1 #ifndef foohooklistfoo 2 #define foohooklistfoo 3 4 /*** 5 This file is part of PulseAudio. 6 7 Copyright 2006 Lennart Poettering 8 9 PulseAudio is free software; you can redistribute it and/or modify 10 it under the terms of the GNU Lesser General Public License as 11 published by the Free Software Foundation; either version 2.1 of the 12 License, or (at your option) any later version. 13 14 PulseAudio is distributed in the hope that it will be useful, but 15 WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 General Public License for more details. 18 19 You should have received a copy of the GNU Lesser General Public 20 License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. 21 ***/ 22 23 #include <pulsecore/llist.h> 24 25 typedef struct pa_hook_slot pa_hook_slot; 26 typedef struct pa_hook pa_hook; 27 28 typedef enum pa_hook_result { 29 PA_HOOK_OK = 0, 30 PA_HOOK_STOP = 1, 31 PA_HOOK_CANCEL = -1 32 } pa_hook_result_t; 33 34 typedef enum pa_hook_priority { 35 PA_HOOK_EARLY = -100, 36 PA_HOOK_NORMAL = 0, 37 PA_HOOK_LATE = 100 38 } pa_hook_priority_t; 39 40 typedef pa_hook_result_t (*pa_hook_cb_t)( 41 void *hook_data, 42 void *call_data, 43 void *slot_data); 44 45 struct pa_hook_slot { 46 bool dead; 47 pa_hook *hook; 48 pa_hook_priority_t priority; 49 pa_hook_cb_t callback; 50 void *data; 51 PA_LLIST_FIELDS(pa_hook_slot); 52 }; 53 54 struct pa_hook { 55 PA_LLIST_HEAD(pa_hook_slot, slots); 56 int n_firing, n_dead; 57 58 void *data; 59 }; 60 61 void pa_hook_init(pa_hook *hook, void *data); 62 void pa_hook_done(pa_hook *hook); 63 64 pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data); 65 void pa_hook_slot_free(pa_hook_slot *slot); 66 67 pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data); 68 69 bool pa_hook_is_firing(pa_hook *hook); 70 71 #endif 72