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codecparsers: h264: fix slice_header() parsing.

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We were not parsing the slice headers until the actual end, we are now
parsing until the end.
This commit is contained in:
Gwenole Beauchesne 2011-08-16 15:14:03 +02:00 committed by Edward Hervey
parent 43e47009d5
commit 0a0c73169f
2 changed files with 34 additions and 0 deletions
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24
gst-libs/gst/codecparsers/gsth264parser.c
View file

@ -109,6 +109,30 @@ const guint8 zigzag_4x4[16] = {
7, 11, 14, 15, 7, 11, 14, 15,
}; };
/* Compute Ceil(Log2(v)) */
/* Derived from branchless code for integer log2(v) from:
<http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog> */
static guint
ceil_log2 (guint32 v)
{
guint r, shift;
v--;
r = (v > 0xFFFF) << 4;
v >>= r;
shift = (v > 0xFF) << 3;
v >>= shift;
r |= shift;
shift = (v > 0xF) << 2;
v >>= shift;
r |= shift;
shift = (v > 0x3) << 1;
v >>= shift;
r |= shift;
r |= (v >> 1);
return r + 1;
}
/****** Nal parser ******/ /****** Nal parser ******/
typedef struct typedef struct

10
gst-libs/gst/codecparsers/gsth264parser.h
View file

@ -546,6 +546,16 @@ struct _GstH264SliceHdr
/* if nal_unit.ref_idc != 0 */ /* if nal_unit.ref_idc != 0 */
GstH264DecRefPicMarking dec_ref_pic_marking; GstH264DecRefPicMarking dec_ref_pic_marking;
guint8 cabac_init_idc;
gint8 slice_qp_delta;
gint8 slice_qs_delta;
guint8 disable_deblocking_filter_idc;
gint8 slice_alpha_c0_offset_div2;
gint8 slice_beta_offset_div2;
guint16 slice_group_change_cycle;
/* calculated values */ /* calculated values */
guint32 max_pic_num; guint32 max_pic_num;
gboolean valid; gboolean valid;