Method decodeWaveFile

AudioFile.h:549–704

//=============================================================
template <class T>
bool AudioFile<T>::decodeWaveFile (const std::vector<uint8_t>& fileData)
{
    // -----------------------------------------------------------
    // HEADER CHUNK
    std::string headerChunkID (fileData.begin(), fileData.begin() + 4);
    //int32_t fileSizeInBytes = fourBytesToInt (fileData, 4) + 8;
    std::string format (fileData.begin() + 8, fileData.begin() + 12);
    
    // -----------------------------------------------------------
    // try and find the start points of key chunks
    int indexOfDataChunk = getIndexOfChunk (fileData, "data", 12);
    int indexOfFormatChunk = getIndexOfChunk (fileData, "fmt ", 12);
    int indexOfXMLChunk = getIndexOfChunk (fileData, "iXML", 12);
    
    // if we can't find the data or format chunks, or the IDs/formats don't seem to be as expected
    // then it is unlikely we'll able to read this file, so abort
    if (indexOfDataChunk == -1 || indexOfFormatChunk == -1 || headerChunkID != "RIFF" || format != "WAVE")
    {
        reportError ("ERROR: this doesn't seem to be a valid .WAV file");
        return false;
    }
    
    // -----------------------------------------------------------
    // FORMAT CHUNK
    int f = indexOfFormatChunk;
    std::string formatChunkID (fileData.begin() + f, fileData.begin() + f + 4);
    //int32_t formatChunkSize = fourBytesToInt (fileData, f + 4);
    uint16_t audioFormat = twoBytesToInt (fileData, f + 8);
    uint16_t numChannels = twoBytesToInt (fileData, f + 10);
    sampleRate = static_cast<uint32_t> (fourBytesToInt (fileData, f + 12));
    uint32_t numBytesPerSecond = fourBytesToInt (fileData, f + 16);
    uint16_t numBytesPerBlock = twoBytesToInt (fileData, f + 20);
    bitDepth = static_cast<int> (twoBytesToInt (fileData, f + 22));
    
    if (bitDepth > sizeof (T) * 8)
    {
        std::string message = "ERROR: you are trying to read a ";
        message += std::to_string (bitDepth);
        message += "-bit file using a ";
        message += std::to_string (sizeof (T) * 8);
        message += "-bit sample type";
        reportError (message);
        return false;
    }
    
    uint16_t numBytesPerSample = static_cast<uint16_t> (bitDepth) / 8;
    
    // check that the audio format is PCM or Float or extensible
    if (audioFormat != WavAudioFormat::PCM && audioFormat != WavAudioFormat::IEEEFloat && audioFormat != WavAudioFormat::Extensible)
    {
        reportError ("ERROR: this .WAV file is encoded in a format that this library does not support at present");
        return false;
    }
    
    // check the number of channels is mono or stereo
    if (numChannels < 1 || numChannels > 128)
    {
        reportError ("ERROR: this WAV file seems to be an invalid number of channels (or corrupted?)");