ref: 76a0d893ecd96f1aa2b25010823428fdd63e7772
dir: /src/it/readamf.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readamf.c - Code to read a DSMI AMF 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 void it_amf_process_track( IT_ENTRY *entry_table, unsigned char *track, int rows, int channels )
{
int last_instrument = 0;
int tracksize = track[ 0 ] + ( track[ 1 ] << 8 ) + ( track[ 2 ] << 16 );
track += 3;
while ( tracksize-- ) {
unsigned int row = track[ 0 ];
unsigned int command = track[ 1 ];
unsigned int argument = track[ 2 ];
IT_ENTRY * entry = entry_table + row * channels;
if ( row >= ( unsigned int ) rows ) break;
if ( command < 0x7F ) {
entry->mask |= IT_ENTRY_NOTE | IT_ENTRY_INSTRUMENT | IT_ENTRY_VOLPAN;
entry->note = command;
if ( ! entry->instrument ) entry->instrument = last_instrument;
entry->volpan = argument;
}
else if ( command == 0x7F ) {
signed char row_delta = ( signed char ) argument;
int row_source = ( int ) row + ( int ) row_delta;
if ( row_source >= 0 && row_source < ( int ) rows ) {
*entry = entry_table[ row_source * channels ];
}
}
else if ( command == 0x80 ) {
entry->mask |= IT_ENTRY_INSTRUMENT;
last_instrument = argument + 1;
entry->instrument = last_instrument;
}
else if ( command == 0x83 ) {
entry->mask |= IT_ENTRY_VOLPAN;
entry->volpan = argument;
}
else {
unsigned int effect = command & 0x7F;
unsigned int effectvalue = argument;
switch (effect) {
case 0x01: effect = IT_SET_SPEED; break;
case 0x02: effect = IT_VOLUME_SLIDE;
case 0x0A: if ( effect == 0x0A ) effect = IT_VOLSLIDE_TONEPORTA;
case 0x0B: if ( effect == 0x0B ) effect = IT_VOLSLIDE_VIBRATO;
if ( effectvalue & 0x80 ) effectvalue = ( -( signed char ) effectvalue ) & 0x0F;
else effectvalue = ( effectvalue & 0x0F ) << 4;
break;
case 0x04:
if ( effectvalue & 0x80 ) {
effect = IT_PORTAMENTO_UP;
effectvalue = ( -( signed char ) effectvalue ) & 0x7F;
}
else {
effect = IT_PORTAMENTO_DOWN;
}
break;
case 0x06: effect = IT_TONE_PORTAMENTO; break;
case 0x07: effect = IT_TREMOR; break;
case 0x08: effect = IT_ARPEGGIO; break;
case 0x09: effect = IT_VIBRATO; break;
case 0x0C: effect = IT_BREAK_TO_ROW; break;
case 0x0D: effect = IT_JUMP_TO_ORDER; break;
case 0x0F: effect = IT_RETRIGGER_NOTE; break;
case 0x10: effect = IT_SET_SAMPLE_OFFSET; break;
case 0x11:
if ( effectvalue ) {
effect = IT_VOLUME_SLIDE;
if ( effectvalue & 0x80 )
effectvalue = 0xF0 | ( ( -( signed char ) effectvalue ) & 0x0F );
else
effectvalue = 0x0F | ( ( effectvalue & 0x0F ) << 4 );
}
else
effect = 0;
break;
case 0x12:
case 0x16:
if ( effectvalue ) {
int mask = ( effect == 0x16 ) ? 0xE0 : 0xF0;
effect = ( effectvalue & 0x80 ) ? IT_PORTAMENTO_UP : IT_PORTAMENTO_DOWN;
if ( effectvalue & 0x80 )
effectvalue = mask | ( ( -( signed char ) effectvalue ) & 0x0F );
else
effectvalue = mask | ( effectvalue & 0x0F );
}
else
effect = 0;
break;
case 0x13:
effect = IT_S;
effectvalue = EFFECT_VALUE( IT_S_NOTE_DELAY, effectvalue & 0x0F );
break;
case 0x14:
effect = IT_S;
effectvalue = EFFECT_VALUE( IT_S_DELAYED_NOTE_CUT, effectvalue & 0x0F );
break;
case 0x15: effect = IT_SET_SONG_TEMPO; break;
case 0x17:
effectvalue = ( effectvalue + 64 ) & 0x7F;
if ( entry->mask & IT_ENTRY_EFFECT ) {
if ( !( entry->mask & IT_ENTRY_VOLPAN ) ) {
entry->mask |= IT_ENTRY_VOLPAN;
entry->volpan = ( effectvalue / 2 ) + 128;
}
effect = 0;
}
else {
effect = IT_SET_PANNING;
}
break;
default: effect = effectvalue = 0;
}
if ( effect ) {
entry->mask |= IT_ENTRY_EFFECT;
entry->effect = effect;
entry->effectvalue = effectvalue;
}
}
track += 3;
}
}
static int it_amf_process_pattern( IT_PATTERN *pattern, IT_ENTRY *entry_table, int rows, int channels )
{
int i, j;
int n_entries = rows;
IT_ENTRY * entry;
pattern->n_rows = rows;
for ( i = 0, j = channels * rows; i < j; i++ ) {
if ( entry_table[ i ].mask ) {
n_entries++;
}
}
pattern->n_entries = n_entries;
pattern->entry = entry = malloc( n_entries * sizeof( IT_ENTRY ) );
if ( !entry ) {
return -1;
}
for ( i = 0; i < rows; i++ ) {
for ( j = 0; j < channels; j++ ) {
if ( entry_table[ i * channels + j ].mask ) {
*entry = entry_table[ i * channels + j ];
entry->channel = j;
entry++;
}
}
IT_SET_END_ROW( entry );
entry++;
}
return 0;
}
static int it_amf_read_sample_header( IT_SAMPLE *sample, DUMBFILE *f, int * offset, int ver )
{
int exists;
exists = dumbfile_getc( f );
dumbfile_getnc( (char *) sample->name, 32, f );
sample->name[32] = 0;
dumbfile_getnc( (char *) sample->filename, 13, f );
sample->filename[13] = 0;
*offset = (int)dumbfile_igetl( f );
sample->length = dumbfile_igetl( f );
sample->C5_speed = dumbfile_igetw( f );
sample->default_volume = dumbfile_getc( f );
sample->global_volume = 64;
if ( sample->default_volume > 64 ) sample->default_volume = 64;
if ( ver >= 11 ) {
sample->loop_start = dumbfile_igetl( f );
sample->loop_end = dumbfile_igetl( f );
} else {
sample->loop_start = dumbfile_igetw( f );
sample->loop_end = sample->length;
}
if ( sample->length <= 0 ) {
sample->flags = 0;
return 0;
}
sample->flags = exists == 1 ? IT_SAMPLE_EXISTS : 0;
sample->default_pan = 0;
sample->finetune = 0;
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_amf_read_sample_data( IT_SAMPLE *sample, DUMBFILE *f )
{
int i, read_length = 0;
sample->data = malloc( sample->length );
if ( !sample->data )
return -1;
if ( sample->length )
read_length = (int)dumbfile_getnc( sample->data, sample->length, f );
if ( read_length < 0 )
read_length = 0;
for ( i = 0; i < read_length; i++ ) {
( ( signed char * ) sample->data )[ i ] ^= 0x80;
}
for ( i = read_length; i < sample->length; i++ ) {
( ( signed char * ) sample->data )[ i ] = 0;
}
return 0; /* Sometimes the last sample is truncated :( */
}
static DUMB_IT_SIGDATA *it_amf_load_sigdata(DUMBFILE *f, int * version)
{
DUMB_IT_SIGDATA *sigdata;
int i, j, ver, ntracks, realntracks, nchannels;
int maxsampleseekpos = 0;
int sampleseekpos[256];
unsigned short *orderstotracks;
unsigned short *trackmap;
unsigned int tracksize[256];
unsigned char **track;
static const char sig[] = "AMF";
char signature [3];
if ( dumbfile_getnc( signature, 3, f ) != 3 ||
memcmp( signature, sig, 3 ) ) {
return NULL;
}
*version = ver = dumbfile_getc( f );
if ( ver < 10 || ver > 14) {
return NULL;
}
sigdata = malloc(sizeof(*sigdata));
if (!sigdata) {
return NULL;
}
dumbfile_getnc( (char *) sigdata->name, 32, f );
sigdata->name[ 32 ] = 0;
sigdata->n_samples = dumbfile_getc( f );
sigdata->n_orders = dumbfile_getc( f );
ntracks = dumbfile_igetw( f );
nchannels = dumbfile_getc( f );
if ( dumbfile_error( f ) ||
sigdata->n_samples < 1 || sigdata->n_samples > 255 ||
sigdata->n_orders < 1 || sigdata->n_orders > 255 ||
! ntracks ||
nchannels < 1 || nchannels > 32 ) {
free( sigdata );
return NULL;
}
sigdata->n_pchannels = nchannels;
memset( sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS );
if ( ver >= 11 ) {
int nchannels = ( ver >= 13 ) ? 32 : 16;
for ( i = 0; i < nchannels; i++ ) {
signed char panpos = dumbfile_getc( f );
int pan = ( panpos + 64 ) / 2;
if ( pan < 0 ) pan = 0;
else if ( pan > 64 ) pan = IT_SURROUND;
sigdata->channel_pan[ i ] = pan;
}
}
else {
int sep = 32 * dumb_it_default_panning_separation / 100;
for ( i = 0; i < 16; i++ ) {
sigdata->channel_pan[ i ] = ( dumbfile_getc( f ) & 1 ) ? 32 - sep : 32 + sep;
}
}
sigdata->tempo = 125;
sigdata->speed = 6;
if ( ver >= 13 ) {
i = dumbfile_getc( f );
if ( i >= 32 ) sigdata->tempo = i;
i = dumbfile_getc( f );
if ( i <= 32 ) sigdata->speed = i;
}
sigdata->order = malloc( sigdata->n_orders );
if ( !sigdata->order ) {
free( sigdata );
return NULL;
}
orderstotracks = malloc( sigdata->n_orders * nchannels * sizeof( unsigned short ) );
if ( !orderstotracks ) {
free( sigdata->order );
free( sigdata );
return NULL;
}
for ( i = 0; i < sigdata->n_orders; i++ ) {
sigdata->order[ i ] = i;
tracksize[ i ] = 64;
if ( ver >= 14 ) {
tracksize[ i ] = dumbfile_igetw( f );
}
for ( j = 0; j < nchannels; j++ ) {
orderstotracks[ i * nchannels + j ] = dumbfile_igetw( f );
}
}
if ( dumbfile_error( f ) ) {
free( orderstotracks );
free( sigdata->order );
free( sigdata );
return NULL;
}
sigdata->sample = malloc( sigdata->n_samples * sizeof( *sigdata->sample ) );
if ( !sigdata->sample ) {
free( orderstotracks );
free( sigdata->order );
free( sigdata );
return NULL;
}
sigdata->restart_position = 0;
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 ) {
int offset;
if ( it_amf_read_sample_header( &sigdata->sample[i], f, &offset, ver ) ) {
goto error_ott;
}
sampleseekpos[ i ] = offset;
if ( offset > maxsampleseekpos ) maxsampleseekpos = offset;
}
sigdata->n_patterns = sigdata->n_orders;
sigdata->pattern = malloc( sigdata->n_patterns * sizeof( *sigdata->pattern ) );
if ( !sigdata->pattern ) {
goto error_ott;
}
for (i = 0; i < sigdata->n_patterns; ++i)
sigdata->pattern[i].entry = NULL;
trackmap = malloc( ntracks * sizeof( unsigned short ) );
if ( !trackmap ) {
goto error_ott;
}
if ( dumbfile_getnc( ( char * ) trackmap, ntracks * sizeof( unsigned short ), f ) != (long)(ntracks * sizeof( unsigned short )) ) {
goto error_tm;
}
realntracks = 0;
for ( i = 0; i < ntracks; i++ ) {
if ( trackmap[ i ] > realntracks ) realntracks = trackmap[ i ];
}
track = calloc( realntracks, sizeof( unsigned char * ) );
if ( !track ) {
goto error_tm;
}
for ( i = 0; i < realntracks; i++ ) {
int tracksize = dumbfile_igetw( f );
tracksize += dumbfile_getc( f ) << 16;
track[ i ] = malloc( tracksize * 3 + 3 );
if ( !track[ i ] ) {
goto error_all;
}
track[ i ][ 0 ] = tracksize & 255;
track[ i ][ 1 ] = ( tracksize >> 8 ) & 255;
track[ i ][ 2 ] = ( tracksize >> 16 ) & 255;
if ( dumbfile_getnc( (char *) track[ i ] + 3, tracksize * 3, f ) != tracksize * 3 ) {
goto error_all;
}
}
for ( i = 1; i <= maxsampleseekpos; i++ ) {
for ( j = 0; j < sigdata->n_samples; j++ ) {
if ( sampleseekpos[ j ] == i ) {
if ( it_amf_read_sample_data( &sigdata->sample[ j ], f ) ) {
goto error_all;
}
break;
}
}
}
/* Process tracks into patterns */
for ( i = 0; i < sigdata->n_patterns; i++ ) {
IT_ENTRY * entry_table = calloc( tracksize[ i ] * nchannels, sizeof( IT_ENTRY ) );
if ( !entry_table ) {
goto error_all;
}
for ( j = 0; j < nchannels; j++ ) {
int ntrack = orderstotracks[ i * nchannels + j ];
if ( ntrack && ntrack <= ntracks ) {
int realtrack = trackmap[ ntrack - 1 ];
if ( realtrack ) {
realtrack--;
if ( realtrack < realntracks && track[ realtrack ] ) {
it_amf_process_track( entry_table + j, track[ realtrack ], tracksize[ i ], nchannels );
}
}
}
}
if ( it_amf_process_pattern( &sigdata->pattern[ i ], entry_table, tracksize[ i ], nchannels ) ) {
free( entry_table );
goto error_all;
}
free( entry_table );
}
/* Now let's initialise the remaining variables, and we're done! */
sigdata->flags = IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_STEREO | IT_WAS_AN_S3M;
sigdata->global_volume = 128;
sigdata->mixing_volume = 48;
sigdata->pan_separation = 128;
_dumb_it_fix_invalid_orders(sigdata);
for ( i = 0; i < realntracks; i++ ) {
if ( track[ i ] ) {
free( track[ i ] );
}
}
free( track );
free( trackmap );
free( orderstotracks );
return sigdata;
error_all:
for ( i = 0; i < realntracks; i++ ) {
if ( track[ i ] ) {
free( track[ i ] );
}
}
free( track );
error_tm:
free( trackmap );
error_ott:
free( orderstotracks );
_dumb_it_unload_sigdata( sigdata );
return NULL;
}
DUH *dumb_read_amf_quick(DUMBFILE *f)
{
sigdata_t *sigdata;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
int version;
sigdata = it_amf_load_sigdata(f, &version);
if (!sigdata)
return NULL;
{
const char *tag[2][2];
char ver_string[14];
tag[0][0] = "TITLE";
tag[0][1] = (const char *)(((DUMB_IT_SIGDATA *)sigdata)->name);
tag[1][0] = "FORMAT";
memcpy( ver_string, "DSMI AMF v", 10 );
ver_string[10] = '0' + version / 10;
ver_string[11] = '.';
ver_string[12] = '0' + version % 10;
ver_string[13] = 0;
tag[1][1] = ver_string;
return make_duh(-1, 2, (const char *const (*)[2])tag, 1, &descptr, &sigdata);
}
}