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Tool to exercise QAudioInput
The tool record_time_signal is designed to measure the performance of
QAudioInput. The intended use is to record a short period of live
audio from an on-air time signal of known good quaility, the basic
required parameters are an audio input device, an output file name
(.WAV), a start second in a minute, and a duration in seconds. So for
example to record the time signal ticks and fast data at the top of
the minute:
$ record_time_signal -o wwv.wav -s 55 -d 15
will record 15s of audio at 48000Hz sample rate, stereo, from the
default audio input device, starting at second 55. This will use a
separate timer to stop the recording which is likely to leave the
output file a little short due to buffer latency. The buffer size can
be adjusted using the '-b <buffered-frames>' option.
The tool also supoorts a different mechanism to time the recording
which uses the audio progress via a notify signal. This should ensure
at least the requested duration is recorded The shorter the notify
interval the closer teh final size shoould be to the requested
duration. Use the '-d <interval-ms>' option to adjust the notify
interval.
$ record_time_signal -o wwv.wav -s 55 -d 15 -n 100
Non-default audio devices can be selected, use the '-I' option to list
the available input devices with an index number that can be used to
select the device using the 'R <device-number>' option.
Other options are available, use '-h' for details.
This commit is contained in:
Bill Somerville
parent
10b3debe8f
commit
3a3af42cc6
231
Audio/tools/record_time_signal.cpp
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231
Audio/tools/record_time_signal.cpp
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#include <iostream>
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#include <exception>
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#include <stdexcept>
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#include <string>
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#include <locale.h>
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#include <QCoreApplication>
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#include <QTextStream>
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#include <QCommandLineParser>
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#include <QCommandLineOption>
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#include <QStringList>
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#include <QFileInfo>
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#include <QAudioFormat>
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#include <QAudioDeviceInfo>
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#include <QAudioInput>
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#include <QTimer>
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#include <QDateTime>
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#include "revision_utils.hpp"
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#include "Audio/BWFFile.hpp"
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namespace
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{
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QTextStream qtout {stdout};
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}
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class Recorder final
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: public QObject
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{
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Q_OBJECT;
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public:
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Recorder (int start, int duration, QString const& output, QAudioDeviceInfo const& source_device, QAudioFormat const& format, int notify_interval, int buffer_size)
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: source_ {source_device, format}
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, notify_interval_ {notify_interval}
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, output_ {format, output}
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, duration_ {duration}
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{
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if (!output_.open (BWFFile::WriteOnly)) throw std::invalid_argument {QString {"cannot open output file \"%1\""}.arg (output).toStdString ()};
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if (buffer_size) source_.setBufferSize (format.bytesForFrames (buffer_size));
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if (notify_interval_)
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{
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source_.setNotifyInterval (notify_interval);
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connect (&source_, &QAudioInput::notify, this, &Recorder::notify);
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}
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QTimer::singleShot (int ((((start - (QDateTime::currentMSecsSinceEpoch () / 1000) % 60) + 60) % 60) * 1000), Qt::PreciseTimer, this, &Recorder::start);
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}
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Q_SIGNAL void done ();
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private:
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Q_SLOT void start ()
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{
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qtout << "started recording at " << QDateTime::currentDateTimeUtc ().toString ("hh:mm:ss.zzz UTC") << endl;
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source_.start (&output_);
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if (!notify_interval_) QTimer::singleShot (duration_ * 1000, Qt::PreciseTimer, this, &Recorder::stop);
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qtout << QString {"buffer size used is: %1"}.arg (source_.bufferSize ()) << endl;
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}
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Q_SLOT void notify ()
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{
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auto length = source_.elapsedUSecs ();
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qtout << QString {"%1 US recorded\r"}.arg (length) << flush;
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if (length >= duration_ * 1000 * 1000) stop ();
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}
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Q_SLOT void stop ()
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{
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auto length = source_.elapsedUSecs ();
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source_.stop ();
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qtout << QString {"%1 uS recorded "}.arg (length) << '(' << source_.format ().framesForBytes (output_.size ()) << " frames recorded)\n";
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qtout << "stopped recording at " << QDateTime::currentDateTimeUtc ().toString ("hh:mm:ss.zzz UTC") << endl;
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Q_EMIT done ();
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}
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QAudioInput source_;
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int notify_interval_;
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BWFFile output_;
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int duration_;
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};
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#include "record_time_signal.moc"
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int main(int argc, char *argv[])
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{
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QCoreApplication app {argc, argv};
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try
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{
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::setlocale (LC_NUMERIC, "C"); // ensure number forms are in
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// consistent format, do this
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// after instantiating
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// QApplication so that Qt has
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// correct l18n
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// Override programs executable basename as application name.
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app.setApplicationName ("WSJT-X Record Time Signal");
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app.setApplicationVersion (version ());
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QCommandLineParser parser;
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parser.setApplicationDescription (
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"\nTool to determine and experiment with QAudioInput latencies\n\n"
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"\tUse the -I option to list available recording device numbers\n"
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);
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auto help_option = parser.addHelpOption ();
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auto version_option = parser.addVersionOption ();
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parser.addOptions ({
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{{"I", "list-audio-inputs"},
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app.translate ("main", "List the available audio input devices")},
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{{"s", "start-time"},
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app.translate ("main", "Record from <start-time> seconds"),
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app.translate ("main", "start-time")},
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{{"d", "duration"},
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app.translate ("main", "Recording <duration> seconds"),
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app.translate ("main", "duration")},
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{{"o", "output"},
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app.translate ("main", "Save output as <output-file>"),
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app.translate ("main", "output-file")},
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{{"f", "force"},
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app.translate ("main", "Overwrite existing file")},
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{{"r", "sample-rate"},
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app.translate ("main", "Record at <sample-rate>"),
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app.translate ("main", "sample-rate")},
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{{"c", "num-channels"},
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app.translate ("main", "Record <num> channels"),
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app.translate ("main", "num")},
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{{"R", "recording-device-number"},
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app.translate ("main", "Record from <device-number>"),
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app.translate ("main", "device-number")},
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{{"n", "notify-interval"},
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app.translate ("main", "use notify signals every <interval> milliseconds, zero to use a timer"),
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app.translate ("main", "interval")},
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{{"b", "buffer-size"},
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app.translate ("main", "audio buffer size <frames>"),
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app.translate ("main", "frames")},
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});
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parser.process (app);
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auto input_devices = QAudioDeviceInfo::availableDevices (QAudio::AudioInput);
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if (parser.isSet ("I"))
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{
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int n {0};
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for (auto const& device : input_devices)
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{
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qtout << ++n << " - [" << device.deviceName () << ']' << endl;
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}
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return 0;
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}
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bool ok;
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int start = parser.value ("s").toInt (&ok);
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if (!ok) throw std::invalid_argument {"start time not a number"};
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int duration = parser.value ("d").toInt (&ok);
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if (!ok) throw std::invalid_argument {"duration not a number"};
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int sample_rate {48000};
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if (parser.isSet ("r"))
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{
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sample_rate = parser.value ("r").toInt (&ok);
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if (!ok) throw std::invalid_argument {"sample rate not a number"};
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}
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int num_channels {2};
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if (parser.isSet ("c"))
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{
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num_channels = parser.value ("c").toInt (&ok);
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if (!ok) throw std::invalid_argument {"channel count not a number"};
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}
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int notify_interval {0};
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if (parser.isSet ("n"))
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{
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notify_interval = parser.value ("n").toInt (&ok);
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if (!ok) throw std::invalid_argument {"notify interval not a number"};
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}
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int buffer_size {0};
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if (parser.isSet ("b"))
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{
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buffer_size = parser.value ("b").toInt (&ok);
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if (!ok) throw std::invalid_argument {"buffer size not a number"};
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}
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int input_device {0};
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if (parser.isSet ("R"))
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{
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input_device = parser.value ("R").toInt (&ok);
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if (!ok || 0 >= input_device || input_device > input_devices.size ())
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{
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throw std::invalid_argument {"invalid recording device"};
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}
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}
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if (!parser.isSet ("o")) throw std::invalid_argument {"output file required"};
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QFileInfo ofi {parser.value ("o")};
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if (!ofi.suffix ().size () && ofi.fileName ()[ofi.fileName ().size () - 1] != QChar {'.'})
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{
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ofi.setFile (ofi.filePath () + ".wav");
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}
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if (!parser.isSet ("f") && ofi.isFile ())
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{
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throw std::invalid_argument {"set the `-force' option to overwrite an existing output file"};
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}
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QAudioFormat audio_format;
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audio_format.setSampleRate (sample_rate);
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audio_format.setChannelCount (num_channels);
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audio_format.setSampleSize (16);
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audio_format.setSampleType (QAudioFormat::SignedInt);
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audio_format.setCodec ("audio/pcm");
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auto source = input_device ? input_devices[input_device] : QAudioDeviceInfo::defaultInputDevice ();
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if (!source.isFormatSupported (audio_format))
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{
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qtout << "warning, requested format not supported, using nearest" << endl;
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audio_format = source.nearestFormat (audio_format);
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}
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// run the application
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Recorder record {start, duration, ofi.filePath (), source, audio_format, notify_interval, buffer_size};
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QObject::connect (&record, &Recorder::done, &app, &QCoreApplication::quit);
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return app.exec();
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}
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catch (std::exception const& e)
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{
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std::cerr << "Error: " << e.what () << '\n';
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}
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catch (...)
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{
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std::cerr << "Unexpected fatal error\n";
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throw; // hoping the runtime might tell us more about the exception
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}
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return -1;
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}
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@ -1289,6 +1289,9 @@ target_link_libraries (ft4sim_mult wsjt_fort wsjt_cxx)
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add_executable (ft4d lib/ft4/ft4d.f90 wsjtx.rc)
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target_link_libraries (ft4d wsjt_fort wsjt_cxx)
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add_executable (record_time_signal Audio/tools/record_time_signal.cpp)
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target_link_libraries (record_time_signal wsjt_cxx wsjt_qtmm wsjt_qt)
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endif(WSJT_BUILD_UTILS)
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# build the main application
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