/*
* 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 MusicChunk;
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 #MusicChunk 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 #MusicChunk object for playing, i.e. pushes it to a
* #MusicPipe.
*
* @param chunk the #MusicChunk object to be played
* @return true on success, false if no audio output was able to play
* (all closed then)
*/
bool Play(MusicChunk *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 #MusicChunk 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 MusicChunk *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 MusicChunk *chunk, bool *locked);
};
#endif
