/* * Copyright (C) 2003-2009 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "output_control.h" #include "output_api.h" #include "output_internal.h" #include "output_thread.h" #include "mixer_control.h" #include "mixer_plugin.h" #include "filter_plugin.h" #include "notify.h" #include <assert.h> #include <stdlib.h> enum { /** after a failure, wait this number of seconds before automatically reopening the device */ REOPEN_AFTER = 10, }; struct notify audio_output_client_notify; static void ao_command_wait(struct audio_output *ao) { while (ao->command != AO_COMMAND_NONE) { g_mutex_unlock(ao->mutex); notify_wait(&audio_output_client_notify); g_mutex_lock(ao->mutex); } } static void ao_command(struct audio_output *ao, enum audio_output_command cmd) { assert(ao->command == AO_COMMAND_NONE); ao->command = cmd; g_cond_signal(ao->cond); ao_command_wait(ao); } static void ao_command_async(struct audio_output *ao, enum audio_output_command cmd) { assert(ao->command == AO_COMMAND_NONE); ao->command = cmd; g_cond_signal(ao->cond); } void audio_output_enable(struct audio_output *ao) { if (ao->thread == NULL) { if (ao->plugin->enable == NULL) { /* don't bother to start the thread now if the device doesn't even have a enable() method; just assign the variable and we're done */ ao->really_enabled = true; return; } audio_output_thread_start(ao); } g_mutex_lock(ao->mutex); ao_command(ao, AO_COMMAND_ENABLE); g_mutex_unlock(ao->mutex); } void audio_output_disable(struct audio_output *ao) { if (ao->thread == NULL) { if (ao->plugin->disable == NULL) ao->really_enabled = false; else /* if there's no thread yet, the device cannot be enabled */ assert(!ao->really_enabled); return; } g_mutex_lock(ao->mutex); ao_command(ao, AO_COMMAND_DISABLE); g_mutex_unlock(ao->mutex); } static bool audio_output_open(struct audio_output *ao, const struct audio_format *audio_format, const struct music_pipe *mp) { bool open; assert(mp != NULL); if (ao->fail_timer != NULL) { g_timer_destroy(ao->fail_timer); ao->fail_timer = NULL; } if (ao->open && audio_format_equals(audio_format, &ao->in_audio_format)) { assert(ao->pipe == mp); if (ao->pause) { /* unpause with the CANCEL command; this is a hack, but suits well for forcing the thread to leave the ao_pause() thread, and we need to flush the device buffer anyway */ /* we're not using audio_output_cancel() here, because that function is asynchronous */ ao_command(ao, AO_COMMAND_CANCEL); /* the audio output is now waiting for a signal; wake it up immediately */ g_cond_signal(ao->cond); } return true; } ao->in_audio_format = *audio_format; ao->chunk = NULL; ao->pipe = mp; if (ao->thread == NULL) audio_output_thread_start(ao); ao_command(ao, ao->open ? AO_COMMAND_REOPEN : AO_COMMAND_OPEN); open = ao->open; if (open && ao->mixer != NULL) { GError *error = NULL; if (!mixer_open(ao->mixer, &error)) { g_warning("Failed to open mixer for '%s': %s", ao->name, error->message); g_error_free(error); } } return open; } /** * Same as audio_output_close(), but expects the lock to be held by * the caller. */ static void audio_output_close_locked(struct audio_output *ao) { if (ao->mixer != NULL) mixer_auto_close(ao->mixer); assert(!ao->open || ao->fail_timer == NULL); if (ao->open) ao_command(ao, AO_COMMAND_CLOSE); else if (ao->fail_timer != NULL) { g_timer_destroy(ao->fail_timer); ao->fail_timer = NULL; } } bool audio_output_update(struct audio_output *ao, const struct audio_format *audio_format, const struct music_pipe *mp) { assert(mp != NULL); g_mutex_lock(ao->mutex); if (ao->enabled && ao->really_enabled) { if (ao->fail_timer == NULL || g_timer_elapsed(ao->fail_timer, NULL) > REOPEN_AFTER) { bool success = audio_output_open(ao, audio_format, mp); g_mutex_unlock(ao->mutex); return success; } } else if (audio_output_is_open(ao)) audio_output_close_locked(ao); g_mutex_unlock(ao->mutex); return false; } void audio_output_play(struct audio_output *ao) { g_mutex_lock(ao->mutex); if (audio_output_is_open(ao)) g_cond_signal(ao->cond); g_mutex_unlock(ao->mutex); } void audio_output_pause(struct audio_output *ao) { if (ao->mixer != NULL && ao->plugin->pause == NULL) /* the device has no pause mode: close the mixer, unless its "global" flag is set (checked by mixer_auto_close()) */ mixer_auto_close(ao->mixer); g_mutex_lock(ao->mutex); if (audio_output_is_open(ao)) ao_command_async(ao, AO_COMMAND_PAUSE); g_mutex_unlock(ao->mutex); } void audio_output_drain_async(struct audio_output *ao) { g_mutex_lock(ao->mutex); if (audio_output_is_open(ao)) ao_command_async(ao, AO_COMMAND_DRAIN); g_mutex_unlock(ao->mutex); } void audio_output_cancel(struct audio_output *ao) { g_mutex_lock(ao->mutex); if (audio_output_is_open(ao)) ao_command_async(ao, AO_COMMAND_CANCEL); g_mutex_unlock(ao->mutex); } void audio_output_close(struct audio_output *ao) { if (ao->mixer != NULL) mixer_auto_close(ao->mixer); g_mutex_lock(ao->mutex); assert(!ao->open || ao->fail_timer == NULL); if (ao->open) ao_command(ao, AO_COMMAND_CLOSE); else if (ao->fail_timer != NULL) { g_timer_destroy(ao->fail_timer); ao->fail_timer = NULL; } g_mutex_unlock(ao->mutex); } void audio_output_finish(struct audio_output *ao) { audio_output_close(ao); assert(ao->fail_timer == NULL); if (ao->thread != NULL) { g_mutex_lock(ao->mutex); ao_command(ao, AO_COMMAND_KILL); g_mutex_unlock(ao->mutex); g_thread_join(ao->thread); } if (ao->mixer != NULL) mixer_free(ao->mixer); ao_plugin_finish(ao->plugin, ao->data); g_cond_free(ao->cond); g_mutex_free(ao->mutex); filter_free(ao->filter); }