We want to design a 3D spatial sound headphone that can position audio objects into a 3D space.
For this product we need eARC audio input from HDMI. Can we extract the eARC audio from HDMI using a NXP MCU? We noticed that the i.MX Audio Board supports HDMI input with eARC support. But it is not clear how audio is extracted form this HDMI.
Actually we do not want to use Linux. Linux on a headphone seems to lot of overkill to us. From the Linux document it is also not clear how eARC audio is getting into the MCU. We did study the evaluation board schematics. Is it correct that to get the audio from a HDMI connection (eARC) info the MCU an extra extraction board is needed with an FPGA that does the extraction?
In i.MX8MP the eARC is controlled by Cortex-A core and if you need to control it from Cortex-M, the only way to do it is using RPMSG, there is no need of a FPGA to transfer this data.
Actually our question is not about the Audio Board. We just noticed that that board my have eARC input, which is an indication that NXP supports this somehow. We do not have this board and are not planning to buy it.
The main question is: How can we get eARC audio into a NXP MCU (iMX8M or RT117x like devices)?
