SoundFileCA.cpp

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//
//  SoundFileCA.cpp -- sound file class using CoreAudio
//
//  See the copyright notice and acknowledgment of authors in the file COPYRIGHT
//

#include "SoundFileCA.h"

// JUCE types

typedef signed char                 int8;
typedef unsigned char               uint8;
typedef signed short                int16;
typedef unsigned short              uint16;
typedef signed int                  int32;
typedef unsigned int                uint32;

#define CONVERT_16_BIT(unsV, sinV, bigE)                \
    if (bigE)                                           \
        unsV = ((unsV << 8) | (unsV >> 8));             \
    sinV = unsV & 0x7fff;                               \
    if (unsV & 0x8000)                                  \
        sinV += 0x8000

#define CONVERT_24_BIT(res, ptr, bigE)                  \
    if (bigE)                                           \
        res = (((int) ptr[2]) << 16)                    \
            | (((uint32) (uint8) ptr[1]) << 8)          \
            | ((uint32) (uint8) ptr[0]);                \
    else                                                \
        res = (((int) ptr[0]) << 16)                    \
            | (((uint32) (uint8) ptr[1]) << 8)          \
            | ((uint32) (uint8) ptr[2])

using namespace csl;

//
// CASoundFile implementation
//

CASoundFile::CASoundFile(string tpath, int tstart, int tstop) 
        : Abst_SoundFile(tpath, tstart, tstop),
          mURL(0) {
                    
    if (tpath.size() > 0)               // set up the file URL
        mURL = CFURLCreateWithFileSystemPath (NULL, 
                (CFStringCreateWithCString (NULL, tpath.c_str(), kCFStringEncodingMacRoman)), 
            kCFURLPOSIXPathStyle, false);
}

CASoundFile::CASoundFile(string folder, string tpath, int start, int stop)
        : Abst_SoundFile(folder, tpath, start, stop),
          mURL(0) { }

CASoundFile::CASoundFile(CASoundFile & otherSndFile)
        : Abst_SoundFile(otherSndFile),
          mURL(0) { }

CASoundFile::CASoundFile(CFURLRef path)
        : Abst_SoundFile(""),
          mURL(path) {
    char theName[CSL_NAME_LEN];
    CFStringGetCString (CFURLGetString(path), theName, CSL_NAME_LEN, kCFStringEncodingMacRoman);
    mPath = string(theName);
}

CASoundFile::~CASoundFile() { /* no-op */ }

// Accessors

SoundFileFormat CASoundFile::format() {
    return kSoundFileFormatAIFF;            // ??
}

// set up the receiver's variables based on the file

void CASoundFile::initFromSndfile() {
    mIsValid = (mFrameRate != 0.0);
    if ( ! mIsValid) {
//      logMsg(kLogError, "Cannot open sound file \"%s\"", mPath.c_str());
        return;
    }
    if (mStart > 0)
        seekTo(mStart, kPositionStart);
    else
        mStart = 0;
    if (mStop < 0)
        mStop = mNumFrames;
}

// CASoundFile::openForRead()

void CASoundFile::openForRead() throw (CException) {
    OSStatus err = noErr;   
    mMode = kSoundFileRead;
    UInt32 propertySize, fileSize;

    if (mURL == 0)                              // create URL is opened with a file name
        mURL = CFURLCreateFromFileSystemRepresentation(NULL, 
                                (const UInt8*) mPath.c_str(), mPath.size(), false);
                                                // open audio file
    AudioFileOpenURL(mURL, 0x01, kAudioFileCAFType, &mSoundID);
    
    err = AudioFileGetPropertyInfo(mSoundID,    // AudioFileID inAudioFile,
                              kAudioFilePropertyAudioDataPacketCount, // AudioFilePropertyID inPropertyID,
                              &propertySize,    // UInt32 *outDataSize,
                              NULL);            // UInt32 *isWritable
    if (err) { 
        printf("\nCASoundFile::openForRead: AudioFileGetPropertyInfo Error = %x\nFile: \"%s\"\n\n", 
                (int) err, mPath.c_str()); 
        return;
    }
    err = AudioFileGetProperty(mSoundID, kAudioFilePropertyAudioDataPacketCount, &propertySize, &fileSize);
    if (err) { 
        printf("\nCASoundFile::openForRead: AudioFileGetProperty Error = %x\nFile: \"%s\"\n\n", 
                (int) err, mPath.c_str()); 
        return;
    }
    AudioStreamBasicDescription fileFormat;
    propertySize = sizeof(AudioStreamBasicDescription);
    err = AudioFileGetProperty(mSoundID, kAudioFilePropertyDataFormat, &propertySize, &fileFormat);
    if (err) { 
        printf("\nCASoundFile::openForRead: AudioFileGetProperty2 Error = %x\nFile: \"%s\"\n\n", 
                (int) err, mPath.c_str()); 
        return;
    }
//  logMsg("Format = 0x%x", fileFormat.mFormatID);
//  logMsg("Flags = 0x%x", fileFormat.mFormatFlags);
    mFrameRate = (unsigned) fileFormat.mSampleRate;
    mNumChannels = (unsigned) fileFormat.mChannelsPerFrame;
    mNumFrames = (unsigned) fileSize;
    mBigEndian = fileFormat.mFormatFlags & kAudioFormatFlagIsBigEndian;
    mBytesPerSample = (unsigned) fileFormat.mBitsPerChannel / 8;
    if (mBytesPerSample == 0) {
        logMsg(kLogError, "Sound file \"%s\" has mBitsPerChannel = 0\n", mPath.c_str());
        mBytesPerSample = 2;
    }
    
    this->initFromSndfile();
    if ( ! mIsValid) {
        logMsg(kLogError, "Cannot open sound file \"%s\"\n", mPath.c_str());
        return;
    }
    if (mNumFrames <= CGestalt::maxSndFileFrames()) {       // read file if size < global max
//      logMsg("Open/read sound file \"%s\" %d frames %g sec %d channels", 
//              mPath.c_str(), duration(), durationInSecs(), channels());

        this->readBufferFromFile(mNumFrames);               // read entire file

        mCurrentFrame = mStart;
    }
}

void CASoundFile::openForWrite(SoundFileFormat tformat, unsigned tchannels, 
        unsigned rate, unsigned bitDepth) throw (CException) {
    logMsg("Error: CASoundFile::openForWrite unsupported");         
    // no-op
}

void CASoundFile::close() {
    freeBuffer();
}

// read some samples from the file into the temp buffer

void CASoundFile::readBufferFromFile(unsigned numFrames) {
    OSStatus err = noErr;   
    SampleBuffer sampleBufferPtr;
    unsigned currentFrame = mCurrentFrame;
    unsigned myChannels = mNumChannels;
    UInt32 numBytes, fileSize;

    this->checkBuffer(numFrames);           // check my buffer, allocate if necessary
                                            // if we are at the end of the file and not looping
    if ((currentFrame >= (unsigned) mStop) && !mIsLooping) {
        for (unsigned i = 0; i < mNumChannels; i++) {
            sampleBufferPtr = mWavetable.monoBuffer(i);
            memset(sampleBufferPtr, 0, numFrames * sizeof(sample));
        }
        return;
    }
    fileSize = numFrames;
    numBytes = numFrames * myChannels * mBytesPerSample;
    unsigned char * soundBuffer = (unsigned char *) malloc(numBytes);   // create a temp buffer to read into
    
//      OSStatus AudioFileReadPackets (
//         AudioFileID                  inAudioFile,
//         Boolean                      inUseCache,
//         UInt32                       *outNumBytes,
//         AudioStreamPacketDescription *outPacketDescriptions,
//         SInt64                       inStartingPacket,
//         UInt32                       *ioNumPackets,
//         void                         *outBuffer
//      );
                                                            // read the samples
    err = AudioFileReadPackets(mSoundID, false, &numBytes, NULL, currentFrame, &fileSize, soundBuffer);
    if (err) { 
        printf("\nCASoundFile::openForRead: AudioFileReadPackets Error = %x\nFile: \"%s\"\n\n", 
                (int) err, mPath.c_str()); 
        return;
    }
    if (fileSize != numFrames) {
        printf("\nCASoundFile::openForRead: read too few samples, %d instead of %d\n", 
                (int) fileSize, numFrames); 
    }
                                                            // now process the short buffer just read in
    unsigned short * tBfr = (unsigned short *) soundBuffer;
    unsigned char * cBfr = soundBuffer;
    unsigned short uVal;
    int iVal;
    short sVal;
//  printf("\nCASoundFile::readBufferFromFile: %d ch %d bps\n\n", myChannels, mBytesPerSample); 
    if (myChannels == 1) {                                  // copy mono data
        sample * sampPtr = mWavetable.buffer(0];            // this code is lifted from JUCE (AiffAudioFormat.cpp)
        if (mBytesPerSample == 2) {                         // 16-bit samples
            sample scale = 1.0f / 32867.0f;
            for (unsigned j = 0; j < fileSize; j++) {       // copy/scale sample data
                uVal = *tBfr++;
                CONVERT_16_BIT(uVal, sVal, mBigEndian);
                *sampPtr++ = (sample) sVal * scale;
            }
        } else if (mBytesPerSample == 3) {                  // 24-bit samples
            sample scale = (sample) (1.0 / 8388608.0);
            for (unsigned j = 0; j < fileSize; j++) {       // copy/scale sample data
                CONVERT_24_BIT(iVal, cBfr, mBigEndian);
                *sampPtr++ = (sample) iVal * scale;
                cBfr += 3;
            }
        }
    } else if (myChannels == 2) {                           // multichannel files: copy/scale, then deinterleave
        sample * sampBuf = (sample *) malloc(numFrames * myChannels * sizeof(sample));
        sample * sampPtr = sampBuf;
        if (mBytesPerSample == 2) {                         // 16-bit samples
            sample scale = 1.0f / 32867.0f;                 // copy/scale sample data
            for (unsigned j = 0; j < (fileSize * myChannels); j++) {
                uVal = *tBfr++;
                CONVERT_16_BIT(uVal, sVal, mBigEndian);
                *sampPtr++ = (sample) sVal * scale;
            }
        } else if (mBytesPerSample == 3) {                  // 24-bit samples
            sample scale = (sample) (1.0 / 8388608.0);
            for (unsigned j = 0; j < (fileSize * myChannels); j++) {    // copy/scale sample data
                CONVERT_24_BIT(iVal, cBfr, mBigEndian);
                *sampPtr++ = (sample) iVal * scale;
                cBfr += 3;
            }
        }
        Interleaver interl;                                 // multichannel deinterleaver
        interl.deinterleave(mWavetable, sampBuf, fileSize, myChannels);
        free(sampBuf);
    }                                                       // else? ToDo: handle other # channels?
    free(soundBuffer);                                      // free the temp buffer
    currentFrame += numFrames;

                                                            // if we are past the end of the file...
    if (currentFrame > (unsigned) mStop) {
        unsigned numFramesRemaining = currentFrame - mStop;
        unsigned numFramesRead = numFrames - numFramesRemaining;
//      SampleBuffer tempBufferPtr = sampleBufferPtr + (numFramesRead * myChannels);
        if (mIsLooping) {                                   // loop back to start of file
            while (numFramesRead < numFrames) {
                currentFrame = seekTo(0, kPositionStart);
                        // ToDo: handle loop here           // call JUCE read function
//              mAFReader->read(mWavetable.mBuffers, myChannels, mCurrentFrame, numFrames, false);
                currentFrame += numFramesRead;
            }
        } else {
            unsigned bytesToClear = numFramesRemaining * sizeof(sample);
            for (unsigned i = 0; i < mNumChannels; i++) {
                sampleBufferPtr = mWavetable.monoBuffer(i);
                memset(sampleBufferPtr, 0, bytesToClear);
            }
        }
    }
    return;
}

// Seek

unsigned CASoundFile::seekTo(int position, SeekPosition whence) throw(CException) {
    if (this->isCached())
        return mCurrentFrame;
    switch (whence) {
        case kPositionStart: 
            mCurrentFrame = position; 
            break;
        case kPositionCurrent: 
            mCurrentFrame = mCurrentFrame - position; 
            break;
        case kPositionEnd: 
            mCurrentFrame = duration() - position; 
            break;
        default: 
            mCurrentFrame = SEEK_CUR;
            logMsg("Error: Invalid position seek flag. Used kPositionCurrent.");            
            break;
    }
    return mCurrentFrame;
}

// write a CSL buffer to the interleaved output file

void CASoundFile::writeBuffer(Buffer &inputBuffer) throw(CException) {
    logMsg("Error: CASoundFile::writeBuffer unsupported");          
    // no-op
}

// log snd file props

void CASoundFile::dump() {
    const char * nam = path().c_str();
    if (strlen(nam) > 50)
        logMsg("SndFile \"%s\"\n\t\t%d Hz, %d ch, %5.3f sec %s", 
                nam, frameRate(), channels(), durationInSecs(),
                (mBigEndian ? "BigE" : "LittleE"));
    else
        logMsg("SndFile \"%s\" - %d Hz, %d ch, %5.3f sec %s", 
                nam, frameRate(), channels(), durationInSecs(),
                (mBigEndian ? "BigE" : "LittleE"));
}