Hi Sylvain, Good idea, how does this look? Anton -- I'm using an Airspy HF+ Discovery with the Soapy driver. Whenever I turn AGC off it stops receiving samples. On closer inspection, switching AGC off results in samples stalling for an extended period (hundreds of milliseconds). As such, we hit the timeout in SoapyAirspyHF::readStream() and return SOAPY_SDR_TIMEOUT (-1). Things go wrong at this point. It takes a long time before readStream() is called again, presumably because we returned 0 from work(). By this time our buffers have overflown, readStream() returns SOAPY_SDR_OVERFLOW (-2) and work() returns 0. We loop forever, continually overflowing buffers. Fix this by looping in soapy_source_c::work() when ->readStream returns SOAPY_SDR_OVERFLOW so that we consume the buffers straight away. Signed-off-by: Anton Blanchard &lt;anton(a)ozlabs.org&gt; --- lib/soapy/soapy_source_c.cc | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/lib/soapy/soapy_source_c.cc b/lib/soapy/soapy_source_c.cc index a645361..5c683c9 100644 --- a/lib/soapy/soapy_source_c.cc +++ b/lib/soapy/soapy_source_c.cc @@ -96,9 +96,14 @@ int soapy_source_c::work( int noutput_items, { int flags = 0; long long timeNs = 0; - int ret = _device->readStream( - _stream, &output_items[0], - noutput_items, flags, timeNs); + int ret; + int retries = 1; + + do { + ret = _device->readStream( + _stream, &output_items[0], + noutput_items, flags, timeNs); + } while (retries-- && (ret == SOAPY_SDR_OVERFLOW)); if (ret < 0) return 0; //call again return ret; -- 2.25.2