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decoder: hevc: Add calculation of WpOffsetHalfRangeC

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This is necessary for finding ChromaOffsetL0/ChromaOffsetL1
prediction weight table values with out using any hard coding.

Fixme: We don't have parser API for sps_range_extension, so
assumed zero value for high_precision_offsets_enabled_flag.

Signed-off-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
This commit is contained in:
Sreerenj Balachandran 2015-08-13 05:07:52 +03:00
parent 1f287dc71c
commit 53a0e78948
1 changed files with 20 additions and 6 deletions
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26
gst-libs/gst/vaapi/gstvaapidecoder_h265.c
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@ -388,6 +388,7 @@ struct _GstVaapiDecoderH265Private
guint RefPicList1_count;
guint32 SpsMaxLatencyPictures;
gint32 WpOffsetHalfRangeC;
guint nal_length_size;
@ -1487,6 +1488,7 @@ decode_sps (GstVaapiDecoderH265 * decoder, GstVaapiDecoderUnit * unit)
GstVaapiDecoderH265Private *const priv = &decoder->priv;
GstVaapiParserInfoH265 *const pi = unit->parsed_info;
GstH265SPS *const sps = &pi->data.sps;
guint high_precision_offsets_enabled_flag = 0, bitdepthC = 0;
GST_DEBUG ("decode SPS");
@ -1495,6 +1497,13 @@ decode_sps (GstVaapiDecoderH265 * decoder, GstVaapiDecoderUnit * unit)
sps->max_num_reorder_pics[sps->max_sub_layers_minus1] +
sps->max_latency_increase_plus1[sps->max_sub_layers_minus1] - 1;
/* Calculate WpOffsetHalfRangeC: (7-34)
* Fixme: We don't have parser API for sps_range_extension, so assuming
* high_precision_offsets_enabled_flag as zero */
bitdepthC = sps->bit_depth_chroma_minus8 + 8;
priv->WpOffsetHalfRangeC =
1 << (high_precision_offsets_enabled_flag ? (bitdepthC - 1) : 7);
gst_vaapi_parser_info_h265_replace (&priv->sps[sps->id], pi);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
@ -2325,6 +2334,7 @@ static gboolean
fill_pred_weight_table (GstVaapiDecoderH265 * decoder,
GstVaapiSlice * slice, GstH265SliceHdr * slice_hdr)
{
GstVaapiDecoderH265Private *const priv = &decoder->priv;
VASliceParameterBufferHEVC *const slice_param = slice->param;
GstH265PPS *const pps = get_pps (decoder);
GstH265SPS *const sps = get_sps (decoder);
@ -2379,9 +2389,10 @@ fill_pred_weight_table (GstVaapiDecoderH265 * decoder,
(1 << chroma_log2_weight_denom) + w->delta_chroma_weight_l0[i][j];
/* 7-56 */
slice_param->ChromaOffsetL0[i][j] = CLAMP (
(127 + w->delta_chroma_offset_l0[i][j] -
((128 * chroma_weight) >> chroma_log2_weight_denom)), -128,
127);
(priv->WpOffsetHalfRangeC + w->delta_chroma_offset_l0[i][j] -
((priv->WpOffsetHalfRangeC *
chroma_weight) >> chroma_log2_weight_denom)),
-priv->WpOffsetHalfRangeC, priv->WpOffsetHalfRangeC - 1);
}
}
}
@ -2400,10 +2411,13 @@ fill_pred_weight_table (GstVaapiDecoderH265 * decoder,
chroma_weight =
(1 << chroma_log2_weight_denom) +
w->delta_chroma_weight_l1[i][j];
/* 7-56 */
slice_param->ChromaOffsetL1[i][j] =
CLAMP ((127 + w->delta_chroma_offset_l1[i][j] -
((128 * chroma_weight) >> chroma_log2_weight_denom)), -128,
127);
CLAMP ((priv->WpOffsetHalfRangeC +
w->delta_chroma_offset_l1[i][j] -
((priv->WpOffsetHalfRangeC *
chroma_weight) >> chroma_log2_weight_denom)),
-priv->WpOffsetHalfRangeC, priv->WpOffsetHalfRangeC - 1);
}
}
}