Hi, I have tried to get VA-API's XvBA backend working on my Zacate system and eventually succeeded. But first I was confronted with segfaults from all applications I tried (VLC, mplayer, hwdecode-demos), with the following backtrace:
__strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:32caused by __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:32 32 ../sysdeps/x86_64/multiarch/../strlen.S: No such file or directory. in ../sysdeps/x86_64/multiarch/../strlen.S (gdb) bt #0 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:32 #1 0x00007ffff6af511e in va_openDriver (dpy=0x623a30, major_version=0x7fffffffe00c, minor_version=0x7fffffffe008) at va.c:180 #2 vaInitialize (dpy=0x623a30, major_version=0x7fffffffe00c, minor_version=0x7fffffffe008) at va.c:388 #3 0x000000000040b18c in vaapi_init (display=0x623a30) at vaapi.c:137 #4 0x00000000004051b2 in main (argc=<value optimized out>, argv=<value optimized out>) at common.c:1060 This is the first bug: handing in a NULL pointer to strlen without checking. Now some digging shows that somehow fglrx does not get detected here, although present. The curious thing is that vainfo, which uses the same vaInitialize call, does not suffer from this. Turns out that vainfo is the only application that gets a specifc display on ":0.0" through XOpenDisplay, while all other applications pass whatever display they currently use to the init call. Eventually, this causes a mismatch in match_display in libva/va/x11/va_fglrx.c such that x11_dpy_name = ":0", test_dpy_name=":0.0" (and display_name being ":0" in there) which causes the comparison to fail and hence does not set the driver name to fglrx, but returns a success error code. Now, I do not know anything about the deeper reasoning behind all this, but it seems that this is inconsistent. The workaround is of course: export LIBVA_DRIVER_NAME=fglrx which is ugly. Stephan _______________________________________________ Libva mailing list Libva@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/libva
