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91 lines
3.3 KiB
91 lines
3.3 KiB
20 years ago
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/*
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**********************************************************************
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* cardwo.h -- header file for card wave out functions
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* Copyright 1999, 2000 Creative Labs, Inc.
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*
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**********************************************************************
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*
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* Date Author Summary of changes
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* ---- ------ ------------------
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* October 20, 1999 Bertrand Lee base code release
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*
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**********************************************************************
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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**********************************************************************
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*/
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#ifndef _CARDWO_H
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#define _CARDWO_H
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#include "icardwav.h"
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#include "audio.h"
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#include "voicemgr.h"
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#include "timer.h"
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/* setting this to other than a power of two may break some applications */
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#define WAVEOUT_MAXBUFSIZE MAXBUFSIZE
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#define WAVEOUT_DEFAULTFRAGLEN 20 /* Time to play a fragment in ms (latency) */
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#define WAVEOUT_DEFAULTBUFLEN 500 /* Time to play the entire buffer in ms */
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#define WAVEOUT_MINFRAGSHIFT 6 /* Minimum fragment size in bytes is 2^6 */
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#define WAVEOUT_MINFRAGS 3 /* _don't_ go bellow 3, it would break silence filling */
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#define WAVEOUT_MAXVOICES 6
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struct waveout_buffer {
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u16 ossfragshift;
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u32 numfrags;
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u32 fragment_size; /* in bytes units */
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u32 size; /* in bytes units */
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u32 pages; /* buffer size in page units*/
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u32 silence_pos; /* software cursor position (including silence bytes) */
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u32 hw_pos; /* hardware cursor position */
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u32 free_bytes; /* free bytes available on the buffer (not including silence bytes) */
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u8 fill_silence;
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u32 silence_bytes; /* silence bytes on the buffer */
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};
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struct woinst
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{
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u8 state;
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u8 num_voices;
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struct emu_voice voice[WAVEOUT_MAXVOICES];
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struct emu_timer timer;
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struct wave_format format;
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struct waveout_buffer buffer;
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wait_queue_head_t wait_queue;
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u8 mmapped;
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u32 total_copied; /* total number of bytes written() to the buffer (excluding silence) */
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u32 total_played; /* total number of bytes played including silence */
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u32 blocks;
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u8 device;
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spinlock_t lock;
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};
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int emu10k1_waveout_open(struct emu10k1_wavedevice *);
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void emu10k1_waveout_close(struct emu10k1_wavedevice *);
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void emu10k1_waveout_start(struct emu10k1_wavedevice *);
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void emu10k1_waveout_stop(struct emu10k1_wavedevice *);
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void emu10k1_waveout_getxfersize(struct woinst*, u32 *);
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void emu10k1_waveout_xferdata(struct woinst*, u8 __user *, u32 *);
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void emu10k1_waveout_fillsilence(struct woinst*);
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int emu10k1_waveout_setformat(struct emu10k1_wavedevice*, struct wave_format*);
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void emu10k1_waveout_update(struct woinst*);
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#endif /* _CARDWO_H */
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