/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * Copyright (C) 2007 Michael Sevakis (jhMikeS) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #if SPC_NOINTERP #define SPC_LINEAR_INTERP static inline int linear_interp( int16_t const* samples, int32_t position ) { uint32_t f = position; int32_t y0, y1; /** * output = y0 + f*y1 - f*y0 */ asm volatile ( "move.l %[f], %[y1] \n" /* separate frac and whole */ "and.l #0xfff, %[f] \n" "asr.l %[sh], %[y1] \n" "move.l 2(%[s], %[y1].l*2), %[y1] \n" /* y0=upper, y1=lower */ "mac.w %[f]l, %[y1]l, %%acc0 \n" /* %acc0 = f*y1 */ "msac.w %[f]l, %[y1]u, %%acc0 \n" /* %acc0 -= f*y0 */ "swap %[y1] \n" /* separate out y0 and sign extend */ "movea.w %[y1], %[y0] \n" "movclr.l %%acc0, %[y1] \n" /* fetch, scale down, add y0 */ "asr.l %[sh], %[y1] \n" /* output = y0 + (result >> 12) */ "add.l %[y0], %[y1] \n" : [f]"+d"(f), [y0]"=&a"(y0), [y1]"=&d"(y1) : [s]"a"(samples), [sh]"d"(12)); return y1; } #define SPC_LINEAR_AMP static inline int linear_amp( struct voice_t* voice, int output, int* amp_0, int* amp_1 ) { asm volatile ( "mac.w %[out]l, %[envx]l, %%acc0" : : [out]"r"(output), [envx]"r"(voice->envx)); asm volatile ( "movclr.l %%acc0, %[out] \n" "asr.l #8, %[out] \n" "mac.l %[v0], %[out], %%acc0 \n" "mac.l %[v1], %[out], %%acc1 \n" "asr.l #3, %[out] \n" : [out]"+r"(output) : [v0]"r"((int) voice->volume [0]), [v1]"r"((int) voice->volume [1])); asm volatile ( "movclr.l %%acc0, %[a0] \n" "asr.l #3, %[a0] \n" "movclr.l %%acc1, %[a1] \n" "asr.l #3, %[a1] \n" : [a0]"=d"(*amp_0), [a1]"=d"(*amp_1)); return output; } #endif /* SPC_NOINTERP */ #if !SPC_NOECHO #define SPC_DSP_ECHO_APPLY /* Echo filter history */ static int32_t fir_buf[FIR_BUF_CNT] IBSS_ATTR_SPC __attribute__(( aligned(FIR_BUF_ALIGN*1) )); static inline void echo_init( struct Spc_Dsp* this ) { /* Initialize mask register with the buffer address mask */ asm volatile ("move.l %0, %%mask" : : "i"(FIR_BUF_MASK)); this->fir.ptr = fir_buf; this->fir.hist_ptr = &fir_buf [1]; ci->memset( fir_buf, 0, sizeof fir_buf ); } static inline void echo_apply( struct Spc_Dsp* this, uint8_t* echo_ptr, int* out_0, int* out_1 ) { int t0, t1, t2; t1 = swap_odd_even32( *(int32_t *)echo_ptr ); /* Keep last 8 samples */ *this->fir.ptr = t1; this->fir.ptr = this->fir.hist_ptr; asm volatile ( "move.l (%[c]) , %[t2] \n" "mac.w %[t1]u, %[t2]u, <<, (%[p])+&, %[t0], %%acc0 \n" "mac.w %[t1]l, %[t2]u, <<, (%[p])& , %[t1], %%acc1 \n" "mac.w %[t0]u, %[t2]l, << , %%acc0 \n" "mac.w %[t0]l, %[t2]l, <<, 4(%[c]) , %[t2], %%acc1 \n" "mac.w %[t1]u, %[t2]u, <<, 4(%[p])& , %[t0], %%acc0 \n" "mac.w %[t1]l, %[t2]u, <<, 8(%[p])& , %[t1], %%acc1 \n" "mac.w %[t0]u, %[t2]l, << , %%acc0 \n" "mac.w %[t0]l, %[t2]l, <<, 8(%[c]) , %[t2], %%acc1 \n" "mac.w %[t1]u, %[t2]u, <<, 12(%[p])& , %[t0], %%acc0 \n" "mac.w %[t1]l, %[t2]u, <<, 16(%[p])& , %[t1], %%acc1 \n" "mac.w %[t0]u, %[t2]l, << , %%acc0 \n" "mac.w %[t0]l, %[t2]l, <<, 12(%[c]) , %[t2], %%acc1 \n" "mac.w %[t1]u, %[t2]u, <<, 20(%[p])& , %[t0], %%acc0 \n" "mac.w %[t1]l, %[t2]u, << , %%acc1 \n" "mac.w %[t0]u, %[t2]l, << , %%acc0 \n" "mac.w %[t0]l, %[t2]l, << , %%acc1 \n" : [t0]"=&r"(t0), [t1]"+r"(t1), [t2]"=&r"(t2), [p]"+a"(this->fir.hist_ptr) : [c]"a"(this->fir.coeff)); asm volatile ( "movclr.l %%acc0, %[o0] \n" "movclr.l %%acc1, %[o1] \n" "mac.l %[ev0], %[o0], >>, %%acc2 \n" /* echo volume */ "mac.l %[ev1], %[o1], >>, %%acc3 \n" : [o0]"=&r"(*out_0), [o1]"=&r"(*out_1) : [ev0]"r"((int) this->r.g.echo_volume_0), [ev1]"r"((int) this->r.g.echo_volume_1)); } #define SPC_DSP_ECHO_FEEDBACK static inline void echo_feedback( struct Spc_Dsp* this, uint8_t* echo_ptr, int echo_0, int echo_1, int fb_0, int fb_1 ) { asm volatile ( /* scale echo voices; saturate if overflow */ "mac.l %[sh], %[e1] , %%acc1 \n" "mac.l %[sh], %[e0] , %%acc0 \n" /* add scaled output from FIR filter */ "mac.l %[fb1], %[ef], <<, %%acc1 \n" "mac.l %[fb0], %[ef], <<, %%acc0 \n" : : [e0]"d"(echo_0), [e1]"d"(echo_1), [fb0]"r"(fb_0), [fb1]"r"(fb_1), [ef]"r"((int)this->r.g.echo_feedback), [sh]"r"(1 << 9)); /* swap and fetch feedback results */ int t0; asm volatile( "move.l #0x00ff00ff, %[t0] \n" "movclr.l %%acc1, %[e1] \n" "swap.w %[e1] \n" "movclr.l %%acc0, %[e0] \n" "move.w %[e1], %[e0] \n" "and.l %[e0], %[t0] \n" "eor.l %[t0], %[e0] \n" "lsl.l #8, %[t0] \n" "lsr.l #8, %[e0] \n" "or.l %[e0], %[t0] \n" : [e0]"=&d"(echo_0), [e1]"=&d"(echo_1), [t0]"=&d"(t0)); /* save final feedback into echo buffer */ *(int32_t *)echo_ptr = t0; } #define SPC_DSP_GENERATE_OUTPUT static inline void echo_output( struct Spc_Dsp* this, int global_muting, int global_vol_0, int global_vol_1, int chans_0, int chans_1, int fb_0, int fb_1, int* out_0, int* out_1 ) { asm volatile ( "mac.l %[ch0], %[gv0], %%acc2 \n" /* global volume */ "mac.l %[ch1], %[gv1], %%acc3 \n" : : [ch0]"r"(chans_0), [gv0]"r"(global_vol_0), [ch1]"r"(chans_1), [gv1]"r"(global_vol_1)); asm volatile ( "movclr.l %%acc2, %[a0] \n" /* fetch mixed output */ "movclr.l %%acc3, %[a1] \n" "asr.l %[gm], %[a0] \n" /* scale by global_muting shift */ "asr.l %[gm], %[a1] \n" : [a0]"=&d"(*out_0), [a1]"=&d"(*out_1) : [gm]"d"(global_muting)); /* scaled echo is stored in %acc2 and %acc3 */ (void)this; (void)fb_0; (void)fb_1; } #endif /* !SPC_NOECHO */