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imc: some cosmetics

tags/n1.0
Kostya Shishkov 13 years ago
parent
177bcc9593
commit
d073f122ea
1 changed files with 204 additions and 181 deletions
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  1. +204
    -181
      libavcodec/imc.c

+ 204
- 181
libavcodec/imc.c View File

@@ -89,7 +89,7 @@ typedef struct {

DSPContext dsp;
FFTContext fft;
DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS/2];
DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2];
float *out_samples;
} IMCContext;

@@ -99,11 +99,12 @@ static VLC huffman_vlc[4][4];

static const int vlc_offsets[17] = {
0, 640, 1156, 1732, 2308, 2852, 3396, 3924,
4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE};
4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE
};

static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2];

static av_cold int imc_decode_init(AVCodecContext * avctx)
static av_cold int imc_decode_init(AVCodecContext *avctx)
{
int i, j, ret;
IMCContext *q = avctx->priv_data;
@@ -116,27 +117,24 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)

q->decoder_reset = 1;

for(i = 0; i < BANDS; i++)
for (i = 0; i < BANDS; i++)
q->old_floor[i] = 1.0;

/* Build mdct window, a simple sine window normalized with sqrt(2) */
ff_sine_window_init(q->mdct_sine_window, COEFFS);
for(i = 0; i < COEFFS; i++)
for (i = 0; i < COEFFS; i++)
q->mdct_sine_window[i] *= sqrt(2.0);
for(i = 0; i < COEFFS/2; i++){
for (i = 0; i < COEFFS / 2; i++) {
q->post_cos[i] = (1.0f / 32768) * cos(i / 256.0 * M_PI);
q->post_sin[i] = (1.0f / 32768) * sin(i / 256.0 * M_PI);

r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI);
r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI);

if (i & 0x1)
{
if (i & 0x1) {
q->pre_coef1[i] = (r1 + r2) * sqrt(2.0);
q->pre_coef2[i] = -(r1 - r2) * sqrt(2.0);
}
else
{
} else {
q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0);
q->pre_coef2[i] = (r1 - r2) * sqrt(2.0);
}
@@ -146,13 +144,12 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)

/* Generate a square root table */

for(i = 0; i < 30; i++) {
for (i = 0; i < 30; i++)
q->sqrt_tab[i] = sqrt(i);
}

/* initialize the VLC tables */
for(i = 0; i < 4 ; i++) {
for(j = 0; j < 4; j++) {
for (i = 0; i < 4 ; i++) {
for (j = 0; j < 4; j++) {
huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]];
huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j];
init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i],
@@ -160,7 +157,7 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
}
}
q->one_div_log2 = 1/log(2);
q->one_div_log2 = 1 / log(2);

if ((ret = ff_fft_init(&q->fft, 7, 1))) {
av_log(avctx, AV_LOG_INFO, "FFT init failed\n");
@@ -176,8 +173,9 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
return 0;
}

static void imc_calculate_coeffs(IMCContext* q, float* flcoeffs1, float* flcoeffs2, int* bandWidthT,
float* flcoeffs3, float* flcoeffs5)
static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1,
float *flcoeffs2, int *bandWidthT,
float *flcoeffs3, float *flcoeffs5)
{
float workT1[BANDS];
float workT2[BANDS];
@@ -186,13 +184,13 @@ static void imc_calculate_coeffs(IMCContext* q, float* flcoeffs1, float* flcoeff
float accum = 0.0;
int i, cnt2;

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
flcoeffs5[i] = workT2[i] = 0.0;
if (bandWidthT[i]){
if (bandWidthT[i]) {
workT1[i] = flcoeffs1[i] * flcoeffs1[i];
flcoeffs3[i] = 2.0 * flcoeffs2[i];
} else {
workT1[i] = 0.0;
workT1[i] = 0.0;
flcoeffs3[i] = -30000.0;
}
workT3[i] = bandWidthT[i] * workT1[i] * 0.01;
@@ -200,37 +198,38 @@ static void imc_calculate_coeffs(IMCContext* q, float* flcoeffs1, float* flcoeff
workT3[i] = 0.0;
}

for(i = 0; i < BANDS; i++) {
for(cnt2 = i; cnt2 < cyclTab[i]; cnt2++)
for (i = 0; i < BANDS; i++) {
for (cnt2 = i; cnt2 < cyclTab[i]; cnt2++)
flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i];
workT2[cnt2-1] = workT2[cnt2-1] + workT3[i];
workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i];
}

for(i = 1; i < BANDS; i++) {
accum = (workT2[i-1] + accum) * imc_weights1[i-1];
for (i = 1; i < BANDS; i++) {
accum = (workT2[i - 1] + accum) * imc_weights1[i - 1];
flcoeffs5[i] += accum;
}

for(i = 0; i < BANDS; i++)
for (i = 0; i < BANDS; i++)
workT2[i] = 0.0;

for(i = 0; i < BANDS; i++) {
for(cnt2 = i-1; cnt2 > cyclTab2[i]; cnt2--)
for (i = 0; i < BANDS; i++) {
for (cnt2 = i - 1; cnt2 > cyclTab2[i]; cnt2--)
flcoeffs5[cnt2] += workT3[i];
workT2[cnt2+1] += workT3[i];
}

accum = 0.0;

for(i = BANDS-2; i >= 0; i--) {
for (i = BANDS-2; i >= 0; i--) {
accum = (workT2[i+1] + accum) * imc_weights2[i];
flcoeffs5[i] += accum;
//there is missing code here, but it seems to never be triggered
// there is missing code here, but it seems to never be triggered
}
}


static void imc_read_level_coeffs(IMCContext* q, int stream_format_code, int* levlCoeffs)
static void imc_read_level_coeffs(IMCContext *q, int stream_format_code,
int *levlCoeffs)
{
int i;
VLC *hufftab[4];
@@ -245,41 +244,42 @@ static void imc_read_level_coeffs(IMCContext* q, int stream_format_code, int* le
hufftab[3] = &huffman_vlc[s][3];
cb_sel = imc_cb_select[s];

if(stream_format_code & 4)
if (stream_format_code & 4)
start = 1;
if(start)
if (start)
levlCoeffs[0] = get_bits(&q->gb, 7);
for(i = start; i < BANDS; i++){
levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table, hufftab[cb_sel[i]]->bits, 2);
if(levlCoeffs[i] == 17)
for (i = start; i < BANDS; i++) {
levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table,
hufftab[cb_sel[i]]->bits, 2);
if (levlCoeffs[i] == 17)
levlCoeffs[i] += get_bits(&q->gb, 4);
}
}

static void imc_decode_level_coefficients(IMCContext* q, int* levlCoeffBuf, float* flcoeffs1,
float* flcoeffs2)
static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf,
float *flcoeffs1, float *flcoeffs2)
{
int i, level;
float tmp, tmp2;
//maybe some frequency division thingy
// maybe some frequency division thingy

flcoeffs1[0] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
flcoeffs2[0] = log(flcoeffs1[0])/log(2);
tmp = flcoeffs1[0];
flcoeffs2[0] = log(flcoeffs1[0]) / log(2);
tmp = flcoeffs1[0];
tmp2 = flcoeffs2[0];

for(i = 1; i < BANDS; i++) {
for (i = 1; i < BANDS; i++) {
level = levlCoeffBuf[i];
if (level == 16) {
flcoeffs1[i] = 1.0;
flcoeffs2[i] = 0.0;
} else {
if (level < 17)
level -=7;
level -= 7;
else if (level <= 24)
level -=32;
level -= 32;
else
level -=16;
level -= 16;

tmp *= imc_exp_tab[15 + level];
tmp2 += 0.83048 * level; // 0.83048 = log2(10) * 0.25
@@ -290,17 +290,20 @@ static void imc_decode_level_coefficients(IMCContext* q, int* levlCoeffBuf, floa
}


static void imc_decode_level_coefficients2(IMCContext* q, int* levlCoeffBuf, float* old_floor, float* flcoeffs1,
float* flcoeffs2) {
static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf,
float *old_floor, float *flcoeffs1,
float *flcoeffs2)
{
int i;
//FIXME maybe flag_buf = noise coding and flcoeffs1 = new scale factors
// and flcoeffs2 old scale factors
// might be incomplete due to a missing table that is in the binary code
for(i = 0; i < BANDS; i++) {
/* FIXME maybe flag_buf = noise coding and flcoeffs1 = new scale factors
* and flcoeffs2 old scale factors
* might be incomplete due to a missing table that is in the binary code
*/
for (i = 0; i < BANDS; i++) {
flcoeffs1[i] = 0;
if(levlCoeffBuf[i] < 16) {
if (levlCoeffBuf[i] < 16) {
flcoeffs1[i] = imc_exp_tab2[levlCoeffBuf[i]] * old_floor[i];
flcoeffs2[i] = (levlCoeffBuf[i]-7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25
flcoeffs2[i] = (levlCoeffBuf[i] - 7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25
} else {
flcoeffs1[i] = old_floor[i];
}
@@ -310,7 +313,9 @@ static void imc_decode_level_coefficients2(IMCContext* q, int* levlCoeffBuf, flo
/**
* Perform bit allocation depending on bits available
*/
static int bit_allocation (IMCContext* q, int stream_format_code, int freebits, int flag) {
static int bit_allocation(IMCContext *q, int stream_format_code, int freebits,
int flag)
{
int i, j;
const float limit = -1.e20;
float highest = 0.0;
@@ -327,31 +332,30 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,
int flg;
int found_indx = 0;

for(i = 0; i < BANDS; i++)
for (i = 0; i < BANDS; i++)
highest = FFMAX(highest, q->flcoeffs1[i]);

for(i = 0; i < BANDS-1; i++) {
q->flcoeffs4[i] = q->flcoeffs3[i] - log(q->flcoeffs5[i])/log(2);
}
for (i = 0; i < BANDS - 1; i++)
q->flcoeffs4[i] = q->flcoeffs3[i] - log(q->flcoeffs5[i]) / log(2);
q->flcoeffs4[BANDS - 1] = limit;

highest = highest * 0.25;

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
indx = -1;
if ((band_tab[i+1] - band_tab[i]) == q->bandWidthT[i])
if ((band_tab[i + 1] - band_tab[i]) == q->bandWidthT[i])
indx = 0;

if ((band_tab[i+1] - band_tab[i]) > q->bandWidthT[i])
if ((band_tab[i + 1] - band_tab[i]) > q->bandWidthT[i])
indx = 1;

if (((band_tab[i+1] - band_tab[i])/2) >= q->bandWidthT[i])
if (((band_tab[i + 1] - band_tab[i]) / 2) >= q->bandWidthT[i])
indx = 2;

if (indx == -1)
return AVERROR_INVALIDDATA;

q->flcoeffs4[i] = q->flcoeffs4[i] + xTab[(indx*2 + (q->flcoeffs1[i] < highest)) * 2 + flag];
q->flcoeffs4[i] += xTab[(indx * 2 + (q->flcoeffs1[i] < highest)) * 2 + flag];
}

if (stream_format_code & 0x2) {
@@ -361,22 +365,23 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,
q->flcoeffs4[3] = limit;
}

for(i = (stream_format_code & 0x2)?4:0; i < BANDS-1; i++) {
iacc += q->bandWidthT[i];
for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS - 1; i++) {
iacc += q->bandWidthT[i];
summa += q->bandWidthT[i] * q->flcoeffs4[i];
}
q->bandWidthT[BANDS-1] = 0;
q->bandWidthT[BANDS - 1] = 0;
summa = (summa * 0.5 - freebits) / iacc;


for(i = 0; i < BANDS/2; i++) {
for (i = 0; i < BANDS / 2; i++) {
rres = summer - freebits;
if((rres >= -8) && (rres <= 8)) break;
if ((rres >= -8) && (rres <= 8))
break;

summer = 0;
iacc = 0;
iacc = 0;

for(j = (stream_format_code & 0x2)?4:0; j < BANDS; j++) {
for (j = (stream_format_code & 0x2) ? 4 : 0; j < BANDS; j++) {
cwlen = av_clipf(((q->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6);

q->bitsBandT[j] = cwlen;
@@ -392,32 +397,33 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,
t2 = -1;
if (i == 0)
flg = t2;
if(flg != t2)
if (flg != t2)
t1++;

summa = (float)(summer - freebits) / ((t1 + 1) * iacc) + summa;
}

for(i = (stream_format_code & 0x2)?4:0; i < BANDS; i++) {
for(j = band_tab[i]; j < band_tab[i+1]; j++)
for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS; i++) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++)
q->CWlengthT[j] = q->bitsBandT[i];
}

if (freebits > summer) {
for(i = 0; i < BANDS; i++) {
workT[i] = (q->bitsBandT[i] == 6) ? -1.e20 : (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
for (i = 0; i < BANDS; i++) {
workT[i] = (q->bitsBandT[i] == 6) ? -1.e20
: (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
}

highest = 0.0;

do{
do {
if (highest <= -1.e20)
break;

found_indx = 0;
highest = -1.e20;

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
if (workT[i] > highest) {
highest = workT[i];
found_indx = i;
@@ -426,19 +432,20 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,

if (highest > -1.e20) {
workT[found_indx] -= 2.0;
if (++(q->bitsBandT[found_indx]) == 6)
if (++q->bitsBandT[found_indx] == 6)
workT[found_indx] = -1.e20;

for(j = band_tab[found_indx]; j < band_tab[found_indx+1] && (freebits > summer); j++){
for (j = band_tab[found_indx]; j < band_tab[found_indx + 1] && (freebits > summer); j++) {
q->CWlengthT[j]++;
summer++;
}
}
}while (freebits > summer);
} while (freebits > summer);
}
if (freebits < summer) {
for(i = 0; i < BANDS; i++) {
workT[i] = q->bitsBandT[i] ? (q->bitsBandT[i] * -2 + q->flcoeffs4[i] + 1.585) : 1.e20;
for (i = 0; i < BANDS; i++) {
workT[i] = q->bitsBandT[i] ? (q->bitsBandT[i] * -2 + q->flcoeffs4[i] + 1.585)
: 1.e20;
}
if (stream_format_code & 0x2) {
workT[0] = 1.e20;
@@ -446,23 +453,24 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,
workT[2] = 1.e20;
workT[3] = 1.e20;
}
while (freebits < summer){
lowest = 1.e10;
while (freebits < summer) {
lowest = 1.e10;
low_indx = 0;
for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
if (workT[i] < lowest) {
lowest = workT[i];
lowest = workT[i];
low_indx = i;
}
}
//if(lowest >= 1.e10) break;
// if (lowest >= 1.e10)
// break;
workT[low_indx] = lowest + 2.0;

if (!(--q->bitsBandT[low_indx]))
if (!--q->bitsBandT[low_indx])
workT[low_indx] = 1.e20;

for(j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++){
if(q->CWlengthT[j] > 0){
for (j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++) {
if (q->CWlengthT[j] > 0) {
q->CWlengthT[j]--;
summer--;
}
@@ -472,49 +480,51 @@ static int bit_allocation (IMCContext* q, int stream_format_code, int freebits,
return 0;
}

static void imc_get_skip_coeff(IMCContext* q) {
static void imc_get_skip_coeff(IMCContext *q)
{
int i, j;

memset(q->skipFlagBits, 0, sizeof(q->skipFlagBits));
memset(q->skipFlagBits, 0, sizeof(q->skipFlagBits));
memset(q->skipFlagCount, 0, sizeof(q->skipFlagCount));
for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
if (!q->bandFlagsBuf[i] || !q->bandWidthT[i])
continue;

if (!q->skipFlagRaw[i]) {
q->skipFlagBits[i] = band_tab[i+1] - band_tab[i];
q->skipFlagBits[i] = band_tab[i + 1] - band_tab[i];

for(j = band_tab[i]; j < band_tab[i+1]; j++) {
if ((q->skipFlags[j] = get_bits1(&q->gb)))
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
q->skipFlags[j] = get_bits1(&q->gb);
if (q->skipFlags[j])
q->skipFlagCount[i]++;
}
} else {
for(j = band_tab[i]; j < (band_tab[i+1]-1); j += 2) {
if(!get_bits1(&q->gb)){//0
for (j = band_tab[i]; j < band_tab[i + 1] - 1; j += 2) {
if (!get_bits1(&q->gb)) { // 0
q->skipFlagBits[i]++;
q->skipFlags[j]=1;
q->skipFlags[j+1]=1;
q->skipFlags[j] = 1;
q->skipFlags[j + 1] = 1;
q->skipFlagCount[i] += 2;
}else{
if(get_bits1(&q->gb)){//11
q->skipFlagBits[i] +=2;
q->skipFlags[j]=0;
q->skipFlags[j+1]=1;
} else {
if (get_bits1(&q->gb)) { // 11
q->skipFlagBits[i] += 2;
q->skipFlags[j] = 0;
q->skipFlags[j + 1] = 1;
q->skipFlagCount[i]++;
}else{
q->skipFlagBits[i] +=3;
q->skipFlags[j+1]=0;
if(!get_bits1(&q->gb)){//100
q->skipFlags[j]=1;
} else {
q->skipFlagBits[i] += 3;
q->skipFlags[j + 1] = 0;
if (!get_bits1(&q->gb)) { // 100
q->skipFlags[j] = 1;
q->skipFlagCount[i]++;
}else{//101
q->skipFlags[j]=0;
} else { // 101
q->skipFlags[j] = 0;
}
}
}
}

if (j < band_tab[i+1]) {
if (j < band_tab[i + 1]) {
q->skipFlagBits[i]++;
if ((q->skipFlags[j] = get_bits1(&q->gb)))
q->skipFlagCount[i]++;
@@ -526,24 +536,26 @@ static void imc_get_skip_coeff(IMCContext* q) {
/**
* Increase highest' band coefficient sizes as some bits won't be used
*/
static void imc_adjust_bit_allocation (IMCContext* q, int summer) {
static void imc_adjust_bit_allocation(IMCContext *q, int summer)
{
float workT[32];
int corrected = 0;
int i, j;
float highest = 0;
int found_indx=0;
float highest = 0;
int found_indx = 0;

for(i = 0; i < BANDS; i++) {
workT[i] = (q->bitsBandT[i] == 6) ? -1.e20 : (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
for (i = 0; i < BANDS; i++) {
workT[i] = (q->bitsBandT[i] == 6) ? -1.e20
: (q->bitsBandT[i] * -2 + q->flcoeffs4[i] - 0.415);
}

while (corrected < summer) {
if(highest <= -1.e20)
if (highest <= -1.e20)
break;

highest = -1.e20;

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
if (workT[i] > highest) {
highest = workT[i];
found_indx = i;
@@ -555,7 +567,7 @@ static void imc_adjust_bit_allocation (IMCContext* q, int summer) {
if (++(q->bitsBandT[found_indx]) == 6)
workT[found_indx] = -1.e20;

for(j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) {
for (j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) {
if (!q->skipFlags[j] && (q->CWlengthT[j] < 6)) {
q->CWlengthT[j]++;
corrected++;
@@ -565,61 +577,65 @@ static void imc_adjust_bit_allocation (IMCContext* q, int summer) {
}
}

static void imc_imdct256(IMCContext *q) {
static void imc_imdct256(IMCContext *q)
{
int i;
float re, im;

/* prerotation */
for(i=0; i < COEFFS/2; i++){
q->samples[i].re = -(q->pre_coef1[i] * q->CWdecoded[COEFFS-1-i*2]) -
(q->pre_coef2[i] * q->CWdecoded[i*2]);
q->samples[i].im = (q->pre_coef2[i] * q->CWdecoded[COEFFS-1-i*2]) -
(q->pre_coef1[i] * q->CWdecoded[i*2]);
for (i = 0; i < COEFFS / 2; i++) {
q->samples[i].re = -(q->pre_coef1[i] * q->CWdecoded[COEFFS - 1 - i * 2]) -
(q->pre_coef2[i] * q->CWdecoded[i * 2]);
q->samples[i].im = (q->pre_coef2[i] * q->CWdecoded[COEFFS - 1 - i * 2]) -
(q->pre_coef1[i] * q->CWdecoded[i * 2]);
}

/* FFT */
q->fft.fft_permute(&q->fft, q->samples);
q->fft.fft_calc (&q->fft, q->samples);
q->fft.fft_calc(&q->fft, q->samples);

/* postrotation, window and reorder */
for(i = 0; i < COEFFS/2; i++){
re = (q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]);
im = (-q->samples[i].im * q->post_cos[i]) - (q->samples[i].re * q->post_sin[i]);
q->out_samples[i*2] = (q->mdct_sine_window[COEFFS-1-i*2] * q->last_fft_im[i]) + (q->mdct_sine_window[i*2] * re);
q->out_samples[COEFFS-1-i*2] = (q->mdct_sine_window[i*2] * q->last_fft_im[i]) - (q->mdct_sine_window[COEFFS-1-i*2] * re);
for (i = 0; i < COEFFS / 2; i++) {
re = ( q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]);
im = (-q->samples[i].im * q->post_cos[i]) - ( q->samples[i].re * q->post_sin[i]);
q->out_samples[i * 2] = (q->mdct_sine_window[COEFFS - 1 - i * 2] * q->last_fft_im[i])
+ (q->mdct_sine_window[i * 2] * re);
q->out_samples[COEFFS - 1 - i * 2] = (q->mdct_sine_window[i * 2] * q->last_fft_im[i])
- (q->mdct_sine_window[COEFFS - 1 - i * 2] * re);
q->last_fft_im[i] = im;
}
}

static int inverse_quant_coeff (IMCContext* q, int stream_format_code) {
static int inverse_quant_coeff(IMCContext *q, int stream_format_code)
{
int i, j;
int middle_value, cw_len, max_size;
const float* quantizer;
const float *quantizer;

for(i = 0; i < BANDS; i++) {
for(j = band_tab[i]; j < band_tab[i+1]; j++) {
for (i = 0; i < BANDS; i++) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
q->CWdecoded[j] = 0;
cw_len = q->CWlengthT[j];

if (cw_len <= 0 || q->skipFlags[j])
continue;

max_size = 1 << cw_len;
max_size = 1 << cw_len;
middle_value = max_size >> 1;

if (q->codewords[j] >= max_size || q->codewords[j] < 0)
return AVERROR_INVALIDDATA;

if (cw_len >= 4){
if (cw_len >= 4) {
quantizer = imc_quantizer2[(stream_format_code & 2) >> 1];
if (q->codewords[j] >= middle_value)
q->CWdecoded[j] = quantizer[q->codewords[j] - 8] * q->flcoeffs6[i];
q->CWdecoded[j] = quantizer[q->codewords[j] - 8] * q->flcoeffs6[i];
else
q->CWdecoded[j] = -quantizer[max_size - q->codewords[j] - 8 - 1] * q->flcoeffs6[i];
}else{
quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (q->bandFlagsBuf[i] << 1)];
if (q->codewords[j] >= middle_value)
q->CWdecoded[j] = quantizer[q->codewords[j] - 1] * q->flcoeffs6[i];
q->CWdecoded[j] = quantizer[q->codewords[j] - 1] * q->flcoeffs6[i];
else
q->CWdecoded[j] = -quantizer[max_size - 2 - q->codewords[j]] * q->flcoeffs6[i];
}
@@ -629,22 +645,24 @@ static int inverse_quant_coeff (IMCContext* q, int stream_format_code) {
}


static int imc_get_coeffs (IMCContext* q) {
static int imc_get_coeffs(IMCContext *q)
{
int i, j, cw_len, cw;

for(i = 0; i < BANDS; i++) {
if(!q->sumLenArr[i]) continue;
for (i = 0; i < BANDS; i++) {
if (!q->sumLenArr[i])
continue;
if (q->bandFlagsBuf[i] || q->bandWidthT[i]) {
for(j = band_tab[i]; j < band_tab[i+1]; j++) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
cw_len = q->CWlengthT[j];
cw = 0;

if (get_bits_count(&q->gb) + cw_len > 512){
//av_log(NULL,0,"Band %i coeff %i cw_len %i\n",i,j,cw_len);
if (get_bits_count(&q->gb) + cw_len > 512) {
// av_log(NULL, 0, "Band %i coeff %i cw_len %i\n", i, j, cw_len);
return AVERROR_INVALIDDATA;
}

if(cw_len && (!q->bandFlagsBuf[i] || !q->skipFlags[j]))
if (cw_len && (!q->bandFlagsBuf[i] || !q->skipFlags[j]))
cw = get_bits(&q->gb, cw_len);

q->codewords[j] = cw;
@@ -654,7 +672,7 @@ static int imc_get_coeffs (IMCContext* q) {
return 0;
}

static int imc_decode_frame(AVCodecContext * avctx, void *data,
static int imc_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
@@ -680,7 +698,7 @@ static int imc_decode_frame(AVCodecContext * avctx, void *data,
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
q->out_samples = (float *)q->frame.data[0];
q->out_samples = (float*)q->frame.data[0];

q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2);

@@ -695,7 +713,7 @@ static int imc_decode_frame(AVCodecContext * avctx, void *data,
}
stream_format_code = get_bits(&q->gb, 3);

if(stream_format_code & 1){
if (stream_format_code & 1) {
av_log(avctx, AV_LOG_ERROR, "Stream code format %X is not supported\n", stream_format_code);
return AVERROR_INVALIDDATA;
}
@@ -705,10 +723,12 @@ static int imc_decode_frame(AVCodecContext * avctx, void *data,
if (stream_format_code & 0x04)
q->decoder_reset = 1;

if(q->decoder_reset) {
if (q->decoder_reset) {
memset(q->out_samples, 0, sizeof(q->out_samples));
for(i = 0; i < BANDS; i++)q->old_floor[i] = 1.0;
for(i = 0; i < COEFFS; i++)q->CWdecoded[i] = 0;
for (i = 0; i < BANDS; i++)
q->old_floor[i] = 1.0;
for (i = 0; i < COEFFS; i++)
q->CWdecoded[i] = 0;
q->decoder_reset = 0;
}

@@ -716,22 +736,24 @@ static int imc_decode_frame(AVCodecContext * avctx, void *data,
imc_read_level_coeffs(q, stream_format_code, q->levlCoeffBuf);

if (stream_format_code & 0x4)
imc_decode_level_coefficients(q, q->levlCoeffBuf, q->flcoeffs1, q->flcoeffs2);
imc_decode_level_coefficients(q, q->levlCoeffBuf,
q->flcoeffs1, q->flcoeffs2);
else
imc_decode_level_coefficients2(q, q->levlCoeffBuf, q->old_floor, q->flcoeffs1, q->flcoeffs2);
imc_decode_level_coefficients2(q, q->levlCoeffBuf, q->old_floor,
q->flcoeffs1, q->flcoeffs2);

memcpy(q->old_floor, q->flcoeffs1, 32 * sizeof(float));

counter = 0;
for (i=0 ; i<BANDS ; i++) {
for (i = 0; i < BANDS; i++) {
if (q->levlCoeffBuf[i] == 16) {
q->bandWidthT[i] = 0;
counter++;
} else
q->bandWidthT[i] = band_tab[i+1] - band_tab[i];
q->bandWidthT[i] = band_tab[i + 1] - band_tab[i];
}
memset(q->bandFlagsBuf, 0, BANDS * sizeof(int));
for(i = 0; i < BANDS-1; i++) {
for (i = 0; i < BANDS - 1; i++) {
if (q->bandWidthT[i])
q->bandFlagsBuf[i] = get_bits1(&q->gb);
}
@@ -747,78 +769,79 @@ static int imc_decode_frame(AVCodecContext * avctx, void *data,
q->CWlengthT[0] = 5;
q->CWlengthT[1] = 5;
q->CWlengthT[2] = 5;
for(i = 1; i < 4; i++){
for (i = 1; i < 4; i++) {
bits = (q->levlCoeffBuf[i] == 16) ? 0 : 5;
q->bitsBandT[i] = bits;
for(j = band_tab[i]; j < band_tab[i+1]; j++) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
q->CWlengthT[j] = bits;
bitscount += bits;
bitscount += bits;
}
}
}

if((ret = bit_allocation (q, stream_format_code,
512 - bitscount - get_bits_count(&q->gb), flag)) < 0) {
if ((ret = bit_allocation(q, stream_format_code,
512 - bitscount - get_bits_count(&q->gb),
flag)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n");
q->decoder_reset = 1;
return ret;
}

for(i = 0; i < BANDS; i++) {
q->sumLenArr[i] = 0;
for (i = 0; i < BANDS; i++) {
q->sumLenArr[i] = 0;
q->skipFlagRaw[i] = 0;
for(j = band_tab[i]; j < band_tab[i+1]; j++)
for (j = band_tab[i]; j < band_tab[i + 1]; j++)
q->sumLenArr[i] += q->CWlengthT[j];
if (q->bandFlagsBuf[i])
if( (((band_tab[i+1] - band_tab[i]) * 1.5) > q->sumLenArr[i]) && (q->sumLenArr[i] > 0))
if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > q->sumLenArr[i]) && (q->sumLenArr[i] > 0))
q->skipFlagRaw[i] = 1;
}

imc_get_skip_coeff(q);

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
q->flcoeffs6[i] = q->flcoeffs1[i];
/* band has flag set and at least one coded coefficient */
if (q->bandFlagsBuf[i] && (band_tab[i+1] - band_tab[i]) != q->skipFlagCount[i]){
q->flcoeffs6[i] *= q->sqrt_tab[band_tab[i+1] - band_tab[i]] /
q->sqrt_tab[(band_tab[i+1] - band_tab[i] - q->skipFlagCount[i])];
if (q->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != q->skipFlagCount[i]) {
q->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] /
q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - q->skipFlagCount[i])];
}
}

/* calculate bits left, bits needed and adjust bit allocation */
bits = summer = 0;

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
if (q->bandFlagsBuf[i]) {
for(j = band_tab[i]; j < band_tab[i+1]; j++) {
if(q->skipFlags[j]) {
for (j = band_tab[i]; j < band_tab[i + 1]; j++) {
if (q->skipFlags[j]) {
summer += q->CWlengthT[j];
q->CWlengthT[j] = 0;
}
}
bits += q->skipFlagBits[i];
bits += q->skipFlagBits[i];
summer -= q->skipFlagBits[i];
}
}
imc_adjust_bit_allocation(q, summer);

for(i = 0; i < BANDS; i++) {
for (i = 0; i < BANDS; i++) {
q->sumLenArr[i] = 0;

for(j = band_tab[i]; j < band_tab[i+1]; j++)
for (j = band_tab[i]; j < band_tab[i + 1]; j++)
if (!q->skipFlags[j])
q->sumLenArr[i] += q->CWlengthT[j];
}

memset(q->codewords, 0, sizeof(q->codewords));

if(imc_get_coeffs(q) < 0) {
if (imc_get_coeffs(q) < 0) {
av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n");
q->decoder_reset = 1;
return AVERROR_INVALIDDATA;
}

if(inverse_quant_coeff(q, stream_format_code) < 0) {
if (inverse_quant_coeff(q, stream_format_code) < 0) {
av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n");
q->decoder_reset = 1;
return AVERROR_INVALIDDATA;


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