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avcodec/d3d12va_encode: don't write garbage when there is no header

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When codec->write_sequence_header is not defined, bit_len was undefined,
and while data bufer was zeroed we could just overread it. Do nothing
when we don't have anything to write.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow
2025-07-22 21:04:35 +02:00
parent a1588c875a
commit 7d9b21601c
1 changed files with 13 additions and 14 deletions
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27
libavcodec/d3d12va_encode.c
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@ -299,21 +299,20 @@ static int d3d12va_encode_issue(AVCodecContext *avctx,
"header: %d.\n", err);
goto fail;
}
pic->header_size = (int)bit_len / 8;
pic->aligned_header_size = pic->header_size % ctx->req.CompressedBitstreamBufferAccessAlignment ?
FFALIGN(pic->header_size, ctx->req.CompressedBitstreamBufferAccessAlignment) :
pic->header_size;
hr = ID3D12Resource_Map(pic->output_buffer, 0, NULL, (void **)&ptr);
if (FAILED(hr)) {
err = AVERROR_UNKNOWN;
goto fail;
}
memcpy(ptr, data, pic->aligned_header_size);
ID3D12Resource_Unmap(pic->output_buffer, 0, NULL);
}
pic->header_size = (int)bit_len / 8;
pic->aligned_header_size = pic->header_size % ctx->req.CompressedBitstreamBufferAccessAlignment ?
FFALIGN(pic->header_size, ctx->req.CompressedBitstreamBufferAccessAlignment) :
pic->header_size;
hr = ID3D12Resource_Map(pic->output_buffer, 0, NULL, (void **)&ptr);
if (FAILED(hr)) {
err = AVERROR_UNKNOWN;
goto fail;
}
memcpy(ptr, data, pic->aligned_header_size);
ID3D12Resource_Unmap(pic->output_buffer, 0, NULL);
}
d3d12_refs.NumTexture2Ds = base_pic->nb_refs[0] + base_pic->nb_refs[1];