ref: b8e4e314cfa8d21657e58b46f3b7a81ecbca5d9f
dir: /src/it/readstm.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readstm.c - Code to read a ScreamTracker 2 / / \ \
* module from an open file. | < / \_
* | \/ /\ /
* By Chris Moeller. \_ / > /
* | \ / /
* | ' /
* \__/
*/
// IT_STEREO... :o
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "dumb.h"
#include "internal/it.h"
#ifdef _MSC_VER
#define strnicmp _strnicmp
#else
#if defined(unix) || defined(__unix__) || defined(__unix)
#include <strings.h>
#endif
#define strnicmp strncasecmp
#endif
static int it_stm_read_sample_header( IT_SAMPLE *sample, DUMBFILE *f, unsigned short *offset )
{
dumbfile_getnc( (char *) sample->filename, 12, f );
sample->filename[12] = 0;
memcpy( sample->name, sample->filename, 13 );
dumbfile_skip( f, 2 );
*offset = dumbfile_igetw( f );
sample->length = dumbfile_igetw( f );
sample->loop_start = dumbfile_igetw( f );
sample->loop_end = dumbfile_igetw( f );
sample->default_volume = dumbfile_getc( f );
dumbfile_skip( f, 1 );
sample->C5_speed = dumbfile_igetw( f ) << 3;
dumbfile_skip( f, 6 );
if ( sample->length < 4 || !sample->default_volume ) {
/* Looks like no-existy. */
sample->flags &= ~IT_SAMPLE_EXISTS;
sample->length = 0;
*offset = 0;
return dumbfile_error( f );
}
sample->flags = IT_SAMPLE_EXISTS;
sample->global_volume = 64;
sample->default_pan = 0; // 0 = don't use, or 160 = centre?
if ( ( sample->loop_start < sample->length ) &&
( sample->loop_end > sample->loop_start ) &&
( sample->loop_end != 0xFFFF ) ) {
sample->flags |= IT_SAMPLE_LOOP;
if ( sample->loop_end > sample->length ) sample->loop_end = sample->length;
}
//Do we need to set all these?
sample->vibrato_speed = 0;
sample->vibrato_depth = 0;
sample->vibrato_rate = 0;
sample->vibrato_waveform = IT_VIBRATO_SINE;
sample->finetune = 0;
sample->max_resampling_quality = -1;
return dumbfile_error(f);
}
static int it_stm_read_sample_data( IT_SAMPLE *sample, DUMBFILE * f )
{
if ( ! sample->length ) return 0;
sample->data = malloc( sample->length );
if (!sample->data)
return -1;
dumbfile_getnc( sample->data, sample->length, f );
return dumbfile_error( f );
}
static int it_stm_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 * 4 * 4, f ) != 64 * 4 * 4 )
return -1;
pattern->n_entries = 64;
pos = 0;
for ( row = 0; row < 64; ++row ) {
for ( channel = 0; channel < 4; ++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 < 4; ++channel ) {
if ( buffer[ pos + 0 ] | buffer[ pos + 1 ] | buffer[ pos + 2 ] | buffer[ pos + 3 ] ) {
unsigned note;
note = buffer[ pos + 0 ];
entry->channel = channel;
entry->mask = 0;
entry->instrument = buffer[ pos + 1 ] >> 3;
entry->volpan = ( buffer[ pos + 1 ] & 0x07 ) + ( buffer[ pos + 2 ] >> 1 );
entry->effect = buffer[ pos + 2 ] & 0x0F;
entry->effectvalue = buffer[ pos + 3 ];
if ( entry->instrument && entry->instrument < 32 )
entry->mask |= IT_ENTRY_INSTRUMENT;
if ( note < 251 ) {
entry->mask |= IT_ENTRY_NOTE;
entry->note = ( note >> 4 ) * 12 + ( note & 0x0F );
}
if ( entry->volpan <= 64 )
entry->mask |= IT_ENTRY_VOLPAN;
entry->mask |= IT_ENTRY_EFFECT;
switch ( entry->effect ) {
case IT_SET_SPEED:
/* taken care of in the renderer */
break;
case IT_BREAK_TO_ROW:
entry->effectvalue -= (entry->effectvalue >> 4) * 6;
break;
case IT_JUMP_TO_ORDER:
case IT_VOLUME_SLIDE:
case IT_PORTAMENTO_DOWN:
case IT_PORTAMENTO_UP:
case IT_TONE_PORTAMENTO:
case IT_VIBRATO:
case IT_TREMOR:
case IT_ARPEGGIO:
case IT_VOLSLIDE_VIBRATO:
case IT_VOLSLIDE_TONEPORTA:
break;
default:
entry->mask &= ~IT_ENTRY_EFFECT;
break;
}
if ( entry->mask ) ++entry;
}
pos += 4;
}
IT_SET_END_ROW(entry);
++entry;
}
pattern->n_entries = (int)(entry - pattern->entry);
return 0;
}
static DUMB_IT_SIGDATA *it_stm_load_sigdata(DUMBFILE *f, int * version)
{
DUMB_IT_SIGDATA *sigdata;
char tracker_name[ 8 ];
unsigned short sample_offset[ 31 ];
int n;
sigdata = malloc(sizeof(*sigdata));
if (!sigdata) return NULL;
/* Skip song name. */
dumbfile_getnc((char *)sigdata->name, 20, f);
sigdata->name[20] = 0;
dumbfile_getnc(tracker_name, 8, f);
n = dumbfile_getc(f);
if ( n != 0x02 && n != 0x1A && n != 0x1B )
{
free( sigdata );
return NULL;
}
if ( dumbfile_getc(f) != 2 ) /* only support modules */
{
free( sigdata );
return NULL;
}
if ( strnicmp( tracker_name, "!Scream!", 8 ) &&
strnicmp( tracker_name, "BMOD2STM", 8 ) &&
strnicmp( tracker_name, "WUZAMOD!", 8 ) )
{
free( sigdata );
return NULL;
}
*version = dumbfile_mgetw(f);
sigdata->song_message = NULL;
sigdata->order = NULL;
sigdata->instrument = NULL;
sigdata->sample = NULL;
sigdata->pattern = NULL;
sigdata->midi = NULL;
sigdata->checkpoint = NULL;
sigdata->n_instruments = 0;
sigdata->n_samples = 31;
sigdata->n_pchannels = 4;
sigdata->tempo = 125;
sigdata->mixing_volume = 48;
sigdata->pan_separation = 128;
/** WARNING: which ones? */
sigdata->flags = IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_WAS_AN_S3M | IT_WAS_AN_STM | IT_STEREO;
n = dumbfile_getc(f);
if ( n < 32 ) n = 32;
sigdata->speed = n;
sigdata->n_patterns = dumbfile_getc(f);
sigdata->global_volume = dumbfile_getc(f) << 1;
if ( sigdata->global_volume > 128 ) sigdata->global_volume = 128;
dumbfile_skip(f, 13);
if ( dumbfile_error(f) || sigdata->n_patterns < 1 || sigdata->n_patterns > 99 ) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));
if (!sigdata->sample) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
for (n = 0; n < sigdata->n_samples; n++)
sigdata->sample[n].data = NULL;
if (sigdata->n_patterns) {
sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));
if (!sigdata->pattern) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
for (n = 0; n < sigdata->n_patterns; n++)
sigdata->pattern[n].entry = NULL;
}
memset( sigdata->channel_volume, 64, 4 );
n = 32 * dumb_it_default_panning_separation / 100;
sigdata->channel_pan[ 0 ] = 32 + n;
sigdata->channel_pan[ 1 ] = 32 - n;
sigdata->channel_pan[ 2 ] = 32 + n;
sigdata->channel_pan[ 3 ] = 32 - n;
for ( n = 0; n < sigdata->n_samples; ++n ) {
if ( it_stm_read_sample_header( &sigdata->sample[ n ], f, &sample_offset[ n ] ) ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
sigdata->order = malloc( 128 );
if ( !sigdata->order ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
/* Orders, byte each, length = sigdata->n_orders (should be even) */
dumbfile_getnc( (char *) sigdata->order, *version >= 0x200 ? 128 : 64, f );
if (*version < 0x200) memset( sigdata->order + 64, 0xFF, 64 );
sigdata->restart_position = 0;
for ( n = 127; n >= 0; --n ) {
if ( sigdata->order[ n ] < sigdata->n_patterns ) break;
}
if ( n < 0 ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
sigdata->n_orders = n + 1;
for ( n = 0; n < 128; ++n ) {
if ( sigdata->order[ n ] >= 99 ) sigdata->order[ n ] = 0xFF;
}
if ( sigdata->n_patterns ) {
unsigned char * buffer = malloc( 64 * 4 * 4 );
if ( ! buffer ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
for ( n = 0; n < sigdata->n_patterns; ++n ) {
if ( it_stm_read_pattern( &sigdata->pattern[ n ], f, buffer ) ) {
free( buffer );
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
free( buffer );
}
for ( n = 0; n < sigdata->n_samples; ++n ) {
if ( sample_offset[ n ] )
{
if ( dumbfile_seek( f, sample_offset[ n ] * 16, DFS_SEEK_SET ) ||
it_stm_read_sample_data( &sigdata->sample[ n ], f ) ) {
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
}
else
{
sigdata->sample[ n ].flags = 0;
sigdata->sample[ n ].length = 0;
}
}
_dumb_it_fix_invalid_orders(sigdata);
return sigdata;
}
DUH *dumb_read_stm_quick(DUMBFILE *f)
{
sigdata_t *sigdata;
int ver;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
sigdata = it_stm_load_sigdata(f , &ver);
if (!sigdata)
return NULL;
{
char version[16];
const char *tag[2][2];
tag[0][0] = "TITLE";
tag[0][1] = (const char *)(((DUMB_IT_SIGDATA *)sigdata)->name);
tag[1][0] = "FORMAT";
version[0] = 'S';
version[1] = 'T';
version[2] = 'M';
version[3] = ' ';
version[4] = 'v';
version[5] = '0' + ((ver >> 8) & 15);
version[6] = '.';
if ((ver & 255) > 99)
{
version[7] = '0' + ((ver & 255) / 100 );
version[8] = '0' + (((ver & 255) / 10) % 10);
version[9] = '0' + ((ver & 255) % 10);
version[10] = 0;
}
else
{
version[7] = '0' + ((ver & 255) / 10);
version[8] = '0' + ((ver & 255) % 10);
version[9] = 0;
}
tag[1][1] = (const char *) &version;
return make_duh(-1, 2, (const char *const (*)[2])tag, 1, &descptr, &sigdata);
}
}