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[fix](trx-rs): improve FT2 decoder acquisition

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Use FT2-specific analysis settings and a wider receive span.
Switch server-side FT2 decoding to a rolling async window.
Widen FT2 candidate timing search in the vendored decoder.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
This commit is contained in:
Stan Grams
2026-03-14 20:20:18 +01:00
parent b032473801
commit 2570fe739e
4 changed files with 145 additions and 48 deletions
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external/ft8_lib/ft8/decode.c
Vendored
+14 -1
View File
@@ -189,9 +189,22 @@ static int ft4_sync_score(const ftx_waterfall_t* wf, const ftx_candidate_t* cand
int ftx_find_candidates(const ftx_waterfall_t* wf, int num_candidates, ftx_candidate_t heap[], int min_score)
{
bool is_ft2 = (wf->protocol == FTX_PROTOCOL_FT2);
int (*sync_fun)(const ftx_waterfall_t*, const ftx_candidate_t*) =
ftx_protocol_uses_ft4_layout(wf->protocol) ? ft4_sync_score : ft8_sync_score;
int num_tones = ftx_protocol_uses_ft4_layout(wf->protocol) ? 4 : 8;
int time_offset_min = -10;
int time_offset_max = 20;
if (is_ft2)
{
time_offset_min = -2;
time_offset_max = wf->num_blocks - FT2_NN + 2;
if (time_offset_max <= time_offset_min)
{
time_offset_max = time_offset_min + 1;
}
}
int heap_size = 0;
ftx_candidate_t candidate;
@@ -203,7 +216,7 @@ int ftx_find_candidates(const ftx_waterfall_t* wf, int num_candidates, ftx_candi
{
for (candidate.freq_sub = 0; candidate.freq_sub < wf->freq_osr; ++candidate.freq_sub)
{
for (candidate.time_offset = -10; candidate.time_offset < 20; ++candidate.time_offset)
for (candidate.time_offset = time_offset_min; candidate.time_offset < time_offset_max; ++candidate.time_offset)
{
for (candidate.freq_offset = 0; (candidate.freq_offset + num_tones - 1) < wf->num_bins; ++candidate.freq_offset)
{