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4
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1 /*
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2
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3 Name: LOAD_WAV.C
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4
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5 Description:
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6 WAV Streaming Audio Loader / Player
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7
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8 Portability:
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9 All compilers -- All systems (hopefully)
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10
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11 */
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12
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13 #include "mikmod.h"
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14 #include <string.h>
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15
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16
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17 typedef struct
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18 { CHAR rID[4];
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19 ULONG rLen;
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20 CHAR wID[4];
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21 CHAR fID[4];
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22 ULONG fLen;
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23 UWORD wFormatTag;
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24 UWORD nChannels;
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25 ULONG nSamplesPerSec;
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26 ULONG nAvgBytesPerSec;
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27 UWORD nBlockAlign;
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28 UWORD nFormatSpecific;
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29 } WAV;
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30
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31
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32 BOOL WAV_Load(void)
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33 {
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34 SAMPLE *si;
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35 static WAV wh;
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36 static CHAR dID[4];
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37
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38 // read wav header
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39
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40 _mm_read_string(wh.rID,4,stream_fp);
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41 wh.rLen = _mm_read_I_ULONG(stream_fp);
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42 _mm_read_string(wh.wID,4,stream_fp);
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43 _mm_read_string(wh.fID,4,stream_fp);
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44 wh.fLen = _mm_read_I_ULONG(stream_fp);
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45 wh.wFormatTag = _mm_read_I_UWORD(stream_fp);
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46 wh.nChannels = _mm_read_I_UWORD(stream_fp);
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47 wh.nSamplesPerSec = _mm_read_I_ULONG(stream_fp);
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48 wh.nAvgBytesPerSec = _mm_read_I_ULONG(stream_fp);
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49 wh.nBlockAlign = _mm_read_I_UWORD(stream_fp);
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50 wh.nFormatSpecific = _mm_read_I_UWORD(stream_fp);
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51
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52 // check it
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53
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54 if( feof(stream_fp) ||
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55 memcmp(wh.rID,"RIFF",4) ||
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56 memcmp(wh.wID,"WAVE",4) ||
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57 memcmp(wh.fID,"fmt ",4) )
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58 {
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59 _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
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60 return NULL;
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61 }
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62
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63 // skip other crap
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64
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65 _mm_fseek(stream_fp,wh.fLen-16,SEEK_CUR);
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66 _mm_read_string(dID,4,stream_fp);
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67
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68 if( memcmp(dID,"data",4) )
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69 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
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70 return NULL;
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71 }
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72
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73 if(wh.nChannels > 1)
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74 { _mm_errno = MMERR_UNKNOWN_WAVE_TYPE;
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75 return NULL;
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76 }
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77
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78 // printf("wFormatTag: %x\n",wh.wFormatTag);
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79 // printf("blockalign: %x\n",wh.nBlockAlign);
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80 // prinff("nFormatSpc: %x\n",wh.nFormatSpecific);
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81
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82 if((si=(SAMPLE *)_mm_calloc(1,sizeof(SAMPLE)))==NULL) return NULL;
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83
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84 si->speed = wh.nSamplesPerSec/wh.nChannels;
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85 si->volume = 64;
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86
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87 si->length = _mm_read_I_ULONG(stream_fp);
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88
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89 if(wh.nBlockAlign==2)
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90 { si->flags = SF_16BITS | SF_SIGNED;
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91 si->length>>=1;
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92 }
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93
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94 return 0;
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95 }
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96
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97
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