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baseaudiosink: protect against ringbuffer disappearing while in a query

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Observed a case where the sink went to null-state during the query,
hence the ringbuffer-pointer was NULL, causing a crash.

Moving the ringbuffer-check code until after the query, and hold the
lock during the check and while using the spec-values. It should not matter
to the query wether the ringbuffer is present or not, and it actually
gets a time bit more time to get the ringbuffer set up in this case!

Fixes #635231
This commit is contained in:
Havard Graff 2010-11-25 17:01:04 +01:00 committed by Wim Taymans
parent 68e64770a0
commit 60ff7c0eb4
1 changed files with 10 additions and 7 deletions
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17
gst-libs/gst/audio/gstbaseaudiosink.c
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@ -417,13 +417,6 @@ gst_base_audio_sink_query (GstElement * element, GstQuery * query)
GST_DEBUG_OBJECT (basesink, "latency query");
if (!basesink->ringbuffer || !basesink->ringbuffer->spec.rate) {
GST_DEBUG_OBJECT (basesink,
"we are not yet negotiated, can't report latency yet");
res = FALSE;
goto done;
}
/* ask parent first, it will do an upstream query for us. */
if ((res =
gst_base_sink_query_latency (GST_BASE_SINK_CAST (basesink), &live,
@ -434,6 +427,15 @@ gst_base_audio_sink_query (GstElement * element, GstQuery * query)
if (live && us_live) {
GstRingBufferSpec *spec;
GST_OBJECT_LOCK (basesink);
if (!basesink->ringbuffer || !basesink->ringbuffer->spec.rate) {
GST_OBJECT_UNLOCK (basesink);
GST_DEBUG_OBJECT (basesink,
"we are not yet negotiated, can't report latency yet");
res = FALSE;
goto done;
}
spec = &basesink->ringbuffer->spec;
basesink->priv->us_latency = min_l;
@ -441,6 +443,7 @@ gst_base_audio_sink_query (GstElement * element, GstQuery * query)
min_latency =
gst_util_uint64_scale_int (spec->seglatency * spec->segsize,
GST_SECOND, spec->rate * spec->bytes_per_sample);
GST_OBJECT_UNLOCK (basesink);
/* we cannot go lower than the buffer size and the min peer latency */
min_latency = min_latency + min_l;