writing mp3 headers

i want write QAudioBuffer to mp3
how to create headers?
give me any man or doc, something

i look example audiodecoder , but "wav" not "mp3"

Code:

---

bool mpegFileWriter::writeHeader(const QAudioFormat &format)
{
    // check if format is supported
    if (format.byteOrder() == QAudioFormat::BigEndian || format.sampleType() != QAudioFormat::SignedInt)
        return false;
 
    CombinedHeader header;
    memset(&header, 0, HeaderLength);
 
#ifndef Q_LITTLE_ENDIAN
    // only implemented for LITTLE ENDIAN
    return false;
#else
    // RIFF header
    memcpy(header.riff.descriptor.id, "RIFF", 4);
    header.riff.descriptor.size = 0; // this will be updated with correct duration:
                                     // m_dataLength + HeaderLength - 8
    // mpeg header
    memcpy(header.riff.type, "mpeg", 4);
    memcpy(header.mpeg.descriptor.id, "fmt ", 4);
    header.mpeg.descriptor.size = quint32(16);
    header.mpeg.audioFormat = quint16(1);
    header.mpeg.numChannels = quint16(format.channelCount());
    header.mpeg.sampleRate = quint32(format.sampleRate());
    header.mpeg.byteRate = quint32(format.sampleRate() * format.channelCount() * format.sampleSize() / 8);
    header.mpeg.blockAlign = quint16(format.channelCount() * format.sampleSize() / 8);
    header.mpeg.bitsPerSample = quint16(format.sampleSize());
 
    // DATA header
    memcpy(header.data.descriptor.id,"data", 4);
    header.data.descriptor.size = 0; // this will be updated with correct data length: m_dataLength
 
    return (file.write(reinterpret_cast<const char *>(&header), HeaderLength) == HeaderLength);
#endif
}

---

i replace wave to mpeg)))
mpg123 say header invalid