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mpegtspacketizer: Speed up section parsing

Browse source 
Only create subtables when needed. It was previously creating one every
single time ... to check if one was present.
And speed up code to detect whether a subtable was already present or not.

Overall makes section pushing 2 times faster.
This commit is contained in:
Edward Hervey 2013-06-23 15:12:58 +02:00
parent 15e3afc099
commit f9b3b46ab5
1 changed files with 17 additions and 18 deletions
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35
gst/mpegtsdemux/mpegtspacketizer.c
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@ -306,18 +306,20 @@ flush_observations (MpegTSPacketizer2 * packetizer)
priv->lastobsid = 0;
}
static gint
mpegts_packetizer_stream_subtable_compare (gconstpointer a, gconstpointer b)
static inline MpegTSPacketizerStreamSubtable *
find_subtable (GSList * subtables, guint8 table_id, guint16 subtable_extension)
{
MpegTSPacketizerStreamSubtable *asub, *bsub;
GSList *tmp;
asub = (MpegTSPacketizerStreamSubtable *) a;
bsub = (MpegTSPacketizerStreamSubtable *) b;
for (tmp = subtables; tmp; tmp = tmp->next) {
MpegTSPacketizerStreamSubtable *sub =
(MpegTSPacketizerStreamSubtable *) tmp->data;
if (sub->table_id == table_id
&& sub->subtable_extension == subtable_extension)
return sub;
}
if (asub->table_id == bsub->table_id &&
asub->subtable_extension == bsub->subtable_extension)
return 0;
return -1;
return FALSE;
}
static gboolean
@ -618,7 +620,6 @@ mpegts_packetizer_parse_section_header (MpegTSPacketizer2 * packetizer,
guint8 tmp;
guint8 *data, *crc_data;
MpegTSPacketizerStreamSubtable *subtable;
GSList *subtable_list = NULL;
section->complete = TRUE;
/* get the section buffer, ownership stays with the stream */
@ -644,20 +645,18 @@ mpegts_packetizer_parse_section_header (MpegTSPacketizer2 * packetizer,
else
section->subtable_extension = GST_READ_UINT16_BE (data + 2);
subtable = mpegts_packetizer_stream_subtable_new (section->table_id,
subtable =
find_subtable (stream->subtables, section->table_id,
section->subtable_extension);
subtable_list = g_slist_find_custom (stream->subtables, subtable,
mpegts_packetizer_stream_subtable_compare);
if (subtable_list) {
if (subtable) {
GST_DEBUG ("Found previous subtable_extension:%d",
section->subtable_extension);
g_free (subtable);
subtable = (MpegTSPacketizerStreamSubtable *) (subtable_list->data);
} else {
GST_DEBUG ("Appending new subtable_extension:%d",
section->subtable_extension);
subtable = mpegts_packetizer_stream_subtable_new (section->table_id,
section->subtable_extension);
stream->subtables = g_slist_prepend (stream->subtables, subtable);
}