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flacparse: locate next sync code more efficiently

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This commit is contained in:
Mark Nauwelaerts 2009-12-18 21:05:11 +01:00
parent e6f840690d
commit ebe8c69cc2
1 changed files with 18 additions and 2 deletions
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20
gst/audioparsers/gstflacparse.c
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@ -633,6 +633,9 @@ gst_flac_parse_check_valid_frame (GstBaseParse * parse, GstBuffer * buffer,
GstFlacParse *flacparse = GST_FLAC_PARSE (parse); GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
const guint8 *data = GST_BUFFER_DATA (buffer); const guint8 *data = GST_BUFFER_DATA (buffer);
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 4))
return FALSE;
if (flacparse->state == GST_FLAC_PARSE_STATE_INIT) { if (flacparse->state == GST_FLAC_PARSE_STATE_INIT) {
if (memcmp (GST_BUFFER_DATA (buffer), "fLaC", 4) == 0) { if (memcmp (GST_BUFFER_DATA (buffer), "fLaC", 4) == 0) {
GST_DEBUG_OBJECT (flacparse, "fLaC marker found"); GST_DEBUG_OBJECT (flacparse, "fLaC marker found");
@ -682,8 +685,21 @@ gst_flac_parse_check_valid_frame (GstBaseParse * parse, GstBuffer * buffer,
return FALSE; return FALSE;
} }
} else { } else {
GST_DEBUG_OBJECT (flacparse, "Sync code not found"); GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buffer);
return FALSE; gint off;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xfffc0000, 0xfff80000,
0, GST_BUFFER_SIZE (buffer));
if (off > 0) {
GST_DEBUG_OBJECT (parse, "Possible sync at buffer offset %d", off);
*skipsize = off;
return FALSE;
} else {
GST_DEBUG_OBJECT (flacparse, "Sync code not found");
*skipsize = GST_BUFFER_SIZE (buffer) - 3;
return FALSE;
}
} }
} }