Hi all, I am not sure if it is the right place to put my query.. I have some doubts about the Microsoft Audio Compression Manager. As i have to write an ACM driver for my project to support a codec and i found the related document form MSDN. But i am not sure if my ACM driver will be used used by the application or how the application use the ACM driver. Can Audio compression manager API be used by the application or WAVEAPI will be used by the application? How does waveapi select the audio compression manager? Any help or refrence will be appreciated for this. Anil

Anil Kumar

Microsoft has provided new feature as VOIP (voice over IP phone service)in wimdows mobile 6.0. I have some set of questions on this... Can any body tell me if Microsoft also support Video calling via this application? Has microsoft defined any acrchitecture like direct show for this support. Or will it use internally direct show APIs. How does oem integrate this application if they use third party video codecs? Is this application is similar to video telephony? I am sure microsoft has not yet come with video telephony application. They have left it to OEM to make the application using microsoft SDK. Any help of refrence will be helpfull. Anil

Anil Kumar

If you want to generate randomness interms of numbers, then you can add some huge numbers and make overflow in the register. The generated number everytime will be the random number Anil Kumar

Well vivek thats a interesteing work u r going to do. first of all i would like to know what comminication interface you are going to use for it. Is it TCP/IP, UART ,bluetooth or what? Anil Kumar

Hi everybody I am working on embedded systems and came to know about the timer importance in this area. I get puzzled sometime by the software timers, why they are good compare to HArdware timer and interrupts as why they do save the Change in the CPU states. Can anybody educate me on this more. Regards Anil Kumar

Hi guys i sometime get confuse in this? What is the difference between Instance and Context. And how two different instances for the same application work. What are the responsibilities of the OS two maintain the two different instance. What is the responsibility of the Application developer. Thanks in advance. Anil Kumar

I know the Mutex and Semaphore usage in any OS. but not sure of Recursive Mutex and Semaphore. If anybody guide me for this it will be of great help. Anil Kumar

Has some body worked on Video Telephony for 3G Enabled Handset. I just want to know what are the means to achieve Lip Synchronization. Tnaks in Advanced Anil Kumar

Hi Mike, Thanks first for the reply,:-D As you have mentioned that Drift in the system clock is due to not Handling the clock interrupt properly(Not exactly at the programmed time sooner or later). If this is the case then in embedded systems like (Mobile phones and PDAs) where applications are very time critical then it is the responsibility of the RTOS to provide the best Clock or GetTickCOunt functionality. Specialy in my project where i am Handling the Audio/Video Synchronization i can ask my RTOS provider for this or if there is a way to know that drift at software level and compensate it. Any comment will be very useful. Regards Anil Kumar

I have been working on a real time project which is highly dependent on the system clock of PC. But my team members are very much worried of the "Drift in the System Clock"? Can any body give some hint what it is and what are the solutions to come over this problem. Thanks in Advance Anil Kumar

Thanks for all i got the difference. Regards Anil Kumar

Can any body tell me what is video Telephony for 3G and how it works. Regards Anil Kumar

Hey Heiko, Can you exactly tell me how do you measure the Latency. It will be helpfull for me. Regards Anil Kumar

Basically Win32 API also very good to use i found Direct Sound is more complex. And within Win32 u can manage all the audio Signal properties i,e Sampling, Mono or stereo. Data rate call back etc.... Anil Kumar

What is the difference between mutex and semaphore and what are their applications? Anil Kumar

Hi guys what is the best TestHarness Strategy for MObile Plateforms. Anil Kumar

Can anybody tell me what is the strategy of TestHarness for any mobile phone plateform? Anil Kumar

If you could have one more element in the moreStuff structure as like struct morestuff { int[xxx]; int size; } and update the size at the run time and can access this size by the parent structure someStruct to copy the desired amount of data. Hope it may help you some way Regards Anil Kumar

But as per my understanding the structure members are stored in the contigous memory locations for example struct temp { char a, int b, float c, }; if i declare temp *structPtr = 0x00000000 (Address of element a) then what should be the address of element b if it is 0x00000002 then one byte is waisted. According to you b should have address of multiple of 4. So i can say that there is a trade of CPU performance vs Memory usage Am i right please guide me. Regards Anil Kumar

Same problem i faced yesterday and fixed it. In my case i was creating a DISPLAY DC and one Compatible DC and one Bitmap memory through CreateDIBSection API call. hdc = CreateDC("DISPLAY",NULL,NULL,NULL); Bitmap = CreateDIBSection(hdc, pBMI, DIB_RGB_COLORS, (void**)&m_pVideoBits, 0, 0); HDC hSrcDC = CreateCompatibleDC(hdc); SelectObject(hSrcDC, m_hViewfinderBitmap); while Deleting the Bitmap and DC you should follow the following way DeleteDC(hSrcDC); DeleteObject(Bitmap); DeleteDC(hdc); If your code also have some this kind of thing then please take care that, you should not clean a bitmap untill it is attached to the DC Hope i could help you some way. Regards Anil Kumar