media: H264 CENCv1 support for VAAPI
This adds handling of CENCv1 (full sample encryption) streams for H264 with the VAAPI accelerator. The decoder detects when this case occurs and then offloads slice header parsing to the accelerator. BUG=b:153111783,b:155508443 TEST=Unit tests pass, CENCv1 playback works Change-Id: Ieb913935269163d09d24b88a8ea987a6e8ffce33 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552634 Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com> Reviewed-by:Miguel Casas <mcasas@chromium.org> Reviewed-by:
Xiaohan Wang <xhwang@chromium.org> Cr-Commit-Position: refs/heads/master@{#833458}
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