[FFmpeg-devel] [PATCH v1] avcodec/av1dec: Add tile list OBU to decompose list

[Andreas Rheinhardt]

Wang, Fei W:
> On Wed, 2023-12-20 at 17:11 +0100, Andreas Rheinhardt wrote:
>> fei.w.wang-at-intel.com at ffmpeg.org:
>>> From: Fei Wang <fei.w.wang at intel.com>
>>>
>>> Show the unsupported message and return unsupported for clips
>>> contain
>>> tile list OBU since it hasn't been implemented. Otherwise, decoding
>>> maybe successful but result is incorrect.
>>>
>>> Signed-off-by: Fei Wang <fei.w.wang at intel.com>
>>> ---
>>>  libavcodec/av1dec.c | 5 +++++
>>>  1 file changed, 5 insertions(+)
>>>
>>> diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
>>> index 4dcde234c6..629e37c3f8 100644
>>> --- a/libavcodec/av1dec.c
>>> +++ b/libavcodec/av1dec.c
>>> @@ -805,6 +805,7 @@ static const CodedBitstreamUnitType
>>> decompose_unit_types[] = {
>>>      AV1_OBU_SEQUENCE_HEADER,
>>>      AV1_OBU_TEMPORAL_DELIMITER,
>>>      AV1_OBU_TILE_GROUP,
>>> +    AV1_OBU_TILE_LIST,
>>
>> What do you need this for? Decomposing it would only change whether
>> CodedBitstreamUnit.content is available, but you are only reading
>> CodedBitstreamUnit.type.
> 
> To show the unsupported error and let user know that there are tile
> list OBUs in bitstream that decoder can't handle them. Otherwise, like
> my commit mentioned, tile list obu bitsteam may be decoded 'successful'
> according to log.
> 

As I said: You do not need CodedBitstreamUnit.content for the error message.

>>
>>>  };
>>>  
>>>  static av_cold int av1_decode_init(AVCodecContext *avctx)
>>> @@ -1327,6 +1328,10 @@ static int
>>> av1_receive_frame_internal(AVCodecContext *avctx, AVFrame *frame)
>>>              }
>>>              break;
>>>          case AV1_OBU_TILE_LIST:
>>> +            av_log(avctx, AV_LOG_ERROR, "Large scale tile decoding
>>> is unsupported.\n");
>>> +            ret = AVERROR_PATCHWELCOME;
>>> +            goto end;
>>> +            break;
>>>          case AV1_OBU_TEMPORAL_DELIMITER:
>>>          case AV1_OBU_PADDING:
>>>              break;
>>
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