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+/*
+ * 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.
+ */
+
+/*
+ * Functions for dealing with all configured (enabled) audion outputs
+ * at once.
+ *
+ */
+
+#ifndef OUTPUT_ALL_H
+#define OUTPUT_ALL_H
+
+#include "AudioFormat.hxx"
+#include "ReplayGainInfo.hxx"
+#include "Compiler.h"
+
+#include <vector>
+
+#include <assert.h>
+
+struct AudioFormat;
+class MusicBuffer;
+class MusicPipe;
+class EventLoop;
+class MixerListener;
+struct music_chunk;
+struct PlayerControl;
+struct AudioOutput;
+class Error;
+
+class MultipleOutputs {
+ MixerListener &mixer_listener;
+
+ std::vector<AudioOutput *> outputs;
+
+ AudioFormat input_audio_format;
+
+ /**
+ * The #MusicBuffer object where consumed chunks are returned.
+ */
+ MusicBuffer *buffer;
+
+ /**
+ * The #MusicPipe object which feeds all audio outputs. It is
+ * filled by audio_output_all_play().
+ */
+ MusicPipe *pipe;
+
+ /**
+ * The "elapsed_time" stamp of the most recently finished
+ * chunk.
+ */
+ float elapsed_time;
+
+public:
+ /**
+ * Load audio outputs from the configuration file and
+ * initialize them.
+ */
+ MultipleOutputs(MixerListener &_mixer_listener);
+ ~MultipleOutputs();
+
+ void Configure(EventLoop &event_loop, PlayerControl &pc);
+
+ /**
+ * Returns the total number of audio output devices, including
+ * those which are disabled right now.
+ */
+ gcc_pure
+ unsigned Size() const {
+ return outputs.size();
+ }
+
+ /**
+ * Returns the "i"th audio output device.
+ */
+ const AudioOutput &Get(unsigned i) const {
+ assert(i < Size());
+
+ return *outputs[i];
+ }
+
+ AudioOutput &Get(unsigned i) {
+ assert(i < Size());
+
+ return *outputs[i];
+ }
+
+ /**
+ * Returns the audio output device with the specified name.
+ * Returns nullptr if the name does not exist.
+ */
+ gcc_pure
+ AudioOutput *FindByName(const char *name) const;
+
+ /**
+ * Checks the "enabled" flag of all audio outputs, and if one has
+ * changed, commit the change.
+ */
+ void EnableDisable();
+
+ /**
+ * Opens all audio outputs which are not disabled.
+ *
+ * @param audio_format the preferred audio format
+ * @param buffer the #music_buffer where consumed #music_chunk objects
+ * should be returned
+ * @return true on success, false on failure
+ */
+ bool Open(const AudioFormat audio_format, MusicBuffer &_buffer,
+ Error &error);
+
+ /**
+ * Closes all audio outputs.
+ */
+ void Close();
+
+ /**
+ * Closes all audio outputs. Outputs with the "always_on"
+ * flag are put into pause mode.
+ */
+ void Release();
+
+ void SetReplayGainMode(ReplayGainMode mode);
+
+ /**
+ * Enqueue a #music_chunk object for playing, i.e. pushes it to a
+ * #MusicPipe.
+ *
+ * @param chunk the #music_chunk object to be played
+ * @return true on success, false if no audio output was able to play
+ * (all closed then)
+ */
+ bool Play(music_chunk *chunk, Error &error);
+
+ /**
+ * Checks if the output devices have drained their music pipe, and
+ * returns the consumed music chunks to the #music_buffer.
+ *
+ * @return the number of chunks to play left in the #MusicPipe
+ */
+ unsigned Check();
+
+ /**
+ * Checks if the size of the #MusicPipe is below the #threshold. If
+ * not, it attempts to synchronize with all output threads, and waits
+ * until another #music_chunk is finished.
+ *
+ * @param threshold the maximum number of chunks in the pipe
+ * @return true if there are less than #threshold chunks in the pipe
+ */
+ bool Wait(PlayerControl &pc, unsigned threshold);
+
+ /**
+ * Puts all audio outputs into pause mode. Most implementations will
+ * simply close it then.
+ */
+ void Pause();
+
+ /**
+ * Drain all audio outputs.
+ */
+ void Drain();
+
+ /**
+ * Try to cancel data which may still be in the device's buffers.
+ */
+ void Cancel();
+
+ /**
+ * Indicate that a new song will begin now.
+ */
+ void SongBorder();
+
+ /**
+ * Returns the "elapsed_time" stamp of the most recently finished
+ * chunk. A negative value is returned when no chunk has been
+ * finished yet.
+ */
+ gcc_pure
+ float GetElapsedTime() const {
+ return elapsed_time;
+ }
+
+ /**
+ * Returns the average volume of all available mixers (range
+ * 0..100). Returns -1 if no mixer can be queried.
+ */
+ gcc_pure
+ int GetVolume() const;
+
+ /**
+ * Sets the volume on all available mixers.
+ *
+ * @param volume the volume (range 0..100)
+ * @return true on success, false on failure
+ */
+ bool SetVolume(unsigned volume);
+
+ /**
+ * Similar to GetVolume(), but gets the volume only for
+ * software mixers. See #software_mixer_plugin. This
+ * function fails if no software mixer is configured.
+ */
+ gcc_pure
+ int GetSoftwareVolume() const;
+
+ /**
+ * Similar to SetVolume(), but sets the volume only for
+ * software mixers. See #software_mixer_plugin. This
+ * function cannot fail, because the underlying software
+ * mixers cannot fail either.
+ */
+ void SetSoftwareVolume(unsigned volume);
+
+private:
+ /**
+ * Determine if all (active) outputs have finished the current
+ * command.
+ */
+ gcc_pure
+ bool AllFinished() const;
+
+ void WaitAll();
+
+ /**
+ * Signals all audio outputs which are open.
+ */
+ void AllowPlay();
+
+ /**
+ * Resets the "reopen" flag on all audio devices. MPD should
+ * immediately retry to open the device instead of waiting for
+ * the timeout when the user wants to start playback.
+ */
+ void ResetReopen();
+
+ /**
+ * Opens all output devices which are enabled, but closed.
+ *
+ * @return true if there is at least open output device which
+ * is open
+ */
+ bool Update();
+
+ /**
+ * Has this chunk been consumed by all audio outputs?
+ */
+ bool IsChunkConsumed(const music_chunk *chunk) const;
+
+ /**
+ * There's only one chunk left in the pipe (#pipe), and all
+ * audio outputs have consumed it already. Clear the
+ * reference.
+ */
+ void ClearTailChunk(const struct music_chunk *chunk, bool *locked);
+};
+
+#endif