[Mesa-dev] nouveau: xvmc on nv43

Fri Aug 16 07:34:43 PDT 2013

On Fri, Aug 16, 2013 at 5:40 AM, Pali Rohár <pali.rohar at gmail.com> wrote:
> Hello Ilia,
>
> I was your last commit which fixing xvmc support for nv30 hw in mesa git tree.
> Maybe you can help me. I have graphics card nvidia geforce 6600 gt (nv43 chip)
> According to wiki page http://nouveau.freedesktop.org/wiki/FeatureMatrix/ xvmc
> support for nv43 is already done. When I start xvmcinfo it print:

FTR, an individual with a NV43 AGP had trouble with it. See
http://nouveau.freedesktop.org/wiki/VideoAcceleration/ for a few more
details. Note that if you're using a recent kernel, you need 3.11-rc4
or later (nouveau/master is fine too, of course), as support got
broken at some point.

>
> $ ./xvmcinfo

Huh, never heard of that. No gentoo ebuild either.

>
> Xv version 2.2
> XvMC version 1.1
>
> screen number 0
>    info for adaptor 0 [NV40 texture adapter]
>       number of XvMC surface types: 2
>
>       info about surface 0:
>          max_width=2048
>          max_height=2048
>          subpicture_max_width=2048
>          subpicture_max_height=2048
>          chroma_format:
>             XVMC_CHROMA_FORMAT_420
>          mc_type:
>             format                   : MPEG2
>             accelaration start from  : IDCT
>          flags:
>             XVMC_BACKEND_SUBPICTURE XVMC_SUBPICTURE_INDEPENDENT_SCALING
>
>       info about surface 1:
>          max_width=2048
>          max_height=2048
>          subpicture_max_width=2048
>          subpicture_max_height=2048
>          chroma_format:
>             XVMC_CHROMA_FORMAT_422
>          mc_type:
>             format                   : MPEG2
>             accelaration start from  : IDCT
>          flags:
>             XVMC_BACKEND_SUBPICTURE XVMC_SUBPICTURE_INDEPENDENT_SCALING
>
>    info for adaptor 1 [NV40 high quality adapter]
>       number of XvMC surface types: 0
>
>    info for adaptor 2 [NV Video Blitter]
>       number of XvMC surface types: 0

This actually doesn't (necessarily) have anything to do with reality.
It's reported entirely by X, which has little to do with actual XvMC
operation.

>
> So some xvmc support is there (via nouveau xvmc library). But when I tried to
> use mpeg2play_accel testing application (or mplayer) it crash. Here is gdb
> backtrace from coredump file:
>
> (gdb) bt
> #0  0x0000000000000000 in ?? ()
> #1  0x00007fca300cd345 in XvMCCreateContext (dpy=0xbefd00, port=63,
> surface_type_id=842094169, width=720, height=480, flags=1, context=0x60dee0)
>     at context.c:248
> #2  0x000000000040941f in init_display () at display.c:270
> #3  0x0000000000402f0c in initdecoder () at mpeg2dec.c:211
> #4  0x0000000000402b57 in main (argc=2, argv=0x7fff94c89f10) at mpeg2dec.c:121
> (gdb) bt full
> #0  0x0000000000000000 in ?? ()
> No symbol table info available.
> #1  0x00007fca300cd345 in XvMCCreateContext (dpy=0xbefd00, port=63,
> surface_type_id=842094169, width=720, height=480, flags=1, context=0x60dee0)
>     at context.c:248
>         found_port = true
>         scrn = 0
>         chroma_format = 1
>         mc_type = 65538
>         surface_flags = 6
>         subpic_max_w = 2048
>         subpic_max_h = 2048
>         ret = 0
>         vscreen = 0xbf13f0
>         pipe = 0xc191e0
>         context_priv = 0xbfead0
>         csc = {{0, 0, 0, 0}, {-2.02570359e-26, 4.59163468e-41, 5.89217978e-39,
> 0}, {-2.02575536e-26, 4.59163468e-41, 8.44951942e-10, 4.5842078e-41}}
> #2  0x000000000040941f in init_display () at display.c:270
>         surface_type_id = 842094169
>         result = 0
>         i = 4204800
>         color = 0
>         root = 652
> #3  0x0000000000402f0c in initdecoder () at mpeg2dec.c:211
>         i = 640
>         blk_cnt_tab = {6, 8, 12}
> #4  0x0000000000402b57 in main (argc=2, argv=0x7fff94c89f10) at mpeg2dec.c:121
>         first = 1
>         framenum = 0
>         runtime = 0
>         tstart = {tv_sec = 140735689563912, tv_usec = 4236512}
>         tstop = {tv_sec = 0, tv_usec = 4204800}
>
> It looks like that in mesa code is calling pipe->create_video_decoder(...) but
> create_video_decoder is NULL and then it crash.
>
> (gdb) print *pipe
> $1 = {screen = 0xbffa50, priv = 0xbf13f0, draw = 0x0, destroy = 0x7fca300d00a0
> <nv30_context_destroy>, draw_vbo = 0x7fca300da250 <nv30_draw_vbo>,
>   render_condition = 0x7fca300dd760 <nv40_query_render_condition>,
> create_query = 0x7fca300dd510 <nv30_query_create>,
>   destroy_query = 0x7fca300dd500 <nv30_query_destroy>, begin_query =
> 0x7fca300dd890 <nv30_query_begin>, end_query = 0x7fca300dd670
> <nv30_query_end>,
>   get_query_result = 0x7fca300dd410 <nv30_query_result>, create_blend_state =
> 0x7fca300d47f0 <nv30_blend_state_create>,
>   bind_blend_state = 0x7fca300d3da0 <nv30_blend_state_bind>,
> delete_blend_state = 0x7fca300d4160 <nv30_blend_state_delete>,
>   create_sampler_state = 0x7fca300d69f0 <nv30_sampler_state_create>,
> bind_fragment_sampler_states = 0x7fca300d72a0
> <nv30_fragtex_sampler_states_bind>,
>   bind_vertex_sampler_states = 0x7fca300d79a0
> <nv40_verttex_sampler_states_bind>, bind_geometry_sampler_states = 0,
> bind_compute_sampler_states = 0,
>   delete_sampler_state = 0x7fca300d69e0 <nv30_sampler_state_delete>,
> create_rasterizer_state = 0x7fca300d44a0 <nv30_rasterizer_state_create>,
>   bind_rasterizer_state = 0x7fca300d3db0 <nv30_rasterizer_state_bind>,
> delete_rasterizer_state = 0x7fca300d4150 <nv30_rasterizer_state_delete>,
>   create_depth_stencil_alpha_state = 0x7fca300d4170 <nv30_zsa_state_create>,
> bind_depth_stencil_alpha_state = 0x7fca300d3dc0 <nv30_zsa_state_bind>,
>   delete_depth_stencil_alpha_state = 0x7fca300d4140 <nv30_zsa_state_delete>,
> create_fs_state = 0x7fca300d7cb0 <nv30_fp_state_create>,
>   bind_fs_state = 0x7fca300d7c40 <nv30_fp_state_bind>, delete_fs_state =
> 0x7fca300d7c50 <nv30_fp_state_delete>,
>   create_vs_state = 0x7fca300d8240 <nv30_vp_state_create>, bind_vs_state =
> 0x7fca300d8230 <nv30_vp_state_bind>,
>   delete_vs_state = 0x7fca300d8360 <nv30_vp_state_delete>, create_gs_state =
> 0, bind_gs_state = 0, delete_gs_state = 0,
>   create_vertex_elements_state = 0x7fca300d9d90 <nv30_vertex_state_create>,
> bind_vertex_elements_state = 0x7fca300d9d40 <nv30_vertex_state_bind>,
>   delete_vertex_elements_state = 0x7fca300d9d60 <nv30_vertex_state_delete>,
> set_blend_color = 0x7fca300d3dd0 <nv30_set_blend_color>,
>   set_stencil_ref = 0x7fca300d3df0 <nv30_set_stencil_ref>, set_sample_mask =
> 0x7fca300d3e10 <nv30_set_sample_mask>,
>   set_clip_state = 0x7fca300d4080 <nv30_set_clip_state>, set_constant_buffer =
> 0x7fca300d4c30 <nv30_set_constant_buffer>,
>   set_framebuffer_state = 0x7fca300d3f50 <nv30_set_framebuffer_state>,
> set_polygon_stipple = 0x7fca300d3e30 <nv30_set_polygon_stipple>,
>   set_scissor_states = 0x7fca300d3ef0 <nv30_set_scissor_states>,
> set_viewport_states = 0x7fca300d3f10 <nv30_set_viewport_states>,
>   set_fragment_sampler_views = 0x7fca300d7330
> <nv30_fragtex_set_sampler_views>,
>   set_vertex_sampler_views = 0x7fca300d7a30 <nv40_verttex_set_sampler_views>,
> set_geometry_sampler_views = 0, set_compute_sampler_views = 0,
>   set_shader_resources = 0, set_vertex_buffers = 0x7fca300d4000
> <nv30_set_vertex_buffers>, set_index_buffer = 0x7fca300d4dc0
> <nv30_set_index_buffer>,
>   create_stream_output_target = 0, stream_output_target_destroy = 0,
> set_stream_output_targets = 0,
>   resource_copy_region = 0x7fca300d2e30 <nv30_resource_copy_region>, blit =
> 0x7fca300d3370 <nv30_blit>, clear = 0x7fca300d8be0 <nv30_clear>,
>   clear_render_target = 0x7fca300d95c0 <nv30_clear_render_target>,
> clear_depth_stencil = 0x7fca300d91b0 <nv30_clear_depth_stencil>,
>   flush = 0x7fca300d0130 <nv30_context_flush>, create_sampler_view =
> 0x7fca300d6ec0 <nv30_sampler_view_create>,
>   sampler_view_destroy = 0x7fca300d7220 <nv30_sampler_view_destroy>,
> create_surface = 0x7fca300d3be0 <nv30_miptree_surface_new>,
>   surface_destroy = 0x7fca300d3d60 <nv30_miptree_surface_del>, transfer_map =
> 0x7fca30031040 <u_transfer_map_vtbl>,
>   transfer_flush_region = 0x7fca30031050 <u_transfer_flush_region_vtbl>,
> transfer_unmap = 0x7fca30031060 <u_transfer_unmap_vtbl>,
>   transfer_inline_write = 0x7fca30031070 <u_transfer_inline_write_vtbl>,
> texture_barrier = 0, create_video_decoder = 0, create_video_buffer = 0,
>   create_compute_state = 0, bind_compute_state = 0, delete_compute_state = 0,
> set_compute_resources = 0, set_global_binding = 0, launch_grid = 0,
>   get_sample_position = 0}

That's rather odd... there isn't really a code path that doesn't
initialize create_video_decoder at this point, take a look at
nv30_context.c -- it calls nouveau_context_init_vdec unconditionally,
which in turn just sets a couple of pointers. Are you sure that you're
running with the latest version? Note that the XvMC library used is
selected by /etc/X11/XvMCConfig. (I think libXvMCW reads that file and
dlopens it.) It might be nice to see in strace -f -e open that it
actually opens the libXvMCnouveau.so file that you built.

  -ilia