647 lines
17 KiB
C
647 lines
17 KiB
C
/*-
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* Copyright (c) 2007, 2008 Edward Tomasz Napierała <trasz@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* ALTHOUGH THIS SOFTWARE IS MADE OF WIN AND SCIENCE, IT IS PROVIDED BY THE
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* AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**
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* \file
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*
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* Event decoding routines.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <math.h>
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#include <errno.h>
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#ifdef PLATFORM_WINDOWS
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#include <winsock2.h>
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#else
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#include <arpa/inet.h>
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#endif
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#include <stdint.h>
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#include "smf.h"
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#include "smf_private.h"
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#define BUFFER_SIZE 1024
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/**
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* \return Nonzero if event is metaevent. You should never send metaevents;
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* they are not really MIDI messages. They carry information like track title,
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* time signature etc.
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*/
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int
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smf_event_is_metadata(const smf_event_t *event)
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{
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assert(event->midi_buffer);
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assert(event->midi_buffer_length > 0);
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if (event->midi_buffer[0] == 0xFF)
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return (1);
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return (0);
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}
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/**
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* \return Nonzero if event is System Realtime.
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*/
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int
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smf_event_is_system_realtime(const smf_event_t *event)
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{
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assert(event->midi_buffer);
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assert(event->midi_buffer_length > 0);
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if (smf_event_is_metadata(event))
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return (0);
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if (event->midi_buffer[0] >= 0xF8)
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return (1);
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return (0);
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}
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/**
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* \return Nonzero if event is System Common.
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*/
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int
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smf_event_is_system_common(const smf_event_t *event)
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{
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assert(event->midi_buffer);
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assert(event->midi_buffer_length > 0);
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if (event->midi_buffer[0] >= 0xF0 && event->midi_buffer[0] <= 0xF7)
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return (1);
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return (0);
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}
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/**
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* \return Nonzero if event is SysEx message.
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*/
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int
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smf_event_is_sysex(const smf_event_t *event)
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{
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assert(event->midi_buffer);
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assert(event->midi_buffer_length > 0);
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if (event->midi_buffer[0] == 0xF0)
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return (1);
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return (0);
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}
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static char *
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smf_event_decode_textual(const smf_event_t *event, const char *name)
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{
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int off = 0;
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char *buf, *extracted;
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buf = (char*)malloc(BUFFER_SIZE);
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if (buf == NULL) {
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g_warning("smf_event_decode_textual: malloc failed.");
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return (NULL);
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}
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extracted = smf_event_extract_text(event);
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if (extracted == NULL) {
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free(buf);
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return (NULL);
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}
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snprintf(buf + off, BUFFER_SIZE - off, "%s: %s", name, extracted);
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return (buf);
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}
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static char *
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smf_event_decode_metadata(const smf_event_t *event)
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{
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int off = 0, mspqn, flats, isminor;
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char *buf;
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static const char *const major_keys[] = {"Fb", "Cb", "Gb", "Db", "Ab",
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"Eb", "Bb", "F", "C", "G", "D", "A", "E", "B", "F#", "C#", "G#"};
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static const char *const minor_keys[] = {"Dbm", "Abm", "Ebm", "Bbm", "Fm",
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"Cm", "Gm", "Dm", "Am", "Em", "Bm", "F#m", "C#m", "G#m", "D#m", "A#m", "E#m"};
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assert(smf_event_is_metadata(event));
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switch (event->midi_buffer[1]) {
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case 0x01:
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return (smf_event_decode_textual(event, "Text"));
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case 0x02:
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return (smf_event_decode_textual(event, "Copyright"));
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case 0x03:
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return (smf_event_decode_textual(event, "Sequence/Track Name"));
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case 0x04:
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return (smf_event_decode_textual(event, "Instrument"));
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case 0x05:
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return (smf_event_decode_textual(event, "Lyric"));
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case 0x06:
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return (smf_event_decode_textual(event, "Marker"));
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case 0x07:
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return (smf_event_decode_textual(event, "Cue Point"));
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case 0x08:
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return (smf_event_decode_textual(event, "Program Name"));
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case 0x09:
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return (smf_event_decode_textual(event, "Device (Port) Name"));
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default:
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break;
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}
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buf = (char*)malloc(BUFFER_SIZE);
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if (buf == NULL) {
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g_warning("smf_event_decode_metadata: malloc failed.");
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return (NULL);
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}
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switch (event->midi_buffer[1]) {
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case 0x00:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Sequence number");
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break;
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/* http://music.columbia.edu/pipermail/music-dsp/2004-August/061196.html */
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case 0x20:
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if (event->midi_buffer_length < 4) {
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g_warning("smf_event_decode_metadata: truncated MIDI message.");
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goto error;
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}
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off += snprintf(buf + off, BUFFER_SIZE - off, "Channel Prefix: %d", event->midi_buffer[3]);
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break;
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case 0x21:
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if (event->midi_buffer_length < 4) {
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g_warning("smf_event_decode_metadata: truncated MIDI message.");
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goto error;
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}
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off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Port: %d", event->midi_buffer[3]);
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break;
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case 0x2F:
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off += snprintf(buf + off, BUFFER_SIZE - off, "End Of Track");
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break;
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case 0x51:
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if (event->midi_buffer_length < 6) {
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g_warning("smf_event_decode_metadata: truncated MIDI message.");
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goto error;
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}
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mspqn = (event->midi_buffer[3] << 16) + (event->midi_buffer[4] << 8) + event->midi_buffer[5];
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off += snprintf(buf + off, BUFFER_SIZE - off, "Tempo: %d microseconds per quarter note, %.2f BPM",
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mspqn, 60000000.0 / (double)mspqn);
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break;
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case 0x54:
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off += snprintf(buf + off, BUFFER_SIZE - off, "SMPTE Offset");
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break;
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case 0x58:
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if (event->midi_buffer_length < 7) {
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g_warning("smf_event_decode_metadata: truncated MIDI message.");
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goto error;
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}
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off += snprintf(buf + off, BUFFER_SIZE - off,
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"Time Signature: %d/%d, %d clocks per click, %d notated 32nd notes per quarter note",
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event->midi_buffer[3], (int)pow((double)2, event->midi_buffer[4]), event->midi_buffer[5],
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event->midi_buffer[6]);
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break;
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case 0x59:
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if (event->midi_buffer_length < 5) {
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g_warning("smf_event_decode_metadata: truncated MIDI message.");
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goto error;
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}
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flats = event->midi_buffer[3];
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isminor = event->midi_buffer[4];
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if (isminor != 0 && isminor != 1) {
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g_warning("smf_event_decode_metadata: last byte of the Key Signature event has invalid value %d.", isminor);
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goto error;
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}
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off += snprintf(buf + off, BUFFER_SIZE - off, "Key Signature: ");
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if (flats > 8 && flats < 248) {
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off += snprintf(buf + off, BUFFER_SIZE - off, "%d %s, %s key", abs((int8_t)flats),
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flats > 127 ? "flats" : "sharps", isminor ? "minor" : "major");
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} else {
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int i = (flats - 248) & 255;
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assert(i >= 0 && (size_t)i < sizeof(minor_keys) / sizeof(*minor_keys));
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assert(i >= 0 && (size_t)i < sizeof(major_keys) / sizeof(*major_keys));
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if (isminor)
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off += snprintf(buf + off, BUFFER_SIZE - off, "%s", minor_keys[i]);
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else
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off += snprintf(buf + off, BUFFER_SIZE - off, "%s", major_keys[i]);
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}
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break;
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case 0x7F:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Proprietary (aka Sequencer) Event, length %" G_GSIZE_FORMAT,
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event->midi_buffer_length);
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break;
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default:
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goto error;
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}
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assert (off <= BUFFER_SIZE);
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return (buf);
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error:
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free(buf);
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return (NULL);
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}
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static char *
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smf_event_decode_system_realtime(const smf_event_t *event)
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{
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int off = 0;
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char *buf;
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assert(smf_event_is_system_realtime(event));
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if (event->midi_buffer_length != 1) {
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g_warning("smf_event_decode_system_realtime: event length is not 1.");
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return (NULL);
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}
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buf = (char*)malloc(BUFFER_SIZE);
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if (buf == NULL) {
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g_warning("smf_event_decode_system_realtime: malloc failed.");
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return (NULL);
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}
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switch (event->midi_buffer[0]) {
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case 0xF8:
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off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Clock (realtime)");
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break;
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case 0xF9:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Tick (realtime)");
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break;
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case 0xFA:
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off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Start (realtime)");
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break;
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case 0xFB:
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off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Continue (realtime)");
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break;
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case 0xFC:
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off += snprintf(buf + off, BUFFER_SIZE - off, "MIDI Stop (realtime)");
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break;
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case 0xFE:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Active Sense (realtime)");
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break;
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default:
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free(buf);
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return (NULL);
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}
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assert (off <= BUFFER_SIZE);
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return (buf);
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}
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static char *
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smf_event_decode_sysex(const smf_event_t *event)
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{
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int off = 0;
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char *buf, manufacturer, subid, subid2;
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assert(smf_event_is_sysex(event));
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if (event->midi_buffer_length < 5) {
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g_warning("smf_event_decode_sysex: truncated MIDI message.");
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return (NULL);
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}
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buf = (char*)malloc(BUFFER_SIZE);
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if (buf == NULL) {
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g_warning("smf_event_decode_sysex: malloc failed.");
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return (NULL);
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}
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manufacturer = event->midi_buffer[1];
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if (manufacturer == 0x7F) {
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off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, realtime, channel %d", event->midi_buffer[2]);
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} else if (manufacturer == 0x7E) {
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off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, non-realtime, channel %d", event->midi_buffer[2]);
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} else {
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off += snprintf(buf + off, BUFFER_SIZE - off, "SysEx, manufacturer 0x%x", manufacturer);
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assert (off <= BUFFER_SIZE);
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return (buf);
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}
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subid = event->midi_buffer[3];
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subid2 = event->midi_buffer[4];
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if (subid == 0x01)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Header");
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else if (subid == 0x02)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Data Packet");
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else if (subid == 0x03)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Request");
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else if (subid == 0x04 && subid2 == 0x01)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Master Volume");
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else if (subid == 0x05 && subid2 == 0x01)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Loop Point Retransmit");
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else if (subid == 0x05 && subid2 == 0x02)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Loop Point Request");
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else if (subid == 0x06 && subid2 == 0x01)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Identity Request");
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else if (subid == 0x06 && subid2 == 0x02)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Identity Reply");
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else if (subid == 0x08 && subid2 == 0x00)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump Request");
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else if (subid == 0x08 && subid2 == 0x01)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump");
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else if (subid == 0x08 && subid2 == 0x02)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Single Note Tuning Change");
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else if (subid == 0x08 && subid2 == 0x03)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Bulk Tuning Dump Request (Bank)");
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else if (subid == 0x08 && subid2 == 0x04)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Key Based Tuning Dump");
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else if (subid == 0x08 && subid2 == 0x05)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Scale/Octave Tuning Dump, 1 byte format");
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else if (subid == 0x08 && subid2 == 0x06)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Scale/Octave Tuning Dump, 2 byte format");
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else if (subid == 0x08 && subid2 == 0x07)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Single Note Tuning Change (Bank)");
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else if (subid == 0x09)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", General MIDI %s", subid2 == 0 ? "disable" : "enable");
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else if (subid == 0x7C)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Wait");
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else if (subid == 0x7D)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump Cancel");
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else if (subid == 0x7E)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump NAK");
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else if (subid == 0x7F)
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Sample Dump ACK");
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else
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off += snprintf(buf + off, BUFFER_SIZE - off, ", Unknown");
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assert (off <= BUFFER_SIZE);
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return (buf);
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}
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static char *
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smf_event_decode_system_common(const smf_event_t *event)
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{
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int off = 0;
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char *buf;
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assert(smf_event_is_system_common(event));
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if (smf_event_is_sysex(event))
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return (smf_event_decode_sysex(event));
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buf = (char*)malloc(BUFFER_SIZE);
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if (buf == NULL) {
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g_warning("smf_event_decode_system_realtime: malloc failed.");
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return (NULL);
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}
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switch (event->midi_buffer[0]) {
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case 0xF1:
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off += snprintf(buf + off, BUFFER_SIZE - off, "MTC Quarter Frame");
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break;
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case 0xF2:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Song Position Pointer");
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break;
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case 0xF3:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Song Select");
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break;
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case 0xF6:
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off += snprintf(buf + off, BUFFER_SIZE - off, "Tune Request");
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break;
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default:
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free(buf);
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return (NULL);
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}
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assert (off <= BUFFER_SIZE);
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return (buf);
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}
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static void
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note_from_int(char *buf, int note_number)
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{
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int note, octave;
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const char *names[] = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};
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octave = note_number / 12 - 1;
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note = note_number % 12;
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sprintf(buf, "%s%d", names[note], octave);
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}
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/**
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* \return Textual representation of the event given, or NULL, if event is unknown.
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|
* 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);
|
|
}
|
|
|