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Diffstat (limited to 'libs/evoral/libsmf/smf_decode.c')
-rw-r--r--libs/evoral/libsmf/smf_decode.c646
1 files changed, 646 insertions, 0 deletions
diff --git a/libs/evoral/libsmf/smf_decode.c b/libs/evoral/libsmf/smf_decode.c
new file mode 100644
index 0000000000..4bd774f345
--- /dev/null
+++ b/libs/evoral/libsmf/smf_decode.c
@@ -0,0 +1,646 @@
+/*-
+ * 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>
+#ifdef PLATFORM_WINDOWS
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+#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 = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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 = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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_warning("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_warning("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_warning("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_warning("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((double)2, event->midi_buffer[4]), event->midi_buffer[5],
+ event->midi_buffer[6]);
+ break;
+
+ case 0x59:
+ if (event->midi_buffer_length < 5) {
+ g_warning("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_warning("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 %" G_GSIZE_FORMAT,
+ event->midi_buffer_length);
+ break;
+
+ default:
+ goto error;
+ }
+
+ assert (off <= BUFFER_SIZE);
+ 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_warning("smf_event_decode_system_realtime: event length is not 1.");
+ return (NULL);
+ }
+
+ buf = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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);
+ }
+
+ assert (off <= BUFFER_SIZE);
+ 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_warning("smf_event_decode_sysex: truncated MIDI message.");
+ return (NULL);
+ }
+
+ buf = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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);
+
+ assert (off <= BUFFER_SIZE);
+ 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");
+
+ assert (off <= BUFFER_SIZE);
+ 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 = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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);
+ }
+
+ assert (off <= BUFFER_SIZE);
+ return (buf);
+}
+
+static void
+note_from_int(char *buf, int note_number)
+{
+ int note, octave;
+ const 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_warning("smf_event_decode: incorrect MIDI message length.");
+ return (NULL);
+ }
+
+ buf = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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);
+ }
+
+ assert(off <= BUFFER_SIZE);
+
+ 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 = (char*)malloc(BUFFER_SIZE);
+ if (buf == NULL) {
+ g_warning("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);
+
+ assert (off <= BUFFER_SIZE);
+ return (buf);
+}
+
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