static int
I_step_one(PMPSTR mp, sideinfo_layer_I* si)
{
struct frame *fr = &(mp->fr);
int jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext << 2) + 4 : 32;
int i;
int illegal_value_detected = 0;
unsigned char const ba15 = 15; /* bit pattern not allowed, looks like sync(?) */
memset(si, 0, sizeof(*si));
assert(fr->stereo == 1 || fr->stereo == 2);
if (fr->stereo == 2) {
for (i = 0; i < jsbound; i++) {
unsigned char b0 = get_leq_8_bits(mp, 4); /* values 0-15 */
unsigned char b1 = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b0;
si->allocation[i][1] = b1;
if (b0 == ba15 || b1 == ba15)
illegal_value_detected = 1;
}
for (i = jsbound; i < SBLIMIT; i++) {
unsigned char b = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b;
si->allocation[i][1] = b;
if (b == ba15)
illegal_value_detected = 1;
}
for (i = 0; i < SBLIMIT; i++) {
unsigned char n0 = si->allocation[i][0];
unsigned char n1 = si->allocation[i][1];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
unsigned char b1 = n1 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
si->scalefactor[i][0] = b0;
si->scalefactor[i][1] = b1;
}
}
else {
for (i = 0; i < SBLIMIT; i++) {
unsigned char b0 = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b0;
if (b0 == ba15)
illegal_value_detected = 1;
}
for (i = 0; i < SBLIMIT; i++) {
unsigned char n0 = si->allocation[i][0];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
si->scalefactor[i][0] = b0;
}
}
return illegal_value_detected;
}
static void
I_step_one(PMPSTR mp, sideinfo_layer_I* si)
{
struct frame *fr = &(mp->fr);
int jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext << 2) + 4 : 32;
int i;
memset(si, 0, sizeof(*si));
assert(fr->stereo == 1 || fr->stereo == 2);
if (fr->stereo == 2) {
for (i = 0; i < jsbound; i++) {
unsigned char b0 = get_leq_8_bits(mp, 4); /* values 0-15 */
unsigned char b1 = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b0;
si->allocation[i][1] = b1;
}
for (i = jsbound; i < SBLIMIT; i++) {
unsigned char b = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b;
si->allocation[i][1] = b;
}
for (i = 0; i < SBLIMIT; i++) {
unsigned char n0 = si->allocation[i][0];
unsigned char n1 = si->allocation[i][1];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
unsigned char b1 = n1 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
si->scalefactor[i][0] = b0;
si->scalefactor[i][1] = b1;
}
}
else {
for (i = 0; i < SBLIMIT; i++) {
unsigned char b0 = get_leq_8_bits(mp, 4); /* values 0-15 */
si->allocation[i][0] = b0;
}
for (i = 0; i < SBLIMIT; i++) {
unsigned char n0 = si->allocation[i][0];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 6) : 0; /* values 0-63 */
si->scalefactor[i][0] = b0;
}
}
}
static void
II_step_one(PMPSTR mp, sideinfo_layer_II *si, struct frame *fr)
{
int nch = fr->stereo;
int sblimit = fr->II_sblimit;
int jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext << 2) + 4 : fr->II_sblimit;
struct al_table2 const *alloc1 = fr->alloc;
unsigned char scfsi[SBLIMIT][2];
int i, ch;
memset(si, 0, sizeof(*si));
if (nch == 2) {
for (i = 0; i < jsbound; ++i) {
short step = alloc1->bits;
unsigned char b0 = get_leq_8_bits(mp, step);
unsigned char b1 = get_leq_8_bits(mp, step);
alloc1 += ((size_t)1 << step);
si->allocation[i][0] = b0;
si->allocation[i][1] = b1;
}
for (i = jsbound; i < sblimit; ++i) {
short step = alloc1->bits;
unsigned char b0 = get_leq_8_bits(mp, step);
alloc1 += ((size_t)1 << step);
si->allocation[i][0] = b0;
si->allocation[i][1] = b0;
}
for (i = 0; i < sblimit; ++i) {
unsigned char n0 = si->allocation[i][0];
unsigned char n1 = si->allocation[i][1];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 2) : 0;
unsigned char b1 = n1 ? get_leq_8_bits(mp, 2) : 0;
scfsi[i][0] = b0;
scfsi[i][1] = b1;
}
}
else { /* mono */
for (i = 0; i < sblimit; ++i) {
short step = alloc1->bits;
unsigned char b0 = get_leq_8_bits(mp, step);
alloc1 += ((size_t)1 << step);
si->allocation[i][0] = b0;
}
for (i = 0; i < sblimit; ++i) {
unsigned char n0 = si->allocation[i][0];
unsigned char b0 = n0 ? get_leq_8_bits(mp, 2) : 0;
scfsi[i][0] = b0;
}
}
for (i = 0; i < sblimit; ++i) {
for (ch = 0; ch < nch; ++ch) {
unsigned char s0 = 0, s1 = 0, s2 = 0;
if (si->allocation[i][ch]) {
switch (scfsi[i][ch]) {
case 0:
s0 = get_leq_8_bits(mp, 6);
s1 = get_leq_8_bits(mp, 6);
s2 = get_leq_8_bits(mp, 6);
break;
case 1:
s0 = get_leq_8_bits(mp, 6);
s1 = s0;
s2 = get_leq_8_bits(mp, 6);
break;
case 2:
s0 = get_leq_8_bits(mp, 6);
s1 = s0;
s2 = s0;
break;
case 3:
s0 = get_leq_8_bits(mp, 6);
s1 = get_leq_8_bits(mp, 6);
s2 = s1;
break;
default:
assert(0);
}
}
si->scalefactor[i][ch][0] = s0;
si->scalefactor[i][ch][1] = s1;
si->scalefactor[i][ch][2] = s2;
}
}
}
