diff options
Diffstat (limited to 'archives/extend/2014-September/000465.html')
| -rw-r--r-- | archives/extend/2014-September/000465.html | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/archives/extend/2014-September/000465.html b/archives/extend/2014-September/000465.html new file mode 100644 index 00000000..66ac7abc --- /dev/null +++ b/archives/extend/2014-September/000465.html @@ -0,0 +1,137 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> + <HEAD> + <TITLE> [99s-extend] Newbie, Cowboy + Websocket + Audio Recording + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" 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"> + <META NAME="robots" CONTENT="index,nofollow"> + <style type="text/css"> + pre { + white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ + } + </style> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="000461.html"> + <LINK REL="Next" HREF="000466.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <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 + </A><BR> + <I>Mon Sep 29 18:52:16 CEST 2014</I> + <P><UL> + <LI>Previous message: <A HREF="000461.html">[99s-extend] :binding doc +</A></li> + <LI>Next message: <A HREF="000466.html">[99s-extend] Newbie, Cowboy + Websocket + Audio Recording +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#465">[ date ]</a> + <a href="thread.html#465">[ thread ]</a> + <a href="subject.html#465">[ subject ]</a> + <a href="author.html#465">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<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. +-------------- next part -------------- +An HTML attachment was scrubbed... +URL: <<A HREF="http://lists.ninenines.eu/archives/extend/attachments/20140929/84fe21a4/attachment.html">http://lists.ninenines.eu/archives/extend/attachments/20140929/84fe21a4/attachment.html</A>> +</PRE> + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="000461.html">[99s-extend] :binding doc +</A></li> + <LI>Next message: <A HREF="000466.html">[99s-extend] Newbie, Cowboy + Websocket + Audio Recording +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#465">[ date ]</a> + <a href="thread.html#465">[ thread ]</a> + <a href="subject.html#465">[ subject ]</a> + <a href="author.html#465">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="https://lists.ninenines.eu/listinfo/extend">More information about the Extend +mailing list</a><br> +</body></html> |