[mplayerosx-devel] [PATCH] vo_macosx: use mmap instead of shmat for MPlayerOSX
nicolas.plourde at gmail.com
Thu Oct 23 03:43:12 CEST 2008
On 12-Oct-08, at 5:32 PM, Adrian Stutz wrote:
> MPlayerOSX and vo_macosx use shmget and shmat for the internal video
> to get the video image to the GUI process.
> OSX globally limits the shared memory to 4MB and if other applications
> already use shared memory mplayer fails to initialize vo_macosx.
> Steps to reproduce:
> Either make an application use up most of the shared memory or lower
> limit using:
>> sudo sysctl -w kern.sysv.shmall=1
> (reset back to default with "sudo sysctl -w kern.sysv.shmall=1024")
> Then try to play a video with MPlayerOSX with the internal video
> Audio starts to play but there's no video. In the console following
> gets repeated:
>> vo_mplayer shmget: : Cannot allocate memory
>> FATAL: Cannot initialize video driver.
> Solution (see attached patches):
> Use shm_open and mmap instead of shmget and shmat.
> This seems to be recommended by Apple over shmat and works even with
> the low
> limit set above.
> I'm not versed in this an made the patch mostly based on the example
> I've tested it on Leopard and will try to test it on Tiger next week.
> The idea of this patch comes from the bug report by Camillo Lists:
> mplayerosx-devel mailing list
> mplayerosx-devel at mplayerhq.hu
look good on 10.5 x86, I will apply in mplayerosx branch when its
commited to mplayer.
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