lavc/qsvdec: Replace current parser with MFXVideoDECODE_DecodeHeader()

Using MSDK parser can improve qsv decoder pass rate in some cases (E.g:
sps declares a wrong level_idc, smaller than it should be).
And it is necessary for adding new qsv decoders such as MJPEG and VP9
since current parser can't provide enough information.
Actually using MFXVideoDECODE_DecodeHeader() was disscussed at
https://ffmpeg.org/pipermail/ffmpeg-devel/2015-July/175734.html and merged as commit 1acb19d,
but was overwritten when merged libav patches (commit: 1f26a23) without any explain.

Split decode header from decode_init, and call it for everyframe to
detect format/resoultion change. It can fix some regression issues such
as hevc 10bits decoding.

Signed-off-by: Zhong Li <zhong.li@intel.com>
Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavcodec/qsvdec.h b/libavcodec/qsvdec.h
index 111536caba..4812fb2a6b 100644
--- a/libavcodec/qsvdec.h
+++ b/libavcodec/qsvdec.h
@@ -63,6 +63,8 @@ typedef struct QSVContext {
     uint32_t fourcc;
     mfxFrameInfo frame_info;
 
+    int initialized;
+
     // options set by the caller
     int async_depth;
     int iopattern;