/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2011 by Michael Sevakis * * 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. * ****************************************************************************/ #define MIXER_OPTIMIZED_MIX_SAMPLES #define MIXER_OPTIMIZED_WRITE_SAMPLES /* Mix channels' samples and apply gain factors */ static FORCE_INLINE void mix_samples(void *out, void *src0, int32_t src0_amp, void *src1, int32_t src1_amp, size_t size) { uint32_t s0, s1; if (src0_amp == MIX_AMP_UNITY && src1_amp == MIX_AMP_UNITY) { /* Both are unity amplitude */ asm volatile ( "1: \n" "ldr %4, [%1], #4 \n" "ldr %5, [%2], #4 \n" "subs %3, %3, #4 \n" "qadd16 %5, %5, %4 \n" "str %5, [%0], #4 \n" "bhi 1b \n" : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size), "=&r"(s0), "=&r"(s1)); } else { /* One or neither are unity amplitude */ uint32_t tmp; asm volatile ( "1: \n" "ldr %4, [%1], #4 \n" "ldr %5, [%2], #4 \n" "subs %3, %3, #4 \n" "smulwb %6, %7, %4 \n" "smulwt %4, %7, %4 \n" "smlawb %6, %8, %5, %6 \n" "smlawt %4, %8, %5, %4 \n" "ssat %6, #16, %6 \n" "ssat %4, #16, %4 \n" "pkhbt %6, %6, %4, asl #16 \n" "str %6, [%0], #4 \n" "bhi 1b \n" : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size), "=&r"(s0), "=&r"(s1), "=&r"(tmp) : "r"(src0_amp), "r"(src1_amp)); } } /* Write channel's samples and apply gain factor */ static FORCE_INLINE void write_samples(void *out, void *src, int32_t amp, size_t size) { if (LIKELY(amp == MIX_AMP_UNITY)) { /* Channel is unity amplitude */ asm volatile ( "ands r1, %2, #0x1f \n" "beq 2f \n" "1: \n" "ldr r0, [%1], #4 \n" "subs r1, r1, #4 \n" "str r0, [%0], #4 \n" "bne 1b \n" "bics %2, %2, #0x1f \n" "beq 3f \n" "2: \n" "ldmia %1!, { r0-r7 } \n" "subs %2, %2, #32 \n" "stmia %0!, { r0-r7 } \n" "bhi 2b \n" "3: \n" : "+r"(out), "+r"(src), "+r"(size) : : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7"); } else { /* Channel needs amplitude cut */ uint32_t s, tmp; asm volatile( "1: \n" "ldr %3, [%1], #4 \n" "subs %2, %2, #4 \n" "smulwt %4, %5, %3 \n" "smulwb %3, %5, %3 \n" "pkhbt %4, %3, %4, asl #16 \n" "str %4, [%0], #4 \n" "bhi 1b \n" : "+r"(out), "+r"(src), "+r"(size), "=&r"(s), "=&r"(tmp) : "r"(amp)); } }