* ac3_imdct.c: ac3 DCT
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
- * $Id: ac3_imdct.c,v 1.15 2001/04/20 12:14:34 reno Exp $
+ * $Id: ac3_imdct.c,v 1.17 2001/04/30 21:04:20 reno Exp $
*
* Authors: Michel Kaempf <maxx@via.ecp.fr>
* Aaron Holtzman <aholtzma@engr.uvic.ca>
#include "ac3_internal.h"
#include "ac3_downmix.h"
+#include "ac3_imdct_c.h"
+#if 0
+#include "ac3_imdct_kni.h"
+#endif
-void imdct_do_256(imdct_t * p_imdct, float x[],float y[], int id);
-void imdct_do_512(imdct_t * p_imdct, float x[],float y[], int id);
+#include "tests.h"
-/* 128 point bit-reverse LUT */
-static const u8 bit_reverse_512[] = {
- 0x00, 0x40, 0x20, 0x60, 0x10, 0x50, 0x30, 0x70,
- 0x08, 0x48, 0x28, 0x68, 0x18, 0x58, 0x38, 0x78,
- 0x04, 0x44, 0x24, 0x64, 0x14, 0x54, 0x34, 0x74,
- 0x0c, 0x4c, 0x2c, 0x6c, 0x1c, 0x5c, 0x3c, 0x7c,
- 0x02, 0x42, 0x22, 0x62, 0x12, 0x52, 0x32, 0x72,
- 0x0a, 0x4a, 0x2a, 0x6a, 0x1a, 0x5a, 0x3a, 0x7a,
- 0x06, 0x46, 0x26, 0x66, 0x16, 0x56, 0x36, 0x76,
- 0x0e, 0x4e, 0x2e, 0x6e, 0x1e, 0x5e, 0x3e, 0x7e,
- 0x01, 0x41, 0x21, 0x61, 0x11, 0x51, 0x31, 0x71,
- 0x09, 0x49, 0x29, 0x69, 0x19, 0x59, 0x39, 0x79,
- 0x05, 0x45, 0x25, 0x65, 0x15, 0x55, 0x35, 0x75,
- 0x0d, 0x4d, 0x2d, 0x6d, 0x1d, 0x5d, 0x3d, 0x7d,
- 0x03, 0x43, 0x23, 0x63, 0x13, 0x53, 0x33, 0x73,
- 0x0b, 0x4b, 0x2b, 0x6b, 0x1b, 0x5b, 0x3b, 0x7b,
- 0x07, 0x47, 0x27, 0x67, 0x17, 0x57, 0x37, 0x77,
- 0x0f, 0x4f, 0x2f, 0x6f, 0x1f, 0x5f, 0x3f, 0x7f};
+#ifndef M_PI
+# define M_PI 3.14159265358979323846
+#endif
-static const u8 bit_reverse_256[] = {
- 0x00, 0x20, 0x10, 0x30, 0x08, 0x28, 0x18, 0x38,
- 0x04, 0x24, 0x14, 0x34, 0x0c, 0x2c, 0x1c, 0x3c,
- 0x02, 0x22, 0x12, 0x32, 0x0a, 0x2a, 0x1a, 0x3a,
- 0x06, 0x26, 0x16, 0x36, 0x0e, 0x2e, 0x1e, 0x3e,
- 0x01, 0x21, 0x11, 0x31, 0x09, 0x29, 0x19, 0x39,
- 0x05, 0x25, 0x15, 0x35, 0x0d, 0x2d, 0x1d, 0x3d,
- 0x03, 0x23, 0x13, 0x33, 0x0b, 0x2b, 0x1b, 0x3b,
- 0x07, 0x27, 0x17, 0x37, 0x0f, 0x2f, 0x1f, 0x3f};
-
-/* Windowing function for Modified DCT - Thank you acroread */
-static float window[] = {
- 0.00014, 0.00024, 0.00037, 0.00051, 0.00067, 0.00086, 0.00107, 0.00130,
- 0.00157, 0.00187, 0.00220, 0.00256, 0.00297, 0.00341, 0.00390, 0.00443,
- 0.00501, 0.00564, 0.00632, 0.00706, 0.00785, 0.00871, 0.00962, 0.01061,
- 0.01166, 0.01279, 0.01399, 0.01526, 0.01662, 0.01806, 0.01959, 0.02121,
- 0.02292, 0.02472, 0.02662, 0.02863, 0.03073, 0.03294, 0.03527, 0.03770,
- 0.04025, 0.04292, 0.04571, 0.04862, 0.05165, 0.05481, 0.05810, 0.06153,
- 0.06508, 0.06878, 0.07261, 0.07658, 0.08069, 0.08495, 0.08935, 0.09389,
- 0.09859, 0.10343, 0.10842, 0.11356, 0.11885, 0.12429, 0.12988, 0.13563,
- 0.14152, 0.14757, 0.15376, 0.16011, 0.16661, 0.17325, 0.18005, 0.18699,
- 0.19407, 0.20130, 0.20867, 0.21618, 0.22382, 0.23161, 0.23952, 0.24757,
- 0.25574, 0.26404, 0.27246, 0.28100, 0.28965, 0.29841, 0.30729, 0.31626,
- 0.32533, 0.33450, 0.34376, 0.35311, 0.36253, 0.37204, 0.38161, 0.39126,
- 0.40096, 0.41072, 0.42054, 0.43040, 0.44030, 0.45023, 0.46020, 0.47019,
- 0.48020, 0.49022, 0.50025, 0.51028, 0.52031, 0.53033, 0.54033, 0.55031,
- 0.56026, 0.57019, 0.58007, 0.58991, 0.59970, 0.60944, 0.61912, 0.62873,
- 0.63827, 0.64774, 0.65713, 0.66643, 0.67564, 0.68476, 0.69377, 0.70269,
- 0.71150, 0.72019, 0.72877, 0.73723, 0.74557, 0.75378, 0.76186, 0.76981,
- 0.77762, 0.78530, 0.79283, 0.80022, 0.80747, 0.81457, 0.82151, 0.82831,
- 0.83496, 0.84145, 0.84779, 0.85398, 0.86001, 0.86588, 0.87160, 0.87716,
- 0.88257, 0.88782, 0.89291, 0.89785, 0.90264, 0.90728, 0.91176, 0.91610,
- 0.92028, 0.92432, 0.92822, 0.93197, 0.93558, 0.93906, 0.94240, 0.94560,
- 0.94867, 0.95162, 0.95444, 0.95713, 0.95971, 0.96217, 0.96451, 0.96674,
- 0.96887, 0.97089, 0.97281, 0.97463, 0.97635, 0.97799, 0.97953, 0.98099,
- 0.98236, 0.98366, 0.98488, 0.98602, 0.98710, 0.98811, 0.98905, 0.98994,
- 0.99076, 0.99153, 0.99225, 0.99291, 0.99353, 0.99411, 0.99464, 0.99513,
- 0.99558, 0.99600, 0.99639, 0.99674, 0.99706, 0.99736, 0.99763, 0.99788,
- 0.99811, 0.99831, 0.99850, 0.99867, 0.99882, 0.99895, 0.99908, 0.99919,
- 0.99929, 0.99938, 0.99946, 0.99953, 0.99959, 0.99965, 0.99969, 0.99974,
- 0.99978, 0.99981, 0.99984, 0.99986, 0.99988, 0.99990, 0.99992, 0.99993,
- 0.99994, 0.99995, 0.99996, 0.99997, 0.99998, 0.99998, 0.99998, 0.99999,
- 0.99999, 0.99999, 0.99999, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000,
- 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000 };
-
-static __inline__ void swap_cmplx(complex_t *a, complex_t *b)
-{
- complex_t tmp;
-
- tmp = *a;
- *a = *b;
- *b = tmp;
-}
-
-static __inline__ complex_t cmplx_mult(complex_t a, complex_t b)
-{
- complex_t ret;
-
- ret.real = a.real * b.real - a.imag * b.imag;
- ret.imag = a.real * b.imag + a.imag * b.real;
-
- return ret;
-}
void imdct_init(imdct_t * p_imdct)
{
- int i,k;
- complex_t angle_step;
- complex_t current_angle;
-
- /* Twiddle factors to turn IFFT into IMDCT */
- for (i=0; i < N/4; i++) {
- p_imdct->xcos1[i] = -cos(2 * M_PI * (8*i+1)/(8*N)) ;
- p_imdct->xsin1[i] = -sin(2 * M_PI * (8*i+1)/(8*N)) ;
- }
+ int i;
+ float scale = 255.99609372;
- /* More twiddle factors to turn IFFT into IMDCT */
- for (i=0; i < N/8; i++) {
- p_imdct->xcos2[i] = -cos(2 * M_PI * (8*i+1)/(4*N)) ;
- p_imdct->xsin2[i] = -sin(2 * M_PI * (8*i+1)/(4*N)) ;
+#if 0
+ if ( TestCPU (CPU_CAPABILITY_MMX) )
+ {
+ imdct_init_kni (p_imdct);
+ } else
+#endif
+ {
+ imdct_init_c (p_imdct);
}
- /* Canonical twiddle factors for FFT */
- p_imdct->w[0] = p_imdct->w_1;
- p_imdct->w[1] = p_imdct->w_2;
- p_imdct->w[2] = p_imdct->w_4;
- p_imdct->w[3] = p_imdct->w_8;
- p_imdct->w[4] = p_imdct->w_16;
- p_imdct->w[5] = p_imdct->w_32;
- p_imdct->w[6] = p_imdct->w_64;
-
- for (i = 0; i < 7; i++) {
- angle_step.real = cos(-2.0f * M_PI / (1 << (i+1)));
- angle_step.imag = sin(-2.0f * M_PI / (1 << (i+1)));
-
- current_angle.real = 1.0f;
- current_angle.imag = 0.0f;
-
- for (k = 0; k < 1 << i; k++) {
- p_imdct->w[i][k] = current_angle;
- current_angle = cmplx_mult(current_angle,angle_step);
- }
- }
+ /* More twiddle factors to turn IFFT into IMDCT */
+ for (i=0; i < 64; i++) {
+ p_imdct->xcos2[i] = cos(2.0f * M_PI * (8*i+1)/(4*N)) * scale;
+ p_imdct->xsin2[i] = sin(2.0f * M_PI * (8*i+1)/(4*N)) * scale;
+ }
}
void imdct (ac3dec_t * p_ac3dec, s16 * buffer)
{
- int i, i_stream_done;
- int doable = 0;
- void (*do_imdct)(imdct_t * p_imdct, float x[],float y[], int id);
-
- /* Test if dm in frequency is doable */
- if ( !(doable = p_ac3dec->audblk.blksw[0]) )
- do_imdct = imdct_do_512;
- else
- do_imdct = imdct_do_256;
-
- /* Downmix in the frequency domain if all the channes use the same imdct */
- for (i=0; i < p_ac3dec->bsi.nfchans; i++)
+ int i;
+ int doable = 0;
+ float *center=NULL, *left, *right, *left_sur, *right_sur;
+ float *delay_left, *delay_right;
+ float *delay1_left, *delay1_right, *delay1_center, *delay1_sr, *delay1_sl;
+ float right_tmp, left_tmp;
+ void (*do_imdct)(imdct_t * p_imdct, float data[], float delay[]);
+
+ /* test if dm in frequency is doable */
+ if (!(doable = p_ac3dec->audblk.blksw[0]))
{
- if ( doable != p_ac3dec->audblk.blksw[i] )
- {
- do_imdct = NULL;
- break;
- }
+ do_imdct = p_ac3dec->imdct.imdct_do_512;
}
-
- if (do_imdct)
+ else
{
- i_stream_done = downmix(p_ac3dec, p_ac3dec->coeffs.fbw[0], buffer);
- do_imdct(&p_ac3dec->imdct,p_ac3dec->coeffs.fbw[0],p_ac3dec->samples.channel[0], 0);
- do_imdct(&p_ac3dec->imdct, p_ac3dec->coeffs.fbw[1],p_ac3dec->samples.channel[1], 1);
- } else {
- for (i=0; i<p_ac3dec->bsi.nfchans;i++) {
- if (p_ac3dec->audblk.blksw[i])
- imdct_do_256(&p_ac3dec->imdct, p_ac3dec->coeffs.fbw[i],p_ac3dec->samples.channel[i], i);
- else
- imdct_do_512(&p_ac3dec->imdct, p_ac3dec->coeffs.fbw[i],p_ac3dec->samples.channel[i], i);
- }
- i_stream_done = downmix(p_ac3dec, p_ac3dec->samples.channel[0], buffer);
+ do_imdct = imdct_do_256; /* There is only a C function */
}
- if ( !i_stream_done ) /* We have to stream sample */
+ /* downmix in the frequency domain if all the channels
+ * use the same imdct */
+ for (i=0; i < p_ac3dec->bsi.nfchans; i++)
{
- stream_sample_2ch_to_s16_c(buffer, p_ac3dec->samples.channel[0],
- p_ac3dec->samples.channel[1]);
- } else {
- stream_sample_1ch_to_s16_c(buffer, p_ac3dec->samples.channel[0]);
- }
-
- /* XXX?? We don't bother with the IMDCT for the LFE as it's currently
- * unused. */
- //if (bsi->lfeon)
- // imdct_do_512(coeffs->lfe,samples->channel[5],delay[5]);
-}
-
-void imdct_do_512(imdct_t * p_imdct, float x[], float y[], int id)
-{
- int i,k;
- int p,q;
- int m;
- int two_m;
- int two_m_plus_one;
-
- float tmp_a_i;
- float tmp_a_r;
- float tmp_b_i;
- float tmp_b_r;
-
-
- float *y_ptr;
- float *delay_ptr;
- float *window_ptr;
-
- /* Pre IFFT complex multiply plus IFFT cmplx conjugate */
- for (i=0; i < N/4; i++) {
- /* z[i] = (X[N/2-2*i-1] + j * X[2*i]) * (xcos1[i] + j * xsin1[i]) ; */
- p_imdct->buf[i].real = (x[N/2-2*i-1] * p_imdct->xcos1[i]) - (x[2*i] * p_imdct->xsin1[i]);
- p_imdct->buf[i].imag = -((x[2*i] * p_imdct->xcos1[i]) + (x[N/2-2*i-1] * p_imdct->xsin1[i]));
- }
-
- /* Bit reversed shuffling */
- for (i=0; i<N/4; i++) {
- k = bit_reverse_512[i];
- if (k < i)
- swap_cmplx(&p_imdct->buf[i],&p_imdct->buf[k]);
- }
-
- /* FFT Merge */
- for (m=0; m < 7; m++) {
- two_m = (1 << m);
- two_m_plus_one = (1 << (m+1));
-
- for (k = 0; k < two_m; k++) {
- for (i = 0; i < 128; i += two_m_plus_one) {
- p = k + i;
- q = p + two_m;
- tmp_a_r = p_imdct->buf[p].real;
- tmp_a_i = p_imdct->buf[p].imag;
- tmp_b_r = p_imdct->buf[q].real * p_imdct->w[m][k].real - p_imdct->buf[q].imag * p_imdct->w[m][k].imag;
- tmp_b_i = p_imdct->buf[q].imag * p_imdct->w[m][k].real + p_imdct->buf[q].real * p_imdct->w[m][k].imag;
- p_imdct->buf[p].real = tmp_a_r + tmp_b_r;
- p_imdct->buf[p].imag = tmp_a_i + tmp_b_i;
- p_imdct->buf[q].real = tmp_a_r - tmp_b_r;
- p_imdct->buf[q].imag = tmp_a_i - tmp_b_i;
- }
- }
- }
-
- /* Post IFFT complex multiply plus IFFT complex conjugate*/
- for (i=0; i < N/4; i++) {
- /* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */
- tmp_a_r = p_imdct->buf[i].real;
- tmp_a_i = - p_imdct->buf[i].imag;
- p_imdct->buf[i].real =(tmp_a_r * p_imdct->xcos1[i]) - (tmp_a_i * p_imdct->xsin1[i]);
- p_imdct->buf[i].imag =(tmp_a_r * p_imdct->xsin1[i]) + (tmp_a_i * p_imdct->xcos1[i]);
- }
-
- y_ptr = y;
- delay_ptr = p_imdct->delay[id];
- window_ptr = window;
- /* Window and convert to real valued signal */
- for (i=0; i<N/8; i++) {
- *y_ptr++ = 2.0f * (-p_imdct->buf[N/8+i].imag * *window_ptr++ + *delay_ptr++);
- *y_ptr++ = 2.0f * (p_imdct->buf[N/8-i-1].real * *window_ptr++ + *delay_ptr++);
- }
-
- for (i=0; i<N/8; i++) {
- *y_ptr++ = 2.0f * (-p_imdct->buf[i].real * *window_ptr++ + *delay_ptr++);
- *y_ptr++ = 2.0f * (p_imdct->buf[N/4-i-1].imag * *window_ptr++ + *delay_ptr++);
- }
-
- /* The trailing edge of the window goes into the delay line */
- delay_ptr = p_imdct->delay[id];
-
- for (i=0; i<N/8; i++) {
- *delay_ptr++ = -p_imdct->buf[N/8+i].real * *--window_ptr;
- *delay_ptr++ = p_imdct->buf[N/8-i-1].imag * *--window_ptr;
- }
-
- for (i=0; i<N/8; i++) {
- *delay_ptr++ = p_imdct->buf[i].imag * *--window_ptr;
- *delay_ptr++ = -p_imdct->buf[N/4-i-1].real * *--window_ptr;
- }
-}
-
-void imdct_do_256(imdct_t * p_imdct,float x[],float y[], int id)
-{
- int i,k;
- int p,q;
- int m;
- int two_m;
- int two_m_plus_one;
-
- float tmp_a_i;
- float tmp_a_r;
- float tmp_b_i;
- float tmp_b_r;
-
- complex_t *buf_1, *buf_2;
-
- buf_1 = &p_imdct->buf[0];
- buf_2 = &p_imdct->buf[64];
-
- /* Pre IFFT complex multiply plus IFFT cmplx conjugate */
- for (k=0; k<N/8; k++) {
- /* X1[k] = X[2*k] */
- /* X2[k] = X[2*k+1] */
-
- p = 2 * (N/4-2*k-1);
- q = 2 * (2 * k);
-
- /* Z1[k] = (X1[N/4-2*k-1] + j * X1[2*k]) * (xcos2[k] + j * xsin2[k]); */
- buf_1[k].real = x[p] * p_imdct->xcos2[k] - x[q] * p_imdct->xsin2[k];
- buf_1[k].imag = - (x[q] * p_imdct->xcos2[k] + x[p] * p_imdct->xsin2[k]);
- /* Z2[k] = (X2[N/4-2*k-1] + j * X2[2*k]) * (xcos2[k] + j * xsin2[k]); */
- buf_2[k].real = x[p + 1] * p_imdct->xcos2[k] - x[q + 1] * p_imdct->xsin2[k];
- buf_2[k].imag = - (x[q + 1] * p_imdct->xcos2[k] + x[p + 1] * p_imdct->xsin2[k]);
- }
-
- /* IFFT Bit reversed shuffling */
- for (i=0; i<N/8; i++) {
- k = bit_reverse_256[i];
- if (k < i) {
- swap_cmplx(&buf_1[i],&buf_1[k]);
- swap_cmplx(&buf_2[i],&buf_2[k]);
- }
- }
-
- /* FFT Merge */
- for (m=0; m < 6; m++) {
- two_m = (1 << m);
- two_m_plus_one = (1 << (m+1));
+ if (doable != p_ac3dec->audblk.blksw[i])
+ {
+ do_imdct = NULL;
+ break;
+ }
+ }
- for (k = 0; k < two_m; k++) {
- for (i = 0; i < 64; i += two_m_plus_one) {
- p = k + i;
- q = p + two_m;
- /* Do block 1 */
- tmp_a_r = buf_1[p].real;
- tmp_a_i = buf_1[p].imag;
- tmp_b_r = buf_1[q].real * p_imdct->w[m][k].real - buf_1[q].imag * p_imdct->w[m][k].imag;
- tmp_b_i = buf_1[q].imag * p_imdct->w[m][k].real + buf_1[q].real * p_imdct->w[m][k].imag;
- buf_1[p].real = tmp_a_r + tmp_b_r;
- buf_1[p].imag = tmp_a_i + tmp_b_i;
- buf_1[q].real = tmp_a_r - tmp_b_r;
- buf_1[q].imag = tmp_a_i - tmp_b_i;
+ if (do_imdct)
+ {
+ /* dowmix first and imdct */
+ switch(p_ac3dec->bsi.acmod)
+ {
+ case 7: /* 3/2 */
+ p_ac3dec->downmix.downmix_3f_2r_to_2ch (p_ac3dec->samples[0], &p_ac3dec->dm_par);
+ break;
+ case 6: /* 2/2 */
+ p_ac3dec->downmix.downmix_2f_2r_to_2ch (p_ac3dec->samples[0], &p_ac3dec->dm_par);
+ break;
+ case 5: /* 3/1 */
+ p_ac3dec->downmix.downmix_3f_1r_to_2ch (p_ac3dec->samples[0], &p_ac3dec->dm_par);
+ break;
+ case 4: /* 2/1 */
+ p_ac3dec->downmix.downmix_2f_1r_to_2ch (p_ac3dec->samples[0], &p_ac3dec->dm_par);
+ break;
+ case 3: /* 3/0 */
+ p_ac3dec->downmix.downmix_3f_0r_to_2ch (p_ac3dec->samples[0], &p_ac3dec->dm_par);
+ break;
+ case 2:
+ break;
+ default: /* 1/0 */
+// if (p_ac3dec->bsi.acmod == 1)
+ center = p_ac3dec->samples[0];
+// else if (p_ac3dec->bsi.acmod == 0)
+// center = samples[ac3_config.dual_mono_ch_sel];
+ do_imdct(&p_ac3dec->imdct, center, p_ac3dec->imdct.delay[0]); /* no downmix*/
+
+ p_ac3dec->downmix.stream_sample_1ch_to_s16 (buffer, center);
- /* Do block 2 */
- tmp_a_r = buf_2[p].real;
- tmp_a_i = buf_2[p].imag;
- tmp_b_r = buf_2[q].real * p_imdct->w[m][k].real - buf_2[q].imag * p_imdct->w[m][k].imag;
- tmp_b_i = buf_2[q].imag * p_imdct->w[m][k].real + buf_2[q].real * p_imdct->w[m][k].imag;
- buf_2[p].real = tmp_a_r + tmp_b_r;
- buf_2[p].imag = tmp_a_i + tmp_b_i;
- buf_2[q].real = tmp_a_r - tmp_b_r;
- buf_2[q].imag = tmp_a_i - tmp_b_i;
- }
+ return;
+ break;
}
- }
- /* Post IFFT complex multiply */
- for (i=0; i < N/8; i++) {
- /* y1[n] = z1[n] * (xcos2[n] + j * xs in2[n]) ; */
- tmp_a_r = buf_1[i].real;
- tmp_a_i = - buf_1[i].imag;
- buf_1[i].real =(tmp_a_r * p_imdct->xcos2[i]) - (tmp_a_i * p_imdct->xsin2[i]);
- buf_1[i].imag =(tmp_a_r * p_imdct->xsin2[i]) + (tmp_a_i * p_imdct->xcos2[i]);
- /* y2[n] = z2[n] * (xcos2[n] + j * xsin2[n]) ; */
- tmp_a_r = buf_2[i].real;
- tmp_a_i = - buf_2[i].imag;
- buf_2[i].real =(tmp_a_r * p_imdct->xcos2[i]) - (tmp_a_i * p_imdct->xsin2[i]);
- buf_2[i].imag =(tmp_a_r * p_imdct->xsin2[i]) + (tmp_a_i * p_imdct->xcos2[i]);
- }
-
- /* Window and convert to real valued signal */
- for (i=0; i<N/8; i++) {
- y[2*i] = -buf_1[i].imag * window[2*i];
- y[2*i+1] = buf_1[N/8-i-1].real * window[2*i+1];
- y[N/4+2*i] = -buf_1[i].real * window[N/4+2*i];
- y[N/4+2*i+1] = buf_1[N/8-i-1].imag * window[N/4+2*i+1];
- y[N/2+2*i] = -buf_2[i].real * window[N/2-2*i-1];
- y[N/2+2*i+1] = buf_2[N/8-i-1].imag * window[N/2-2*i-2];
- y[3*N/4+2*i] = buf_2[i].imag * window[N/4-2*i-1];
- y[3*N/4+2*i+1] = -buf_2[N/8-i-1].real * window[N/4-2*i-2];
- }
+ do_imdct (&p_ac3dec->imdct, p_ac3dec->samples[0], p_ac3dec->imdct.delay[0]);
+ do_imdct (&p_ac3dec->imdct, p_ac3dec->samples[1], p_ac3dec->imdct.delay[1]);
+ p_ac3dec->downmix.stream_sample_2ch_to_s16(buffer, p_ac3dec->samples[0], p_ac3dec->samples[1]);
- /* Overlap and add */
- for (i=0; i<N/2; i++) {
- y[i] = 2 * (y[i] + p_imdct->delay[id][i]);
- p_imdct->delay[id][i] = y[N/2+i];
- }
+ } else {
+ /* imdct and then downmix
+ * delay and samples should be saved and mixed
+ * fprintf(stderr, "time domain downmix\n"); */
+ for (i=0; i<p_ac3dec->bsi.nfchans; i++)
+ {
+ if (p_ac3dec->audblk.blksw[i])
+ /* There is only a C function */
+ imdct_do_256_nol (&p_ac3dec->imdct, p_ac3dec->samples[i], p_ac3dec->imdct.delay1[i]);
+ else
+ p_ac3dec->imdct.imdct_do_512_nol (&p_ac3dec->imdct, p_ac3dec->samples[i], p_ac3dec->imdct.delay1[i]);
+ }
+
+ /* mix the sample, overlap */
+ switch(p_ac3dec->bsi.acmod)
+ {
+ case 7: /* 3/2 */
+ left = p_ac3dec->samples[0];
+ center = p_ac3dec->samples[1];
+ right = p_ac3dec->samples[2];
+ left_sur = p_ac3dec->samples[3];
+ right_sur = p_ac3dec->samples[4];
+ delay_left = p_ac3dec->imdct.delay[0];
+ delay_right = p_ac3dec->imdct.delay[1];
+ delay1_left = p_ac3dec->imdct.delay1[0];
+ delay1_center = p_ac3dec->imdct.delay1[1];
+ delay1_right = p_ac3dec->imdct.delay1[2];
+ delay1_sl = p_ac3dec->imdct.delay1[3];
+ delay1_sr = p_ac3dec->imdct.delay1[4];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = p_ac3dec->dm_par.unit * *left++ + p_ac3dec->dm_par.clev * *center + p_ac3dec->dm_par.slev * *left_sur++;
+ right_tmp= p_ac3dec->dm_par.unit * *right++ + p_ac3dec->dm_par.clev * *center++ + p_ac3dec->dm_par.slev * *right_sur++;
+ *buffer++ = (s16)(left_tmp + *delay_left);
+ *buffer++ = (s16)(right_tmp + *delay_right);
+ *delay_left++ = p_ac3dec->dm_par.unit * *delay1_left++ + p_ac3dec->dm_par.clev * *delay1_center + p_ac3dec->dm_par.slev * *delay1_sl++;
+ *delay_right++ = p_ac3dec->dm_par.unit * *delay1_right++ + p_ac3dec->dm_par.clev * *center++ + p_ac3dec->dm_par.slev * *delay1_sr++;
+ }
+ break;
+ case 6: /* 2/2 */
+ left = p_ac3dec->samples[0];
+ right = p_ac3dec->samples[1];
+ left_sur = p_ac3dec->samples[2];
+ right_sur = p_ac3dec->samples[3];
+ delay_left = p_ac3dec->imdct.delay[0];
+ delay_right = p_ac3dec->imdct.delay[1];
+ delay1_left = p_ac3dec->imdct.delay1[0];
+ delay1_right = p_ac3dec->imdct.delay1[1];
+ delay1_sl = p_ac3dec->imdct.delay1[2];
+ delay1_sr = p_ac3dec->imdct.delay1[3];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = p_ac3dec->dm_par.unit * *left++ + p_ac3dec->dm_par.slev * *left_sur++;
+ right_tmp= p_ac3dec->dm_par.unit * *right++ + p_ac3dec->dm_par.slev * *right_sur++;
+ *buffer++ = (s16)(left_tmp + *delay_left);
+ *buffer++ = (s16)(right_tmp + *delay_right);
+ *delay_left++ = p_ac3dec->dm_par.unit * *delay1_left++ + p_ac3dec->dm_par.slev * *delay1_sl++;
+ *delay_right++ = p_ac3dec->dm_par.unit * *delay1_right++ + p_ac3dec->dm_par.slev * *delay1_sr++;
+ }
+ break;
+ case 5: /* 3/1 */
+ left = p_ac3dec->samples[0];
+ center = p_ac3dec->samples[1];
+ right = p_ac3dec->samples[2];
+ right_sur = p_ac3dec->samples[3];
+ delay_left = p_ac3dec->imdct.delay[0];
+ delay_right = p_ac3dec->imdct.delay[1];
+ delay1_left = p_ac3dec->imdct.delay1[0];
+ delay1_center = p_ac3dec->imdct.delay1[1];
+ delay1_right = p_ac3dec->imdct.delay1[2];
+ delay1_sl = p_ac3dec->imdct.delay1[3];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = p_ac3dec->dm_par.unit * *left++ + p_ac3dec->dm_par.clev * *center - p_ac3dec->dm_par.slev * *right_sur;
+ right_tmp= p_ac3dec->dm_par.unit * *right++ + p_ac3dec->dm_par.clev * *center++ + p_ac3dec->dm_par.slev * *right_sur++;
+ *buffer++ = (s16)(left_tmp + *delay_left);
+ *buffer++ = (s16)(right_tmp + *delay_right);
+ *delay_left++ = p_ac3dec->dm_par.unit * *delay1_left++ + p_ac3dec->dm_par.clev * *delay1_center + p_ac3dec->dm_par.slev * *delay1_sl;
+ *delay_right++ = p_ac3dec->dm_par.unit * *delay1_right++ + p_ac3dec->dm_par.clev * *center++ + p_ac3dec->dm_par.slev * *delay1_sl++;
+ }
+ break;
+ case 4: /* 2/1 */
+ left = p_ac3dec->samples[0];
+ right = p_ac3dec->samples[1];
+ right_sur = p_ac3dec->samples[2];
+ delay_left = p_ac3dec->imdct.delay[0];
+ delay_right = p_ac3dec->imdct.delay[1];
+ delay1_left = p_ac3dec->imdct.delay1[0];
+ delay1_right = p_ac3dec->imdct.delay1[1];
+ delay1_sl = p_ac3dec->imdct.delay1[2];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = p_ac3dec->dm_par.unit * *left++ - p_ac3dec->dm_par.slev * *right_sur;
+ right_tmp= p_ac3dec->dm_par.unit * *right++ + p_ac3dec->dm_par.slev * *right_sur++;
+ *buffer++ = (s16)(left_tmp + *delay_left);
+ *buffer++ = (s16)(right_tmp + *delay_right);
+ *delay_left++ = p_ac3dec->dm_par.unit * *delay1_left++ + p_ac3dec->dm_par.slev * *delay1_sl;
+ *delay_right++ = p_ac3dec->dm_par.unit * *delay1_right++ + p_ac3dec->dm_par.slev * *delay1_sl++;
+ }
+ break;
+ case 3: /* 3/0 */
+ left = p_ac3dec->samples[0];
+ center = p_ac3dec->samples[1];
+ right = p_ac3dec->samples[2];
+ delay_left = p_ac3dec->imdct.delay[0];
+ delay_right = p_ac3dec->imdct.delay[1];
+ delay1_left = p_ac3dec->imdct.delay1[0];
+ delay1_center = p_ac3dec->imdct.delay1[1];
+ delay1_right = p_ac3dec->imdct.delay1[2];
+
+ for (i = 0; i < 256; i++) {
+ left_tmp = p_ac3dec->dm_par.unit * *left++ + p_ac3dec->dm_par.clev * *center;
+ right_tmp= p_ac3dec->dm_par.unit * *right++ + p_ac3dec->dm_par.clev * *center++;
+ *buffer++ = (s16)(left_tmp + *delay_left);
+ *buffer++ = (s16)(right_tmp + *delay_right);
+ *delay_left++ = p_ac3dec->dm_par.unit * *delay1_left++ + p_ac3dec->dm_par.clev * *delay1_center;
+ *delay_right++ = p_ac3dec->dm_par.unit * *delay1_right++ + p_ac3dec->dm_par.clev * *center++;
+ }
+ break;
+ case 2: /* copy to output */
+ for (i = 0; i < 256; i++) {
+ *buffer++ = (s16)p_ac3dec->samples[0][i];
+ *buffer++ = (s16)p_ac3dec->samples[1][i];
+ }
+ break;
+ }
+ }
}
projects / vlc / blobdiff