[FFmpeg-devel] [PATCH] avcodec/cbs_av1: add missing value range constrains to timecode Metadata OBU

James Almer jamrial at gmail.com
Mon Apr 29 01:49:24 EEST 2019


On 4/28/2019 7:28 PM, Mark Thompson wrote:
> On 17/04/2019 16:48, James Almer wrote:
>> Also infer the value time_offset_length as 0 when it's not present.
>>
>> Signed-off-by: James Almer <jamrial at gmail.com>
>> ---
>> Fun thing, this metadata OBU is clearly based on the H264/5 timecode SEI, yet
>> time_offset_length is unsigned here :p
>>
>>  libavcodec/cbs_av1_syntax_template.c | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/libavcodec/cbs_av1_syntax_template.c b/libavcodec/cbs_av1_syntax_template.c
>> index 59a98b18c9..b04cd51d55 100644
>> --- a/libavcodec/cbs_av1_syntax_template.c
>> +++ b/libavcodec/cbs_av1_syntax_template.c
>> @@ -1753,19 +1753,19 @@ static int FUNC(metadata_timecode)(CodedBitstreamContext *ctx, RWContext *rw,
>>      fb(9, n_frames);
>>  
>>      if (current->full_timestamp_flag) {
>> -        fb(6, seconds_value);
>> -        fb(6, minutes_value);
>> -        fb(5, hours_value);
>> +        fc(6, seconds_value, 0, 59);
> 
> What, no leap seconds?  :P

Not even the Linux Kernel could handle those properly at some point :p

> 
>> +        fc(6, minutes_value, 0, 59);
>> +        fc(5, hours_value,   0, 23);
>>      } else {
>>          flag(seconds_flag);
>>          if (current->seconds_flag) {
>> -            fb(6, seconds_value);
>> +            fc(6, seconds_value, 0, 59);
>>              flag(minutes_flag);
>>              if (current->minutes_flag) {
>> -                fb(6, minutes_value);
>> +                fc(6, minutes_value, 0, 59);
>>                  flag(hours_flag);
>>                  if (current->hours_flag)
>> -                    fb(5, hours_value);
>> +                    fc(5, hours_value, 0, 23);
>>              }
>>          }
>>      }
>> @@ -1773,6 +1773,8 @@ static int FUNC(metadata_timecode)(CodedBitstreamContext *ctx, RWContext *rw,
>>      fb(5, time_offset_length);
>>      if (current->time_offset_length > 0)
>>          fb(current->time_offset_length, time_offset_value);
>> +    else
>> +        infer(time_offset_length, 0);
>>  
>>      return 0;
>>  }
>>
> 
> LGTM.

Pushed. Look at the h2645 patchset set i sent before this patch as well
whenever you can.

Thanks!


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