+++ /dev/null
-/*
- This file is part of LilyPond, the GNU music typesetter.
-
- Copyright (C) 2001--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- Jan Nieuwenhuizen <janneke@gnu.org>
-
-
- LilyPond is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- LilyPond is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/*
-
-python
-import midi
-s = open ("s.midi").read ()
-midi.parse_track (s)
-midi.parse (s)
-
-
-returns a MIDI file as the tuple
-
- ((format, division), TRACKLIST)
-
-each track is an EVENTLIST, where EVENT is
-
- (time, (type, ARG1, [ARG2]))
-
-*/
-
-#include <Python.h>
-
-char *
-compat_itoa (int i)
-{
- static char buffer[9];
- snprintf (buffer, 8, "%d", i);
- return buffer;
-}
-
-/* PyMIDINIT_FUNC isn't defined in Python < 2.3 */
-#ifndef PyMODINIT_FUNC
-# if defined(__cplusplus)
-# define PyMODINIT_FUNC extern "C" void
-# else /* __cplusplus */
-# define PyMODINIT_FUNC void
-# endif /* __cplusplus */
-#endif
-
-#if 0
-int x = 0;
-int *track = &x;
-#define urg_debug_print(f, args...) fprintf (stderr, "%s:%d: track: %p: " f, __FUNCTION__, __LINE__, *track, ##args)
-#define debug_print(f, args...) fprintf (stderr, f, ##args)
-#else
-#define debug_print(f, args...)
-#endif
-
-static PyObject *Midi_error;
-static PyObject *Midi_warning;
-
-static PyObject *
-midi_error (char const *func, char *s, char *t)
-{
- char *dest = (char*) malloc (sizeof (char)
- * (strlen (func) + strlen (s) + strlen (t) + 1));
- strcpy (dest, func);
- strcat (dest, s);
- strcat (dest, t);
- PyErr_SetString (Midi_error, dest);
- free (dest);
-
- return 0;
-}
-
-static PyObject *
-midi_warning (char const *s)
-{
- PyErr_SetString (Midi_warning, s);
- return 0;
-}
-
-
-typedef struct message {
- unsigned char msg;
- char * description;
-} message_t;
-
-message_t channelVoiceMessages[] = {
- {0x80, "NOTE_OFF"},
- {0x90, "NOTE_ON"},
- {0xA0, "POLYPHONIC_KEY_PRESSURE"},
- {0xB0, "CONTROLLER_CHANGE"},
- {0xC0, "PROGRAM_CHANGE"},
- {0xD0, "CHANNEL_KEY_PRESSURE"},
- {0xE0, "PITCH_BEND"},
- {0,0}
-};
-
-message_t channelModeMessages[] = {
- {0x78, "ALL_SOUND_OFF"},
- {0x79, "RESET_ALL_CONTROLLERS"},
- {0x7A, "LOCAL_CONTROL"},
- {0x7B, "ALL_NOTES_OFF"},
- {0x7C, "OMNI_MODE_OFF"},
- {0x7D, "OMNI_MODE_ON"},
- {0x7E, "MONO_MODE_ON"},
- {0x7F, "POLY_MODE_ON"},
- {0,0}
-};
-
-message_t metaEvents[] = {
- {0x00, "SEQUENCE_NUMBER"},
- {0x01, "TEXT_EVENT"},
- {0x02, "COPYRIGHT_NOTICE"},
- {0x03, "SEQUENCE_TRACK_NAME"},
- {0x04, "INSTRUMENT_NAME"},
- {0x05, "LYRIC"},
- {0x06, "MARKER"},
- {0x07, "CUE_POINT"},
- {0x20, "MIDI_CHANNEL_PREFIX"},
- {0x21, "MIDI_PORT"},
- {0x2F, "END_OF_TRACK"},
- {0x51, "SET_TEMPO"},
- {0x54, "SMTPE_OFFSET"},
- {0x58, "TIME_SIGNATURE"},
- {0x59, "KEY_SIGNATURE"},
- {0x7F, "SEQUENCER_SPECIFIC_META_EVENT"},
- {0xFF, "META_EVENT"},
- {0,0}
-};
-
-void
-add_constants (PyObject *dict)
-{
- message_t * p[] = {metaEvents, channelModeMessages, channelVoiceMessages ,0};
- int i,j;
- for ( j =0; p[j]; j++)
- for ( i = 0; p[j][i].description; i++)
- PyDict_SetItemString (dict, p[j][i].description, Py_BuildValue ("i", p[j][i].msg));
-}
-
-unsigned long int
-get_number (unsigned char ** str, unsigned char * end_str, int length)
-{
- /* # MIDI uses big-endian for everything */
- long sum = 0;
- int i = 0;
-
- for (; i < length &&
- ((*str) + i < end_str); i++)
- sum = (sum << 8) + (unsigned char) (*str)[i];
-
- *str += length;
- debug_print ("%ld:\n", sum);
- return sum;
-}
-
-unsigned long int
-get_variable_length_number (unsigned char **str, unsigned char * end_str)
-{
- long sum = 0;
-
- while (*str < end_str)
- {
- unsigned char x = **str;
- (*str) ++;
- sum = (sum << 7) + (x & 0x7F);
- if (!(x & 0x80))
- break;
- }
- debug_print ("%ld:\n", sum);
- return sum;
-}
-
-PyObject *
-read_one_byte (unsigned char **track, unsigned char *end,
- unsigned char x)
-{
- PyObject *pyev = Py_BuildValue ("(i)", x);
- debug_print ("%x:%s", x, "event\n");
-
- return pyev;
-}
-
-PyObject *
-read_two_bytes (unsigned char **track, unsigned char *end,
- unsigned char x)
-{
- PyObject *pyev = Py_BuildValue ("(ii)", x, (*track)[0]);
- *track += 1;
- debug_print ("%x:%s", x, "event\n");
- return pyev;
-}
-
-PyObject *
-read_three_bytes (unsigned char **track, unsigned char *end,
- unsigned char x)
-{
- PyObject *pyev = Py_BuildValue ("(iii)", x, (*track)[0],
- (*track)[1]);
-
- *track += 2;
- debug_print ("%x:%s", x, "event\n");
- return pyev;
-}
-
-PyObject *
-read_string (unsigned char **track, unsigned char *end)
-{
- unsigned long length = get_variable_length_number (track, end);
- if (length > end - *track)
- length = end - *track;
-
- *track += length;
- return Py_BuildValue ("s#", ((*track) -length), length);
-}
-
-typedef PyObject* (*Read_midi_event)
- (unsigned char **track, unsigned char *end,
- unsigned char x);
-
-
-static PyObject *
-read_f0_byte (unsigned char **track, unsigned char *end,
- unsigned char x)
-
-{
- debug_print ("%x:%s", x, "event\n");
- if (x == 0xff)
- {
- unsigned char z = (*track)[0 ];
- *track += 1;
- debug_print ("%x:%s", z, "f0-event\n");
-
- return Py_BuildValue ("(iiO)", x, z, read_string (track, end));
- }
-
- return Py_BuildValue ("(iO)", x, read_string (track, end));
-}
-
-Read_midi_event read_midi_event [16] =
-{
- read_one_byte, // 0
- read_one_byte, // 10
- read_one_byte, // 20
- read_one_byte, // 30
- read_one_byte, // 40
- read_one_byte, // 50
- read_one_byte, // 60 data entry.
- read_two_bytes, // 70 all notes off
- read_three_bytes, // 80 note off
- read_three_bytes, // 90 note on
- read_three_bytes, // a0 poly aftertouch
- read_three_bytes, // b0 control
- read_two_bytes, // c0 prog change
- read_two_bytes, // d0 ch aftertouch
- read_three_bytes, // e0 pitchwheel range
- read_f0_byte, // f0
-};
-
-
-static PyObject *
-read_event (unsigned char **track, unsigned char *end, PyObject *time,
- unsigned char *running_status)
-{
- int rsb_skip = ((**track & 0x80)) ? 1 :0;
-
- unsigned char x = (rsb_skip) ? (*track)[0]: *running_status;
-
- PyObject * bare_event = 0;
- debug_print ("%x:%s", x, "event\n");
- *running_status = x;
- *track += rsb_skip;
-
- // printf ("%x %x %d next %x\n", x, (*track)[0], rsb_skip, (*track)[1]);
- bare_event = (*read_midi_event[x >> 4]) (track, end, x);
- if (bare_event)
- return Py_BuildValue ("(OO)", time, bare_event);
- else
- return NULL;
-}
-
-static PyObject *
-midi_parse_track (unsigned char **track, unsigned char *track_end, int clocks_max)
-{
- unsigned int time = 0;
- unsigned long track_len, track_size;
- PyObject *pytrack = 0;
-
- debug_print ("%s", "\n");
-
- track_size = track_end - *track;
-
- debug_print ("%s", "\n");
- if (memcmp (*track, "MTrk", 4))
- {
- *track[4] = 0;
- return midi_error (__FUNCTION__, ": MTrk expected, got: ", *(char**)track);
- }
-
- *track += 4;
-
- track_len = get_number (track, *track + 4, 4);
-
- debug_print ("track_len: %lu\n", track_len);
- debug_print ("track_size: %lu\n", track_size);
- debug_print ("track begin: %p\n", track);
- debug_print ("track end: %p\n", track + track_len);
-
- if (track_len > track_size)
- return midi_error (__FUNCTION__, ": track length corrupt: ", compat_itoa (track_len));
-
- pytrack = PyList_New (0);
-
- if (*track + track_len < track_end)
- track_end = *track + track_len;
-
- {
- PyObject *pytime = PyInt_FromLong (0L);
- unsigned char running_status = 0;
-
- while (*track < track_end)
- {
- long dt = get_variable_length_number(track, track_end);
- PyObject *pyev = 0;
-
- time += dt;
- if (dt)
- pytime = PyInt_FromLong (time);
- if (clocks_max && time > clocks_max)
- break;
- pyev = read_event (track, track_end, pytime,
- &running_status);
- if (pyev)
- PyList_Append (pytrack, pyev);
- }
- }
-
- *track = track_end;
- return pytrack;
-}
-
-
-static PyObject *
-pymidi_parse_track (PyObject *self, PyObject *args)
-{
- unsigned char *track, *track_end;
- int track_size;
- int clocks_max;
-
- debug_print ("%s", "\n");
- if (!PyArg_ParseTuple (args, "s#|i", &track, &track_size, &clocks_max))
- return 0;
- debug_print ("clocks_max: %d\n", clocks_max);
-
- if (track_size < 0)
- return midi_error (__FUNCTION__, ": negative track size: ", compat_itoa (track_size));
-
- track_end = track + track_size;
-
- return midi_parse_track (&track, track_end, clocks_max);
-}
-
-static PyObject *
-midi_parse (unsigned char **midi,unsigned char *midi_end, int clocks_max)
-{
- PyObject *pymidi = 0;
- unsigned long header_len;
- unsigned format, tracks;
- int division;
- int i;
-
- debug_print ("%s", "\n");
-
- /* Header */
- header_len = get_number (midi, *midi + 4, 4);
-
- if (header_len < 6)
- return midi_error (__FUNCTION__, ": header too short: ", compat_itoa (header_len));
-
- format = get_number (midi, *midi + 2, 2);
- tracks = get_number (midi, *midi + 2, 2);
-
- if (tracks > 256)
- return midi_error (__FUNCTION__, ": too many tracks: ", compat_itoa (tracks));
-
- division = get_number (midi, *midi + 2, 2) * 4;
-
-
- /*
- if (division < 0)
- return midi_error (cannot handle non-metrical time");
- ;
- */
- *midi += header_len - 6;
-
- pymidi = PyList_New (0);
-
- /* Tracks */
- for (i = 0; i < tracks; i++)
- PyList_Append (pymidi, midi_parse_track (midi, midi_end, clocks_max));
-
- pymidi = Py_BuildValue ("(OO)", Py_BuildValue ("(ii)", format, division),
- pymidi);
- return pymidi;
-}
-
-static PyObject *
-pymidi_parse (PyObject *self, PyObject *args)
-{
- unsigned char *midi, *midi_end;
- unsigned long midi_size;
- int clocks_max;
-
- debug_print ("%s", "\n");
- if (!PyArg_ParseTuple (args, "s#|i", &midi, &midi_size, &clocks_max))
- return 0;
- debug_print ("clocks_max: %d\n", clocks_max);
-
- if (memcmp (midi, "MThd", 4))
- {
- midi[4] = 0;
- return midi_error (__FUNCTION__, ": MThd expected, got: ", (char*)midi);
- }
-
- midi += 4;
-
- midi_end = midi + midi_size;
-
- return midi_parse (&midi, midi_end, clocks_max);
-}
-
-static PyMethodDef MidiMethods[] =
-{
- {"parse", pymidi_parse, METH_VARARGS},
- {"parse_track", pymidi_parse_track, METH_VARARGS},
- {0, 0} /* Sentinel */
-};
-
-PyMODINIT_FUNC
-initmidi (void)
-{
- PyObject *m, *d;
- m = Py_InitModule ("midi", MidiMethods);
- d = PyModule_GetDict (m);
-
- Midi_error = PyString_FromString ("midi.error");
- PyDict_SetItemString (d, "error", Midi_error);
- add_constants (d);
- Midi_warning = PyString_FromString ("midi.warning");
- PyDict_SetItemString (d, "warning", Midi_warning);
-
- /*
- FIXME.
- */
- (void) midi_warning;
-}
-
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