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 void PlayerOpenFile(MainWindow *win) {
  57     pthread_t tid;
  58     if(pthread_create(&tid, NULL, start_player, win)) {
  59         perror("pthread_create");
  60     }
  61 }
  62
  63 static int prepare_player(Player *player, char *log_arg, char *ipc_arg) {
  64     // create tmp directory for IPC
  65     char *player_tmp = NULL;
  66     char buf[STR_BUFSIZE];
  67     snprintf(buf, STR_BUFSIZE, "/tmp/uwplayer-%x", rand());
  68     int mkdir_success = 0;
  69     for(int t=0;t<5;t++) {
  70         if(!mkdir(buf, S_IRWXU)) {
  71             mkdir_success = 1;
  72             break;
  73         } else if(errno != EEXIST) {
  74             break;
  75         }
  76     }
  77     if(!mkdir_success) return 1;
  78     player_tmp = strdup(buf);
  79     player->tmp = player_tmp;
  80
  81     // prepare log/ipc args and create log fifo
  82     int err = 0;
  83
  84     if(snprintf(log_arg, STR_BUFSIZE, "--log-file=%s/%s", player_tmp, "log.fifo") >= STR_BUFSIZE) {
  85         err = 1;
  86     }
  87     if(snprintf(ipc_arg, STR_BUFSIZE, "--input-ipc-server=%s/%s", player_tmp, "ipc.socket") >= STR_BUFSIZE) {
  88         err = 1;
  89     }
  90
  91     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player_tmp);
  92     if(err || mkfifo(buf, S_IRUSR|S_IWUSR)) {
  93         rmdir(player_tmp);
  94         return 1;
  95     }
  96
  97     return 0;
  98 }
  99
 100 static int start_player_process(Player *player, MainWindow *win) {
 101     char log_arg[STR_BUFSIZE];
 102     char ipc_arg[STR_BUFSIZE];
 103
 104     if(prepare_player(player, log_arg, ipc_arg)) {
 105         return 1;
 106     }
 107
 108     char *player_bin = "/usr/local/bin/mpv"; // TODO: get bin from settings
 109
 110     // -wid parameter value for embedding the player in the player_widget
 111     Window wid = XtWindow(win->player_widget);
 112     char wid_arg[WID_ARG_BUFSIZE];
 113     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
 114         return 1;
 115     }
 116
 117     // create player arg list
 118     char *args[32];
 119     args[0] = player_bin;
 120     args[1] = "-wid";
 121     args[2] = wid_arg;
 122     args[3] = "--no-terminal";
 123     args[4] = log_arg;
 124     args[5] = ipc_arg;
 125     args[6] = win->file;
 126     args[7] = NULL;
 127
 128     posix_spawn_file_actions_t actions;
 129     posix_spawn_file_actions_init(&actions);
 130
 131     //posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
 132     //posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
 133
 134     // start player
 135     pid_t player_pid;
 136     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
 137         perror("posix_spawn");
 138         return 1;
 139     }
 140     posix_spawn_file_actions_destroy(&actions);
 141
 142     player->process = player_pid;
 143     player->isactive = TRUE;
 144
 145     return 0;
 146 }
 147
 148 static int wait_for_ipc(Player *player) {
 149     char buf[STR_BUFSIZE];
 150     snprintf(buf, STR_BUFSIZE, "%s/log.fifo", player->tmp); // cannot fail
 151
 152     // open log
 153     int fd_log = open(buf, O_RDONLY);
 154     if(fd_log < 0) {
 155         perror("Cannot open log");
 156         return 1;
 157     }
 158     player->log = fd_log;
 159
 160     // read log until IPC socket is created
 161     char *scan_str = "Listening to IPC";
 162     int scan_pos = 0;
 163     int scan_len = strlen(scan_str);
 164     int ipc_listen = 0;
 165     ssize_t r;
 166     while((r = read(fd_log, buf, STR_BUFSIZE)) > 0) {
 167         for(int i=0;i<r;i++) {
 168             char c = buf[i];
 169             char *s_str = buf+i;
 170
 171             if(scan_pos == scan_len) {
 172                 ipc_listen = 1;
 173                 break;
 174             }
 175
 176             if(scan_str[scan_pos] == c) {
 177                 scan_pos++;
 178             } else {
 179                 scan_pos = 0;
 180             }
 181         }
 182         if(ipc_listen) break;
 183     }
 184
 185     return 0;
 186 }
 187
 188 static int connect_to_ipc(Player *player) {
 189     // connect to IPC socket
 190     int fd_ipc = socket(AF_UNIX, SOCK_STREAM, 0);
 191     if(fd_ipc < 0) {
 192         perror("Cannot create IPC socket");
 193         return 1;
 194     }
 195     player->ipc = fd_ipc;
 196
 197     char buf[STR_BUFSIZE];
 198     snprintf(buf, STR_BUFSIZE, "%s/%s", player->tmp, "ipc.socket"); // cannot fail
 199
 200     struct sockaddr_un ipc_addr;
 201     memset(&ipc_addr, 0, sizeof(struct sockaddr_un));
 202     ipc_addr.sun_family = AF_UNIX;
 203     memcpy(ipc_addr.sun_path, buf, strlen(buf));
 204     if(connect(fd_ipc, (struct sockaddr *)&ipc_addr, sizeof(ipc_addr)) == -1) {
 205         perror("Cannot connect to IPC socket");
 206         return 1;
 207     }
 208
 209     return 0;
 210 }
 211
 212 static void* start_player(void *data) {
 213     MainWindow *win = data;
 214
 215     Player *player = malloc(sizeof(Player));
 216     memset(player, 0, sizeof(Player));
 217
 218     // start mpv
 219     if(start_player_process(player, win)) {
 220         PlayerDestroy(player);
 221         return NULL;
 222     }
 223
 224     // wait until IPC socket is ready
 225     if(wait_for_ipc(player)) {
 226         PlayerDestroy(player);
 227         return NULL;
 228     }
 229
 230     if(connect_to_ipc(player)) {
 231         PlayerDestroy(player);
 232         return NULL;
 233     }
 234
 235     // set player in main window
 236     if(win->player) {
 237         PlayerDestroy(win->player);
 238     }
 239     win->player = player;
 240
 241     // IO
 242     player_io(player);
 243
 244     return NULL;
 245 }
 246
 247 static void player_io(Player *p) {
 248     int flags = fcntl(p->log, F_GETFL, 0);
 249     fcntl(p->log, F_SETFL, flags | O_NONBLOCK);
 250
 251     struct pollfd fds[2];
 252     fds[0].fd = p->log;
 253     fds[0].events = POLLIN;
 254     fds[0].revents = 0;
 255     fds[1].fd = p->ipc;
 256     fds[1].events = POLLIN;
 257     fds[1].revents = 0;
 258
 259     JSONParser *js = json_parser_new();
 260
 261     char buf[PLAYER_IN_BUFSIZE];
 262     while(poll(fds, 2, PLAYER_POLL_TIMEOUT)) {
 263         if(fds[0].revents == POLLIN) {
 264             // clean up fifo
 265             read(fds[0].fd, buf, PLAYER_IN_BUFSIZE);
 266         }
 267
 268         if(fds[1].revents == POLLIN) {
 269             ssize_t r;
 270             if((r = read(fds[1].fd, buf, PLAYER_IN_BUFSIZE)) <= 0) {
 271                 break;
 272             }
 273             json_parser_fill(js, buf, r);
 274
 275             JSONValue *value;
 276             int ret;
 277             while((ret = json_read_value(js, &value)) == 1) {
 278                 json_print(value, NULL, 0);
 279                 json_value_free(value);
 280             }
 281
 282             if(ret == -1) {
 283                 fprintf(stderr, "JSON-RPC error\n");
 284                 break;
 285             }
 286         }
 287
 288         char *cmd = "{ \"command\": [\"get_property\", \"playback-time\"], request_id=\"" REQ_ID_PLAYBACK_TIME "\" }\n";
 289         write(p->ipc, cmd, strlen(cmd));
 290     }
 291 }
 292
 293 void PlayerDestroy(Player *p) {
 294     if(p->log >= 0) {
 295         close(p->log);
 296     }
 297     if(p->ipc >= 0) {
 298         close(p->ipc);
 299     }
 300
 301     if(p->tmp) {
 302         free(p->tmp);
 303     }
 304
 305     if(p->isactive) {
 306         kill(p->process, SIGTERM);
 307     }
 308
 309     free(p);
 310 }
 311
 312
 313 static void json_print(JSONValue *value, char *name, int indent) {
 314     if(name) {
 315         printf("%*s%s: ", indent*4, "", name);
 316     } else {
 317         printf("%*s", indent*4, "");
 318     }
 319
 320
 321     switch(value->type) {
 322         case JSON_OBJECT: {
 323             printf("{\n");
 324
 325             for(int i=0;i<value->value.object.size;i++) {
 326                 JSONObjValue val = value->value.object.values[i];
 327                 json_print(val.value, val.name, indent+1);
 328                 if(i+1 < value->value.object.size) {
 329                     printf(",\n");
 330                 } else {
 331                     printf("\n");
 332                 }
 333             }
 334
 335             printf("%*s}", indent*4, "");
 336             break;
 337         }
 338         case JSON_ARRAY: {
 339             printf("[\n");
 340
 341             for(int i=0;i<value->value.object.size;i++) {
 342                 JSONValue *v = value->value.array.array[i];
 343                 json_print(v, NULL, indent+1);
 344                 if(i+1 < value->value.array.size) {
 345                     printf(",\n");
 346                 } else {
 347                     printf("\n");
 348                 }
 349             }
 350
 351             printf("%*s]", indent*4, "");
 352             break;
 353         }
 354         case JSON_STRING: {
 355             printf("\"%s\"", value->value.string.string);
 356             break;
 357         }
 358         case JSON_INTEGER: {
 359             printf("%i", (int)value->value.integer.value);
 360             break;
 361         }
 362         case JSON_NUMBER: {
 363             printf("%f", value->value.number.value);
 364             break;
 365         }
 366         case JSON_LITERAL: {
 367             printf("%s\n", "literal\n");
 368             break;
 369         }
 370     }
 371
 372     if(indent == 0) {
 373         putchar('\n');
 374     }
 375 }
 376