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Add real-time WebSocket waterfall with I/Q capture and server-side FFT

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Replace the batch rtl_power SSE pipeline with continuous I/Q streaming
via WebSocket for smooth ~25fps waterfall display. The server captures
raw I/Q samples (rtl_sdr/rx_sdr), computes Hann-windowed FFT, and
sends compact binary frames (1035 bytes vs ~15KB JSON, 93% reduction).
Client falls back to existing SSE path if WebSocket is unavailable.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-08 12:37:50 +00:00
parent 7aae2944d4
commit 026337a350
12 changed files with 1107 additions and 8 deletions
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12
templates/index.html
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@@ -525,12 +525,12 @@
</div>
</div>
<div class="form-group" style="margin-bottom: 6px;">
<label style="font-size: 10px;">Bin Size</label>
<select id="waterfallBinSize" style="width: 100%; padding: 5px; background: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-primary); border-radius: 4px; font-size: 11px;">
<option value="5000">5 kHz</option>
<option value="10000" selected>10 kHz</option>
<option value="25000">25 kHz</option>
<option value="100000">100 kHz</option>
<label style="font-size: 10px;">FFT Size</label>
<select id="waterfallFftSize" style="width: 100%; padding: 5px; background: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-primary); border-radius: 4px; font-size: 11px;">
<option value="512">512</option>
<option value="1024" selected>1024</option>
<option value="2048">2048</option>
<option value="4096">4096</option>
</select>
</div>
<div class="form-group" style="margin-bottom: 8px;">