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103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
/*
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* Copyright (C) 2023 Kyle Reed
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __IQ_TRIM_H__
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#define __IQ_TRIM_H__
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#include "complex.hpp"
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#include "file.hpp"
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#include "optional.hpp"
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#include <functional>
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#include <limits>
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namespace iq {
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/* Information about a capture. */
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struct CaptureInfo {
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uint64_t file_size;
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uint64_t sample_count;
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uint8_t sample_size;
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uint32_t max_power;
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uint32_t max_iq;
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};
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/* Holds sample average power by bucket. */
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struct PowerBuckets {
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struct Bucket {
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uint32_t power = 0;
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uint8_t count = 0;
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};
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Bucket* p = nullptr;
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const size_t size = 0;
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/* Add the power to the bucket average at index. */
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void add(size_t index, uint32_t power) {
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if (index < size) {
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auto& b = p[index];
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auto avg = static_cast<uint64_t>(b.power) * b.count;
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b.count++;
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b.power = (power + avg) / b.count;
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}
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}
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};
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/* Data needed to trim a capture by sample range.
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* end_sample is the sample *after* the last to keep. */
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struct TrimRange {
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uint64_t start_sample;
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uint64_t end_sample;
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uint8_t sample_size;
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};
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/* Collects capture file metadata and samples power buckets. */
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Optional<CaptureInfo> profile_capture(
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const std::filesystem::path& path,
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PowerBuckets& buckets,
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uint8_t samples_per_bucket = 10);
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/* Computes the trimming range given profiling info.
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* Cutoff percent is a number 1-100. */
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TrimRange compute_trim_range(
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CaptureInfo info,
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const PowerBuckets& buckets,
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uint8_t cutoff_percent);
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/* Multiplies samples in an IQ buffer by amplification value */
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void amplify_iq_buffer(
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uint8_t* buffer,
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uint32_t length,
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uint32_t amplification,
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uint8_t sample_size);
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/* Trims the capture file with the specified range. */
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bool trim_capture_with_range(
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const std::filesystem::path& path,
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TrimRange range,
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const std::function<void(uint8_t)>& on_progress,
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const uint32_t amplification);
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} // namespace iq
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#endif /*__IQ_TRIM_H__*/
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