[Bug 779695] urisourcebin: Protect expose_output_pad() with lock

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779695

--- Comment #2 from Seungha Yang <sh.yang at lge.com> ---
<Error log>
0:00:00.167872375 15751 0x7190a600 DEBUG           urisourcebin
gsturisourcebin.c:920:new_demuxer_pad_added_cb:<dashdemux0> new demuxer pad,
name: <audio_00>. Added as pending pad with caps audio/x-m4a
0:00:00.167943833 15751 0x7190a600 DEBUG           urisourcebin
gsturisourcebin.c:920:new_demuxer_pad_added_cb:<dashdemux0> new demuxer pad,
name: <video_00>. Added as pending pad with caps video/quicktime
0:00:00.168089375 15751 0x7190a600 LOG             urisourcebin
gsturisourcebin.c:949:pending_pad_blocked:<urisourcebin0> Removing pad
<dashdemux0:video_00> from pending list
0:00:00.168567791 15751 0x72a02580 LOG             urisourcebin
gsturisourcebin.c:949:pending_pad_blocked:<urisourcebin0> Removing pad
<dashdemux0:audio_00> from pending list
0:00:00.168791083 15751 0x7190a600 LOG             urisourcebin
gsturisourcebin.c:1209:get_output_slot:<urisourcebin0> Adding queue for
adaptive streaming stream
0:00:00.169981250 15751 0x7190a600 LOG             urisourcebin
gsturisourcebin.c:978:pending_pad_blocked:<urisourcebin0> Pad
<dashdemux0:video_00> linked to slot 0x70e07a50
0:00:00.170351791 15751 0x72a02580 LOG             urisourcebin
gsturisourcebin.c:1209:get_output_slot:<urisourcebin0> Adding queue for
adaptive streaming stream
0:00:00.170905875 15751 0x7190a600 DEBUG               playbin3
gstplaybin3.c:5279:urisrc_pad_added:<playbin3-0> New pad <urisourcebin0:src_0>
from urisourcebin <urisourcebin0> linking to <decodebin3-0:sink>
0:00:00.171399750 15751 0x72a02580 LOG             urisourcebin
gsturisourcebin.c:978:pending_pad_blocked:<urisourcebin0> Pad
<dashdemux0:audio_00> linked to slot 0x70e0e338
0:00:00.171722916 15751 0x72a02580 DEBUG               playbin3
gstplaybin3.c:5279:urisrc_pad_added:<playbin3-0> New pad <urisourcebin0:src_1>
from urisourcebin <urisourcebin0> linking to <decodebin3-0:sink>
0:00:00.171872291 15751 0x72a02580 LOG               decodebin3
gstdecodebin3.c:1104:gst_decodebin3_input_pad_link:<decodebin3-0> Got link on
input pad <decodebin3-0:sink>. Creating parsebin if needed
0:00:00.171904291 15751 0x72a02580 LOG               decodebin3
gstdecodebin3.c:1109:gst_decodebin3_input_pad_link:<decodebin3-0> input locking
from thread 0x72a02580
0:00:00.171927291 15751 0x72a02580 LOG               decodebin3
gstdecodebin3.c:1109:gst_decodebin3_input_pad_link:<decodebin3-0> input locked
from thread 0x72a02580
0:00:00.173474250 15751 0x72a02580 DEBUG             decodebin3
gstdecodebin3.c:1516:gst_decodebin3_handle_message:<decodebin3-0> Got Message
state-changed
0:00:00.173568458 15751 0x72a02580 DEBUG             decodebin3
gstdecodebin3.c:1516:gst_decodebin3_handle_message:<decodebin3-0> Got Message
state-changed
0:00:00.173646958 15751 0x72a02580 DEBUG             decodebin3
gstdecodebin3.c:1516:gst_decodebin3_handle_message:<decodebin3-0> Got Message
async-start
0:00:00.173715791 15751 0x72a02580 FIXME               playbin3
gstplaybin3.c:3239:gst_play_bin3_handle_message:<playbin3-0>
ASYNC_START[decodebin3-0]: prerolling state ... current: READY, next: PAUSED,
pending: PAUSED
0:00:00.173808250 15751 0x7190a600 LOG               decodebin3
gstdecodebin3.c:1104:gst_decodebin3_input_pad_link:<decodebin3-0> Got link on
input pad <decodebin3-0:sink>. Creating parsebin if needed
0:00:00.173843041 15751 0x7190a600 LOG               decodebin3
gstdecodebin3.c:1109:gst_decodebin3_input_pad_link:<decodebin3-0> input locking
from thread 0x7190a600
0:00:00.173933500 15751 0x72a02580 DEBUG             decodebin3
gstdecodebin3.c:1516:gst_decodebin3_handle_message:<decodebin3-0> Got Message
state-changed
0:00:00.174017916 15751 0x72a02580 LOG               decodebin3
gstdecodebin3.c:1112:gst_decodebin3_input_pad_link:<decodebin3-0> input
unlocking from thread 0x72a02580
0:00:00.174057500 15751 0x7190a600 LOG               decodebin3
gstdecodebin3.c:1109:gst_decodebin3_input_pad_link:<decodebin3-0> input locked
from thread 0x7190a600
0:00:00.174391833 15751 0x7190a600 LOG               decodebin3
gstdecodebin3.c:1112:gst_decodebin3_input_pad_link:<decodebin3-0> input
unlocking from thread 0x7190a600
0:00:00.174083708 15751 0x72a02580 ERROR               playbin3
gstplaybin3.c:5293:urisrc_pad_added:<playbin3-0> failed to link pad
urisourcebin0:src_1 to decodebin, reason was linked (-2)

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