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Annotation of Examples/SoundAndMusic/SoundKit/SoundEditor/SaveToController.m, revision 1.1

1.1     ! root        1: /*
        !             2:  * You may freely copy, distribute and reuse the code in this example.  
        !             3:  * NeXT disclaims any warranty of any kind, expressed or implied, as to 
        !             4:  * its fitness for any particular use.
        !             5:  */
        !             6: 
        !             7: #import "SaveToController.h"
        !             8: #import <appkit/appkit.h>
        !             9: #import <soundkit/soundkit.h>
        !            10: 
        !            11: @implementation SaveToController
        !            12: 
        !            13: #define LINEAR_ROW 0
        !            14: #define MULAW_ROW 1
        !            15: #define COMPRESSED_ROW 2
        !            16: 
        !            17: static int _dataFormatToRow(int dataFormat)
        !            18: {
        !            19:     int format_row;
        !            20: 
        !            21:     switch (dataFormat) {
        !            22:     case SND_FORMAT_LINEAR_16:
        !            23:     case SND_FORMAT_EMPHASIZED:
        !            24:        format_row = LINEAR_ROW;
        !            25:        break;
        !            26:     case SND_FORMAT_MULAW_8:
        !            27:        format_row = MULAW_ROW;
        !            28:        break;
        !            29:     case SND_FORMAT_COMPRESSED:
        !            30:     case SND_FORMAT_COMPRESSED_EMPHASIZED:
        !            31:        format_row = COMPRESSED_ROW;
        !            32:        break;
        !            33:     default:
        !            34:        return LINEAR_ROW; /* Try to convert unsupported formats to linear */
        !            35:     }
        !            36:     return format_row;
        !            37: }
        !            38: 
        !            39: static int _rowToDataFormat(int row)
        !            40: {
        !            41:     int dataFormat;
        !            42:     switch (row) {
        !            43:     case LINEAR_ROW:
        !            44:        dataFormat = SND_FORMAT_LINEAR_16;
        !            45:        break;
        !            46:     case MULAW_ROW:
        !            47:        dataFormat = SND_FORMAT_MULAW_8;
        !            48:        break;
        !            49:     case COMPRESSED_ROW:
        !            50:        dataFormat = SND_FORMAT_COMPRESSED;
        !            51:        break;
        !            52:     default:
        !            53:        return -1;
        !            54:     }
        !            55:     return dataFormat;
        !            56: }
        !            57: 
        !            58: /*
        !            59:  * Note that the Sound object's convertToFormat: method will convert
        !            60:  * to or from any sampling rate.  However, to minimize confusion for
        !            61:  * casual users, we restrict the choices to the three which arise
        !            62:  * naturally on the NeXT Computer.
        !            63:  */
        !            64: static const double supportedRates[3] 
        !            65:        = { SND_RATE_CODEC, SND_RATE_LOW, SND_RATE_HIGH };
        !            66: 
        !            67: static double _rowToSamplingRate(int row)
        !            68: {
        !            69:     if (row < 0 || row > 2) row = 2;
        !            70:     return supportedRates[row];
        !            71: }
        !            72: 
        !            73: static int deq(double d1, double d2)
        !            74: /* Return 1 if d1 and d2 are "equal" to within one int step */
        !            75: {
        !            76:     return ((abs(d1-d2)<=1.0) ? 1 : 0);
        !            77: }
        !            78: 
        !            79: static int _samplingRateToRow(double srate)
        !            80: {
        !            81:     int i;
        !            82:     for (i=0; i<3; i++)
        !            83:       if (deq(srate,supportedRates[i]))
        !            84:        return i;
        !            85:     return 2; /* Try to convert unsupported rates to 44.1 KHz */
        !            86: }
        !            87: 
        !            88: - soundTemplate
        !            89: /* 
        !            90:  * Create an empty sound conveying the requested format
        !            91:  */
        !            92: {
        !            93:     if (!newSound)
        !            94:       newSound = [[Sound alloc] init];
        !            95:     [newSound  setDataSize:sizeof(SNDCompressionSubheader)
        !            96:              /* Conceptually, dataSize is 0 above. However,
        !            97:                if the new format is COMPRESSED a "subheader" 
        !            98:                containing compression parameters is required, and
        !            99:                for historical reasons, the subheader is counted
        !           100:                as data for allocation purposes. */
        !           101:        dataFormat:newDataFormat
        !           102:        samplingRate:newSamplingRate
        !           103:        channelCount:newChannelCount
        !           104:        infoSize:0];      
        !           105:     return newSound;
        !           106: }
        !           107: 
        !           108: - setSound:nSound
        !           109: {
        !           110:     double samplingRate;
        !           111:     int channelCount;
        !           112:     int dataFormat;
        !           113:     int format_row;
        !           114:     int srate_row;
        !           115:     int size;
        !           116: 
        !           117:     sound = nSound;
        !           118: 
        !           119:     newSamplingRate = samplingRate = [sound samplingRate];
        !           120:     newChannelCount = channelCount = [sound channelCount];
        !           121:     newDataFormat = dataFormat = [sound dataFormat];
        !           122:     size = [sound dataSize];
        !           123: 
        !           124:     format_row = _dataFormatToRow(dataFormat);
        !           125:     srate_row = _samplingRateToRow(samplingRate);
        !           126: 
        !           127:     [newChnMtx selectCellAt:channelCount-1:0];
        !           128:     [newFmtMtx selectCellAt:format_row:0];
        !           129:     [newFsMtx selectCellAt:srate_row:0];
        !           130: 
        !           131:     return self;
        !           132: }
        !           133: 
        !           134: - revert:sender
        !           135: {
        !           136:     [self setSound:sound];
        !           137:     return self;
        !           138: }
        !           139: 
        !           140: - setNewChn:sender
        !           141: {
        !           142:     newChannelCount = 1+[sender selectedRow];
        !           143:     return self;
        !           144: }
        !           145: 
        !           146: - setNewFmt:sender
        !           147: {
        !           148:     newDataFormat = _rowToDataFormat([sender selectedRow]);
        !           149:     return self;
        !           150: }
        !           151: 
        !           152: - setNewFs:sender
        !           153: {
        !           154:     newSamplingRate = _rowToSamplingRate([sender selectedRow]);
        !           155:     return self;
        !           156: }
        !           157: 
        !           158: @end

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