strict receiver target
Sustained through ALSA mmap/DMA, I²S and PCM5122 with a maximum runtime ALSA queue of 34 frames, or 0.71 ms.
OPEN-SOURCE REFERENCE PROJECT
StagePi.
AES67 to a real output.
An off-the-shelf Linux stagebox reference built around Raspberry Pi 4 and a HiFiBerry PCM5122 DAC. It makes the physical receiver path visible—from Ethernet and PTP to I²S and analog output.
AES67 SOURCEConsole / sender48 kHz stereo RTP/L16
PTP + RTPSTAGEPI · LINUXRaspberry Pi 4
PCMReceiver→ALSA / I²S
PHYSICAL OUTPUTHiFiBerryTI/Burr-Brown PCM5122
SAME OFF-THE-SHELF HARDWARE
The receiver path changes the usable profile.
For a one-stereo-sink stagebox, density is not the question. The practical result is whether the complete software path can hold the desired receiver target through the physical device.
SAMEHW
practical physical profile
On the tested StagePi-class hardware, both existing paths required a higher practical device-output profile because their ALSA delivery queues exceeded the strict 1 ms target.
These are receiver and device-delivery observations. No analog output-edge or end-to-end acoustic latency was measured.
WHY STAGEPI MATTERS
A transparent path OEM teams can inspect.
The public project is useful as a reproducible physical-audio reference and as an example of the same Cortex-A72 processor class used in the benchmark program. Commercial Bama Box technology is portable to comparable Linux SoCs, including NXP i.MX families, through the OEM integration API.
OPEN HARDWARE REFERENCEMEASURED PHYSICAL PATHOEM SOC EVALUATION
FROM REFERENCE TO PRODUCT
Benchmark your target platform Test the same receiver target on your hardware.
Bring the SoC, NIC, timestamp source and audio interface. We will define a confidential evaluation.