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Closed 9 years ago.
Developing an algorithm that will eventually make its way into an iPhone app. Right now on my 3.4GHz quad core, 8 thread intel processor, the algo takes about 3 seconds. Any way to parlay these numbers to iPhone 4s specs? I've read the processer is 1GHz, but my sense is there is not an apples to apples linear comparison.
Even if you could divide by 32*3.4 it still would be apples to oranges. The iPad uses an ARM processor that has a very different architecture to your intel processor, as well as running on a completely different OS, using different process management techniques. I'm afraid the only way is to just run it on a real device and profile it.
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It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 9 years ago.
I have been investigating the use of the PJSIP SIP stack on a small micro-controller such as the PIC32 MCU and I've come to realise that it may just be possible. I want only the absolute minimal SIP functionality so I just might be able to fit PJSIP on a small MCU. Of course, it's a VERY ambitious project but I'm gonna give it a try anyway. I just can't seem to wrap my mind around the right operating system for use so I'm gonna spend a good couple weeks on this subject. I'm gonna take a look at FreeRTOS. Any thoughts on the compatibility of FreeRTOS with something like PJSIP?
I think the project site itself answers your question:
On portability
On Size
The memory resources suggested would be at the upper end for most on-chip memory. The RTOS's listed are all significantly more fully featured than FreeRTOS which provides little more than thread scheduling, timer services, synchronisation and IPC. You'd need to understand what OS services it assumes. Presumably it uses the platform's network stack? FreeRTOS has no network stack - you'd have to provide that too - more resources again.
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 10 years ago.
Can I use iPhone or iPad device as a server without jail breaking it ?
uPnP server?
Even you have unlimited data plan, or connected to Wi-Fi, it is unwise to make the device as a server. It is not designed to be a server.
But you can still implement the logic of uPnP and give out your device IP for other people to connect to your device. However, intense use of network will cause battery draining fast. You should note that.
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 11 years ago.
We testing our app on simulater is fast but slow on iphone.
We are initializing canvas for drawing and try to draw multiple line on the canvas is very slow.
The simulator runs using the full power of the machine it is running on, it is not an emulator. That's why you can't trust it all the way through a project - every app must be test run on an actual device.
Although this isn't what you have asked for: Don't use phonegap. Please. It employs web technology to make development easier, but web technology is just not as performant as a native application would be. If you need to do extensive graphics operations, consider developing a native app.
Aside from not actually asking a question, you need to consider that the iphone has a much slower processor than what ever you're running the simulator on.
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 11 years ago.
Can I write an operating system using machine language directly?
Please give me a general idea or sources as to how to do it.
First, study the x86 or ARM instruction sets. Then, study up on operating systems. You'll see why it's not a great idea: it's like filling a sandbox one grain at a time with tweezers.
Yes, all you need is a lot of patience, sanity, and a binary editor.
After awhile you will realize why assemblers were created, which is the lowest level I would generally bother going to.
** yes you can but this is very diffecult for any one
and if you do this what make programmers and all design programming lanaguages to make things
easily comparing by machine code
and this is project as you ask
it's an OS written in machine code it's still under developing
http://www.magicschoolbook.com/computing/os-project
note : your name is like my name iam glad to answer you
best wishes**
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Closed 11 years ago.
I am interested in creating an auto tune app and did a bit of research and apparently thats now possible by using accelerometer that apple provides but I have no idea how to do that. can someone help out by giving me a link to a tutorial or give me an example code to change the voice inserted into the function.
Thanks in advance.
The accelerometer reports back physical acceleration of the device. This has absolutely nothing to do with digital signal processing of a recorded waveform, and as others said, there will be no easy way to do this. You can browse the audacity source (plugins specifically) to see algorithms having to do with time-stretching and will see that this is very complex. Not only is the science of the signal processing complicated, the art of getting it to sound good (at all) is incredible.