Bas, Thank you for your information. Could you please let me know where is the allocation of 24 buffers in mediaplayer service? I can't find it... :(
On 2/9/09, baskar rajagopal <[email protected]> wrote: > > Hi Andy, > > check the below > > 1. How much memory you are allocating for a client? In the original code > they might allocate 1Mb of memory in the client heap - i.e., for 32 tracks > and 8 buffer each of 4Kb size. If you are using only one track you can > reduce this memory allocation. > > 2. In the current desing , even though it is mentioned 8 buffers of 4 Kb > size per track , but from the mediaplayer services it is made as 24 buffers > of 4 Kb per track ( this is for emulator ) , if you are using for target , > you can make it as 8 buffers per track. > > > regards, > bas. > > > On Sun, Feb 8, 2009 at 4:34 PM, Andy Quan <[email protected]> wrote: > >> Hi, >> I am working on android multimedia on an ARMv5TE compatible chip with >> hardware SIMD acceleration (CPU 600Mhz, 32K I$/D$, no L2$, 130Mhz external >> DDR, 128MB DRAM). With some performance calibration codes, I find that >> "audio flinger" thread costs around 50Mhz - 60Mhz when music player is >> playing any 44Khz - 48Khz sample rate stereo audio (single track). This is >> much higher beyond my expectation (20Mhz - 30Mhz). >> >> In my understanding, major cost of audio flinger should be resampling, >> mixing, alsa rendering and some data copy. >> 1. And I have confirmed that my testing case does not require resampling, >> that is, a simple mixing and rendering will lead to the end. >> 2. I have confirmed that on this platform alsa rendering does not need so >> many cycles as I observed. >> >> Anybody can help me understand why this audio flinger thread costs so many >> Mhz? Or did I misunderstand anything? I guess I did not catch the bottleneck >> of this audio flinger:) >> >> BTW, my code base is based on the one by the end of last year, so I am not >> sure if there is any performance related update in the current release. >> >> -- >> Thanks, >> Andy >> >> >> >> -- Thanks, Andy --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "android-framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-framework?hl=en -~----------~----~----~----~------~----~------~--~---
