ref: fbd0eed489f59a6fbca4eee56eef7e3f8ad52e29
dir: /src/it/readam.c/
/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* readam.c - Code to read a RIFF AM module / / \ \
* from a parsed RIFF structure. | < / \_
* | \/ /\ /
* By Christopher Snowhill. \_ / > /
* | \ / /
* | ' /
* \__/
*/
#include <stdlib.h>
#include <string.h>
#include "dumb.h"
#include "internal/it.h"
#include "internal/riff.h"
static int it_riff_am_process_sample(IT_SAMPLE *sample, DUMBFILE *f, size_t len,
int ver) {
size_t header_length;
int default_pan;
int default_volume;
int flags;
size_t length;
size_t length_bytes;
size_t loop_start;
size_t loop_end;
size_t sample_rate;
long start = dumbfile_pos(f);
if (ver == 0) {
if (len < 0x38)
return -1;
header_length = 0x38;
dumbfile_getnc((char *)sample->name, 28, f);
sample->name[28] = 0;
default_pan = dumbfile_getc(f);
default_volume = dumbfile_getc(f);
flags = dumbfile_igetw(f);
length = dumbfile_igetl(f);
loop_start = dumbfile_igetl(f);
loop_end = dumbfile_igetl(f);
sample_rate = dumbfile_igetl(f);
} else {
if (len < 4)
return -1;
header_length = dumbfile_igetl(f);
if (header_length < 0x40)
return -1;
if (header_length + 4 > len)
return -1;
start += 4;
len -= 4;
dumbfile_getnc((char *)sample->name, 32, f);
default_pan = dumbfile_igetw(f);
default_volume = dumbfile_igetw(f);
flags = dumbfile_igetw(f);
dumbfile_skip(f, 2);
length = dumbfile_igetl(f);
loop_start = dumbfile_igetl(f);
loop_end = dumbfile_igetl(f);
sample_rate = dumbfile_igetl(f);
if (default_pan > 0x7FFF || default_volume > 0x7FFF)
return -1;
default_pan = default_pan * 64 / 32767;
default_volume = default_volume * 64 / 32767;
}
if (!length) {
sample->flags &= ~IT_SAMPLE_EXISTS;
return 0;
}
if (flags & ~(0x8000 | 0x80 | 0x20 | 0x10 | 0x08 | 0x04))
return -1;
length_bytes = length << ((flags & 0x04) >> 2);
if (length_bytes + header_length > len)
return -1;
sample->flags = 0;
if (flags & 0x80)
sample->flags |= IT_SAMPLE_EXISTS;
if (flags & 0x04)
sample->flags |= IT_SAMPLE_16BIT;
sample->length = length;
sample->loop_start = loop_start;
sample->loop_end = loop_end;
sample->C5_speed = sample_rate;
sample->default_volume = default_volume;
sample->default_pan = default_pan | ((flags & 0x20) << 2);
sample->filename[0] = 0;
sample->global_volume = 64;
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;
if (flags & 0x08) {
if (((unsigned int)sample->loop_end <= (unsigned int)sample->length) &&
((unsigned int)sample->loop_start <
(unsigned int)sample->loop_end)) {
sample->length = sample->loop_end;
sample->flags |= IT_SAMPLE_LOOP;
if (flags & 0x10)
sample->flags |= IT_SAMPLE_PINGPONG_LOOP;
}
}
length_bytes = sample->length << ((flags & 0x04) >> 2);
sample->data = malloc(length_bytes);
if (!sample->data)
return -1;
if (dumbfile_seek(f, start + header_length, DFS_SEEK_SET))
return -1;
dumbfile_getnc(sample->data, length_bytes, f);
return 0;
}
static int it_riff_am_process_pattern(IT_PATTERN *pattern, DUMBFILE *f,
size_t len, int ver) {
int nrows, row;
long start, end;
unsigned flags;
int p, q, r;
IT_ENTRY *entry;
nrows = dumbfile_getc(f) + 1;
pattern->n_rows = nrows;
len -= 1;
pattern->n_entries = 0;
row = 0;
start = dumbfile_pos(f);
end = start + len;
while ((row < nrows) && !dumbfile_error(f) && (dumbfile_pos(f) < end)) {
p = dumbfile_getc(f);
if (!p) {
++row;
continue;
}
flags = p & 0xE0;
if (flags) {
++pattern->n_entries;
if (flags & 0x80)
dumbfile_skip(f, 2);
if (flags & 0x40)
dumbfile_skip(f, 2);
if (flags & 0x20)
dumbfile_skip(f, 1);
}
}
if (!pattern->n_entries)
return 0;
pattern->n_entries += nrows;
pattern->entry = malloc(pattern->n_entries * sizeof(*pattern->entry));
if (!pattern->entry)
return -1;
entry = pattern->entry;
row = 0;
dumbfile_seek(f, start, DFS_SEEK_SET);
while ((row < nrows) && !dumbfile_error(f) && (dumbfile_pos(f) < end)) {
p = dumbfile_getc(f);
if (!p) {
IT_SET_END_ROW(entry);
++entry;
++row;
continue;
}
flags = p;
entry->channel = flags & 0x1F;
entry->mask = 0;
if (flags & 0xE0) {
if (flags & 0x80) {
q = dumbfile_getc(f);
r = dumbfile_getc(f);
_dumb_it_xm_convert_effect(r, q, entry, 0);
}
if (flags & 0x40) {
q = dumbfile_getc(f);
r = dumbfile_getc(f);
if (q) {
entry->mask |= IT_ENTRY_INSTRUMENT;
entry->instrument = q;
}
if (r) {
entry->mask |= IT_ENTRY_NOTE;
entry->note = r - 1;
}
}
if (flags & 0x20) {
q = dumbfile_getc(f);
entry->mask |= IT_ENTRY_VOLPAN;
if (ver == 0)
entry->volpan = q;
else
entry->volpan = q * 64 / 127;
}
if (entry->mask)
entry++;
}
}
while (row < nrows) {
IT_SET_END_ROW(entry);
++entry;
++row;
}
pattern->n_entries = (int)(entry - pattern->entry);
if (!pattern->n_entries)
return -1;
return 0;
}
static DUMB_IT_SIGDATA *it_riff_amff_load_sigdata(DUMBFILE *f,
struct riff *stream) {
DUMB_IT_SIGDATA *sigdata;
int n, found;
int o, p;
if (!stream)
goto error;
if (stream->type != DUMB_ID('A', 'M', 'F', 'F'))
goto error;
sigdata = malloc(sizeof(*sigdata));
if (!sigdata)
goto error;
sigdata->n_patterns = 0;
sigdata->n_samples = 0;
sigdata->name[0] = 0;
found = 0;
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('M', 'A', 'I', 'N'):
/* initialization data */
if ((found & 1) || (c->size < 0x48))
goto error_sd;
found |= 1;
break;
case DUMB_ID('O', 'R', 'D', 'R'):
if ((found & 2) || (c->size < 1))
goto error_sd;
found |= 2;
break;
case DUMB_ID('P', 'A', 'T', 'T'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_sd;
o = dumbfile_getc(f);
if (o >= sigdata->n_patterns)
sigdata->n_patterns = (o + 1);
o = (int)dumbfile_igetl(f);
if ((unsigned)o + 5 > c->size)
goto error_sd;
break;
case DUMB_ID('I', 'N', 'S', 'T'): {
if (c->size < 0xE1)
goto error_sd;
if (dumbfile_seek(f, c->offset + 1, DFS_SEEK_SET))
goto error_sd;
o = dumbfile_getc(f);
if (o >= sigdata->n_samples)
sigdata->n_samples = (int)(o + 1);
if (c->size >= 0x121) {
if (dumbfile_seek(f, c->offset + 0xE1, DFS_SEEK_SET))
goto error_sd;
if (dumbfile_mgetl(f) == DUMB_ID('S', 'A', 'M', 'P')) {
size_t size = dumbfile_igetl(f);
if (size + 0xE1 + 8 > c->size)
goto error_sd;
}
}
} break;
}
}
if (found != 3 || !sigdata->n_samples || !sigdata->n_patterns)
goto error_sd;
if (sigdata->n_samples > 255 || sigdata->n_patterns > 255)
goto error_sd;
sigdata->song_message = NULL;
sigdata->order = NULL;
sigdata->instrument = NULL;
sigdata->sample = NULL;
sigdata->pattern = NULL;
sigdata->midi = NULL;
sigdata->checkpoint = NULL;
sigdata->mixing_volume = 48;
sigdata->pan_separation = 128;
sigdata->n_instruments = 0;
sigdata->n_orders = 0;
sigdata->restart_position = 0;
memset(sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS);
for (n = 0; n < DUMB_IT_N_CHANNELS; n += 4) {
int sep = 32 * dumb_it_default_panning_separation / 100;
sigdata->channel_pan[n] = 32 - sep;
sigdata->channel_pan[n + 1] = 32 + sep;
sigdata->channel_pan[n + 2] = 32 + sep;
sigdata->channel_pan[n + 3] = 32 - sep;
}
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('M', 'A', 'I', 'N'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
dumbfile_getnc((char *)sigdata->name, 64, f);
sigdata->name[64] = 0;
sigdata->flags =
IT_STEREO | IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_WAS_AN_S3M;
o = dumbfile_getc(f);
if (!(o & 1))
sigdata->flags |= IT_LINEAR_SLIDES;
if ((o & ~3) || !(o & 2))
goto error_usd; // unknown flags
sigdata->n_pchannels = dumbfile_getc(f);
sigdata->speed = dumbfile_getc(f);
sigdata->tempo = dumbfile_getc(f);
dumbfile_skip(f, 4); // min period, max period, 16x amiga periods, often invalid
sigdata->global_volume = dumbfile_getc(f);
if (c->size < 0x48 + (unsigned)sigdata->n_pchannels)
goto error_usd;
for (o = 0; o < sigdata->n_pchannels; ++o) {
p = dumbfile_getc(f);
sigdata->channel_pan[o] = p;
if (p >= 128) {
sigdata->channel_volume[o] = 0;
}
}
break;
}
}
sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));
if (!sigdata->pattern)
goto error_usd;
for (n = 0; n < sigdata->n_patterns; ++n)
sigdata->pattern[n].entry = NULL;
sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));
if (!sigdata->sample)
goto error_usd;
for (n = 0; n < sigdata->n_samples; ++n) {
IT_SAMPLE *sample = sigdata->sample + n;
sample->data = NULL;
sample->flags = 0;
sample->name[0] = 0;
}
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('O', 'R', 'D', 'R'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
sigdata->n_orders = dumbfile_getc(f) + 1;
if ((unsigned)sigdata->n_orders + 1 > c->size)
goto error_usd;
sigdata->order = malloc(sigdata->n_orders);
if (!sigdata->order)
goto error_usd;
dumbfile_getnc((char *)sigdata->order, sigdata->n_orders, f);
break;
case DUMB_ID('P', 'A', 'T', 'T'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
o = dumbfile_getc(f);
p = (int)dumbfile_igetl(f);
if (it_riff_am_process_pattern(sigdata->pattern + o, f, p, 0))
goto error_usd;
break;
case DUMB_ID('I', 'N', 'S', 'T'): {
IT_SAMPLE *sample;
if (dumbfile_seek(f, c->offset + 1, DFS_SEEK_SET))
goto error_usd;
sample = sigdata->sample + dumbfile_getc(f);
if (c->size >= 0x121) {
if (dumbfile_seek(f, c->offset + 0xE1, DFS_SEEK_SET))
goto error_usd;
if (dumbfile_mgetl(f) == DUMB_ID('S', 'A', 'M', 'P')) {
size_t size = dumbfile_igetl(f);
if (it_riff_am_process_sample(sample, f, size, 0))
goto error_usd;
break;
}
}
dumbfile_seek(f, c->offset + 2, DFS_SEEK_SET);
dumbfile_getnc((char *)sample->name, 28, f);
sample->name[28] = 0;
} break;
}
}
if (_dumb_it_fix_invalid_orders(sigdata) < 0) {
_dumb_it_unload_sigdata(sigdata);
return NULL;
}
return sigdata;
error_usd:
_dumb_it_unload_sigdata(sigdata);
goto error;
error_sd:
free(sigdata);
error:
return NULL;
}
static DUMB_IT_SIGDATA *it_riff_am_load_sigdata(DUMBFILE *f,
struct riff *stream) {
DUMB_IT_SIGDATA *sigdata;
int n, found;
int o, p;
if (!f || !stream)
goto error;
if (stream->type != DUMB_ID('A', 'M', ' ', ' '))
goto error;
sigdata = malloc(sizeof(*sigdata));
if (!sigdata)
goto error;
sigdata->n_patterns = 0;
sigdata->n_samples = 0;
sigdata->name[0] = 0;
found = 0;
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('I', 'N', 'I', 'T'):
/* initialization data */
if ((found & 1) || (c->size < 0x48))
goto error_sd;
found |= 1;
break;
case DUMB_ID('O', 'R', 'D', 'R'):
if ((found & 2) || (c->size < 1))
goto error_sd;
found |= 2;
break;
case DUMB_ID('P', 'A', 'T', 'T'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_sd;
o = dumbfile_getc(f);
if (o >= sigdata->n_patterns)
sigdata->n_patterns = (int)(o + 1);
o = (int)dumbfile_igetl(f);
if ((unsigned)o + 5 > c->size)
goto error_sd;
break;
case DUMB_ID('R', 'I', 'F', 'F'): {
struct riff *str = c->nested;
switch (str->type) {
case DUMB_ID('A', 'I', ' ', ' '):
for (o = 0; (unsigned)o < str->chunk_count; ++o) {
struct riff_chunk *chk = str->chunks + o;
switch (chk->type) {
case DUMB_ID('I', 'N', 'S', 'T'): {
struct riff *temp;
size_t size;
unsigned sample_found;
if (dumbfile_seek(f, chk->offset, DFS_SEEK_SET))
goto error_sd;
size = dumbfile_igetl(f);
if (size < 0x142)
goto error_sd;
sample_found = 0;
dumbfile_skip(f, 1);
p = dumbfile_getc(f);
if (p >= sigdata->n_samples)
sigdata->n_samples = (int)(p + 1);
temp = riff_parse(f, chk->offset + 4 + size,
chk->size - size - 4, 1);
if (temp) {
if (temp->type == DUMB_ID('A', 'S', ' ', ' ')) {
for (p = 0; (unsigned)p < temp->chunk_count;
++p) {
if (temp->chunks[p].type ==
DUMB_ID('S', 'A', 'M', 'P')) {
if (sample_found) {
riff_free(temp);
goto error_sd;
}
sample_found = 1;
}
}
}
riff_free(temp);
}
}
}
}
}
} break;
}
}
if (found != 3 || !sigdata->n_samples || !sigdata->n_patterns)
goto error_sd;
if (sigdata->n_samples > 255 || sigdata->n_patterns > 255)
goto error_sd;
sigdata->song_message = NULL;
sigdata->order = NULL;
sigdata->instrument = NULL;
sigdata->sample = NULL;
sigdata->pattern = NULL;
sigdata->midi = NULL;
sigdata->checkpoint = NULL;
sigdata->mixing_volume = 48;
sigdata->pan_separation = 128;
sigdata->n_instruments = 0;
sigdata->n_orders = 0;
sigdata->restart_position = 0;
memset(sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS);
for (n = 0; n < DUMB_IT_N_CHANNELS; n += 4) {
int sep = 32 * dumb_it_default_panning_separation / 100;
sigdata->channel_pan[n] = 32 - sep;
sigdata->channel_pan[n + 1] = 32 + sep;
sigdata->channel_pan[n + 2] = 32 + sep;
sigdata->channel_pan[n + 3] = 32 - sep;
}
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('I', 'N', 'I', 'T'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
dumbfile_getnc((char *)sigdata->name, 64, f);
sigdata->name[64] = 0;
sigdata->flags =
IT_STEREO | IT_OLD_EFFECTS | IT_COMPATIBLE_GXX | IT_WAS_AN_S3M;
o = dumbfile_getc(f);
if (!(o & 1))
sigdata->flags |= IT_LINEAR_SLIDES;
if ((o & ~3) || !(o & 2))
goto error_usd; // unknown flags
sigdata->n_pchannels = dumbfile_getc(f);
sigdata->speed = dumbfile_getc(f);
sigdata->tempo = dumbfile_getc(f);
dumbfile_skip(f, 4);
sigdata->global_volume = dumbfile_getc(f);
if (c->size < 0x48 + (unsigned)sigdata->n_pchannels)
goto error_usd;
for (o = 0; o < sigdata->n_pchannels; ++o) {
p = dumbfile_getc(f);
if (p <= 128) {
sigdata->channel_pan[o] = p / 2;
} else {
sigdata->channel_volume[o] = 0;
}
}
break;
}
}
sigdata->pattern = malloc(sigdata->n_patterns * sizeof(*sigdata->pattern));
if (!sigdata->pattern)
goto error_usd;
for (n = 0; n < sigdata->n_patterns; ++n)
sigdata->pattern[n].entry = NULL;
sigdata->sample = malloc(sigdata->n_samples * sizeof(*sigdata->sample));
if (!sigdata->sample)
goto error_usd;
for (n = 0; n < sigdata->n_samples; ++n) {
IT_SAMPLE *sample = sigdata->sample + n;
sample->data = NULL;
sample->flags = 0;
sample->name[0] = 0;
}
for (n = 0; (unsigned)n < stream->chunk_count; ++n) {
struct riff_chunk *c = stream->chunks + n;
switch (c->type) {
case DUMB_ID('O', 'R', 'D', 'R'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
sigdata->n_orders = dumbfile_getc(f) + 1;
if ((unsigned)sigdata->n_orders + 1 > c->size)
goto error_usd;
sigdata->order = malloc(sigdata->n_orders);
if (!sigdata->order)
goto error_usd;
dumbfile_getnc((char *)sigdata->order, sigdata->n_orders, f);
break;
case DUMB_ID('P', 'A', 'T', 'T'):
if (dumbfile_seek(f, c->offset, DFS_SEEK_SET))
goto error_usd;
o = dumbfile_getc(f);
p = (int)dumbfile_igetl(f);
if (it_riff_am_process_pattern(sigdata->pattern + o, f, p, 1))
goto error_usd;
break;
case DUMB_ID('R', 'I', 'F', 'F'): {
struct riff *str = c->nested;
switch (str->type) {
case DUMB_ID('A', 'I', ' ', ' '):
for (o = 0; (unsigned)o < str->chunk_count; ++o) {
struct riff_chunk *chk = str->chunks + o;
switch (chk->type) {
case DUMB_ID('I', 'N', 'S', 'T'): {
struct riff *temp;
size_t size;
unsigned sample_found;
IT_SAMPLE *sample;
if (dumbfile_seek(f, chk->offset, DFS_SEEK_SET))
goto error_usd;
size = dumbfile_igetl(f);
dumbfile_skip(f, 1);
p = dumbfile_getc(f);
temp = riff_parse(f, chk->offset + 4 + size,
chk->size - size - 4, 1);
sample_found = 0;
sample = sigdata->sample + p;
if (temp) {
if (temp->type == DUMB_ID('A', 'S', ' ', ' ')) {
for (p = 0; (unsigned)p < temp->chunk_count;
++p) {
struct riff_chunk *c = temp->chunks + p;
if (c->type ==
DUMB_ID('S', 'A', 'M', 'P')) {
if (sample_found) {
riff_free(temp);
goto error_usd;
}
if (dumbfile_seek(f, c->offset,
DFS_SEEK_SET)) {
riff_free(temp);
goto error_usd;
}
if (it_riff_am_process_sample(
sample, f, c->size, 1)) {
riff_free(temp);
goto error_usd;
}
sample_found = 1;
}
}
}
riff_free(temp);
}
if (!sample_found) {
dumbfile_seek(f, chk->offset + 6, DFS_SEEK_SET);
dumbfile_getnc((char *)sample->name, 32, f);
sample->name[32] = 0;
}
}
}
}
}
} break;
}
}
_dumb_it_fix_invalid_orders(sigdata);
return sigdata;
error_usd:
_dumb_it_unload_sigdata(sigdata);
goto error;
error_sd:
free(sigdata);
error:
return NULL;
}
DUH *dumb_read_riff_amff(DUMBFILE *f, struct riff *stream) {
sigdata_t *sigdata;
long length;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
sigdata = it_riff_amff_load_sigdata(f, stream);
if (!sigdata)
return NULL;
length = 0; /*_dumb_it_build_checkpoints(sigdata, 0);*/
{
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] = "RIFF AMFF";
return make_duh(length, 2, (const char *const(*)[2])tag, 1, &descptr,
&sigdata);
}
}
DUH *dumb_read_riff_am(DUMBFILE *f, struct riff *stream) {
sigdata_t *sigdata;
DUH_SIGTYPE_DESC *descptr = &_dumb_sigtype_it;
sigdata = it_riff_am_load_sigdata(f, stream);
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] = "RIFF AM";
return make_duh(-1, 2, (const char *const(*)[2])tag, 1, &descptr,
&sigdata);
}
}