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- /* Audio Library for Teensy 3.X
- * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
- *
- * Development of this audio library was funded by PJRC.COM, LLC by sales of
- * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
- * open source software by purchasing Teensy or other PJRC products.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice, development funding notice, and this permission
- * notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- #include <core/Arduino.h>
- #include "audio/effect_multiply.h"
-
- void AudioEffectMultiply::update(void)
- {
- #if defined(__ARM_ARCH_7EM__)
- audio_block_t *blocka, *blockb;
- uint32_t *pa, *pb, *end;
- uint32_t a12, a34; //, a56, a78;
- uint32_t b12, b34; //, b56, b78;
-
- blocka = receiveWritable(0);
- blockb = receiveReadOnly(1);
- if (!blocka) {
- if (blockb) release(blockb);
- return;
- }
- if (!blockb) {
- release(blocka);
- return;
- }
- pa = (uint32_t *)(blocka->data);
- pb = (uint32_t *)(blockb->data);
- end = pa + AUDIO_BLOCK_SAMPLES/2;
- while (pa < end) {
- a12 = *pa;
- a34 = *(pa+1);
- //a56 = *(pa+2); // 8 samples/loop should work, but crashes.
- //a78 = *(pa+3); // why?! maybe a compiler bug??
- b12 = *pb++;
- b34 = *pb++;
- //b56 = *pb++;
- //b78 = *pb++;
- a12 = pack_16b_16b(
- signed_saturate_rshift(multiply_16tx16t(a12, b12), 16, 15),
- signed_saturate_rshift(multiply_16bx16b(a12, b12), 16, 15));
- a34 = pack_16b_16b(
- signed_saturate_rshift(multiply_16tx16t(a34, b34), 16, 15),
- signed_saturate_rshift(multiply_16bx16b(a34, b34), 16, 15));
- //a56 = pack_16b_16b(
- // signed_saturate_rshift(multiply_16tx16t(a56, b56), 16, 15),
- // signed_saturate_rshift(multiply_16bx16b(a56, b56), 16, 15));
- //a78 = pack_16b_16b(
- // signed_saturate_rshift(multiply_16tx16t(a78, b78), 16, 15),
- // signed_saturate_rshift(multiply_16bx16b(a78, b78), 16, 15));
- *pa++ = a12;
- *pa++ = a34;
- //*pa++ = a56;
- //*pa++ = a78;
- }
- transmit(blocka);
- release(blocka);
- release(blockb);
-
- #elif defined(KINETISL)
- audio_block_t *block;
-
- block = receiveReadOnly(0);
- if (block) release(block);
- block = receiveReadOnly(1);
- if (block) release(block);
- #endif
- }
-
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