bsncubed 3ebb27e4bb Step 7.4: HLS audio on AES67 (44.1 -> 48 kHz into the ring)
- decoder: s16 PCM -> stereo int32 -> esp_ae_rate_cvt 44.1 -> 48 kHz
  (32-bit, complexity 3; bypassed at 48 kHz; mono duplicated) -> ring.
  esp_audio_effects pinned to ~1.3.0 (1.4+ needs P4 rev >= 3).
- hls: each segment is downloaded completely into PSRAM (max 4 MB), then
  decoded; the connection is not held open while the decoder waits for
  ring space at playback speed.
- player: player_write() blocks while the ring is full and gives up when
  the source changes; the temporary 440 Hz producer is removed.
- Verified with Triple J Hottest: 441344 -> 480375 frames (10.008 s) and
  440320 -> 479260 (9.985 s) per segment; RTP 15000 packets, 0 gaps,
  peak -10 dBFS / RMS -22 dBFS; ring ~4.0 s, 0 underruns over ~50 s;
  heap 422 KB, PSRAM 27.5 MB free.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-25 14:52:19 +10:00
2026-09-23 21:51:44 +10:00

aes67-ESP32-P4

AES67 sender for the Waveshare ESP32-P4-ETH (PoE): Spotify Connect and HLS/m3u8 streams out as an AES67 multicast stream, PTP-locked, with a simple web UI for settings and SDP export.

  • docs/aes67-core-base.md — reusable AES67 core design (PTP, RTP, SDP/SAP, VLAN, syslog, web UI contract)
  • docs/hardware-and-design-notes.md — board details and project-specific design
  • web/index.html — web UI (served by the device)
  • CLAUDE.md — working rules and build order

Status: design complete, firmware not started. See the build order in CLAUDE.md.

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