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INDI camera: accept fpack-compressed .fits.fz frames #1472

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Merged
agalasso merged 1 commit into from
Oct 20, 2026
Merged

INDI camera: accept fpack-compressed .fits.fz frames #1472

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10 changes: 8 additions & 2 deletions src/cam_indi.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -846,6 +846,12 @@ bool CameraINDI::ReadFITS(CapturedFrame *frame, usImage& img, bool takeSubframe,
return true;
}

// A ".fits.fz" frame (INDI drivers with compression enabled) is fpack'ed: an empty primary HDU
// followed by the tile-compressed image, which CFITSIO reads like an ordinary image HDU
bool compressed = strcmp(frame->m_format, ".fits.fz") == 0;
if (compressed)
fits_movabs_hdu(fptr, 2, nullptr, &status);

int hdutype;
if (fits_get_hdu_type(fptr, &hdutype, &status) || hdutype != IMAGE_HDU)
{
Expand All @@ -872,7 +878,7 @@ bool CameraINDI::ReadFITS(CapturedFrame *frame, usImage& img, bool takeSubframe,
PHD_fits_close_file(fptr);
return true;
}
if (nhdus != 1 || naxis != 2)
if (nhdus != (compressed ? 2 : 1) || naxis != 2)
{
pFrame->Alert(_("Unsupported FITS file"));
PHD_fits_close_file(fptr);
Expand Down Expand Up @@ -1119,7 +1125,7 @@ bool CameraINDI::Capture(usImage& img, const CaptureParams& captureParams)
first_frame = false;

// exposure complete, process the file
if (strcmp(frame->m_format, ".fits") == 0)
if (strcmp(frame->m_format, ".fits") == 0 || strcmp(frame->m_format, ".fits.fz") == 0)
{
if (INDIConfig::Verbose())
Debug.Write(wxString::Format("INDI Camera Processing fits file\n"));
Expand Down
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