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