[Libva] Use libva as user without X

[Thomas Scheuermann]

Hi Gwenole,

Am 08.10.2014 um 11:57 schrieb Gwenole Beauchesne:
> Hi Thomas,
>
> 2014-10-08 11:30 GMT+02:00 Thomas Scheuermann <scheuermann at barco.com>:
>> Hi,
>>
>> how can I use libva as non-root user on a system without X running?
> - Check what group /dev/dri/card<n> or /dev/dri/renderD<n|0x80> belongs to
> - Add your user to that group
My user is in the video group and the device  is:
crw-rw---- 1 root video 226,  0 Oct  8 09:16 /dev/dri/card0
My kernel is 3.14
But it doesn't work.
My system is a debian wheezy with some backports like the kernel.
>
> e.g. on a Ubuntu system, /dev/dri/card0 is in the "video" group. If
> you want a user X to access to the device, just add user X to the
> "video" group too.
>
> Note: starting with Kernel >= 3.15, and with libva from git master,
> you can use the device without authentication. This means that you can
> have user Y logged in, and who has started a display server, while
> still allowing user X to remote connect and use the device.
>
>> If I run vainfo as a non-root user, I get
>>
>> $ vainfo
>> error: XDG_RUNTIME_DIR not set in the environment.
>> error: can't connect to X server!
>> libva info: VA-API version 0.35.1
>> libva info: va_getDriverName() returns 1
>> libva error: va_getDriverName() failed with operation
>> failed,driver_name=i965
>> vaInitialize failed with error code 1 (operation failed),exit
>>
>> If I do the same as root, I get
>>
>> # vainfo
>> error: XDG_RUNTIME_DIR not set in the environment.
>> error: can't connect to X server!
>> libva info: VA-API version 0.35.1
>> libva info: va_getDriverName() returns 0
>> libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
>> libva info: Found init function __vaDriverInit_0_35
>> libva info: va_openDriver() returns 0
>> vainfo: VA-API version: 0.35 (libva 1.3.1)
>> vainfo: Driver version: Intel i965 driver for Intel(R) Haswell Mobile -
>> 1.3.2
>> vainfo: Supported profile and entrypoints
>>        VAProfileMPEG2Simple            :    VAEntrypointVLD
>>        VAProfileMPEG2Simple            :    VAEntrypointEncSlice
>>        VAProfileMPEG2Main              :    VAEntrypointVLD
>>        VAProfileMPEG2Main              :    VAEntrypointEncSlice
>>        VAProfileH264ConstrainedBaseline:    VAEntrypointVLD
>>        VAProfileH264ConstrainedBaseline:    VAEntrypointEncSlice
>>        VAProfileH264Main               :    VAEntrypointVLD
>>        VAProfileH264Main               :    VAEntrypointEncSlice
>>        VAProfileH264High               :    VAEntrypointVLD
>>        VAProfileH264High               :    VAEntrypointEncSlice
>>        VAProfileVC1Simple              :    VAEntrypointVLD
>>        VAProfileVC1Main                :    VAEntrypointVLD
>>        VAProfileVC1Advanced            :    VAEntrypointVLD
>>        VAProfileNone                   :    VAEntrypointVideoProc
>>        VAProfileJPEGBaseline           :    VAEntrypointVLD
>>
>> The difference is in the ioctl to /dev/dri/card0. As non-root user I get:
>>
>> ioctl(3, 0xc0406400, 0x14786c0)         = 0
>> ioctl(3, 0xc0406400, 0x14786c0)         = 0
>> ioctl(3, 0x80046402, 0x7fffe00d6300)    = 0
>> ioctl(3, 0xc0286405, 0x7fffe00d6260)    = 0
>> ioctl(3, 0xc0286405, 0x7fffe00d6260)    = -1 EINVAL (Invalid argument)
>> futex(0x7f549de7a0ec, FUTEX_WAKE_PRIVATE, 2147483647) = 0
>> ioctl(3, 0x40046411, 0x7fffe00d62e0)    = -1 EACCES (Permission denied)
>> write(2, "libva info: va_getDriverName() r"..., 41libva info:
>> va_getDriverName() returns 1
>> ) = 41
>> write(2, "libva error: va_getDriverName() "..., 78libva error:
>> va_getDriverName() failed with operation failed,driver_name=i965
>> ) = 78
>>
>> but as root I get:
>>
>> ioctl(3, 0xc0406400, 0x10656c0)         = 0
>> ioctl(3, 0xc0406400, 0x10656c0)         = 0
>> ioctl(3, 0x80046402, 0x7fff4a5b24b0)    = 0
>> ioctl(3, 0xc0286405, 0x7fff4a5b2410)    = 0
>> write(2, "libva info: va_getDriverName() r"..., 41libva info:
>> va_getDriverName() returns 0
>> ) = 41
>> geteuid()                               = 0
>> getuid()                                = 0
>> write(2, "libva info: Trying to open /usr/"..., 75libva info: Trying to
>> open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
>> ) = 75
>>
>> Regards,
>>
>> Thomas
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> Regards,

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