1 /* This file is part of Evoral.
2 * Copyright (C) 2008 Dave Robillard <http://drobilla.net>
3 * Copyright (C) 2000-2008 Paul Davis
5 * Evoral is free software; you can redistribute it and/or modify it under the
6 * terms of the GNU General Public License as published by the Free Software
7 * Foundation; either version 2 of the License, or (at your option) any later
10 * Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
11 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #include <glibmm/miscutils.h>
26 #include "evoral/midi_util.h"
27 #include "evoral/SMF.hpp"
28 #include "evoral/SMFReader.hpp"
29 #include "evoral/Event.hpp"
39 , _track_size(4) // 4 bytes for the ever-present EOT event
50 /** Attempt to open the SMF file for reading and writing.
52 * Currently SMF is always read/write.
54 * \return 0 on success
55 * -1 if the file can not be opened for reading,
56 * -2 if the file can not be opened for writing
60 SMF<T>::open(const std::string& path)
62 //cerr << "Opening SMF file " << path() << " writeable: " << writable() << endl;
63 _fd = fopen(path.c_str(), "r+");
65 // File already exists
67 fseek(_fd, _header_size - 4, 0);
68 uint32_t track_size_be = 0;
69 fread(&track_size_be, 4, 1, _fd);
70 _track_size = GUINT32_FROM_BE(track_size_be);
71 _empty = _track_size > 4;
72 //cerr << "SMF - read track size " << _track_size << endl;
74 // We're making a new file
76 _fd = fopen(path.c_str(), "w+");
78 cerr << "ERROR: Can not open SMF file " << path << " for writing: " <<
79 strerror(errno) << endl;
85 // Write a tentative header just to pad things out so writing happens in the right spot
90 return (_fd == 0) ? -1 : 0;
107 SMF<T>::seek_to_start() const
109 fseek(_fd, _header_size, SEEK_SET);
114 SMF<T>::seek_to_footer_position()
118 // Check if there is a track end marker at the end of the data
119 fseek(_fd, -4, SEEK_END);
120 size_t read_bytes = fread(buffer, sizeof(uint8_t), 4, _fd);
122 if ((read_bytes == 4)
126 && buffer[3] == 0x00) {
127 // there is one, so overwrite it
128 fseek(_fd, -4, SEEK_END);
130 // there is none, so append
131 fseek(_fd, 0, SEEK_END);
144 SMF<T>::flush_header()
146 // FIXME: write timeline position somehow?
148 //cerr << path() << " SMF Flushing header\n";
152 const uint16_t type = GUINT16_TO_BE(0); // SMF Type 0 (single track)
153 const uint16_t ntracks = GUINT16_TO_BE(1); // Number of tracks (always 1 for Type 0)
154 const uint16_t division = GUINT16_TO_BE(_ppqn); // Pulses per quarter note (beat)
157 memcpy(data, &type, 2);
158 memcpy(data+2, &ntracks, 2);
159 memcpy(data+4, &division, 2);
161 //_fd = freopen(path().c_str(), "r+", _fd);
163 fseek(_fd, 0, SEEK_SET);
164 write_chunk("MThd", 6, data);
165 write_chunk_header("MTrk", _track_size);
174 SMF<T>::flush_footer()
176 //cerr << path() << " SMF Flushing footer\n";
177 seek_to_footer_position();
179 seek_to_footer_position();
186 SMF<T>::write_footer()
189 char eot[3] = { 0xFF, 0x2F, 0x00 }; // end-of-track meta-event
190 fwrite(eot, 1, 3, _fd);
195 /** Read an event from the current position in file.
197 * File position MUST be at the beginning of a delta time, or this will die very messily.
198 * ev.buffer must be of size ev.size, and large enough for the event. The returned event
199 * will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
200 * rate given by ppqn() (it is the caller's responsibility to calculate a real time).
202 * \a size should be the capacity of \a buf. If it is not large enough, \a buf will
203 * be freed and a new buffer allocated in its place, the size of which will be placed
206 * Returns event length (including status byte) on success, 0 if event was
207 * skipped (eg a meta event), or -1 on EOF (or end of track).
211 SMF<T>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
222 *delta_t = SMFReader::read_var_len(_fd);
224 return -1; // Premature EOF
228 return -1; // Premature EOF
231 const int status = fgetc(_fd);
234 return -1; // Premature EOF
237 //printf("Status @ %X = %X\n", (unsigned)ftell(_fd) - 1, status);
239 if (status == 0xFF) {
241 return -1; // Premature EOF
243 const int type = fgetc(_fd);
244 if ((unsigned char)type == 0x2F) {
245 return -1; // hit end of track
252 int event_size = midi_event_size((unsigned char)status);
253 if (event_size <= 0) {
254 // if sysex, determine the size of the event
255 if ((status & 0xF0) == MIDI_CMD_COMMON_SYSEX) {
256 fpos_t after_sysex_status_byte_position;
257 int success = fgetpos(_fd, &after_sysex_status_byte_position);
258 assert(success == 0);
262 int byte = fgetc(_fd);
268 if ((byte & 0xff) == MIDI_CMD_COMMON_SYSEX_END) {
273 success = fsetpos(_fd, &after_sysex_status_byte_position);
274 assert(success == 0);
281 // Make sure we have enough scratch buffer
282 if (*size < (unsigned)event_size)
283 *buf = (uint8_t*)realloc(*buf, event_size);
287 (*buf)[0] = (unsigned char)status;
289 fread((*buf) + 1, 1, *size - 1, _fd);
291 printf("SMF read event: delta = %u, size = %u, data = ", *delta_t, *size);
292 for (size_t i=0; i < *size; ++i) {
293 printf("%X ", (*buf)[i]);
302 SMF<T>::append_event_unlocked(uint32_t delta_t, const Event<T>& ev)
307 const size_t stamp_size = write_var_len(delta_t);
308 fwrite(ev.buffer(), 1, ev.size(), _fd);
310 _track_size += stamp_size + ev.size();
311 _last_ev_time = ev.time();
319 SMF<T>::begin_write(FrameTime start_frame)
322 fseek(_fd, _header_size, SEEK_SET);
335 SMF<T>::write_chunk_header(const char id[4], uint32_t length)
337 const uint32_t length_be = GUINT32_TO_BE(length);
339 fwrite(id, 1, 4, _fd);
340 fwrite(&length_be, 4, 1, _fd);
345 SMF<T>::write_chunk(const char id[4], uint32_t length, void* data)
347 write_chunk_header(id, length);
349 fwrite(data, 1, length, _fd);
352 /** Returns the size (in bytes) of the value written. */
355 SMF<T>::write_var_len(uint32_t value)
359 uint32_t buffer = value & 0x7F;
361 while ( (value >>= 7) ) {
363 buffer |= ((value & 0x7F) | 0x80);
367 //printf("Writing var len byte %X\n", (unsigned char)buffer);
379 template class SMF<double>;
381 } // namespace Evoral