From bb0366e8d2f92136fad3403ca758834cc8ceeb6a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C5=99emysl=20Janouch?= Date: Sat, 6 Jan 2018 03:54:12 +0100 Subject: Add paswitch: PulseAudio output switcher Initial commit. It does what it's supposed to but it's very buggy. --- poller-pa.c | 361 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 361 insertions(+) create mode 100644 poller-pa.c (limited to 'poller-pa.c') diff --git a/poller-pa.c b/poller-pa.c new file mode 100644 index 0000000..08b5ac0 --- /dev/null +++ b/poller-pa.c @@ -0,0 +1,361 @@ +/* + * pa.c: PulseAudio mainloop abstraction + * + * Copyright (c) 2016 - 2017, Přemysl Janouch + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#include + +// --- PulseAudio mainloop abstraction ----------------------------------------- + +struct pa_io_event +{ + LIST_HEADER (pa_io_event) + + pa_mainloop_api *api; ///< Parent structure + struct poller_fd fd; ///< Underlying FD event + + pa_io_event_cb_t dispatch; ///< Dispatcher + pa_io_event_destroy_cb_t free; ///< Destroyer + void *user_data; ///< User data +}; + +struct pa_time_event +{ + LIST_HEADER (pa_time_event) + + pa_mainloop_api *api; ///< Parent structure + struct poller_timer timer; ///< Underlying timer event + + pa_time_event_cb_t dispatch; ///< Dispatcher + pa_time_event_destroy_cb_t free; ///< Destroyer + void *user_data; ///< User data +}; + +struct pa_defer_event +{ + LIST_HEADER (pa_defer_event) + + pa_mainloop_api *api; ///< Parent structure + struct poller_idle idle; ///< Underlying idle event + + pa_defer_event_cb_t dispatch; ///< Dispatcher + pa_defer_event_destroy_cb_t free; ///< Destroyer + void *user_data; ///< User data +}; + +struct poller_pa +{ + struct poller *poller; ///< The underlying event loop + int result; ///< Result on quit + bool running; ///< Not quitting + + pa_io_event *io_list; ///< I/O events + pa_time_event *time_list; ///< Timer events + pa_defer_event *defer_list; ///< Deferred events +}; + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static short +poller_pa_flags_to_events (pa_io_event_flags_t flags) +{ + short result = 0; + if (flags & PA_IO_EVENT_ERROR) result |= POLLERR; + if (flags & PA_IO_EVENT_HANGUP) result |= POLLHUP; + if (flags & PA_IO_EVENT_INPUT) result |= POLLIN; + if (flags & PA_IO_EVENT_OUTPUT) result |= POLLOUT; + return result; +} + +static pa_io_event_flags_t +poller_pa_events_to_flags (short events) +{ + pa_io_event_flags_t result = 0; + if (events & POLLERR) result |= PA_IO_EVENT_ERROR; + if (events & POLLHUP) result |= PA_IO_EVENT_HANGUP; + if (events & POLLIN) result |= PA_IO_EVENT_INPUT; + if (events & POLLOUT) result |= PA_IO_EVENT_OUTPUT; + return result; +} + +static struct timeval +poller_pa_get_current_time (void) +{ + struct timeval tv; +#ifdef _POSIX_TIMERS + struct timespec tp; + hard_assert (clock_gettime (CLOCK_REALTIME, &tp) != -1); + tv.tv_sec = tp.tv_sec; + tv.tv_usec = tp.tv_nsec / 1000; +#else + gettimeofday (&tv, NULL); +#endif + return tv; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static void +poller_pa_io_dispatcher (const struct pollfd *pfd, void *user_data) +{ + pa_io_event *self = user_data; + self->dispatch (self->api, self, + pfd->fd, poller_pa_events_to_flags (pfd->revents), self->user_data); +} + +static void +poller_pa_io_enable (pa_io_event *self, pa_io_event_flags_t events) +{ + struct poller_fd *fd = &self->fd; + if (events) + poller_fd_set (fd, poller_pa_flags_to_events (events)); + else + poller_fd_reset (fd); +} + +static pa_io_event * +poller_pa_io_new (pa_mainloop_api *api, int fd_, pa_io_event_flags_t events, + pa_io_event_cb_t cb, void *userdata) +{ + pa_io_event *self = xcalloc (1, sizeof *self); + self->api = api; + self->dispatch = cb; + self->user_data = userdata; + + struct poller_pa *data = api->userdata; + self->fd = poller_fd_make (data->poller, fd_); + self->fd.user_data = self; + self->fd.dispatcher = poller_pa_io_dispatcher; + + // FIXME: under x2go PA tries to register twice for the same FD, + // which fails with our curent poller implementation; + // we could maintain a list of { poller_fd, listeners } structures; + // or maybe we're doing something wrong, which is yet to be determined + poller_pa_io_enable (self, events); + LIST_PREPEND (data->io_list, self); + return self; +} + +static void +poller_pa_io_free (pa_io_event *self) +{ + if (self->free) + self->free (self->api, self, self->user_data); + + struct poller_pa *data = self->api->userdata; + poller_fd_reset (&self->fd); + LIST_UNLINK (data->io_list, self); + free (self); +} + +static void +poller_pa_io_set_destroy (pa_io_event *self, pa_io_event_destroy_cb_t cb) +{ + self->free = cb; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static void +poller_pa_time_dispatcher (void *user_data) +{ + pa_time_event *self = user_data; + // XXX: the meaning of the time argument is undocumented, + // so let's just put current Unix time in there + struct timeval now = poller_pa_get_current_time (); + self->dispatch (self->api, self, &now, self->user_data); +} + +static void +poller_pa_time_restart (pa_time_event *self, const struct timeval *tv) +{ + struct poller_timer *timer = &self->timer; + if (tv) + { + struct timeval now = poller_pa_get_current_time (); + poller_timer_set (timer, + (tv->tv_sec - now.tv_sec) * 1000 + + (tv->tv_usec - now.tv_usec) / 1000); + } + else + poller_timer_reset (timer); +} + +static pa_time_event * +poller_pa_time_new (pa_mainloop_api *api, const struct timeval *tv, + pa_time_event_cb_t cb, void *userdata) +{ + pa_time_event *self = xcalloc (1, sizeof *self); + self->api = api; + self->dispatch = cb; + self->user_data = userdata; + + struct poller_pa *data = api->userdata; + self->timer = poller_timer_make (data->poller); + self->timer.user_data = self; + self->timer.dispatcher = poller_pa_time_dispatcher; + + poller_pa_time_restart (self, tv); + LIST_PREPEND (data->time_list, self); + return self; +} + +static void +poller_pa_time_free (pa_time_event *self) +{ + if (self->free) + self->free (self->api, self, self->user_data); + + struct poller_pa *data = self->api->userdata; + poller_timer_reset (&self->timer); + LIST_UNLINK (data->time_list, self); + free (self); +} + +static void +poller_pa_time_set_destroy (pa_time_event *self, pa_time_event_destroy_cb_t cb) +{ + self->free = cb; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static void +poller_pa_defer_dispatcher (void *user_data) +{ + pa_defer_event *self = user_data; + self->dispatch (self->api, self, self->user_data); +} + +static pa_defer_event * +poller_pa_defer_new (pa_mainloop_api *api, + pa_defer_event_cb_t cb, void *userdata) +{ + pa_defer_event *self = xcalloc (1, sizeof *self); + self->api = api; + self->dispatch = cb; + self->user_data = userdata; + + struct poller_pa *data = api->userdata; + self->idle = poller_idle_make (data->poller); + self->idle.user_data = self; + self->idle.dispatcher = poller_pa_defer_dispatcher; + + poller_idle_set (&self->idle); + LIST_PREPEND (data->defer_list, self); + return self; +} + +static void +poller_pa_defer_enable (pa_defer_event *self, int enable) +{ + struct poller_idle *idle = &self->idle; + if (enable) + poller_idle_set (idle); + else + poller_idle_reset (idle); +} + +static void +poller_pa_defer_free (pa_defer_event *self) +{ + if (self->free) + self->free (self->api, self, self->user_data); + + struct poller_pa *data = self->api->userdata; + poller_idle_reset (&self->idle); + LIST_UNLINK (data->defer_list, self); + free (self); +} + +static void +poller_pa_defer_set_destroy (pa_defer_event *self, + pa_defer_event_destroy_cb_t cb) +{ + self->free = cb; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static void +poller_pa_quit (pa_mainloop_api *api, int retval) +{ + struct poller_pa *data = api->userdata; + data->result = retval; + data->running = false; +} + +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + +static struct pa_mainloop_api g_poller_pa_template = +{ + .io_new = poller_pa_io_new, + .io_enable = poller_pa_io_enable, + .io_free = poller_pa_io_free, + .io_set_destroy = poller_pa_io_set_destroy, + + .time_new = poller_pa_time_new, + .time_restart = poller_pa_time_restart, + .time_free = poller_pa_time_free, + .time_set_destroy = poller_pa_time_set_destroy, + + .defer_new = poller_pa_defer_new, + .defer_enable = poller_pa_defer_enable, + .defer_free = poller_pa_defer_free, + .defer_set_destroy = poller_pa_defer_set_destroy, + + .quit = poller_pa_quit, +}; + +static struct pa_mainloop_api * +poller_pa_new (struct poller *self) +{ + struct poller_pa *data = xcalloc (1, sizeof *data); + data->poller = self; + + struct pa_mainloop_api *api = xmalloc (sizeof *api); + *api = g_poller_pa_template; + api->userdata = data; + return api; +} + +static void +poller_pa_destroy (struct pa_mainloop_api *api) +{ + struct poller_pa *data = api->userdata; + + LIST_FOR_EACH (pa_io_event, iter, data->io_list) + poller_pa_io_free (iter); + LIST_FOR_EACH (pa_time_event, iter, data->time_list) + poller_pa_time_free (iter); + LIST_FOR_EACH (pa_defer_event, iter, data->defer_list) + poller_pa_defer_free (iter); + + free (data); + free (api); +} + +/// Since our poller API doesn't care much about continuous operation, +/// we need to provide that in the PulseAudio abstraction itself +static int +poller_pa_run (struct pa_mainloop_api *api) +{ + struct poller_pa *data = api->userdata; + data->running = true; + while (data->running) + poller_run (data->poller); + return data->result; +} -- cgit v1.2.3