Method encodeWaveFile

AudioFile.h:904–1027

//=============================================================
template <class T>
bool AudioFile<T>::encodeWaveFile (std::vector<uint8_t>& fileData)
{    
    int32_t dataChunkSize = getNumSamplesPerChannel() * (getNumChannels() * bitDepth / 8);
    int16_t audioFormat = bitDepth == 32 && std::is_floating_point_v<T> ? WavAudioFormat::IEEEFloat : WavAudioFormat::PCM;
    int32_t formatChunkSize = audioFormat == WavAudioFormat::PCM ? 16 : 18;
    int32_t iXMLChunkSize = static_cast<int32_t> (iXMLChunk.size());
    
    // -----------------------------------------------------------
    // HEADER CHUNK
    addStringToFileData (fileData, "RIFF");
    
    // The file size in bytes is the header chunk size (4, not counting RIFF and WAVE) + the format
    // chunk size (24) + the metadata part of the data chunk plus the actual data chunk size
    int32_t fileSizeInBytes = 4 + formatChunkSize + 8 + 8 + dataChunkSize;
    if (iXMLChunkSize > 0)
    {
        fileSizeInBytes += (8 + iXMLChunkSize);
    }

    addInt32ToFileData (fileData, fileSizeInBytes);
    
    addStringToFileData (fileData, "WAVE");
    
    // -----------------------------------------------------------
    // FORMAT CHUNK
    addStringToFileData (fileData, "fmt ");
    addInt32ToFileData (fileData, formatChunkSize); // format chunk size (16 for PCM)
    addInt16ToFileData (fileData, audioFormat); // audio format
    addInt16ToFileData (fileData, static_cast<int16_t> (getNumChannels())); // num channels
    addInt32ToFileData (fileData, static_cast<int32_t> (sampleRate)); // sample rate
    
    int32_t numBytesPerSecond = static_cast<int32_t> ((getNumChannels() * sampleRate * bitDepth) / 8);
    addInt32ToFileData (fileData, numBytesPerSecond);
    
    int16_t numBytesPerBlock = getNumChannels() * (bitDepth / 8);
    addInt16ToFileData (fileData, numBytesPerBlock);
    
    addInt16ToFileData (fileData, static_cast<int16_t> (bitDepth));
    
    if (audioFormat == WavAudioFormat::IEEEFloat)
        addInt16ToFileData (fileData, 0); // extension size
    
    // -----------------------------------------------------------
    // DATA CHUNK
    addStringToFileData (fileData, "data");
    addInt32ToFileData (fileData, dataChunkSize);
    
    for (int i = 0; i < getNumSamplesPerChannel(); i++)
    {
        for (int channel = 0; channel < getNumChannels(); channel++)
        {
            if (bitDepth == 8)
            {
                uint8_t byte = AudioSampleConverter<T>::sampleToUnsignedByte (samples[channel][i]);
                fileData.push_back (byte);
            }
            else if (bitDepth == 16)
            {