Bug 576453 – [flacdec] blocks the seeking thread

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Bug 576453 - [flacdec] blocks the seeking thread


Summary:	[flacdec] blocks the seeking thread


Status:	RESOLVED DUPLICATE of bug 579422

Product:	GStreamer
Classification:	Platform
Component:	gst-plugins-good
Version:	git master
Hardware:	Other Linux

Importance:	Normal normal
Target Milestone:	git master
Assigned To:	GStreamer Maintainers
QA Contact:	GStreamer Maintainers

URL:
Whiteboard:

Depends on:
Blocks:

Reported:	2009-03-23 17:09 UTC by Alessandro Decina
Modified:	2009-05-06 12:59 UTC

See Also:
GNOME target:	---
GNOME version:	---

Description Alessandro Decina 2009-03-23 17:09:55 UTC

Seeking with flacdec can potentially block the seeking thread. In my case i'm seeking from the main thread and it's blocking because of a pad block.

FLAC__stream_decoder_seek_absolute seems to produce a buffer. flacdec has code to avoid calling gst_pad_push during seeking. It should also avoid calling gst_pad_alloc_buffer.

here's a traceback:

(gdb) bt

+ Trace 213777

#0 pthread_cond_wait
from /lib/libpthread.so.0
#1 handle_pad_block
at gstpad.c line 3866
#2 gst_pad_alloc_buffer_full
at gstpad.c line 2875
#3 gst_pad_alloc_buffer
at gstpad.c line 2995
#4 gst_proxy_pad_do_bufferalloc
at gstghostpad.c line 182
#5 gst_pad_buffer_alloc_unchecked
at gstpad.c line 2807
#6 gst_pad_alloc_buffer_full
at gstpad.c line 2884
#7 gst_pad_alloc_buffer
at gstpad.c line 2995
#8 gst_proxy_pad_do_bufferalloc
at gstghostpad.c line 182
#9 gst_pad_buffer_alloc_unchecked
#10 gst_pad_alloc_buffer_full
at gstpad.c line 2884
#11 gst_pad_alloc_buffer_and_set_caps
at gstpad.c line 3028
#12 gst_flac_dec_write
at gstflacdec.c line 1108
#13 gst_flac_dec_write_stream
at gstflacdec.c line 1219
#14 ??
from /usr/lib/libFLAC.so.8
#15 FLAC__stream_decoder_process_single
from /usr/lib/libFLAC.so.8
#16 FLAC__stream_decoder_seek_absolute
from /usr/lib/libFLAC.so.8
#17 gst_flac_dec_handle_seek_event
at gstflacdec.c line 1998
#18 gst_flac_dec_src_event
at gstflacdec.c line 2110
#19 gst_pad_send_event
#20 gst_pad_push_event
at gstpad.c line 4593
#21 gst_proxy_pad_do_event
at gstghostpad.c line 128
#22 gst_pad_send_event
at gstpad.c line 4737
#23 gst_pad_push_event
at gstpad.c line 4593
#24 gst_proxy_pad_do_event
at gstghostpad.c line 128
#25 ghostpad_event_function
at gnlobject.c line 703
#26 gst_pad_send_event
at gstpad.c line 4737
#27 update_pipeline
at gnlcomposition.c line 2036
#28 seek_handling
at gnlcomposition.c line 767
#29 handle_seek_event
at gnlcomposition.c line 804
#30 gnl_composition_event_handler
#31 gst_pad_send_event
at gstpad.c line 4737
#32 gst_pad_push_event
at gstpad.c line 4593
#33 gst_base_transform_src_eventfunc
at gstbasetransform.c line 1773
#34 _wrap_GstBaseTransform__do_src_event
at gstbase.override line 831
#35 PyEval_EvalFrameEx
at ../Python/ceval.c line 3595
#36 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#37 function_call
at ../Objects/funcobject.c line 517
#38 PyObject_Call
at ../Objects/abstract.c line 1861
#39 instancemethod_call
at ../Objects/classobject.c line 2519
#40 PyObject_Call
at ../Objects/abstract.c line 1861
#41 PyEval_CallObjectWithKeywords
at ../Python/ceval.c line 3464
#42 _wrap_GstBaseTransform__proxy_do_src_event
at gst.c line 19064
#43 gst_base_transform_src_event
at gstbasetransform.c line 1742
#44 gst_pad_send_event
at gstpad.c line 4737
#45 gst_pad_push_event
at gstpad.c line 4593
#46 gst_proxy_pad_do_event
at gstghostpad.c line 128
#47 gst_pad_send_event
at gstpad.c line 4737
#48 gst_pad_push_event
at gstpad.c line 4593
#49 gst_pad_event_default_dispatch
at gstpad.c line 3363
#50 gst_pad_event_default
at gstpad.c line 3437
#51 gst_pad_send_event
at gstpad.c line 4737
#52 gst_pad_push_event
#53 gst_queue_handle_src_event
at gstqueue.c line 1176
#54 gst_pad_send_event
at gstpad.c line 4737
#55 gst_pad_push_event
at gstpad.c line 4593
#56 gst_proxy_pad_do_event
at gstghostpad.c line 128
#57 gst_pad_send_event
at gstpad.c line 4737
#58 gst_pad_push_event
at gstpad.c line 4593
#59 gst_base_transform_src_eventfunc
at gstbasetransform.c line 1773
#60 gst_base_transform_src_event
at gstbasetransform.c line 1742
#61 gst_pad_send_event
at gstpad.c line 4737
#62 gst_pad_push_event
at gstpad.c line 4593
#63 gst_base_transform_src_eventfunc
at gstbasetransform.c line 1773
#64 gst_base_transform_src_event
at gstbasetransform.c line 1742
#65 gst_pad_send_event
at gstpad.c line 4737
#66 gst_pad_push_event
at gstpad.c line 4593
#67 gst_base_transform_src_eventfunc
at gstbasetransform.c line 1773
#68 gst_base_transform_src_event
at gstbasetransform.c line 1742
#69 gst_pad_send_event
at gstpad.c line 4737
#70 gst_pad_push_event
at gstpad.c line 4593
#71 gst_proxy_pad_do_event
at gstghostpad.c line 128
#72 gst_pad_send_event
at gstpad.c line 4737
#73 gst_pad_push_event
at gstpad.c line 4593
#74 gst_base_sink_send_event
at gstbasesink.c line 3603
#75 gst_element_send_event
#76 gst_bin_send_event
at gstbin.c line 2502
#77 gst_element_send_event
at gstelement.c line 1383
#78 gst_bin_send_event
at gstbin.c line 2502
#79 gst_element_send_event
at gstelement.c line 1383
#80 gst_bin_send_event
at gstbin.c line 2502
#81 gst_element_send_event
at gstelement.c line 1383
#82 gst_element_seek
at gstelement.c line 1423
#83 _wrap_gst_element_seek
at gst.c line 4774
#84 PyEval_EvalFrameEx
at ../Python/ceval.c line 3595
#85 PyEval_EvalCodeEx
#86 PyEval_EvalFrameEx
at ../Python/ceval.c line 3691
#87 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#88 function_call
at ../Objects/funcobject.c line 517
#89 PyObject_Call
at ../Objects/abstract.c line 1861
#90 instancemethod_call
at ../Objects/classobject.c line 2519
#91 PyObject_Call
at ../Objects/abstract.c line 1861
#92 PyEval_CallObjectWithKeywords
at ../Python/ceval.c line 3464
#93 pyg_closure_marshal
at pygtype.c line 1109
#94 IA__g_closure_invoke
#95 signal_emit_unlocked_R
at /build/buildd/glib2.0-2.18.2/gobject/gsignal.c line 3244
#96 pygobject_emit
at pygobject.c line 1734
#97 PyEval_EvalFrameEx
at ../Python/ceval.c line 3595
#98 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#99 function_call
at ../Objects/funcobject.c line 517
#100 PyObject_Call
at ../Objects/abstract.c line 1861
#101 PyEval_EvalFrameEx
at ../Python/ceval.c line 3875
#102 PyEval_EvalCodeEx
#103 function_call
at ../Objects/funcobject.c line 517
#104 PyObject_Call
at ../Objects/abstract.c line 1861
#105 PyEval_EvalFrameEx
at ../Python/ceval.c line 3875
#106 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#107 PyEval_EvalFrameEx
at ../Python/ceval.c line 3691
#108 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#109 function_call
at ../Objects/funcobject.c line 517
#110 PyObject_Call
at ../Objects/abstract.c line 1861
#111 instancemethod_call
#112 PyObject_Call
at ../Objects/abstract.c line 1861
#113 PyEval_CallObjectWithKeywords
at ../Python/ceval.c line 3464
#114 _pyglib_handler_marshal
at pyglib.c line 562
#115 g_timeout_dispatch
at /build/buildd/glib2.0-2.18.2/glib/gmain.c line 3589
#116 IA__g_main_context_dispatch
at /build/buildd/glib2.0-2.18.2/glib/gmain.c line 2144
#117 g_main_context_iterate
at /build/buildd/glib2.0-2.18.2/glib/gmain.c line 2778
#118 IA__g_main_loop_run
at /build/buildd/glib2.0-2.18.2/glib/gmain.c line 2986
#119 _wrap_g_main_loop_run
at pygmainloop.c line 319
#120 PyEval_EvalFrameEx
at ../Python/ceval.c line 3579
#121 PyEval_EvalFrameEx
at ../Python/ceval.c line 3681
#122 PyEval_EvalFrameEx
at ../Python/ceval.c line 3681
#123 PyEval_EvalFrameEx
at ../Python/ceval.c line 3681
#124 PyEval_EvalCodeEx
at ../Python/ceval.c line 2858
#125 PyEval_EvalCode
at ../Python/ceval.c line 514
#126 PyRun_FileExFlags
at ../Python/pythonrun.c line 1273
#127 PyRun_SimpleFileExFlags
at ../Python/pythonrun.c line 879
#128 Py_Main
at ../Modules/main.c line 532
#129 __libc_start_main
from /lib/libc.so.6
#130 _start

Comment 1 Edward Hervey 2009-05-06 12:59:18 UTC

Marking as duplicate of the other same bug report which , albeit more recent, has links to a fix.

*** This bug has been marked as a duplicate of 579422 ***