libcm is a C development framework with an emphasis on audio signal processing applications.
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cmMidiFile.h 9.3KB

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  1. #ifndef cmMidiFile_h
  2. #define cmMidiFile_h
  3. #ifdef __cplusplus
  4. extern "C" {
  5. #endif
  6. //( { file_desc:"MIDI file reader and writer." kw:[midi file]}
  7. // MIDI file timing:
  8. // Messages in the MIDI file are time tagged with a delta offset in 'ticks'
  9. // from the previous message in the same track.
  10. //
  11. // A 'tick' can be converted to microsends as follows:
  12. //
  13. // microsecond per tick = micros per quarter note / ticks per quarter note
  14. //
  15. // MpT = MpQN / TpQN
  16. //
  17. // TpQN is given as a constant in the MIDI file header.
  18. // MpQN is given as the value of the MIDI file tempo message.
  19. //
  20. // See cmMidiFileSeekUSecs() for an example of converting ticks to milliseconds.
  21. //
  22. // As part of the file reading process, the status byte of note-on messages
  23. // with velocity=0 are is changed to a note-off message. See _cmMidiFileReadChannelMsg().
  24. //)
  25. //(
  26. typedef cmHandle_t cmMidiFileH_t;
  27. typedef unsigned cmMfRC_t;
  28. typedef struct
  29. {
  30. cmMidiByte_t hr;
  31. cmMidiByte_t min;
  32. cmMidiByte_t sec;
  33. cmMidiByte_t frm;
  34. cmMidiByte_t sfr;
  35. } cmMidiSmpte_t;
  36. typedef struct
  37. {
  38. cmMidiByte_t num;
  39. cmMidiByte_t den;
  40. cmMidiByte_t metro;
  41. cmMidiByte_t th2s;
  42. } cmMidiTimeSig_t;
  43. typedef struct
  44. {
  45. cmMidiByte_t key;
  46. cmMidiByte_t scale;
  47. } cmMidiKeySig_t;
  48. struct cmMidiTrackMsg_str;
  49. typedef struct
  50. {
  51. cmMidiByte_t ch;
  52. cmMidiByte_t d0;
  53. cmMidiByte_t d1;
  54. unsigned durMicros; // note duration in microseconds (corrected for tempo changes)
  55. struct cmMidiTrackMsg_str* end; // note-off or pedal-up message
  56. } cmMidiChMsg_t;
  57. typedef struct cmMidiTrackMsg_str
  58. {
  59. unsigned uid; // uid's are unique among all msg's in the file
  60. unsigned dtick; // delta ticks between events on this track
  61. unsigned long long atick; // global (all tracks interleaved) accumulated ticks
  62. unsigned long long amicro; // global (all tracks interleaved) accumulated microseconds adjusted for tempo changes
  63. cmMidiByte_t status; // ch msg's have the channel value removed (it is stored in u.chMsgPtr->ch)
  64. cmMidiByte_t metaId; //
  65. unsigned short trkIdx; //
  66. unsigned byteCnt; // length of data pointed to by u.voidPtr (or any other pointer in the union)
  67. struct cmMidiTrackMsg_str* link; // link to next record in this track
  68. union
  69. {
  70. cmMidiByte_t bVal;
  71. unsigned iVal;
  72. unsigned short sVal;
  73. const char* text;
  74. const void* voidPtr;
  75. const cmMidiSmpte_t* smptePtr;
  76. const cmMidiTimeSig_t* timeSigPtr;
  77. const cmMidiKeySig_t* keySigPtr;
  78. const cmMidiChMsg_t* chMsgPtr;
  79. const cmMidiByte_t* sysExPtr;
  80. } u;
  81. } cmMidiTrackMsg_t;
  82. #define cmMidiFileIsNoteOn(m) (cmMidiIsNoteOn((m)->status) && (m)->u.chMsgPtr->d1>0)
  83. #define cmMidiFileIsNoteOff(m) (cmMidiIsNoteOff((m)->status,(m)->u.chMsgPtr->d1))
  84. #define cmMidiFileIsSustainPedalUp(m) (cmMidiIsSustainPedalUp( (m)->status,(m)->u.chMsgPtr->d0,(m)->u.chMsgPtr->d1))
  85. #define cmMidiFileIsSustainPedalDown(m) (cmMidiIsSustainPedalDown( (m)->status,(m)->u.chMsgPtr->d0,(m)->u.chMsgPtr->d1))
  86. #define cmMidiFileIsSostenutoPedalUp(m) (cmMidiIsSostenutoPedalUp( (m)->status,(m)->u.chMsgPtr->d0,(m)->u.chMsgPtr->d1))
  87. #define cmMidiFileIsSostenutoPedalDown(m) (cmMidiIsSostenutoPedalDown((m)->status,(m)->u.chMsgPtr->d0,(m)->u.chMsgPtr->d1))
  88. enum
  89. {
  90. kOkMfRC = cmOkRC, // 0
  91. kFileFailMfRC, // 1
  92. kNotAMidiFileMfRC, // 2
  93. kMemAllocFailMfRC, // 3
  94. kFileCorruptMfRC, // 4
  95. kMissingEoxMfRC, // 5
  96. kUnknownMetaIdMfRC, // 6
  97. kInvalidHandleMfRC, // 7
  98. kMissingNoteOffMfRC, // 8
  99. kInvalidStatusMfRC, // 9
  100. kSustainPedalMfRC, // 10
  101. kSostenutoPedalMfRC, // 11
  102. kLargeDeltaTickMfRC, // 12 (a large delta tick value was filtered)
  103. kUidNotFoundMfRC, // 13
  104. kUidNotANoteMsgMfRC, // 14
  105. kInvalidTrkIndexMfRC // 15
  106. };
  107. extern cmMidiFileH_t cmMidiFileNullHandle;
  108. cmMfRC_t cmMidiFileOpen( cmCtx_t* ctx, cmMidiFileH_t* h, const char* fn );
  109. cmMfRC_t cmMidiFileCreate( cmCtx_t* ctx, cmMidiFileH_t* hp, unsigned trkN, unsigned ticksPerQN );
  110. cmMfRC_t cmMidiFileClose( cmMidiFileH_t* hp );
  111. cmMfRC_t cmMidiFileWrite( cmMidiFileH_t h, const char* fn );
  112. bool cmMidiFileIsValid( cmMidiFileH_t h );
  113. // Returns track count or kInvalidCnt if 'h' is invalid.
  114. unsigned cmMidiFileTrackCount( cmMidiFileH_t h );
  115. // Return midi file format id (0,1,2) or kInvalidId if 'h' is invalid.
  116. unsigned cmMidiFileType( cmMidiFileH_t h );
  117. // Returns ticks per quarter note or kInvalidMidiByte if 'h' is
  118. // invalid or 0 if file uses SMPTE ticks per frame time base.
  119. unsigned cmMidiFileTicksPerQN( cmMidiFileH_t h );
  120. // The file name used in an earlier call to midiFileOpen() or NULL if this
  121. // midi file did not originate from an actual file.
  122. const char* cmMidiFileName( cmMidiFileH_t h );
  123. // Returns SMPTE ticks per frame or kInvalidMidiByte if 'h' is
  124. // invalid or 0 if file uses ticks per quarter note time base.
  125. cmMidiByte_t cmMidiFileTicksPerSmpteFrame( cmMidiFileH_t h );
  126. // Returns SMPTE format or kInvalidMidiByte if 'h' is invalid or 0
  127. // if file uses ticks per quarter note time base.
  128. cmMidiByte_t cmMidiFileSmpteFormatId( cmMidiFileH_t h );
  129. // Returns count of records in track 'trackIdx' or kInvalidCnt if 'h' is invalid.
  130. unsigned cmMidiFileTrackMsgCount( cmMidiFileH_t h, unsigned trackIdx );
  131. // Returns base of record chain from track 'trackIdx' or NULL if 'h' is invalid.
  132. const cmMidiTrackMsg_t* cmMidiFileTrackMsg( cmMidiFileH_t h, unsigned trackIdx );
  133. // Returns the total count of records in the midi file and the
  134. // number in the array returned by cmMidiFileMsgArray().
  135. // Return kInvalidCnt if 'h' is invalid.
  136. unsigned cmMidiFileMsgCount( cmMidiFileH_t h );
  137. // Returns a pointer to the base of an array of pointers to all records
  138. // in the file sorted in ascending time order.
  139. // Returns NULL if 'h' is invalid.
  140. const cmMidiTrackMsg_t** cmMidiFileMsgArray( cmMidiFileH_t h );
  141. // Set the velocity of a note-on/off msg identified by 'uid'.
  142. cmMfRC_t cmMidiFileSetVelocity( cmMidiFileH_t h, unsigned uid, cmMidiByte_t vel );
  143. // Insert a MIDI message relative to the reference msg identified by 'uid'.
  144. // If dtick is positive/negative then the new msg is inserted after/before the reference msg.
  145. cmMfRC_t cmMidiFileInsertMsg( cmMidiFileH_t h, unsigned uid, int dtick, cmMidiByte_t ch, cmMidiByte_t status, cmMidiByte_t d0, cmMidiByte_t d1 );
  146. //
  147. // Insert a new cmMidiTrackMsg_t into the MIDI file on the specified track.
  148. //
  149. // Only the following fields need be set in 'msg'.
  150. // atick - used to position the msg in the track
  151. // status - this field is always set (Note that channel information must stripped from the status byte and included in the channel msg data)
  152. // metaId - this field is optional depending on the msg type
  153. // byteCnt - used to allocate storage for the data element in 'cmMidiTrackMsg_t.u'
  154. // u - the message data
  155. //
  156. cmMfRC_t cmMidiFileInsertTrackMsg( cmMidiFileH_t h, unsigned trkIdx, const cmMidiTrackMsg_t* msg );
  157. cmMfRC_t cmMidiFileInsertTrackChMsg( cmMidiFileH_t h, unsigned trkIdx, unsigned atick, cmMidiByte_t status, cmMidiByte_t d0, cmMidiByte_t d1 );
  158. cmMfRC_t cmMidFileInsertTrackTempoMsg( cmMidiFileH_t h, unsigned trkIdx, unsigned atick, unsigned bpm );
  159. // Return a pointer to the first msg at or after 'usecsOffs' or kInvalidIdx if no
  160. // msg exists after 'usecsOffs'. Note that 'usecOffs' is an offset from the beginning
  161. // of the file.
  162. // On return *'msgUsecsPtr' is set to the actual time of the msg.
  163. // (which will be equal to or greater than 'usecsOffs').
  164. unsigned cmMidiFileSeekUsecs( cmMidiFileH_t h, unsigned long long usecsOffs, unsigned* msgUsecsPtr, unsigned* newMicrosPerTickPtr );
  165. double cmMidiFileDurSecs( cmMidiFileH_t h );
  166. // Calculate Note Duration
  167. void cmMidiFileCalcNoteDurations( cmMidiFileH_t h );
  168. // Set the delay prior to the first non-zero msg.
  169. void cmMidiFileSetDelay( cmMidiFileH_t h, unsigned ticks );
  170. // This function packs a track msg into a single consecutive
  171. // block of memory buf[ bufByteCnt ]. Call cmMidiFilePackTracMsgBufByteCount()
  172. // to get the required buffer length for any given cmMidiTrackMsg_t instance.
  173. cmMidiTrackMsg_t* cmMidiFilePackTrackMsg( const cmMidiTrackMsg_t* m, void* buf, unsigned bufByteCnt );
  174. unsigned cmMidiFilePackTrackMsgBufByteCount( const cmMidiTrackMsg_t* m );
  175. void cmMidiFilePrintMsgs( cmMidiFileH_t h, cmRpt_t* rpt );
  176. void cmMidiFilePrintTrack( cmMidiFileH_t h, unsigned trkIdx, cmRpt_t* rpt );
  177. void cmMidiFileTest( const char* fn, cmCtx_t* ctx );
  178. // Generate a piano-roll plot description file which can be displayed with cmXScore.m
  179. cmMfRC_t cmMidiFileGenPlotFile( cmCtx_t* ctx, const cmChar_t* midiFn, const cmChar_t* outFn );
  180. //)
  181. #ifdef __cplusplus
  182. }
  183. #endif
  184. #endif