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• Streaming audio - where to start?

  - by Adam Davis

  I need to develop an embedded audio streaming server. Requirements: Voice quality or better Intended for low power wifi transmission Broad support in existing software and devices (ie, windows media player, quicktime, vlc, iPhone, Android, etc). Royalty/patent free, or cheap to license Preferences: Low overhead TCP/IP based streaming protocol Voice grade codec (easy to implement in software, no DSP, 32bit CPU if needed) Would be nice if it supported HTML5 browsers, but is there any codec (such as raw) that is supported by the latest browsers that is lower overhead than MP3? Therefore: What are the relevant streaming protocols I should be looking at? What are the relevant codecs I should be looking at? What transport streams should I be looking at? What am I missing, or where else should I be looking for this type of need?

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• GKPeerStateAvailable for non existing peers?

  - by Ernest

  Hi, used this website for the long time to find answers, now need to ask on myself! :) I have implemented multi player for my game using GKSession and client/server approach, not using peer picker (up to 4 player allowed). I have one big problem which I can't find solution for. If you disconnect/reconnect server peer quickly enough, client peer will "remember" that host and will show it in the list of all available peers permanently, only turning wifi/bluetooth off resets this. So if I do this 5 times in a row, my client will show 5 available hosts with the same name! Anyone had experience with this? Any idea of workarounds? I should note that requirements for my game is iPhone SDK 3.0 for Bluetooth and 3.1 for Wifi as GKSession supports both now.

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• Anyone knows of a good addressbook implementation?

  - by Tsahi Levent-Levi

  I am looking to add an address book to one of my programs. For that purpose, I want to have something that is flexible and customizable to the point of allowing me to hook up additional metadata to contacts in it from third parties. I don't mind paying for a solution as long as I get something that is usable for me. My requirements: Optimized to run on embedded devices Preferably in source code form Ability to add my own fields to contacts over those the address book provides out of the box Ability to plugin "stuff" to it to enhance it without changing its base code too much Has a C or C++ interface

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• How to write software for my touchpad?

  - by Nona Urbiz

  I have some ideas for improvements on my touchpad, ranging from the run of the mill scroll horizontally at the bottom, tapzones for right click, to more complicated ones. But I have no idea where to get started? I'm working on Windows 7 Home Premium, its an Asus laptop, and I have none of these options natively available to me. Regardless, I want to write something that anyone can use. Where would I start? (it'd be nice to write in c++? is that possible? what are the requirements here? what language would be recommended?)

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• Allow native DLL to output stdout / stderr in c# console application

  - by xaw

  I have a native DLL which outputs via stdout / stderr. I have a C# console application which calls this DLL and outputs binary data to a parent C# application which started the C# console exe, processing stdout / stderr. Currently when I call the C# exe it works just fine (the DLL hooks up to the stdout of my console application and puts its data in just fine). Is this by design (and shouldn't be broken in future .NET framework versions)? Are there limitations on my managed code's deployment with this strategy (full-trust, permission requirements, GAC issues, etc)? I can't seem to find any documentation about stdout with a managed exe and an unmanaged dll both putting data in that standard output on MSDN. Thanks,

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• What language/API to use for a standalone live-input audio visualizer app?

  - by knuckfubuck

  I develop with Actionscript and was glad to see that AIR 2.0 was going to give access to mic input data. I planned to use this to create a visualizer set to the tempo of the incoming live audio. After doing a few days of google research it seems unlikely that it will be possible to analyze the data of the mic input in Flash/AIR. If anyone has ideas on how I can achieve this in AIR please let me know. (I'm open to workarounds.) That being said, I don't want to give up on the idea so I'm interested in suggestions for other language/API to use. My requirements for the app are: Run on OSX Two windows - one that can go fullscreen while the other(controller GUI) stays put Able to access live mic input data I've done reading on FFT and understand what needs to be done on the sound side so no need to help with that.

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• Multiple xmlns attributes affect page performance?

  - by Geuis

  We are working on adding some Facebook Connect functionality to our site. Part of their requirements for FB Connect require adding several additional xmlns attributes to the html element. We are likely going to have 5 or 6 of their custom attributes by the time we're done, and I want to know if this will negatively affect our page performance. I.e. will these be additional resources that the browser has to download? I have checked in Firebug and I don't see additional requests, but I don't know if that is because requests are not made by the browser, or if Firebug simply doesn't track them.

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• How to Transition to Scrum

  - by mcass20

  My team has grown fairly quickly from 1 to 5 over the last year or so and are very interested in changing our development style from Waterfall to a more iterative approach like Scrum. We work for a University and specialize in CRUD web apps for internal customers who are always changing requirements along the way. So, my question is...How do we best implement Scrum techniques? Supplemental concerns: Is it recommended to quit Waterfall "cold turkey" in order to facilitate the transition or do you feel a progressive approach is more effective? In other words, pick and choose some scrum techniques to implement now and add others further down the road?

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• WCF passing data types

  - by Jonathan D

  writing a WCF soap server which is going to be working with a flex client. what the best way of passing the result of a sql select statement? with pro's and con's would be good :D I know I can define data contracts, however defining lots of these for every sql statment is going to take a long time. i'm doing this with SQL server 2000, VS2010 and flex sdk 3/4. apart form that there isn't really that many other requirements that couldn't be moved at present. Thanks for the help

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• What are your build and release steps? When to increment build numbers?

  - by Ed

  I am having trouble defining and automating my build process despite simple requirements: Every build should have a unique build number. Every tagged release should be reproducible What I have: A C++, Red Hat Enterprise Linux 5.x, Subversion development environment. A build machine ( actually a virtual machine ) A version.h file with #defines for major, minor, and buildnumber. A script for incrementing the version.h buildnumber. A rpmbuild spec file that exports the tagged Subversion source, builds, and makes the rpm installer packages. Questions: Assuming multiple developers per project, when should the build number be incremented and version.h file be checked-in? The build machine? Some sort of Subversion hook? Pre-build or post-build? Thanks in advance for those willing to take the time to share their experience with build processes. -Ed Linux newbie. Former Windows C++/.NET developer.

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• Which distribution website should I pick for my open-source package?

  - by Frank

  I wrote an open-source software package, which I'd like to publish (using Apache 2 license). I see various options for how/where to publish/host it: Get my own domain and put it there Put it on Sourceforge Put it on Google Code Put it on Freshmeat ...? What are your experiences / recommendations? What's the current trend among software developers? My only requirements are that I ... can add my own logo on the website can put up some documentation there, get a nice URL that is easy to remember get SVN support (I would also be fine with just uploading a tarball for each new version, it just shouldn't force me to use CVS or any other version control system I'm not familiar with) and of course, the site shouldn't take ownership in the code etc. oh, and it should be free (ok, for registering my own domain I'll be willing to pay a little bit)

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• Image bit depth values.

  - by pencilslate

  REPHRASED QUESTION: I am coming up with a list of possible image bit depth values that could be used as a predefined reference list in my application. I could think of 8,16,24 and 32 bit depths. The image formats considered are BMP, JPEG, PNG and GIF. I understand the bit depth decides the quality and thereby the storage requirements for the image. The application is used to store user uploaded images(non-medical, non-DICOM). Are there more bit depths other than the ones mentioned above that i should be including in my list? Are there any stats on the usage of the images with bit depths? Appreciate your response!

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• CPU and Data alignment

  - by MS

  Dear All, Pardon me if you feel this has been answered numerous times, but I need answers to the following queries! Why data has to be aligned (on 4 byte/ 8 byte/ 2 byte boundaries)? Here my doubt is when the CPU has address lines Ax Ax-1 Ax-2 ... A2 A1 A0 then it is quite possible to address the memory locations sequentially. So why there is the need to align the data at specific boundaries? How to find the alignment requirements when I am compiling my code and generating the executatble? If for e.g the data alignment is 4 byte boundary, does that mean each consecutive byte is located at modulo 4 offsets? My doubt is if data is 4 byte aligned does that mean that if a byte is at 1004 then the next byte is at 1008 (or at 1005)? Your thoughts are much welcome. Thanks in advance! /MS

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• How to structure class to support imported 3d model ?

  - by brainydexter

  Hello, I've written a C++ library that reads in this 3d model file (collada DAE). uptil now, I would output a list of triangles and handle each at rendering stage. But now, I need to attach some Bounding sphere information with the imported model. I need some advice on how should I organize this in code. Here are some specs of the 3D file format: - 3D model is represented as a Tree consisting of nodes - each node can contain other nodes, geometry information, transformation etc My requirements: - a bounding sphere associated with each node, thereby yielding a tree of bounding sphere hierarchy for the model itself. - actual vertex information What would be the recommended way to deal with this situation? Thanks

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• Finding the best folder for all users on a Windows machine

  - by reallyjoel

  We are making a game which will add a level editor feature soon. We want the user to be able to put levels he's downloaded in a folder and then play it in the game, without any hassle. So, we're looking for a folder that anybody can find, open, write, read, and is multiuser. On Windows Vista / 7, the folder /Users/Public/ look like a great candidate. However, It's not listed in the .net enum System.Environment.SpecialFolder. I have went through them all, and checked what they yield on different Windows versions, and none live up to my requirements. I did find Environment.SpecialFolder.CommonApplicationData, that kinda works, but that folder is hidden (C:\ProgramData) and I assume most users don't display hidden folders. As it stands now, it looks like we'll have to settle for the personal documents folder, but we'd really like a multi user folder? Anyone have any tips? (Hard coding c:\Users\Public\ is out of the question, it will only work on english systems)

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• What was the most surprising failure of your 'Engineer's intuition'?

  - by Bubba88

  Hi! This may seem as an open-ended question but I'll surely accept the most impressive and upvoted answer ;) Basically, I could describe my own case - I just fail 5 times a day with my intuition cause very frequently I can be just not up-to-the-speed with my requirements/manager/team/etc. and I just have to make code quickly - that's why proper formalization in many cases stands aside. I want to gather some experience of yours - what was the most epic failure when you did rely on you implicit reasoning/intuitive knowledge/immediate perception etc. of course everything you describe should be related to programming/computers. It's mostly just to measure the danger of using that 'it's obvious..' words. I've made it com. wiki to be properly transformed after gathering enough views count. Thank you!

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• ORM solutions (JPA; Hibernate) vs. JDBC

  - by Grasper

  I need to be able to insert/update objects at a consistent rate of at least 8000 objects every 5 seconds in an in-memory HSQL database. I have done some comparison performance testing between Spring/Hibernate/JPA and pure JDBC. I have found a significant difference in performance using HSQL.. With Spring/Hib/JPA, I can insert 3000-4000 of my 1.5 KB objects (with a One-Many and a Many-Many relationship) in 5 seconds, while with direct JDBC calls I can insert 10,000-12,000 of those same objects. I cannot figure out why there is such a huge discrepancy. I have tweaked the Spring/Hib/JPA settings a lot trying to get close in performance without luck. I want to use Spring/Hib/JPA for future purposes, expandability, and because the foreign key relationships (one-many and many-many) are difficult to maintain by hand; but the performance requirements seem to point towards using pure JDBC. Any ideas of why there would be such a huge discrepancy?

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• Web Setup Project - Getting the Current Machine Name

  - by Shane Kenney

  I've got a web setup project with a custom screen in it that asks for a machine name. Is there anyway to prepopulate this field with the current machines name? For the case that I need it for just including "Localhost" does not meet my requirements. "Environment.MachineName" will return the machine name within a code block which would be fine if I was needing it in a custom action. But it seems custom actions don't excecute until after you go through the installation wizard... So I cant actually use it. Anyway let me know what you think.

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• What are some good books on software testing/quality?

  - by mjh2007

  I'm looking for a good book on software quality. It would be helpful if the book covered: The software development process (requirements, design, coding, testing, maintenance) Testing roles (who performs each step in the process) Testing methods (white box and black box) Testing levels (unit testing, integration testing, etc) Testing process (Agile, waterfall, spiral) Testing tools (simulators, fixtures, and reporting software) Testing of embedded systems The goal here is to find an easy to read book that summarizes the best practices for ensuring software quality in an embedded system. It seems most texts cover the testing of application software where it is simpler to generate automated test cases or run a debugger. A book that provided solutions for improving quality in a system where the tests must be performed manually and therefore minimized would be ideal.

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• Why do software engineers hate writing documentation?

  - by Stewart Johnson

  I ask because I quite enjoy it! I'm talking about design documentation and implementation notes (NOT user manuals), which are non-existent in most of the codebases I've been handed. I can understand why a developer wouldn't want to write requirements (that's the analyst's job) or the user documentation (that's a technical writer's job) but I don't get why developers hate writing design docs. I don't think I would feel as if I'd finished the job if I only wrote the code and walked away -- mainly because when I've been introduced to code-only situations I've seen how hard it is to figure out what's been done and what the software does. I would hate for people to suffer the same situation when inheriting my code. What makes you loath writing supporting documentation for your code?

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• Spring - disable bind exceptions (for a particular property)

  - by Walter White

  Hi all, In a web application I'm working on using Spring 2.5.6.SEC01, I essentially have an Integer field that takes a number to determine which page to scroll to. The requirements changed, and we no longer want to display an error message, but simply ignore the user's input if they enter an invalid number, say "adfadf". I was reading that you can do that via: TypeMismatch.property=Some New Error Message However, after having tried that, we are still getting the original error message: java.lang.Integer.TypeMismatch=... I only want to disable this message for that given property. How can I do that? I still want binding to occur automatically, I just don't want to hear about it now. Walter

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• Elegant setup of Python logging in Django

  - by Parand

  I have yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple: Different log handlers for different events - that is, I want to be able to log to different files Easy access to loggers in my modules. The module should be able to find its logger with little effort. Should be easily applicable to command-line modules. Parts of the system are stand-alone command line or daemon processes. Logging should be easily usable with these modules. My current setup is to use a logging.conf file and setup logging in each module I log from. It doesn't feel right. Do you have a logging setup that you like? Please detail it: how do you setup the configuration (do you use logging.conf or set it up in code), where/when do you initiate the loggers, and how do you get access to them in your modules, etc.

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• What's the funniest user request you've ever had?

  - by Shaul

  Users sometimes come up with the most amusing, weird and wonderful requirements for programmers to design and implement. Today I read a memo from my boss that we need the "ability to import any excel or access data, irrespective of size, easily and quickly." From the same memo, we have a requirement to "know if anyone unauthorized accessed the system" - as if a hacker is going to leave his calling card wedged between an index and a foreign key somewhere. I think my boss has been watching too much "Star Trek"... :) What's the funniest user request you've ever had?

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• recommendations for rich scalable internet application

  - by Wouter Roux

  I am planning to develop a web application that must perform the following actions: User authentication allow authenticated user to download data from USB device (roughly 5 meg data) upload the data from the USB device to processing server process the data and display the results to the user further requirements/restrictions: the USB driver supports windows (2000, XP, Vista, 7) the application must support IE, Firefox and Chrome the USB driver must be installed when pointing to the web application the first time the USB driver exposes functionality through exported functions in dll scalability and eye candy is important server details: Windows Server 2008 Enterprise x64, IIS 7.0, SQL server 2008 With the limited details specified: What technology would you recommend? (eg silverlight/asp.net mvc/wcf). What practices/patterns/3rd party controls would you recommend?

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• UI Components for Windows Mobile Applications (.NET Compact Framework)

  - by splattne

  Applications which run on mobile devices have special user interface requirements. I think Apple did a great job introducing innovative controls on the iPhone/iPod touch platform. Now, I have to design an application for the Windows Mobile platform using the .NET Compact Framework (Visual Studio 2008). I wonder if there are some commercial or open source UI control sets available which are similar to the iPhone / iPod touch UI elements: Scrolling panels based on gestures Instead of a dropdownlist: a new panel with a large list of items Sliding panels etc. I couldn't find any useful products/code. Maybe there is somebody out there with more experience who could help.

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