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An AltiVec-enhanced IMDCT for liba52 (liba52/imdct.c)
It's nearly bit-perfect, I have a couple of lsb
changed in a 128 frames sample. I can't hear the
differences :-)
patch by Romain Dolbeau <dolbeau@irisa.fr>
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9002 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi
parent
5ef9bfab29
commit
418e699d7e
@ -7,6 +7,9 @@ SRCS = crc.c resample.c bit_allocate.c bitstream.c downmix.c imdct.c imdct_ml
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OBJS = $(SRCS:.c=.o)
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CFLAGS = $(MLIB_INC) $(OPTFLAGS)
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ifeq ($(TARGET_ALTIVEC),yes)
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CFLAGS+= -faltivec
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endif
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.SUFFIXES: .c .o
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372
liba52/imdct.c
372
liba52/imdct.c
@ -23,6 +23,7 @@
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* SSE optimizations from Michael Niedermayer (michaelni@gmx.at)
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* 3DNOW optimizations from Nick Kurshev <nickols_k@mail.ru>
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* michael did port them from libac3 (untested, perhaps totally broken)
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* AltiVec optimizations from Romain Dolbeau (romain@dolbeau.org)
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*/
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#include "config.h"
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@ -114,24 +115,24 @@ static float __attribute__((aligned(16))) *sseW[7]=
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{NULL /*sseW0*/,sseW1,sseW2,sseW3,sseW4,sseW5,sseW6};
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static float __attribute__((aligned(16))) sseWindow[512];
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#else
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static complex_t buf[128];
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static complex_t __attribute__((aligned(16))) buf[128];
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#endif
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/* Twiddle factor LUT */
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static complex_t w_1[1];
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static complex_t w_2[2];
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static complex_t w_4[4];
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static complex_t w_8[8];
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static complex_t w_16[16];
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static complex_t w_32[32];
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static complex_t w_64[64];
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static complex_t * w[7] = {w_1, w_2, w_4, w_8, w_16, w_32, w_64};
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static complex_t __attribute__((aligned(16))) w_1[1];
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static complex_t __attribute__((aligned(16))) w_2[2];
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static complex_t __attribute__((aligned(16))) w_4[4];
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static complex_t __attribute__((aligned(16))) w_8[8];
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static complex_t __attribute__((aligned(16))) w_16[16];
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static complex_t __attribute__((aligned(16))) w_32[32];
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static complex_t __attribute__((aligned(16))) w_64[64];
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static complex_t __attribute__((aligned(16))) * w[7] = {w_1, w_2, w_4, w_8, w_16, w_32, w_64};
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/* Twiddle factors for IMDCT */
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static sample_t xcos1[128];
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static sample_t xsin1[128];
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static sample_t xcos2[64];
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static sample_t xsin2[64];
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static sample_t __attribute__((aligned(16))) xcos1[128];
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static sample_t __attribute__((aligned(16))) xsin1[128];
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static sample_t __attribute__((aligned(16))) xcos2[64];
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static sample_t __attribute__((aligned(16))) xsin2[64];
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/* Windowing function for Modified DCT - Thank you acroread */
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sample_t imdct_window[] = {
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@ -384,6 +385,343 @@ imdct_do_512(sample_t data[],sample_t delay[], sample_t bias)
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}
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}
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#ifdef HAVE_ALTIVEC
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// used to build registers permutation vectors (vcprm)
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// the 's' are for words in the _s_econd vector
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#define WORD_0 0x00,0x01,0x02,0x03
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#define WORD_1 0x04,0x05,0x06,0x07
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#define WORD_2 0x08,0x09,0x0a,0x0b
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#define WORD_3 0x0c,0x0d,0x0e,0x0f
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#define WORD_s0 0x10,0x11,0x12,0x13
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#define WORD_s1 0x14,0x15,0x16,0x17
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#define WORD_s2 0x18,0x19,0x1a,0x1b
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#define WORD_s3 0x1c,0x1d,0x1e,0x1f
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#define vcprm(a,b,c,d) (const vector unsigned char)(WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d)
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// vcprmle is used to keep the same index as in the SSE version.
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// it's the same as vcprm, with the index inversed
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// ('le' is Little Endian)
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#define vcprmle(a,b,c,d) vcprm(d,c,b,a)
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// used to build inverse/identity vectors (vcii)
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// n is _n_egative, p is _p_ositive
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#define FLOAT_n -1.
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#define FLOAT_p 1.
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#define vcii(a,b,c,d) (const vector float)(FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d)
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void
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imdct_do_512_altivec(sample_t data[],sample_t delay[], sample_t bias)
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{
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int i;
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int k;
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int p,q;
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int m;
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int two_m;
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int two_m_plus_one;
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sample_t tmp_b_i;
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sample_t tmp_b_r;
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sample_t tmp_a_i;
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sample_t tmp_a_r;
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sample_t *data_ptr;
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sample_t *delay_ptr;
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sample_t *window_ptr;
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/* 512 IMDCT with source and dest data in 'data' */
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/* Pre IFFT complex multiply plus IFFT cmplx conjugate & reordering*/
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for( i=0; i < 128; i++) {
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/* z[i] = (X[256-2*i-1] + j * X[2*i]) * (xcos1[i] + j * xsin1[i]) ; */
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int j= bit_reverse_512[i];
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buf[i].real = (data[256-2*j-1] * xcos1[j]) - (data[2*j] * xsin1[j]);
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buf[i].imag = -1.0 * ((data[2*j] * xcos1[j]) + (data[256-2*j-1] * xsin1[j]));
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}
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/* 1. iteration */
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for(i = 0; i < 128; i += 2) {
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#if 0
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tmp_a_r = buf[i].real;
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tmp_a_i = buf[i].imag;
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tmp_b_r = buf[i+1].real;
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tmp_b_i = buf[i+1].imag;
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buf[i].real = tmp_a_r + tmp_b_r;
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buf[i].imag = tmp_a_i + tmp_b_i;
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buf[i+1].real = tmp_a_r - tmp_b_r;
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buf[i+1].imag = tmp_a_i - tmp_b_i;
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#else
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vector float temp, bufv;
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bufv = vec_ld(i << 3, (float*)buf);
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temp = vec_perm(bufv, bufv, vcprm(2,3,0,1));
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bufv = vec_madd(bufv, vcii(p,p,n,n), temp);
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vec_st(bufv, i << 3, (float*)buf);
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#endif
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}
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/* 2. iteration */
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// Note w[1]={{1,0}, {0,-1}}
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for(i = 0; i < 128; i += 4) {
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#if 0
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tmp_a_r = buf[i].real;
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tmp_a_i = buf[i].imag;
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tmp_b_r = buf[i+2].real;
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tmp_b_i = buf[i+2].imag;
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buf[i].real = tmp_a_r + tmp_b_r;
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buf[i].imag = tmp_a_i + tmp_b_i;
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buf[i+2].real = tmp_a_r - tmp_b_r;
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buf[i+2].imag = tmp_a_i - tmp_b_i;
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tmp_a_r = buf[i+1].real;
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tmp_a_i = buf[i+1].imag;
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/* WARNING: im <-> re here ! */
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tmp_b_r = buf[i+3].imag;
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tmp_b_i = buf[i+3].real;
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buf[i+1].real = tmp_a_r + tmp_b_r;
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buf[i+1].imag = tmp_a_i - tmp_b_i;
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buf[i+3].real = tmp_a_r - tmp_b_r;
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buf[i+3].imag = tmp_a_i + tmp_b_i;
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#else
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vector float buf01, buf23, temp1, temp2;
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buf01 = vec_ld((i + 0) << 3, (float*)buf);
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buf23 = vec_ld((i + 2) << 3, (float*)buf);
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buf23 = vec_perm(buf23,buf23,vcprm(0,1,3,2));
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temp1 = vec_madd(buf23, vcii(p,p,p,n), buf01);
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temp2 = vec_madd(buf23, vcii(n,n,n,p), buf01);
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vec_st(temp1, (i + 0) << 3, (float*)buf);
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vec_st(temp2, (i + 2) << 3, (float*)buf);
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#endif
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}
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/* 3. iteration */
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for(i = 0; i < 128; i += 8) {
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#if 0
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tmp_a_r = buf[i].real;
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tmp_a_i = buf[i].imag;
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tmp_b_r = buf[i+4].real;
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tmp_b_i = buf[i+4].imag;
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buf[i].real = tmp_a_r + tmp_b_r;
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buf[i].imag = tmp_a_i + tmp_b_i;
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buf[i+4].real = tmp_a_r - tmp_b_r;
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buf[i+4].imag = tmp_a_i - tmp_b_i;
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tmp_a_r = buf[1+i].real;
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tmp_a_i = buf[1+i].imag;
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tmp_b_r = (buf[i+5].real + buf[i+5].imag) * w[2][1].real;
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tmp_b_i = (buf[i+5].imag - buf[i+5].real) * w[2][1].real;
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buf[1+i].real = tmp_a_r + tmp_b_r;
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buf[1+i].imag = tmp_a_i + tmp_b_i;
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buf[i+5].real = tmp_a_r - tmp_b_r;
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buf[i+5].imag = tmp_a_i - tmp_b_i;
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tmp_a_r = buf[i+2].real;
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tmp_a_i = buf[i+2].imag;
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/* WARNING re <-> im & sign */
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tmp_b_r = buf[i+6].imag;
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tmp_b_i = - buf[i+6].real;
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buf[i+2].real = tmp_a_r + tmp_b_r;
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buf[i+2].imag = tmp_a_i + tmp_b_i;
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buf[i+6].real = tmp_a_r - tmp_b_r;
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buf[i+6].imag = tmp_a_i - tmp_b_i;
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tmp_a_r = buf[i+3].real;
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tmp_a_i = buf[i+3].imag;
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tmp_b_r = (buf[i+7].real - buf[i+7].imag) * w[2][3].imag;
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tmp_b_i = (buf[i+7].imag + buf[i+7].real) * w[2][3].imag;
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buf[i+3].real = tmp_a_r + tmp_b_r;
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buf[i+3].imag = tmp_a_i + tmp_b_i;
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buf[i+7].real = tmp_a_r - tmp_b_r;
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buf[i+7].imag = tmp_a_i - tmp_b_i;
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#else
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vector float buf01, buf23, buf45, buf67;
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buf01 = vec_ld((i + 0) << 3, (float*)buf);
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buf23 = vec_ld((i + 2) << 3, (float*)buf);
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tmp_b_r = (buf[i+5].real + buf[i+5].imag) * w[2][1].real;
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tmp_b_i = (buf[i+5].imag - buf[i+5].real) * w[2][1].real;
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buf[i+5].real = tmp_b_r;
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buf[i+5].imag = tmp_b_i;
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tmp_b_r = (buf[i+7].real - buf[i+7].imag) * w[2][3].imag;
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tmp_b_i = (buf[i+7].imag + buf[i+7].real) * w[2][3].imag;
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buf[i+7].real = tmp_b_r;
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buf[i+7].imag = tmp_b_i;
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buf23 = vec_ld((i + 2) << 3, (float*)buf);
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buf45 = vec_ld((i + 4) << 3, (float*)buf);
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buf67 = vec_ld((i + 6) << 3, (float*)buf);
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buf67 = vec_perm(buf67, buf67, vcprm(1,0,2,3));
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vec_st(vec_add(buf01, buf45), (i + 0) << 3, (float*)buf);
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vec_st(vec_madd(buf67, vcii(p,n,p,p), buf23), (i + 2) << 3, (float*)buf);
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vec_st(vec_sub(buf01, buf45), (i + 4) << 3, (float*)buf);
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vec_st(vec_nmsub(buf67, vcii(p,n,p,p), buf23), (i + 6) << 3, (float*)buf);
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#endif
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}
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/* 4-7. iterations */
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for (m=3; m < 7; m++) {
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two_m = (1 << m);
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two_m_plus_one = two_m<<1;
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for(i = 0; i < 128; i += two_m_plus_one) {
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for(k = 0; k < two_m; k+=2) {
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#if 0
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int p = k + i;
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int q = p + two_m;
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tmp_a_r = buf[p].real;
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tmp_a_i = buf[p].imag;
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tmp_b_r =
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buf[q].real * w[m][k].real -
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buf[q].imag * w[m][k].imag;
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tmp_b_i =
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buf[q].imag * w[m][k].real +
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buf[q].real * w[m][k].imag;
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buf[p].real = tmp_a_r + tmp_b_r;
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buf[p].imag = tmp_a_i + tmp_b_i;
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buf[q].real = tmp_a_r - tmp_b_r;
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buf[q].imag = tmp_a_i - tmp_b_i;
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tmp_a_r = buf[(p + 1)].real;
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tmp_a_i = buf[(p + 1)].imag;
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tmp_b_r =
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buf[(q + 1)].real * w[m][(k + 1)].real -
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buf[(q + 1)].imag * w[m][(k + 1)].imag;
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tmp_b_i =
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buf[(q + 1)].imag * w[m][(k + 1)].real +
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buf[(q + 1)].real * w[m][(k + 1)].imag;
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buf[(p + 1)].real = tmp_a_r + tmp_b_r;
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buf[(p + 1)].imag = tmp_a_i + tmp_b_i;
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buf[(q + 1)].real = tmp_a_r - tmp_b_r;
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buf[(q + 1)].imag = tmp_a_i - tmp_b_i;
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#else
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int p = k + i;
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int q = p + two_m;
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vector float vecp, vecq, vecw, temp1, temp2, temp3, temp4;
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const vector float vczero = (const vector float)(0);
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// first compute buf[q] and buf[q+1]
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vecq = vec_ld(q << 3, (float*)buf);
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vecw = vec_ld(0, (float*)&(w[m][k]));
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temp1 = vec_madd(vecq, vecw, vczero);
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temp2 = vec_perm(vecq, vecq, vcprm(1,0,3,2));
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temp2 = vec_madd(temp2, vecw, vczero);
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temp3 = vec_perm(temp1, temp2, vcprm(0,s0,2,s2));
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temp4 = vec_perm(temp1, temp2, vcprm(1,s1,3,s3));
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vecq = vec_madd(temp4, vcii(n,p,n,p), temp3);
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// then butterfly with buf[p] and buf[p+1]
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vecp = vec_ld(p << 3, (float*)buf);
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temp1 = vec_add(vecp, vecq);
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temp2 = vec_sub(vecp, vecq);
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vec_st(temp1, p << 3, (float*)buf);
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vec_st(temp2, q << 3, (float*)buf);
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#endif
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}
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}
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}
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/* Post IFFT complex multiply plus IFFT complex conjugate*/
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for( i=0; i < 128; i+=4) {
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/* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */
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#if 0
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tmp_a_r = buf[(i + 0)].real;
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tmp_a_i = -1.0 * buf[(i + 0)].imag;
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buf[(i + 0)].real =
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(tmp_a_r * xcos1[(i + 0)]) - (tmp_a_i * xsin1[(i + 0)]);
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buf[(i + 0)].imag =
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(tmp_a_r * xsin1[(i + 0)]) + (tmp_a_i * xcos1[(i + 0)]);
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tmp_a_r = buf[(i + 1)].real;
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tmp_a_i = -1.0 * buf[(i + 1)].imag;
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buf[(i + 1)].real =
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(tmp_a_r * xcos1[(i + 1)]) - (tmp_a_i * xsin1[(i + 1)]);
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buf[(i + 1)].imag =
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(tmp_a_r * xsin1[(i + 1)]) + (tmp_a_i * xcos1[(i + 1)]);
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tmp_a_r = buf[(i + 2)].real;
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tmp_a_i = -1.0 * buf[(i + 2)].imag;
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buf[(i + 2)].real =
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(tmp_a_r * xcos1[(i + 2)]) - (tmp_a_i * xsin1[(i + 2)]);
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buf[(i + 2)].imag =
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(tmp_a_r * xsin1[(i + 2)]) + (tmp_a_i * xcos1[(i + 2)]);
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tmp_a_r = buf[(i + 3)].real;
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tmp_a_i = -1.0 * buf[(i + 3)].imag;
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buf[(i + 3)].real =
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(tmp_a_r * xcos1[(i + 3)]) - (tmp_a_i * xsin1[(i + 3)]);
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buf[(i + 3)].imag =
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(tmp_a_r * xsin1[(i + 3)]) + (tmp_a_i * xcos1[(i + 3)]);
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#else
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vector float bufv_0, bufv_2, cosv, sinv, temp1, temp2;
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vector float temp0022, temp1133, tempCS01;
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const vector float vczero = (const vector float)(0);
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bufv_0 = vec_ld((i + 0) << 3, (float*)buf);
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bufv_2 = vec_ld((i + 2) << 3, (float*)buf);
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cosv = vec_ld(i << 2, xcos1);
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sinv = vec_ld(i << 2, xsin1);
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temp0022 = vec_perm(bufv_0, bufv_0, vcprm(0,0,2,2));
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temp1133 = vec_perm(bufv_0, bufv_0, vcprm(1,1,3,3));
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tempCS01 = vec_perm(cosv, sinv, vcprm(0,s0,1,s1));
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temp1 = vec_madd(temp0022, tempCS01, vczero);
|
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tempCS01 = vec_perm(cosv, sinv, vcprm(s0,0,s1,1));
|
||||
temp2 = vec_madd(temp1133, tempCS01, vczero);
|
||||
bufv_0 = vec_madd(temp2, vcii(p,n,p,n), temp1);
|
||||
|
||||
vec_st(bufv_0, (i + 0) << 3, (float*)buf);
|
||||
|
||||
/* idem with bufv_2 and high-order cosv/sinv */
|
||||
|
||||
temp0022 = vec_perm(bufv_2, bufv_2, vcprm(0,0,2,2));
|
||||
temp1133 = vec_perm(bufv_2, bufv_2, vcprm(1,1,3,3));
|
||||
tempCS01 = vec_perm(cosv, sinv, vcprm(2,s2,3,s3));
|
||||
temp1 = vec_madd(temp0022, tempCS01, vczero);
|
||||
tempCS01 = vec_perm(cosv, sinv, vcprm(s2,2,s3,3));
|
||||
temp2 = vec_madd(temp1133, tempCS01, vczero);
|
||||
bufv_2 = vec_madd(temp2, vcii(p,n,p,n), temp1);
|
||||
|
||||
vec_st(bufv_2, (i + 2) << 3, (float*)buf);
|
||||
|
||||
#endif
|
||||
}
|
||||
|
||||
data_ptr = data;
|
||||
delay_ptr = delay;
|
||||
window_ptr = imdct_window;
|
||||
|
||||
/* Window and convert to real valued signal */
|
||||
for(i=0; i< 64; i++) {
|
||||
*data_ptr++ = -buf[64+i].imag * *window_ptr++ + *delay_ptr++ + bias;
|
||||
*data_ptr++ = buf[64-i-1].real * *window_ptr++ + *delay_ptr++ + bias;
|
||||
}
|
||||
|
||||
for(i=0; i< 64; i++) {
|
||||
*data_ptr++ = -buf[i].real * *window_ptr++ + *delay_ptr++ + bias;
|
||||
*data_ptr++ = buf[128-i-1].imag * *window_ptr++ + *delay_ptr++ + bias;
|
||||
}
|
||||
|
||||
/* The trailing edge of the window goes into the delay line */
|
||||
delay_ptr = delay;
|
||||
|
||||
for(i=0; i< 64; i++) {
|
||||
*delay_ptr++ = -buf[64+i].real * *--window_ptr;
|
||||
*delay_ptr++ = buf[64-i-1].imag * *--window_ptr;
|
||||
}
|
||||
|
||||
for(i=0; i<64; i++) {
|
||||
*delay_ptr++ = buf[i].imag * *--window_ptr;
|
||||
*delay_ptr++ = -buf[128-i-1].real * *--window_ptr;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
// Stuff below this line is borrowed from libac3
|
||||
#include "srfftp.h"
|
||||
#ifdef ARCH_X86
|
||||
@ -965,6 +1303,14 @@ void imdct_init (uint32_t mm_accel)
|
||||
}
|
||||
else
|
||||
#endif // arch_x86
|
||||
#ifdef HAVE_ALTIVEC
|
||||
if (mm_accel & MM_ACCEL_PPC_ALTIVEC)
|
||||
{
|
||||
fprintf(stderr, "Using AltiVec optimized IMDCT transform\n");
|
||||
imdct_512 = imdct_do_512_altivec;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
fprintf (stderr, "No accelerated IMDCT transform found\n");
|
||||
imdct_256 = imdct_do_256;
|
||||
}
|
||||
|
||||
@ -34,6 +34,9 @@
|
||||
#define MM_ACCEL_X86_MMXEXT 0x20000000
|
||||
#define MM_ACCEL_X86_SSE 0x10000000
|
||||
|
||||
/* PPC accelerations */
|
||||
#define MM_ACCEL_PPC_ALTIVEC 0x00010000
|
||||
|
||||
uint32_t mm_accel (void);
|
||||
|
||||
#endif /* MM_ACCEL_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user