[Libva] problem on va api of Hardware video decoding acceleration demos

[Chen, Sean]

Hi All!
I have downloaded the Hardware video decoding acceleration demo codes of VA API from freedesktop.org.
Since this codes decodes one H.264 I frame only,  I repeat decoding process of this I frame as 100000 times in
order to get its CPU usage.

Detail changes as following black codes in vaapi.c in function of vaapi_decode(), however, the cpu usage is still about 50%,
which means that hardware is not effective to decode h.264 stream. Meanwhile, I can use Mplayer with VAAPI to decode H.264 HD mp4 file ,
whose CPU usage is only 2-4%.  My hardware environment is Intel Core I7-3610QM and HD graphics 4000,  and software is Ubuntu 12.10, libva 1.0.0.15
and vaapi intel driver 1.0.17.
So I want to know How can change example codes to verify VA API hardware acceleration ?

int vaapi_decode(void)
{
    VAAPIContext * const vaapi = vaapi_get_context();
    VABufferID va_buffers[3];
    unsigned int n_va_buffers = 0, i ;
    VAStatus status;

    if (!vaapi || vaapi->context_id == 0 || vaapi->surface_id == 0)
        return -1;

    if (commit_slices(vaapi) < 0)
        return -1;

    vaUnmapBuffer(vaapi->display, vaapi->pic_param_buf_id);
    va_buffers[n_va_buffers++] = vaapi->pic_param_buf_id;

    if (vaapi->iq_matrix_buf_id) {
        vaUnmapBuffer(vaapi->display, vaapi->iq_matrix_buf_id);
        va_buffers[n_va_buffers++] = vaapi->iq_matrix_buf_id;
    }

    if (vaapi->bitplane_buf_id) {
        vaUnmapBuffer(vaapi->display, vaapi->bitplane_buf_id);
        va_buffers[n_va_buffers++] = vaapi->bitplane_buf_id;
    }

for(i = 0; i<100000;i++)
{
           status = vaBeginPicture(vaapi->display, vaapi->context_id,
                            vaapi->surface_id);
           if (!vaapi_check_status(status, "vaBeginPicture()"))
        return -1;

          status = vaRenderPicture(vaapi->display, vaapi->context_id,
                             va_buffers, n_va_buffers);
          if (!vaapi_check_status(status, "vaRenderPicture()"))
        return -1;

         status = vaRenderPicture(vaapi->display, vaapi->context_id,
                             vaapi->slice_buf_ids,
                             vaapi->n_slice_buf_ids);
         if (!vaapi_check_status(status, "vaRenderPicture()"))
        return -1;

         status = vaEndPicture(vaapi->display, vaapi->context_id);
         if (!vaapi_check_status(status, "vaEndPicture()"))
        return -1;
   }

    if (getimage_mode() == GETIMAGE_FROM_VIDEO)
        return vaapi_decode_to_image();

    return 0;
}
Regards
Sean


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