diff options
Diffstat (limited to 'libs/evoral/src/SMF.cpp')
| -rw-r--r-- | libs/evoral/src/SMF.cpp | 57 |
1 files changed, 53 insertions, 4 deletions
diff --git a/libs/evoral/src/SMF.cpp b/libs/evoral/src/SMF.cpp index ef460c2eef..ae3c8781a5 100644 --- a/libs/evoral/src/SMF.cpp +++ b/libs/evoral/src/SMF.cpp @@ -184,6 +184,22 @@ SMF::seek_to_start() const _smf_track->next_event_number = 1; } +static void +midify_note_id (event_id_t note_id, uint8_t* buf) +{ + buf[0] = (note_id & 0xfe000000) >> 25; + buf[1] = (note_id & 0x01fc0000) >> 18; + buf[2] = (note_id & 0x0003f800) >> 11; + buf[3] = (note_id & 0x000007f0) >> 4; + buf[4] = (note_id & 0x0000000f); +} + +static event_id_t +unmidify_note_id (uint8_t* buf) +{ + return ((int) buf[0] << 25) | ((int) buf[1] << 18) | ((int) buf[2] << 11) | ((int)buf[3] << 4) | (int) buf[4]; +} + /** Read an event from the current position in file. * * File position MUST be at the beginning of a delta time, or this will die very messily. @@ -195,24 +211,37 @@ SMF::seek_to_start() const * \a size must be the capacity of \a buf. If it is not large enough, \a buf will * be reallocated and *size will be set to the new size of buf. * + * if the event is a meta-event and is an Evoral Note ID, then \a note_id will be set + * to the value of the NoteID; otherwise, meta-events will set \a note_id to -1. + * * \return event length (including status byte) on success, 0 if event was - * skipped (e.g. a meta event), or -1 on EOF (or end of track). + * a meta event, or -1 on EOF (or end of track). */ int -SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const +SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf, event_id_t* note_id) const { smf_event_t* event; assert(delta_t); assert(size); assert(buf); + assert(note_id); if ((event = smf_track_get_next_event(_smf_track)) != NULL) { *delta_t = event->delta_time_pulses; if (smf_event_is_metadata(event)) { - return 0; + *note_id = -1; // "no note id in this meta-event */ + if (event->midi_buffer[1] == 0x99) { // Evoral meta-event + if (event->midi_buffer[2] == 6) { // 6 bytes following + if (event->midi_buffer[3] == 0x1) { // Evoral Note ID + *note_id = unmidify_note_id (&event->midi_buffer[4]); + cerr << "Loaded Event ID " << *note_id << endl; + } + } + } + return 0; /* this is a meta-event */ } int event_size = event->midi_buffer_length; @@ -239,7 +268,7 @@ SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const } void -SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf) +SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf, event_id_t note_id) { if (size == 0) { return; @@ -257,6 +286,26 @@ SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf) smf_event_t* event; + /* XXX july 2010: currently only store event ID's for notes + */ + + if (((buf[0] & 0xf0) == MIDI_CMD_NOTE_ON || ((buf[0] & 0xf0) == MIDI_CMD_NOTE_OFF)) && note_id >= 0) { + event = smf_event_new (); + assert(event != NULL); + + event->midi_buffer = new uint8_t[9]; + event->midi_buffer_length = 9; + + event->midi_buffer[0] = 0xff; // Meta-event + event->midi_buffer[1] = 0x99; // Evoral meta-event + event->midi_buffer[2] = 6; // 6 bytes of data follow */ + event->midi_buffer[3] = 0x1; // Evoral Note ID + midify_note_id (note_id, &event->midi_buffer[4]); + + assert(_smf_track); + smf_track_add_event_delta_pulses(_smf_track, event, 0); + } + event = smf_event_new_from_pointer(buf, size); assert(event != NULL); |