Playing Wav over modem.

aha_1980

Another tip: get yourself a serial port monitor to see what you actually write to the serial port. This makes also sure you get the timing right.

Good luck :)

An other french

QByteArray data = wavFile->read(1024);

Ok for a truncate data of 1024b , qDebug show this. I put a newline after "

"\xB3\xDEV\xDD\xAA\xDB"
"c\xDA\xC6\xDA\t\xDD\xF4\xE0^\xE5\x89\xEB\xAC\xF0"
"7\xF6\x13\xFA\x9A\xFD\xCB\xFF"
"5\x02|\x04\xC3\x07\x84\x0B\x17\x12\xE0\x19\x90%\\0\xA7<>E!M\xF8Q7V|X\xC1YpY\xB4WBU&Q\xFAL.G\xBE"
"A7:R3\xA8*\\#\xAA\x1A\xCA\x13\xC5\x0B\xF6\x04\x8A\xFC)\xF5\xED\xEB\x96\xE2\n\xDB\x96\xD2"
"1\xCCS\xC5K\xC0\xF9\xBA\x1E\xB7P\xB3\x06\xB1v\xAF \xAF\xC8\xAFX\xB1\xD7\xB3"
"0\xB6\xEC\xB8\x96\xBBQ\xBF\xC8\xC2\x00\xC7j\xCA"
"2\xCE""3\xD1v\xD5\x9C\xD9\xC5\xDE\xC2\xE2\xDC\xE6\xF6\xE9t\xED\xD2\xF0"
"9\xF5\xD9\xF8~\xFC\xC0\xFE\x98\x00\x83\x01\xA8\x02$\x04\x94\x05g\x07\xC2\bf\n&\f\x98\x0E\x8C\x10p\x12\xB0\x13\xCB\x14\xC8\x15(\x17"

this part is strong :

%\\0\xA7<>E!M\xF8Q7V|X\xC1YpY\xB4WBU&Q\xFAL.G\xBE

I except to read something like this:

a9 de ce e4 86 e3 af e1 c8 de 64 e1 97 e0 ad df

Sure there is a conversion somewhere.

the last 16b line:

Qbebug \xE5\x06 \x05$\x06\xFF\x06\x13\x05*\xFF
wave file e5 06 20 05 24 06 ff 06 13 05 2a ff

I can anderstand /x but $ or * is an other way.

Ps: My purpose is to play wave on the phone

aha_1980

@An-other-french to output binary data for debugging, I recommend you to use QByteArray::toHex().

An other french

No way to play any sound.
In the purpose to see modem response, i want to show Modem answer.
So, i need to connect the serial com to the text object

connect (m_serial, &QSerialPort::readyRead, this, &MainWindow::readData);

void MainWindow::readData(){ 
QByteArray data = m_serial->readAll();
...
ui->textEdit->append("1-"+ data.left(data.size()));
...
}

My function don't make difference between input or output(response).

Do you have a idea to show them distinctly?

aha_1980

@An-other-french said in Playing Wav over modem.:

Your connect and the readAll in the slot looks good so far.

data.left(data.size())

What do you expect from this construct? It should be the same as data alone.

As suggested earlier, use a serial port monitor to see which commands you actually send to the modem and wheter it answers.

An other french

@aha_1980 said in Playing Wav over modem.:

data.left(data.size())

It's a tentative to cut the data. Just data is better.

As suggested earlier, use a serial port monitor to see which commands you actually send to the modem and wheter it answers.

I don t know how to distinct the write and the read. m_serial->readAll(); give all of us.

aha_1980

@An-other-french said in Playing Wav over modem.:

I don t know how to distinct the write and the read. m_serial->readAll(); give all of us.

Sorry, what do you mean? serial->readAll() returns everything that the modem has send to your program since the last serial->readAll() call.

That's why I recommended to use a serial port monitor, which captures the data between your program and the modem so you can easier debug.

An other french

To put header into the blocks send to the comserial, I need to size sample.
Show bellow a wave file header.

header  "RIFF>\xC1\x1B\x00WAVEfmt \x10\x00\x00\x00\x01\x00\x02\x00@\x1F\x00\x00\x80>\x00\x00\x02\x00\b\x00""data\b\xC0\x1B\x00\x7F\x7F\x7F\x7F"
header Hex data "52 49 46 46 3e c1 1b 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 40 1f 00 00 80 3e 00 00 02 00 08 00 64 61 74 61 08 c0 1b 00 7f 7f 7f 7f"

I need to get the Bitspersample with an offet of 34 and 4 bits long.

          QByteArray header = wavFile->read(48);                  // header of wave file (.... 00 **08 00** 64...)
           
           qint8 BitsPerSample =header.toHex().data()[34];       //And the [35]   after anderstand how to do                        
         
           qDebug() << "header "<< header ;
           qDebug() << "header "<< header.toHex(' ') ;
           qDebug() << "Bits per sample" << BitsPerSample;     // print out 48

Why debug print 48? I want 08.
In reading, in base 10, 48 gives 2048.
Thanks for reading.

Whynot BitsPerSample =qint8(header[34]);

An other french

See here a methode
It uses a data stream in little Endian.
I really don't understand the sens of chunkDataSize and if this makes trouble along the sample data sending.

An other french

Where i am now...

I put a timer to prevent the modem buffer from being saturated

           m_command = "AT+VTX;\r";
           output = m_command.toStdString().c_str();
           m_serial->write(output);
           m_serial->flush();

           timer = new QTimer(this);
           connect(timer, SIGNAL(timeout()), this, SLOT(sendWave()));
           timer->start(Latence);

The first bugg is the time it takes for the Hayes command to respond before sending a wave sample data to the modem.
I don't know how to wait the answer.
I think about a boolean to stop timer.
But I saw the example talking about waitForReadyRead.

I will not certain where i need to put this wait because of use connect(m_serial, &QSerialPort::readyRead, this, &MainWindow::readData);

An idea.
Thanks for reading.