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Diffstat (limited to 'op25/gr-op25_repeater/apps/README')
| -rw-r--r-- | op25/gr-op25_repeater/apps/README | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/op25/gr-op25_repeater/apps/README b/op25/gr-op25_repeater/apps/README index cb98191..f02f687 100644 --- a/op25/gr-op25_repeater/apps/README +++ b/op25/gr-op25_repeater/apps/README @@ -54,28 +54,29 @@ the mail list. EXTERNAL UDP AUDIO SERVER ========================= -Because the GR block no longer outputs audio samples the audio is routed -via UDP instead. After starting rx.py in a separate terminal window run +Starting rx.py with the "-w -W host" options directs udp audio data to +be sent over the network to the specified remote host. It can then be +received and played back with either of the following methods: +1. Execute ./audio.sh on a remote machine equipped with python2.7, + libasound.so.2 and the sockaudio.py file. +-or- +2. Execute the command: nc -kluvw 1 127.0.0.1 23456 | aplay -c1 -f S16_LE -r 8000 -Notes: -1. Each time rx.py is restarted you must also restart the audio server -(change to the terminal window where the server is running and hit Ctrl-C, -then up-arrow, then Enter). +NOTE: audio underruns are to be expected when using nc | aplay as the +pcm stream is interrupted every time a radio transmission ends. The +sockaudio player is designed to handle this more gracefully, and generally +only underruns due to high cpu utilization or reception/decoding errors. -2. When doing audio output it is no longer necessary to specify the -"-V" option in rx.py. However for now as a hack it's necessary to -give the "-w" (wireshark) rx.py option. If/when the hack is removed and -wireshark is fixed it will no longer be necessary to use "-w". The "-2" -option is still required when using phase 2/TDMA. +INTERNAL AUDIO SERVER +===================== +Starting rx.py with the "-U" command line option enables an internal udp +audio server which will play received audio through the default ALSA +device. Optionally you may specify which ALSA device to use by setting +the "-O audio_out" option along with "-U". -3. If the use of "aplay" in this manner causes no problems (including -running in a VM, etc), the command will eventually be rolled into rx.py -and it will no longer be necessary to run the server manually in this -way. Reports are needed from VM users both with and without pulse, and -Phase II/TDMA users - -4. "aplay" is in package "alsa-utils" and "nc" in "netcat-openbsd" +As of this writing (Aug 2017) it is still necessary to specify the "-w" +(wireshark) option if using either the internal or external audio server. PLOT MODES ========== |