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baseparse: prevent excessively high memory usage with long streams

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Large streams would index one frame every second, which can get quite
large with multi-hour streams, so add an additional byte-based
minimum distance as well, which will kick in for long streams
and make sure we never have more than a couple of thousand index
entries.

https://bugzilla.gnome.org/show_bug.cgi?id=666053
This commit is contained in:
Vincent Penquerc'h 2012-06-13 13:02:48 +01:00 committed by Tim-Philipp Müller
parent 21a74a6b79
commit 37a72b1a82
1 changed files with 18 additions and 3 deletions
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21
libs/gst/base/gstbaseparse.c
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@ -218,6 +218,7 @@
#define MIN_FRAMES_TO_POST_BITRATE 10
#define TARGET_DIFFERENCE (20 * GST_SECOND)
#define MAX_INDEX_ENTRIES 4096
GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
#define GST_CAT_DEFAULT gst_base_parse_debug
@ -304,6 +305,7 @@ struct _GstBaseParsePrivate
gint64 upstream_size;
/* minimum distance between two index entries */
GstClockTimeDiff idx_interval;
guint64 idx_byte_interval;
/* ts and offset of last entry added */
GstClockTime index_last_ts;
gint64 index_last_offset;
@ -743,6 +745,7 @@ gst_base_parse_reset (GstBaseParse * parse)
parse->priv->upstream_size = 0;
parse->priv->upstream_has_duration = FALSE;
parse->priv->idx_interval = 0;
parse->priv->idx_byte_interval = 0;
parse->priv->exact_position = TRUE;
parse->priv->seen_keyframe = FALSE;
@ -1565,9 +1568,11 @@ gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
/* FIXME need better helper data structure that handles these issues
* related to ongoing collecting of index entries */
if (parse->priv->index_last_offset >= (gint64) offset) {
GST_DEBUG_OBJECT (parse, "already have entries up to offset "
"0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
(gint64) offset) {
GST_LOG_OBJECT (parse,
"already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
parse->priv->index_last_offset + parse->priv->idx_byte_interval);
goto exit;
}
@ -1627,6 +1632,7 @@ gst_base_parse_check_seekability (GstBaseParse * parse)
gboolean seekable = FALSE;
gint64 start = -1, stop = -1;
guint idx_interval = 0;
guint64 idx_byte_interval = 0;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (!gst_pad_peer_query (parse->sinkpad, query)) {
@ -1657,6 +1663,14 @@ gst_base_parse_check_seekability (GstBaseParse * parse)
idx_interval = 500;
else
idx_interval = 1000;
/* ensure that even for large files (e.g. very long audio files), the index
* stays reasonably-size, with some arbitrary limit to the total number of
* index entries */
idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
GST_DEBUG_OBJECT (parse,
"Limiting index entries to %d, indexing byte interval %"
G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
}
done:
@ -1669,6 +1683,7 @@ done:
GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
parse->priv->idx_interval = idx_interval * GST_MSECOND;
parse->priv->idx_byte_interval = idx_byte_interval;
}
/* some misc checks on upstream */