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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%3D5YMMKFpZnfGrOBLu5Jn4WFAiX7BmwbKBti2YsVmJ5JjQ%40mail.gmail.com%3E"
TITLE="[99s-extend] Newbie, Cowboy + Websocket + Audio Recording">jmrepetti at gmail.com
</A><BR>
<I>Tue Sep 30 12:38:15 CEST 2014</I>
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<PRE>Thanks, that fixed the error. Now I'm having other but I'll investigate.
On Tue, Sep 30, 2014 at 12:53 AM, Eduardo Gurgel <<A HREF="https://lists.ninenines.eu/listinfo/extend">edgurgel at gmail.com</A>> wrote:
><i> Looking on the output it says:
</I>><i>
</I>><i> *{reason,badarith} *on this line:
</I>><i>
</I>><i> RecorderPid ! {rec, _Frame/binary},
</I>><i>
</I>><i> This may help you somehow.
</I>><i>
</I>><i> BTW, variables starting with _ are usually used to show unused variables
</I>><i> and stop warnings from the compiler.
</I>><i>
</I>><i> On 30 September 2014 05:52, Juan Matías <<A HREF="https://lists.ninenines.eu/listinfo/extend">jmrepetti at gmail.com</A>> wrote:
</I>><i>
</I>>><i> Hello list, I hope this is the right place to ask this.
</I>>><i>
</I>>><i> I'm learning Erlang, and I wanted to create a Cowboy app to record audio
</I>>><i> from a web browser.
</I>>><i>
</I>>><i> Based on the websocket example in the Cowboy source code, I get the user
</I>>><i> mic input and send this input to the websocket.
</I>>><i>
</I>>><i> I created a "recorder" module, which functionality is to save the data to
</I>>><i> the a file.
</I>>><i>
</I>>><i>
</I>>><i> *#rawe_handler.erl*-module(rawec_handler).
</I>>><i> -behaviour(cowboy_websocket_handler).
</I>>><i> ......
</I>>><i> init(_, _, _) ->
</I>>><i> case whereis(recorder) of
</I>>><i> undefined ->
</I>>><i> RecorderPid = recorder:start(),
</I>>><i> register(recorder, RecorderPid);
</I>>><i> _ -> ok
</I>>><i> end,
</I>>><i> {upgrade, protocol, cowboy_websocket}.
</I>>><i> .....
</I>>><i> websocket_handle(_Frame, Req, State) ->
</I>>><i> RecorderPid = whereis(recorder),
</I>>><i> RecorderPid ! {rec, _Frame/binary},
</I>>><i> {ok, Req, State}.
</I>>><i>
</I>>><i> *#recorder.erl*
</I>>><i> -module(recorder).
</I>>><i>
</I>>><i> -export([start/0, recorder_fun/1]).
</I>>><i> -compile([debug_info]).
</I>>><i>
</I>>><i> recorder_fun(IoDevice) ->
</I>>><i> receive
</I>>><i> {rec, Data} ->
</I>>><i> ok = file:write(IoDevice, Data),
</I>>><i> io:format(Data),
</I>>><i> recorder_fun(IoDevice);
</I>>><i> {stop, _} ->
</I>>><i> %%Close file
</I>>><i> file:close(IoDevice)
</I>>><i> end.
</I>>><i>
</I>>><i> start() ->
</I>>><i> {ok, IoDevice} = file:open("/tmp/test_binary.wav", [write,
</I>>><i> binary]),
</I>>><i> spawn(recorder, recorder_fun, [IoDevice]).
</I>>><i>
</I>>><i>
</I>>><i> When I start the console, and allow the microphone on the browser, I see
</I>>><i> this error on the console:
</I>>><i>
</I>>><i> =ERROR REPORT==== 29-Sep-2014::18:13:03 ===
</I>>><i> Ranch listener http had connection process started with
</I>>><i> cowboy_protocol:start_link/4 at <0.178.0> exit with reason:
</I>>><i> *{[{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,
</I>>><i> DATA STREAM CONTINUES)
</I>>><i>
</I>>><i> Probably my approach to do this is totally wrong. I there any obvious
</I>>><i> problem here?
</I>>><i> Can someone point me to a right direction?. Maybe I should write directly
</I>>><i> to a file in the *websocket_handle *funcion, but how can I keep a file
</I>>><i> opened during the streaming?
</I>>><i>
</I>>><i> The github repo is here: <A HREF="https://github.com/jmrepetti/rawec">https://github.com/jmrepetti/rawec</A> with the
</I>>><i> whole source code if you want to take a look.
</I>>><i>
</I>>><i>
</I>>><i> Thanks in advance,
</I>>><i> Matias.
</I>>><i>
</I>>><i> _______________________________________________
</I>>><i> Extend mailing list
</I>>><i> <A HREF="https://lists.ninenines.eu/listinfo/extend">Extend at lists.ninenines.eu</A>
</I>>><i> <A HREF="https://lists.ninenines.eu/listinfo/extend">https://lists.ninenines.eu/listinfo/extend</A>
</I>>><i>
</I>>><i>
</I>><i>
</I>><i>
</I>><i> --
</I>><i> Eduardo
</I>><i>
</I>
--
Matías
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