1 #include "evoral/LibSMF.hpp"
2 #include "evoral/Event.hpp"
12 /** Attempt to open the SMF file for reading and writing.
14 * Currently SMF is always read/write.
16 * \return 0 on success
17 * -1 if the file can not be opened
19 template<typename Time>
21 LibSMF<Time>::open(const std::string& path)
27 _smf = smf_load(path.c_str());
30 smf_set_ppqn(_smf, _ppqn);
37 _smf_track = smf_get_track_by_number(_smf, 1);
40 cerr << "number of events: " << _smf_track->number_of_events << endl;
42 _empty = !(_smf_track->number_of_events > 0);
47 template<typename Time>
53 smf_save(_smf, _path.c_str());
60 template<typename Time>
62 LibSMF<Time>::seek_to_start() const
67 /** Read an event from the current position in file.
69 * File position MUST be at the beginning of a delta time, or this will die very messily.
70 * ev.buffer must be of size ev.size, and large enough for the event. The returned event
71 * will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
72 * rate given by ppqn() (it is the caller's responsibility to calculate a real time).
74 * \a size should be the capacity of \a buf. If it is not large enough, \a buf will
75 * be freed and a new buffer allocated in its place, the size of which will be placed
78 * Returns event length (including status byte) on success, 0 if event was
79 * skipped (eg a meta event), or -1 on EOF (or end of track).
81 template<typename Time>
83 LibSMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
91 if ((event = smf_get_next_event(_smf)) != NULL) {
92 if (smf_event_is_metadata(event)) {
95 *delta_t = event->delta_time_pulses;
97 int event_size = event->midi_buffer_length;
98 assert(event_size > 0);
100 // Make sure we have enough scratch buffer
101 if (*size < (unsigned)event_size) {
102 *buf = (uint8_t*)realloc(*buf, event_size);
104 memcpy(*buf, event->midi_buffer, size_t(event_size));
113 template<typename Time>
115 LibSMF<Time>::append_event_unlocked(uint32_t delta_t, const Event<Time>& ev)
117 assert(ev.size() > 0);
121 event = smf_event_new_from_pointer((void *) ev.buffer(), int(ev.size()));
122 assert(event != NULL);
124 memcpy(event->midi_buffer, ev.buffer(), ev.size());
127 smf_track_add_event_delta_pulses (_smf_track, event, int(delta_t));
128 _last_ev_time = ev.time();
135 template<typename Time>
137 LibSMF<Time>::begin_write(FrameTime start_frame)
140 smf_track_delete(_smf_track);
142 _smf_track = smf_track_new();
145 smf_add_track(_smf, _smf_track);
146 assert(_smf->number_of_tracks == 1);
151 template<typename Time>
153 LibSMF<Time>::end_write()
155 smf_save(_smf, _path.c_str());
158 template class LibSMF<double>;
160 } // namespace Evoral