ref: cab1803f1d6517754696b5c3d9b600e23ef9015e
dir: /src/it/readamf.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readamf.c - Code to read a DSMI AMF module from / / \ \
* an open file. | < / \_
* | \/ /\ /
* By Christopher Snowhill. \_ / > /
* | \ / /
* | ' /
* \__/
*/
#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;
for (i = 0; i < realntracks; i++) {
if (track[i]) {
free(track[i]);
}
}
free(track);
free(trackmap);
free(orderstotracks);
if (_dumb_it_fix_invalid_orders(sigdata) < 0) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
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);
}
}