@ -10,21 +10,19 @@ This is the only transcoder that will work with the [URF reflector](https://gith
This software is loosely based on LX3JL's **ambed**, but is easily different enough to be considered an entirely original work. Here are some major differences with ambed:
- tcd uses both hardware-based and software-based vocoders, providing a bridge between the closed source vocoders used in DStar, DMR and YSF and open-source vocoders used in M17 (Codec2) and P25 (IMBE).
- tcd uses both hardware-based and software-based vocoders, providing a bridge between the closed source vocoders used in DStar, DMR NXDN and YSF and open-source vocoders used in M17 (Codec2) and P25 (IMBE).
- *UNIX Sockets* are used to communicate between the reflector and this transcoder. This greatly simplifies the code and significantly improves transcoding performance.
- Each configured module has a dedicated encoding and decoding instance running on a different thread. This prevents overloading when processing multiple voice streams and provides the best possible performance for the reflector's clients.
## Constraints and Requirements
This branch uses only one 300x device for the AMBE+(DStar) codec.
Currently, this program must be run locally with its paired URF reflector. Remote transcoding is not yet supported.
Only systemd-based operating systems are supported. Debian or Ubuntu is recommended. If you want to install this on a non-systemd based OS, you are on your own. Also, by default, *tcd* is built without gdb support.
The P25 IMBE software vocoder library is available [here](https://github.com/nostar/imbe_vocoder). See its README.md file for instructions for compiling and installating this library.
If you are running tcd on an ARM-base processor, you can opt to use a software-based vocoder library available [here](https://github.com/nostar/md380_vocoder). This library is used for the AMBE+2 (DMR/YSF/NXDN) codec. If you are going to use this library, *tcd* must run on an ARM platform like a RPi.
If you are running tcd on an ARM-base processor, you can opt to use a software-based vocoder library available [here](https://github.com/nostar/md380_vocoder) for DMR/YSF vocoding. This library is used for the AMBE+2 (DMR/YSF/NXDN) codec. If you are going to use this library, *tcd* must run on an ARM platform like a RPi. Using this software solution means that you only need one DVSI device to handle D-Star vocoding.
The DVSI devices need an FTDI driver which is available [here](https://ftdichip.com/drivers/d2xx-drivers). It's important to know that this driver will only work if the normal Linux kernel ftdi_sio and usbserial drivers are removed. This is automatically done by the system service file used for starting *tcd*.
Tom Early
3 years ago