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
51 lines
1.6 KiB
C
51 lines
1.6 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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#ifndef _dsps_sfdr_H_
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#define _dsps_sfdr_H_
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#include "dsp_err.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**
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* @brief SFDR
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*
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* The function calculates Spurious-Free Dynamic Range.
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* The function makes FFT of the input, then search a spectrum maximum, and then compare
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* maximum value with all others. Result calculated as minimum value.
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* This function have to be used for debug and unit tests only. It's not optimized for real-time processing.
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* The implementation use ANSI C and could be compiled and run on any platform
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*
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* @param[in] input: input array.
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* @param len: length of the input signal
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* @param use_dc: this parameter define will be DC value used for calculation or not.
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* 0 - SNR will not include DC power
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* 1 - SNR will include DC power
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*
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* @return
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* - SFDR in DB
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*/
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float dsps_sfdr_f32(const float *input, int32_t len, int8_t use_dc);
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float dsps_sfdr_fc32(const float *input, int32_t len);
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#ifdef __cplusplus
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}
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#endif
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#endif // _dsps_sfdr_H_
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