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M17 - Make Input Rate Configurable via -M M17 User String.

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lwvmobile
2024-03-15 11:31:33 -04:00
parent 379cc25099
commit ad1db34c86
4 changed files with 31 additions and 16 deletions
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examples/Example_Usage.md
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@@ -296,7 +296,7 @@ You can use the experimental M17 Voice Stream and Packet encoder with the follow
Encode/Decode Local Feedback Voice Stream (Single Session):
`dsd-fme -fZ -i pulse -o pulse -M M17:3:SP5WWP:BROADCAST`
`dsd-fme -fZ -i pulse -o pulse -M M17:3:SP5WWP:BROADCAST:48000`
Using the `-8` option (raw audio monitor) will instead send encoded raw audio to output instead of decoded audio. For example,
@@ -304,7 +304,7 @@ To send a voice stream out of stdout into SOCAT TCP to a second/remote DSD-FME s
Encode:
`dsd-fme -fZ -8 -i pulse -M M17:9:LWVMOBILE:DSD-FME -o - | socat stdio tcp-listen:7355,forever,reuseaddr`
`dsd-fme -fZ -8 -i pulse -M M17:9:LWVMOBILE:DSD-FME:48000 -o - | socat stdio tcp-listen:7355,forever,reuseaddr`
Decode:
@@ -323,4 +323,10 @@ SMS Packet Encoder (over SOCAT TCP):
Many combinations of input and output can be used as well, and using features like raw audio saving with `-6 m17str.wav` will save a wav file of your encoded audio to be replayed later with `-i m17str.wav`
Also note, features function similarly, like -Z for payload, and input options include pulse, oss, stdin, rtl, tcp, etc, using those as the mic in for voice encoding. With the right setup of input/output/input using SOCAT TCP pipes, it is conceivable to use DSD-FME to convert analog audio from NFM into M17 audio, or even change another digital format supported by DSD-FME into M17 audio, if desired (purely for research and fun purposes). Ncurses terminal will function with internal encoder/decoder and wav file creation, with toggle encode/tx with `\` key, but will not function with stdout properly.
The `-M` switch is used to specify user M17 variables, the string is in the format of M17:CAN:SRC:DST:INPUT_RATE.
CAN 1-15; SRC and DST have to be no more than 9 UPPER base40 characters.
BASE40: ' ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/.'
Input Rate Default is 48000; Use Multiples of 8000 up to 48000.
Values not entered into the M17: string are set to default values. M17:7:DSD-FME:DSD-FME:48000
Information on this section will be updated as features are added or modified, etc. If you need help with a particular function and can't find a suitable answer, always open a new issue here, or make contact on the radio reference forum for additional examples, guidance, ideas, help, etc.