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h264parse: recognize more types of NAL

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Also recognizes NALs carrying VCL (i.e. visible pictures). We
typically only compute timestamps for such NALs
This commit is contained in:
Lin YANG 2009-08-17 17:58:46 +08:00 committed by Sebastian Dröge
parent 550f60111c
commit 9c08ece157
1 changed files with 61 additions and 36 deletions
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97
gst/h264parse/gsth264parse.c
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@ -1066,7 +1066,9 @@ gst_h264_parse_chain_forward (GstH264Parse * h264parse, gboolean discont,
/* Figure out if this is a delta unit */ /* Figure out if this is a delta unit */
{ {
gint nal_type, nal_ref_idc; GstNalUnitType nal_type;
gint nal_ref_idc;
GstNalBs bs;
nal_type = (data[0] & 0x1f); nal_type = (data[0] & 0x1f);
nal_ref_idc = (data[0] & 0x60) >> 5; nal_ref_idc = (data[0] & 0x60) >> 5;
@ -1074,47 +1076,70 @@ gst_h264_parse_chain_forward (GstH264Parse * h264parse, gboolean discont,
GST_DEBUG_OBJECT (h264parse, "NAL type: %d, ref_idc: %d", nal_type, GST_DEBUG_OBJECT (h264parse, "NAL type: %d, ref_idc: %d", nal_type,
nal_ref_idc); nal_ref_idc);
gst_nal_bs_init (&bs, data + 1, avail - 1);
/* first parse some things needed to get to the frame type */ /* first parse some things needed to get to the frame type */
if (nal_type >= NAL_SLICE && nal_type <= NAL_SLICE_IDR) { switch (nal_type) {
GstNalBs bs; case NAL_SLICE:
gint first_mb_in_slice, slice_type; case NAL_SLICE_DPA:
case NAL_SLICE_DPB:
case NAL_SLICE_DPC:
case NAL_SLICE_IDR:
{
gint first_mb_in_slice, slice_type;
gst_nal_bs_init (&bs, data + 1, avail - 1); gst_nal_decode_slice_header (h264parse, &bs);
first_mb_in_slice = h264parse->first_mb_in_slice;
slice_type = h264parse->slice_type;
first_mb_in_slice = gst_nal_bs_read_ue (&bs); GST_DEBUG_OBJECT (h264parse, "first MB: %d, slice type: %d",
slice_type = gst_nal_bs_read_ue (&bs); first_mb_in_slice, slice_type);
GST_DEBUG_OBJECT (h264parse, "first MB: %d, slice type: %d", switch (slice_type) {
first_mb_in_slice, 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");
got_frame = TRUE;
break;
}
break;
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) { case NAL_SEI:
/* This can be considered as a non delta unit */ GST_DEBUG_OBJECT (h264parse, "we have an SEI NAL");
GST_DEBUG_OBJECT (h264parse, "we have a SPS or PPS NAL"); gst_nal_decode_sei (h264parse, &bs);
delta_unit = FALSE; break;
case NAL_SPS:
GST_DEBUG_OBJECT (h264parse, "we have an SPS NAL");
gst_nal_decode_sps (h264parse, &bs);
break;
case NAL_PPS:
GST_DEBUG_OBJECT (h264parse, "we have a PPS NAL");
gst_nal_decode_pps (h264parse, &bs);
break;
case NAL_AU_DELIMITER:
GST_DEBUG_OBJECT (h264parse, "we have an access unit delimiter.");
break;
default:
GST_DEBUG_OBJECT (h264parse,
"NAL of nal_type = %d encountered but not parsed", nal_type);
} }
} }