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/*
* Copyright (C) 2003-2010 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 <stdbool.h>
#include <stddef.h>
struct audio_format;
struct music_buffer;
struct music_chunk;
/**
* Global initialization: load audio outputs from the configuration
* file and initialize them.
*/
void
audio_output_all_init(void);
/**
* Global finalization: free memory occupied by audio outputs. All
*/
void
audio_output_all_finish(void);
/**
* Returns the total number of audio output devices, including those
* who are disabled right now.
*/
unsigned int audio_output_count(void);
/**
* Returns the "i"th audio output device.
*/
struct audio_output *
audio_output_get(unsigned i);
/**
* Returns the audio output device with the specified name. Returns
* NULL if the name does not exist.
*/
struct audio_output *
audio_output_find(const char *name);
/**
* Checks the "enabled" flag of all audio outputs, and if one has
* changed, commit the change.
*/
void
audio_output_all_enable_disable(void);
/**
* Opens all audio outputs which are not disabled.
*
* @param audio_format the preferred audio format, or NULL to reuse
* the previous format
* @param buffer the #music_buffer where consumed #music_chunk objects
* should be returned
* @return true on success, false on failure
*/
bool
audio_output_all_open(const struct audio_format *audio_format,
struct music_buffer *buffer);
/**
* Closes all audio outputs.
*/
void
audio_output_all_close(void);
/**
* Enqueue a #music_chunk object for playing, i.e. pushes it to a
* #music_pipe.
*
* @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
audio_output_all_play(struct music_chunk *chunk);
/**
* 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 #music_pipe
*/
unsigned
audio_output_all_check(void);
/**
* Checks if the size of the #music_pipe 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
audio_output_all_wait(unsigned threshold);
/**
* Puts all audio outputs into pause mode. Most implementations will
* simply close it then.
*/
void
audio_output_all_pause(void);
/**
* Drain all audio outputs.
*/
void
audio_output_all_drain(void);
/**
* Try to cancel data which may still be in the device's buffers.
*/
void
audio_output_all_cancel(void);
/**
* Returns the "elapsed_time" stamp of the most recently finished
* chunk. A negative value is returned when no chunk has been
* finished yet.
*/
float
audio_output_all_get_elapsed_time(void);
#endif
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