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Handle 24hr wrap of QAudioInput::elapsedUSecs() on Linux & Windows

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This commit is contained in:
Bill Somerville 2020-08-22 18:09:51 +01:00
parent d522239492
commit d1fa08ab78
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GPG Key ID: D864B06D1E81618F
2 changed files with 15 additions and 6 deletions
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18
Audio/soundin.cpp
View File

@ -1,5 +1,7 @@
#include "soundin.h"
#include <cstdlib>
#include <cmath>
#include <QAudioDeviceInfo>
#include <QAudioFormat>
#include <QAudioInput>
@ -166,15 +168,21 @@ void SoundInput::reset (bool report_dropped_frames)
{
if (m_stream)
{
if (cummulative_lost_usec_ >= 0 // don't report first time as we
// don't yet known latency
&& report_dropped_frames)
auto elapsed_usecs = m_stream->elapsedUSecs ();
while (std::abs (elapsed_usecs - m_stream->processedUSecs ())
> 24 * 60 * 60 * 500000ll) // half day
{
auto lost_usec = m_stream->elapsedUSecs () - m_stream->processedUSecs () - cummulative_lost_usec_;
// QAudioInput::elapsedUSecs() wraps after 24 hours
elapsed_usecs += 24 * 60 * 60 * 1000000ll;
}
// don't report first time as we don't yet known latency
if (cummulative_lost_usec_ != std::numeric_limits<qint64>::min () && report_dropped_frames)
{
auto lost_usec = elapsed_usecs - m_stream->processedUSecs () - cummulative_lost_usec_;
Q_EMIT dropped_frames (m_stream->format ().framesForDuration (lost_usec), lost_usec);
//qDebug () << "SoundInput::reset: frames dropped:" << m_stream->format ().framesForDuration (lost_usec) << "sec:" << lost_usec / 1.e6;
}
cummulative_lost_usec_ = m_stream->elapsedUSecs () - m_stream->processedUSecs ();
cummulative_lost_usec_ = elapsed_usecs - m_stream->processedUSecs ();
}
}

3
Audio/soundin.h
View File

@ -2,6 +2,7 @@
#ifndef SOUNDIN_H__
#define SOUNDIN_H__
#include <limits>
#include <QObject>
#include <QString>
#include <QDateTime>
@ -24,7 +25,7 @@ public:
SoundInput (QObject * parent = nullptr)
: QObject {parent}
, m_sink {nullptr}
, cummulative_lost_usec_ {0}
, cummulative_lost_usec_ {std::numeric_limits<qint64>::min ()}
{
}