc;
 276     fds[1].events = POLLIN;
 277     fds[1].revents = 0;
 278
 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             // clean up fifo
 285             read(fds[0].fd, buf, PLAYER_IN_BUFSIZE);
 286         }
 287
 288         if(fds[1].revents == POLLIN) {
 289             ssize_t r;
 290             if((r = read(fds[1].fd, buf, PLAYER_IN_BUFSIZE)) <= 0) {
 291                 break;
 292             }
 293             //fwrite(buf, 1, r, stdout);
 294             fflush(stdout);
 295             json_parser_fill(js, buf, r);
 296
 297             JSONValue *value;
 298             int ret;
 299             while((ret = json_read_value(js, &value)) == 1) {
 300                 handle_json_rpc_msg(p, value);
 301                 json_value_free(value);
 302             }
 303
 304             if(ret == -1) {
 305                 fprintf(stderr, "JSON-RPC error\n");
 306                 break;
 307             }
 308         }
 309
 310         char *cmd = "{ \"command\": [\"get_property\", \"playback-time\"], request_id=\"" REQ_ID_PLAYBACK_TIME "\" }\n";
 311         //write(p->ipc, cmd, strlen(cmd));
 312     }
 313
 314     printf("PlayerEnd\n");
 315     fflush(stdout);
 316 }
 317
 318
 319 static void handle_json_rpc_msg(Player *player, JSONValue *v) {
 320     if(v->type != JSON_OBJECT) return;
 321
 322     JSONValue *request_id_v = json_obj_get(&v->value.object, "request_id");
 323     JSONValue *event = NULL;
 324     if(request_id_v && request_id_v->type == JSON_STRING) {
 325         int request_id = 0;
 326         if(request_id_v->value.string.length == 2) {
 327             request_id = 10 * (request_id_v->value.string.string[0] - '0') + (request_id_v->value.string.string[1] - '0');
 328             handle_json_rpc_reqid(player, v, request_id);
 329             return;
 330         }
 331     } else if ((event = json_obj_get(&v->value.object, "event")) != NULL) {
 332         handle_json_rpc_event(player, v, event);
 333     }
 334
 335     json_print(v, NULL, 0);
 336     fflush(stdout);
 337 }
 338
 339 static void player_set_size(Player *player, int width, int height) {
 340     if(width >= 0) {
 341         player->width = width;
 342     }
 343     if(height >= 0) {
 344         player->height = height;
 345     }
 346     if(player->width > 0 && player->height > 0) {
 347         printf("TODO: set player size\n");
 348     }
 349 }
 350
 351 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid) {
 352     JSONValue *data = json_obj_get(&v->value.object, "data");
 353     if(!data) return;
 354
 355     switch(reqid) {
 356         case REQ_ID_PLAYBACK_TIME_INT: {
 357             if(data->type == JSON_NUMBER) {
 358                 player->playback_time = data->value.number.value;
 359             }
 360             break;
 361         }
 362         case REQ_ID_WIDTH_INT: {
 363             if(data->type == JSON_INTEGER) {
 364                 player_set_size(player, data->value.integer.value, -1);
 365             }
 366             break;
 367         }
 368         case REQ_ID_HEIGHT_INT: {
 369             if(data->type == JSON_INTEGER) {
 370                 player_set_size(player, -1, data->value.integer.value);
 371             }
 372             break;
 373         }
 374     }
 375 }
 376
 377 static void handle_json_rpc_event(Player *p, JSONValue *v, JSONValue *event) {
 378     if(!json_strcmp(event, "property-change")) {
 379         printf("property change\n");
 380     } else if(!json_strcmp(event, "playback-restart")) {
 381         char *cmd = "{ \"command\": [\"observe_property\", 1, \"playback-time\"] }\n"
 382                     "{ \"command\": [\"get_property\", \"width\"], request_id=\"" REQ_ID_WIDTH "\" }\n"
 383                     "{ \"command\": [\"get_property\", \"height\"], request_id=\"" REQ_ID_HEIGHT "\" }\n";
 384         write(p->ipc, cmd, strlen(cmd));
 385     } else if(!json_strcmp(event, "end-file")) {
 386         JSONValue *reason = json_obj_get(&v->value.object, "reason");
 387         if(reason && !json_strcmp(reason, "eof")) {
 388             PlayerEOF(p);
 389         }
 390     }
 391 }
 392
 393 void PlayerDestroy(Player *p) {
 394     if(p->log >= 0) {
 395         close(p->log);
 396     }
 397     if(p->ipc >= 0) {
 398         close(p->ipc);
 399     }
 400
 401     if(p->tmp) {
 402         free(p->tmp);
 403     }
 404
 405     if(p->isactive) {
 406         kill(p->process, SIGTERM);
 407     }
 408
 409     free(p);
 410 }
 411
 412
 413 static void json_print(JSONValue *value, char *name, int indent) {
 414     if(name) {
 415         printf("%*s%s: ", indent*4, "", name);
 416     } else {
 417         printf("%*s", indent*4, "");
 418     }
 419
 420
 421     switch(value->type) {
 422         case JSON_OBJECT: {
 423             printf("{\n");
 424
 425             for(int i=0;i<value->value.object.size;i++) {
 426                 JSONObjValue val = value->value.object.values[i];
 427                 json_print(val.value, val.name, indent+1);
 428                 if(i+1 < value->value.object.size) {
 429                     printf(",\n");
 430                 } else {
 431                     printf("\n");
 432                 }
 433             }
 434
 435             printf("%*s}", indent*4, "");
 436             break;
 437         }
 438         case JSON_ARRAY: {
 439             printf("[\n");
 440
 441             for(int i=0;i<value->value.object.size;i++) {
 442                 JSONValue *v = value->value.array.array[i];
 443                 json_print(v, NULL, indent+1);
 444                 if(i+1 < value->value.array.size) {
 445                     printf(",\n");
 446                 } else {
 447                     printf("\n");
 448                 }
 449             }
 450
 451             printf("%*s]", indent*4, "");
 452             break;
 453         }
 454         case JSON_STRING: {
 455             printf("\"%s\"", value->value.string.string);
 456             break;
 457         }
 458         case JSON_INTEGER: {
 459             printf("%i", (int)value->value.integer.value);
 460             break;
 461         }
 462         case JSON_NUMBER: {
 463             printf("%f", value->value.number.value);
 464             break;
 465         }
 466         case JSON_LITERAL: {
 467             printf("%s\n", "literal\n");
 468             break;
 469         }
 470     }
 471
 472     if(indent == 0) {
 473         putchar('\n');
 474     }
 475 }
 476
 477 void PlayerEOF(Player *p) {
 478     char *cmd = "{ \"command\": [\"set_property\", \"pause\"], true }\n";
 479     //write(p->ipc, cmd, strlen(cmd));
 480 }