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DvDif: detect synthetic gray/silence frames
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@JeromeMartinez
JeromeMartinez committed Dec 5, 2022
1 parent 8dffe5c commit 8b15ecf
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Showing 3 changed files with 66 additions and 5 deletions.
1 change: 1 addition & 0 deletions Source/MediaInfo/Multiple/File_DvDif.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,7 @@ File_DvDif::File_DvDif()
Speed_FrameCount_Stts_Fluctuation=0;
Speed_FrameCount_system[0]=0;
Speed_FrameCount_system[1]=0;
FrameIsNotFake=false;
FSC_WasSet_Sum=0;
FSC_WasNotSet_Sum=0;
AbstBf_Current=(0x7FFFFF)<<1;
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1 change: 1 addition & 0 deletions Source/MediaInfo/Multiple/File_DvDif.h
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,7 @@ protected :
Ztring Speed_RecDateZ_First;
Ztring Speed_RecDateZ_Last;
Ztring Speed_RecDateZ_Current;
bool FrameIsNotFake;
std::vector<size_t> Video_STA_Errors; //Per STA type
std::vector<size_t> Video_STA_Errors_ByDseq; //Per Dseq & STA type
std::vector<size_t> Video_STA_Errors_Total; //Per STA type
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69 changes: 64 additions & 5 deletions Source/MediaInfo/Multiple/File_DvDif_Analysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -296,6 +296,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecDate_Current.Years =Years;
Speed_RecDate_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}

Expand Down Expand Up @@ -330,6 +332,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecTime_Current.Time.Hours =Hours;
Speed_RecTime_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}
}
Expand Down Expand Up @@ -395,9 +399,9 @@ void File_DvDif::Read_Buffer_Continue()
+ ((Buffer[Buffer_Offset+3+Pos+3]&0x0F) ) ;
int8u Years =((Buffer[Buffer_Offset+3+Pos+4]&0xF0)>>4)*10
+ ((Buffer[Buffer_Offset+3+Pos+4]&0x0F) ) ;
if (Years<100
&& Months<=12
&& Days <=31)
if (Years<=99
&& Months && Months<=12
&& Days && Days<=31)
{
if (Speed_RecDate_Current.IsValid
&& Speed_RecDate_Current.Days !=Days
Expand All @@ -413,6 +417,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecDate_Current.Years =Years;
Speed_RecDate_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}

Expand Down Expand Up @@ -447,6 +453,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecTime_Current.Time.Hours =Hours;
Speed_RecTime_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}

Expand Down Expand Up @@ -481,6 +489,8 @@ void File_DvDif::Read_Buffer_Continue()
Captions_Flags.set(Caption_ParityIssueAny);
}
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}
}
Expand Down Expand Up @@ -532,8 +542,9 @@ void File_DvDif::Read_Buffer_Continue()
+ ((Buffer[Buffer_Offset+3+3]&0x0F) ) ;
int8u Years =((Buffer[Buffer_Offset+3+4]&0xF0)>>4)*10
+ ((Buffer[Buffer_Offset+3+4]&0x0F) ) ;
if (Months<=12
&& Days <=31)
if (Years<=99
&& Months && Months<=12
&& Days && Days<=31)
{
if (Speed_RecDate_Current.IsValid
&& Speed_RecDate_Current.Days !=Days
Expand All @@ -549,6 +560,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecDate_Current.Years =Years;
Speed_RecDate_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}

Expand Down Expand Up @@ -583,6 +596,8 @@ void File_DvDif::Read_Buffer_Continue()
Speed_RecTime_Current.Time.Hours =Hours;
Speed_RecTime_Current.IsValid =true;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
}

Expand Down Expand Up @@ -637,7 +652,39 @@ void File_DvDif::Read_Buffer_Continue()
BlockStatus[(File_Offset+Buffer_Offset-Speed_FrameCount_StartOffset)/80]=BlockStatus_OK;
}
else
{
BlockStatus[(File_Offset+Buffer_Offset-Speed_FrameCount_StartOffset)/80]=BlockStatus_OK;
if (!FrameIsNotFake)
{
if (QU==(int8u)-1)
{
//Let's wait
}
else
{
switch (QU)
{
case 0: //16-bit
{
for (size_t i=8; i<80; i+=2)
{
int16s Value=(int16s)BigEndian2int16u(Buffer+Buffer_Offset+i);
if (Value<=-8 || Value>=8)
{
FrameIsNotFake=true;
break;
}
}
}
break;
//TODO: check 0 and -1 for 12-bit
defaut:
FrameIsNotFake=true;
break;
}
}
}
}
}
}
break;
Expand Down Expand Up @@ -683,6 +730,15 @@ void File_DvDif::Read_Buffer_Continue()
uint8_t Dseq=Buffer[Buffer_Offset+1]>>4;
Video_STA_Errors_ByDseq[(Dseq<<4)|STA_Error]++;
}
if (!FrameIsNotFake)
FrameIsNotFake=true;
}
else
{
//Looking for empty video
static const unsigned char EmptyVideoTemplate[]={0xD1, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xD1, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xD1, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xD1, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
if (!FrameIsNotFake && memcmp(Buffer+Buffer_Offset+4, EmptyVideoTemplate, sizeof(EmptyVideoTemplate)))
FrameIsNotFake=true;
}
BlockStatus[(File_Offset+Buffer_Offset-Speed_FrameCount_StartOffset)/80]=STA_Error?BlockStatus_NOK:BlockStatus_OK;
}
Expand Down Expand Up @@ -1882,6 +1938,8 @@ void File_DvDif::Errors_Stats_Update()
Event1.BlockStatus=BlockStatus;
Event1.AbstBf=AbstBf_Current;
Event1.MoreFlags=MoreFlags;
if (!FrameIsNotFake)
Event1.MoreFlags|=1<<3;
if (MoreData)
{
Event1.MoreData=MoreData-sizeof(size_t);
Expand Down Expand Up @@ -1983,6 +2041,7 @@ void File_DvDif::Errors_Stats_Update()
Speed_Arb_Current.Clear();
Speed_FrameCount++;
Speed_FrameCount_system[system]++;
FrameIsNotFake=false;
REC_IsValid=false;
DirectionSpeed.clear();
audio_source_mode.clear();
Expand Down

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