| /*************************************************************************** |
| * __________ __ ___. |
| * 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_WRITE_SAMPLES |
| #define MIXER_OPTIMIZED_MIX_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) |
| { |
| if (src0_amp == MIX_AMP_UNITY && src1_amp == MIX_AMP_UNITY) |
| { |
| /* Both are unity amplitude */ |
| int32_t l0, l1, h0, h1; |
| asm volatile ( |
| "1: \n" |
| "ldrsh %4, [%1], #2 \n" |
| "ldrsh %5, [%2], #2 \n" |
| "ldrsh %6, [%1], #2 \n" |
| "ldrsh %7, [%2], #2 \n" |
| "add %4, %4, %5 \n" |
| "add %6, %6, %7 \n" |
| "mov %5, %4, asr #15 \n" |
| "teq %5, %5, asr #31 \n" |
| "eorne %4, %8, %4, asr #31 \n" |
| "mov %7, %6, asr #15 \n" |
| "teq %7, %7, asr #31 \n" |
| "eorne %6, %8, %6, asr #31 \n" |
| "subs %3, %3, #4 \n" |
| "and %4, %4, %8, lsr #16 \n" |
| "orr %6, %4, %6, lsl #16 \n" |
| "str %6, [%0], #4 \n" |
| "bhi 1b \n" |
| : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size), |
| "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1) |
| : "r"(0xffff7fff)); |
| } |
| else if (src0_amp != MIX_AMP_UNITY && src1_amp != MIX_AMP_UNITY) |
| { |
| /* Neither are unity amplitude */ |
| int32_t l0, l1, h0, h1; |
| asm volatile ( |
| "1: \n" |
| "ldrsh %4, [%1], #2 \n" |
| "ldrsh %5, [%2], #2 \n" |
| "ldrsh %6, [%1], #2 \n" |
| "ldrsh %7, [%2], #2 \n" |
| "mul %4, %8, %4 \n" |
| "mul %5, %9, %5 \n" |
| "mul %6, %8, %6 \n" |
| "mul %7, %9, %7 \n" |
| "mov %4, %4, asr #16 \n" |
| "add %4, %4, %5, asr #16 \n" |
| "mov %6, %6, asr #16 \n" |
| "add %6, %6, %7, asr #16 \n" |
| "mov %5, %4, asr #15 \n" |
| "teq %5, %5, asr #31 \n" |
| "eorne %4, %10, %4, asr #31 \n" |
| "mov %7, %6, asr #15 \n" |
| "teq %7, %7, asr #31 \n" |
| "eorne %6, %10, %6, asr #31 \n" |
| "subs %3, %3, #4 \n" |
| "and %4, %4, %10, lsr #16 \n" |
| "orr %6, %4, %6, lsl #16 \n" |
| "str %6, [%0], #4 \n" |
| "bhi 1b \n" |
| : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size), |
| "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1) |
| : "r"(src0_amp), "r"(src1_amp), "r"(0xffff7fff)); |
| } |
| else |
| { |
| /* One is unity amplitude */ |
| if (src0_amp != MIX_AMP_UNITY) |
| { |
| /* Keep unity in src0, amp0 */ |
| int16_t *src_tmp = src0; |
| src0 = src1; |
| src1 = src_tmp; |
| src1_amp = src0_amp; |
| src0_amp = MIX_AMP_UNITY; |
| } |
| |
| int32_t l0, l1, h0, h1; |
| asm volatile ( |
| "1: \n" |
| "ldrsh %4, [%1], #2 \n" |
| "ldrsh %5, [%2], #2 \n" |
| "ldrsh %6, [%1], #2 \n" |
| "ldrsh %7, [%2], #2 \n" |
| "mul %5, %8, %5 \n" |
| "mul %7, %8, %7 \n" |
| "add %4, %4, %5, asr #16 \n" |
| "add %6, %6, %7, asr #16 \n" |
| "mov %5, %4, asr #15 \n" |
| "teq %5, %5, asr #31 \n" |
| "eorne %4, %9, %4, asr #31 \n" |
| "mov %7, %6, asr #15 \n" |
| "teq %7, %7, asr #31 \n" |
| "eorne %6, %9, %6, asr #31 \n" |
| "subs %3, %3, #4 \n" |
| "and %4, %4, %9, lsr #16 \n" |
| "orr %6, %4, %6, lsl #16 \n" |
| "str %6, [%0], #4 \n" |
| "bhi 1b \n" |
| : "+r"(out), "+r"(src0), "+r"(src1), "+r"(size), |
| "=&r"(l0), "=&r"(l1), "=&r"(h0), "=&r"(h1) |
| : "r"(src1_amp), "r"(0xffff7fff)); |
| } |
| } |
| |
| /* 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 l, h; |
| asm volatile ( |
| "1: \n" |
| "ldrsh %3, [%1], #2 \n" |
| "ldrsh %4, [%1], #2 \n" |
| "subs %2, %2, #4 \n" |
| "mul %3, %5, %3 \n" |
| "mul %4, %5, %4 \n" |
| "and %4, %4, %6, lsl #16 \n" |
| "orr %4, %4, %3, lsr #16 \n" |
| "str %4, [%0], #4 \n" |
| "bhi 1b \n" |
| : "+r"(out), "+r"(src), "+r"(size), |
| "=&r"(l), "=&r"(h) |
| : "r"(amp), "r"(0xffffffffu)); |
| } |
| } |