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Add the ability for decoders to specify their own clocks --- necessary for the

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Victor 9k. We now have _much_ better decoding for this platform.
This commit is contained in:
David Given
2019-04-16 01:13:28 +02:00
parent 79b12b4c82
commit 9b59e7025d
5 changed files with 36 additions and 6 deletions
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12
lib/decoders/decoders.cc
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@@ -47,9 +47,6 @@ static const std::string BLOCK_ELEMENTS[] =
*/
nanoseconds_t Fluxmap::guessClock() const
{
if (manualClockRate != 0.0)
return manualClockRate * 1000.0;
uint32_t buckets[256] = {};
size_t cursor = 0;
FluxmapReader fr(*this);
@@ -203,7 +200,14 @@ abort:
return rawbits;
}
nanoseconds_t AbstractDecoder::guessClock(Fluxmap& fluxmap) const
nanoseconds_t AbstractDecoder::guessClock(Fluxmap& fluxmap, unsigned physicalTrack) const
{
if (manualClockRate != 0.0)
return manualClockRate * 1000.0;
return guessClockImpl(fluxmap, physicalTrack);
}
nanoseconds_t AbstractDecoder::guessClockImpl(Fluxmap& fluxmap, unsigned) const
{
return fluxmap.guessClock();
}

3
lib/decoders/decoders.h
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@@ -24,7 +24,8 @@ class AbstractDecoder
public:
virtual ~AbstractDecoder() {}
virtual nanoseconds_t guessClock(Fluxmap& fluxmap) const;
nanoseconds_t guessClock(Fluxmap& fluxmap, unsigned physicalTrack) const;
virtual nanoseconds_t guessClockImpl(Fluxmap& fluxmap, unsigned physicalTrack) const;
virtual void decodeToSectors(const RawBits& bitmap, unsigned physicalTrack,
RawRecordVector& rawrecords, SectorVector& sectors) = 0;

2
lib/reader.cc
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@@ -146,7 +146,7 @@ void readDiskCommand(AbstractDecoder& decoder, const std::string& outputFilename
{
std::unique_ptr<Fluxmap> fluxmap = track->read();
nanoseconds_t clockPeriod = decoder.guessClock(*fluxmap);
nanoseconds_t clockPeriod = decoder.guessClock(*fluxmap, track->track);
if (clockPeriod == 0)
{
std::cout << " no clock detected; giving up" << std::endl;

23
lib/victor9k/decoder.cc
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@@ -119,3 +119,26 @@ int Victor9kDecoder::recordMatcher(uint64_t fifo) const
return 9;
return 0;
}
nanoseconds_t Victor9kDecoder::guessClockImpl(Fluxmap& fluxmap, unsigned physicalTrack) const
{
const nanoseconds_t BASE_CLOCK = 2065;
const double BASE_SPEED = 167.0;
if (physicalTrack < 4)
return BASE_CLOCK * BASE_SPEED / 237.9;
else if (physicalTrack < 16)
return BASE_CLOCK * BASE_SPEED / 224.5;
else if (physicalTrack < 27)
return BASE_CLOCK * BASE_SPEED / 212.2;
else if (physicalTrack < 38)
return BASE_CLOCK * BASE_SPEED / 199.9;
else if (physicalTrack < 49)
return BASE_CLOCK * BASE_SPEED / 187.6;
else if (physicalTrack < 60)
return BASE_CLOCK * BASE_SPEED / 175.3;
else if (physicalTrack < 71)
return BASE_CLOCK * BASE_SPEED / 163.0;
else
return BASE_CLOCK * BASE_SPEED / 149.6;
}

2
lib/victor9k/victor9k.h
View File

@@ -17,6 +17,8 @@ public:
SectorVector decodeToSectors(
const RawRecordVector& rawRecords, unsigned physicalTrack);
int recordMatcher(uint64_t fifo) const;
nanoseconds_t guessClockImpl(Fluxmap& fluxmap, unsigned physicalTrack) const;
};
#endif