Re: [FFmpeg-devel] [PATCH v2 02/27] avcodec/decode: Add new ProgressFrame API

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Anton Khirnov:
> Quoting Andreas Rheinhardt (2024-04-10 09:09:00)
>> Anton Khirnov:
>>> Quoting Andreas Rheinhardt (2024-04-08 22:13:40)
>>>> diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
>>>> index fd356bd190..6b2c4312e0 100644
>>>> --- a/libavcodec/pthread_frame.c
>>>> +++ b/libavcodec/pthread_frame.c
>>>> @@ -779,6 +779,7 @@ static av_cold int init_thread(PerThreadContext *p, int *threads_to_free,
>>>>      if (!copy->internal)
>>>>          return AVERROR(ENOMEM);
>>>>      copy->internal->thread_ctx = p;
>>>> +    copy->internal->progress_frame_pool = avctx->internal->progress_frame_pool;
>>>
>>> I'd still prefer every thread to have its own reference.
>>>
>>> Looks good otherwise.
>>>
>>
>> The opaque of this pool is the main AVCodecContext; if the main
>> AVCodecContext is destroyed, the pool is in a state where one can no
>> longer get new entries from it. So giving every thread its own reference
>> is pretending to make it an equal co-owner of the pool, but it is not as
>> the pool must not outlive the main AVCodecContext.
> 
> But the only use of that opaque is checking whether frame threading is
> in use, which is a constant during decoder lifetime. Might be cleaner to
> avoid using AVCodecContext as opaque.
> In any case, this is not important, feel free to leave it as is.
> 

But whether frame threading is in use is only determined after
ff_decode_preinit().

- Andreas

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