404 lines
12 KiB
C
404 lines
12 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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* $Id$
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*/
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#include <dev/pcm/sound.h>
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static int chn_addfeeder(pcm_channel *c, pcm_feeder *f);
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static int chn_removefeeder(pcm_channel *c);
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#define FEEDBUFSZ 8192
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static unsigned char ulaw_to_u8[] = {
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3, 7, 11, 15, 19, 23, 27, 31,
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35, 39, 43, 47, 51, 55, 59, 63,
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66, 68, 70, 72, 74, 76, 78, 80,
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82, 84, 86, 88, 90, 92, 94, 96,
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98, 99, 100, 101, 102, 103, 104, 105,
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106, 107, 108, 109, 110, 111, 112, 113,
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113, 114, 114, 115, 115, 116, 116, 117,
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117, 118, 118, 119, 119, 120, 120, 121,
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121, 121, 122, 122, 122, 122, 123, 123,
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123, 123, 124, 124, 124, 124, 125, 125,
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125, 125, 125, 125, 126, 126, 126, 126,
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126, 126, 126, 126, 127, 127, 127, 127,
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127, 127, 127, 127, 127, 127, 127, 127,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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253, 249, 245, 241, 237, 233, 229, 225,
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221, 217, 213, 209, 205, 201, 197, 193,
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190, 188, 186, 184, 182, 180, 178, 176,
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174, 172, 170, 168, 166, 164, 162, 160,
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158, 157, 156, 155, 154, 153, 152, 151,
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150, 149, 148, 147, 146, 145, 144, 143,
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143, 142, 142, 141, 141, 140, 140, 139,
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139, 138, 138, 137, 137, 136, 136, 135,
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135, 135, 134, 134, 134, 134, 133, 133,
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133, 133, 132, 132, 132, 132, 131, 131,
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131, 131, 131, 131, 130, 130, 130, 130,
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130, 130, 130, 130, 129, 129, 129, 129,
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129, 129, 129, 129, 129, 129, 129, 129,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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};
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static unsigned char u8_to_ulaw[] = {
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0, 0, 0, 0, 0, 1, 1, 1,
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1, 2, 2, 2, 2, 3, 3, 3,
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3, 4, 4, 4, 4, 5, 5, 5,
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5, 6, 6, 6, 6, 7, 7, 7,
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7, 8, 8, 8, 8, 9, 9, 9,
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9, 10, 10, 10, 10, 11, 11, 11,
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11, 12, 12, 12, 12, 13, 13, 13,
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13, 14, 14, 14, 14, 15, 15, 15,
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15, 16, 16, 17, 17, 18, 18, 19,
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19, 20, 20, 21, 21, 22, 22, 23,
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23, 24, 24, 25, 25, 26, 26, 27,
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27, 28, 28, 29, 29, 30, 30, 31,
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31, 32, 33, 34, 35, 36, 37, 38,
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39, 40, 41, 42, 43, 44, 45, 46,
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47, 49, 51, 53, 55, 57, 59, 61,
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63, 66, 70, 74, 78, 84, 92, 104,
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254, 231, 219, 211, 205, 201, 197, 193,
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190, 188, 186, 184, 182, 180, 178, 176,
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175, 174, 173, 172, 171, 170, 169, 168,
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167, 166, 165, 164, 163, 162, 161, 160,
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159, 159, 158, 158, 157, 157, 156, 156,
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155, 155, 154, 154, 153, 153, 152, 152,
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151, 151, 150, 150, 149, 149, 148, 148,
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147, 147, 146, 146, 145, 145, 144, 144,
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143, 143, 143, 143, 142, 142, 142, 142,
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141, 141, 141, 141, 140, 140, 140, 140,
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139, 139, 139, 139, 138, 138, 138, 138,
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137, 137, 137, 137, 136, 136, 136, 136,
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135, 135, 135, 135, 134, 134, 134, 134,
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133, 133, 133, 133, 132, 132, 132, 132,
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131, 131, 131, 131, 130, 130, 130, 130,
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129, 129, 129, 129, 128, 128, 128, 128,
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};
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/*****************************************************************************/
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static int
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feed_root(pcm_feeder *feeder, u_int8_t *buffer, u_int32_t count, struct uio *stream)
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{
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int ret, tmp;
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if (!count) panic("feed_root: count == 0");
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tmp = stream->uio_resid;
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ret = uiomove(buffer, count, stream);
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if (ret) panic("feed_root: uiomove failed");
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tmp -= stream->uio_resid;
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if (!tmp) panic("feed_root: uiomove didn't");
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return tmp;
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}
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pcm_feeder feeder_root = { "root", NULL, NULL, feed_root };
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/*****************************************************************************/
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static int
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feed_8to16(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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int i, j, k;
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k = f->source->feed(f->source, b, count / 2, stream);
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j = k - 1;
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i = j * 2 + 1;
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while (i > 0 && j >= 0) {
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b[i--] = b[j--];
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b[i--] = 0;
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}
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return k * 2;
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}
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static pcm_feeder feeder_8to16 = { "8to16", NULL, NULL, feed_8to16 };
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/*****************************************************************************/
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static int
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feed_16to8_init(pcm_feeder *f)
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{
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f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT);
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return (f->data == NULL);
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}
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static int
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feed_16to8_free(pcm_feeder *f)
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{
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if (f->data) free(f->data, M_DEVBUF);
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f->data = NULL;
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return 0;
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}
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static int
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feed_16to8le(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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u_int32_t i = 0, toget = count * 2;
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int j = 1, k;
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k = f->source->feed(f->source, f->data, min(toget, FEEDBUFSZ), stream);
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while (j < k) {
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b[i++] = ((u_int8_t *)f->data)[j];
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j += 2;
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}
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return i;
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}
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static pcm_feeder feeder_16to8le =
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{ "16to8le", feed_16to8_init, feed_16to8_free, feed_16to8le };
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/*****************************************************************************/
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static int
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feed_monotostereo8(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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int i, j, k = f->source->feed(f->source, b, count / 2, stream);
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j = k - 1;
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i = j * 2 + 1;
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while (i > 0 && j >= 0) {
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b[i--] = b[j];
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b[i--] = b[j];
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j--;
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}
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return k * 2;
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}
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static pcm_feeder feeder_monotostereo8 =
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{ "monotostereo8", NULL, NULL, feed_monotostereo8 };
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/*****************************************************************************/
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static int
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feed_stereotomono8_init(pcm_feeder *f)
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{
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f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT);
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return (f->data == NULL);
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}
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static int
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feed_stereotomono8_free(pcm_feeder *f)
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{
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if (f->data) free(f->data, M_DEVBUF);
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f->data = NULL;
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return 0;
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}
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static int
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feed_stereotomono8(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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u_int32_t i = 0, toget = count * 2;
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int j = 0, k;
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k = f->source->feed(f->source, f->data, min(toget, FEEDBUFSZ), stream);
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while (j < k) {
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b[i++] = ((u_int8_t *)f->data)[j];
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j += 2;
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}
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return i;
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}
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static pcm_feeder feeder_stereotomono8 =
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{ "stereotomono8", feed_stereotomono8_init, feed_stereotomono8_free,
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feed_stereotomono8 };
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/*****************************************************************************/
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static int
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feed_endian(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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u_int8_t t;
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int i = 0, j = f->source->feed(f->source, b, count, stream);
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while (i < j) {
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t = b[i];
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b[i] = b[i + 1];
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b[i + 1] = t;
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i += 2;
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}
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return count;
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}
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static pcm_feeder feeder_endian = { "endian", NULL, NULL, feed_endian };
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/*****************************************************************************/
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static int
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feed_sign(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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int i = 0, j = f->source->feed(f->source, b, count, stream);
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int ssz = (int)f->data, ofs = ssz - 1;
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while (i < j) {
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b[i + ofs] ^= 0x80;
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i += ssz;
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}
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return i;
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}
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static pcm_feeder feeder_sign8 =
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{ "sign8", NULL, NULL, feed_sign, (void *)1 };
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static pcm_feeder feeder_sign16 =
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{ "sign16", NULL, NULL, feed_sign, (void *)2 };
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/*****************************************************************************/
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static int
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feed_table(pcm_feeder *f, u_int8_t *b, u_int32_t count, struct uio *stream)
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{
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int i = 0, j = f->source->feed(f->source, b, count, stream);
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while (i < j) {
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b[i] = ((u_int8_t *)f->data)[b[i]];
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i++;
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}
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return i;
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}
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static pcm_feeder feeder_ulawtou8 =
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{ "ulawtou8", NULL, NULL, feed_table, ulaw_to_u8 };
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static pcm_feeder feeder_u8toulaw =
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{ "u8toulaw", NULL, NULL, feed_table, u8_to_ulaw };
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/*****************************************************************************/
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struct fmtspec {
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int stereo;
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int sign;
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int bit16;
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int bigendian;
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int ulaw;
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int bad;
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};
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struct fmtcvt {
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pcm_feeder *f;
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struct fmtspec ispec, ospec;
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};
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struct fmtcvt cvttab[] = {
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{&feeder_ulawtou8, {-1, 0, 0, 0, 1}, {-1, 0, 0, 0, 0}},
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{&feeder_u8toulaw, {-1, 0, 0, 0, 0}, {-1, 0, 0, 0, 1}},
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{&feeder_sign8, {-1, 0, 0, 0, 0}, {-1, 1, 0, 0, 0}},
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{&feeder_sign8, {-1, 1, 0, 0, 0}, {-1, 0, 0, 0, 0}},
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{&feeder_monotostereo8, { 0, -1, 0, 0, -1}, { 1, -1, 0, 0, -1}},
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{&feeder_stereotomono8, { 1, -1, 0, 0, -1}, { 0, -1, 0, 0, -1}},
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{&feeder_sign16, {-1, 0, 1, 0, 0}, {-1, 1, 1, 0, 0}},
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{&feeder_sign16, {-1, 1, 1, 0, 0}, {-1, 0, 1, 0, 0}},
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{&feeder_8to16, {-1, -1, 0, 0, 0}, {-1, -1, 1, 0, 0}},
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{&feeder_16to8le, {-1, -1, 1, 0, 0}, {-1, -1, 0, 0, 0}},
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{&feeder_endian, {-1, -1, 1, 0, 0}, {-1, -1, 1, 1, 0}},
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{&feeder_endian, {-1, -1, 1, 1, 0}, {-1, -1, 1, 0, 0}},
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};
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#define FEEDERTABSZ (sizeof(cvttab) / sizeof(struct fmtcvt))
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static int
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getspec(u_int32_t fmt, struct fmtspec *spec)
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{
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spec->stereo = (fmt & AFMT_STEREO)? 1 : 0;
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spec->sign = (fmt & AFMT_SIGNED)? 1 : 0;
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spec->bit16 = (fmt & AFMT_16BIT)? 1 : 0;
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spec->bigendian = (fmt & AFMT_BIGENDIAN)? 1 : 0;
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spec->ulaw = (fmt & AFMT_MU_LAW)? 1 : 0;
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spec->bad = (fmt & (AFMT_A_LAW | AFMT_MPEG))? 1 : 0;
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return 0;
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}
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static int
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cmp(int x, int y)
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{
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return (x == -1 || x == y || y == -1)? 1 : 0;
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}
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static int
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cmpspec(struct fmtspec *x, struct fmtspec *y)
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{
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int i = 0;
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if (cmp(x->stereo, y->stereo)) i |= 0x01;
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if (cmp(x->sign, y->sign)) i |= 0x02;
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if (cmp(x->bit16, y->bit16)) i |= 0x04;
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if (cmp(x->bigendian, y->bigendian)) i |= 0x08;
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if (cmp(x->ulaw, y->ulaw)) i |= 0x10;
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return i;
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}
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static int
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cvtapply(pcm_channel *c, struct fmtcvt *cvt, struct fmtspec *s)
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{
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int i = cmpspec(s, &cvt->ospec);
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chn_addfeeder(c, cvt->f);
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if (cvt->ospec.stereo != -1) s->stereo = cvt->ospec.stereo;
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if (cvt->ospec.sign != -1) s->sign = cvt->ospec.sign;
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if (cvt->ospec.bit16 != -1) s->bit16 = cvt->ospec.bit16;
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if (cvt->ospec.bigendian != -1) s->bigendian = cvt->ospec.bigendian;
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if (cvt->ospec.ulaw != -1) s->ulaw = cvt->ospec.ulaw;
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return i;
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}
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int
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chn_feedchain(pcm_channel *c)
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{
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int i, chosen, iter;
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u_int32_t mask;
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struct fmtspec s, t;
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struct fmtcvt *e;
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while (chn_removefeeder(c) != -1);
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if ((c->format & chn_getcaps(c)->formats) == c->format)
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return c->format;
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getspec(c->format, &s);
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if (s.bad) return -1;
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getspec(chn_getcaps(c)->bestfmt, &t);
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mask = (~cmpspec(&s, &t)) & 0x1f;
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iter = 0;
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do {
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if (mask == 0 || iter >= 8) break;
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chosen = -1;
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for (i = 0; i < FEEDERTABSZ && chosen == -1; i++) {
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e = &cvttab[i];
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if ((cmpspec(&s, &e->ispec) == 0x1f) &&
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((~cmpspec(&e->ispec, &e->ospec)) & mask))
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chosen = i;
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}
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if (chosen != -1) mask &= cvtapply(c, &cvttab[chosen], &s);
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iter++;
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} while (chosen != -1);
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return (iter < 8)? chn_getcaps(c)->bestfmt : -1;
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}
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static int
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chn_addfeeder(pcm_channel *c, pcm_feeder *f)
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{
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pcm_feeder *n;
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n = malloc(sizeof(pcm_feeder), M_DEVBUF, M_NOWAIT);
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*n = *f;
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n->source = c->feeder;
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c->feeder = n;
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if (n->init) n->init(n);
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return 0;
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}
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static int
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chn_removefeeder(pcm_channel *c)
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{
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pcm_feeder *f;
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if (c->feeder == &feeder_root) return -1;
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f = c->feeder->source;
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if (c->feeder->free) c->feeder->free(c->feeder);
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free(c->feeder, M_DEVBUF);
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c->feeder = f;
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return 0;
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}
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