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gst/h264parse/gsth264parse.c: Parse NAL units in forward mode to mark delta units flags.

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Original commit message from CVS:
2008-01-22  Julien Moutte  <julien@fluendo.com>

* gst/h264parse/gsth264parse.c: (gst_h264_parse_chain_forward):
Parse NAL units in forward mode to mark delta units flags.
This commit is contained in:
Julien Moutte 2008-01-22 17:43:35 +00:00
parent 274a5b1f9c
commit 9b1dd1311d
2 changed files with 63 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-01-22 Julien Moutte <julien@fluendo.com>
* gst/h264parse/gsth264parse.c: (gst_h264_parse_chain_forward):
Parse NAL units in forward mode to mark delta units flags.
2008-01-22 Stefan Kost <ensonic@users.sf.net>
* docs/plugins/gst-plugins-bad-plugins-docs.sgml:

58
gst/h264parse/gsth264parse.c
View file

@ -395,6 +395,7 @@ gst_h264_parse_chain_forward (GstH264Parse * h264parse, gboolean discont,
gint next_nalu_pos = -1;
guint32 nalu_size;
gint avail;
gboolean delta_unit = TRUE;
avail = gst_adapter_available (h264parse->adapter);
if (avail < 5)
@ -424,6 +425,59 @@ gst_h264_parse_chain_forward (GstH264Parse * h264parse, gboolean discont,
next_nalu_pos = avail;
}
}
/* Figure out if this is a delta unit */
{
gint nal_type = (data[4] & 0x1f);
gint nal_ref_idc = (data[4] & 0x60) >> 5;
GST_DEBUG_OBJECT (h264parse, "NAL type: %d, ref_idc: %d", nal_type,
nal_ref_idc);
/* first parse some things needed to get to the frame type */
if (nal_type >= NAL_SLICE && nal_type <= NAL_SLICE_IDR) {
GstNalBs bs;
gint first_mb_in_slice, slice_type;
guint8 *bs_data = (guint8 *) data + 5;
gst_nal_bs_init (&bs, bs_data, avail - 5);
first_mb_in_slice = gst_nal_bs_read_ue (&bs);
slice_type = gst_nal_bs_read_ue (&bs);
GST_DEBUG_OBJECT (h264parse, "first MB: %d, slice type: %d",
first_mb_in_slice, slice_type);
switch (slice_type) {
case 0:
case 5:
case 3:
case 8: /* SP */
/* P frames */
GST_DEBUG_OBJECT (h264parse, "we have a P slice");
delta_unit = TRUE;
break;
case 1:
case 6:
/* B frames */
GST_DEBUG_OBJECT (h264parse, "we have a B slice");
delta_unit = TRUE;
break;
case 2:
case 7:
case 4:
case 9:
/* I frames */
GST_DEBUG_OBJECT (h264parse, "we have an I slice");
delta_unit = FALSE;
break;
}
} else if (nal_type >= NAL_SPS && nal_type <= NAL_PPS) {
/* This can be considered as a non delta unit */
GST_DEBUG_OBJECT (h264parse, "we have a SPS or PPS NAL");
delta_unit = FALSE;
}
}
/* we have a packet */
if (next_nalu_pos > 0) {
GstBuffer *outbuf;
@ -439,6 +493,10 @@ gst_h264_parse_chain_forward (GstH264Parse * h264parse, gboolean discont,
h264parse->discont = FALSE;
}
if (delta_unit) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (h264parse->srcpad));
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
res = gst_pad_push (h264parse->srcpad, outbuf);