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mplayerosx-devel@mplayerhq.hu

October 2008

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2 discussions

Re: [mplayerosx-devel] [PATCH] vo_macosx: use mmap instead of shmat for MPlayerOSX
by Adrian Stutz 30 Nov '08

30 Nov '08

On 23-Oct-08, at 12:11, Nicolas Plourde wrote: > Ulion is now maintainer of vo_macosx... Anyway I can commit right away > but I would like Adrian to test on tiger first. Sorry, I didn't CC the last message to mplayerosx-devel: http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2008-October/058768.html The above message has an updated patch attached that's confirmed to work on OSX 10.4. Greetings Adrian

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[PATCH] vo_macosx: use mmap instead of shmat for MPlayerOSX
by Adrian Stutz 27 Oct '08

27 Oct '08

MPlayerOSX and vo_macosx use shmget and shmat for the internal video output 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 the 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 output. Audio starts to play but there's no video. In the console following message 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 here: http://www.opengroup.org/onlinepubs/007908799/xsh/shm_open.html 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: http://bugzilla.mplayerhq.hu/show_bug.cgi?id=1295

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