sound/oss/emu10k1/cardwo.h

   1 /*
   2  **********************************************************************
   3  *     cardwo.h -- header file for card wave out functions
   4  *     Copyright 1999, 2000 Creative Labs, Inc.
   5  *
   6  **********************************************************************
   7  *
   8  *     Date                 Author          Summary of changes
   9  *     ----                 ------          ------------------
  10  *     October 20, 1999     Bertrand Lee    base code release
  11  *
  12  **********************************************************************
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public
  25  *     License along with this program; if not, write to the Free
  26  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  27  *     USA.
  28  *
  29  **********************************************************************
  30  */
  31
  32 #ifndef _CARDWO_H
  33 #define _CARDWO_H
  34
  35 #include "icardwav.h"
  36 #include "audio.h"
  37 #include "voicemgr.h"
  38 #include "timer.h"
  39
  40 /* setting this to other than a power of two may break some applications */
  41 #define WAVEOUT_MAXBUFSIZE      MAXBUFSIZE
  42
  43 #define WAVEOUT_DEFAULTFRAGLEN  20 /* Time to play a fragment in ms (latency) */
  44 #define WAVEOUT_DEFAULTBUFLEN   500 /* Time to play the entire buffer in ms */
  45
  46 #define WAVEOUT_MINFRAGSHIFT    6 /* Minimum fragment size in bytes is 2^6 */
  47 #define WAVEOUT_MINFRAGS        3 /* _don't_ go bellow 3, it would break silence filling */
  48 #define WAVEOUT_MAXVOICES       6
  49
  50 struct waveout_buffer {
  51         u16 ossfragshift;
  52         u32 numfrags;
  53         u32 fragment_size;      /* in bytes units */
  54         u32 size;               /* in bytes units */
  55         u32 pages;              /* buffer size in page units*/
  56         u32 silence_pos;        /* software cursor position (including silence bytes) */
  57         u32 hw_pos;             /* hardware cursor position */
  58         u32 free_bytes;         /* free bytes available on the buffer (not including silence bytes) */
  59         u8 fill_silence;
  60         u32 silence_bytes;      /* silence bytes on the buffer */
  61 };
  62
  63 struct woinst
  64 {
  65         u8 state;
  66         u8 num_voices;
  67         struct emu_voice voice[WAVEOUT_MAXVOICES];
  68         struct emu_timer timer;
  69         struct wave_format format;
  70         struct waveout_buffer buffer;
  71         wait_queue_head_t wait_queue;
  72         u8 mmapped;
  73         u32 total_copied;       /* total number of bytes written() to the buffer (excluding silence) */
  74         u32 total_played;       /* total number of bytes played including silence */
  75         u32 blocks;
  76         u8 device;
  77         spinlock_t lock;
  78 };
  79
  80 int emu10k1_waveout_open(struct emu10k1_wavedevice *);
  81 void emu10k1_waveout_close(struct emu10k1_wavedevice *);
  82 void emu10k1_waveout_start(struct emu10k1_wavedevice *);
  83 void emu10k1_waveout_stop(struct emu10k1_wavedevice *);
  84 void emu10k1_waveout_getxfersize(struct woinst*, u32 *);
  85 void emu10k1_waveout_xferdata(struct woinst*, u8 __user *, u32 *);
  86 void emu10k1_waveout_fillsilence(struct woinst*);
  87 int emu10k1_waveout_setformat(struct emu10k1_wavedevice*, struct wave_format*);
  88 void emu10k1_waveout_update(struct woinst*);
  89
  90 #endif /* _CARDWO_H */