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va: Avoid the array index overflow when filling 8x8 scaling list.

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The VA API has not defined the scaling list entries for U/V planes
for the 4:4:4 stream. In fact, we do not meet the 4:4:4 format output
for H264 so far, and scaling list is not used frequently, so we just
print out some warning and ignore these scaling list values.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3879>
This commit is contained in:
He Junyan 2023-01-19 11:03:09 +08:00 committed by Tim-Philipp Müller
parent 864f895e1b
commit 23c45c269f
1 changed files with 10 additions and 4 deletions
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14
subprojects/gst-plugins-bad/sys/va/gstvah264dec.c
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@ -381,7 +381,7 @@ gst_va_h264_dec_start_picture (GstH264Decoder * decoder,
GstVaDecodePicture *va_pic;
VAIQMatrixBufferH264 iq_matrix = { 0, };
VAPictureParameterBufferH264 pic_param;
guint i, n;
guint i;
GArray *ref_list = self->ref_list;
va_pic = gst_h264_picture_get_user_data (picture);
@ -472,9 +472,15 @@ gst_va_h264_dec_start_picture (GstH264Decoder * decoder,
/* We need the first 2 entries (Y intra and Y inter for YCbCr 4:2:2 and
* less, and the full 6 entries for 4:4:4, see Table 7-2 of the spec for
* more details */
n = (pps->sequence->chroma_format_idc == 3) ? 6 : 2;
for (i = 0; i < n; i++) {
* more details.
* But VA API only define the first 2 entries, so we may lose scaling
* list info for 4:4:4 stream. */
if (pps->sequence->chroma_format_idc == 3)
GST_WARNING_OBJECT (self, "We do not have scaling list entries "
"for U/V planes in 4:4:4 stream. It may have artifact if "
"those scaling lists are not default value.");
for (i = 0; i < 2; i++) {
gst_h264_quant_matrix_8x8_get_raster_from_zigzag (iq_matrix.ScalingList8x8
[i], pps->scaling_lists_8x8[i]);
}