79e6a82b48
extensively as none of my testboxes have speakers or an audio source at present, but the chains built look correct and reading /dev/audio (ulaw, translated from signed 16 bit little-endian) gives values within the expected range for silence.
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*
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* Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct pcm_feederdesc {
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u_int32_t type;
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u_int32_t in, out;
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u_int32_t flags;
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int idx;
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};
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struct feeder_class {
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KOBJ_CLASS_FIELDS;
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int align;
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struct pcm_feederdesc *desc;
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void *data;
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};
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struct pcm_feeder {
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KOBJ_FIELDS;
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int align;
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struct pcm_feederdesc *desc;
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void *data;
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struct feeder_class *class;
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struct pcm_feeder *source, *parent;
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};
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void feeder_register(void *p);
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struct feeder_class *feeder_getclass(struct pcm_feederdesc *desc);
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u_int32_t chn_fmtchain(struct pcm_channel *c, u_int32_t *to);
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int chn_addfeeder(struct pcm_channel *c, struct feeder_class *fc, struct pcm_feederdesc *desc);
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int chn_removefeeder(struct pcm_channel *c);
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struct pcm_feeder *chn_findfeeder(struct pcm_channel *c, u_int32_t type);
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#define FEEDER_DECLARE(feeder, palign, pdata) \
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static struct feeder_class feeder ## _class = { \
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name: #feeder, \
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methods: feeder ## _methods, \
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size: sizeof(struct pcm_feeder), \
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align: palign, \
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desc: feeder ## _desc, \
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data: pdata, \
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}; \
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SYSINIT(feeder, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, feeder_register, &feeder ## _class);
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#define FEEDER_ROOT 1
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#define FEEDER_FMT 2
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#define FEEDER_MIXER 3
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#define FEEDER_RATE 4
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#define FEEDER_FILTER 5
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#define FEEDER_VOLUME 6
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#define FEEDER_LAST FEEDER_VOLUME
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#define FEEDRATE_SRC 1
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#define FEEDRATE_DST 2
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