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<H1>[99s-extend] Newbie, Cowboy + Websocket + Audio Recording</H1>
<B>Juan Matías</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Newbie%2C%20Cowboy%20%2B%20Websocket%20%2B%20Audio%20Recording&In-Reply-To=%3CCA%2Bycm%3D6T4gu%3D48%3DVfP3aiVdJFAg--s%2BxGaT2RtGm1KU8qyLiTw%40mail.gmail.com%3E"
TITLE="[99s-extend] Newbie, Cowboy + Websocket + Audio Recording">jmrepetti at gmail.com
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<I>Mon Sep 29 18:52:16 CEST 2014</I>
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<PRE>Hello list, I hope this is the right place to ask this.
I'm learning Erlang, and I wanted to create a Cowboy app to record audio
from a web browser.
Based on the websocket example in the Cowboy source code, I get the user
mic input and send this input to the websocket.
I created a "recorder" module, which functionality is to save the data to
the a file.
*#rawe_handler.erl*-module(rawec_handler).
-behaviour(cowboy_websocket_handler).
......
init(_, _, _) ->
case whereis(recorder) of
undefined ->
RecorderPid = recorder:start(),
register(recorder, RecorderPid);
_ -> ok
end,
{upgrade, protocol, cowboy_websocket}.
.....
websocket_handle(_Frame, Req, State) ->
RecorderPid = whereis(recorder),
RecorderPid ! {rec, _Frame/binary},
{ok, Req, State}.
*#recorder.erl*
-module(recorder).
-export([start/0, recorder_fun/1]).
-compile([debug_info]).
recorder_fun(IoDevice) ->
receive
{rec, Data} ->
ok = file:write(IoDevice, Data),
io:format(Data),
recorder_fun(IoDevice);
{stop, _} ->
%%Close file
file:close(IoDevice)
end.
start() ->
{ok, IoDevice} = file:open("/tmp/test_binary.wav", [write,
binary]),
spawn(recorder, recorder_fun, [IoDevice]).
When I start the console, and allow the microphone on the browser, I see
this error on the console:
=ERROR REPORT==== 29-Sep-2014::18:13:03 ===
Ranch listener http had connection process started with
cowboy_protocol:start_link/4 at <0.178.0> exit with reason:
*{[{reason,badarith},{mfa,{rawec_handler,websocket_handle,3*}},{stacktrace,[{rawec_handler,websocket_handle,3,[{file,"src/rawec_handler.erl"},{line,35}]},{cowboy_websocket,handler_call,7,[{file,"src/cowboy_websocket.erl"},{line,588}]},{cowboy_protocol,execute,4,[{file,"src/cowboy_protocol.erl"},{line,435}]}]},{msg,{binary,<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0....(ETC,
DATA STREAM CONTINUES)
Probably my approach to do this is totally wrong. I there any obvious
problem here?
Can someone point me to a right direction?. Maybe I should write directly
to a file in the *websocket_handle *funcion, but how can I keep a file
opened during the streaming?
The github repo is here: <A HREF="https://github.com/jmrepetti/rawec">https://github.com/jmrepetti/rawec</A> with the whole
source code if you want to take a look.
Thanks in advance,
Matias.
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