ref: 292a32823ddb0b3667e6db878c755cf41893cc51
dir: /src/it/readasy.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readasy.c - Code to read an ASYLUM Music Format / / \ \
* module from an open file. | < / \_
* | \/ /\ /
* By Chris Moeller. \_ / > /
* | \ / /
* | ' /
* \__/
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "dumb.h"
#include "internal/it.h"
static int it_asy_read_pattern( IT_PATTERN *pattern, DUMBFILE *f, unsigned char *buffer )
{
int pos;
int channel;
int row;
IT_ENTRY *entry;
pattern->n_rows = 64;
if ( dumbfile_getnc( (char *) buffer, 64 * 8 * 4, f ) != 64 * 8 * 4 )
return -1;
/* compute number of entries */
pattern->n_entries = 64; /* Account for the row end markers */
pos = 0;
for ( row = 0; row < 64; ++row ) {
for ( channel = 0; channel < 8; ++channel ) {
if ( buffer[ pos + 0 ] | buffer[ pos + 1 ] | buffer[ pos + 2 ] | buffer[ pos + 3 ] )
++pattern->n_entries;
pos += 4;
}
}
pattern->entry = malloc( pattern->n_entries * sizeof( *pattern->entry ) );
if ( !pattern->entry )
return -1;
entry = pattern->entry;
pos = 0;
for ( row = 0; row < 64; ++row ) {
for ( channel = 0; channel < 8; ++channel ) {
if ( buffer[ pos + 0 ] | buffer[ pos + 1 ] | buffer[ pos + 2 ] | buffer[ pos + 3 ] ) {
entry->channel = channel;
entry->mask = 0;
if ( buffer[ pos + 0 ] && buffer[ pos + 0 ] < 96 ) {
entry->note = buffer[ pos + 0 ];
entry->mask |= IT_ENTRY_NOTE;
}
if ( buffer[ pos + 1 ] && buffer[ pos + 1 ] <= 64 ) {
entry->instrument = buffer[ pos + 1 ];
entry->mask |= IT_ENTRY_INSTRUMENT;
}
_dumb_it_xm_convert_effect( buffer[ pos + 2 ], buffer[ pos + 3 ], entry, 1 );
// fixup
switch ( entry->effect ) {
case IT_SET_PANNING:
entry->effectvalue <<= 1;
break;
}
if ( entry->mask ) ++entry;
}
pos += 4;
}
IT_SET_END_ROW( entry );
++entry;
}
pattern->n_entries = (int)(entry - pattern->entry);
return 0;
}
static int it_asy_read_sample_header( IT_SAMPLE *sample, DUMBFILE *f )
{
int finetune, key_offset;
/**
21 22 Chars Sample 1 name. If the name is not a full
22 chars in length, it will be null
terminated.
If
the sample name begins with a '#' character (ASCII $23 (35)) then this is
assumed not to be an instrument name, and is probably a message.
*/
dumbfile_getnc( (char *) sample->name, 22, f );
sample->name[22] = 0;
sample->filename[0] = 0;
/** Each finetune step changes the note 1/8th of a semitone. */
finetune = ( signed char ) ( dumbfile_getc( f ) << 4 ) >> 4; /* signed nibble */
sample->default_volume = dumbfile_getc( f ); // Should we be setting global_volume to this instead?
sample->global_volume = 64;
if ( sample->default_volume > 64 ) sample->default_volume = 64;
key_offset = ( signed char ) dumbfile_getc( f ); /* base key offset */
sample->length = dumbfile_igetl( f );
sample->loop_start = dumbfile_igetl( f );
sample->loop_end = sample->loop_start + dumbfile_igetl( f );
if ( sample->length <= 0 ) {
sample->flags = 0;
return 0;
}
sample->flags = IT_SAMPLE_EXISTS;
sample->default_pan = 0;
sample->C5_speed = (int)( AMIGA_CLOCK / 214.0 * pow( DUMB_SEMITONE_BASE, key_offset ) );//( long )( 16726.0 * pow( DUMB_PITCH_BASE, finetune * 32 ) );
sample->finetune = finetune * 32;
// the above line might be wrong
if ( ( sample->loop_end - sample->loop_start > 2 ) && ( sample->loop_end <= sample->length ) )
sample->flags |= IT_SAMPLE_LOOP;
sample->vibrato_speed = 0;
sample->vibrato_depth = 0;
sample->vibrato_rate = 0;
sample->vibrato_waveform = 0; // do we have to set _all_ these?
sample->max_resampling_quality = -1;
return dumbfile_error(f);
}
static int it_asy_read_sample_data( IT_SAMPLE *sample, DUMBFILE *f )
{
long truncated_size;
/* let's get rid of the sample data coming after the end of the loop */
if ( ( sample->flags & IT_SAMPLE_LOOP ) && sample->loop_end < sample->length ) {
truncated_size = sample->length - sample->loop_end;
sample->length = sample->loop_end;
} else {
truncated_size = 0;
}
sample->data = malloc( sample->length );
if ( !sample->data )
return -1;
if ( sample->length )
dumbfile_getnc( sample->data, sample->length, f );
dumbfile_skip( f, truncated_size );
return dumbfile_error( f );
}
static DUMB_IT_SIGDATA *it_asy_load_sigdata(DUMBFILE *f)
{
DUMB_IT_SIGDATA *sigdata;
int i;
static const char sig_part[] = "ASYLUM Music Format";
static const char sig_rest[] = " V1.0"; /* whee, string space optimization with format type below */
char signature [32];
if ( dumbfile_getnc( signature, 32, f ) != 32 ||
memcmp( signature, sig_part, 19 ) ||
memcmp( signature + 19, sig_rest, 5 ) ) {
return NULL;
}
sigdata = malloc(sizeof(*sigdata));
if (!sigdata) {
return NULL;
}
sigdata->speed = dumbfile_getc( f ); /* XXX seems to fit the files I have */
sigdata->tempo = dumbfile_getc( f ); /* ditto */
sigdata->n_samples = dumbfile_getc( f ); /* ditto */
sigdata->n_patterns = dumbfile_getc( f );
sigdata->n_orders = dumbfile_getc( f );
sigdata->restart_position = dumbfile_getc( f );
if ( dumbfile_error( f ) || !sigdata->n_samples || sigdata->n_samples > 64 || !sigdata->n_patterns ||
!sigdata->n_orders ) {
free( sigdata );
return NULL;
}
if ( sigdata->restart_position > sigdata->n_orders ) /* XXX */
sigdata->restart_position = 0;
sigdata->order = malloc( sigdata->n_orders );
if ( !sigdata->order ) {
free( sigdata );
return NULL;
}
if ( dumbfile_getnc( (char *) sigdata->order, sigdata->n_orders, f ) != sigdata->n_orders ||
dumbfile_skip( f, 256 - sigdata->n_orders ) ) {
free( sigdata->order );
free( sigdata );
return NULL;
}
sigdata->sample = malloc( sigdata->n_samples * sizeof( *sigdata->sample ) );
if ( !sigdata->sample ) {
free( sigdata->order );
free( sigdata );
return NULL;
}
sigdata->song_message = NULL;
sigdata->instrument = NULL;
sigdata->pattern = NULL;
sigdata->midi = NULL;
sigdata->checkpoint = NULL;
sigdata->n_instruments = 0;
for ( i = 0; i < sigdata->n_samples; ++i )
sigdata->sample[i].data = NULL;
for ( i = 0; i < sigdata->n_samples; ++i ) {
if ( it_asy_read_sample_header( &sigdata->sample[i], f ) ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
if ( dumbfile_skip( f, 37 * ( 64 - sigdata->n_samples ) ) ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
sigdata->pattern = malloc( sigdata->n_patterns * sizeof( *sigdata->pattern ) );
if ( !sigdata->pattern ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
for (i = 0; i < sigdata->n_patterns; ++i)
sigdata->pattern[i].entry = NULL;
/* Read in the patterns */
{
unsigned char *buffer = malloc( 64 * 8 * 4 ); /* 64 rows * 8 channels * 4 bytes */
if ( !buffer ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
for ( i = 0; i < sigdata->n_patterns; ++i ) {
if ( it_asy_read_pattern( &sigdata->pattern[i], f, buffer ) != 0 ) {
free( buffer );
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
free( buffer );
}
/* And finally, the sample data */
for ( i = 0; i < sigdata->n_samples; ++i ) {
if ( it_asy_read_sample_data( &sigdata->sample[i], f ) ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
/* Now let's initialise the remaining variables, and we're done! */
sigdata->flags = IT_WAS_AN_XM | IT_WAS_A_MOD | IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_STEREO;
sigdata->global_volume = 128;
sigdata->mixing_volume = 48;
sigdata->pan_separation = 128;
sigdata->n_pchannels = 8;
sigdata->name[0] = 0;
memset(sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS);
for (i = 0; i < DUMB_IT_N_CHANNELS; i += 4) {
int sep = 32 * dumb_it_default_panning_separation / 100;
sigdata->channel_pan[i+0] = 32 - sep;
sigdata->channel_pan[i+1] = 32 + sep;
sigdata->channel_pan[i+2] = 32 + sep;
sigdata->channel_pan[i+3] = 32 - sep;
}
_dumb_it_fix_invalid_orders(sigdata);
return sigdata;
}
DUH *dumb_read_asy_quick(DUMBFILE *f)
{
sigdata_t *sigdata;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
sigdata = it_asy_load_sigdata(f);
if (!sigdata)
return NULL;
{
const char *tag[2][2];
tag[0][0] = "TITLE";
tag[0][1] = (const char *)(((DUMB_IT_SIGDATA *)sigdata)->name);
tag[1][0] = "FORMAT";
tag[1][1] = "ASYLUM Music Format";
return make_duh(-1, 2, (const char *const (*)[2])tag, 1, &descptr, &sigdata);
}
}