apps/pcmbuf.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Miika Pekkarinen
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifndef PCMBUF_H
  22 #define PCMBUF_H
  23
  24 #define PCMBUF_TARGET_CHUNK 32768 /* This is the target fill size of chunks
  25                                      on the pcm buffer */
  26 #define PCMBUF_MINAVG_CHUNK 24576 /* This is the minimum average size of
  27                                      chunks on the pcm buffer (or we run out
  28                                      of buffer descriptors, which is
  29                                      non-fatal) */
  30 #define PCMBUF_MIN_CHUNK     4096 /* We try to never feed a chunk smaller than
  31                                      this to the DMA */
  32 #define PCMBUF_MIX_CHUNK     8192 /* This is the maximum size of one packet
  33                                      for mixing (crossfade or voice) */
  34
  35 /* Returns true if the buffer needs to change size */
  36 bool pcmbuf_is_same_size(void);
  37 size_t pcmbuf_init(unsigned char *bufend);
  38 /* Size in bytes used by the pcmbuffer */
  39 size_t pcmbuf_get_bufsize(void);
  40 #ifdef ROCKBOX_HAS_LOGF
  41 /* just used for logging for now */
  42 unsigned char * pcmbuf_get_meminfo(size_t *length);
  43 #endif
  44
  45 void pcmbuf_pause(bool pause);
  46 void pcmbuf_play_stop(void);
  47 bool pcmbuf_is_crossfade_active(void);
  48
  49 /* These functions are for playing chained buffers of PCM data */
  50 #if defined(HAVE_ADJUSTABLE_CPU_FREQ)
  51 void pcmbuf_boost(bool state);
  52 void pcmbuf_set_boost_mode(bool state);
  53 #else
  54 #define pcmbuf_boost(state) do { } while(0)
  55 #define pcmbuf_set_boost_mode(state) do { } while(0)
  56 #endif
  57 bool pcmbuf_is_lowdata(void);
  58 void pcmbuf_play_start(void);
  59 bool pcmbuf_crossfade_init(bool manual_skip);
  60 void pcmbuf_set_event_handler(void (*callback)(void));
  61 void pcmbuf_set_position_callback(void (*callback)(size_t size));
  62 size_t pcmbuf_free(void);
  63 unsigned int pcmbuf_get_latency(void);
  64 void pcmbuf_set_low_latency(bool state);
  65 void * pcmbuf_request_buffer(int *count);
  66 void pcmbuf_write_complete(int count);
  67 void * pcmbuf_request_voice_buffer(int *count);
  68 void pcmbuf_write_voice_complete(int count);
  69 bool pcmbuf_is_crossfade_enabled(void);
  70 void pcmbuf_crossfade_enable(bool on_off);
  71 void pcmbuf_crossfade_enable_finished(void);
  72 int pcmbuf_usage(void);
  73 int pcmbuf_mix_free(void);
  74 void pcmbuf_beep(unsigned int frequency, size_t duration, int amplitude);
  75
  76 int pcmbuf_used_descs(void);
  77 int pcmbuf_descs(void);
  78
  79 #endif