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 int start_player_process(Player *player, MainWindow *win) {
 105     char log_arg[STR_BUFSIZE];
 106     char ipc_arg[STR_BUFSIZE];
 107
 108     if(prepare_player(player, log_arg, ipc_arg)) {
 109         return 1;
 110     }
 111
 112     char *player_bin = "/usr/local/bin/mpv"; // TODO: get bin from settings
 113
 114     // -wid parameter value for embedding the player in the player_widget
 115     Window wid = XtWindow(win->player_widget);
 116     char wid_arg[WID_ARG_BUFSIZE];
 117     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
 118         return 1;
 119     }
 120
 121     // create player arg list
 122     char *args[32];
 123     args[0] = player_bin;
 124     args[1] = "-wid";
 125     args[2] = wid_arg;
 126     args[3] = "--no-terminal";
 127     args[4] = log_arg;
 128     args[5] = ipc_arg;
 129     args[6] = win->file;
 130     args[7] = NULL;
 131
 132     posix_spawn_file_actions_t actions;
 133     posix_spawn_file_actions_init(&actions);
 134
 135     //posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
 136     //posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
 137
 138     // start player
 139     pid_t player_pid;
 140     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
 141         perror("posix_spawn");
 142         return 1;
 143     }
 144     posix_spawn_file_actions_destroy(&actions);
 145
 146     player->process = player_pid;
 147     player->isactive = TRUE;
 148
 149     return 0;
 150 }
 151
 152 static int wait_for_ipc(Player *player) {
 153     char buf[STR_BUFSIZE];
 154     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player->tmp); // cannot fail
 155
 156     // open log
 157     int fd_log = open(buf, O_RDONLY);
 158     if(fd_log < 0) {
 159         perror("Cannot open log");
 160         return 1;
 161     }
 162     player->log = fd_log;
 163
 164     // read log until IPC socket is created
 165     char *scan_str = "Listening to IPC";
 166     int scan_pos = 0;
 167     int scan_len = strlen(scan_str);
 168     int ipc_listen = 0;
 169     ssize_t r;
 170     while((r = read(fd_log, buf, STR_BUFSIZE)) > 0) {
 171         for(int i=0;i<r;i++) {
 172             char c = buf[i];
 173             char *s_str = buf+i;
 174
 175             if(scan_pos == scan_len) {
 176                 ipc_listen = 1;
 177                 break;
 178             }
 179
 180             if(scan_str[scan_pos] == c) {
 181                 scan_pos++;
 182             } else {
 183                 scan_pos = 0;
 184             }
 185         }
 186         if(ipc_listen) break;
 187     }
 188
 189     return 0;
 190 }
 191
 192 static int connect_to_ipc(Player *player) {
 193     // connect to IPC socket
 194     int fd_ipc = socket(AF_UNIX, SOCK_STREAM, 0);
 195     if(fd_ipc < 0) {
 196         perror("Cannot create IPC socket");
 197         return 1;
 198     }
 199     player->ipc = fd_ipc;
 200
 201     char buf[STR_BUFSIZE];
 202     snprintf(buf, STR_BUFSIZE, "%s/%s", player->tmp, "ipc.socket"); // cannot fail
 203
 204     struct sockaddr_un ipc_addr;
 205     memset(&ipc_addr, 0, sizeof(struct sockaddr_un));
 206     ipc_addr.sun_family = AF_UNIX;
 207     memcpy(ipc_addr.sun_path, buf, strlen(buf));
 208     if(connect(fd_ipc, (struct sockaddr *)&ipc_addr, sizeof(ipc_addr)) == -1) {
 209         perror("Cannot connect to IPC socket");
 210         return 1;
 211     }
 212
 213     return 0;
 214 }
 215
 216 static void* start_player(void *data) {
 217     MainWindow *win = data;
 218
 219     Player *player = malloc(sizeof(Player));
 220     memset(player, 0, sizeof(Player));
 221
 222     // start mpv
 223     if(start_player_process(player, win)) {
 224         PlayerDestroy(player);
 225         return NULL;
 226     }
 227
 228     // wait until IPC socket is ready
 229     if(wait_for_ipc(player)) {
 230         PlayerDestroy(player);
 231         return NULL;
 232     }
 233
 234     if(connect_to_ipc(player)) {
 235         PlayerDestroy(player);
 236         return NULL;
 237     }
 238
 239     // set player in main window
 240     if(win->player) {
 241         PlayerDestroy(win->player);
 242     }
 243     win->player = player;
 244
 245     // IO
 246     player_io(player);
 247
 248     return NULL;
 249 }
 250
 251 static void player_io(Player *p) {
 252     int flags = fcntl(p->log, F_GETFL, 0);
 253     fcntl(p->log, F_SETFL, flags | O_NONBLOCK);
 254
 255     struct pollfd fds[2];
 256     fds[0].fd = p->log;
 257     fds[0].events = POLLIN;
 258     fds[0].revents = 0;
 259     fds[1].fd = p->ipc;
 260     fds[1].events = POLLIN;
 261     fds[1].revents = 0;
 262
 263     JSONParser *js = json_parser_new();
 264
 265     char buf[PLAYER_IN_BUFSIZE];
 266     while(poll(fds, 2, PLAYER_POLL_TIMEOUT)) {
 267         if(fds[0].revents == POLLIN) {
 268             // clean up fifo
 269             read(fds[0].fd, buf, PLAYER_IN_BUFSIZE);
 270         }
 271
 272         if(fds[1].revents == POLLIN) {
 273             ssize_t r;
 274             if((r = read(fds[1].fd, buf, PLAYER_IN_BUFSIZE)) <= 0) {
 275                 break;
 276             }
 277             //fwrite(buf, 1, r, stdout);
 278             fflush(stdout);
 279             json_parser_fill(js, buf, r);
 280
 281             JSONValue *value;
 282             int ret;
 283             while((ret = json_read_value(js, &value)) == 1) {
 284                 handle_json_rpc_msg(p, value);
 285                 json_value_free(value);
 286             }
 287
 288             if(ret == -1) {
 289                 fprintf(stderr, "JSON-RPC error\n");
 290                 break;
 291             }
 292         }
 293
 294         char *cmd = "{ \"command\": [\"get_property\", \"playback-time\"], request_id=\"" REQ_ID_PLAYBACK_TIME "\" }\n";
 295         //write(p->ipc, cmd, strlen(cmd));
 296     }
 297 }
 298
 299
 300 static void handle_json_rpc_msg(Player *player, JSONValue *v) {
 301     if(v->type != JSON_OBJECT) return;
 302
 303     JSONValue *request_id_v = json_obj_get(&v->value.object, "request_id");
 304     JSONValue *event = NULL;
 305     if(request_id_v && request_id_v->type == JSON_STRING) {
 306         int request_id = 0;
 307         if(request_id_v->value.string.length == 2) {
 308             request_id = 10 * (request_id_v->value.string.string[0] - '0') + (request_id_v->value.string.string[1] - '0');
 309             handle_json_rpc_reqid(player, v, request_id);
 310             return;
 311         }
 312     } else if ((event = json_obj_get(&v->value.object, "event")) != NULL) {
 313         handle_json_rpc_event(player, v, event);
 314     }
 315
 316     json_print(v, NULL, 0);
 317     fflush(stdout);
 318 }
 319
 320 static void player_set_size(Player *player, int width, int height) {
 321     if(width >= 0) {
 322         player->width = width;
 323     }
 324     if(height >= 0) {
 325         player->height = height;
 326     }
 327     if(player->width > 0 && player->height > 0) {
 328         printf("TODO: set player size\n");
 329     }
 330 }
 331
 332 static void handle_json_rpc_reqid(Player *player, JSONValue *v, int reqid) {
 333     JSONValue *data = json_obj_get(&v->value.object, "data");
 334     if(!data) return;
 335
 336     switch(reqid) {
 337         case REQ_ID_PLAYBACK_TIME_INT: {
 338             if(data->type == JSON_NUMBER) {
 339                 player->playback_time = data->value.number.value;
 340             }
 341             break;
 342         }
 343         case REQ_ID_WIDTH_INT: {
 344             if(data->type == JSON_INTEGER) {
 345                 player_set_size(player, data->value.integer.value, -1);
 346             }
 347             break;
 348         }
 349         case REQ_ID_HEIGHT_INT: {
 350             if(data->type == JSON_INTEGER) {
 351                 player_set_size(player, -1, data->value.integer.value);
 352             }
 353             break;
 354         }
 355     }
 356 }
 357
 358 static void handle_json_rpc_event(Player *p, JSONValue *v, JSONValue *event) {
 359     if(!json_strcmp(event, "property-change")) {
 360         printf("property change\n");
 361     } else if(!json_strcmp(event, "playback-restart")) {
 362         char *cmd = "{ \"command\": [\"observe_property\", 1, \"playback-time\"] }\n"
 363                     "{ \"command\": [\"get_property\", \"width\"], request_id=\"" REQ_ID_WIDTH "\" }\n"
 364                     "{ \"command\": [\"get_property\", \"height\"], request_id=\"" REQ_ID_HEIGHT "\" }\n";
 365         write(p->ipc, cmd, strlen(cmd));
 366     }
 367 }
 368
 369 void PlayerDestroy(Player *p) {
 370     if(p->log >= 0) {
 371         close(p->log);
 372     }
 373     if(p->ipc >= 0) {
 374         close(p->ipc);
 375     }
 376
 377     if(p->tmp) {
 378         free(p->tmp);
 379     }
 380
 381     if(p->isactive) {
 382         kill(p->process, SIGTERM);
 383     }
 384
 385     free(p);
 386 }
 387
 388
 389 static void json_print(JSONValue *value, char *name, int indent) {
 390     if(name) {
 391         printf("%*s%s: ", indent*4, "", name);
 392     } else {
 393         printf("%*s", indent*4, "");
 394     }
 395
 396
 397     switch(value->type) {
 398         case JSON_OBJECT: {
 399             printf("{\n");
 400
 401             for(int i=0;i<value->value.object.size;i++) {
 402                 JSONObjValue val = value->value.object.values[i];
 403                 json_print(val.value, val.name, indent+1);
 404                 if(i+1 < value->value.object.size) {
 405                     printf(",\n");
 406                 } else {
 407                     printf("\n");
 408                 }
 409             }
 410
 411             printf("%*s}", indent*4, "");
 412             break;
 413         }
 414         case JSON_ARRAY: {
 415             printf("[\n");
 416
 417             for(int i=0;i<value->value.object.size;i++) {
 418                 JSONValue *v = value->value.array.array[i];
 419                 json_print(v, NULL, indent+1);
 420                 if(i+1 < value->value.array.size) {
 421                     printf(",\n");
 422                 } else {
 423                     printf("\n");
 424                 }
 425             }
 426
 427             printf("%*s]", indent*4, "");
 428             break;
 429         }
 430         case JSON_STRING: {
 431             printf("\"%s\"", value->value.string.string);
 432             break;
 433         }
 434         case JSON_INTEGER: {
 435             printf("%i", (int)value->value.integer.value);
 436             break;
 437         }
 438         case JSON_NUMBER: {
 439             printf("%f", value->value.number.value);
 440             break;
 441         }
 442         case JSON_LITERAL: {
 443             printf("%s\n", "literal\n");
 444             break;
 445         }
 446     }
 447
 448     if(indent == 0) {
 449         putchar('\n');
 450     }
 451 }
 452