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-rw-r--r--src/output/OutputControl.cxx295
1 files changed, 295 insertions, 0 deletions
diff --git a/src/output/OutputControl.cxx b/src/output/OutputControl.cxx
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--- /dev/null
+++ b/src/output/OutputControl.cxx
@@ -0,0 +1,295 @@
+/*
+ * Copyright (C) 2003-2014 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 "Internal.hxx"
+#include "OutputPlugin.hxx"
+#include "Domain.hxx"
+#include "mixer/MixerControl.hxx"
+#include "notify.hxx"
+#include "filter/plugins/ReplayGainFilterPlugin.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+
+/** after a failure, wait this number of seconds before
+ automatically reopening the device */
+static constexpr unsigned REOPEN_AFTER = 10;
+
+struct notify audio_output_client_notify;
+
+void
+AudioOutput::WaitForCommand()
+{
+ while (!IsCommandFinished()) {
+ mutex.unlock();
+ audio_output_client_notify.Wait();
+ mutex.lock();
+ }
+}
+
+void
+AudioOutput::CommandAsync(audio_output_command cmd)
+{
+ assert(IsCommandFinished());
+
+ command = cmd;
+ cond.signal();
+}
+
+void
+AudioOutput::CommandWait(audio_output_command cmd)
+{
+ CommandAsync(cmd);
+ WaitForCommand();
+}
+
+void
+AudioOutput::LockCommandWait(audio_output_command cmd)
+{
+ const ScopeLock protect(mutex);
+ CommandWait(cmd);
+}
+
+void
+AudioOutput::SetReplayGainMode(ReplayGainMode mode)
+{
+ if (replay_gain_filter != nullptr)
+ replay_gain_filter_set_mode(replay_gain_filter, mode);
+ if (other_replay_gain_filter != nullptr)
+ replay_gain_filter_set_mode(other_replay_gain_filter, mode);
+}
+
+void
+AudioOutput::LockEnableWait()
+{
+ if (!thread.IsDefined()) {
+ if (plugin.enable == nullptr) {
+ /* 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 */
+ really_enabled = true;
+ return;
+ }
+
+ StartThread();
+ }
+
+ LockCommandWait(AO_COMMAND_ENABLE);
+}
+
+void
+AudioOutput::LockDisableWait()
+{
+ if (!thread.IsDefined()) {
+ if (plugin.disable == nullptr)
+ really_enabled = false;
+ else
+ /* if there's no thread yet, the device cannot
+ be enabled */
+ assert(!really_enabled);
+
+ return;
+ }
+
+ LockCommandWait(AO_COMMAND_DISABLE);
+}
+
+inline bool
+AudioOutput::Open(const AudioFormat audio_format, const MusicPipe &mp)
+{
+ assert(allow_play);
+ assert(audio_format.IsValid());
+
+ fail_timer.Reset();
+
+ if (open && audio_format == in_audio_format) {
+ assert(pipe == &mp || (always_on && pause));
+
+ if (pause) {
+ current_chunk = nullptr;
+ 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 */
+ CommandWait(AO_COMMAND_CANCEL);
+ }
+
+ return true;
+ }
+
+ in_audio_format = audio_format;
+ current_chunk = nullptr;
+
+ pipe = &mp;
+
+ if (!thread.IsDefined())
+ StartThread();
+
+ CommandWait(open ? AO_COMMAND_REOPEN : AO_COMMAND_OPEN);
+ const bool open2 = open;
+
+ if (open2 && mixer != nullptr) {
+ Error error;
+ if (!mixer_open(mixer, error))
+ FormatWarning(output_domain,
+ "Failed to open mixer for '%s'", name);
+ }
+
+ return open2;
+}
+
+void
+AudioOutput::CloseWait()
+{
+ assert(allow_play);
+
+ if (mixer != nullptr)
+ mixer_auto_close(mixer);
+
+ assert(!open || !fail_timer.IsDefined());
+
+ if (open)
+ CommandWait(AO_COMMAND_CLOSE);
+ else
+ fail_timer.Reset();
+}
+
+bool
+AudioOutput::LockUpdate(const AudioFormat audio_format,
+ const MusicPipe &mp)
+{
+ const ScopeLock protect(mutex);
+
+ if (enabled && really_enabled) {
+ if (fail_timer.Check(REOPEN_AFTER * 1000)) {
+ return Open(audio_format, mp);
+ }
+ } else if (IsOpen())
+ CloseWait();
+
+ return false;
+}
+
+void
+AudioOutput::LockPlay()
+{
+ const ScopeLock protect(mutex);
+
+ assert(allow_play);
+
+ if (IsOpen() && !in_playback_loop && !woken_for_play) {
+ woken_for_play = true;
+ cond.signal();
+ }
+}
+
+void
+AudioOutput::LockPauseAsync()
+{
+ if (mixer != nullptr && plugin.pause == nullptr)
+ /* the device has no pause mode: close the mixer,
+ unless its "global" flag is set (checked by
+ mixer_auto_close()) */
+ mixer_auto_close(mixer);
+
+ const ScopeLock protect(mutex);
+
+ assert(allow_play);
+ if (IsOpen())
+ CommandAsync(AO_COMMAND_PAUSE);
+}
+
+void
+AudioOutput::LockDrainAsync()
+{
+ const ScopeLock protect(mutex);
+
+ assert(allow_play);
+ if (IsOpen())
+ CommandAsync(AO_COMMAND_DRAIN);
+}
+
+void
+AudioOutput::LockCancelAsync()
+{
+ const ScopeLock protect(mutex);
+
+ if (IsOpen()) {
+ allow_play = false;
+ CommandAsync(AO_COMMAND_CANCEL);
+ }
+}
+
+void
+AudioOutput::LockAllowPlay()
+{
+ const ScopeLock protect(mutex);
+
+ allow_play = true;
+ if (IsOpen())
+ cond.signal();
+}
+
+void
+AudioOutput::LockRelease()
+{
+ if (always_on)
+ LockPauseAsync();
+ else
+ LockCloseWait();
+}
+
+void
+AudioOutput::LockCloseWait()
+{
+ assert(!open || !fail_timer.IsDefined());
+
+ const ScopeLock protect(mutex);
+ CloseWait();
+}
+
+void
+AudioOutput::StopThread()
+{
+ assert(thread.IsDefined());
+ assert(allow_play);
+
+ LockCommandWait(AO_COMMAND_KILL);
+ thread.Join();
+}
+
+void
+AudioOutput::Finish()
+{
+ LockCloseWait();
+
+ assert(!fail_timer.IsDefined());
+
+ if (thread.IsDefined())
+ StopThread();
+
+ audio_output_free(this);
+}