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mediafoundation: Add a min slice buffer size stopgap

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Reviewed-by: Pohsiang (John) Hsu <pohhsu@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38195>
This commit is contained in:
Silvio Vilerino 2025-10-29 19:52:31 -04:00 • committed by Pohsiang (John) Hsu
parent 027b523398
commit 7fb5c10f65
1 changed files with 7 additions and 1 deletions
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8
src/gallium/frontends/mediafoundation/encode.cpp
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@ -592,6 +592,12 @@ CDX12EncHMFT::PrepareForEncode( IMFSample *pSample, LPDX12EncodeContext *ppDX12E
num_output_buffers = m_EncoderCapabilities.m_uiMaxHWSupportedMaxSlices;
}
// Minimum per-slice buffer size to prevent excessively small allocations.
// This is especially important in PIPE_SLICE_MODE_AUTO where num_output_buffers
// can be set to the maximum possible slices, leading to very small per-slice
// buffer sizes that may be insufficient for actual bitstream data.
const uint32_t min_slice_buffer_size = 256 * 1024; // 256KB
pDX12EncodeContext->sliceNotificationMode = D3D12_VIDEO_ENCODER_COMPRESSED_BITSTREAM_NOTIFICATION_MODE_FULL_FRAME;
if( m_bSliceGenerationModeSet && ( m_uiSliceGenerationMode > 0 ) &&
( num_output_buffers > 1 ) /* IHV driver requires > 1 slices */ )
@ -604,7 +610,7 @@ CDX12EncHMFT::PrepareForEncode( IMFSample *pSample, LPDX12EncodeContext *ppDX12E
// Be careful with the allocation size of slice buffers, when the number of slices is high
// and we run in LowLatency = 0, we can start thrashing when trying to MakeResident lots
// of big allocations in short amounts of time (num slices x num in flight frames)
templ.width0 = ( m_uiMaxOutputBitstreamSize / num_output_buffers );
templ.width0 = std::max( ( m_uiMaxOutputBitstreamSize / num_output_buffers ), min_slice_buffer_size );
}
else
{