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Providing hmp2mid code, which was previously forgotten when introducing sdl_mixer in r264

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md2211 2006-11-13 20:23:44 +00:00
parent 452ae2d800
commit 2b2c6b283d
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include/hmp2mid.h Normal file
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/* hmp 2 midi file conversion. The conversion algorithm is based on the
conversion algorithms found in d1x, d2x-xl and jjffe. The code is mine.
Copyright 2006 Hans de Goede
This file and the acompanying hmp2mid.c file are free software;
you can redistribute them and/or modify them under the terms of the GNU
Library General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.
These files are distributed in the hope that they will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with these files; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef __HMP2MID_H
#define __HMP2MID_H
#include <stdio.h>
typedef size_t (*hmp2mid_read_func_t)(void *ptr, size_t size, size_t nmemb,
void *stream);
/* Returns NULL on success, otherwise a c-string with an error message */
const char *hmp2mid(hmp2mid_read_func_t read_func, void *hmp_in, FILE* mid_out);
#endif

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misc/hmp2mid.c Normal file
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/* hmp 2 midi file conversion. The conversion algorithm is based on the
conversion algorithms found in d1x, d2x-xl and jjffe. The code is mine.
Copyright 2006 Hans de Goede
This file and the acompanying hmp2mid.h file are free software;
you can redistribute them and/or modify them under the terms of the GNU
Library General Public License as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later version.
These files are distributed in the hope that they will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with these files; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "hmp2mid.h"
/* Some convience macros to keep the code below more readable */
#define HMP_READ(buf, count) \
{\
if (read_func(buf, 1, count, hmp_in) != (count)) \
{ \
free(mid_track_buf); \
return hmp_read_error; \
} \
/* notice that when we are not actually in the track reading code this \
is bogus, but does no harm. And in the track code it helps :) */ \
track_length -= count; \
}
#define HMP_READ_DWORD(dest) \
{ \
unsigned char _buf[4]; \
HMP_READ(_buf, 4); \
*(dest) = (_buf[3] << 24) | (_buf[2] << 16) | (_buf[1] << 8) | _buf[0]; \
}
#define MID_WRITE(buf, count) \
if (fwrite(buf, 1, count, mid_out) != (count)) \
{ \
free(mid_track_buf); \
snprintf(hmp2mid_error, sizeof(hmp2mid_error), mid_write_error_templ, \
strerror(errno)); \
return hmp2mid_error; \
}
#define MID_TRACK_BUF(buf, count) \
{ \
if ((mid_track_buf_used + count) > mid_track_buf_size) \
{ \
void *tmp = mid_track_buf; \
mid_track_buf = realloc(mid_track_buf, mid_track_buf_size + 65536); \
if (!mid_track_buf) \
{ \
free(tmp); \
return "Error could not allocate midi track memory"; \
} \
} \
memcpy(mid_track_buf + mid_track_buf_used, buf, count); \
mid_track_buf_used += count; \
}
static const char *hmp_read_error = "Error reading from hmp file";
static const char *mid_write_error_templ = "Error writing to mid file: %s";
static char hmp2mid_error[512];
/* The beginning of the midi header */
static const char midi_header1[10] = { 'M', 'T', 'h', 'd', 0, 0, 0, 6, 0, 1 };
/* The last 2 bytes of the midi header and track0 */
static const char midi_header2[21] = { 0, 0xC0, 'M', 'T', 'r', 'k', 0, 0, 0,
0x0B, 0, 0xFF, 0x51, 0x03, 0x18, 0x80, 0, 0, 0xFF, 0x2F, 0 };
const char *hmp2mid(hmp2mid_read_func_t read_func, void *hmp_in, FILE* mid_out)
{
unsigned char last_com = 0, buf[0x300];
unsigned int num_tracks, track_length = 0, i, t;
unsigned char *mid_track_buf = NULL;
int n1, n2, mid_track_buf_used, mid_track_buf_size = 0;
/* Read the header and verify that this is a hmp file */
HMP_READ(buf, 8);
buf[8] = 0;
if (strcmp((char *)buf, "HMIMIDIP"))
return "Error not a hmp file";
/* Discard the next 0x28 bytes, taking us to location 0x30 and read the
number of tracks there */
HMP_READ(buf, 0x30 - 8);
HMP_READ_DWORD(&num_tracks);
/* Discard bytes taking us to location 0x300 around which track 1 starts */
HMP_READ(buf, 0x300 - 0x34);
/* Now search for the end of track marker of track 0 */
HMP_READ(buf, 3);
while ((buf[0] != 0xFF) || (buf[1] != 0x2F) || (buf[2] != 0x00))
{
buf[0] = buf[1];
buf[1] = buf[2];
HMP_READ(buf + 2, 1);
}
/* Sofar so good, write out the midi header */
MID_WRITE(midi_header1, sizeof(midi_header1));
/* number of tracks is a 16 bit MSB word, better not have more then 65535
tracks :) */
buf[0] = (num_tracks >> 8) & 0xFF;
buf[1] = num_tracks & 0xFF;
MID_WRITE(buf, 2);
/* Write the last word of the header and track0 */
MID_WRITE(midi_header2, sizeof(midi_header2));
/* Read and convert all the tracks */
for (i = 1; i < num_tracks; i++)
{
/* Read and verify hmp track number */
HMP_READ_DWORD(&t);
if (t != i)
{
free(mid_track_buf);
return "Error invalid hmp track number";
}
/* Read number of bytes in this track */
HMP_READ_DWORD(&track_length);
/* Above we've already read the first 8 bytes of this track, adjust
track_lenght accordingly. */
track_length -= 8;
/* Read and skip the next 4 unidentified header bytes */
HMP_READ(buf, 4);
/* Sofar so good write midi track header */
MID_WRITE("MTrk", 4);
/* Now we need to write the track length, but we don't know that yet, so
the track gets written to a dynamicly growing buffer (which is hidden
in the MID_TRACK_BUF macro) */
mid_track_buf_used = 0;
/* And finally start the real conversion */
while (track_length > 0)
{
n1 = -1; /* -1 to "counter" the intital n1++ */
do
{
n1++;
HMP_READ(buf + n1, 1);
} while (!(buf[n1] & 0x80));
if (n1 >= 4)
{
free(mid_track_buf);
return "Error parsing hmp track";
}
for (n2 = 0; n2 <= n1; n2++)
{
unsigned char u = buf[n1-n2] & 0x7F;
if (n2 != n1)
u |= 0x80;
MID_TRACK_BUF(&u, 1);
}
HMP_READ(buf, 1);
if (buf[0] == 0xFF) /* meta? */
{
HMP_READ(buf + 1, 2);
HMP_READ(buf + 3, buf[2]);
MID_TRACK_BUF(buf, 3 + buf[2]);
if (buf[1] == 0x2F) /* end of track? */
{
if (buf[2] != 0x00)
{
free(mid_track_buf);
return "Error hmp meta end of track with non zero size";
}
break;
}
else
continue;
}
switch (buf[0] & 0xF0)
{
case 0x80:
case 0x90:
case 0xA0:
case 0xB0:
case 0xE0:
t = 2;
break;
case 0xC0:
case 0xD0:
t = 1;
break;
default:
free(mid_track_buf);
return "Error invalid hmp command";
}
if (buf[0] != last_com)
MID_TRACK_BUF(buf, 1);
HMP_READ(buf + 1, t);
MID_TRACK_BUF(buf + 1, t);
last_com = buf[0];
}
if (track_length != 0)
{
free(mid_track_buf);
return "Error invalid track length";
}
/* write the midi track length */
buf [0] = mid_track_buf_used >> 24;
buf [1] = (mid_track_buf_used >> 16) & 0xFF;
buf [2] = (mid_track_buf_used >> 8) & 0xFF;
buf [3] = mid_track_buf_used & 0xFF;
MID_WRITE(buf, 4);
/* and the track itself */
MID_WRITE(mid_track_buf, mid_track_buf_used);
}
free (mid_track_buf);
return NULL;
}