I'm using h264_amf in my project, and want to use D3D11 pixel format to encode
video in D3D11Texture2D to elinimate copy between GPU and CPU.
I found the performance is very poor, comparing to obs-project which also use
AMF as an encoder. After comparing and debugging through codes, I found these
code strange and seems does nothing useful to encoding job:
In branch 5.1.2
amfenc.c
Line 659
if (hw_surface) {
AMFBuffer *frame_ref_storage_buffer;
// input HW surfaces can be vertically aligned by 16; tell AMF the real size
surface->pVtbl->SetCrop(surface, 0, 0, frame->width,
frame->height);
frame_ref_storage_buffer = amf_create_buffer_with_frame_ref(frame,
ctx->context);
AMF_RETURN_IF_FALSE(ctx, frame_ref_storage_buffer != NULL, AVERROR(ENOMEM),
"create_buffer_with_frame_ref() returned NULL\n");
res = amf_set_property_buffer(surface, L"av_frame_ref",
frame_ref_storage_buffer);
AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_UNKNOWN, "SetProperty
failed for \"av_frame_ref\" with error %d\n", res);
ctx->hwsurfaces_in_queue++;
frame_ref_storage_buffer->pVtbl->Release(frame_ref_storage_buffer);
}
Line 707
buffer->pVtbl->Release(buffer);
if (data->pVtbl->HasProperty(data, L"av_frame_ref")) {
AMFBuffer *frame_ref_storage_buffer;
res = amf_get_property_buffer(data, L"av_frame_ref",
&frame_ref_storage_buffer);
AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_UNKNOWN, "GetProperty
failed for \"av_frame_ref\" with error %d\n", res);
amf_release_buffer_with_frame_ref(frame_ref_storage_buffer);
ctx->hwsurfaces_in_queue--;
}
data->pVtbl->Release(data);
Schwarzer
cnschwar...@qq.com
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