b5a6517e9d
Replace with rbcodecconfig.h and platform.h includes. Remove now- unneeded ones as well. Change-Id: I6111b71e90bf86d9fe272a7916f2d34a5c6dd724
904 lines
42 KiB
ArmAsm
904 lines
42 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 Thom Johansen
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* Copyright (C) 2007, 2012 Michael Sevakis
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* Copyright (C) 2010 Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "rbcodecconfig.h"
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/****************************************************************************
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* void pga_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p)
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*/
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.section .text
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.align 2
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.global pga_process
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pga_process:
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| input: 4(sp) = this, 8(sp) = buf_p
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movem.l 4(%sp), %a0-%a1 | %a0 = this, %a1 = buf_p
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move.l (%a0), %a0 | %a0 = this->data = &pga_data
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move.l (%a0), %a0 | %a0 = data->gain
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move.l (%a1), %a1 | %a1 = buf = *buf_p
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lea.l -20(%sp), %sp | save registers
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movem.l %d2-%d4/%a2-%a3, (%sp) |
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clr.l %d1 | %d1 = buf->format.num_channels
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move.b 17(%a1), %d1 |
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10: | channel loop |
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move.l (%a1), %d0 | %d0 = buf->remcount
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move.l (%a1, %d1.l*4), %a2 | %a2 = s = buf->p32[ch-1]
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move.l %a2, %a3 | %a3 = d = s
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move.l (%a2)+, %d2 | %d2 = *s++,
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mac.l %a0, %d2, (%a2)+, %d2, %acc0 | %acc0 = S(n)*gain, load S(n+1)
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subq.l #1, %d0 | --count > 0 ? : effectively n++
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ble.b 30f | loop done | no? finish up
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20: | loop |
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move.l %accext01, %d4 | fetch S(n-1)[7:0]
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movclr.l %acc0, %d3 | fetch S(n-1)[40:8] in %d5[31:0]
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asl.l #8, %d3 | *s++ = (S(n-1)[40:8] << 8) | S(n-1)[7:0]
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mac.l %a0, %d2, (%a2)+, %d2, %acc0 | %acc0 = S(n)*gain, load S(n+1)
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move.b %d4, %d3 |
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move.l %d3, (%a3)+ |
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subq.l #1, %d0 | --count > 0 ? : effectively n++
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bgt.b 20b | loop | yes? do more samples
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30: | loop done |
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move.l %accext01, %d4 | fetch S(n-1)[7:0]
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movclr.l %acc0, %d3 | fetch S(n-1)[40:8] in %d5[31:0]
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asl.l #8, %d3 | *s = (S(n-1)[40:8] << 8) | S(n-1)[7:0]
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move.b %d4, %d3 |
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move.l %d3, (%a3) |
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subq.l #1, %d1 | next channel
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bgt.b 10b | channel loop |
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movem.l (%sp), %d2-%d4/%a2-%a3 | restore registers
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lea.l 20(%sp), %sp | cleanup stack
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rts |
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.size pga_process, .-pga_process
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/****************************************************************************
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* void crossfeed_process(struct dsp_proc_entry *this,
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* struct dsp_buffer **buf_p)
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*/
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.section .text
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.align 2
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.global crossfeed_process
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crossfeed_process:
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| input: 4(sp) = this, 8(sp) = buf_p
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lea.l -44(%sp), %sp |
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movem.l %d2-%d7/%a2-%a6, (%sp) | save all regs
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movem.l 48(%sp), %a1/%a4 | %a1 = this, %a4 = buf_p
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move.l (%a4), %a4 | %a4 = buf = *buf_p
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movem.l (%a4), %d7/%a4-%a5 | %d7 = buf->remcount, %a4 = buf->p32[0],
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| %a5 = buf->p32[1]
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move.l (%a1), %a1 | %a1 = &crossfeed_state
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move.l (%a1)+, %d6 | %d6 = direct gain
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movem.l 12(%a1), %d0-%d3 | fetch filter history samples
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lea.l 132(%a1), %a6 | %a6 = delay line wrap limit
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move.l (%a6), %a0 | fetch delay line address
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movem.l (%a1), %a1-%a3 | load filter coefs
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bra.b 20f | loop start | go to loop start point
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/* Register usage in loop:
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* %a0 = delay_p, %a1..%a3 = b0, b1, a1 (filter coefs),
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* %a4 = buf[0], %a5 = buf[1],
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* %a6 = delay line pointer wrap limit,
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* %d0..%d3 = history
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* %d4..%d5 = temp.
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* %d6 = direct gain,
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* %d7 = count
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*/
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10: | loop |
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movclr.l %acc0, %d4 | write outputs
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move.l %d4, (%a4)+ | .
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movclr.l %acc1, %d5 | .
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move.l %d5, (%a5)+ | .
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20: | loop start |
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mac.l %a2, %d0, (%a0)+, %d0, %acc0 | %acc0 = b1*dl[n - 1], %d0 = dl[n]
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mac.l %a1, %d0 , %acc0 | %acc0 += b0*dl[n]
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mac.l %a3, %d1, (%a5), %d5, %acc0 | %acc0 += a1*y_r[n - 1], load R
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mac.l %a2, %d2, (%a0)+, %d2, %acc1 | %acc1 = b1*dr[n - 1], %d2 = dr[n]
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mac.l %a1, %d2 , %acc1 | %acc1 += b0*dr[n]
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mac.l %a3, %d3, (%a4), %d4, %acc1 | %acc1 += a1*y_l[n - 1], load L
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movem.l %d4-%d5, -8(%a0) | save left & right inputs to delay line
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move.l %acc0, %d3 | get filtered delayed left sample (y_l[n])
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move.l %acc1, %d1 | get filtered delayed right sample (y_r[n])
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mac.l %d6, %d4, %acc0 | %acc0 += gain*x_l[n]
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mac.l %d6, %d5, %acc1 | %acc1 += gain*x_r[n]
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cmp.l %a6, %a0 | wrap %a0 if passed end
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bhs.b 30f | wrap buffer |
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tpf.l | trap the buffer wrap
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30: | wrap buffer | ...fwd taken branches more costly
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lea.l -104(%a6), %a0 | wrap it up
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subq.l #1, %d7 | --count > 0 ?
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bgt.b 10b | loop | yes? do more
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movclr.l %acc0, %d4 | write last outputs
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move.l %d4, (%a4) | .
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movclr.l %acc1, %d5 | .
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move.l %d5, (%a5) | .
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movem.l %d0-%d3, -120(%a6) | ...history
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move.l %a0, (%a6) | ...delay_p
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movem.l (%sp), %d2-%d7/%a2-%a6 | restore all regs
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lea.l 44(%sp), %sp |
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rts |
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.size crossfeed_process,.-crossfeed_process
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/****************************************************************************
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* void crossfeed_meier_process(struct dsp_proc_entry *this,
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* struct dsp_buffer **buf_p)
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*/
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.section .text
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.global crossfeed_meier_process
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crossfeed_meier_process:
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| input: 4(sp) = this, 8(sp) = buf_p
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movem.l 4(%sp), %a0-%a1 | %a0 = this, %a1 = buf_p
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lea.l -24(%sp), %sp | save non-volatiles
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movem.l %d2-%d6/%a2, (%sp) | .
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move.l (%a0), %a0 | %a0 = &this->data = &crossfeed_state
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move.l (%a1), %a1 | %a1 = buf = *buf_p
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movem.l 16(%a0), %d1-%d5 | %d1 = vcl, %d2 = vcr, %d3 = vdiff,
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| %d4 = coef1, %d5 = coef2
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movem.l (%a1), %d0/%a1-%a2 | %d0 = count = buf->remcount
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| %a1 = p32[0], %a2 = p32[1]
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| Register usage in loop:
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| %d0 = count, %d1 = vcl, %d2 = vcr, %d3 = vdiff/lout,
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| %d4 = coef1, %d5 = coef2, %d6 = rout/scratch
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| %a1 = p32[0], %a2 = p32[1]
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10: | loop
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mac.l %d5, %d3, %acc0 | %acc0 = common = coef2*vdiff
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move.l %acc0, %acc1 | copy common
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mac.l %d4, %d1, (%a1), %d3, %acc0 | %acc0 += coef1*vcl, %d3 = lout
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msac.l %d4, %d2, (%a2), %d6, %acc1 | %acc1 -= coef1*vcr, %d6 = rout
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add.l %d1, %d3 | lout += vcl
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add.l %d2, %d6 | rout += vcr
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move.l %d3, (%a1)+ | store left channel, pos inc
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move.l %d6, (%a2)+ | store right channel, pos inc
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sub.l %d6, %d3 | vdiff = lout - rout
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movclr.l %acc0, %d6 | %d4 = fetch res1 in s0.31
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sub.l %d6, %d1 | vcl -= res1
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movclr.l %acc1, %d6 | %d5 = fetch -res2 in s0.31
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add.l %d6, %d2 | vcr += -res2
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subq.l #1, %d0 | count--
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bgt 10b | loop | more samples?
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movem.l %d1-%d3, 16(%a0) | save vcl, vcr, vdiff
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movem.l (%sp), %d2-%d6/%a2 | restore non-volatiles
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lea.l 24(%sp), %sp | .
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rts |
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.size crossfeed_meier_process, .-crossfeed_meier_process
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/****************************************************************************
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* int resample_hermite(struct resample_data *data, struct dsp_buffer *src,
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* struct dsp_buffer *dst)
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*/
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.section .text
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.align 2
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.global resample_hermite
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resample_hermite:
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| input: 4(sp) = data, 8(sp) = src, 12(sp) = dst
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lea.l -52(%sp), %sp | save non-volatiles, allocate temps
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movem.l %d2-%d7/%a2-%a6, 8(%sp) |
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movem.l 56(%sp), %a0-%a2 | %a0 = data
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| %a1 = src
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| %a2 = dst
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clr.l %d5 | %d5 = ch = src->format.num_channels
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move.b 17(%a1), %d5 |
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lea.l 8(%a0), %a5 | %a5 = h = history[ch]
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moveq.l #16, %d7 | %d7 = shift val
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.hrs_channel_loop: |
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movem.l %d5/%a5, (%sp) | store ch, h
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movem.l (%a0), %d1-%d2 | %d1 = delta = data->delta,
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| %d2 = phase = data->phase
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move.l (%a1), %d3 | %d3 = srcrem = src->remcount
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move.l 12(%a2), %d4 | %d4 = dstrem = dst->bufcount
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cmp.l #0x8000, %d3 | %d4 = MIN(srcrem, 0x8000)
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ble.b 1f |
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move.l #0x8000, %d3 |
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1: |
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move.l (%a1, %d5.l*4), %a1 | %a1 = s = src->p32[ch]
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move.l (%a2, %d5.l*4), %a2 | %a2 = d = dst->p32[ch]
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move.l %d2, %d0 | %d0 = pos = phase >> 16
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lsr.l %d7, %d0 |
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cmp.l %d3, %d0 | pos = MIN(pos, srcrem)
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ble.b 1f |
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move.l %d3, %d0 |
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1:
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lea.l (%a1, %d0.l*4), %a1 | %a1 = &s[pos]
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cmp.l #3, %d0 |
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bge.b 1f |
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move.l %d0, %a0 |
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lea.l (%a0, %a0.l*2), %a0 |
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jmp 2(%pc, %a0.l*4) | 4b |
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| 0
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movem.l (%a5), %a3-%a5 | 4b | x3..x1 = h[0]..h[2]
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bra.b 2f | 2b |
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.dcb.w 3,0 | 6b | filler
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| 1
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movem.l 4(%a5), %a3-%a4 | 6b | x3..x2 = h[1]..h[2]
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move.l -4(%a1), %a5 | 4b | x1 = s[0]
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bra.b 2f | 2b |
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| 2
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move.l 8(%a5), %a3 | 4b | x3 = h[2]
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movem.l -8(%a1), %a4-%a5 | 6b | x2..x1 = s[0]..s[1]
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bra.b 2f | 2b |
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1: | 3 +
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movem.l -12(%a1), %a3-%a5 | x3...x1 = s[pos-3]..s[pos-1]
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2:
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cmp.l %d3, %d0 | pos past end?
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bge.w .hrs_channel_done |
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cmp.l #0x10000, %d1 | delta >= 1.0?
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bhs.w .hrs_dsstart | yes? downsampling
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/** Upsampling **/ |
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sub.l %d3, %d0 | %d0 = pos - srcrem = -dte
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lsl.l %d7, %d1 | move delta to bits 30..15
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lsr.l #1, %d1 |
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lsl.l %d7, %d2 | move phase to bits 30..15
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lsr.l #1, %d2 |
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| Register usage in loop:
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| r0 = dte, d1 = delta, d2 = phase, d3 = srcrem, d4 = dstrem
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| d5 = scratch, d6 = c3, d7 = scratch
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| a0 = c2, a1 = &s[pos], a2 = d,
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| a3 = x3, a4 = x2, a5 = x1, a6 = x0
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| Try to avoid overflow as much as possible and at the same time preserve
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| accuracy. Same formulas apply to downsampling but registers and
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| instruction order differ due to specific constraints.
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| c1 = -0.5*x3 + 0.5*x1
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| = 0.5*(x1 - x3) <--
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| v = x1 - x2, -v = x2 - x1
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| c2 = x3 - 2.5*x2 + 2*x1 - 0.5*x0
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| = x3 + 2*(x1 - x2) - 0.5*(x0 + x2)
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| = x3 + 2*v - 0.5*(x0 + x2) <--
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| c3 = -0.5*x3 + 1.5*x2 - 1.5*x1 + 0.5*x0
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| = 0.5*x0 - 0.5*x3 + 0.5*(x2 - x1) + (x2 - x1)
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| = 0.5*(x0 - x3 - v) - v <--
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.hrs_usloop_carry:
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move.l (%a1)+, %a6 | %a6 = s[pos]
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move.l %a5, %d5 | v
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sub.l %a4, %d5 |
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move.l %a6, %d6 | c3
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sub.l %a3, %d6 |
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sub.l %d5, %d6 |
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asr.l #1, %d6 |
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sub.l %d5, %d6 |
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lea.l (%a3, %d5.l*2), %a0 | c2
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move.l %a6, %d5 |
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add.l %a4, %d5 |
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asr.l #1, %d5 |
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sub.l %d5, %a0 |
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.hrs_usloop_frac:
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move.l %a0, %acc0 | %acc0 = frac * c3 + c2
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mac.l %d2, %d6, %acc0 |
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move.l %a5, %d5 | c1
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sub.l %a3, %d5 |
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asr.l #1, %d5 |
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movclr.l %acc0, %d7 | %acc1 = frac * acc + c1
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move.l %d5, %acc1 |
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mac.l %d2, %d7, %acc1 |
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move.l %a4, %acc0 | %acc0 = frac * acc + x2
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movclr.l %acc1, %d5 |
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mac.l %d2, %d5, %acc0 |
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subq.l #1, %d4 | dstrem <= 0?
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ble.b .hrs_usfull | yes? stop
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movclr.l %acc0, %d5 | *d++ = d5 = result
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move.l %d5, (%a2)+ |
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add.l %d1, %d2 | phase += delta
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bpl.b .hrs_usloop_frac | load next values?
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move.l %a4, %a3 | x3 = x2
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move.l %a5, %a4 | x2 = x1
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move.l %a6, %a5 | x1 = x0
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bclr.l #31, %d2 | clear sign bit
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addq.l #1, %d0 | dte > 0?
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bmi.b .hrs_usloop_carry | yes? continue resampling
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bra.b .hrs_usdone
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.hrs_usfull:
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movclr.l %acc0, %d5 | *d++ = d5 = result
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move.l %d5, (%a2) |
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add.l %d1, %d2 | do missed phase increment
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bpl.b .hrs_usdone | was sign bit set?
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move.l %a4, %a3 | do missed history update
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move.l %a5, %a4 |
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move.l %a6, %a5 |
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addq.l #1, %d0 | do missed dte decrement
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.hrs_usdone:
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moveq.l #16, %d7 | restore shift
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lsl.l #1, %d2 | frac -> phase
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add.l %d3, %d0 | %d0 = -dte + srcrem = pos
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or.l %d0, %d2 | restore phase
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swap.w %d2 |
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bra.w .hrs_channel_done |
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/** Downsampling **/
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| Register usage in loop:
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| r0 = pos, d1 = delta, d2 = phase, d3 = srcrem, d4 = dstrem
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| d5 = scratch, d6 = scratch, d7 = 16 (shift value)
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| a0 = scratch, a1 = &s[pos], a2 = d,
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| a3 = x3, a4 = x2, a5 = x1, a6 = x0
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.hrs_dsloop:
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movclr.l %acc0, %d5 | *d++ = acc
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move.l %d5, (%a2)+ |
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sub.l %d0, %a0 | %a0 = -shift = last_pos - pos
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move.l %a0, %d5 |
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asl.l #2, %d5 | -shift -> -bytes
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sub.l %d5, %a1 | %a1 = s = s - -bytes
|
|
cmp.l #-4, %a0 | >= 4?
|
|
ble.b 1f |
|
|
add.l %d5, %a0 | %a0 = 5 * -shift
|
|
jmp 40(%pc, %a0.l*2) | 4b |
|
|
1: | +4 +
|
|
movem.l -12(%a1), %a3-%a5 | 6b | x3..x0 = s[pos-3]..s[pos-1]
|
|
bra.b 1f | 2b |
|
|
| +3
|
|
move.l %a6, %a3 | 2b | x3 = x0
|
|
movem.l -8(%a1), %a4-%a5 | 6b | x2..x0 = s[pos-2]..s[pos-1]
|
|
bra.b 1f | 2b | 10
|
|
| +2
|
|
move.l %a5, %a3 | 2b | x3 = x1
|
|
move.l %a6, %a4 | 2b | x2 = x0
|
|
move.l -4(%a1), %a5 | 4b | x1 = s[pos-1]
|
|
bra.b 1f | 2b | 10
|
|
| +1
|
|
move.l %a4, %a3 | 2b | x3 = x2 | expected loop destination
|
|
move.l %a5, %a4 | 2b | x2 = x1
|
|
move.l %a6, %a5 | 2b | x1 = x0
|
|
1:
|
|
|
|
subq.l #1, %d4 | 2b | dstrem <= 0?
|
|
ble.b .hrs_channel_done | 2b | yes? stop
|
|
cmp.l %d3, %d0 |
|
|
bge.b .hrs_channel_done |
|
|
|
|
.hrs_dsstart:
|
|
move.l (%a1), %a6 | %a6 = s[pos]
|
|
move.l %a5, %d5 | v
|
|
sub.l %a4, %d5 |
|
|
|
|
move.l %a6, %d6 | c3
|
|
sub.l %a3, %d6 |
|
|
sub.l %d5, %d6 |
|
|
asr.l #1, %d6 |
|
|
sub.l %d5, %d6 |
|
|
|
|
lea.l (%a3, %d5.l*2), %a0 | c2
|
|
move.l %a6, %d5 |
|
|
add.l %a4, %d5 |
|
|
asr.l #1, %d5 |
|
|
sub.l %d5, %a0 |
|
|
|
|
move.l %d2, %d5 | phase -> frac
|
|
lsl.l %d7, %d5 |
|
|
lsr.l #1, %d5 |
|
|
|
|
move.l %a0, %acc0 | %acc0 = frac * c3 + c2
|
|
mac.l %d5, %d6, %acc0 |
|
|
|
|
move.l %a5, %d6 | c1
|
|
sub.l %a3, %d6 |
|
|
asr.l #1, %d6 |
|
|
|
|
movclr.l %acc0, %a0 | %acc1 = frac * acc + c1
|
|
move.l %d6, %acc1 |
|
|
mac.l %d5, %a0, %acc1 |
|
|
|
|
move.l %d0, %a0 | %a0 = last_pos
|
|
add.l %d1, %d2 | phase += delta
|
|
move.l %d2, %d0 | pos = phase >> 16
|
|
lsr.l %d7, %d0 |
|
|
|
|
movclr.l %acc1, %d6 | %acc0 = frac * acc + x2
|
|
move.l %a4, %acc0 |
|
|
mac.l %d5, %d6, %acc0 |
|
|
|
|
cmp.l %d3, %d0 | %d0 = MIN(pos, srcrem)
|
|
ble.w .hrs_dsloop |
|
|
move.l %d3, %d0 |
|
|
bra.w .hrs_dsloop |
|
|
|
|
.hrs_channel_done: |
|
|
movem.l (%sp), %d5/%a0 | restore ch, h
|
|
movem.l %a3-%a5, (%a0) | h[0..2] = x3..x1
|
|
lea.l 12(%a0), %a5 | h++
|
|
movem.l 56(%sp), %a0-%a2 | load data, src, dst
|
|
subq.l #1, %d5 | ch > 0?
|
|
bgt.w .hrs_channel_loop | yes? process next channel
|
|
|
|
move.l 12(%a2), %d1 | %d1 = dst->bufcount
|
|
sub.l %d4, %d1 | written = dst->bufcount - dstrem
|
|
move.l %d1, (%a2) | dst->remcount = written
|
|
move.l %d0, %d1 | wrap phase to position in next frame
|
|
lsl.l %d7, %d1 | data->phase = phase - (pos << 16)
|
|
sub.l %d1, %d2 |
|
|
move.l %d2, 4(%a0) |
|
|
movem.l 8(%sp), %d2-%d7/%a2-%a6 | restore non-volatiles
|
|
lea.l 52(%sp), %sp | cleanup stack
|
|
rts | buh-bye
|
|
|
|
.size resample_hermite, .-resample_hermite
|
|
|
|
/****************************************************************************
|
|
* void channel_mode_proc_mono(struct dsp_proc_entry *this,
|
|
* struct dsp_buffer **buf_p)
|
|
*
|
|
* Mix left and right channels 50/50 into a center channel.
|
|
*/
|
|
.section .text
|
|
.align 2
|
|
.global channel_mode_proc_mono
|
|
channel_mode_proc_mono:
|
|
| input: 4(sp) = this, 8(sp) = buf_p
|
|
move.l 8(%sp), %a0 | %a0 = buf_p
|
|
move.l (%a0), %a0 | %a0 = buf = *buf_p
|
|
lea.l -20(%sp), %sp | save registers
|
|
movem.l %d2-%d4/%a2-%a3, (%sp) |
|
|
movem.l (%a0), %d0/%a0-%a1 | %d0 = buf->remcount, %a0 = buf->p32[0],
|
|
| %a1 = buf->p32[1]
|
|
move.l %a0, %a2 | use separate dst pointers since read
|
|
move.l %a1, %a3 | pointers run one ahead of write
|
|
move.l #0x40000000, %d3 | %d3 = 0.5
|
|
move.l (%a0)+, %d1 | prime the input registers
|
|
move.l (%a1)+, %d2 |
|
|
mac.l %d1, %d3, (%a0)+, %d1, %acc0 |
|
|
mac.l %d2, %d3, (%a1)+, %d2, %acc0 |
|
|
subq.l #1, %d0 |
|
|
ble.s 20f | loop done |
|
|
10: | loop |
|
|
movclr.l %acc0, %d4 | L = R = l/2 + r/2
|
|
mac.l %d1, %d3, (%a0)+, %d1, %acc0 |
|
|
mac.l %d2, %d3, (%a1)+, %d2, %acc0 |
|
|
move.l %d4, (%a2)+ | output to original buffer
|
|
move.l %d4, (%a3)+ |
|
|
subq.l #1, %d0 |
|
|
bgt.s 10b | loop |
|
|
20: | loop done |
|
|
movclr.l %acc0, %d4 | output last sample
|
|
move.l %d4, (%a2) |
|
|
move.l %d4, (%a3) |
|
|
movem.l (%sp), %d2-%d4/%a2-%a3 | restore registers
|
|
lea.l 20(%sp), %sp | cleanup
|
|
rts |
|
|
.size channel_mode_proc_mono, .-channel_mode_proc_mono
|
|
|
|
/****************************************************************************
|
|
* void channel_mode_proc_custom(struct dsp_proc_entry *this,
|
|
* struct dsp_buffer **buf_p)
|
|
*
|
|
* Apply stereo width (narrowing/expanding) effect.
|
|
*/
|
|
.section .text
|
|
.align 2
|
|
.global channel_mode_proc_custom
|
|
channel_mode_proc_custom:
|
|
| input: 4(sp) = this, 8(sp) = buf_p
|
|
lea.l -28(%sp), %sp | save registers
|
|
movem.l %d2-%d6/%a2-%a3, (%sp) |
|
|
movem.l 32(%sp), %a0-%a1 | %a0 = this, %a1 = buf_p
|
|
move.l (%a1), %a1 | %a1 = buf = *buf_p
|
|
move.l (%a0), %a2 | %a2 = this->data = &channel_mode_data
|
|
movem.l (%a1), %d0/%a0-%a1 | %d0 = buf->remcount, %a0 = buf->p32[0],
|
|
| %a1 = buf->p32[1]
|
|
movem.l (%a2), %d3-%d4 | %d3 = sw_gain, %d4 = sw_cross
|
|
move.l %a0, %a2 | use separate dst pointers since read
|
|
move.l %a1, %a3 | pointers run one ahead of write
|
|
move.l (%a0)+, %d1 | prime the input registers
|
|
move.l (%a1)+, %d2 |
|
|
mac.l %d1, %d3 , %acc0 | L = l*gain + r*cross
|
|
mac.l %d1, %d4, (%a0)+, %d1, %acc1 | R = r*gain + l*cross
|
|
mac.l %d2, %d4 , %acc0 |
|
|
mac.l %d2, %d3, (%a1)+, %d2, %acc1 |
|
|
subq.l #1, %d0 |
|
|
ble.b 20f | loop done |
|
|
10: | loop |
|
|
movclr.l %acc0, %d5 |
|
|
movclr.l %acc1, %d6 |
|
|
mac.l %d1, %d3 , %acc0 | L = l*gain + r*cross
|
|
mac.l %d1, %d4, (%a0)+, %d1, %acc1 | R = r*gain + l*cross
|
|
mac.l %d2, %d4 , %acc0 |
|
|
mac.l %d2, %d3, (%a1)+, %d2, %acc1 |
|
|
move.l %d5, (%a2)+ |
|
|
move.l %d6, (%a3)+ |
|
|
subq.l #1, %d0 |
|
|
bgt.s 10b | loop |
|
|
20: | loop done |
|
|
movclr.l %acc0, %d5 | output last sample
|
|
movclr.l %acc1, %d6 |
|
|
move.l %d5, (%a2) |
|
|
move.l %d6, (%a3) |
|
|
movem.l (%sp), %d2-%d6/%a2-%a3 | restore registers
|
|
lea.l 28(%sp), %sp | cleanup
|
|
rts |
|
|
.size channel_mode_proc_custom, .-channel_mode_proc_custom
|
|
|
|
/****************************************************************************
|
|
* void channel_mode_proc_karaoke(struct dsp_proc_entry *this,
|
|
* struct dsp_buffer **buf_p)
|
|
*
|
|
* Separate channels into side channels.
|
|
*/
|
|
.section .text
|
|
.align 2
|
|
.global channel_mode_proc_karaoke
|
|
channel_mode_proc_karaoke:
|
|
| input: 4(sp) = this, 8(sp) = buf_p
|
|
move.l 8(%sp), %a0 | %a0 = buf_p
|
|
move.l (%a0), %a0 | %a0 = buf = *buf_p
|
|
lea.l -20(%sp), %sp | save registers
|
|
movem.l %d2-%d4/%a2-%a3, (%sp) |
|
|
movem.l (%a0), %d0/%a0-%a1 | %d0 = buf->remcount, %a0 = buf->p32[0],
|
|
| %a1 = buf->p32[1]
|
|
move.l %a0, %a2 | use separate dst pointers since read
|
|
move.l %a1, %a3 | pointers run one ahead of write
|
|
move.l #0x40000000, %d3 | %d3 = 0.5
|
|
move.l (%a0)+, %d1 | prime the input registers
|
|
move.l (%a1)+, %d2 |
|
|
mac.l %d1, %d3, (%a0)+, %d1, %acc0 | L = l/2 - r/2
|
|
msac.l %d2, %d3, (%a1)+, %d2, %acc0 |
|
|
subq.l #1, %d0 |
|
|
ble.b 20f | loop done |
|
|
10: | loop |
|
|
movclr.l %acc0, %d4 |
|
|
mac.l %d1, %d3, (%a0)+, %d1, %acc0 | L = l/2 - r/2
|
|
msac.l %d2, %d3, (%a1)+, %d2, %acc0 |
|
|
move.l %d4, (%a2)+ |
|
|
neg.l %d4 | R = -L = -(l/2 - r/2) = r/2 - l/2
|
|
move.l %d4, (%a3)+ |
|
|
subq.l #1, %d0 |
|
|
bgt.s 10b | loop |
|
|
20: | loop done |
|
|
movclr.l %acc0, %d4 | output last sample
|
|
move.l %d4, (%a2) |
|
|
neg.l %d4 | R = -L = -(l/2 - r/2) = r/2 - l/2
|
|
move.l %d4, (%a3) |
|
|
movem.l (%sp), %d2-%d4/%a2-%a3 | restore registers
|
|
lea.l 20(%sp), %sp | cleanup
|
|
rts |
|
|
.size channel_mode_proc_karaoke, .-channel_mode_proc_karaoke
|
|
|
|
/****************************************************************************
|
|
* void filter_process(struct dsp_filter *f, int32_t *buf[], int count,
|
|
* unsigned int channels)
|
|
*
|
|
* define HIGH_PRECISION as '1' to make filtering calculate lower bits after
|
|
* shifting. without this, "shift" - 1 of the lower bits will be lost here.
|
|
*/
|
|
#define HIGH_PRECISION 0
|
|
.text
|
|
.global filter_process
|
|
filter_process:
|
|
| input: 4(sp) = f, 8(sp) = buf, 12(sp) = count, 16(sp) = channels
|
|
lea.l -44(%sp), %sp | save clobbered regs
|
|
#if HIGH_PRECISION
|
|
movem.l %d2-%d7/%a2-%a6, (%sp) | .
|
|
#else
|
|
movem.l %d2-%d6/%a2-%a6, (%sp) |
|
|
#endif
|
|
move.l 48(%sp), %a5 | fetch filter structure address
|
|
clr.l %d6 | load shift count
|
|
move.b 52(%a5), %d6 | .
|
|
subq.l #1, %d6 | EMAC gives us one free shift
|
|
#if HIGH_PRECISION
|
|
moveq.l #8, %d7
|
|
sub.l %d6, %d7 | shift for lower part of accumulator
|
|
#endif
|
|
movem.l (%a5), %a0-%a4 | load coefs
|
|
lea.l 20(%a5), %a5 | point to filter history
|
|
|
|
10: | channel loop
|
|
move.l 52(%sp), %a6 | load input channel pointer
|
|
addq.l #4, 52(%sp) | point x to next channel
|
|
move.l (%a6), %a6 |
|
|
move.l 56(%sp), %d5 | number of samples
|
|
movem.l (%a5), %d0-%d3 | load filter history
|
|
|
|
| d0-d3 = history, d4 = temp, d5 = sample count, d6 = upper shift amount,
|
|
| d7 = lower shift amount,a0-a4 = coefs, a5 = history pointer, a6 = buf[ch]
|
|
20: | loop
|
|
| Direct form 1 filtering code. We assume DSP has put EMAC in frac mode.
|
|
| y[n] = b0*x[i] + b1*x[i - 1] + b2*x[i - 2] + a1*y[i - 1] + a2*y[i - 2],
|
|
| where y[] is output and x[] is input. This is performed out of order
|
|
| to do parallel load of input value.
|
|
mac.l %a2, %d1, %acc0 | acc = b2*x[i - 2]
|
|
move.l %d0, %d1 | fix input history
|
|
mac.l %a1, %d0, (%a6), %d0, %acc0 | acc += b1*x[i - 1], x[i] -> d0
|
|
mac.l %a0, %d0, %acc0 | acc += b0*x[i]
|
|
mac.l %a3, %d2, %acc0 | acc += a1*y[i - 1]
|
|
mac.l %a4, %d3, %acc0 | acc += a2*y[i - 2]
|
|
move.l %d2, %d3 | fix output history
|
|
#if HIGH_PRECISION
|
|
move.l %accext01, %d2 | fetch lower part of accumulator
|
|
move.b %d2, %d4 | clear upper three bytes
|
|
lsr.l %d7, %d4 | shift lower bits
|
|
#endif
|
|
movclr.l %acc0, %d2 | fetch upper part of result
|
|
asl.l %d6, %d2 | restore fixed point format
|
|
#if HIGH_PRECISION
|
|
or.l %d2, %d4 | combine lower and upper parts
|
|
#endif
|
|
move.l %d2, (%a6)+ | save result
|
|
subq.l #1, %d5 | are we done with this channel?
|
|
bgt 20b | loop
|
|
|
|
movem.l %d0-%d3, (%a5) | save history back to struct
|
|
lea.l 16(%a5), %a5 | point to next channel's history
|
|
subq.l #1, 60(%sp) | have we processed both channels?
|
|
bhi 10b | channel loop
|
|
|
|
#if HIGH_PRECISION
|
|
movem.l (%sp), %d2-%d7/%a2-%a6
|
|
#else
|
|
movem.l (%sp), %d2-%d6/%a2-%a6
|
|
#endif
|
|
lea.l 44(%sp), %sp
|
|
rts
|
|
.size filter_process, .-filter_process
|
|
|
|
/****************************************************************************
|
|
* void sample_output_stereo(struct sample_io_data *this,
|
|
* struct dsp_buffer *src,
|
|
* struct dsp_buffer *dst)
|
|
*
|
|
* Framework based on the ubiquitous Rockbox line transfer logic for
|
|
* Coldfire CPUs.
|
|
*
|
|
* Does emac clamping and scaling (which proved faster than the usual
|
|
* checks and branches - even single test clamping) and writes using
|
|
* line burst transfers. Also better than writing a single L-R pair per
|
|
* loop but a good deal more code.
|
|
*
|
|
* Attemping bursting during reads is rather futile since the source and
|
|
* destination alignments rarely agree and too much complication will
|
|
* slow us up. The parallel loads seem to do a bit better at least until
|
|
* a pcm buffer can always give line aligned chunk and then aligning the
|
|
* dest can then imply the source is aligned if the source buffers are.
|
|
* For now longword alignment is assumed of both the source and dest.
|
|
*
|
|
*/
|
|
.section .text
|
|
.align 2
|
|
.global sample_output_stereo
|
|
sample_output_stereo:
|
|
| input: 4(sp) = count, 8(sp) = src, 12(sp) = dst
|
|
lea.l -48(%sp), %sp | save registers
|
|
move.l %macsr, %d1 | do it now as at many lines will
|
|
movem.l %d1-%d7/%a2-%a6, (%sp) | be the far more common condition
|
|
move.l #0x80, %macsr | put emac unit in signed int mode
|
|
movem.l 52(%sp), %a0-%a2 | %a0 = this, %a1 = src, %a2 = dst
|
|
move.l (%a0), %a0 | %a0 = this->outcount
|
|
move.l 4(%a2), %a4 | %a4 = dst->p16out
|
|
lea.l (%a4, %a0.l*4), %a0 | %a0 = count -> end address
|
|
movem.l 4(%a1), %a2-%a3 | %a2 = src->p32[0], %a3 = src->p32[1]
|
|
clr.l %d1 | %a1 = multiplier: (1 << (16 - scale))
|
|
move.b 19(%a1), %d1 | %d1 = src->format.output_scale
|
|
sub.l #16, %d1 |
|
|
neg.l %d1 |
|
|
moveq.l #1, %d0 |
|
|
asl.l %d1, %d0 |
|
|
move.l %d0, %a1 |
|
|
move.l #0x8000, %a6 | %a6 = rounding term
|
|
moveq.l #28, %d0 | %d0 = second line bound
|
|
add.l %a4, %d0 |
|
|
and.l #0xfffffff0, %d0 |
|
|
cmp.l %a0, %d0 | at least a full line?
|
|
bhi.w 40f | long loop 1 start | no? do as trailing longwords
|
|
sub.l #16, %d0 | %d1 = first line bound
|
|
cmp.l %a4, %d0 | any leading longwords?
|
|
bls.b 20f | line loop start | no? start line loop
|
|
10: | long loop 0 |
|
|
move.l (%a2)+, %d1 | read longword from L and R
|
|
move.l %a6, %acc0 |
|
|
move.l %acc0, %acc1 |
|
|
mac.l %d1, %a1, (%a3)+, %d2, %acc0 | shift L to high word
|
|
mac.l %d2, %a1, %acc1 | shift R to high word
|
|
movclr.l %acc0, %d1 | get possibly saturated results
|
|
movclr.l %acc1, %d2 |
|
|
swap.w %d2 | move R to low word
|
|
move.w %d2, %d1 | interleave MS 16 bits of each
|
|
move.l %d1, (%a4)+ | ...and write both
|
|
cmp.l %a4, %d0 |
|
|
bhi.b 10b | long loop 0 |
|
|
20: | line loop start |
|
|
lea.l -12(%a0), %a5 | %a5 = at or just before last line bound
|
|
30: | line loop |
|
|
move.l (%a3)+, %d4 | get next 4 R samples and scale
|
|
move.l %a6, %acc0 |
|
|
move.l %acc0, %acc1 |
|
|
move.l %acc1, %acc2 |
|
|
move.l %acc2, %acc3 |
|
|
mac.l %d4, %a1, (%a3)+, %d5, %acc0 | with saturation
|
|
mac.l %d5, %a1, (%a3)+, %d6, %acc1 |
|
|
mac.l %d6, %a1, (%a3)+, %d7, %acc2 |
|
|
mac.l %d7, %a1, (%a2)+, %d0, %acc3 |
|
|
lea.l 16(%a4), %a4 | increment dest here, mitigate stalls
|
|
movclr.l %acc0, %d4 | obtain R results
|
|
movclr.l %acc1, %d5 |
|
|
movclr.l %acc2, %d6 |
|
|
movclr.l %acc3, %d7 |
|
|
move.l %a6, %acc0 |
|
|
move.l %acc0, %acc1 |
|
|
move.l %acc1, %acc2 |
|
|
move.l %acc2, %acc3 |
|
|
mac.l %d0, %a1, (%a2)+, %d1, %acc0 | get next 4 L samples and scale
|
|
mac.l %d1, %a1, (%a2)+, %d2, %acc1 | with saturation
|
|
mac.l %d2, %a1, (%a2)+, %d3, %acc2 |
|
|
mac.l %d3, %a1 , %acc3 |
|
|
swap.w %d4 | a) interleave most significant...
|
|
swap.w %d5 |
|
|
swap.w %d6 |
|
|
swap.w %d7 |
|
|
movclr.l %acc0, %d0 | obtain L results
|
|
movclr.l %acc1, %d1 |
|
|
movclr.l %acc2, %d2 |
|
|
movclr.l %acc3, %d3 |
|
|
move.w %d4, %d0 | a) ... 16 bits of L and R
|
|
move.w %d5, %d1 |
|
|
move.w %d6, %d2 |
|
|
move.w %d7, %d3 |
|
|
movem.l %d0-%d3, -16(%a4) | write four stereo samples
|
|
cmp.l %a4, %a5 |
|
|
bhi.b 30b | line loop |
|
|
40: | long loop 1 start |
|
|
cmp.l %a4, %a0 | any longwords left?
|
|
bls.b 60f | output end | no? stop
|
|
50: | long loop 1 |
|
|
move.l (%a2)+, %d1 | handle trailing longwords
|
|
move.l %a6, %acc0 |
|
|
move.l %acc0, %acc1 |
|
|
mac.l %d1, %a1, (%a3)+, %d2, %acc0 | the same way as leading ones
|
|
mac.l %d2, %a1, %acc1 |
|
|
movclr.l %acc0, %d1 |
|
|
movclr.l %acc1, %d2 |
|
|
swap.w %d2 |
|
|
move.w %d2, %d1 |
|
|
move.l %d1, (%a4)+ |
|
|
cmp.l %a4, %a0 |
|
|
bhi.b 50b | long loop 1
|
|
60: | output end |
|
|
movem.l (%sp), %d1-%d7/%a2-%a6 | restore registers
|
|
move.l %d1, %macsr |
|
|
lea.l 48(%sp), %sp | cleanup
|
|
rts |
|
|
.size sample_output_stereo, .-sample_output_stereo
|
|
|
|
/****************************************************************************
|
|
* void sample_output_mono(struct sample_io_data *this,
|
|
* struct dsp_buffer *src,
|
|
* struct dsp_buffer *dst)
|
|
*
|
|
* Same treatment as sample_output_stereo but for one channel.
|
|
*/
|
|
.section .text
|
|
.align 2
|
|
.global sample_output_mono
|
|
sample_output_mono:
|
|
| input: 4(sp) = count, 8(sp) = src, 12(sp) = dst
|
|
lea.l -32(%sp), %sp | save registers
|
|
move.l %macsr, %d1 | do it now as at many lines will
|
|
movem.l %d1-%d5/%a2-%a4, (%sp) | be the far more common condition
|
|
move.l #0x80, %macsr | put emac unit in signed int mode
|
|
movem.l 36(%sp), %a0-%a2 | %a0 = this, %a1 = src, %a2 = dst
|
|
move.l (%a0), %a0 | %a0 = this->outcount
|
|
move.l 4(%a2), %a3 | %a3 = dst->p16out
|
|
movem.l 4(%a1), %a2 | %a2 = src->p32[0]
|
|
lea.l (%a3, %a0.l*4), %a0 | %a0 = count -> end address
|
|
clr.l %d1 | %d5 = multiplier: (1 << (16 - scale))
|
|
move.b 19(%a1), %d1 | %d1 = src->format.output_scale
|
|
sub.l #16, %d1 |
|
|
neg.l %d1 |
|
|
moveq.l #1, %d5 |
|
|
asl.l %d1, %d5 |
|
|
move.l #0x8000, %a4 | %a4 = rounding term
|
|
moveq.l #28, %d0 | %d0 = second line bound
|
|
add.l %a3, %d0 |
|
|
and.l #0xfffffff0, %d0 |
|
|
cmp.l %a0, %d0 | at least a full line?
|
|
bhi.w 40f | long loop 1 start | no? do as trailing longwords
|
|
sub.l #16, %d0 | %d1 = first line bound
|
|
cmp.l %a3, %d0 | any leading longwords?
|
|
bls.b 20f | line loop start | no? start line loop
|
|
10: | long loop 0 |
|
|
move.l (%a2)+, %d1 | read longword from L and R
|
|
move.l %a4, %acc0 |
|
|
mac.l %d1, %d5, %acc0 | shift L to high word
|
|
movclr.l %acc0, %d1 | get possibly saturated results
|
|
move.l %d1, %d2 |
|
|
swap.w %d2 | move R to low word
|
|
move.w %d2, %d1 | duplicate single channel into
|
|
move.l %d1, (%a3)+ | L and R
|
|
cmp.l %a3, %d0 |
|
|
bhi.b 10b | long loop 0 |
|
|
20: | line loop start |
|
|
lea.l -12(%a0), %a1 | %a1 = at or just before last line bound
|
|
30: | line loop |
|
|
move.l (%a2)+, %d0 | get next 4 L samples and scale
|
|
move.l %a4, %acc0 |
|
|
move.l %acc0, %acc1 |
|
|
move.l %acc1, %acc2 |
|
|
move.l %acc2, %acc3 |
|
|
mac.l %d0, %d5, (%a2)+, %d1, %acc0 | with saturation
|
|
mac.l %d1, %d5, (%a2)+, %d2, %acc1 |
|
|
mac.l %d2, %d5, (%a2)+, %d3, %acc2 |
|
|
mac.l %d3, %d5 , %acc3 |
|
|
lea.l 16(%a3), %a3 | increment dest here, mitigate stalls
|
|
movclr.l %acc0, %d0 | obtain results
|
|
movclr.l %acc1, %d1 |
|
|
movclr.l %acc2, %d2 |
|
|
movclr.l %acc3, %d3 |
|
|
move.l %d0, %d4 | duplicate single channel
|
|
swap.w %d4 | into L and R
|
|
move.w %d4, %d0 |
|
|
move.l %d1, %d4 |
|
|
swap.w %d4 |
|
|
move.w %d4, %d1 |
|
|
move.l %d2, %d4 |
|
|
swap.w %d4 |
|
|
move.w %d4, %d2 |
|
|
move.l %d3, %d4 |
|
|
swap.w %d4 |
|
|
move.w %d4, %d3 |
|
|
movem.l %d0-%d3, -16(%a3) | write four stereo samples
|
|
cmp.l %a3, %a1 |
|
|
bhi.b 30b | line loop |
|
|
40: | long loop 1 start |
|
|
cmp.l %a3, %a0 | any longwords left?
|
|
bls.b 60f | output end | no? stop
|
|
50: | loop loop 1 |
|
|
move.l (%a2)+, %d1 | handle trailing longwords
|
|
move.l %a4, %acc0 |
|
|
mac.l %d1, %d5, %acc0 | the same way as leading ones
|
|
movclr.l %acc0, %d1 |
|
|
move.l %d1, %d2 |
|
|
swap.w %d2 |
|
|
move.w %d2, %d1 |
|
|
move.l %d1, (%a3)+ |
|
|
cmp.l %a3, %a0 |
|
|
bhi.b 50b | long loop 1 |
|
|
60: | output end |
|
|
movem.l (%sp), %d1-%d5/%a2-%a4 | restore registers
|
|
move.l %d1, %macsr |
|
|
lea.l 32(%sp), %sp | cleanup
|
|
rts |
|
|
.size sample_output_mono, .-sample_output_mono
|