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vc1parse: parse frame header when stream format is ASF/raw for simple/main profile

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When stream-format is ASF or sequence-layer-raw-frame, we basically have
a raw frame so we can parse it to extract some information such the
keyframe flag. The only requirement is to have a valid sequence-header.

This commit parse the frame header and set the DELTA_UNIT buffer flag in
case the frame is not a keyframe.

https://bugzilla.gnome.org/show_bug.cgi?id=738519
This commit is contained in:
Aurélien Zanelli 2014-09-22 09:44:14 +02:00 committed by Sebastian Dröge
parent 981b5595d9
commit 6375fce925
1 changed files with 36 additions and 0 deletions
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36
gst/videoparsers/gstvc1parse.c
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@ -864,6 +864,14 @@ gst_vc1_parse_update_caps (GstVC1Parse * vc1parse)
return TRUE;
}
static inline void
calculate_mb_size (GstVC1SeqHdr * seqhdr, guint width, guint height)
{
seqhdr->mb_width = (width + 15) >> 4;
seqhdr->mb_height = (height + 15) >> 4;
seqhdr->mb_stride = seqhdr->mb_width + 1;
}
static gboolean
gst_vc1_parse_handle_bdu (GstVC1Parse * vc1parse, GstVC1StartCode startcode,
GstBuffer * buffer, guint offset, guint size)
@ -1174,6 +1182,34 @@ gst_vc1_parse_handle_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
/* Must be a frame or a frame + field */
/* TODO: Check if keyframe */
}
} else {
/* In simple/main, we basically have a raw frame, so parse it */
GstVC1ParserResult pres;
GstVC1FrameHdr frame_hdr;
GstVC1SeqHdr seq_hdr;
if (!vc1parse->seq_hdr_buffer) {
/* Build seq_hdr from sequence-layer to be able to parse frame */
seq_hdr.profile = vc1parse->profile;
seq_hdr.struct_c = vc1parse->seq_layer.struct_c;
calculate_mb_size (&seq_hdr, vc1parse->seq_layer.struct_a.horiz_size,
vc1parse->seq_layer.struct_a.vert_size);
} else {
seq_hdr = vc1parse->seq_hdr;
}
pres = gst_vc1_parse_frame_header (data, size, &frame_hdr,
&seq_hdr, NULL);
if (pres != GST_VC1_PARSER_OK) {
GST_ERROR_OBJECT (vc1parse, "Invalid VC1 frame header");
ret = GST_FLOW_ERROR;
goto done;
}
if (frame_hdr.ptype == GST_VC1_PICTURE_TYPE_I)
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
}
ret = GST_FLOW_OK;
} else {