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Digital Speech Decoder - Florida Man Edition

This version of DSD is a flavor blend of szechyjs RTL branch and some of my own additions, along with a few tweaks from the LouisErigHerve branch as well. NXDN voice decoding is currently working a lot better, thanks to the latter, although I have yet to explore the expanded NXDN or DMR decoding he has laid out. That is a goal. I have also implemented a few more RTL options, including rtl device gain, PPM error, device index selection, squelch, VFO bandwidth, and a UDP remote that works like the old rtl_udp fork, although its currently limited to changing frequency and squelch. The goal is to integrate this project into EDACS-FM but I also want it to be its own standalone project.

Example Usage - RTL

./dsd -fi -i rtl -o pulse -c 154.9875M -P -2 -D 1 -G 36 -L 25 -V 2 -U 6020 -Y 8

-i rtl to use rtl_fm (default is -i pulse for pulse audio)

-o pulse to set output to pulse audio (is default anyways)

-c Set frequency

-P set PPM error

-D set device index number

-G set device gain (0-49) (default = 0 Auto Gain)

-L set rtl squelch to 25

-V set RTL sample 'volume' multiplier

-U set UDP port for rtl_fm remote control

-Y 8 set rtl VFO bandwidth in kHz, (default = 48)(6, 8, 12, 16, 24, 48)

-W Monitor Source Audio (WIP!) (may or may not decode audio if this is on, depending on selected decode type and luck)
(Also, should be noted that depending on modulation, may sound extremely terrible)
(Currently causing Pulse Audio server to restart on Mint, but works in Arch)

Example Pulse Audio Input and Pulse Audio Output, Autodetect Frame Type

./dsd

Yes, it really is this simple now
-fa Auto-detect frame type
sans NXDN or Provoice, need to specify -fp, -fi, or -fn
pulse audio are set as default input and output methods

Example STDIN UDP from GQRX or SDR++, output to Pulse Audio, and save wav files

socat stdio udp-listen:7355 | ./dsd -fi -i - -o pulse -w nxdn.wa

Roadmap

The Current list of objectives include:

~~Random Tinkering~~ More Random Tinkering
Implemented Pulse Audio and ~~Remove PortAudio and~~ Remove OSS, including SOLARIS/APPLE/BSD methods, and Retain PortAudio as Optional (need to re-enable in CMakeLists.txt file)
Improve NXDN and DMR support
More Concise Printouts - Ncurses
~~Improve Monitor Source Audio (if #2 on list is up and working)~~ Not currently playing well with Pulse Audio, need to re-evaluate
Make simple to use installer script.

How to clone, and check out this branch

First, install prerequisites if you haven't built any variety of DSD before.

Check DSD Installation and install the dependencies listed. Also, check the notices and install MBElib if you feel it is necessary.

Simply run these steps to clone and build DSD-FME w/ pulseaudio support.

git clone https://github.com/lwvmobile/dsd-fme
cd dsd-fme
git branch -a
git checkout remotes/origin/pulseaudio
git checkout -b pulseaudio
git branch -a #double check to see if you are on pulseaudio branch
mkdir build
cd build
cmake ..
make

License

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.

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