| /*************************************************************************** |
| * __________ __ ___. |
| * 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)); |
| } |
| } |