rockbox/apps/pcmbuf.h

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 by Miika Pekkarinen
 *
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#ifndef PCMBUF_H
#define PCMBUF_H

#include <sys/types.h>

/* Commit PCM data */
void *pcmbuf_request_buffer(int *count);
void pcmbuf_write_complete(int count, unsigned long elapsed, off_t offset);

/* Init */
size_t pcmbuf_init(void *bufend);

/* Playback */
void pcmbuf_play_start(void);
void pcmbuf_play_stop(void);
void pcmbuf_pause(bool pause);

/* Track change */

/* Track change origin type */
enum pcm_track_change_type
{
    TRACK_CHANGE_NONE = 0,     /* No track change pending */
    TRACK_CHANGE_MANUAL,       /* Manual change (from user) */
    TRACK_CHANGE_AUTO,         /* Automatic change (from codec) */
    TRACK_CHANGE_AUTO_PILEUP,  /* Auto change during pending change */
    TRACK_CHANGE_END_OF_DATA,  /* Expect no more data (from codec) */
};
void pcmbuf_monitor_track_change(bool monitor);
void pcmbuf_start_track_change(enum pcm_track_change_type type);

/* Crossfade */
#ifdef HAVE_CROSSFADE
void pcmbuf_request_crossfade_enable(int setting);
bool pcmbuf_is_same_size(void);
#else
/* Dummy functions with sensible returns */
static FORCE_INLINE void pcmbuf_request_crossfade_enable(bool on_off)
    { return; (void)on_off; }
static FORCE_INLINE bool pcmbuf_is_same_size(void)
    { return true; }
#endif

/* Debug menu, other metrics */
size_t pcmbuf_free(void);
size_t pcmbuf_get_bufsize(void);
int pcmbuf_used_descs(void);
int pcmbuf_descs(void);

/* Fading and channel volume control */
void pcmbuf_fade(bool fade, bool in);
bool pcmbuf_fading(void);
void pcmbuf_soft_mode(bool shhh);

/* Time and position */
unsigned int pcmbuf_get_position_key(void);
void pcmbuf_sync_position_update(void);

/* Misc */
bool pcmbuf_is_lowdata(void);
void pcmbuf_set_low_latency(bool state);
void pcmbuf_update_frequency(void);
unsigned int pcmbuf_get_frequency(void);

#endif /* PCMBUF_H */