[mplayerosx-devel] [PATCH] vo_macosx: use mmap instead of shmat for MPlayerOSX

[Diego Biurrun]

On Wed, Oct 22, 2008 at 09:43:12PM -0400, Nicolas Plourde wrote:
>
> On 12-Oct-08, at 5:32 PM, Adrian Stutz wrote:
>
>> 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
>
> look good on 10.5 x86, I will apply in mplayerosx branch when its  
> commited to mplayer.

You are the maintainer, so you need to commit it to MPlayer.  When do
you intend to do this?

Diego