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tee: Allocate one more buffer when multi-plexing

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This extra buffer ensure that the downstream threads are not starved
when multiplexing a stream.

https://bugzilla.gnome.org/show_bug.cgi?id=730758
This commit is contained in:
Nicolas Dufresne 2017-09-05 15:57:51 -04:00
parent 291400d819
commit 1cd0dd3503
2 changed files with 10 additions and 1 deletions
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8
plugins/elements/gsttee.c
View file

@ -573,6 +573,7 @@ struct AllocQueryCtx
guint size;
guint min_buffers;
gboolean first_query;
guint num_pads;
};
/* This function will aggregate some of the allocation query information with
@ -715,6 +716,7 @@ gst_tee_query_allocation (const GValue * item, GValue * ret, gpointer user_data)
}
ctx->first_query = FALSE;
ctx->num_pads++;
gst_query_unref (query);
return TRUE;
@ -758,6 +760,7 @@ gst_tee_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
gst_allocation_params_init (&ctx.params);
ctx.size = 0;
ctx.min_buffers = 0;
ctx.num_pads = 0;
gst_tee_clear_query_allocation_meta (query);
}
@ -789,6 +792,11 @@ gst_tee_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
}
#endif
/* Allocate one more buffers when multiplexing so we don't starve the
* downstream threads. */
if (ctx.num_pads > 1)
ctx.min_buffers++;
gst_query_add_allocation_param (ctx.query, NULL, &ctx.params);
gst_query_add_allocation_pool (ctx.query, NULL, ctx.size,
ctx.min_buffers, 0);

3
tests/check/elements/tee.c
View file

@ -802,7 +802,8 @@ GST_START_TEST (test_allocation_query)
fail_unless (gst_query_get_n_allocation_pools (query), 1);
gst_query_parse_nth_allocation_pool (query, 0, NULL, &size, &min, &max);
fail_unless (size == 130);
fail_unless (min == 2);
/* The tee will allocate one more buffer when multiplexing */
fail_unless (min == 2 + 1);
fail_unless (max == 0);
fail_unless (gst_query_get_n_allocation_params (query), 1);