How can I select the top front microphone on an iOS device using Qt? I’m currently using some code to list the available audio input devices, but it only detects a single default microphone. I need to find a way to specifically choose the top front microphone instead of the default bottom one for my application. Could someone explain how to achieve this or point me to the relevant documentation?

OK, I found the cause of the problem. Well, the problem is the right combination of codec, format and QMediaRecorder configuration. In the case of my systems, it turned out that they do not support WAV. Using AAC and a bitrate of 256kbit solved the problem. Previously I tried with AAC and 320kbit but the codec does not work with such a high bitrate and there was no error message.

Thank you for your help, I've probably identified the problem - one of the input parameters was a char (8 bit). I've tried to fix it using the following code to reformat it so that it can be used properly for 16 bit but I keep getting the same problem

/* Function with char as one of the parameters - qint64 XYSeriesIODevice::writeData(const char *data, qint64 maxSize) - same as in the Qt audio example**/ int bitsPerSample = 16; int bytesPerSample = (bitsPerSample / BITS_IN_BYTE); int signalLength = (strlen(data) ) / numChannels / bytesPerSample; short* signal = (short*)malloc(sizeof(short) * signalLength); for(int i = 0; i < signalLength; i++){ int index = i * numChannels * bytesPerSample; memcpy(&signal[i], &data[index], sizeof(short)); }

Any suggestions?

Hi and welcome to devnet,

That's exactly what the example shows how to do. Take a look at the toggleRecord function. It's there that the recording starts.