Hi,
I am testing libva with ffmpeg on Linux to decode h264 video.
Linux version is 3.4.29
FFmpeg version is 2.5.3
Mesa version is 10.4.0
libdrm version is 2.4.58
libva version is 1.5.0
From what I could gather from the documentation and examples, using
vaDeriveImage should be preferred if it is available. However, I
have compared, with top, the CPU consumed, and I observe that the
following code:
#ifdef USE_VADERIVEIMAGE
vrc = vaDeriveImage(ctx->display, buf->surface_id, &va_image);
CHECK_VASTATUS(vrc, "vaDeriveImage");
#else
vrc = vaGetImage(ctx->display, buf->surface_id,
0, 0, cctx->coded_width, cctx->coded_height,
va_image.image_id);
CHECK_VASTATUS(vrc, "vaGetImage");
#endif
vrc = vaMapBuffer(ctx->display, va_image.buf, &data);
CHECK_VASTATUS(vrc, "vaMapBuffer");
memcpy(f->img[0], data + va_image.offsets[0],
va_image.pitches[0] * cctx->coded_height);
memcpy(f->img[1], data + va_image.offsets[1],
va_image.pitches[1] * cctx->coded_height / 2);
vrc = vaUnmapBuffer(ctx->display, va_image.buf);
CHECK_VASTATUS(vrc, "vaUnmapBuffer");
#ifdef USE_VADERIVEIMAGE
vrc = vaDestroyImage(ctx->display, va_image.image_id);
CHECK_VASTATUS(vrc, "vaDestroyImage");
#endif
Results in a higher cpu consumption if compiled with
USE_VADERIVEIMAGE. Is this normal, or is there something I am doing
wrong? I can provide the complete code if needed.
As a second question, is there a function allowing to copy image
from a VA surface to custom pointers? I see I can build a buffer
with some custom pointers, but I do not see how to copy a surface to
them. I would like something like the inverse operation of
vaRenderPicture.
Thanks in advance.
Regards.
--
Gilles.
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