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livetrax/libs/evoral/src/libsmf/smf_decode.c
David Robillard 8249cfb6a7 Fix types to be warning clean on 64 bit. 
git-svn-id: svn://localhost/ardour2/branches/3.0@4560 d708f5d6-7413-0410-9779-e7cbd77b26cf
2009-02-14 22:22:55 +00:00

635 lines
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/*-
* Copyright (c) 2007, 2008 Edward Tomasz Napierała <trasz@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* ALTHOUGH THIS SOFTWARE IS MADE OF WIN AND SCIENCE, IT IS PROVIDED BY THE
* AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* \file
*
* Event decoding routines.
*
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <errno.h>
#include <arpa/inet.h>
#include <stdint.h>
#include "smf.h"
#include "smf_private.h"
#define BUFFER_SIZE 1024
/**
* \return Nonzero if event is metaevent. You should never send metaevents;
* they are not really MIDI messages. They carry information like track title,
* time signature etc.
*/
int
smf_event_is_metadata(const smf_event_t *event)
{
assert(event->midi_buffer);
assert(event->midi_buffer_length > 0);
if (event->midi_buffer[0] == 0xFF)
return (1);
return (0);
}
/**
* \return Nonzero if event is System Realtime.
*/
int
smf_event_is_system_realtime(const smf_event_t *event)
{
assert(event->midi_buffer);
assert(event->midi_buffer_length > 0);
if (smf_event_is_metadata(event))
return (0);
if (event->midi_buffer[0] >= 0xF8)
return (1);
return (0);
}
/**
* \return Nonzero if event is System Common.
*/
int
smf_event_is_system_common(const smf_event_t *event)
{
assert(event->midi_buffer);
assert(event->midi_buffer_length > 0);
if (event->midi_buffer[0] >= 0xF0 && event->midi_buffer[0] <= 0xF7)
return (1);
return (0);
}
/**
* \return Nonzero if event is SysEx message.
*/
int
smf_event_is_sysex(const smf_event_t *event)
{
assert(event->midi_buffer);
assert(event->midi_buffer_length > 0);
if (event->midi_buffer[0] == 0xF0)
return (1);
return (0);
}
static char *
smf_event_decode_textual(const smf_event_t *event, const char *name)
{
int off = 0;
char *buf, *extracted;
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_textual: malloc failed.");
return (NULL);
}
extracted = smf_event_extract_text(event);
if (extracted == NULL) {
free(buf);
return (NULL);
}
snprintf(buf + off, BUFFER_SIZE - off, "%s: %s", name, extracted);
return (buf);
}
static char *
smf_event_decode_metadata(const smf_event_t *event)
{
int off = 0, mspqn, flats, isminor;
char *buf;
static const char *const major_keys[] = {"Fb", "Cb", "Gb", "Db", "Ab",
"Eb", "Bb", "F", "C", "G", "D", "A", "E", "B", "F#", "C#", "G#"};
static const char *const minor_keys[] = {"Dbm", "Abm", "Ebm", "Bbm", "Fm",
"Cm", "Gm", "Dm", "Am", "Em", "Bm", "F#m", "C#m", "G#m", "D#m", "A#m", "E#m"};
assert(smf_event_is_metadata(event));
switch (event->midi_buffer[1]) {
case 0x01:
return (smf_event_decode_textual(event, "Text"));
case 0x02:
return (smf_event_decode_textual(event, "Copyright"));
case 0x03:
return (smf_event_decode_textual(event, "Sequence/Track Name"));
case 0x04:
return (smf_event_decode_textual(event, "Instrument"));
case 0x05:
return (smf_event_decode_textual(event, "Lyric"));
case 0x06:
return (smf_event_decode_textual(event, "Marker"));
case 0x07:
return (smf_event_decode_textual(event, "Cue Point"));
case 0x08:
return (smf_event_decode_textual(event, "Program Name"));
case 0x09:
return (smf_event_decode_textual(event, "Device (Port) Name"));
default:
break;
}
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_metadata: malloc failed.");
return (NULL);
}
switch (event->midi_buffer[1]) {
case 0x00:
off += snprintf(buf + off, BUFFER_SIZE - off, "Sequence number");
break;
/* http://music.columbia.edu/pipermail/music-dsp/2004-August/061196.html */
case 0x20:
if (event->midi_buffer_length < 4) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "Channel Prefix: %d", event->midi_buffer[3]);
break;
case 0x21:
if (event->midi_buffer_length < 4) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Port: %d", event->midi_buffer[3]);
break;
case 0x2F:
off += snprintf(buf + off, BUFFER_SIZE - off, "End Of Track");
break;
case 0x51:
if (event->midi_buffer_length < 6) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
mspqn = (event->midi_buffer[3] << 16) + (event->midi_buffer[4] << 8) + event->midi_buffer[5];
off += snprintf(buf + off, BUFFER_SIZE - off, "Tempo: %d microseconds per quarter note, %.2f BPM",
mspqn, 60000000.0 / (double)mspqn);
break;
case 0x54:
off += snprintf(buf + off, BUFFER_SIZE - off, "SMPTE Offset");
break;
case 0x58:
if (event->midi_buffer_length < 7) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off,
"Time Signature: %d/%d, %d clocks per click, %d notated 32nd notes per quarter note",
event->midi_buffer[3], (int)pow(2, event->midi_buffer[4]), event->midi_buffer[5],
event->midi_buffer[6]);
break;
case 0x59:
if (event->midi_buffer_length < 5) {
g_critical("smf_event_decode_metadata: truncated MIDI message.");
goto error;
}
flats = event->midi_buffer[3];
isminor = event->midi_buffer[4];
if (isminor != 0 && isminor != 1) {
g_critical("smf_event_decode_metadata: last byte of the Key Signature event has invalid value %d.", isminor);
goto error;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "Key Signature: ");
if (flats > 8 && flats < 248) {
off += snprintf(buf + off, BUFFER_SIZE - off, "%d %s, %s key", abs((int8_t)flats),
flats > 127 ? "flats" : "sharps", isminor ? "minor" : "major");
} else {
int i = (flats - 248) & 255;
assert(i >= 0 && (size_t)i < sizeof(minor_keys) / sizeof(*minor_keys));
assert(i >= 0 && (size_t)i < sizeof(major_keys) / sizeof(*major_keys));
if (isminor)
off += snprintf(buf + off, BUFFER_SIZE - off, "%s", minor_keys[i]);
else
off += snprintf(buf + off, BUFFER_SIZE - off, "%s", major_keys[i]);
}
break;
case 0x7F:
off += snprintf(buf + off, BUFFER_SIZE - off, "Proprietary (aka Sequencer) Event, length %zu",
event->midi_buffer_length);
break;
default:
goto error;
}
return (buf);
error:
free(buf);
return (NULL);
}
static char *
smf_event_decode_system_realtime(const smf_event_t *event)
{
int off = 0;
char *buf;
assert(smf_event_is_system_realtime(event));
if (event->midi_buffer_length != 1) {
g_critical("smf_event_decode_system_realtime: event length is not 1.");
return (NULL);
}
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_system_realtime: malloc failed.");
return (NULL);
}
switch (event->midi_buffer[0]) {
case 0xF8:
off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Clock (realtime)");
break;
case 0xF9:
off += snprintf(buf + off, BUFFER_SIZE - off, "Tick (realtime)");
break;
case 0xFA:
off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Start (realtime)");
break;
case 0xFB:
off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Continue (realtime)");
break;
case 0xFC:
off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Stop (realtime)");
break;
case 0xFE:
off += snprintf(buf + off, BUFFER_SIZE - off, "Active Sense (realtime)");
break;
default:
free(buf);
return (NULL);
}
return (buf);
}
static char *
smf_event_decode_sysex(const smf_event_t *event)
{
int off = 0;
char *buf, manufacturer, subid, subid2;
assert(smf_event_is_sysex(event));
if (event->midi_buffer_length < 5) {
g_critical("smf_event_decode_sysex: truncated MIDI message.");
return (NULL);
}
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_sysex: malloc failed.");
return (NULL);
}
manufacturer = event->midi_buffer[1];
if (manufacturer == 0x7F) {
off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, realtime, channel %d", event->midi_buffer[2]);
} else if (manufacturer == 0x7E) {
off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, non-realtime, channel %d", event->midi_buffer[2]);
} else {
off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, manufacturer 0x%x", manufacturer);
return (buf);
}
subid = event->midi_buffer[3];
subid2 = event->midi_buffer[4];
if (subid == 0x01)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Header");
else if (subid == 0x02)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Data Packet");
else if (subid == 0x03)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Request");
else if (subid == 0x04 && subid2 == 0x01)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Master Volume");
else if (subid == 0x05 && subid2 == 0x01)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Loop Point Retransmit");
else if (subid == 0x05 && subid2 == 0x02)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Loop Point Request");
else if (subid == 0x06 && subid2 == 0x01)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Identity Request");
else if (subid == 0x06 && subid2 == 0x02)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Identity Reply");
else if (subid == 0x08 && subid2 == 0x00)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump Request");
else if (subid == 0x08 && subid2 == 0x01)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump");
else if (subid == 0x08 && subid2 == 0x02)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Single Note Tuning Change");
else if (subid == 0x08 && subid2 == 0x03)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump Request (Bank)");
else if (subid == 0x08 && subid2 == 0x04)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Key Based Tuning Dump");
else if (subid == 0x08 && subid2 == 0x05)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Scale/Octave Tuning Dump, 1 byte format");
else if (subid == 0x08 && subid2 == 0x06)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Scale/Octave Tuning Dump, 2 byte format");
else if (subid == 0x08 && subid2 == 0x07)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Single Note Tuning Change (Bank)");
else if (subid == 0x09)
off += snprintf(buf + off, BUFFER_SIZE - off, ", General MIDI %s", subid2 == 0 ? "disable" : "enable");
else if (subid == 0x7C)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Wait");
else if (subid == 0x7D)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Cancel");
else if (subid == 0x7E)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump NAK");
else if (subid == 0x7F)
off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump ACK");
else
off += snprintf(buf + off, BUFFER_SIZE - off, ", Unknown");
return (buf);
}
static char *
smf_event_decode_system_common(const smf_event_t *event)
{
int off = 0;
char *buf;
assert(smf_event_is_system_common(event));
if (smf_event_is_sysex(event))
return (smf_event_decode_sysex(event));
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode_system_realtime: malloc failed.");
return (NULL);
}
switch (event->midi_buffer[0]) {
case 0xF1:
off += snprintf(buf + off, BUFFER_SIZE - off, "MTC Quarter Frame");
break;
case 0xF2:
off += snprintf(buf + off, BUFFER_SIZE - off, "Song Position Pointer");
break;
case 0xF3:
off += snprintf(buf + off, BUFFER_SIZE - off, "Song Select");
break;
case 0xF6:
off += snprintf(buf + off, BUFFER_SIZE - off, "Tune Request");
break;
default:
free(buf);
return (NULL);
}
return (buf);
}
static void
note_from_int(char *buf, int note_number)
{
int note, octave;
char *names[] = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};
octave = note_number / 12 - 1;
note = note_number % 12;
sprintf(buf, "%s%d", names[note], octave);
}
/**
* \return Textual representation of the event given, or NULL, if event is unknown.
* Returned string looks like this:
*
* Note On, channel 1, note F#3, velocity 0
*
* You should free the returned string afterwards, using free(3).
*/
char *
smf_event_decode(const smf_event_t *event)
{
int off = 0, channel;
char *buf, note[5];
if (smf_event_is_metadata(event))
return (smf_event_decode_metadata(event));
if (smf_event_is_system_realtime(event))
return (smf_event_decode_system_realtime(event));
if (smf_event_is_system_common(event))
return (smf_event_decode_system_common(event));
if (!smf_event_length_is_valid(event)) {
g_critical("smf_event_decode: incorrect MIDI message length.");
return (NULL);
}
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode: malloc failed.");
return (NULL);
}
/* + 1, because user-visible channels used to be in range <1-16>. */
channel = (event->midi_buffer[0] & 0x0F) + 1;
switch (event->midi_buffer[0] & 0xF0) {
case 0x80:
note_from_int(note, event->midi_buffer[1]);
off += snprintf(buf + off, BUFFER_SIZE - off, "Note Off, channel %d, note %s, velocity %d",
channel, note, event->midi_buffer[2]);
break;
case 0x90:
note_from_int(note, event->midi_buffer[1]);
off += snprintf(buf + off, BUFFER_SIZE - off, "Note On, channel %d, note %s, velocity %d",
channel, note, event->midi_buffer[2]);
break;
case 0xA0:
note_from_int(note, event->midi_buffer[1]);
off += snprintf(buf + off, BUFFER_SIZE - off, "Aftertouch, channel %d, note %s, pressure %d",
channel, note, event->midi_buffer[2]);
break;
case 0xB0:
off += snprintf(buf + off, BUFFER_SIZE - off, "Controller, channel %d, controller %d, value %d",
channel, event->midi_buffer[1], event->midi_buffer[2]);
break;
case 0xC0:
off += snprintf(buf + off, BUFFER_SIZE - off, "Program Change, channel %d, controller %d",
channel, event->midi_buffer[1]);
break;
case 0xD0:
off += snprintf(buf + off, BUFFER_SIZE - off, "Channel Pressure, channel %d, pressure %d",
channel, event->midi_buffer[1]);
break;
case 0xE0:
off += snprintf(buf + off, BUFFER_SIZE - off, "Pitch Wheel, channel %d, value %d",
channel, ((int)event->midi_buffer[2] << 7) | (int)event->midi_buffer[2]);
break;
default:
free(buf);
return (NULL);
}
return (buf);
}
/**
* \return Textual representation of the data extracted from MThd header, or NULL, if something goes wrong.
* Returned string looks like this:
*
* format: 1 (several simultaneous tracks); number of tracks: 4; division: 192 PPQN.
*
* You should free the returned string afterwards, using free(3).
*/
char *
smf_decode(const smf_t *smf)
{
int off = 0;
char *buf;
buf = malloc(BUFFER_SIZE);
if (buf == NULL) {
g_critical("smf_event_decode: malloc failed.");
return (NULL);
}
off += snprintf(buf + off, BUFFER_SIZE - off, "format: %d ", smf->format);
switch (smf->format) {
case 0:
off += snprintf(buf + off, BUFFER_SIZE - off, "(single track)");
break;
case 1:
off += snprintf(buf + off, BUFFER_SIZE - off, "(several simultaneous tracks)");
break;
case 2:
off += snprintf(buf + off, BUFFER_SIZE - off, "(several independent tracks)");
break;
default:
off += snprintf(buf + off, BUFFER_SIZE - off, "(INVALID FORMAT)");
break;
}
off += snprintf(buf + off, BUFFER_SIZE - off, "; number of tracks: %d", smf->number_of_tracks);
if (smf->ppqn != 0)
off += snprintf(buf + off, BUFFER_SIZE - off, "; division: %d PPQN", smf->ppqn);
else
off += snprintf(buf + off, BUFFER_SIZE - off, "; division: %d FPS, %d resolution", smf->frames_per_second, smf->resolution);
return (buf);
}
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