command-line utility to translate between Mackie HUI and Open Sound Control
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main.c 2.4KB

il y a 4 ans
il y a 4 ans
il y a 4 ans
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  1. /*
  2. * Programmer: Dominik Schmidt-Philipp <schmidt-philipp@kulturteknologi.no>
  3. * Filename: main.c
  4. *
  5. * Dedicated to seleomlivet
  6. *
  7. */
  8. #include <alsa/asoundlib.h>
  9. #include <pthread.h> /* for threading */
  10. // function declarations:
  11. void alsa_error (const char *format, ...);
  12. void* midiinfunction (void * arg);
  13. void midi_in_dispatch (void * arg, unsigned char * m);
  14. typedef struct {
  15. snd_rawmidi_t* midiin;
  16. snd_rawmidi_t* midiout;
  17. unsigned char hui_in_zone;
  18. } housicIO;
  19. int main(int argc, char *argv[]) {
  20. int status;
  21. int mode = SND_RAWMIDI_SYNC;
  22. pthread_t midiinthread;
  23. housicIO IOs = {NULL,NULL,0};
  24. // snd_rawmidi_t* midiin = NULL;
  25. const char* portname = "virtual";
  26. if ((status = snd_rawmidi_open(&IOs.midiin, NULL, portname, mode)) < 0) {
  27. alsa_error("Problem opening MIDI input: %s", snd_strerror(status));
  28. exit(1);
  29. }
  30. status = pthread_create(&midiinthread, NULL, midiinfunction, &IOs);
  31. pthread_join(midiinthread, NULL);
  32. //snd_rawmidi_close(midiin);
  33. //midiin=NULL;
  34. return 0;
  35. }
  36. //////////////////////////////
  37. //
  38. // midiinfunction -- Thread function which waits around until a MIDI
  39. // input byte arrives and then react correspondingly
  40. //
  41. void *midiinfunction(void *arg) {
  42. housicIO* IOs = (housicIO*)arg;
  43. snd_rawmidi_t* midiin = IOs->midiin;
  44. int status;
  45. int i = 0;
  46. char buffer[3];
  47. unsigned char message[3];
  48. while (1) {
  49. if ((status = snd_rawmidi_read(midiin, buffer, 3)) < 0) {
  50. alsa_error("Problem reading MIDI input: %s", snd_strerror(status));
  51. }
  52. // in case of MIDI running status, value bytes need to not override status byte
  53. for (i=1; i<=status;i++) {
  54. message[3-i] = (unsigned char) buffer[status-i];
  55. }
  56. midi_in_dispatch(IOs,message);
  57. fflush(stdout);
  58. }
  59. }
  60. //////////////////////////////
  61. //
  62. // midi_in_dispatch -- Thread function which waits around until a MIDI
  63. // input byte arrives and then react correspondingly
  64. //
  65. void midi_in_dispatch(void *arg, unsigned char *m) {
  66. housicIO* IOs = (housicIO*)arg;
  67. if (m[0] == 0xb0) {
  68. // received a CC message on MIDIchannel 1
  69. if (m[1] == 0x0f) {
  70. // received a zone select
  71. IOs->hui_in_zone = m[2];
  72. }
  73. }
  74. }
  75. //////////////////////////////
  76. //
  77. // error -- print error message
  78. //
  79. void alsa_error(const char *format, ...) {
  80. va_list ap;
  81. va_start(ap, format);
  82. vfprintf(stderr, format, ap);
  83. va_end(ap);
  84. putc('\n', stderr);
  85. }