161 lines
3.3 KiB
C++
161 lines
3.3 KiB
C++
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#include "evoral/LibSMF.hpp"
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#include "evoral/Event.hpp"
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#include <cassert>
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#include <iostream>
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using namespace std;
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namespace Evoral {
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/** Attempt to open the SMF file for reading and writing.
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*
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* Currently SMF is always read/write.
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*
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* \return 0 on success
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* -1 if the file can not be opened
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*/
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template<typename Time>
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int
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LibSMF<Time>::open(const std::string& path)
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{
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if (_smf) {
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smf_delete(_smf);
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}
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_smf = smf_load(path.c_str());
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if (!_smf) {
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_smf = smf_new();
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smf_set_ppqn(_smf, _ppqn);
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if(_smf == NULL) {
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return -1;
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}
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}
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_smf_track = smf_get_track_by_number(_smf, 1);
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assert(_smf_track);
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cerr << "number of events: " << _smf_track->number_of_events << endl;
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_empty = !(_smf_track->number_of_events > 0);
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return 0;
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}
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template<typename Time>
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void
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LibSMF<Time>::close()
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{
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assert(false);
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if (_smf) {
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smf_save(_smf, _path.c_str());
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smf_delete(_smf);
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_smf = 0;
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_smf_track = 0;
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}
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}
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template<typename Time>
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void
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LibSMF<Time>::seek_to_start() const
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{
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smf_rewind(_smf);
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}
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/** Read an event from the current position in file.
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*
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* File position MUST be at the beginning of a delta time, or this will die very messily.
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* ev.buffer must be of size ev.size, and large enough for the event. The returned event
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* will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
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* rate given by ppqn() (it is the caller's responsibility to calculate a real time).
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*
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* \a size should be the capacity of \a buf. If it is not large enough, \a buf will
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* be freed and a new buffer allocated in its place, the size of which will be placed
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* in size.
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*
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* Returns event length (including status byte) on success, 0 if event was
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* skipped (eg a meta event), or -1 on EOF (or end of track).
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*/
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template<typename Time>
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int
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LibSMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
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{
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smf_event_t *event;
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assert(delta_t);
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assert(size);
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assert(buf);
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if ((event = smf_get_next_event(_smf)) != NULL) {
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if (smf_event_is_metadata(event)) {
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return 0;
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}
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*delta_t = event->delta_time_pulses;
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int event_size = event->midi_buffer_length;
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assert(event_size > 0);
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// Make sure we have enough scratch buffer
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if (*size < (unsigned)event_size) {
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*buf = (uint8_t*)realloc(*buf, event_size);
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}
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memcpy(*buf, event->midi_buffer, size_t(event_size));
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*size = event_size;
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return event_size;
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} else {
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return -1;
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}
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}
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template<typename Time>
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void
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LibSMF<Time>::append_event_unlocked(uint32_t delta_t, const Event<Time>& ev)
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{
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assert(ev.size() > 0);
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smf_event_t *event;
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event = smf_event_new_from_pointer((void *) ev.buffer(), int(ev.size()));
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assert(event != NULL);
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memcpy(event->midi_buffer, ev.buffer(), ev.size());
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assert(_smf_track);
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smf_track_add_event_delta_pulses (_smf_track, event, int(delta_t));
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_last_ev_time = ev.time();
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if (ev.size() > 0) {
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_empty = false;
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}
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}
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template<typename Time>
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void
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LibSMF<Time>::begin_write(FrameTime start_frame)
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{
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assert(_smf_track);
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smf_track_delete(_smf_track);
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_smf_track = smf_track_new();
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assert(_smf_track);
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smf_add_track(_smf, _smf_track);
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assert(_smf->number_of_tracks == 1);
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_last_ev_time = 0;
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}
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template<typename Time>
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void
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LibSMF<Time>::end_write()
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{
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smf_save(_smf, _path.c_str());
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}
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template class LibSMF<double>;
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} // namespace Evoral
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