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h265parser: Various update of vps parsing

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* Add FIXME for future correction of HRDParames parsing.
Spec. defines that the number of HRDParames could be up to
"vps_num_layer_sets_minus1 + 1" (i.e., 1024).

* Add parsing vps_base_layer_{internal,available}_flag.

* Fix possible invalid vps_extension parsing.

Fixes #798
This commit is contained in:
Seungha Yang 2018-10-14 16:36:33 +09:00
parent 4e5894fa3d
commit 52f2054386
2 changed files with 40 additions and 6 deletions
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38
gst-libs/gst/codecparsers/gsth265parser.c
View file

@ -1400,9 +1400,8 @@ gst_h265_parse_vps (GstH265NalUnit * nalu, GstH265VPS * vps)
READ_UINT8 (&nr, vps->id, 4);
/* skip reserved_three_2bits */
if (!nal_reader_skip (&nr, 2))
goto error;
READ_UINT8 (&nr, vps->base_layer_internal_flag, 1);
READ_UINT8 (&nr, vps->base_layer_available_flag, 1);
READ_UINT8 (&nr, vps->max_layers_minus1, 6);
READ_UINT8 (&nr, vps->max_sub_layers_minus1, 3);
@ -1446,9 +1445,13 @@ gst_h265_parse_vps (GstH265NalUnit * nalu, GstH265VPS * vps)
/* allowd range is 0 to 1023 */
CHECK_ALLOWED_MAX (vps->num_layer_sets_minus1, 1023);
for (i = 1; i <= vps->num_layer_sets_minus1; i++)
for (j = 0; j <= vps->max_layer_id; j++)
for (i = 1; i <= vps->num_layer_sets_minus1; i++) {
for (j = 0; j <= vps->max_layer_id; j++) {
/* layer_id_included_flag[i][j] */
/* FIXME: need to parse this when we can support parsing multi-layer info. */
nal_reader_skip (&nr, 1);
}
}
READ_UINT8 (&nr, vps->timing_info_present_flag, 1);
@ -1476,6 +1479,31 @@ gst_h265_parse_vps (GstH265NalUnit * nalu, GstH265VPS * vps)
vps->cprms_present_flag, vps->max_sub_layers_minus1))
goto error;
}
/* FIXME: VPS can have multiple hrd parameters, and therefore hrd_params
* should be an array (like Garray). But it also requires new _clear()
* method for free the array in GstH265VPS whenever gst_h265_parse_vps()
* is called. Need to work for multi-layer related parsing supporting
*
* FIXME: Following code is just work around to find correct
* vps_extension position */
/* skip the first parsed one above */
for (i = 1; i < vps->num_hrd_parameters; i++) {
guint16 hrd_layer_set_idx;
guint8 cprms_present_flag;
GstH265HRDParams hrd_params;
READ_UE_MAX (&nr, hrd_layer_set_idx, 1023);
CHECK_ALLOWED_MAX (hrd_layer_set_idx, vps->num_layer_sets_minus1);
/* need parsing if (i > 1) */
READ_UINT8 (&nr, cprms_present_flag, 1);
if (!gst_h265_parse_hrd_parameters (&hrd_params, &nr,
cprms_present_flag, vps->max_sub_layers_minus1))
goto error;
}
}
READ_UINT8 (&nr, vps->vps_extension, 1);
vps->valid = TRUE;

8
gst-libs/gst/codecparsers/gsth265parser.h
View file

@ -517,6 +517,8 @@ struct _GstH265HRDParams
/**
* GstH265VPS:
* @id: vps id
* @base_layer_internal_flag and @base_layer_available_flag:
* specify availability of base layer
* @max_layers_minus1: should be zero, but can be other values in future
* @max_sub_layers_minus1:specifies the maximum number of temporal sub-layers
* @temporal_id_nesting_flag: specifies whether inter prediction is
@ -555,6 +557,9 @@ struct _GstH265HRDParams
struct _GstH265VPS {
guint8 id;
guint8 base_layer_internal_flag;
guint8 base_layer_available_flag;
guint8 max_layers_minus1;
guint8 max_sub_layers_minus1;
guint8 temporal_id_nesting_flag;
@ -576,9 +581,10 @@ struct _GstH265VPS {
guint32 num_ticks_poc_diff_one_minus1;
guint16 num_hrd_parameters;
/* FIXME: following HRD related info should be an array */
guint16 hrd_layer_set_idx;
guint8 cprms_present_flag;
GstH265HRDParams hrd_params;
guint8 vps_extension;