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vaapi_h264: Fix bit offset of slice data.

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Commit ca2f19b9cc modified the meaning of
H264SliceContext.gb: it is now initialised at the start of the NAL unit
header, rather than at the start of the slice header.  The VAAPI slice
decoder uses the offset after parsing to determine the offset of the
slice data in the bitstream, so with the changed meaning we no longer
need to add the extra byte to account for the NAL unit header because
it is now included directly.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Mark Thompson 2016-04-02 16:48:53 +01:00 committed by Derek Buitenhuis
parent caee88d193
commit 617cd45ddc
1 changed files with 1 additions and 1 deletions
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libavcodec/vaapi_h264.c
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@ -330,7 +330,7 @@ static int vaapi_h264_decode_slice(AVCodecContext *avctx,
slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(vactx, buffer, size);
if (!slice_param)
return -1;
slice_param->slice_data_bit_offset = get_bits_count(&sl->gb) + 8; /* bit buffer started beyond nal_unit_type */
slice_param->slice_data_bit_offset = get_bits_count(&sl->gb);
slice_param->first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
slice_param->slice_type = ff_h264_get_slice_type(sl);
slice_param->direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0;