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
  32 #include <pthread.h>
  33
  34 extern char **environ;
  35
  36 #define WID_ARG_BUFSIZE 24
  37
  38 static void* start_player(void *data);
  39
  40 void PlayerOpenFile(MainWindow *win) {
  41     pthread_t tid;
  42     if(pthread_create(&tid, NULL, start_player, win)) {
  43         perror("pthread_create");
  44     }
  45 }
  46
  47 static void* start_player(void *data) {
  48     MainWindow *win = data;
  49
  50     char *player_bin = "/usr/local/bin/mpv"; // TODO: get bin from settings
  51
  52     // -wid parameter value for embedding the player in the player_widget
  53     Window wid = XtWindow(win->player_widget);
  54     char wid_arg[WID_ARG_BUFSIZE];
  55     if(snprintf(wid_arg, WID_ARG_BUFSIZE, "%lu", wid) >= WID_ARG_BUFSIZE) {
  56         return NULL;
  57     }
  58
  59     // create player arg list
  60     char *args[32];
  61     args[0] = player_bin;
  62     args[1] = "-wid";
  63     args[2] = wid_arg;
  64     args[3] = win->file;
  65     args[4] = NULL;
  66
  67     // redirect stdin/stdout
  68     int pout[2];
  69     int pin[2];
  70     if(pipe(pout)) {
  71         perror("pipe");
  72         return NULL;
  73     }
  74     if(pipe(pin)) {
  75         perror("pipe");
  76         return NULL;
  77     }
  78
  79     posix_spawn_file_actions_t actions;
  80     posix_spawn_file_actions_init(&actions);
  81
  82     posix_spawn_file_actions_adddup2(&actions, pin[0], STDIN_FILENO);
  83     posix_spawn_file_actions_adddup2(&actions, pout[1], STDOUT_FILENO);
  84
  85     // start player
  86     pid_t player_pid;
  87     if(posix_spawn(&player_pid, player_bin, &actions, NULL, args, environ)) {
  88         perror("posix_spawn");
  89         return NULL;
  90     }
  91     posix_spawn_file_actions_destroy(&actions);
  92
  93     Player *player = malloc(sizeof(Player));
  94     memset(player, 0, sizeof(Player));
  95
  96     player->in = pin[1];
  97     player->out = pout[0];
  98     close(pin[0]);
  99     close(pout[1]);
 100     player->process = player_pid;
 101
 102     if(win->player) {
 103         PlayerDestroy(win->player);
 104     }
 105     win->player = player;
 106
 107     return NULL;
 108 }
 109
 110 void PlayerDestroy(Player *p) {
 111     free(p);
 112 }