Copy to libva maillist, it’s more about
gstreamer-codec-parser/gst-vaapi/libva/driver related issues.
Hi all,
It’s an issue about how to process the zigzagged quantization table
between gstreamer level and driver level.
Libva defined API of
typedef struct _VAIQMatrixBufferMPEG2
{
int load_intra_quantiser_matrix;
int load_non_intra_quantiser_matrix;
int load_chroma_intra_quantiser_matrix;
int load_chroma_non_intra_quantiser_matrix;
unsigned char intra_quantiser_matrix[64];
unsigned char non_intra_quantiser_matrix[64];
unsigned char chroma_intra_quantiser_matrix[64];
unsigned char chroma_non_intra_quantiser_matrix[64];
} VAIQMatrixBufferMPEG2;
Question is how to fill <xxx_intra_quantiser_matrix>, is it zigzag
ordered or scan ordered? Mpeg2 data store the quantization table in zigzag
order. Currently gstreamer-codec-parser would parse all zigzagged quantization
table from MPEG2 data and converting into scanning order. Intel-Driver would
do the same thing again. The result certainly would be incorrect.
Ffmpeg would fill the quantiser_matrix by zigzag order, do we need to
change gstreamer-codec-parse to read data into zigzag order? Does any other
package/lib already using gstreamer-codec-parser(mpeg2)? Which package should
be the right role to do the conversion from zigzag to scanning order?
Thanks,
Wind
From: Li, Jocelyn
Sent: Thursday, January 31, 2013 10:24 AM
To: Beauchesne, Gwenole; Xiang, Haihao
Cc: Zhao, Halley; Yuan, Feng; Zhong, CongX
Subject: FW: [Bug 58176] [gst-vaapi] gi4_video.bits decoding failed (MPEG2)
Hi Gwenole and Haihao,
We need your comments on the solution to fix this issue.
Thanks,
Jocelyn
From: [email protected]<mailto:[email protected]>
[mailto:[email protected]]
Sent: Wednesday, January 30, 2013 5:19 PM
To: Li, Jocelyn
Subject: [Bug 58176] [gst-vaapi] gi4_video.bits decoding failed (MPEG2)
Comment # 5<https://bugs.freedesktop.org/show_bug.cgi?id=58176#c5> on bug
58176<https://bugs.freedesktop.org/show_bug.cgi?id=58176> from Zhong
Cong<mailto:[email protected]>
Created attachment 73914<attachment.cgi?id=73914>
[details]<attachment.cgi?id=73914&action=edit>
[review]<page.cgi?id=splinter.html&bug=58176&attachment=73914>
This patch remove inverse zigzag in gstvaapi codecparser
gstvaapi codecparse handles the data with inverse zigzag, and the intel-driver
alse asks for original data to inverse zigzag. Here comes the
contradiction.This patch remove inverse zigzag in gstvaapi codecparser,and it
can solve this issue.
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