ref: 74414b91d904eb3c7c9fa084695178c1387cd7d0
dir: /src/it/readptm.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readptm.c - Code to read a Poly Tracker v2.03 / / \ \
* module from an open file. | < / \_
* | \/ /\ /
* By Christopher Snowhill. Based on reads3m.c \_ / > /
* by entheh. | \ / /
* | ' /
* \__/
*/
// IT_STEREO... :o
#include <stdlib.h>
#include <string.h>
#include "dumb.h"
#include "internal/it.h"
static int it_ptm_read_sample_header(IT_SAMPLE *sample, long *offset,
DUMBFILE *f) {
int flags;
flags = dumbfile_getc(f);
dumbfile_getnc((char *)sample->filename, 12, f);
sample->filename[12] = 0;
sample->default_volume = dumbfile_getc(f);
sample->C5_speed = dumbfile_igetw(f) << 1;
dumbfile_skip(f, 2); /* segment */
*offset = dumbfile_igetl(f);
sample->length = dumbfile_igetl(f);
sample->loop_start = dumbfile_igetl(f);
sample->loop_end = dumbfile_igetl(f);
/* GUSBegin, GUSLStart, GUSLEnd, GUSLoop, reserverd */
dumbfile_skip(f, 4 + 4 + 4 + 1 + 1);
dumbfile_getnc((char *)sample->name, 28, f);
sample->name[28] = 0;
/*
if (dumbfile_mgetl(f) != DUMB_ID('P','T','M','S'))
return -1;
*/
/* BLAH! Shit likes to have broken or missing sample IDs */
dumbfile_skip(f, 4);
if ((flags & 3) == 0) {
/* Looks like no sample */
sample->flags &= ~IT_SAMPLE_EXISTS;
return dumbfile_error(f);
}
sample->global_volume = 64;
sample->flags = IT_SAMPLE_EXISTS;
if (flags & 4)
sample->flags |= IT_SAMPLE_LOOP;
if (flags & 8)
sample->flags |= IT_SAMPLE_PINGPONG_LOOP;
if (flags & 16) {
sample->flags |= IT_SAMPLE_16BIT;
sample->length >>= 1;
sample->loop_start >>= 1;
sample->loop_end >>= 1;
}
if (sample->loop_end)
sample->loop_end--;
sample->default_pan = 0; // 0 = don't use, or 160 = centre?
if (sample->length <= 0)
sample->flags &= ~IT_SAMPLE_EXISTS;
else if (sample->flags & IT_SAMPLE_LOOP) {
if ((unsigned int)sample->loop_end > (unsigned int)sample->length)
sample->flags &= ~IT_SAMPLE_LOOP;
else if ((unsigned int)sample->loop_start >=
(unsigned int)sample->loop_end)
sample->flags &= ~IT_SAMPLE_LOOP;
else
sample->length = sample->loop_end;
}
// 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_ptm_read_byte(DUMBFILE *f) {
int meh = dumbfile_getc(f);
if (meh < 0)
return 0;
return meh;
}
static int it_ptm_read_sample_data(IT_SAMPLE *sample, int last, DUMBFILE *f) {
long n;
int s;
sample->data =
malloc(sample->length * (sample->flags & IT_SAMPLE_16BIT ? 2 : 1));
if (!sample->data)
return -1;
s = 0;
if (sample->flags & IT_SAMPLE_16BIT) {
unsigned char a, b;
for (n = 0; n < sample->length; n++) {
a = s += (signed char)it_ptm_read_byte(f);
b = s += (signed char)it_ptm_read_byte(f);
((short *)sample->data)[n] = a | (b << 8);
}
} else {
for (n = 0; n < sample->length; n++) {
s += (signed char)it_ptm_read_byte(f);
((signed char *)sample->data)[n] = s;
}
}
if (dumbfile_error(f) && !last)
return -1;
return 0;
}
static int it_ptm_read_pattern(IT_PATTERN *pattern, DUMBFILE *f,
unsigned char *buffer, size_t length) {
int buflen = 0;
int bufpos = 0;
int effect, effectvalue;
IT_ENTRY *entry;
unsigned char channel;
if (!length)
return -1;
pattern->n_rows = 0;
pattern->n_entries = 0;
/* Read in the pattern data, little by little, and work out how many
* entries we need room for. Sorry, but this is just so funny...
*/
for (;;) {
unsigned char b = buffer[buflen++] = dumbfile_getc(f);
#if 1
static const unsigned char used[8] = {0, 2, 2, 4, 1, 3, 3, 5};
channel = b & 31;
b >>= 5;
pattern->n_entries++;
if (b) {
if (buflen + used[b] >= 65536)
return -1;
dumbfile_getnc((char *)buffer + buflen, used[b], f);
buflen += used[b];
} else {
/* End of row */
if (++pattern->n_rows == 64)
break;
if (buflen >= 65536)
return -1;
}
#else
if (b == 0) {
/* End of row */
pattern->n_entries++;
if (++pattern->n_rows == 64)
break;
if (buflen >= 65536)
return -1;
} else {
static const unsigned char used[8] = {0, 2, 2, 4, 1, 3, 3, 5};
channel = b & 31;
b >>= 5;
if (b) {
pattern->n_entries++;
if (buflen + used[b] >= 65536)
return -1;
dumbfile_getnc(buffer + buflen, used[b], f);
buflen += used[b];
}
}
#endif
/* We have ensured that buflen < 65536 at this point, so it is safe
* to iterate and read at least one more byte without checking.
* However, now would be a good time to check for errors reading from
* the file.
*/
if (dumbfile_error(f))
return -1;
/* Great. We ran out of data, but there should be data for more rows.
* Fill the rest with null data...
*/
if (buflen >= (dumb_ssize_t)length && pattern->n_rows < 64) {
while (pattern->n_rows < 64) {
if (buflen >= 65536)
return -1;
buffer[buflen++] = 0;
pattern->n_entries++;
pattern->n_rows++;
}
break;
}
}
pattern->entry = malloc(pattern->n_entries * sizeof(*pattern->entry));
if (!pattern->entry)
return -1;
entry = pattern->entry;
while (bufpos < buflen) {
unsigned char b = buffer[bufpos++];
if (b == 0) {
/* End of row */
IT_SET_END_ROW(entry);
entry++;
continue;
}
channel = b & 31;
if (b & 224) {
entry->mask = 0;
entry->channel = channel;
if (b & 32) {
unsigned char n = buffer[bufpos++];
if (n == 254 || (n >= 1 && n <= 120)) {
if (n == 254)
entry->note = IT_NOTE_CUT;
else
entry->note = n - 1;
entry->mask |= IT_ENTRY_NOTE;
}
entry->instrument = buffer[bufpos++];
if (entry->instrument)
entry->mask |= IT_ENTRY_INSTRUMENT;
}
if (b & 64) {
effect = buffer[bufpos++];
effectvalue = buffer[bufpos++];
_dumb_it_ptm_convert_effect(effect, effectvalue, entry);
}
if (b & 128) {
entry->volpan = buffer[bufpos++];
if (entry->volpan <= 64)
entry->mask |= IT_ENTRY_VOLPAN;
}
entry++;
}
}
ASSERT(entry == pattern->entry + pattern->n_entries);
return 0;
}
/** WARNING: this is duplicated in itread.c - also bad practice to use the same
* struct name unless they are unified in a header */
/* Currently we assume the sample data are stored after the sample headers in
* module files. This assumption may be unjustified; let me know if you have
* trouble.
*/
#define PTM_COMPONENT_INSTRUMENT 1
#define PTM_COMPONENT_PATTERN 2
#define PTM_COMPONENT_SAMPLE 3
typedef struct PTM_COMPONENT {
unsigned char type;
unsigned char n;
long offset;
} PTM_COMPONENT;
static int ptm_component_compare(const void *e1, const void *e2) {
return (int)(((const PTM_COMPONENT *)e1)->offset -
((const PTM_COMPONENT *)e2)->offset);
}
static DUMB_IT_SIGDATA *it_ptm_load_sigdata(DUMBFILE *f) {
DUMB_IT_SIGDATA *sigdata;
PTM_COMPONENT *component;
int n_components = 0;
int n;
unsigned char *buffer;
sigdata = malloc(sizeof(*sigdata));
if (!sigdata)
return NULL;
/* Skip song name. */
dumbfile_getnc((char *)sigdata->name, 28, f);
sigdata->name[28] = 0;
if (dumbfile_getc(f) != 0x1A || dumbfile_igetw(f) != 0x203) {
free(sigdata);
return NULL;
}
dumbfile_skip(f, 1);
sigdata->song_message = NULL;
sigdata->order = NULL;
sigdata->instrument = NULL;
sigdata->sample = NULL;
sigdata->pattern = NULL;
sigdata->midi = NULL;
sigdata->checkpoint = NULL;
sigdata->n_orders = dumbfile_igetw(f);
sigdata->n_instruments = 0;
sigdata->n_samples = dumbfile_igetw(f);
sigdata->n_patterns = dumbfile_igetw(f);
if (dumbfile_error(f) || sigdata->n_orders <= 0 ||
sigdata->n_orders > 1024 || // Whoa, nelly.
sigdata->n_samples > 255 || sigdata->n_patterns > 128) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
sigdata->n_pchannels = dumbfile_igetw(f);
if (dumbfile_igetw(f) != 0) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
dumbfile_skip(f, 2);
if (dumbfile_mgetl(f) != DUMB_ID('P', 'T', 'M', 'F')) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
dumbfile_skip(f, 16);
sigdata->order = malloc(sigdata->n_orders);
if (!sigdata->order) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
if (sigdata->n_samples) {
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;
}
/** WARNING: which ones? */
sigdata->flags =
IT_STEREO | IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_WAS_A_PTM;
sigdata->global_volume = 128;
sigdata->speed = 6;
sigdata->tempo = 125;
sigdata->mixing_volume = 48;
/* Panning positions for 32 channels */
{
int i;
for (i = 0; i < 32; i++) {
int c = dumbfile_getc(f);
if (c <= 15) {
sigdata->channel_volume[i] = 64;
sigdata->channel_pan[i] = c;
} else {
/** WARNING: this could be improved if we support channel
* muting... */
sigdata->channel_volume[i] = 0;
sigdata->channel_pan[i] = 7;
}
}
}
/* Orders, byte each, length = sigdata->n_orders (should be even) */
dumbfile_getnc((char *)sigdata->order, sigdata->n_orders, f);
sigdata->restart_position = 0;
component = malloc(768 * sizeof(*component));
if (!component) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
if (dumbfile_seek(f, 352, DFS_SEEK_SET)) {
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
for (n = 0; n < sigdata->n_patterns; n++) {
component[n_components].type = PTM_COMPONENT_PATTERN;
component[n_components].n = n;
component[n_components].offset = dumbfile_igetw(f) << 4;
n_components++;
}
if (dumbfile_seek(f, 608, DFS_SEEK_SET)) {
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
for (n = 0; n < sigdata->n_samples; n++) {
if (it_ptm_read_sample_header(&sigdata->sample[n],
&component[n_components].offset, f)) {
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
if (!(sigdata->sample[n].flags & IT_SAMPLE_EXISTS))
continue;
component[n_components].type = PTM_COMPONENT_SAMPLE;
component[n_components].n = n;
n_components++;
}
qsort(component, n_components, sizeof(PTM_COMPONENT),
&ptm_component_compare);
{
int i;
for (i = 0; i < 32; i++) {
sigdata->channel_pan[i] -= (sigdata->channel_pan[i] & 8) >> 3;
sigdata->channel_pan[i] = ((int)sigdata->channel_pan[i] << 5) / 7;
if (sigdata->channel_pan[i] > 64)
sigdata->channel_pan[i] = 64;
}
}
sigdata->pan_separation = 128;
if (dumbfile_error(f)) {
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
buffer = malloc(65536);
if (!buffer) {
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
for (n = 0; n < n_components; n++) {
if (dumbfile_seek(f, component[n].offset, DFS_SEEK_SET)) {
free(buffer);
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
switch (component[n].type) {
case PTM_COMPONENT_PATTERN:
if (it_ptm_read_pattern(
&sigdata->pattern[component[n].n], f, buffer,
(n + 1 < n_components)
? (component[n + 1].offset - component[n].offset)
: 0)) {
free(buffer);
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
break;
case PTM_COMPONENT_SAMPLE:
if (it_ptm_read_sample_data(&sigdata->sample[component[n].n],
(n + 1 == n_components), f)) {
free(buffer);
free(component);
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
}
}
free(buffer);
free(component);
if (_dumb_it_fix_invalid_orders(sigdata) < 0) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
return sigdata;
}
DUH *dumb_read_ptm_quick(DUMBFILE *f) {
sigdata_t *sigdata;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
sigdata = it_ptm_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] = "PTM";
return make_duh(-1, 2, (const char *const(*)[2])tag, 1, &descptr,
&sigdata);
}
}