115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
/*
|
|
* Copyright 2003-2018 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.
|
|
*/
|
|
|
|
#ifndef MPD_PLAYER_OUTPUT_INTERFACE_HXX
|
|
#define MPD_PLAYER_OUTPUT_INTERFACE_HXX
|
|
|
|
#include "MusicChunkPtr.hxx"
|
|
#include "Chrono.hxx"
|
|
#include "util/Compiler.h"
|
|
|
|
struct AudioFormat;
|
|
struct MusicChunk;
|
|
|
|
/**
|
|
* An interface for the player thread to control all outputs. This
|
|
* interface is implemented only by #MultipleOutputs, and exists only
|
|
* to decouple the player code from the output code, to be able to
|
|
* unit-test the player code.
|
|
*/
|
|
class PlayerOutputs {
|
|
public:
|
|
/**
|
|
* Checks the "enabled" flag of all audio outputs, and if one has
|
|
* changed, commit the change.
|
|
*
|
|
* Throws on error.
|
|
*/
|
|
virtual void EnableDisable() = 0;
|
|
|
|
/**
|
|
* Opens all audio outputs which are not disabled.
|
|
*
|
|
* Throws on error.
|
|
*
|
|
* @param audio_format the preferred audio format
|
|
*/
|
|
virtual void Open(const AudioFormat audio_format) = 0;
|
|
|
|
/**
|
|
* Closes all audio outputs.
|
|
*/
|
|
virtual void Close() noexcept = 0;
|
|
|
|
/**
|
|
* Closes all audio outputs. Outputs with the "always_on"
|
|
* flag are put into pause mode.
|
|
*/
|
|
virtual void Release() noexcept = 0;
|
|
|
|
/**
|
|
* Enqueue a #MusicChunk object for playing, i.e. pushes it to a
|
|
* #MusicPipe.
|
|
*
|
|
* Throws on error (all closed then).
|
|
*
|
|
* @param chunk the #MusicChunk object to be played
|
|
*/
|
|
virtual void Play(MusicChunkPtr chunk) = 0;
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
virtual unsigned CheckPipe() noexcept = 0;
|
|
|
|
/**
|
|
* Puts all audio outputs into pause mode. Most implementations will
|
|
* simply close it then.
|
|
*/
|
|
virtual void Pause() noexcept = 0;
|
|
|
|
/**
|
|
* Drain all audio outputs.
|
|
*/
|
|
virtual void Drain() noexcept = 0;
|
|
|
|
/**
|
|
* Try to cancel data which may still be in the device's buffers.
|
|
*/
|
|
virtual void Cancel() noexcept = 0;
|
|
|
|
/**
|
|
* Indicate that a new song will begin now.
|
|
*/
|
|
virtual void SongBorder() noexcept = 0;
|
|
|
|
/**
|
|
* 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
|
|
virtual SignedSongTime GetElapsedTime() const noexcept = 0;
|
|
};
|
|
|
|
#endif
|