@ -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:
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.
- *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.
- 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
## 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.
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.
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.
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*.
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