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Diffstat (limited to '')
-rw-r--r-- | src/OutputControl.cxx | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/src/OutputControl.cxx b/src/OutputControl.cxx new file mode 100644 index 000000000..37565082e --- /dev/null +++ b/src/OutputControl.cxx @@ -0,0 +1,349 @@ +/* + * Copyright (C) 2003-2013 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 "config.h" +#include "OutputControl.hxx" +#include "OutputThread.hxx" +#include "output_api.h" + +extern "C" { +#include "output_internal.h" +#include "mixer_control.h" +#include "mixer_plugin.h" +} + +#include "notify.hxx" +#include "filter/ReplayGainFilterPlugin.hxx" +#include "FilterPlugin.hxx" + +#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; + +/** + * Waits for command completion. + * + * @param ao the #audio_output instance; must be locked + */ +static void ao_command_wait(struct audio_output *ao) +{ + while (ao->command != AO_COMMAND_NONE) { + g_mutex_unlock(ao->mutex); + audio_output_client_notify.Wait(); + g_mutex_lock(ao->mutex); + } +} + +/** + * Sends a command to the #audio_output object, but does not wait for + * completion. + * + * @param ao the #audio_output instance; must be locked + */ +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); +} + +/** + * Sends a command to the #audio_output object and waits for + * completion. + * + * @param ao the #audio_output instance; must be locked + */ +static void +ao_command(struct audio_output *ao, enum audio_output_command cmd) +{ + ao_command_async(ao, cmd); + ao_command_wait(ao); +} + +/** + * Lock the #audio_output object and execute the command + * synchronously. + */ +static void +ao_lock_command(struct audio_output *ao, enum audio_output_command cmd) +{ + g_mutex_lock(ao->mutex); + ao_command(ao, cmd); + g_mutex_unlock(ao->mutex); +} + +void +audio_output_set_replay_gain_mode(struct audio_output *ao, + enum replay_gain_mode mode) +{ + if (ao->replay_gain_filter != NULL) + replay_gain_filter_set_mode(ao->replay_gain_filter, mode); +} + +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); + } + + ao_lock_command(ao, AO_COMMAND_ENABLE); +} + +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; + } + + ao_lock_command(ao, AO_COMMAND_DISABLE); +} + +/** + * Object must be locked (and unlocked) by the caller. + */ +static bool +audio_output_open(struct audio_output *ao, + const struct audio_format *audio_format, + const struct music_pipe *mp) +{ + bool open; + + assert(ao != NULL); + assert(ao->allow_play); + assert(audio_format_valid(audio_format)); + 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 || + (ao->always_on && ao->pause)); + + if (ao->pause) { + ao->chunk = NULL; + ao->pipe = mp; + + /* 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); + } + + 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) +{ + assert(ao != NULL); + assert(ao->allow_play); + + 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); + + assert(ao->allow_play); + + 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); + assert(ao->allow_play); + 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); + assert(ao->allow_play); + 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->allow_play = false; + ao_command_async(ao, AO_COMMAND_CANCEL); + } + + g_mutex_unlock(ao->mutex); +} + +void +audio_output_allow_play(struct audio_output *ao) +{ + g_mutex_lock(ao->mutex); + + ao->allow_play = true; + if (audio_output_is_open(ao)) + g_cond_signal(ao->cond); + + g_mutex_unlock(ao->mutex); +} + +void +audio_output_release(struct audio_output *ao) +{ + if (ao->always_on) + audio_output_pause(ao); + else + audio_output_close(ao); +} + +void audio_output_close(struct audio_output *ao) +{ + assert(ao != NULL); + assert(!ao->open || ao->fail_timer == NULL); + + g_mutex_lock(ao->mutex); + audio_output_close_locked(ao); + 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) { + assert(ao->allow_play); + ao_lock_command(ao, AO_COMMAND_KILL); + g_thread_join(ao->thread); + ao->thread = NULL; + } + + audio_output_free(ao); +} |