Fix live species labeling on the spectrogram for non-RTSP setups (ajax_csv doubled the directory in the path)

[EvaldoOliveira]

Problem

The live species-name overlay on the Spectrogram view never draws anything on non-RTSP (USB/ALSA mic) installations.

The ajax_csv endpoint's non-RTSP branch collects the detection json with glob($look_in_directory . "*.wav.json"), which returns full paths. Later the file is read with:

$contents = file_get_contents($look_in_directory . $newest_file);

so the directory is prepended a second time (/home/pi/BirdSongs/StreamData//home/pi/BirdSongs/StreamData/....wav.json), file_get_contents() fails, and the endpoint always answers an empty 200 — the browser JS (loadDetectionIfNewExists) then never draws a label. The RTSP branch is unaffected because it uses scandir(), which returns basenames.

A second small issue in the same lines: $files[0] picks the alphabetically first match rather than the newest (relevant when more than one json exists, e.g. multiple streams' leftovers).

Fix

Reduce the newest glob match to a basename, mirroring what the RTSP branch produces:

$newest_file = basename(end($files));

(glob() sorts alphabetically by default, which is chronological for these date-prefixed file names.)

Testing

On a Pi 4 station (USB mic, no RTSP), before: curl 'http://localhost/spectrogram.php?ajax_csv=true' → HTTP 200, empty body. After: the newest detection json is returned (file_name, timestamp, delay, detections[]), the repeat-poll dedup (newest_file= parameter) answers empty as expected, and detected species names are drawn on the live spectrogram again.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VZUYHB2yN6XCPYyUWf7mzG