[vlc-devel] [PATCH 3/3] mediacodec: implementation of MediaCodec direct rendering based on the work by Martin Storsjö.

Martin Storsjö martin at martin.st
Sat Dec 21 21:45:54 CET 2013

On Sun, 15 Dec 2013, Martin Storsjö wrote:

> On Sun, 15 Dec 2013, Martin Storsjö wrote:
>> On Sat, 14 Dec 2013, Felix Abecassis wrote:
>>> 2013/12/13 Martin Storsjö <martin at martin.st>:
>>>> In general this seems to work pretty well on my Galaxy S3 now - kudos for
>>>> that. However, if pausing the video, waiting for a little while (a few
>>>> seconds) and then pressing the back key to exit, something somewhere 
>>>> seems
>>>> to deadlock.
>>> Which sample did you use?
>> I ran into the issue with the casino royale trailer that I think I've 
>> shared with you before. I don't run into it with a few other samples, and 
>> not on my Nexus 7 either.
>> I had a quick look at what's happening, and looks like something that can 
>> happen on almost any device/sample: The decoder has used up all the output 
>> buffers so it's blocked in DecodeVideo waiting for a free input or output 
>> buffer. Since the video gets paused, it won't try to render any more of the 
>> buffered pictures yet, so the decoder thread is basically blocked there 
>> until somebody frees one of the buffered pictures. Now when I press the 
>> back key to exit, it doesn't free the list of already output pictures (not 
>> just yet at least), probably waiting for the DecodeVideo call to return.
>> So something from elsewhere would need to tell the video decoder thread to 
>> give up/abort
> So after a few more minutes of digging around, I see that this actually 
> already is taken care of. By adding this into the MediaCodec loop that waits 
> for a ready input/output buffer, this seem to work just fine for me:
> +            if (!vlc_object_alive(p_dec)) {
> +                (*myVm)->DetachCurrentThread(myVm);
> +                return NULL;
> +            }

Will there be another iteration of this patch, or should I just go ahead 
and commit it if there's no further comments? Or should it be committed 
but disabled by default until the subtitles support is implemented?

// Martin

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