The recovery point SEI message helps a decoder in determining if the
decoding process would produce acceptable pictures for display after
the decoder initiates random access or after the encoder indicates
a broken link in the coded video sequence.
This is not used in the h264parse element, but it could help debugging.
https://bugzilla.gnome.org/show_bug.cgi?id=723380
Add nal_reader_skip_long() helper function to allow an arbitrary number
of bits to be skipped. The former nal_reader_skip() function is too
limited to the actual cache size.
Use this new function to simplify gst_h264_parser_parse_sei_message()
default case, that skips unsupported payloads.
v2: made args consistent from header to source file.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix routine names for zigzag/raster scan order conversion routines for
quantization matrices. This ought to use the gst_h264_quant_matrix_*()
naming convention instead of gst_h264_video_quant_matrix_*(), which
derived from the MPEG-2 function names.
https://bugzilla.gnome.org/show_bug.cgi?id=731524
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Add a new function to calculate video stream framerate which rely on
SPS, slice header and pic timing using formula:
time_scale 1 1
fps = ----------------- x --------------- x ------------------------
num_units_in_tick DeltaTfiDivisor (field_pic_flag ? 2 : 1)
See section E2.1 of H264 specification for definition of variables.
https://bugzilla.gnome.org/show_bug.cgi?id=723352
When parsing slice groups information for slice_group_map_type = 2, we
should only be reading up to num_slice_groups_minus1 groups since there
is always a "leftover" slice group and as many "foreground" slice groups
as needed.
This fixes parsing for SVCBMT-5 and SVCBMT-12 whereby the base layer would
have incorrectly been parsed to have up to 38 reference frames in list0,
which is not possible.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
When useDefaultScalingMatrixFlag is computed to be 1 while parsing
scaling_list(), then the scaling list shall be inferred to be equal
to the default list (7.4.2.1.1.1). That default list is really one
of Default_4x4_{Intra,Inter} or Default_8x8_{Intra,Inter} and not
one from fall-back rule sets A or B.
This fixes parsing for FRExt1_Panasonic_D, FRExt2_Panasonic_C,
FRExt3_Panasonic_E and FRExt4_Panasonic_B.
https://bugzilla.gnome.org/show_bug.cgi?id=724518
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
The idr_pic_id syntax element depends on IdrPicFlag, which is a calculated
value that does not only depend on NAL unit type (IDR), but possibly also
on MVC non_idr_flag syntax element.
The computed idr_pic_flag is already stored in GstH264NalUnit structure.
https://bugzilla.gnome.org/show_bug.cgi?id=721772
Signed-off-by: Li Xiaowei <xiaowei.a.li@intel.com>
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Split seq_parameter_set_data() parsing off gst_h264_parse_sps() so
that it could be re-used later on.
https://bugzilla.gnome.org/show_bug.cgi?id=685215
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix build when GST_DISABLE_GST_DEBUG is not defined. Use a switch
statement to dispatch to the various SEI payload handlers.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
The payloadSize does not account for emulation prevention bytes. So,
just use nal_reader_skip() for skipping payload_size bits. It should
be possible to further optimize this code since the NAL reader shall
be aligned to byte boundary already.
Kill the now unused nal_reader_skip_to_next_byte() function.
https://bugzilla.gnome.org/show_bug.cgi?id=726829
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Fix parsing of buffering_period() SEI messages. The number of bits
used to express {nal,vcl}_initial_cpb_removal_delay{,_offset} syntax
elements is not 5 but 1 + initial_cpb_removal_delay_length_minus1.
https://bugzilla.gnome.org/show_bug.cgi?id=726828
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
An SEI RBSP could contains more than one SEI message as specified in
7.4.2.3.1.
This commit change the parser API: the gst_h264_parser_parse_sei()
function now create and fill a GArray containing GstH264SEIMessage.
https://bugzilla.gnome.org/show_bug.cgi?id=721715
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>
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
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>
gst_h264_parse_sps() returned FALSE if it parsed invalid (negative)
size components. Now make it gracefully return GST_H264_PARSER_ERROR
instead of GST_H264_PARSER_OK (FALSE).
https://bugzilla.gnome.org/show_bug.cgi?id=684568
Anonymous union is an ISO C (2011) feature that is not exposed in
compilers strictly conforming to the previous standard.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
This always happens with GstByteReader/Writer and friends when
not taking into account returned boolean of the _read/_write functions
(which is actually wrong).
Make use of the *_unchecked variant as much as possible, or take the
returned value into account.
Some hardware video decode acceleration API (VA-API, DXVA) require
a bit count to the first macroblock, minus the number of emulation
prevention bytes. So, instead of having the consumer of the library
scan the slice_header() again, just record that number while parsing.
Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
https://bugzilla.gnome.org/show_bug.cgi?id=671203
The entries were not filled in linearly and the termination was not
recorded either. Now, the actual number of modifications is recorded
similarly to dec_ref_pic_marking(). i.e. an explicit counter instead
of storing the termination value in the array.
https://bugzilla.gnome.org/show_bug.cgi?id=668192
This is useful for cases where the caller *knows* that the provided
input contains a whole NALU and can therefore avoid:
* the expensive checks for the next start code (which won't be present)
* delaying the input parsing (since we would need the next incoming NALU
in order for the parsing code to detect the next start code)
https://bugzilla.gnome.org/show_bug.cgi?id=665584
