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wifiaudio:start
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wifiaudio:start [2015/12/23 14:00] tschulz |
wifiaudio:start [2016/01/04 10:26] tschulz [Wifi Setup] |
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| ===== How it Works ===== | ===== How it Works ===== | ||
| - | * Essentially we are using NETCAT to pipe audio from a mic input on one computer to the audio output of another computer. | + | * Essentially we are using **NETCAT** to pipe audio from a mic input on one computer to the audio output of another computer. |
| - | * It appears that ssh adds a lot of latency around 1-2 secs which is not acceptable more most instances | + | * It appears that **ssh** adds a lot of latency around 1-2 secs which is not acceptable more most instances |
| * Netcat on the receiver need to starts before the transmitter starts to send otherwise the transmitter script will exit with a connection refused. | * Netcat on the receiver need to starts before the transmitter starts to send otherwise the transmitter script will exit with a connection refused. | ||
| ===== Requirements ===== | ===== Requirements ===== | ||
| - | * Alsa needs to be working on both computers and alsa-utils should be installed to save mixer settings | + | * **Alsa** needs to be working on both computers and alsa-utils should be installed to save mixer settings |
| - | * aplay/arecord also need to be installed along with netcat. In most distributions they are installed as base packages | + | * **aplay/arecord** also need to be installed along with **netcat**. In most distributions they are installed as base packages |
| * Obviously some sort of tcp/ip must be running to for the netcat communication to work. | * Obviously some sort of tcp/ip must be running to for the netcat communication to work. | ||
| + | ===== Wifi Setup ===== | ||
| + | |||
| + | <file bash /etc/network/interfaces> | ||
| + | ... | ||
| + | auto wlan0 | ||
| + | iface wlan0 inet dhcp | ||
| + | wpa-ssid ssid | ||
| + | wpa-psk #### | ||
| + | |||
| + | ... | ||
| + | </file> | ||
| + | |||
| + | ===== Audio setup ===== | ||
| + | |||
| + | * By default the usb audio adapter is detected as card 1 not card 0(default). I tried disable the bcm sound module but for some reason that disables the mixer of the usb audio adapter. | ||
| + | * I was able to set the default card using asound.conf | ||
| + | |||
| + | <file bash /etc/asound.conf> | ||
| + | pcm.!default { | ||
| + | type hw | ||
| + | card 1 | ||
| + | } | ||
| + | |||
| + | ctl.!default { | ||
| + | type hw | ||
| + | card 1 | ||
| + | } | ||
| + | </file> | ||
| ====== Receiver ====== | ====== Receiver ====== | ||
| Line 17: | Line 45: | ||
| PORT="8080" | PORT="8080" | ||
| - | RATE="5" | + | RATE="2" |
| - | BUFFER="50" | + | BUFFER="10" |
| FORMAT="cd" | FORMAT="cd" | ||
| Line 28: | Line 56: | ||
| ====== Transmitter ====== | ====== Transmitter ====== | ||
| + | * **RECV_ADDR** will need to changed to something valid like a ip address or a hostname/fqdn. | ||
| <file bash wifi_audo_send.sh> | <file bash wifi_audo_send.sh> | ||
| #!/bin/sh | #!/bin/sh | ||
| PORT="8080" | PORT="8080" | ||
| - | RATE="5" | + | RATE="2" |
| - | BUFFER="50" | + | BUFFER="10" |
| FORMAT="cd" | FORMAT="cd" | ||
| Line 42: | Line 70: | ||
| arecord -B ${BUFFER} -r ${RATE} -f ${FORMAT} | netcat ${RECV_ADDR} ${RECV_PORT} | arecord -B ${BUFFER} -r ${RATE} -f ${FORMAT} | netcat ${RECV_ADDR} ${RECV_PORT} | ||
| </file> | </file> | ||
| + | |||
| + | ====== Price List ====== | ||
| + | |||
| + | [[https://docs.google.com/spreadsheets/d/1jROjZBKDP32I1MQKS9gV2c9oLo5q8K8QiZUgWr6fepo/edit#gid=333349986|Price List]] | ||
| + | |||
| + | ====== Parts List ====== | ||
| + | * Arm Computer | ||
| + | * Wifi Adapter | ||
| + | * Audio Adapter | ||
| + | * Power Supply | ||
| + | * Flash Card (Storage) | ||
| + | |||
| + | ====== Raspberry Pi Issues ====== | ||
| + | * I get this error whenever I try to change either the buffer size, buffer time, or interrupt period on both the R Pi 1 and R Pi 2<file>aplay: set_params:1305: Can't use period equal to buffer size (256 == 256)</file> | ||
| + | * I picked up a C-Media CM108 Chipset usb audio adapter and it fixed the problem. I able to adjust the sample and buffer size [[http://www.amazon.com/External-Adapter-Windows-Drivers-Needed/dp/B00V9E9YRG|Link]] | ||
| + | ====== Other Notes ====== | ||
| + | * The "Chip" microcomputer looks really promising it includes storage, wifi, and audio all on board and is selling for $9. Their website says they will be shipping in June 2016 [[http://getchip.com/]] | ||
wifiaudio/start.txt · Last modified: 2018/11/12 14:01 by tschulz
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