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h264parse: decode slice header

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Lin YANG 2009-08-17 17:53:43 +08:00 committed by Sebastian Dröge
parent 62ac493c5c
commit d0273eec2c
1 changed files with 37 additions and 0 deletions
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37
gst/h264parse/gsth264parse.c
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@ -720,6 +720,43 @@ gst_nal_decode_sei (GstH264Parse * h, GstNalBs * bs)
return TRUE;
}
/* decode slice header */
static gboolean
gst_nal_decode_slice_header (GstH264Parse * h, GstNalBs * bs)
{
guint8 pps_id, sps_id;
h->first_mb_in_slice = gst_nal_bs_read_ue (bs);
h->slice_type = gst_nal_bs_read_ue (bs);
pps_id = gst_nal_bs_read_ue (bs);
h->pps = gst_h264_parse_get_pps (h, pps_id);
if (!h->pps)
return FALSE;
/* FIXME: note that pps might be uninitialized */
sps_id = h->pps->sps_id;
h->sps = gst_h264_parse_get_sps (h, sps_id);
/* FIXME: in some streams sps/pps may not be ready before the first slice
* header. In this case it is not a good idea to _get_sps()/_pps() at this
* point
* TODO: scan one round beforehand for SPS/PPS before decoding slice headers?
* */
/* TODO: separate_color_plane_flag: from SPS, not implemented yet, assumed to
* be false */
h->frame_num =
gst_nal_bs_read (bs, h->sps->log2_max_pic_order_cnt_lsb_minus4 + 4);
if (!h->sps && !h->sps->frame_mbs_only_flag) {
h->field_pic_flag = gst_nal_bs_read (bs, 1);
if (h->field_pic_flag)
h->bottom_field_flag = gst_nal_bs_read (bs, 1);
}
/* not parsing the rest for the time being */
return TRUE;
}
GST_BOILERPLATE (GstH264Parse, gst_h264_parse, GstElement, GST_TYPE_ELEMENT);
static void gst_h264_parse_finalize (GObject * object);