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codecparsers: Variant of _identify_nalu without checks

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This is useful for cases where the caller *knows* that the provided
input contains a whole NALU and can therefore avoid:
* the expensive checks for the next start code (which won't be present)
* delaying the input parsing (since we would need the next incoming NALU
  in order for the parsing code to detect the next start code)

https://bugzilla.gnome.org/show_bug.cgi?id=665584
This commit is contained in:
Edward Hervey 2011-12-05 11:47:57 +01:00
parent 9604342af3
commit c4d987b6d3
2 changed files with 51 additions and 5 deletions
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52
gst-libs/gst/codecparsers/gsth264parser.c
View file

@ -1150,22 +1150,28 @@ gst_h264_nal_parser_free (GstH264NalParser * nalparser)
}
/**
* gst_h264_parser_identify_nalu:
* gst_h264_parser_identify_nalu_unchecked:
* @nalparser: a #GstH264NalParser
* @data: The data to parse
* @offset: the offset from which to parse @data
* @size: the size of @data
* @nalu: The #GstH264NalUnit where to store parsed nal headers
*
* Parses @data and fills @nalu from the next nalu data from @data
* Parses @data and fills @nalu from the next nalu data from @data.
*
* This differs from @gst_h264_parser_identify_nalu in that it doesn't
* check whether the packet is complete or not.
*
* Note: Only use this function if you already know the provided @data
* is a complete NALU, else use @gst_h264_parser_identify_nalu.
*
* Returns: a #GstH264ParserResult
*/
GstH264ParserResult
gst_h264_parser_identify_nalu (GstH264NalParser * nalparser,
gst_h264_parser_identify_nalu_unchecked (GstH264NalParser * nalparser,
const guint8 * data, guint offset, gsize size, GstH264NalUnit * nalu)
{
gint off1, off2;
gint off1;
if (size < offset + 4) {
GST_DEBUG ("Can't parse, buffer has too small size %" G_GSIZE_FORMAT
@ -1188,12 +1194,14 @@ gst_h264_parser_identify_nalu (GstH264NalParser * nalparser,
nalu->valid = TRUE;
nalu->sc_offset = offset + off1;
/* sc might have 2 or 3 0-bytes */
if (nalu->sc_offset > 0 && data[nalu->sc_offset - 1] == 00)
nalu->sc_offset--;
nalu->offset = offset + off1 + 3;
nalu->data = (guint8 *) data;
set_nalu_datas (nalu);
if (nalu->type == GST_H264_NAL_SEQ_END ||
@ -1203,6 +1211,37 @@ gst_h264_parser_identify_nalu (GstH264NalParser * nalparser,
return GST_H264_PARSER_OK;
}
nalu->size = size - nalu->offset;
return GST_H264_PARSER_OK;
}
/**
* gst_h264_parser_identify_nalu:
* @nalparser: a #GstH264NalParser
* @data: The data to parse
* @offset: the offset from which to parse @data
* @size: the size of @data
* @nalu: The #GstH264NalUnit where to store parsed nal headers
*
* Parses @data and fills @nalu from the next nalu data from @data
*
* Returns: a #GstH264ParserResult
*/
GstH264ParserResult
gst_h264_parser_identify_nalu (GstH264NalParser * nalparser,
const guint8 * data, guint offset, gsize size, GstH264NalUnit * nalu)
{
GstH264ParserResult res;
gint off2;
res =
gst_h264_parser_identify_nalu_unchecked (nalparser, data, offset, size,
nalu);
if (res != GST_H264_PARSER_OK || nalu->size == 0)
goto beach;
off2 = scan_for_start_codes (data + nalu->offset, size - nalu->offset);
if (off2 < 0) {
GST_DEBUG ("Nal start %d, No end found", nalu->offset);
@ -1218,9 +1257,12 @@ gst_h264_parser_identify_nalu (GstH264NalParser * nalparser,
return GST_H264_PARSER_BROKEN_DATA;
GST_DEBUG ("Complete nal found. Off: %d, Size: %d", nalu->offset, nalu->size);
return GST_H264_PARSER_OK;
beach:
return res;
}
/**
* gst_h264_parser_identify_nalu_avc:
* @nalparser: a #GstH264NalParser

4
gst-libs/gst/codecparsers/gsth264parser.h
View file

@ -678,6 +678,10 @@ GstH264ParserResult gst_h264_parser_identify_nalu (GstH264NalParser *nalpars
const guint8 *data, guint offset,
gsize size, GstH264NalUnit *nalu);
GstH264ParserResult gst_h264_parser_identify_nalu_unchecked (GstH264NalParser *nalparser,
const guint8 *data, guint offset,
gsize size, GstH264NalUnit *nalu);
GstH264ParserResult gst_h264_parser_identify_nalu_avc (GstH264NalParser *nalparser, const guint8 *data,
guint offset, gsize size, guint8 nal_length_size,
GstH264NalUnit *nalu);