/*---------------------------------------------------------------------*
        Copyright (C) 1998 Nintendo.
        
        $RCSfile: vadpcm_enc.c,v $
        $Revision: 1.1.1.1 $
        $Date: 2002/05/02 03:29:18 $
 *---------------------------------------------------------------------*/
#include "vadpcm.h"

static char usage[] = "[-t -l min_loop_length] -c codebook aifcfile compressedfile";

#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif

main(int argc, char *argv[])
{
    extern char	*optarg;
    extern int	optind;	
    int 	c;

    char
        *progname = argv[0];

    short
        nloops = 0,
        numMarkers,
        *inBuffer,
        ts;
    
    int
        minLoopLength = MINLOOPLENGTH,
        ***coefTable = NULL,
        *state,
        order,
        npredictors,
        done = 0,
        truncate = 0,
        num,
        tableSize,
        nsam,
        left,
        newEnd,
        nRepeats,
        i,
        j,
        k;

    long
        nFrames,
        offset,
        cChunkPos,
        currentPos,
        soundPointer = 0,
        startPointer = 0,
        startSoundPointer = 0,
        cType,
        nBytes = 0;
    
    unsigned long
        loopEnd;

    char
        *compName = "VADPCM ~4-1",
        *appCodeName = "VADPCMCODES",
        *appLoopName = "VADPCMLOOPS";
    
    unsigned char
        strnLen;
    
    Chunk
        AppChunk,
        FormChunk;
    
    ChunkHeader
        CSndChunk,
        Header;
    
    CommonChunk
        CommChunk = {0};
    
    SoundDataChunk
        SndDChunk = {0};

    InstrumentChunk
        InstChunk = {0};

    Loop
        *loops = 0;

    ALADPCMloop
        *aloops;
    
    Marker
        *markers;

    CodeChunk
        cChunk; 
    
    char
        filename[1024];
    
    FILE
        *fhandle,
        *ifile,
        *ofile;

    if (argc<2){
        fprintf(stderr,"%s %s\n",progname,usage);
        exit(1);
    }
    
    while ((c=getopt(argc,argv,"tc:l:"))!=-1){
        switch (c) {
            case 'c':
                if (sscanf(optarg,"%s",filename)==1){
                    if ((fhandle = fopen(filename, "r"))==NULL){
                        fprintf(stderr,"Codebook file %s could not be opened\n",filename);
                        exit(1);
                    }
                    if (readcodebook(fhandle, &coefTable, &order, &npredictors) != 0){
                        fprintf(stderr,"Error reading codebook\n");
                        exit(1);
                    }
                }
                break;
            case 't':
                truncate = 1;
                break;
            case 'l':
                sscanf(optarg,"%d",&minLoopLength);
                break;
            default:
                break;
        }
    }
    
    if (coefTable==NULL){
        fprintf(stderr,"You should specify a coefficient codebook with the [-c] option\n");
        exit(1);
    }
    argv += optind-1;
    
    if ((ifile = fopen(argv[1], "r")) == NULL){
        fprintf(stderr,"%s: input file [%s] could not be opened.\n",progname, argv[1]);
        exit(1);
    }

    if ((ofile = fopen(argv[2], "w")) == NULL){
        fprintf(stderr,"%s: output file [%s] could not be opened.\n",progname, argv[2]);
        exit(1);
    }

    state = (int *) malloc(FRAMESIZE*sizeof(int));
    for (i=0; i<FRAMESIZE; i++)
        state[i] = 0;
    inBuffer = (short *) malloc(FRAMESIZE*sizeof(short));

    /*
     * Read the FORM chunk and check for AIFC file
     */
    fread(&FormChunk, sizeof(Chunk), 1, ifile);
    if ((FormChunk.ckID != IFF_ID_FORM) ||  (FormChunk.formType != IFF_ID_AIFC)) {
        if(FormChunk.formType != IFF_ID_AIFF) {
            fprintf(stderr,"%s: [%s] is not an AIFF-C File\n",progname,argv[1]);
            exit(1);
        }
    }

    /*
     * Scan AIFC file for chunks. Read in the COMMON chunk.
     * Set-up a pointer to the sound data chunk. Read loop points
     * from the INST chunk.
     */
    while (!done) {

        num = fread(&Header, sizeof(ChunkHeader), 1, ifile);
        if (num < 1) {
            done = 1;
            break;
        }
        /*
         * Add the pad byte if necessary to the count
         */
        Header.ckSize  = ++Header.ckSize & ~1;

        switch (Header.ckID) {
            case (IFF_ID_COMM):

                offset = ftell(ifile);
                num = fread (&CommChunk, sizeof(CommonChunk), 1, ifile);
                if (num < 1) {
                    fprintf(stderr,"%s: error parsing file [%s]\n", progname, argv[1]);
                    done = 1;
                }                
                
                /*
                 * Check for a valid file format
                 */
                if(FormChunk.formType != IFF_ID_AIFF) {
                    cType = (CommChunk.compressionTypeH<<16) + CommChunk.compressionTypeL;
                    if (cType != 'NONE'){
                        fprintf(stderr,"%s: file [%s] contains compressed data.\n",
                                progname, argv[1]);
                        exit(1);
		    }
                }
                if (CommChunk.numChannels != 1){
                    fprintf(stderr,"%s: file [%s] contains %ld channels, only 1 channel supported.\n",
                            progname, argv[1], CommChunk.numChannels);
                    exit(1);
                }
                if (CommChunk.sampleSize != 16){
                    fprintf(stderr,"%s: file [%s] contains %ld bit samples, only 16 bit samples supported.\n",
                            progname, argv[1], CommChunk.sampleSize);
                    exit(1);
                }
    
                fseek(ifile, offset + Header.ckSize, SEEK_SET);
                
                break;
            
            case (IFF_ID_SSND):
                offset = ftell(ifile);
                fread(&SndDChunk, sizeof (SndDChunk), 1, ifile);
                assert(SndDChunk.offset == 0);
                assert(SndDChunk.blockSize == 0);
                
                soundPointer = ftell(ifile);
                fseek(ifile, offset + Header.ckSize, SEEK_SET);
                break;

            case (IFF_ID_MARK):
                offset = ftell(ifile);
                fread(&numMarkers, sizeof(short), 1, ifile);
                markers = (Marker *) malloc(sizeof(Marker)*numMarkers);
                for (i=0; i<numMarkers; i++){
                    fread(&markers[i], sizeof(Marker), 1, ifile);
                    fread(&strnLen, 1, 1, ifile);
                    if (strnLen & 1)
                        fseek(ifile, strnLen, SEEK_CUR);
                    else
                        fseek(ifile, strnLen+1, SEEK_CUR);
                }

                fseek(ifile, offset + Header.ckSize, SEEK_SET);
                break;
                
            case (IFF_ID_INST):
                offset = ftell(ifile);

                fread(&InstChunk, sizeof(InstrumentChunk), 1, ifile);
                
                aloops = (ALADPCMloop *) malloc(2*sizeof(ALADPCMloop));
                loops = (Loop *) malloc(2*sizeof(Loop));
                if (InstChunk.sustainLoop.playMode == ForwardLooping){
                    loops[nloops].beginLoop = InstChunk.sustainLoop.beginLoop;
                    loops[nloops].endLoop = InstChunk.sustainLoop.endLoop;
                    nloops++;
                }
                if (InstChunk.releaseLoop.playMode == ForwardLooping){
                    loops[nloops].beginLoop = InstChunk.releaseLoop.beginLoop;
                    loops[nloops].endLoop = InstChunk.releaseLoop.endLoop;
                    nloops++;
                }
                
                fseek(ifile, offset + Header.ckSize, SEEK_SET);
                break;
                
            default:                
                /* skip chunks we don't know about */
                fseek(ifile, Header.ckSize, SEEK_CUR);                
                break;
        }        
    }
    /*
     * Set-up the output data file
     */

    FormChunk.formType = IFF_ID_AIFC;
    fwrite(&FormChunk, sizeof(Chunk), 1, ofile);

    Header.ckID = 'COMM';
    Header.ckSize = sizeof(CommChunk) + 12;
    fwrite(&Header, sizeof(Header), 1, ofile);
    CommChunk.compressionTypeH = 'VA';
    CommChunk.compressionTypeL = 'PC';

    cChunkPos = ftell(ofile);
    fwrite(&CommChunk, sizeof(CommonChunk), 1, ofile);
    strnLen = 11;
    fwrite(&strnLen, 1, 1, ofile);
    fwrite(compName, strnLen, 1, ofile);
    
    /*
     * Also write the instrument chunk to output file
     */
    Header.ckID = 'INST';
    Header.ckSize = 20;
    fwrite(&Header, sizeof(Header), 1, ofile);
    fwrite(&InstChunk, sizeof(InstrumentChunk), 1, ofile);

    /*
     * Write the CODE application specific data chunk
     */
    tableSize = sizeof(short)*order*npredictors*VECTORSIZE;
    strnLen = 11;
    AppChunk.ckID = 'APPL';
    AppChunk.ckSize = tableSize + sizeof(long) + strnLen + 1 + sizeof(CodeChunk);
    AppChunk.formType = 'stoc';

    fwrite(&AppChunk, sizeof(AppChunk), 1, ofile);
    cChunk.version = VERSION;
    cChunk.order = (short) order;
    cChunk.nEntries = (short) npredictors;
    fwrite(&strnLen, 1, 1, ofile);
    fwrite(appCodeName, strnLen, 1, ofile);
    fwrite(&cChunk, sizeof(CodeChunk), 1, ofile);
    for (i=0; i<npredictors; i++)
        for (j=0; j<order; j++)
            for (k=0; k<VECTORSIZE; k++){
                ts = coefTable[i][k][j];
                fwrite(&ts, sizeof(short), 1, ofile);
            }
    
    /*
     * Set up the input and output files to point to their
     * Sound data chunks and encode, recording the state for
     * each loop point
     */

    /*
     * The start points of the loops are in
     * sequential order.
     */
    currentPos = 0;
    if (soundPointer>0)
        fseek(ifile, soundPointer, SEEK_SET); 
    else {
        fprintf(stderr,"%s: Error in sound chunk",progname);
        exit(1);
    }

    /*
     * Write a space for the Sound data chunk - fill in data at end
     */
    soundPointer = ftell(ofile);
    fwrite(&CSndChunk, sizeof(ChunkHeader), 1, ofile);
    fwrite(&SndDChunk, sizeof(SoundDataChunk), 1, ofile);

    startSoundPointer = ftell(ifile);
    for (i=0; i<nloops; i++){
        if (lookupMarker(&aloops[i].start, loops[i].beginLoop, markers, numMarkers))
            fprintf(stderr, "%s: Start loop marker not found\n",progname);
        else 
            if (lookupMarker(&aloops[i].end, loops[i].endLoop, markers, numMarkers))
                fprintf(stderr, "%s: End loop marker not found\n",progname);
            else {
                /*
                 * Start pointer assuming 16 bit samples
                 */
                startPointer = startSoundPointer + aloops[i].start*sizeof(short);
                /*
                 * Check the length of the loop
                 */
                nRepeats = 0;
                newEnd = aloops[i].end;
                while ((newEnd - aloops[i].start) < minLoopLength){
                    nRepeats++;
                    newEnd += aloops[i].end - aloops[i].start;
                }
                
                while (currentPos <= aloops[i].start){
                    if (fread(inBuffer, sizeof(short), FRAMESIZE, ifile) == FRAMESIZE){
                        vencodeframe(ofile, inBuffer, state, coefTable, order, npredictors, FRAMESIZE);
                        currentPos += FRAMESIZE;
                        nBytes += FRAMEBYTES;
                    }
                    else {
                        fprintf(stderr,"%s: Not enough samples in file [%s]\n", progname, argv[1]);
                        exit(1);
                    }
                                        
                }

                /*
                 * Save the state for the start point
                 */
                for (j=0; j<FRAMESIZE; j++){
                    /*
                     * Have to clamp state just in case
                     */
                    if (state[j]>32767)
                        state[j] = 32767;
                    if (state[j]<-32767)
                        state[j] = -32767;
                    aloops[i].state[j] = (short) state[j];
                }
                aloops[i].count = -1; /* -1 is loop forever */

                /*
                 * If the loop length is to short repeat it
                 */

                while (nRepeats > 0){
                    for (; (currentPos+FRAMESIZE) < aloops[i].end; currentPos += FRAMESIZE)
                        if (fread(inBuffer, sizeof(short), FRAMESIZE, ifile) == FRAMESIZE){
                            vencodeframe(ofile, inBuffer, state, coefTable, order, npredictors, FRAMESIZE);
                            nBytes += FRAMEBYTES;
                        }
                    /*
                     * Patch up the end and start
                     */
                    left = aloops[i].end - currentPos;
                    fread(inBuffer, sizeof(short), left, ifile);
                    fseek(ifile, startPointer, SEEK_SET); 
                    fread(inBuffer + left, sizeof(short), FRAMESIZE - left, ifile);
                    vencodeframe(ofile, inBuffer, state, coefTable, order, npredictors, FRAMESIZE);
                    nBytes += FRAMEBYTES;
                    currentPos = aloops[i].start + FRAMESIZE - left;
                    nRepeats--;
                }
                /*
                 * Fix up the file pointer and the loop end point
                 */
                aloops[i].end = newEnd;
            }
    }

    /*
     * Finish up the rest of the file
     */
    nFrames = (CommChunk.numFramesH<<16) + CommChunk.numFramesL;
    if (truncate & (nloops!=0)){
        lookupMarker(&loopEnd, loops[nloops-1].endLoop, markers, numMarkers);
        nFrames = MIN(loopEnd+FRAMESIZE, nFrames);
    }
    
    while (currentPos<nFrames){
        if (nFrames-currentPos < FRAMESIZE){
            nsam = nFrames - currentPos;
        } else
            nsam = FRAMESIZE;
        if (fread(inBuffer, sizeof(short), nsam, ifile) == nsam){
            vencodeframe(ofile, inBuffer, state, coefTable, order, npredictors, nsam);
            currentPos += nsam;
            nBytes += FRAMEBYTES;
        } else{
            fprintf(stderr,"Missed a frame!\n");
            break;
        }
    }
    
    if (nBytes % 2){
        nBytes++;               /* Probably shouldn't be incremented.
        /*
         * Write a pad byte
         */
        ts = 0;
        fwrite(&ts, 1, 1, ofile);
    }
    
    /*
     * Write the LOOP application specific data chunk
     */
    if (nloops > 0){
        strnLen = 11;
        AppChunk.ckID = 'APPL';
        AppChunk.ckSize = nloops*sizeof(ALADPCMloop) + sizeof(long) + strnLen + 1 + 2*sizeof(short);
        AppChunk.formType = 'stoc';
        fwrite(&AppChunk, sizeof(AppChunk), 1, ofile);

        fwrite(&strnLen, 1, 1, ofile);
        fwrite(appLoopName, strnLen, 1, ofile);

        ts = VERSION;
        fwrite(&ts, sizeof(short), 1, ofile);
        fwrite(&nloops, sizeof(short), 1, ofile);
        for (i=0; i<nloops; i++)
            fwrite(&aloops[i], sizeof(ALADPCMloop), 1, ofile);
    }
    
    /*
     * Fill in the data size for the compressed sound data
     */
    fseek(ofile, soundPointer, SEEK_SET);
    CSndChunk.ckID = 'SSND';
    CSndChunk.ckSize = nBytes + 8;
    fwrite(&CSndChunk, sizeof(ChunkHeader), 1, ofile);

    fseek(ofile, cChunkPos, SEEK_SET);
    nFrames = FRAMESIZE*nBytes/FRAMEBYTES;
    CommChunk.numFramesH = nFrames>>16;
    CommChunk.numFramesL = nFrames & 0xffff;
    fwrite(&CommChunk, sizeof(CommonChunk), 1, ofile);

    fclose(ifile);
    fclose(ofile);
}