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 #if MEM > 1
  25 #define PCMBUF_TARGET_CHUNK 32768 /* This is the target fill size of chunks
  26                                      on the pcm buffer */
  27 #define PCMBUF_MINAVG_CHUNK 24576 /* This is the minimum average size of
  28                                      chunks on the pcm buffer (or we run out
  29                                      of buffer descriptors, which is
  30                                      non-fatal) */
  31 #else
  32 #define PCMBUF_TARGET_CHUNK 16384
  33 #define PCMBUF_MINAVG_CHUNK 12288
  34 #endif
  35
  36 #define PCMBUF_MIN_CHUNK     4096 /* We try to never feed a chunk smaller than
  37                                      this to the DMA */
  38 #define PCMBUF_MIX_CHUNK     8192 /* This is the maximum size of one packet
  39                                      for mixing (crossfade or voice) */
  40
  41 /* Returns true if the buffer needs to change size */
  42 bool pcmbuf_is_same_size(void);
  43 size_t pcmbuf_init(unsigned char *bufend);
  44 /* Size in bytes used by the pcmbuffer */
  45 size_t pcmbuf_get_bufsize(void);
  46 #ifdef ROCKBOX_HAS_LOGF
  47 /* just used for logging for now */
  48 unsigned char * pcmbuf_get_meminfo(size_t *length);
  49 #endif
  50
  51 void pcmbuf_pause(bool pause);
  52 void pcmbuf_play_stop(void);
  53 bool pcmbuf_is_crossfade_active(void);
  54
  55 /* These functions are for playing chained buffers of PCM data */
  56 #if defined(HAVE_ADJUSTABLE_CPU_FREQ)
  57 void pcmbuf_boost(bool state);
  58 void pcmbuf_set_boost_mode(bool state);
  59 #else
  60 #define pcmbuf_boost(state) do { } while(0)
  61 #define pcmbuf_set_boost_mode(state) do { } while(0)
  62 #endif
  63 bool pcmbuf_is_lowdata(void);
  64 void pcmbuf_play_start(void);
  65 bool pcmbuf_crossfade_init(bool manual_skip);
  66 void pcmbuf_set_event_handler(void (*callback)(void));
  67 void pcmbuf_set_position_callback(void (*callback)(size_t size));
  68 size_t pcmbuf_free(void);
  69 unsigned int pcmbuf_get_latency(void);
  70 void pcmbuf_set_low_latency(bool state);
  71 void * pcmbuf_request_buffer(int *count);
  72 void pcmbuf_write_complete(int count);
  73 void * pcmbuf_request_voice_buffer(int *count);
  74 void pcmbuf_write_voice_complete(int count);
  75 bool pcmbuf_is_crossfade_enabled(void);
  76 void pcmbuf_crossfade_enable(bool on_off);
  77 void pcmbuf_crossfade_enable_finished(void);
  78 int pcmbuf_usage(void);
  79 int pcmbuf_mix_free(void);
  80 void pcmbuf_beep(unsigned int frequency, size_t duration, int amplitude);
  81
  82 int pcmbuf_used_descs(void);
  83 int pcmbuf_descs(void);
  84
  85 #endif