384 lines
8.6 KiB
C++
384 lines
8.6 KiB
C++
/* This file is part of Evoral.
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* Copyright (C) 2008 David Robillard <http://drobilla.net>
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* Copyright (C) 2000-2008 Paul Davis
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* Author: Hans Baier
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*
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* Evoral is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <cassert>
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#include <cmath>
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#include <iostream>
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#include <stdint.h>
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#include "libsmf/smf.h"
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#include "evoral/Event.hpp"
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#include "evoral/SMF.hpp"
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#include "evoral/midi_util.h"
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#include "pbd/file_manager.h"
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#ifdef COMPILER_MSVC
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extern double round(double x);
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#endif
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using namespace std;
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namespace Evoral {
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SMF::~SMF()
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{
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if (_smf) {
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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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uint16_t
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SMF::num_tracks() const
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{
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return _smf->number_of_tracks;
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}
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uint16_t
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SMF::ppqn() const
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{
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return _smf->ppqn;
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}
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/** Seek to the specified track (1-based indexing)
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* \return 0 on success
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*/
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int
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SMF::seek_to_track(int track)
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{
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_smf_track = smf_get_track_by_number(_smf, track);
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if (_smf_track != NULL) {
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_smf_track->next_event_number = (_smf_track->number_of_events == 0) ? 0 : 1;
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return 0;
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} else {
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return -1;
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}
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}
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/** Attempt to open the SMF file for reading and/or writing.
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*
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* \return 0 on success
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* -1 if the file can not be opened or created
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* -2 if the file exists but specified track does not exist
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*/
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int
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SMF::open(const std::string& path, int track) THROW_FILE_ERROR
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{
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assert(track >= 1);
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if (_smf) {
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smf_delete(_smf);
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}
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_file_path = path;
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PBD::StdioFileDescriptor d (_file_path, "r");
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FILE* f = d.allocate ();
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if (f == 0) {
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return -1;
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}
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if ((_smf = smf_load (f)) == 0) {
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return -1;
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}
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if ((_smf_track = smf_get_track_by_number(_smf, track)) == 0) {
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return -2;
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}
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//cerr << "Track " << track << " # events: " << _smf_track->number_of_events << endl;
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if (_smf_track->number_of_events == 0) {
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_smf_track->next_event_number = 0;
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_empty = true;
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} else {
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_smf_track->next_event_number = 1;
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_empty = false;
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}
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return 0;
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}
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/** Attempt to create a new SMF file for reading and/or writing.
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*
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* \return 0 on success
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* -1 if the file can not be created
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* -2 if the track can not be created
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*/
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int
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SMF::create(const std::string& path, int track, uint16_t ppqn) THROW_FILE_ERROR
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{
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assert(track >= 1);
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if (_smf) {
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smf_delete(_smf);
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}
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_file_path = path;
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_smf = smf_new();
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if (_smf == NULL) {
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return -1;
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}
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if (smf_set_ppqn(_smf, ppqn) != 0) {
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return -1;
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}
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for (int i = 0; i < track; ++i) {
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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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}
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_smf_track = smf_get_track_by_number(_smf, track);
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if (!_smf_track)
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return -2;
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_smf_track->next_event_number = 0;
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{
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/* put a stub file on disk */
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PBD::StdioFileDescriptor d (_file_path, "w+");
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FILE* f = d.allocate ();
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if (f == 0) {
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return -1;
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}
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if (smf_save (_smf, f)) {
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return -1;
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}
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}
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_empty = true;
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return 0;
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}
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void
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SMF::close() THROW_FILE_ERROR
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{
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if (_smf) {
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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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void
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SMF::seek_to_start() const
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{
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_smf_track->next_event_number = 1;
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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 buf must be a pointer to a buffer allocated with malloc, or a pointer to NULL.
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* \a size must be the capacity of \a buf. If it is not large enough, \a buf will
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* be reallocated and *size will be set to the new size of buf.
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*
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* if the event is a meta-event and is an Evoral Note ID, then \a note_id will be set
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* to the value of the NoteID; otherwise, meta-events will set \a note_id to -1.
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*
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* \return event length (including status byte) on success, 0 if event was
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* a meta event, or -1 on EOF (or end of track).
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*/
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int
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SMF::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf, event_id_t* note_id) 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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assert(note_id);
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if ((event = smf_track_get_next_event(_smf_track)) != NULL) {
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*delta_t = event->delta_time_pulses;
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if (smf_event_is_metadata(event)) {
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*note_id = -1; // "no note id in this meta-event */
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if (event->midi_buffer[1] == 0x7f) { // Sequencer-specific
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uint32_t evsize;
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uint32_t lenlen;
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if (smf_extract_vlq (&event->midi_buffer[2], event->midi_buffer_length-2, &evsize, &lenlen) == 0) {
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if (event->midi_buffer[2+lenlen] == 0x99 && // Evoral
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event->midi_buffer[3+lenlen] == 0x1) { // Evoral Note ID
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uint32_t id;
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uint32_t idlen;
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if (smf_extract_vlq (&event->midi_buffer[4+lenlen], event->midi_buffer_length-(4+lenlen), &id, &idlen) == 0) {
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*note_id = id;
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}
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}
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}
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}
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return 0; /* this is a meta-event */
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}
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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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assert(midi_event_is_valid(*buf, *size));
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/* printf("SMF::read_event @ %u: ", *delta_t);
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for (size_t i = 0; i < *size; ++i) {
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printf("%X ", (*buf)[i]);
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} printf("\n") */
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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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void
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SMF::append_event_delta(uint32_t delta_t, uint32_t size, const uint8_t* buf, event_id_t note_id)
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{
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if (size == 0) {
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return;
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}
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/* printf("SMF::append_event_delta @ %u:", delta_t);
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for (size_t i = 0; i < size; ++i) {
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printf("%X ", buf[i]);
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} printf("\n"); */
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if (!midi_event_is_valid(buf, size)) {
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cerr << "WARNING: SMF ignoring illegal MIDI event" << endl;
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return;
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}
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smf_event_t* event;
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/* XXX july 2010: currently only store event ID's for notes, program changes and bank changes
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*/
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uint8_t const c = buf[0] & 0xf0;
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bool const store_id = (
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c == MIDI_CMD_NOTE_ON ||
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c == MIDI_CMD_NOTE_OFF ||
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c == MIDI_CMD_PGM_CHANGE ||
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(c == MIDI_CMD_CONTROL && (buf[1] == MIDI_CTL_MSB_BANK || buf[1] == MIDI_CTL_LSB_BANK))
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);
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if (store_id && note_id >= 0) {
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int idlen;
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int lenlen;
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uint8_t idbuf[16];
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uint8_t lenbuf[16];
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event = smf_event_new ();
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assert(event != NULL);
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/* generate VLQ representation of note ID */
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idlen = smf_format_vlq (idbuf, sizeof(idbuf), note_id);
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/* generate VLQ representation of meta event length,
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which is the idlen + 2 bytes (Evoral type ID plus Note ID type)
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*/
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lenlen = smf_format_vlq (lenbuf, sizeof(lenbuf), idlen+2);
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event->midi_buffer_length = 2 + lenlen + 2 + idlen;
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/* this should be allocated by malloc(3) because libsmf will
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call free(3) on it
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*/
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event->midi_buffer = (uint8_t*) malloc (sizeof (uint8_t*) * event->midi_buffer_length);
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event->midi_buffer[0] = 0xff; // Meta-event
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event->midi_buffer[1] = 0x7f; // Sequencer-specific
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memcpy (&event->midi_buffer[2], lenbuf, lenlen);
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event->midi_buffer[2+lenlen] = 0x99; // Evoral type ID
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event->midi_buffer[3+lenlen] = 0x1; // Evoral type Note ID
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memcpy (&event->midi_buffer[4+lenlen], idbuf, idlen);
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assert(_smf_track);
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smf_track_add_event_delta_pulses(_smf_track, event, 0);
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}
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event = smf_event_new_from_pointer(buf, size);
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assert(event != NULL);
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assert(_smf_track);
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smf_track_add_event_delta_pulses(_smf_track, event, delta_t);
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_empty = false;
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}
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void
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SMF::begin_write()
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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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}
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void
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SMF::end_write() THROW_FILE_ERROR
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{
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PBD::StdioFileDescriptor d (_file_path, "w+");
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FILE* f = d.allocate ();
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if (f == 0) {
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throw FileError (_file_path);
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}
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if (smf_save(_smf, f) != 0) {
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throw FileError (_file_path);
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}
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}
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double
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SMF::round_to_file_precision (double val) const
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{
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double div = ppqn();
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return round (val * div) / div;
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}
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void
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SMF::set_path (const std::string& p)
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{
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_file_path = p;
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}
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} // namespace Evoral
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