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authorMax Kellermann <max@duempel.org>2013-01-04 09:46:41 +0100
committerMax Kellermann <max@duempel.org>2013-01-04 09:46:41 +0100
commitde0ab43bc12be345d85779e444266153ff5be007 (patch)
treece024a0c25c6fc75c65438b562b6300c06737a33 /src/OutputControl.cxx
parente12cc01aa4b25798a2887ac6c5e01309e744ea8b (diff)
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output_*: convert to C++
Diffstat (limited to 'src/OutputControl.cxx')
-rw-r--r--src/OutputControl.cxx340
1 files changed, 340 insertions, 0 deletions
diff --git a/src/OutputControl.cxx b/src/OutputControl.cxx
new file mode 100644
index 000000000..36e80a014
--- /dev/null
+++ b/src/OutputControl.cxx
@@ -0,0 +1,340 @@
+/*
+ * 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"
+
+extern "C" {
+#include "output_api.h"
+#include "output_internal.h"
+#include "mixer_control.h"
+#include "mixer_plugin.h"
+#include "notify.h"
+}
+
+#include "filter_plugin.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;
+
+/**
+ * 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);
+ notify_wait(&audio_output_client_notify);
+ 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_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);
+}