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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. |
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.. | ||
tools | ||
BWFFile.cpp | ||
BWFFile.hpp |