Method encodeAiffFile

AudioFile.h:1031–1129

//=============================================================
template <class T>
bool AudioFile<T>::encodeAiffFile (std::vector<uint8_t>& fileData)
{    
    int32_t numBytesPerSample = bitDepth / 8;
    int32_t numBytesPerFrame = numBytesPerSample * getNumChannels();
    int32_t totalNumAudioSampleBytes = getNumSamplesPerChannel() * numBytesPerFrame;
    int32_t soundDataChunkSize = totalNumAudioSampleBytes + 8;
    int32_t iXMLChunkSize = static_cast<int32_t> (iXMLChunk.size());
    
    // -----------------------------------------------------------
    // HEADER CHUNK
    addStringToFileData (fileData, "FORM");
    
    // The file size in bytes is the header chunk size (4, not counting FORM and AIFF) + the COMM
    // chunk size (26) + the metadata part of the SSND chunk plus the actual data chunk size
    int32_t fileSizeInBytes = 4 + 26 + 16 + totalNumAudioSampleBytes;
    if (iXMLChunkSize > 0)
    {
        fileSizeInBytes += (8 + iXMLChunkSize);
    }

    addInt32ToFileData (fileData, fileSizeInBytes, Endianness::BigEndian);
    
    addStringToFileData (fileData, "AIFF");
    
    // -----------------------------------------------------------
    // COMM CHUNK
    addStringToFileData (fileData, "COMM");
    addInt32ToFileData (fileData, 18, Endianness::BigEndian); // commChunkSize
    addInt16ToFileData (fileData, getNumChannels(), Endianness::BigEndian); // num channels
    addInt32ToFileData (fileData, getNumSamplesPerChannel(), Endianness::BigEndian); // num samples per channel
    addInt16ToFileData (fileData, bitDepth, Endianness::BigEndian); // bit depth
    addSampleRateToAiffData (fileData, sampleRate);
    
    // -----------------------------------------------------------
    // SSND CHUNK
    addStringToFileData (fileData, "SSND");
    addInt32ToFileData (fileData, soundDataChunkSize, Endianness::BigEndian);
    addInt32ToFileData (fileData, 0, Endianness::BigEndian); // offset
    addInt32ToFileData (fileData, 0, Endianness::BigEndian); // block size
    
    for (int i = 0; i < getNumSamplesPerChannel(); i++)
    {
        for (int channel = 0; channel < getNumChannels(); channel++)
        {
            if (bitDepth == 8)
            {
                uint8_t byte = static_cast<uint8_t> (AudioSampleConverter<T>::sampleToSignedByte (samples[channel][i]));
                fileData.push_back (byte);
            }
            else if (bitDepth == 16)
            {
                int16_t sampleAsInt = AudioSampleConverter<T>::sampleToSixteenBitInt (samples[channel][i]);
                addInt16ToFileData (fileData, sampleAsInt, Endianness::BigEndian);
            }
            else if (bitDepth == 24)
            {
                int32_t sampleAsIntAgain = AudioSampleConverter<T>::sampleToTwentyFourBitInt (samples[channel][i]);