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annotate dmwav.c @ 382:371edff7dc3d

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Fix extern variables to match what are actually declared in dmengine.c
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 17 Oct 2012 18:15:53 +0300
parents 9622c139cb9f
children 7e73d733b96f
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9622c139cb9f Separate the WAV header / chunk writing functions from mod2wav into dmwav.[ch]
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1 /*
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2 * DMLib
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3 * -- Wav file writing
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4 * Programmed and designed by Matti 'ccr' Hamalainen
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5 * (C) Copyright 2012 Tecnic Software productions (TNSP)
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6 */
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7 #include "dmwav.h"
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8 #include "dmfile.h"
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9
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11 BOOL dmWriteWAVChunk(FILE * f, DMWaveChunk *ch)
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12 {
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13 if (!dm_fwrite_str(f, ch->chunkID, 4)) return FALSE;
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14 return dm_fwrite_le32(f, ch->chunkSize);
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15 }
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18 void dmMakeWAVChunk(DMWaveChunk *ch, const char *chunkID, const Uint32 chunkSize)
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19 {
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20 memcpy(&(ch->chunkID), (const void *) chunkID, 4);
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21 ch->chunkSize = chunkSize;
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22 }
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25 void dmWriteWAVHeader(FILE *outFile, int sampBits, int sampFreq, int sampChn, size_t sampLen)
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26 {
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27 DMWaveFile wav;
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28
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29 // PCM WAVE chunk
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30 dmMakeWAVChunk(&wav.chFormat, DM_WAVE_FMT_ID, (2 + 2 + 4 + 4 + 2 + 2));
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31
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32 wav.wFormatTag = DM_WAVE_FORMAT_PCM;
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33 wav.nChannels = sampChn;
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34 wav.nSamplesPerSec = sampFreq;
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35 wav.nAvgBytesPerSec = (sampBits * sampChn * sampFreq) / 8;
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36 wav.nBlockAlign = (sampBits * sampChn) / 8;
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37 wav.wBitsPerSample = sampBits;
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38
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39 // Data chunk
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40 dmMakeWAVChunk(&wav.chData, DM_WAVE_DATA_ID, (sampLen * wav.nBlockAlign));
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41
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42 // RIFF header
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43 memcpy(&wav.riffID, (const void *) DM_WAVE_RIFF_ID, 4);
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44 memcpy(&wav.riffType, (const void *) DM_WAVE_WAVE_ID, 4);
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45 wav.fileSize = ((4 + 4 + 4) + wav.chFormat.chunkSize + wav.chData.chunkSize);
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46
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47 // Write header
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48 dm_fwrite_str(outFile, wav.riffID, sizeof(wav.riffID));
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49 dm_fwrite_le32(outFile, wav.fileSize);
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51 dm_fwrite_str(outFile, wav.riffType, sizeof(wav.riffType));
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52 dmWriteWAVChunk(outFile, &wav.chFormat);
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53
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54 dm_fwrite_le16(outFile, wav.wFormatTag);
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55 dm_fwrite_le16(outFile, wav.nChannels);
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56 dm_fwrite_le32(outFile, wav.nSamplesPerSec);
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57 dm_fwrite_le32(outFile, wav.nAvgBytesPerSec);
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58 dm_fwrite_le16(outFile, wav.nBlockAlign);
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59 dm_fwrite_le16(outFile, wav.wBitsPerSample);
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60
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61 dmWriteWAVChunk(outFile, &wav.chData);
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62 }