ref: 657e36b7e60c9781ec4a8715e982955fd34e5305
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);
}
}