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Improved trimming (#1458)

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* Add threshold UI
* WIP Better trimming
* Rewrite mostly done WIP
* WIP - trim idea
* WIP threshold trimming
* WIP with new design
* Cleanup
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Kyle Reed 2023-09-23 12:56:37 -07:00 • committed by GitHub
parent ef03f020ce
commit a6a1483083
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9 changed files with 417 additions and 210 deletions
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161
firmware/application/iq_trim.hpp
View file

@ -29,146 +29,65 @@
#include <functional>
#include <limits>
struct TrimRange {
uint64_t start;
uint64_t end;
uint64_t sample_count;
namespace iq {
/* Information about a capture. */
struct CaptureInfo {
uint64_t file_size;
uint64_t sample_count;
uint8_t sample_size;
uint32_t max_power;
};
/* Holds sample average power by bucket. */
struct PowerBuckets {
struct Bucket {
uint8_t power;
uint32_t power = 0;
uint8_t count = 0;
};
Bucket* p = nullptr;
size_t size = 0;
const size_t size = 0;
void add(size_t index) {
// This originally was meant to be an average power for the bucket,
// but it was a lot of extra math just for a little bit of UI and
// the math really slowed down processing. Instead, just count the
// number of samples above the threshold.
/* Add the power to the bucket average at index. */
void add(size_t index, uint32_t power) {
if (index < size) {
if (p[index].power < 255)
p[index].power++;
auto& b = p[index];
auto avg = static_cast<uint64_t>(b.power) * b.count;
b.count++;
b.power = (power + avg) / b.count;
}
}
};
inline bool TrimFile(const std::filesystem::path& path, TrimRange range) {
// NB: range.end should be included in the trimmed result, so '+ sample_size'.
auto result = trim_file(path, range.start, (range.end - range.start) + range.sample_size);
return result.ok();
}
template <typename T>
class IQTrimmer {
static constexpr uint8_t max_amp = 0xFF;
static constexpr typename T::value_type max_value = std::numeric_limits<typename T::value_type>::max();
static constexpr uint32_t max_mag_squared{2 * (max_value * max_value)}; // NB: Braces to detect narrowing.
public:
static Optional<TrimRange> ComputeTrimRange(
const std::filesystem::path& path,
uint8_t amp_threshold, // 0 - 255
PowerBuckets* buckets,
std::function<void(uint8_t)> on_progress) {
TrimRange range{};
File f;
auto error = f.open(path);
if (error)
return {};
constexpr size_t buffer_size = std::filesystem::max_file_block_size;
uint8_t buffer[buffer_size];
bool has_start = false;
size_t sample_index = 0;
File::Offset offset = 0;
uint8_t last_progress = 0;
size_t samples_per_bucket = 1;
// Scale from 0-255 to 0-max_mag_squared.
uint32_t threshold = (max_mag_squared * amp_threshold) / max_amp;
T value{};
range.file_size = f.size();
range.sample_size = sizeof(T);
range.sample_count = range.file_size / range.sample_size;
if (buckets)
samples_per_bucket = std::max(1ULL, range.sample_count / buckets->size);
while (true) {
auto result = f.read(buffer, buffer_size);
if (!result)
return {};
for (size_t i = 0; i < *result; i += sizeof(T)) {
++sample_index;
value = *reinterpret_cast<T*>(&buffer[i]);
auto real = value.real();
auto imag = value.imag();
uint32_t mag_squared = (real * real) + (imag * imag);
// Update range if above threshold.
if (mag_squared >= threshold) {
if (has_start) {
range.end = offset + i;
} else {
range.start = offset + i;
range.end = range.start;
has_start = true;
}
// Update the optional power bucket.
if (buckets) {
auto bucket_index = sample_index / samples_per_bucket;
buckets->add(bucket_index);
}
}
}
if (*result < buffer_size)
break;
offset += *result;
if (on_progress) {
uint8_t current_progress = 100 * offset / range.file_size;
if (last_progress != current_progress) {
on_progress(current_progress);
last_progress = current_progress;
}
}
}
return range;
}
/* Data needed to trim a capture by sample range.
* end_sample is the sample *after* the last to keep. */
struct TrimRange {
uint64_t start_sample;
uint64_t end_sample;
uint8_t sample_size;
};
inline Optional<TrimRange> ComputeTrimRange(
/* Collects capture file metadata and samples power buckets. */
Optional<CaptureInfo> profile_capture(
const std::filesystem::path& path,
uint8_t amp_threshold = 5,
PowerBuckets* buckets = nullptr,
std::function<void(uint8_t)> on_progress = nullptr) {
Optional<TrimRange> range;
auto sample_size = std::filesystem::capture_file_sample_size(path);
PowerBuckets& buckets,
uint8_t samples_per_bucket = 10);
switch (sample_size) {
case sizeof(complex16_t):
return IQTrimmer<complex16_t>::ComputeTrimRange(path, amp_threshold, buckets, on_progress);
/* Computes the trimming range given profiling info.
* Cutoff percent is a number 1-100. */
TrimRange compute_trim_range(
CaptureInfo info,
const PowerBuckets& buckets,
uint8_t cutoff_percent);
case sizeof(complex8_t):
return IQTrimmer<complex8_t>::ComputeTrimRange(path, amp_threshold, buckets, on_progress);
/* Trims the capture file with the specified range. */
bool trim_capture_with_range(
const std::filesystem::path& path,
TrimRange range,
const std::function<void(uint8_t)>& on_progress);
default:
return {};
};
}
} // namespace iq
#endif /*__IQ_TRIM_H__*/
#endif /*__IQ_TRIM_H__*/