Re: [FFmpeg-devel] [PATCH 08/11] avcodec/tests/avcodec: Check codec caps for consistency

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

Xiang, Haihao:
> On Fri, 2021-09-24 at 18:37 +0200, Andreas Rheinhardt wrote:
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>> ---
>>  libavcodec/tests/avcodec.c | 38 ++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 38 insertions(+)
>>
>> diff --git a/libavcodec/tests/avcodec.c b/libavcodec/tests/avcodec.c
>> index 5512ae99f7..e26315c368 100644
>> --- a/libavcodec/tests/avcodec.c
>> +++ b/libavcodec/tests/avcodec.c
>> @@ -19,6 +19,7 @@
>>  #include "libavutil/opt.h"
>>  #include "libavcodec/codec.h"
>>  #include "libavcodec/codec_desc.h"
>> +#include "libavcodec/internal.h"
>>  
>>  static const char *get_type_string(enum AVMediaType type)
>>  {
>> @@ -78,11 +79,26 @@ int main(void){
>>              if (codec->channel_layouts || codec->sample_fmts ||
>>                  codec->supported_samplerates)
>>                  ERR("Non-audio codec %s has audio-only fields set\n");
>> +            if (codec->capabilities & (AV_CODEC_CAP_SMALL_LAST_FRAME |
>> +                                       AV_CODEC_CAP_CHANNEL_CONF     |
>> +                                       AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
>> +                ERR("Non-audio codec %s has audio-only capabilities set\n");
>>          }
>>          if (codec->type != AVMEDIA_TYPE_VIDEO) {
>>              if (codec->pix_fmts || codec->supported_framerates)
>>                  ERR("Non-video codec %s has audio-only fields set\n");
>> +            if (codec->caps_internal & FF_CODEC_CAP_EXPORTS_CROPPING)
>> +                ERR("Non-video codec %s exports cropping\n");
>>          }
>> +        if (codec->caps_internal  & FF_CODEC_CAP_SLICE_THREAD_HAS_MF &&
>> +            !(codec->capabilities & AV_CODEC_CAP_SLICE_THREADS))
>> +            ERR("Codec %s wants mainfunction despite not being "
>> +                "slice-threading capable");
>> +        if (codec->caps_internal  & FF_CODEC_CAP_AUTO_THREADS &&
>> +            !(codec->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
>> +                                     AV_CODEC_CAP_SLICE_THREADS |
>> +                                     AV_CODEC_CAP_OTHER_THREADS)))
>> +            ERR("Codec %s has private-only threading support\n");
>>  
>>          is_decoder = av_codec_is_decoder(codec);
>>          is_encoder = av_codec_is_encoder(codec);
>> @@ -103,6 +119,19 @@ int main(void){
>>                      ret = 1;
>>                  }
>>              }
>> +            if (codec->caps_internal & (FF_CODEC_CAP_ALLOCATE_PROGRESS |
>> +                                        FF_CODEC_CAP_SETS_PKT_DTS |
>> +                                        FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
>> +                                        FF_CODEC_CAP_EXPORTS_CROPPING |
>> +                                        FF_CODEC_CAP_SETS_FRAME_PROPS) ||
>> +                codec->capabilities  & (AV_CODEC_CAP_AVOID_PROBING |
>> +                                        AV_CODEC_CAP_CHANNEL_CONF  |
>> +                                        AV_CODEC_CAP_DRAW_HORIZ_BAND |
>> +                                        AV_CODEC_CAP_SUBFRAMES))
>> +                ERR("Encoder %s has decoder-only capabilities set\n");
>> +            if (codec->capabilities & AV_CODEC_CAP_FRAME_THREADS &&
>> +                codec->capabilities & AV_CODEC_CAP_ENCODER_FLUSH)
>> +                ERR("Frame-threaded encoder %s claims to support
>> flushing\n");
> 
> I didn't see such requirement in codec.h and wonder why the two flags can't
> coexist, could you please provide a little more explanation ? 
> 

The only reason for this is that it is not implemented to flush an
encoder that uses frame threads.
(Do you have any specific encoder in mind?)

- Andreas
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