FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/feeder.h

     /*-
      * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/dev/sound/pcm/feeder.h,v 1.12.2.1 2006/01/29 02:27:28 ariff Exp $
     * $DragonFly: src/sys/dev/sound/pcm/feeder.h,v 1.3 2007/01/04 21:47:03 corecode Exp $
     */
    
    struct pcm_feederdesc {
            u_int32_t type;
            u_int32_t in, out;
            u_int32_t flags;
            int idx;
    };
    
    struct feeder_class {
            KOBJ_CLASS_FIELDS;
            int align;
            struct pcm_feederdesc *desc;
            void *data;
    };
    
    struct pcm_feeder {
            KOBJ_FIELDS;
            int align;
            struct pcm_feederdesc *desc, desc_static;
            void *data;
            struct feeder_class *class;
            struct pcm_feeder *source, *parent;
    
    };
    
    void feeder_register(void *p);
    struct feeder_class *feeder_getclass(struct pcm_feederdesc *desc);
    
    int chn_fmtscore(u_int32_t fmt);
    u_int32_t chn_fmtbestbit(u_int32_t fmt, u_int32_t *fmts);
    u_int32_t chn_fmtbeststereo(u_int32_t fmt, u_int32_t *fmts);
    u_int32_t chn_fmtbest(u_int32_t fmt, u_int32_t *fmts);
    u_int32_t chn_fmtchain(struct pcm_channel *c, u_int32_t *to);
    int chn_addfeeder(struct pcm_channel *c, struct feeder_class *fc, struct pcm_feederdesc *desc);
    int chn_removefeeder(struct pcm_channel *c);
    struct pcm_feeder *chn_findfeeder(struct pcm_channel *c, u_int32_t type);
    void feeder_printchain(struct pcm_feeder *head);
    
    #define FEEDER_DECLARE(feeder, palign, pdata) \
    static struct feeder_class feeder ## _class = { \
            .name =         #feeder, \
            .methods =      feeder ## _methods, \
            .size =         sizeof(struct pcm_feeder), \
            .align =        palign, \
            .desc =         feeder ## _desc, \
            .data =         pdata, \
    }; \
    SYSINIT(feeder, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, feeder_register, &feeder ## _class);
    
    #define FEEDER_ROOT     1
    #define FEEDER_FMT      2
    #define FEEDER_MIXER    3
    #define FEEDER_RATE     4
    #define FEEDER_FILTER   5
    #define FEEDER_VOLUME   6
    #define FEEDER_LAST     FEEDER_VOLUME
    
    #define FEEDRATE_SRC    1
    #define FEEDRATE_DST    2
    
    

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