/* * Copyright (c) 1999 Cameron Grant * 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. * * $FreeBSD$ */ #include static int chn_addfeeder(pcm_channel *c, pcm_feeder *f); static int chn_removefeeder(pcm_channel *c); #define FEEDBUFSZ 8192 static unsigned char ulaw_to_u8[] = { 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47, 51, 55, 59, 63, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 113, 114, 114, 115, 115, 116, 116, 117, 117, 118, 118, 119, 119, 120, 120, 121, 121, 121, 122, 122, 122, 122, 123, 123, 123, 123, 124, 124, 124, 124, 125, 125, 125, 125, 125, 125, 126, 126, 126, 126, 126, 126, 126, 126, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 253, 249, 245, 241, 237, 233, 229, 225, 221, 217, 213, 209, 205, 201, 197, 193, 190, 188, 186, 184, 182, 180, 178, 176, 174, 172, 170, 168, 166, 164, 162, 160, 158, 157, 156, 155, 154, 153, 152, 151, 150, 149, 148, 147, 146, 145, 144, 143, 143, 142, 142, 141, 141, 140, 140, 139, 139, 138, 138, 137, 137, 136, 136, 135, 135, 135, 134, 134, 134, 134, 133, 133, 133, 133, 132, 132, 132, 132, 131, 131, 131, 131, 131, 131, 130, 130, 130, 130, 130, 130, 130, 130, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, }; static unsigned char u8_to_ulaw[] = { 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 51, 53, 55, 57, 59, 61, 63, 66, 70, 74, 78, 84, 92, 104, 254, 231, 219, 211, 205, 201, 197, 193, 190, 188, 186, 184, 182, 180, 178, 176, 175, 174, 173, 172, 171, 170, 169, 168, 167, 166, 165, 164, 163, 162, 161, 160, 159, 159, 158, 158, 157, 157, 156, 156, 155, 155, 154, 154, 153, 153, 152, 152, 151, 151, 150, 150, 149, 149, 148, 148, 147, 147, 146, 146, 145, 145, 144, 144, 143, 143, 143, 143, 142, 142, 142, 142, 141, 141, 141, 141, 140, 140, 140, 140, 139, 139, 139, 139, 138, 138, 138, 138, 137, 137, 137, 137, 136, 136, 136, 136, 135, 135, 135, 135, 134, 134, 134, 134, 133, 133, 133, 133, 132, 132, 132, 132, 131, 131, 131, 131, 130, 130, 130, 130, 129, 129, 129, 129, 128, 128, 128, 128, }; /*****************************************************************************/ static int feed_root(pcm_feeder *feeder, pcm_channel *ch, u_int8_t *buffer, u_int32_t count, struct uio *stream) { int ret, c = 0, s; KASSERT(count, ("feed_root: count == 0")); count &= ~((1 << ch->align) - 1); KASSERT(count, ("feed_root: aligned count == 0")); s = spltty(); count = min(count, stream->uio_resid); if (count) { ret = uiomove(buffer, count, stream); KASSERT(ret == 0, ("feed_root: uiomove failed")); } splx(s); return c + count; } pcm_feeder feeder_root = { "root", 0, NULL, NULL, feed_root }; /*****************************************************************************/ static int feed_8to16(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { int i, j, k; k = f->source->feed(f->source, c, b, count / 2, stream); j = k - 1; i = j * 2 + 1; while (i > 0 && j >= 0) { b[i--] = b[j--]; b[i--] = 0; } return k * 2; } static pcm_feeder feeder_8to16 = { "8to16", 0, NULL, NULL, feed_8to16 }; /*****************************************************************************/ static int feed_16to8_init(pcm_feeder *f) { f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT); return (f->data == NULL); } static int feed_16to8_free(pcm_feeder *f) { if (f->data) free(f->data, M_DEVBUF); f->data = NULL; return 0; } static int feed_16to8le(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { u_int32_t i = 0, toget = count * 2; int j = 1, k; k = f->source->feed(f->source, c, f->data, min(toget, FEEDBUFSZ), stream); while (j < k) { b[i++] = ((u_int8_t *)f->data)[j]; j += 2; } return i; } static pcm_feeder feeder_16to8le = { "16to8le", 1, feed_16to8_init, feed_16to8_free, feed_16to8le }; /*****************************************************************************/ static int feed_monotostereo8(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { int i, j, k = f->source->feed(f->source, c, b, count / 2, stream); j = k - 1; i = j * 2 + 1; while (i > 0 && j >= 0) { b[i--] = b[j]; b[i--] = b[j]; j--; } return k * 2; } static pcm_feeder feeder_monotostereo8 = { "monotostereo8", 0, NULL, NULL, feed_monotostereo8 }; /*****************************************************************************/ static int feed_stereotomono8_init(pcm_feeder *f) { f->data = malloc(FEEDBUFSZ, M_DEVBUF, M_NOWAIT); return (f->data == NULL); } static int feed_stereotomono8_free(pcm_feeder *f) { if (f->data) free(f->data, M_DEVBUF); f->data = NULL; return 0; } static int feed_stereotomono8(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { u_int32_t i = 0, toget = count * 2; int j = 0, k; k = f->source->feed(f->source, c, f->data, min(toget, FEEDBUFSZ), stream); while (j < k) { b[i++] = ((u_int8_t *)f->data)[j]; j += 2; } return i; } static pcm_feeder feeder_stereotomono8 = { "stereotomono8", 1, feed_stereotomono8_init, feed_stereotomono8_free, feed_stereotomono8 }; /*****************************************************************************/ static int feed_endian(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { u_int8_t t; int i = 0, j = f->source->feed(f->source, c, b, count, stream); while (i < j) { t = b[i]; b[i] = b[i + 1]; b[i + 1] = t; i += 2; } return i; } static pcm_feeder feeder_endian = { "endian", -1, NULL, NULL, feed_endian }; /*****************************************************************************/ static int feed_sign(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { int i = 0, j = f->source->feed(f->source, c, b, count, stream); int ssz = (int)f->data, ofs = ssz - 1; while (i < j) { b[i + ofs] ^= 0x80; i += ssz; } return i; } static pcm_feeder feeder_sign8 = { "sign8", 0, NULL, NULL, feed_sign, (void *)1 }; static pcm_feeder feeder_sign16 = { "sign16", -1, NULL, NULL, feed_sign, (void *)2 }; /*****************************************************************************/ static int feed_table(pcm_feeder *f, pcm_channel *c, u_int8_t *b, u_int32_t count, struct uio *stream) { int i = 0, j = f->source->feed(f->source, c, b, count, stream); while (i < j) { b[i] = ((u_int8_t *)f->data)[b[i]]; i++; } return i; } static pcm_feeder feeder_ulawtou8 = { "ulawtou8", 0, NULL, NULL, feed_table, ulaw_to_u8 }; static pcm_feeder feeder_u8toulaw = { "u8toulaw", 0, NULL, NULL, feed_table, u8_to_ulaw }; /*****************************************************************************/ struct fmtspec { int stereo; int sign; int bit16; int bigendian; int ulaw; int bad; }; struct fmtcvt { pcm_feeder *f; struct fmtspec ispec, ospec; }; struct fmtcvt cvttab[] = { {&feeder_ulawtou8, {-1, 0, 0, 0, 1}, {-1, 0, 0, 0, 0}}, {&feeder_u8toulaw, {-1, 0, 0, 0, 0}, {-1, 0, 0, 0, 1}}, {&feeder_sign8, {-1, 0, 0, 0, 0}, {-1, 1, 0, 0, 0}}, {&feeder_sign8, {-1, 1, 0, 0, 0}, {-1, 0, 0, 0, 0}}, {&feeder_monotostereo8, { 0, -1, 0, 0, -1}, { 1, -1, 0, 0, -1}}, {&feeder_stereotomono8, { 1, -1, 0, 0, -1}, { 0, -1, 0, 0, -1}}, {&feeder_sign16, {-1, 0, 1, 0, 0}, {-1, 1, 1, 0, 0}}, {&feeder_sign16, {-1, 1, 1, 0, 0}, {-1, 0, 1, 0, 0}}, {&feeder_8to16, {-1, -1, 0, 0, 0}, {-1, -1, 1, 0, 0}}, {&feeder_16to8le, {-1, -1, 1, 0, 0}, {-1, -1, 0, 0, 0}}, {&feeder_endian, {-1, -1, 1, 0, 0}, {-1, -1, 1, 1, 0}}, {&feeder_endian, {-1, -1, 1, 1, 0}, {-1, -1, 1, 0, 0}}, }; #define FEEDERTABSZ (sizeof(cvttab) / sizeof(struct fmtcvt)) static int getspec(u_int32_t fmt, struct fmtspec *spec) { spec->stereo = (fmt & AFMT_STEREO)? 1 : 0; spec->sign = (fmt & AFMT_SIGNED)? 1 : 0; spec->bit16 = (fmt & AFMT_16BIT)? 1 : 0; spec->bigendian = (fmt & AFMT_BIGENDIAN)? 1 : 0; spec->ulaw = (fmt & AFMT_MU_LAW)? 1 : 0; spec->bad = (fmt & (AFMT_A_LAW | AFMT_MPEG))? 1 : 0; return 0; } static int cmp(int x, int y) { return (x == -1 || x == y || y == -1)? 1 : 0; } static int cmpspec(struct fmtspec *x, struct fmtspec *y) { int i = 0; if (cmp(x->stereo, y->stereo)) i |= 0x01; if (cmp(x->sign, y->sign)) i |= 0x02; if (cmp(x->bit16, y->bit16)) i |= 0x04; if (cmp(x->bigendian, y->bigendian)) i |= 0x08; if (cmp(x->ulaw, y->ulaw)) i |= 0x10; return i; } static int cvtapply(pcm_channel *c, struct fmtcvt *cvt, struct fmtspec *s) { int i = cmpspec(s, &cvt->ospec); chn_addfeeder(c, cvt->f); if (cvt->ospec.stereo != -1) s->stereo = cvt->ospec.stereo; if (cvt->ospec.sign != -1) s->sign = cvt->ospec.sign; if (cvt->ospec.bit16 != -1) s->bit16 = cvt->ospec.bit16; if (cvt->ospec.bigendian != -1) s->bigendian = cvt->ospec.bigendian; if (cvt->ospec.ulaw != -1) s->ulaw = cvt->ospec.ulaw; return i; } int chn_feedchain(pcm_channel *c) { int i, chosen, iter; u_int32_t mask; struct fmtspec s, t; struct fmtcvt *e; while (chn_removefeeder(c) != -1); c->align = 0; if ((c->format & chn_getcaps(c)->formats) == c->format) return c->format; getspec(c->format, &s); if (s.bad) return -1; getspec(chn_getcaps(c)->bestfmt, &t); mask = (~cmpspec(&s, &t)) & 0x1f; iter = 0; do { if (mask == 0 || iter >= 8) break; chosen = -1; for (i = 0; i < FEEDERTABSZ && chosen == -1; i++) { e = &cvttab[i]; if ((cmpspec(&s, &e->ispec) == 0x1f) && ((~cmpspec(&e->ispec, &e->ospec)) & mask)) chosen = i; } if (chosen != -1) mask &= cvtapply(c, &cvttab[chosen], &s); iter++; } while (chosen != -1); return (iter < 8)? chn_getcaps(c)->bestfmt : -1; } static int chn_addfeeder(pcm_channel *c, pcm_feeder *f) { pcm_feeder *n; n = malloc(sizeof(pcm_feeder), M_DEVBUF, M_NOWAIT); *n = *f; n->source = c->feeder; c->feeder = n; if (n->init) n->init(n); if (n->align > 0) c->align += n->align; else if (n->align < 0 && c->align < -n->align) c->align -= n->align; return 0; } static int chn_removefeeder(pcm_channel *c) { pcm_feeder *f; if (c->feeder == &feeder_root) return -1; f = c->feeder->source; if (c->feeder->free) c->feeder->free(c->feeder); free(c->feeder, M_DEVBUF); c->feeder = f; return 0; }