2014/10/15 下午 10:10:56

iphone Programming Glossary: latency

http://stackoverflow.com/questions/1002838/audio-on-the-iphone

Ultimately I got my instrument working beautifully with multi note polyphony looped samples no popping and minimal latency. Unfortunately RemoteIO is not well documented. Michael Tyson was one of the first in the field to write about RemoteIO..

iOS Detecting connection speed or type [duplicate]

http://stackoverflow.com/questions/10719073/ios-detecting-connection-speed-or-type

question If you really need to know you will have to test for it. Setup a connection to a known server that has low latency. In a separate thread mark the time Time A and send a packet make sure it's one packet . Wait on that thread. Mark the time.. packet Time C . Make sure the server response spans at least three packets. Time B Time A is a very rough estimate of latency. Time C Time B is a very rough estimate of bandwidth. Because you want to be accurate as possible use the lowest level of..

iCloud NSUbiquitousKeyValueStore initial sync/access delay - how to handle?

http://stackoverflow.com/questions/12539266/icloud-nsubiquitouskeyvaluestore-initial-sync-access-delay-how-to-handle

with iCloud 2. Is there any way to find out is data not available or just not downloaded yet 3. Is there any known latency of iCloud I've heard about 7 seconds but it's obviously not true. 4. It seems that when app isn't unistalled updates of..

UIViewController. viewDidLoad vs. viewWillAppear: What is the proper division of labor?

http://stackoverflow.com/questions/1579550/uiviewcontroller-viewdidload-vs-viewwillappear-what-is-the-proper-division-of

time you go to the Now Playing view. However when you are loading things from a server you also have to think about latency. If you pack all of your network communication into viewDidLoad or viewWillAppear they will be executed before the user..

Typical UDP latency on iPhone over 3G - are my numbers right?

http://stackoverflow.com/questions/17859732/typical-udp-latency-on-iphone-over-3g-are-my-numbers-right

UDP latency on iPhone over 3G are my numbers right In order to evaluate TCP versus UDP on the iPhone I wrote a small echo server on.. I initially believed something was wrong with the implementation but running it from the simulator give a consistent latency of only 7 ms. Are my numbers right or is something weird going on iphone network programming udp 3g latency share improve.. latency of only 7 ms. Are my numbers right or is something weird going on iphone network programming udp 3g latency share improve this question I saw this link on iphone Wifi latency and I decided to try pumping UDP packets faster...

Receive HTTP Headers via NSURLRequest/NSURLConnection in Cocoa

http://stackoverflow.com/questions/237164/receive-http-headers-via-nsurlrequest-nsurlconnection-in-cocoa

here is that I'm not ready to make synchronous requests via a mobile device especially with a network that has high latency such as EDGE. Is it possible to get similar results with the default asynchronous behavior of NSURLConnection objective..

what is the best way to play sound quickly upon fast button presses xcode?

http://stackoverflow.com/questions/3128283/what-is-the-best-way-to-play-sound-quickly-upon-fast-button-presses-xcode

sound files which might take a short second to buffer you'll have to figure out for yourself if you can live with any latency or not I've never had any issues with it being slow. If it's slow you're probably doing something against Apple's recommendations..

What type of webservice works best with iOS?

http://stackoverflow.com/questions/3152700/what-type-of-webservice-works-best-with-ios

to define performance better. I'm assuming you're referring to network transmission time which means keeping server latency low and number of bytes transmitted low. The ultimate is probably a custom binary wire protocol that's also been analyzed..

iAd error “Ad inventory unavailable”

http://stackoverflow.com/questions/3720459/iad-error-ad-inventory-unavailable

Have I to add an ad by myself or iAd Network automatically sends test ads as in simulator EDIT I think it was a latency problem of the iAd Network server that dispatches the ads. I suppose that when the network had ads for my app it began to..

Can the iPhone4 record from both front and rear-facing camera at the same time?

http://stackoverflow.com/questions/3919807/can-the-iphone4-record-from-both-front-and-rear-facing-camera-at-the-same-time

as it reports a frame stop it and start the second. Then stop the second and start the first ad infinitum. Sadly the latency between requesting a session start and receiving the first frame left me with about one frame every two seconds. Of course..

How should I architect my iPhone app to talk to my website?

http://stackoverflow.com/questions/3943597/how-should-i-architect-my-iphone-app-to-talk-to-my-website

all of those connections but it gets a bit more complex to track the data. Downloading simultaneously might decrease latency considerably making the mechanism much faster for the user. To save the time and bandwidth consider using HTTP's If Modified..

How do I stream video and play it?

http://stackoverflow.com/questions/464732/how-do-i-stream-video-and-play-it

Realtime Audio/Video Streaming FROM iPhone to another device (Browser, or iPhone)

http://stackoverflow.com/questions/5719538/realtime-audio-video-streaming-from-iphone-to-another-device-browser-or-iphone

of CPU and battery . Write your own parser for the H.264 AAC output very hard Record and process in chunks will add latency equal to the length of the chunks and drop around 1 4 second of video between each chunk as you start and stop the sessions..

iphone : how to stop shutter animation?

http://stackoverflow.com/questions/7098236/iphone-how-to-stop-shutter-animation

to using the AVFoundation and getting an AVCaptureVideoPreviewLayer which has no shutter animation but you still get a latency between asking for the feed to start and it starting. I'm no hardware expert but I assume the delay is because the power..

iOS Stream Audio from one iOS Device to Another

http://stackoverflow.com/questions/8357514/ios-stream-audio-from-one-ios-device-to-another

bit more nitty gritty than saying just play back this mp3 or whatever. My experience has been that Audio Unit is lower latency but that Audio Queue is more suited to streaming audio. So I think for you the latter is a better option. A key part of..

Record audio to NSData

http://stackoverflow.com/questions/8485032/record-audio-to-nsdata

Both Audio Queues and the RemoteIO Audio Unit will give you buffers of raw audio in real time with fairly low latency. You can take the buffer pointer and the byte length given in each audio callback to create a new block of NSData. RemoteIO..

NSURLConnection is run many times

http://stackoverflow.com/questions/886810/nsurlconnection-is-run-many-times

CocoaAsyncSocket is your best bet for low level access to the sockets without having to write low level code. Since latency on the cell network can be very bad it's possible that your connection will take longer than 5s to complete. Do make sure..