libcm is a C development framework with an emphasis on audio signal processing applications.
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cmMidi.c 6.4KB

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  1. #include "cmPrefix.h"
  2. #include "cmGlobal.h"
  3. #include "cmTime.h"
  4. #include "cmMidi.h"
  5. typedef struct
  6. {
  7. cmMidiByte_t status;
  8. cmMidiByte_t byteCnt;
  9. const char* label;
  10. } cmMidiStatusDesc;
  11. cmMidiStatusDesc _cmMidiStatusDescArray[] =
  12. {
  13. // channel messages
  14. { kNoteOffMdId, 2, "nof" },
  15. { kNoteOnMdId, 2, "non" },
  16. { kPolyPresMdId,2, "ppr" },
  17. { kCtlMdId, 2, "ctl" },
  18. { kPgmMdId, 1, "pgm" },
  19. { kChPresMdId, 1, "cpr" },
  20. { kPbendMdId, 2, "pb" },
  21. { kSysExMdId, kInvalidMidiByte,"sex" },
  22. // system common
  23. { kSysComMtcMdId, 1, "mtc" },
  24. { kSysComSppMdId, 2, "spp" },
  25. { kSysComSelMdId, 1, "sel" },
  26. { kSysComUndef0MdId, 0, "cu0" },
  27. { kSysComUndef1MdId, 0, "cu1" },
  28. { kSysComTuneMdId, 0, "tun" },
  29. { kSysComEoxMdId, 0, "eox" },
  30. // system real-time
  31. { kSysRtClockMdId, 0, "clk" },
  32. { kSysRtUndef0MdId,0, "ud0" },
  33. { kSysRtStartMdId, 0, "beg" },
  34. { kSysRtContMdId, 0, "cnt" },
  35. { kSysRtStopMdId, 0, "end" },
  36. { kSysRtUndef1MdId,0, "ud1" },
  37. { kSysRtSenseMdId, 0, "sns" },
  38. { kSysRtResetMdId, 0, "rst" },
  39. { kInvalidStatusMdId, kInvalidMidiByte, "ERR" }
  40. };
  41. cmMidiStatusDesc _cmMidiMetaStatusDescArray[] =
  42. {
  43. { kSeqNumbMdId, 2, "seqn" },
  44. { kTextMdId, -1, "text" },
  45. { kCopyMdId, -1, "copy" },
  46. { kTrkNameMdId, -1, "name" },
  47. { kInstrNameMdId, -1, "instr" },
  48. { kLyricsMdId, -1, "lyric" },
  49. { kMarkerMdId, -1, "mark" },
  50. { kCuePointMdId, -1, "cue" },
  51. { kMidiChMdId, 1, "chan" },
  52. { kEndOfTrkMdId, 0, "eot" },
  53. { kTempoMdId, 3, "tempo" },
  54. { kSmpteMdId, 5, "smpte" },
  55. { kTimeSigMdId, 4, "tsig" },
  56. { kKeySigMdId, 2, "ksig" },
  57. { kSeqSpecMdId, -1, "seqs" },
  58. { kInvalidMetaMdId, kInvalidMidiByte, "ERROR"}
  59. };
  60. cmMidiStatusDesc _cmMidiPedalLabel[] =
  61. {
  62. { kSustainCtlMdId, 0, "sustn" },
  63. { kPortamentoCtlMdId, 0, "porta" },
  64. { kSostenutoCtlMdId, 0, "sostn" },
  65. { kSoftPedalCtlMdId, 0, "soft" },
  66. { kLegatoCtlMdId, 0, "legat" },
  67. { kInvalidMidiByte, kInvalidMidiByte, "ERROR"}
  68. };
  69. //====================================================================================================
  70. const char* cmMidiStatusToLabel( cmMidiByte_t status )
  71. {
  72. unsigned i;
  73. if( !cmMidiIsStatus(status) )
  74. return NULL;
  75. // remove the channel value from ch msg status bytes
  76. if( cmMidiIsChStatus(status) )
  77. status &= 0xf0;
  78. for(i=0; _cmMidiStatusDescArray[i].status != kInvalidStatusMdId; ++i)
  79. if( _cmMidiStatusDescArray[i].status == status )
  80. return _cmMidiStatusDescArray[i].label;
  81. return _cmMidiStatusDescArray[i].label;
  82. }
  83. const char* cmMidiMetaStatusToLabel( cmMidiByte_t metaStatus )
  84. {
  85. int i;
  86. for(i=0; _cmMidiMetaStatusDescArray[i].status != kInvalidMetaMdId; ++i)
  87. if( _cmMidiMetaStatusDescArray[i].status == metaStatus )
  88. break;
  89. return _cmMidiMetaStatusDescArray[i].label;
  90. }
  91. const char* cmMidiPedalLabel( cmMidiByte_t d0 )
  92. {
  93. int i;
  94. for(i=0; _cmMidiPedalLabel[i].status != kInvalidMidiByte; ++i)
  95. if( _cmMidiPedalLabel[i].status == d0 )
  96. break;
  97. return _cmMidiPedalLabel[i].label;
  98. }
  99. cmMidiByte_t cmMidiStatusToByteCount( cmMidiByte_t status )
  100. {
  101. unsigned i;
  102. if( !cmMidiIsStatus(status) )
  103. return kInvalidMidiByte;
  104. // remove the channel value from ch msg status bytes
  105. if( cmMidiIsChStatus(status) )
  106. status &= 0xf0;
  107. for(i=0; _cmMidiStatusDescArray[i].status != kInvalidStatusMdId; ++i)
  108. if( _cmMidiStatusDescArray[i].status == status )
  109. return _cmMidiStatusDescArray[i].byteCnt;
  110. assert(0);
  111. return 0;
  112. }
  113. unsigned cmMidiTo14Bits( cmMidiByte_t d0, cmMidiByte_t d1 )
  114. {
  115. unsigned val = d0;
  116. val <<= 7;
  117. val += d1;
  118. return val;
  119. }
  120. void cmMidiSplit14Bits( unsigned v, cmMidiByte_t* d0Ref, cmMidiByte_t* d1Ref )
  121. {
  122. *d0Ref = (v & 0x3f80) >> 7;
  123. *d1Ref = v & 0x7f;
  124. }
  125. int cmMidiToPbend( cmMidiByte_t d0, cmMidiByte_t d1 )
  126. {
  127. int v = cmMidiTo14Bits(d0,d1);
  128. return v - 8192;
  129. }
  130. void cmMidiSplitPbend( int v, cmMidiByte_t* d0Ref, cmMidiByte_t* d1Ref )
  131. {
  132. unsigned uv = v + 8192;
  133. cmMidiSplit14Bits(uv,d0Ref,d1Ref);
  134. }
  135. //====================================================================================================
  136. const char* cmMidiToSciPitch( cmMidiByte_t pitch, char* label, unsigned labelCharCnt )
  137. {
  138. static char buf[ kMidiSciPitchCharCnt ];
  139. if( label == NULL || labelCharCnt == 0 )
  140. {
  141. label = buf;
  142. labelCharCnt = kMidiSciPitchCharCnt;
  143. }
  144. assert( labelCharCnt >= kMidiSciPitchCharCnt );
  145. if( /*pitch < 0 ||*/ pitch > 127 )
  146. {
  147. label[0] = 0;
  148. return label;
  149. }
  150. assert( labelCharCnt >= 5 && /*pitch >= 0 &&*/ pitch <= 127 );
  151. char noteV[] = { 'C', 'C', 'D', 'D', 'E', 'F', 'F', 'G', 'G', 'A', 'A', 'B' };
  152. char shrpV[] = { ' ', '#', ' ', '#', ' ', ' ', '#', ' ', '#', ' ', '#', ' ' };
  153. int octave = (pitch / 12)-1;
  154. unsigned noteIdx = pitch % 12;
  155. char noteCh = noteV[ noteIdx ];
  156. char sharpCh = shrpV[ noteIdx ];
  157. unsigned idx = 1;
  158. label[labelCharCnt-1] = 0;
  159. label[0] = noteCh;
  160. if( sharpCh != ' ' )
  161. {
  162. label[1] = sharpCh;
  163. idx = 2;
  164. }
  165. assert( -1 <= octave && octave <= 9);
  166. snprintf(label+idx,kMidiSciPitchCharCnt-idx-1,"%i",octave);
  167. return label;
  168. }
  169. cmMidiByte_t cmSciPitchToMidiPitch( cmChar_t pitch, int acc, int octave )
  170. {
  171. int idx = -1;
  172. switch(tolower(pitch))
  173. {
  174. case 'a': idx = 9; break;
  175. case 'b': idx = 11; break;
  176. case 'c': idx = 0; break;
  177. case 'd': idx = 2; break;
  178. case 'e': idx = 4; break;
  179. case 'f': idx = 5; break;
  180. case 'g': idx = 7; break;
  181. default:
  182. return kInvalidMidiPitch;
  183. }
  184. unsigned rv = (octave*12) + idx + acc + 12;
  185. if( rv <= 127 )
  186. return rv;
  187. return kInvalidMidiPitch;
  188. }
  189. cmMidiByte_t cmSciPitchToMidi( const char* sciPitchStr )
  190. {
  191. const char* cp = sciPitchStr;
  192. bool sharpFl = false;
  193. bool flatFl = false;
  194. int octave;
  195. int acc = 0;
  196. if( sciPitchStr==NULL || strlen(sciPitchStr) > 5 )
  197. return kInvalidMidiPitch;
  198. // skip over leading letter
  199. ++cp;
  200. if( !(*cp) )
  201. return kInvalidMidiPitch;
  202. if((sharpFl = *cp=='#') == true )
  203. acc = 1;
  204. else
  205. if((flatFl = *cp=='b') == true )
  206. acc = -1;
  207. if( sharpFl || flatFl )
  208. {
  209. ++cp;
  210. if( !(*cp) )
  211. return kInvalidMidiPitch;
  212. }
  213. if( isdigit(*cp) == false && *cp!='-' )
  214. return kInvalidMidiPitch;
  215. octave = atoi(cp);
  216. return cmSciPitchToMidiPitch( *sciPitchStr, acc, octave );
  217. }