Re: [FFmpeg-devel] [PATCH v2] avcodec/av1dec: convert to receive_frame()

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

James Almer:
> On 5/20/2023 1:59 PM, Andreas Rheinhardt wrote:
>> James Almer:
>>> On 5/20/2023 1:12 PM, Anton Khirnov wrote:
>>>> Quoting James Almer (2023-05-20 03:50:57)
>>>>> Signed-off-by: James Almer <jamrial@gmail.com>
>>>>> ---
>>>>>    libavcodec/av1dec.c | 75
>>>>> +++++++++++++++++++++++++++++++++------------
>>>>>    libavcodec/av1dec.h |  4 +++
>>>>>    2 files changed, 60 insertions(+), 19 deletions(-)
>>>>
>>>> The patch makes the code longer and introduces an evil backward goto.
>>>> So some comment on why is this an improvement would be appropriate.
>>>
>>> It's an improvement because it removes the auto-inserted av1_frame_split
>>> from the process, making the decoder handle temporal units with more
>>> than one frame in them on its own. I can add that to the commit message.
>>>
>>> The extra code is inevitable because it's the decoder who now needs to
>>> fetch the packet instead of the generic code in decode.c
>>
>> 1. Where is the improvement in that? What is so bad about using a BSF to
>> preprocess packets in this way?
> 
> Much less overhead? One less instance of CBS, less function calls, less
> packet references generated and moved around, etc.
> 

This is AV1, not annex B H.2645.

- Andreas

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