//////////

//

//  File:       SoundConverter.c

//

//  Contains:   Sound format conversion sample code.

//

//  Written by: Bob Aron

//  Revised by: Tim Monroe

//

//  Copyright:  © 1999 by Apple Computer, Inc., all rights reserved.

//

//  Change History (most recent first):

//

//     <4>      03/20/00    rtm     made changes to get things running under CarbonLib

//     <3>      07/07/99    rtm     final tweaks

//     <2>      07/02/99    rtm     fixed problem causing crashes on Windows

//     <1>      07/01/99    rtm     first file from Bob Aron; conversion to personal coding style

//   

//  This is a simple application that demonstrates how to convert some uncompressed audio into any compression

//  format supported by QuickTime 4.0 and Sound Manager 3.4. There are two routines of interest in this file:

//  SndConv_ConvertSomeUncompressedAudio and SndConv_CreateSoundMovie.

//  

//  SndConv_ConvertSomeUncompressedAudio creates a 16-bit, mono, 44.1 kHz sine wave to use as source audio data

//  and then converts it to whatever format is desired. The output format is hard-coded at the beginning of the function

//  SndConv_DriveAudioConversion. SndConv_ConvertSomeUncompressedAudio places the converted data into a handle and then

//  calls SndConv_CreateSoundMovie to add the data to a newly-created movie.

//

//////////

#include "SoundConverter.h"

//////////

//

// SndConv_DriveAudioConversion

// Create some sound data and compress it into a file.

//

//////////

void SndConv_DriveAudioConversion (void)

{

    Handle                  mySourceHandle,                             

                            myDestHandle;

    Handle                  myDestCompParamsHandle = NULL;          

    SoundComponentData      mySourceInfo,                               

                            myDestInfo;

    unsigned long           mySourceTotalFrames,

                            myDestTotalFrames;

    short                   myResRefNum = -1;

    CompressionInfo         myDestCompressionInfo;

    Movie                   myMovie = NULL;

    FSSpec                  myFile;

    Boolean                 myIsSelected = false;

    Boolean                 myIsReplacing = false;  

    long                    myFlags = createMovieFileDeleteCurFile | createMovieFileDontCreateResFile;

    StringPtr               myPrompt = QTUtils_ConvertCToPascalString(kSaveSoundPrompt);

    StringPtr               myFileName = QTUtils_ConvertCToPascalString(kSaveSoundFileName);

    OSErr                   myErr = noErr;

    //////////

    //

    // allocate handles to hold the uncompressed (source) and compressed (destination) sound data

    //

    //////////

    mySourceHandle = NewHandleClear(0);

    myDestHandle = NewHandleClear(0);

    if ((mySourceHandle == NULL) || (myDestHandle == NULL))

        goto Bail;

    // create some uncompressed, 16-bit, mono, 44.1 kHz sound data; also, fill in the mySourceInfo structure

    // and return the total number of frames, which we'll use later

    myErr = SndConv_UncompressedSineWaveToHandle(mySourceHandle, &mySourceInfo, &mySourceTotalFrames);

    FailIf(myErr != noErr, Bail);

    //////////

    //

    // convert the source data

    //

    //////////

    // fill in the myDestInfo fields with the data format that you want to convert to

    myDestInfo.flags |= kNoRealtimeProcessing;      // perform in non-real time for best quality (this can also be set to zero)     

    myDestInfo.format = k16BitBigEndianFormat;      // data format

    myDestInfo.numChannels = 1;                     // number of channels (1 for mono, 2 for stereo)

    myDestInfo.sampleSize = 16;                     // sample size (may be left at 16 for all formats except k8BitOffsetBinaryFormat)

    myDestInfo.sampleRate = rate44khz;              // sample rate

    myDestInfo.sampleCount = 0;                     // leave set to 0

    myDestInfo.buffer = NULL;                       // leave set to NULL

    myDestInfo.reserved = 0;                        // leave set to 0

    // convert the source data

    myErr = SndConv_ConvertSomeUncompressedAudio(   mySourceHandle,

                                                    mySourceInfo,

                                                    mySourceTotalFrames,

                                                    myDestHandle,

                                                    myDestInfo, 

                                                    &myDestTotalFrames,

                                                    &myDestCompressionInfo,

                                                    &myDestCompParamsHandle);

    FailIf(myErr != noErr, Bail);

    //////////

    //

    // create a new movie to hold the converted sound data

    //

    //////////

    // elicit a location from the user

    QTFrame_PutFile(myPrompt, myFileName, &myFile, &myIsSelected, &myIsReplacing);

    if (!myIsSelected)

        goto Bail;

    if (myIsReplacing) {

        myErr = FSpDelete(&myFile);

        if (myErr != noErr)

            goto Bail;

    }

    myErr = CreateMovieFile(&myFile, FOUR_CHAR_CODE('TVOD'), smSystemScript, myFlags, &myResRefNum, &myMovie);

    FailIf(myErr != noErr, Bail);

    // put the newly-converted data into the movie

    myErr = SndConv_CreateSoundMovie(   myDestHandle,

                                        myResRefNum,

                                        myMovie,

                                        myDestInfo,

                                        &myDestCompParamsHandle, 

                                        myDestCompressionInfo,

                                        myDestTotalFrames);

    FailIf(myErr != noErr, Bail);   

Bail:

    free(myPrompt);

    free(myFileName);

    if (myMovie != 0)

        DisposeMovie(myMovie);

    if (myResRefNum != -1)

        CloseMovieFile(myResRefNum);

    if (myDestHandle != NULL)

        DisposeHandle(myDestHandle);

    if (mySourceHandle != NULL)

        DisposeHandle(mySourceHandle);

    if (myDestCompParamsHandle != NULL)

        DisposeHandle(myDestCompParamsHandle);

    return;

}

//////////

//

// SndConv_ConvertSomeUncompressedAudio

// Convert the specified sound data.

//

// This routine expects uncompressed, 16-bit mono data as source data.

//

//////////

OSErr SndConv_ConvertSomeUncompressedAudio (    Handle theSourceHandle,

                                                SoundComponentData theSourceInfo,

                                                unsigned long theSourceTotalFrames, 

                                                Handle theDestHandle,

                                                SoundComponentData theDestInfo,

                                                unsigned long *theDestFramesMoved, 

                                                CompressionInfo *theDestCompInfo,

                                                Handle *theDestCompParams)

{

    SoundConverter      myConverter;

    Handle              myDestCompParamsHandle = NULL;

    unsigned long       myNumFramesLeft,

                        mySourceFrames, 

                        myDestFrames,

                        mySourceBytes, 

                        myDestBytes,

                        myDataOffset = 0;

    Ptr                 myDestPtr = NULL;

    UInt16              hasOptionsDialog = 0;

    short               mySourceBytesPerFrame = 2;      // 16-bit mono uncompressed data is 2 bytes per frame

    OSErr               myErr = noErr;

    //////////

    //

    // open a sound converter

    //

    //////////

    myErr = SoundConverterOpen(&theSourceInfo, &theDestInfo, &myConverter);                     

    if (myErr != noErr)

        goto Bail;

    // see if the destination format has an options dialog and open if it does

    myErr = SoundConverterGetInfo(myConverter, siOptionsDialog, &hasOptionsDialog);

    if ((myErr == noErr) && hasOptionsDialog) { 

        myErr = SoundConverterSetInfo(myConverter, siOptionsDialog, NULL);

        FailIf(myErr != noErr, Bail);

    }

    myErr = SoundConverterSetInfo(myConverter, siCompressionChannels, &theDestInfo.numChannels);        

    // ignore this error, since some codecs don't use this selector (makes QDesign work)

    //////////

    //

    // get the sound converter-specific settings.

    //

    //////////

    // Not all sound converters have custom settings; in this case myDestCompParamsHandle will be unchanged.

    // we need to return these settings to the caller, as they are required by the decompressor to be able

    // to decompress the compressed audio. If this audio is stored in a QuickTime movie, these parameters

    // will be stored in a SoundDescriptionExtension of type siDecompressionParams.

    myErr = SoundConverterGetInfo(myConverter, siCompressionParams, &myDestCompParamsHandle);

    // if any compression params were passed back, send it to the sound converter now

    if (myErr == noErr) {

        HLockHi(myDestCompParamsHandle);

        myErr = SoundConverterSetInfo(myConverter, siCompressionParams, *myDestCompParamsHandle);           

        HUnlock(myDestCompParamsHandle);

        FailIf(myErr != noErr, Bail);

    } else {

        // no audio atom list to deal with, so set to NULL

        myDestCompParamsHandle = NULL;

    }

    // get sound converter buffer size info

    myErr = SoundConverterGetBufferSizes(myConverter, kMaxBufferSize, &mySourceFrames, &mySourceBytes, &myDestBytes);   

    FailIf(myErr != noErr, Bail);

    // create destination data buffer

    myDestPtr = NewPtrClear(myDestBytes);                                               

    myErr = MemError();

    FailIf(myErr != noErr, Bail);

    //////////

    //

    // convert the sound to the desired output format

    //

    //////////

    myErr = SoundConverterBeginConversion(myConverter);                                     

    FailIf(myErr != noErr, Bail);

    // get info about destination compression

    // We need to return this information to the caller as they are required

    // in order to put this compressed audio into a QuickTime movie. This information

    // will go into the Version 1 Sound Description Handle.

    myErr = SoundConverterGetInfo(myConverter, siCompressionFactor, theDestCompInfo);                   

    if (myErr != noErr) {

        myErr = GetCompressionInfo(fixedCompression, theDestInfo.format, theDestInfo.numChannels, theDestInfo.sampleSize, theDestCompInfo); 

        FailIf(myErr != noErr, Bail);

    }

    // myBytesPerFrame is not filled in by GetInfo, so we set it here

    theDestCompInfo->bytesPerFrame = theDestCompInfo->bytesPerPacket * theDestInfo.numChannels; 

    // initialize destination total frame count to zero

    *theDestFramesMoved = 0;                                                                                                                        

    myNumFramesLeft = theSourceTotalFrames;

    HLockHi(theSourceHandle);

    // loop through buffers of size mySourceFrames

    while (myNumFramesLeft > 0) {

        // if there are fewer frames remaining than our source buffer size,

        // we're near the end of our data, so get what's remaining

        if (myNumFramesLeft < mySourceFrames)                                                                                       

            mySourceFrames = myNumFramesLeft;                                           

        myErr = SoundConverterConvertBuffer(myConverter, *theSourceHandle + myDataOffset, mySourceFrames, myDestPtr, &myDestFrames, &myDestBytes);

        FailIf(myErr != noErr, Bail);

        // place the converted data into a handle

        myErr = PtrAndHand(myDestPtr, theDestHandle, myDestBytes);

        FailIf(myErr != noErr, Bail);

        // move offset to appropriate place in source data

        myDataOffset += mySourceFrames * mySourceBytesPerFrame;

        // keep track of total frames returned by converter

        *theDestFramesMoved += myDestFrames;

        myNumFramesLeft -= mySourceFrames;

    }

    // end the conversion, and see if we get back a few more bytes of data  

    myErr = SoundConverterEndConversion(myConverter, myDestPtr, &myDestFrames, &myDestBytes);       

    FailIf(myErr != noErr, Bail);

    HUnlock(theSourceHandle);

    // place any leftover converted data into the handle

    myErr = PtrAndHand(myDestPtr, theDestHandle, myDestBytes);

    FailIf(myErr != noErr, Bail);

    *theDestFramesMoved += myDestFrames;    

Bail:

    *theDestCompParams = myDestCompParamsHandle;

    if (myDestPtr != NULL)

        DisposePtr(myDestPtr);

    if (myConverter != NULL)

        SoundConverterClose(myConverter);

    return(myErr);

}

//////////

//

// SndConv_CreateSoundMovie

// Create a sound movie from the specified handle of audio data.

//

//////////

OSErr SndConv_CreateSoundMovie (    Handle theDestAudioData,

                                    short theMovieRefNum, 

                                    Movie theMovie,

                                    SoundComponentData theDestInfo, 

                                    Handle *theDestCompParams,

                                    CompressionInfo theDestCompInfo, 

                                    unsigned long theDestFrameCount)

{

    Track                       myTrack = NULL;

    Media                       myMedia = NULL;

    TimeScale                   myTimeScale;

    SoundDescriptionV1Handle    mySampleDesc = NULL;

    unsigned long               myLengthInSamples;

    OSErr                       myErr = noErr;

    //////////

    //              

    // create the movie track and media

    //              

    //////////

    myTrack = NewMovieTrack(theMovie, 0, 0, kFullVolume);                   

    myErr = GetMoviesError();

    FailIf(myErr != noErr, Bail);

    myTimeScale = (theDestInfo.sampleRate >> 16);

    // set new track to be a sound track

    myMedia = NewTrackMedia(myTrack, SoundMediaType, myTimeScale, NULL, 0);     

    myErr = GetMoviesError();   

    FailIf(myErr != noErr, Bail);

    // start a media editing session

    myErr = BeginMediaEdits(myMedia);                                       

    FailIf(myErr != noErr, Bail);

    //////////

    //              

    // create a sound sample description

    //              

    //////////

    // use the SoundDescription format 1 because it adds fields for data size information

    // and is required by AddSoundDescriptionExtension if an extension is required for the compression format

    mySampleDesc = (SoundDescriptionV1Handle)NewHandleClear(sizeof(SoundDescriptionV1));    

    myErr = MemError();

    FailIf(myErr != noErr, Bail);

    // fill in the fields of the sample description

    (*mySampleDesc)->desc.descSize          = sizeof(SoundDescriptionV1);

    (*mySampleDesc)->desc.dataFormat        = theDestInfo.format;                       

    (*mySampleDesc)->desc.resvd1            = 0;                                    

    (*mySampleDesc)->desc.resvd2            = 0;                                    

    (*mySampleDesc)->desc.dataRefIndex      = 1;                                    

    (*mySampleDesc)->desc.version           = 1;                                    

    (*mySampleDesc)->desc.revlevel          = 0;                                    

    (*mySampleDesc)->desc.vendor            = 0;                                    

    (*mySampleDesc)->desc.numChannels       = theDestInfo.numChannels;                  

    (*mySampleDesc)->desc.sampleSize        = theDestInfo.sampleSize;                    

    (*mySampleDesc)->desc.compressionID     = 0;                                    

    (*mySampleDesc)->desc.packetSize        = 0;                                    

    (*mySampleDesc)->desc.sampleRate        = theDestInfo.sampleRate;

    (*mySampleDesc)->samplesPerPacket       = theDestCompInfo.samplesPerPacket;

    (*mySampleDesc)->bytesPerPacket         = theDestCompInfo.bytesPerPacket;

    (*mySampleDesc)->bytesPerFrame          = theDestCompInfo.bytesPerFrame;

    (*mySampleDesc)->bytesPerSample         = theDestCompInfo.bytesPerSample;

    // not all compression formats have compression params, so we only need to add a

    // sound description extension for those that do 

    if (*theDestCompParams != NULL)

        AddSoundDescriptionExtension((SoundDescriptionHandle)mySampleDesc, *theDestCompParams, siDecompressionParams);

    //////////

    //              

    // add samples to the media

    //              

    //////////

    myLengthInSamples = theDestFrameCount * theDestCompInfo.samplesPerPacket;

    myErr = AddMediaSample( myMedia,

                            theDestAudioData,

                            0,

                            theDestFrameCount * theDestCompInfo.bytesPerFrame,

                            1, 

                            (SampleDescriptionHandle)mySampleDesc,

                            myLengthInSamples,

                            0,

                            NULL);

    FailIf(myErr != noErr, Bail);

    myErr = EndMediaEdits(myMedia);

    FailIf(myErr != noErr, Bail);

    //////////

    //              

    // add the media to the track

    //              

    //////////

    myErr = InsertMediaIntoTrack(myTrack, 0, 0, GetMediaDuration(myMedia), FixRatio(1, 1));

    FailIf(myErr != noErr, Bail);

    myErr = AddMovieResource(theMovie, theMovieRefNum, NULL, NULL);

    FailIf(myErr != noErr, Bail);

Bail:

    if (mySampleDesc != NULL)   

        DisposeHandle((Handle)mySampleDesc);

    return(myErr);

}

//////////

//

// SndConv_UncompressedSineWaveToHandle

// Create some 16-bit, monophonic, 44.1kHz data and stick it into a handle.

//

//////////

OSErr SndConv_UncompressedSineWaveToHandle (Handle theData, SoundComponentData *theCompInfo, unsigned long *theTotalFrames)

{

    long            myIndex, myByteCounter;

    double_t        mySinResult, myRate;

    long            myPlotMe;

    float           myPi = 3.14159;

    Byte            *myBufferPtr = NULL;

    Byte            *myStartOfBufferPtr = NULL;

    unsigned long   myBytesCount = 0;

    long            myFramesInBuffer = 10240;

    long            myHz = kConcertA,

                    mySeconds = 3;

    short           myBytesPerFrame;

    OSErr           myErr = noErr;

    *theTotalFrames = 0;

    theCompInfo->flags = 0;

    theCompInfo->format = k16BitBigEndianFormat;

    theCompInfo->numChannels = 1;

    theCompInfo->sampleSize = 16;

    theCompInfo->sampleRate = rate44khz;

    theCompInfo->sampleCount = mySeconds * (theCompInfo->sampleRate >> 16);

    theCompInfo->buffer = NULL;

    theCompInfo->reserved = 0;

    myBytesPerFrame = theCompInfo->sampleSize / 8;

    myBufferPtr = (Byte *)NewPtrClear(myFramesInBuffer * myBytesPerFrame);  

    FailWithAction(myBufferPtr == NULL, myErr = memFullErr, Bail);

    myStartOfBufferPtr = myBufferPtr;

    myRate = theCompInfo->sampleRate / 65536.0;

    //////////

    //          2 ¹ hz          

    //  (sin(i * ------)) * samplesize

    //           rate                                                                                           

    //////////

    for (myIndex = 0; myIndex < theCompInfo->sampleCount; myIndex++) {

        mySinResult = sin(myIndex * ((2 * myPi * myHz) / myRate));

        myPlotMe = mySinResult * ((1 << (theCompInfo->sampleSize - 1)) - 1);                                

        for (myByteCounter = 1; myByteCounter <= (theCompInfo->sampleSize / 8); myByteCounter++, myBytesCount++, myBufferPtr++) {

            *myBufferPtr = myPlotMe >> (theCompInfo->sampleSize - (myByteCounter * 8));

        }

        if (myBytesCount == myFramesInBuffer * myBytesPerFrame) {

            myErr = PtrAndHand(myStartOfBufferPtr, theData, myBytesCount);

            FailIf(myErr != noErr, Bail);

            *theTotalFrames += myBytesCount / myBytesPerFrame;                      

            myBytesCount = 0;                                                   // reset bytes count

            myBufferPtr = myStartOfBufferPtr;                                   // reset myBufferPtr

        }

    }

    myErr = PtrAndHand(myStartOfBufferPtr, theData, myBytesCount);

    FailIf(myErr != noErr, Bail);

    *theTotalFrames += myBytesCount / myBytesPerFrame;

Bail:

    if (myBufferPtr != NULL)

        DisposePtr((Ptr)myBufferPtr);

    return(myErr);

}