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  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #ifndef PCMBUF_H
  20 #define PCMBUF_H
  21
  22 #if MEM > 1
  23 #define PCMBUF_TARGET_CHUNK 32768 /* This is the target fill size of chunks
  24                                      on the pcm buffer */
  25 #define PCMBUF_MINAVG_CHUNK 24576 /* This is the minimum average size of
  26                                      chunks on the pcm buffer (or we run out
  27                                      of buffer descriptors, which is
  28                                      non-fatal) */
  29 #else
  30 #define PCMBUF_TARGET_CHUNK 16384
  31 #define PCMBUF_MINAVG_CHUNK 12288
  32 #endif
  33
  34 #define PCMBUF_MIN_CHUNK     4096 /* We try to never feed a chunk smaller than
  35                                      this to the DMA */
  36 #define PCMBUF_MIX_CHUNK     8192 /* This is the maximum size of one packet
  37                                      for mixing (crossfade or voice) */
  38
  39 /* Returns true if the buffer needs to change size */
  40 bool pcmbuf_is_same_size(void);
  41 size_t pcmbuf_init(unsigned char *bufend);
  42 /* Size in bytes used by the pcmbuffer */
  43 size_t pcmbuf_get_bufsize(void);
  44 #ifdef ROCKBOX_HAS_LOGF
  45 /* just used for logging for now */
  46 unsigned char * pcmbuf_get_meminfo(size_t *length);
  47 #endif
  48 size_t get_pcmbuf_descsize(void);
  49
  50 void pcmbuf_pause(bool pause);
  51 void pcmbuf_play_stop(void);
  52 bool pcmbuf_is_crossfade_active(void);
  53
  54 /* These functions are for playing chained buffers of PCM data */
  55 #if defined(HAVE_ADJUSTABLE_CPU_FREQ)
  56 void pcmbuf_boost(bool state);
  57 void pcmbuf_set_boost_mode(bool state);
  58 #else
  59 #define pcmbuf_boost(state) do { } while(0)
  60 #define pcmbuf_set_boost_mode(state) do { } while(0)
  61 #endif
  62 bool pcmbuf_is_lowdata(void);
  63 void pcmbuf_play_start(void);
  64 bool pcmbuf_crossfade_init(bool manual_skip);
  65 void pcmbuf_set_event_handler(void (*callback)(void));
  66 void pcmbuf_set_position_callback(void (*callback)(size_t size));
  67 size_t pcmbuf_free(void);
  68 unsigned int pcmbuf_get_latency(void);
  69 void pcmbuf_set_low_latency(bool state);
  70 void pcmbuf_write_complete(int count);
  71 void* pcmbuf_request_buffer(int *count);
  72 void* pcmbuf_request_voice_buffer(int *count, bool mix);
  73 bool pcmbuf_is_crossfade_enabled(void);
  74 void pcmbuf_crossfade_enable(bool on_off);
  75 void pcmbuf_crossfade_enable_finished(void);
  76 int pcmbuf_usage(void);
  77 int pcmbuf_mix_free(void);
  78 void pcmbuf_beep(unsigned int frequency, size_t duration, int amplitude);
  79 void pcmbuf_mix_voice(int count);
  80
  81 int pcmbuf_used_descs(void);
  82 int pcmbuf_descs(void);
  83
  84 #endif