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*, 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 */ 91