15b4baba28
- minimize RAM usage of all components - use both IRAM and DRAM in player component so we can buffer up to 1s on modules without SPI RAM - support fragemented pcm chunks so we can use all available RAM if there isn't a big enough block available but still enough HEAP - reinclude all components from jorgen's master branch - add custom i2s driver to get a precise timing of initial sync - change wrong usage of esp_timer for latency measurement of snapcast protocol - add player component
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "dsps_dotprod.h"
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esp_err_t dsps_dotprod_s16_ansi(const int16_t *src1, const int16_t *src2, int16_t *dest, int len, int8_t shift)
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{
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// To make correct round operation we have to shift round value
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long long acc = 0x7fff >> shift;
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for (int i = 0 ; i < len ; i++) {
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acc += (int32_t)src1[i] * (int32_t)src2[i];
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}
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int final_shift = shift - 15;
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if (final_shift > 0) {
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*dest = (acc << final_shift);
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} else {
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*dest = (acc >> (-final_shift));
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}
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return ESP_OK;
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}
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