The spec states that the last byte of a NAL 'shall not' be 0x00
and it is allowed for byte-stream format to add padding 0x00 for
alignment.
So our parser should strip any trailling 0x00.
https://bugzilla.gnome.org/show_bug.cgi?id=721384
The parser assumes that every time there is a 0 before the startcode,
it is part of the startcode. But that's not true.
From the specification
Byte stream NAL unit syntax
zero_byte is a single byte equal to 0x00.
When any of the following conditions are fulfilled, the zero_byte syntax
element shall be present.
– the nal_unit_type within the nal_unit( ) is equal to 7 (sequence parameter
set) or 8 (picture parameter set)
– the byte stream NAL unit syntax structure contains the first NAL unit of an
access unit in decoding order, as specified by subclause 7.4.1.2.3.
The problem with doing this for all startcodes is that a trailing zero can mess
up timestamps. The trailing zero gets prepended to the startcode, which will
carry the PTS and DTS of previous buffer.
https://bugzilla.gnome.org/show_bug.cgi?id=664443
Fix picture level scaling lists derivation from fall-back rule set B,
as specified in 7.4.2.2. More precisely, the sequence level scaling
lists need to be used but intra and inter lists arguments were swapped.
This fixes FRExt/freh5.264 from conformance testing.
https://bugzilla.gnome.org/show_bug.cgi?id=720099
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
We only check input from the API user with g_return_*_if_fail().
Internal sanity checks should use g_assert() instead, which is
disabled by default for releases.
Fix calculation of the frame cropping rectangle, and more precisely
the actual cropped height. The frame_crop_top_offset subtraction
was not scaled up with SubHeightC.
Also clean-up variables to align more with (7-18) to (7-21).
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Assign the un-cropped width/height to sps->width/sps->height
during sps header parsing. Added new fields to SPS header structure
to provide the crop-rectangle dimensions.
https://bugzilla.gnome.org/show_bug.cgi?id=694068
Add API to parse the Slice header. This also calculates the macroblock
position as specified in 6.3.16.
https://bugzilla.gnome.org/show_bug.cgi?id=664274
Signed-off-by: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Add new interface to MPEG-2 video parser that takes GstMpegVideoPacket
arguments instead of data, size, and offset. New functions are called
after gst_mpeg_video_packet_*() and provide the default implementation.
Older API is moved to the deprecated namespace and uses the new functions.
https://bugzilla.gnome.org/show_bug.cgi?id=692933
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Ignore the display_extension values if they are greater than the width/height
values provided by seqhdr and calculate the PAR based on the seqhdr values.T
his is what DVD players are doing.
Thanks to "David Schleef <ds@schleef.org>"
https://bugzilla.gnome.org/show_bug.cgi?id=685103
This can be used by parsers to provide pre-parsed information to
downstream elements that would require it (so they can avoid having
to parse the bitstream again).
Add utility functions to convert quantization matrices from zigzag scan
order (as encoded in the bitstream) into raster scan order. Also provide
another function to reverse the operation.
https://bugzilla.gnome.org/show_bug.cgi?id=693000
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Quantizer matrices are encoded in zigzag scan order in the bitstream,
but they are stored in raster scan order when they are parsed. However,
default matrices were also prepared in zigzag scan order, hence the
mismatch. i.e. the matrices were presented either in raster scan order
if they are explicitly present in the bitstream, or they were presented
in zigzag scan order if the default definitions were to be used instead.
One way to solve this problem is to always expose the quantization
matrices in zigzag scan order, since this is the role of the parser to
not build up stories from the source bitstream and just present what
is in there.
Utility functions will be provided to convert quantization matrices in
either scan order.
https://bugzilla.gnome.org/show_bug.cgi?id=693000
Signed-off-by: Cong Zhong <congx.zhong@intel.com>
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix parsing of residual bytes. This is a two-step process. First,
remaining colums of full vertical resolution (<height>) need to be
processed. Next, remaining bytes in the first row can be processed,
while taking into account the fact that we may have filled in the
first columns already. So, this is not full horizontal resolution.
The following figure helps in understanding the expected order of
operations, for a 8x5 MBs bitplane.
5 5 6 6 6 6 6 6
5 5 1 1 1 2 2 2
5 5 1 1 1 2 2 2
5 5 3 3 3 4 4 4
5 5 3 3 3 4 4 4
So, after tiles 1 to 4 are decoded, vertical tile 5 needs to be
processed (2x5 MBs) and then the horizontal tile 6 (6x1 MBs).
https://bugzilla.gnome.org/show_bug.cgi?id=692461
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix decoding of DIFF6 or NORM6 bitplanes with an odd number of lines
(3x2 "horizontal" tiles). In this case, we have to skip the first line
of macroblocks but <width> number of bytes was used to do so, instead
of the actual <stride> size.
This fixes decoding for the video sample attached to:
https://bugzilla.gnome.org/show_bug.cgi?id=668565https://bugzilla.gnome.org/show_bug.cgi?id=692461
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Add gst_vc1_parse_slice_header() function to parse slice headers as
described in 7.1.2. Slice layers are optional and allowed in advanced
profile mode only. Picture header, if available (PIC_HEADER_FLAG),
is parsed but not recorded because it shall be the same as that was
previously parsed with gst_vc1_parse_frame_header().
This fixes SA00049.vc1 conformance test.
https://bugzilla.gnome.org/show_bug.cgi?id=692388
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix decoding of DIFF2 or NORM2 bitplanes with an odd number of macroblocks.
In particular, account for the first bit that was already parsed so that to
avoid a buffer overflow after all pairs are parsed.
This fixes SA00040.vc1 conformance test.
https://bugzilla.gnome.org/show_bug.cgi?id=692312
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Rename dqsbedge to dqbedge. The intent is that we can only have a single
boundary edge selector, depending on the value of dqprofile. So, dqbedge
represents DQSBEDGE if dqprofile == GST_VC1_DQPROFILE_SINGLE_EDGE, or
DQDBEDGE if dqprofile == GST_VC1_DQPROFILE_DOUBLE_EDGE.
The former dqbedge field is marked as unused and can be removed on the
next gst-plugins-bad version that allows ABI changes.
https://bugzilla.gnome.org/show_bug.cgi?id=692272
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix parsing of VOPDQUANT when DQUANT == 2. In particular, DQUANTFRM is
not present in the bitstream in this case and it shall be derived to
the default value of zero (7.1.1.31.1).
https://bugzilla.gnome.org/show_bug.cgi?id=692271
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix calculation of ALTPQUANT when DQUANT == 1. PQDIFF alters ALTPQUANT
in any case. See 7.1.1.31.6.
https://bugzilla.gnome.org/show_bug.cgi?id=692270
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix parse_vopdquant() to correctly parse DQPROFILE, which is 2 bits
instead of a single bit.
https://bugzilla.gnome.org/show_bug.cgi?id=692267
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
The standard specifies that when slice_beta_offset_div2 is not present
in the slice header, then the value of slice_beta_offset_div2 shall be
inferred to be equal to 0.
https://bugzilla.gnome.org/show_bug.cgi?id=692265
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
