kolibrios/programs/media/ac97snd/trunk/mp3dec/l3dec.c
heavyiron 3eda462807 Kernel: Smoothing image code from Mario79, build scripts for skin and drivers/build.bat
Programs: fasm updated to 1.67.14, small fixes in desktop, stackcfg, calc, board, pipes, freecell, big cleanup of unused programs, added some applications from 0.6.3.0 distr...

git-svn-id: svn://kolibrios.org@205 a494cfbc-eb01-0410-851d-a64ba20cac60
2006-11-02 14:18:23 +00:00

351 lines
10 KiB
C

#include "layer3.h"
#include <string.h>
#include <math.h>
#ifndef min
#define max(a,b) (((a) > (b)) ? (a) : (b))
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif
extern int m_frame_size, m_pcm_size;
// shared
SAMPLE m_sample[2][2][576];//- sample union of int/float sample[ch][gr][576]
int m_nsb_limit;
SBT_PROC m_sbt_proc;
XFORM_PROC m_xform_proc;
int m_channels; //(mode == 3) ? 1 : 2
int m_ms_mode, m_is_mode;
int m_sfBandIndex[2][22];// [long/short][cb]
int m_nBand[2][22];
int m_band_limit;
int m_band_limit21; // limit for sf band 21
int m_band_limit12; // limit for sf band 12 short
int m_band_limit_nsb;
int m_ncbl_mixed;
SIDE_INFO m_side_info;
SCALE_FACTOR m_scale_fac[2][2]; // [gr][ch]
CB_INFO m_cb_info[2][2]; // [gr][ch]
IS_SF_INFO m_is_sf_info;
#define NBUF (8*1024)
#define BUF_TRIGGER (NBUF-1500)
int m_gr;
int m_main_pos_bit;
byte m_buf[NBUF];
int m_buf_ptr0, m_buf_ptr1;
int m_nsamp[2][2]; // must start = 0, for m_nsamp[igr_prev]
float m_yout[576]; // hybrid out, sbt in
//extern "l3side.c"
int L3get_side_info1();
int L3get_side_info2(int gr);
//extern "l3sf.c"
void L3get_scale_factor1(int gr, int ch);
void L3get_scale_factor2(int gr, int ch);
void huffman(void *xy, int n, int ntable);
int huffman_quad(void *vwxy, int n, int nbits, int ntable);
void dequant(SAMPLE sample[], int gr, int ch);
void antialias(void *x, int n);
void ms_process(void *x, int n);
void is_process1(void *x, SCALE_FACTOR* sf,
CB_INFO cb_info[2], int nsamp);
void is_process2(void *x, SCALE_FACTOR * sf,
CB_INFO cb_info[2], int nsamp);
//extern "l3hybrid.c"
int hybrid(void *xin, void *xprev, float *y,
int btype, int nlong, int ntot, int nprev);
int hybrid_sum(void *xin, void *xin_left, float *y,
int btype, int nlong, int ntot);
void sum_f_bands(void *a, void *b, int n);
void freq_invert(float *y, int n); /* xform, */
void L3decode_main(MPEG_HEADER* h, byte *pcm, int gr);
void L3decode_reset()
{
m_buf_ptr0 = m_buf_ptr1 = 0;
}
void L3decode_frame(MPEG_HEADER* h, byte* mpeg, byte* pcm)
{
int crc_size, side_size;
int copy_size;
if (h->mode == 1) {
m_ms_mode = h->mode_ext >> 1;
m_is_mode = h->mode_ext & 1;
}
else {
m_ms_mode = 0;
m_is_mode = 0;
}
crc_size = (h->error_prot) ? 2 : 0;
bitget_init(mpeg + 4 + crc_size);
if (h->version == 1)
side_size = L3get_side_info1();
else
side_size = L3get_side_info2(m_gr);
m_buf_ptr0 = m_buf_ptr1 - m_side_info.main_data_begin;/* decode start point */
if (m_buf_ptr1 > BUF_TRIGGER) { /* shift buffer */
memmove(m_buf, m_buf + m_buf_ptr0, m_side_info.main_data_begin);
m_buf_ptr0 = 0;
m_buf_ptr1 = m_side_info.main_data_begin;
}
copy_size = m_frame_size - (4 + crc_size + side_size);
//24/02/02 X-MaD
if (copy_size < 0) { copy_size = copy_size * -1; }
//if (copy_size < 0) { copy_size = 0; }
//__try {
memmove(m_buf + m_buf_ptr1, mpeg + (4 + crc_size + side_size), copy_size);
//} __except(0){
// m_buf_ptr1 = 0;
//}
m_buf_ptr1 += copy_size;
//24/02/02 X-MaD
if (m_buf_ptr0 >= 0) {
m_main_pos_bit = m_buf_ptr0 << 3;
if (h->version == 1) {
L3decode_main(h, pcm, 0);
L3decode_main(h, pcm + (m_pcm_size / 2), 1);
}
else {
L3decode_main(h, pcm, m_gr);
m_gr = m_gr ^ 1;
}
}
}
void L3decode_main(MPEG_HEADER* h, byte *pcm, int gr)
{
int ch;
int n1, n2, n3, n4, nn2, nn3, nn4;
int bit0, qbits, m0;
for (ch = 0; ch < m_channels; ch ++) {
bitget_init(m_buf + (m_main_pos_bit >> 3));
bit0 = (m_main_pos_bit & 7);
if (bit0) bitget(bit0);
m_main_pos_bit += m_side_info.gr[gr][ch].part2_3_length;
bitget_init_end(m_buf + ((m_main_pos_bit + 39) >> 3));
// scale factors
if (h->version == 1)
L3get_scale_factor1(gr, ch);
else
L3get_scale_factor2(gr, ch);
// huff data
n1 = m_sfBandIndex[0][m_side_info.gr[gr][ch].region0_count];
n2 = m_sfBandIndex[0][m_side_info.gr[gr][ch].region0_count
+ m_side_info.gr[gr][ch].region1_count + 1];
n3 = m_side_info.gr[gr][ch].big_values;
n3 = n3 + n3;
if (n3 > m_band_limit) n3 = m_band_limit;
if (n2 > n3) n2 = n3;
if (n1 > n3) n1 = n3;
nn3 = n3 - n2;
nn2 = n2 - n1;
huffman(m_sample[ch][gr], n1, m_side_info.gr[gr][ch].table_select[0]);
huffman(m_sample[ch][gr] + n1, nn2, m_side_info.gr[gr][ch].table_select[1]);
huffman(m_sample[ch][gr] + n2, nn3, m_side_info.gr[gr][ch].table_select[2]);
qbits = m_side_info.gr[gr][ch].part2_3_length - (bitget_bits_used() - bit0);
nn4 = huffman_quad(m_sample[ch][gr] + n3, m_band_limit - n3, qbits,
m_side_info.gr[gr][ch].count1table_select);
n4 = n3 + nn4;
m_nsamp[gr][ch] = n4;
// limit n4 or allow deqaunt to sf band 22
if (m_side_info.gr[gr][ch].block_type == 2)
n4 = min(n4, m_band_limit12);
else
n4 = min(n4, m_band_limit21);
if (n4 < 576)
memset(m_sample[ch][gr] + n4, 0, sizeof(SAMPLE) * (576 - n4));
if (bitget_overrun())
memset(m_sample[ch][gr], 0, sizeof(SAMPLE) * (576));
}
// dequant
for (ch = 0; ch < m_channels; ch++) {
dequant(m_sample[ch][gr], gr, ch);
}
// ms stereo processing
if (m_ms_mode) {
if (m_is_mode == 0) {
m0 = m_nsamp[gr][0]; // process to longer of left/right
if (m0 < m_nsamp[gr][1])
m0 = m_nsamp[gr][1];
}
else {// process to last cb in right
m0 = m_sfBandIndex[m_cb_info[gr][1].cbtype][m_cb_info[gr][1].cbmax];
}
ms_process(m_sample[0][gr], m0);
}
// is stereo processing
if (m_is_mode) {
if (h->version == 1)
is_process1(m_sample[0][gr], &m_scale_fac[gr][1],
m_cb_info[gr], m_nsamp[gr][0]);
else
is_process2(m_sample[0][gr], &m_scale_fac[gr][1],
m_cb_info[gr], m_nsamp[gr][0]);
}
// adjust ms and is modes to max of left/right
if (m_ms_mode || m_is_mode) {
if (m_nsamp[gr][0] < m_nsamp[gr][1])
m_nsamp[gr][0] = m_nsamp[gr][1];
else
m_nsamp[gr][1] = m_nsamp[gr][0];
}
// antialias
for (ch = 0; ch < m_channels; ch ++) {
if (m_cb_info[gr][ch].ncbl == 0)
continue; // have no long blocks
if (m_side_info.gr[gr][ch].mixed_block_flag)
n1 = 1; // 1 -> 36 samples
else
n1 = (m_nsamp[gr][ch] + 7) / 18;
if (n1 > 31)
n1 = 31;
antialias(m_sample[ch][gr], n1);
n1 = 18 * n1 + 8; // update number of samples
if (n1 > m_nsamp[gr][ch])
m_nsamp[gr][ch] = n1;
}
// hybrid + sbt
m_xform_proc(pcm, gr);
}
void xform_mono(void *pcm, int igr)
{
int igr_prev, n1, n2;
// hybrid + sbt
n1 = n2 = m_nsamp[igr][0]; // total number bands
if (m_side_info.gr[igr][0].block_type == 2) { // long bands
if (m_side_info.gr[igr][0].mixed_block_flag)
n1 = m_sfBandIndex[0][m_ncbl_mixed - 1];
else
n1 = 0;
}
if (n1 > m_band_limit)
n1 = m_band_limit;
if (n2 > m_band_limit)
n2 = m_band_limit;
igr_prev = igr ^ 1;
m_nsamp[igr][0] = hybrid(m_sample[0][igr], m_sample[0][igr_prev],
m_yout, m_side_info.gr[igr][0].block_type, n1, n2, m_nsamp[igr_prev][0]);
freq_invert(m_yout, m_nsamp[igr][0]);
m_sbt_proc(m_yout, pcm, 0);
}
void xform_dual_right(void *pcm, int igr)
{
int igr_prev, n1, n2;
// hybrid + sbt
n1 = n2 = m_nsamp[igr][1]; // total number bands
if (m_side_info.gr[igr][1].block_type == 2) { // long bands
if (m_side_info.gr[igr][1].mixed_block_flag)
n1 = m_sfBandIndex[0][m_ncbl_mixed - 1];
else
n1 = 0;
}
if (n1 > m_band_limit)
n1 = m_band_limit;
if (n2 > m_band_limit)
n2 = m_band_limit;
igr_prev = igr ^ 1;
m_nsamp[igr][1] = hybrid(m_sample[1][igr], m_sample[1][igr_prev],
m_yout, m_side_info.gr[igr][1].block_type, n1, n2, m_nsamp[igr_prev][1]);
freq_invert(m_yout, m_nsamp[igr][1]);
m_sbt_proc(m_yout, pcm, 0);
}
void xform_dual(void *pcm, int igr)
{
int ch;
int igr_prev, n1, n2;
// hybrid + sbt
igr_prev = igr ^ 1;
for (ch = 0; ch < m_channels; ch++) {
n1 = n2 = m_nsamp[igr][ch]; // total number bands
if (m_side_info.gr[igr][ch].block_type == 2) { // long bands
if (m_side_info.gr[igr][ch].mixed_block_flag)
n1 = m_sfBandIndex[0][m_ncbl_mixed - 1];
else
n1 = 0;
}
if (n1 > m_band_limit)
n1 = m_band_limit;
if (n2 > m_band_limit)
n2 = m_band_limit;
m_nsamp[igr][ch] = hybrid(m_sample[ch][igr], m_sample[ch][igr_prev],
m_yout, m_side_info.gr[igr][ch].block_type, n1, n2, m_nsamp[igr_prev][ch]);
freq_invert(m_yout, m_nsamp[igr][ch]);
m_sbt_proc(m_yout, pcm, ch);
}
}
void xform_dual_mono(void *pcm, int igr)
{
int igr_prev, n1, n2, n3;
// hybrid + sbt
igr_prev = igr ^ 1;
if ((m_side_info.gr[igr][0].block_type == m_side_info.gr[igr][1].block_type)
&& (m_side_info.gr[igr][0].mixed_block_flag == 0)
&& (m_side_info.gr[igr][1].mixed_block_flag == 0)) {
n2 = m_nsamp[igr][0]; // total number bands max of L R
if (n2 < m_nsamp[igr][1])
n2 = m_nsamp[igr][1];
if (n2 > m_band_limit)
n2 = m_band_limit;
if (m_side_info.gr[igr][0].block_type == 2)
n1 = 0;
else
n1 = n2; // n1 = number long bands
sum_f_bands(m_sample[0][igr], m_sample[1][igr], n2);
n3 = m_nsamp[igr][0] = hybrid(m_sample[0][igr], m_sample[0][igr_prev],
m_yout, m_side_info.gr[igr][0].block_type, n1, n2, m_nsamp[igr_prev][0]);
}
else { // transform and then sum (not tested - never happens in test)
// left chan
n1 = n2 = m_nsamp[igr][0]; // total number bands
if (m_side_info.gr[igr][0].block_type == 2) { // long bands
if (m_side_info.gr[igr][0].mixed_block_flag)
n1 = m_sfBandIndex[0][m_ncbl_mixed - 1];
else
n1 = 0;
}
n3 = m_nsamp[igr][0] = hybrid(m_sample[0][igr], m_sample[0][igr_prev],
m_yout, m_side_info.gr[igr][0].block_type, n1, n2, m_nsamp[igr_prev][0]);
// right chan
n1 = n2 = m_nsamp[igr][1]; // total number bands
if (m_side_info.gr[igr][1].block_type == 2) { // long bands
if (m_side_info.gr[igr][1].mixed_block_flag)
n1 = m_sfBandIndex[0][m_ncbl_mixed - 1];
else
n1 = 0;
}
m_nsamp[igr][1] = hybrid_sum(m_sample[1][igr], m_sample[0][igr],
m_yout, m_side_info.gr[igr][1].block_type, n1, n2);
if (n3 < m_nsamp[igr][1])
n1 = m_nsamp[igr][1];
}
freq_invert(m_yout, n3);
m_sbt_proc(m_yout, pcm, 0);
}