StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POSample Grabber Sink release() issue
primarykey
Id
15341272
data
AcceptedAnswerId
15343651
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-03-11T14:37:23.320
FavoriteCount
0
LastActivityDate
2013-03-11T19:46:52.510
LastEditDate
2013-03-11T19:46:52.510
LastEditorUserId
1710254
OwnerUserId
1710254
ParentId
0
PostTypeId
1
Score
0
ViewCount
422
LastEditorDisplayName
text
Body
I use Sample Grabber Sink in my Media session using most of code from msdn sample. In OnProcessSample method I memcpy data to media buffer, attach it to MFSample and put this one into main process pointer. Problem is I either get memory leaking or crashes in ntdll.dll <blockquote> ntdll.dll!@RtlpLowFragHeapFree@8() Unknown </blockquote> SampleGrabberSink: <pre><code>OnProcessSample(...) { MFCreateMemoryBuffer(dwSampleSize,&tmpBuff); tmpBuff->Lock(&data,NULL,NULL); memcpy(data,pSampleBuffer,dwSampleSize); tmpBuff->Unlock(); MFCreateSample(&tmpSample); tmpSample->AddBuffer(tmpBuff); while(!(*Free) && (*pSample)!=NULL) { Sleep(1); } (*Free)=false; (*pSample)=tmpSample; (*Free)=true; SafeRelease(&tmpBuff); } </code></pre> in main thread <pre><code>ReadSample() { if(pSample==NULL) return; while(!Free) Sleep(1); Free=false; //process sample into dx surface// SafeRelease(&pSample); Free=true; } </code></pre> //hr checks omitted// With this code i get that ntdll.dll error after playing few vids. I also tried to push samples in qeue so OnProcess doesn't have to wait but then some memory havent free after video ended. (even now it practicaly doesn't wait, Session rate is 1 and main process can read more than 60fps) EDIT: It was thread synchronization problem. Solved by using <a href="http://msdn.microsoft.com/en-us/library/ms682530%28VS.85%29.aspx%3a" rel="nofollow">critical section</a> thanks to Roman R.
Tags
<ms-media-foundation>
Title
Sample Grabber Sink release() issue
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USLeonidasCZ
UserOwnerUserId
1. USLeonidasCZ
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.