apps/buffering.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 Nicolas Pennequin
  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
  20 #ifndef _BUFFERING_H_
  21 #define _BUFFERING_H_
  22
  23 #include <sys/types.h>
  24 #include <stdbool.h>
  25
  26
  27 /* default point to start buffer refill */
  28 #define AUDIO_DEFAULT_WATERMARK      (1024*512)
  29 /* amount of data to read in one read() call */
  30 #define AUDIO_DEFAULT_FILECHUNK      (1024*32)
  31 /* point at which the file buffer will fight for CPU time */
  32 #define AUDIO_FILEBUF_CRITICAL       (1024*128)
  33 /* amount of guess-space to allow for codecs that must hunt and peck
  34  * for their correct seeek target, 32k seems a good size */
  35 #define AUDIO_REBUFFER_GUESS_SIZE    (1024*32)
  36
  37
  38 enum data_type {
  39     TYPE_CODEC,
  40     TYPE_AUDIO,
  41     TYPE_STREAM,
  42     TYPE_ID3,
  43     TYPE_CUESHEET,
  44     TYPE_IMAGE,
  45     TYPE_BUFFER,
  46     TYPE_UNKNOWN,
  47 };
  48
  49 enum {
  50     Q_BUFFER_HANDLE = 1,
  51     Q_RESET_HANDLE,
  52 };
  53
  54 struct event_queue          buffering_queue;
  55 struct queue_sender_list    buffering_queue_sender_list;
  56
  57 bool buffering_init(char *filebuf, size_t filebuflen);
  58 size_t bufused(void);
  59 int bufopen(char *file, size_t offset, enum data_type type);
  60 int bufalloc(void *src, size_t size, enum data_type type);
  61 int bufclose(int handle_id);
  62 int bufseek(int handle_id, size_t newpos);
  63 int bufadvance(int handle_id, off_t offset);
  64 ssize_t bufread(int handle_id, size_t size, char *dest);
  65 ssize_t bufgetdata(int handle_id, size_t size, unsigned char **data);
  66 ssize_t get_offset(int handle_id, void *ptr);
  67
  68 #endif