The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/midi/midibuf.h

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    1 /*
    2  * Include file for midi buffer.
    3  * 
    4  * Copyright by Seigo Tanimura 1999.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/5.0/sys/dev/sound/midi/midibuf.h 88773 2002-01-01 17:36:26Z tanimura $
   28  *
   29  */
   30 
   31 /*      
   32  * descriptor of a midi buffer. See midibuf.c for documentation.
   33  * (rp,rl) and (fp,fl) identify the READY and FREE regions of the
   34  * buffer. dl contains the length used for dma transfer, dl>0 also
   35  * means that the channel is busy and there is a DMA transfer in progress.
   36  */     
   37 
   38 typedef struct _midi_dbuf {
   39         char *buf;
   40         int     bufsize ;
   41         volatile int rp, fp;            /* pointers to the ready and free area */
   42         volatile int dl;                /* transfer size */
   43         volatile int rl, fl;            /* length of ready and free areas. */
   44         int int_count;
   45         int chan;                       /* dma channel */
   46         int unit_size ;                 /* unit size */
   47         struct selinfo sel;
   48         u_long total;                   /* total bytes processed */
   49         u_long prev_total;              /* copy of the above when GETxPTR called */
   50         struct cv cv_in, cv_out;        /* condvars */
   51         int blocksize;                  /* block size */
   52 } midi_dbuf ;
   53 
   54 /*
   55  * These are the midi buffer methods, used in midi interface devices.
   56  */
   57 int midibuf_init(midi_dbuf *dbuf);
   58 int midibuf_destroy(midi_dbuf *dbuf);
   59 int midibuf_clear(midi_dbuf *dbuf);
   60 int midibuf_seqwrite(midi_dbuf *dbuf, u_char* data, int len, int *lenw, midi_callback_t *cb, void *d, int reason, struct mtx *m);
   61 int midibuf_output_intr(midi_dbuf *dbuf, u_char *data, int len, int *leno);
   62 int midibuf_input_intr(midi_dbuf *dbuf, u_char *data, int len, int *leni);
   63 int midibuf_seqread(midi_dbuf *dbuf, u_char* data, int len, int *lenr, midi_callback_t *cb, void *d, int reason, struct mtx *m);
   64 int midibuf_seqcopy(midi_dbuf *dbuf, u_char* data, int len, int *lenc, midi_callback_t *cb, void *d, int reason, struct mtx *m);
   65 int midibuf_seqdelete(midi_dbuf *dbuf, int len, int *lend, midi_callback_t *cb, void *d, int reason, struct mtx *m);

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