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optimizing imdct12
Originally committed as revision 3929 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
6e0d8c06c7
commit
125d624610
@ -465,7 +465,9 @@ static int decode_init(AVCodecContext * avctx)
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for(i=0;i<36;i++) {
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for(j=0; j<4; j++){
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double d;
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if(j==2) continue;
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if(j==2 && i%3 != 1)
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continue;
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d= sin(M_PI * (i + 0.5) / 36.0);
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if(j==1){
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@ -478,18 +480,16 @@ static int decode_init(AVCodecContext * avctx)
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else if(i< 18) d= 1;
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}
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//merge last stage of imdct into the window coefficients
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if (i/9 == 0) d*= 0.5 / cos(M_PI*(2*( i) +19)/72);
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else if(i/9 == 1) d*= 0.5 / cos(M_PI*(2*(17 - i) +19)/72);
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else if(i/9 == 2) d*= 0.5 / cos(M_PI*(2*( i) +19)/72);
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else d*=-0.5 / cos(M_PI*(2*(17 - i) +19)/72);
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mdct_win[j][i] = FIXHR((d / (1<<5)));
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d*= 0.5 / cos(M_PI*(2*i + 19)/72);
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if(j==2)
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mdct_win[j][i/3] = FIXHR((d / (1<<5)));
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else
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mdct_win[j][i ] = FIXHR((d / (1<<5)));
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// av_log(NULL, AV_LOG_DEBUG, "%2d %d %f\n", i,j,d / (1<<5));
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}
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}
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for(i=0;i<12;i++)
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mdct_win[2][i] = FIXR(sin(M_PI * (i + 0.5) / 12.0));
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/* NOTE: we do frequency inversion adter the MDCT by changing
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the sign of the right window coefs */
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for(j=0;j<4;j++) {
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@ -931,58 +931,62 @@ void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
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*synth_buf_offset = offset;
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}
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/* cos(pi*i/24) */
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#define C1 FIXR(0.99144486137381041114)
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#define C3 FIXR(0.92387953251128675612)
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#define C5 FIXR(0.79335334029123516458)
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#define C7 FIXR(0.60876142900872063941)
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#define C9 FIXR(0.38268343236508977173)
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#define C11 FIXR(0.13052619222005159154)
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#define C3 FIXHR(0.86602540378443864676/2)
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/* 0.5 / cos(pi*(2*i+1)/36) */
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static const int icos36[9] = {
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FIXR(0.50190991877167369479),
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FIXR(0.51763809020504152469), //0
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FIXR(0.55168895948124587824),
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FIXR(0.61038729438072803416),
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FIXR(0.70710678118654752439), //1
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FIXR(0.87172339781054900991),
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FIXR(1.18310079157624925896),
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FIXR(1.93185165257813657349), //2
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FIXR(5.73685662283492756461),
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};
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/* 12 points IMDCT. We compute it "by hand" by factorizing obvious
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cases. */
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static void imdct12(int *out, int *in)
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{
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int tmp;
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int64_t in1_3, in1_9, in4_3, in4_9;
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int in0, in1, in2, in3, in4, in5, t1, t2;
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in0= in[0*3]<<5;
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in1= (in[1*3] + in[0*3])<<5;
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in2= (in[2*3] + in[1*3])<<5;
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in3= (in[3*3] + in[2*3])<<5;
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in4= (in[4*3] + in[3*3])<<5;
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in5= (in[5*3] + in[4*3])<<5;
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in5 += in3;
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in3 += in1;
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in1_3 = MUL64(in[1], C3);
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in1_9 = MUL64(in[1], C9);
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in4_3 = MUL64(in[4], C3);
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in4_9 = MUL64(in[4], C9);
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in2= MULH(2*in2, C3);
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in3= MULH(2*in3, C3);
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tmp = FRAC_RND(MUL64(in[0], C7) - in1_3 - MUL64(in[2], C11) +
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MUL64(in[3], C1) - in4_9 - MUL64(in[5], C5));
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out[0] = tmp;
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out[5] = -tmp;
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tmp = FRAC_RND(MUL64(in[0] - in[3], C9) - in1_3 +
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MUL64(in[2] + in[5], C3) - in4_9);
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out[1] = tmp;
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out[4] = -tmp;
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tmp = FRAC_RND(MUL64(in[0], C11) - in1_9 + MUL64(in[2], C7) -
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MUL64(in[3], C5) + in4_3 - MUL64(in[5], C1));
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out[2] = tmp;
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out[3] = -tmp;
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tmp = FRAC_RND(MUL64(-in[0], C5) + in1_9 + MUL64(in[2], C1) +
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MUL64(in[3], C11) - in4_3 - MUL64(in[5], C7));
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out[6] = tmp;
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out[11] = tmp;
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tmp = FRAC_RND(MUL64(-in[0] + in[3], C3) - in1_9 +
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MUL64(in[2] + in[5], C9) + in4_3);
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out[7] = tmp;
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out[10] = tmp;
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tmp = FRAC_RND(-MUL64(in[0], C1) - in1_3 - MUL64(in[2], C5) -
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MUL64(in[3], C7) - in4_9 - MUL64(in[5], C11));
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out[8] = tmp;
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out[9] = tmp;
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}
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t1 = in0 - in4;
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t2 = MULL(in1 - in5, icos36[4]);
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#undef C1
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#undef C3
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#undef C5
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#undef C7
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#undef C9
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#undef C11
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out[ 7]=
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out[10]= t1 + t2;
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out[ 1]=
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out[ 4]= t1 - t2;
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in0 += in4>>1;
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in4 = in0 + in2;
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in1 += in5>>1;
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in5 = MULL(in1 + in3, icos36[1]);
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out[ 8]=
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out[ 9]= in4 + in5;
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out[ 2]=
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out[ 3]= in4 - in5;
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in0 -= in2;
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in1 = MULL(in1 - in3, icos36[7]);
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out[ 0]=
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out[ 5]= in0 - in1;
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out[ 6]=
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out[11]= in0 + in1;
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}
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/* cos(pi*i/18) */
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#define C1 FIXHR(0.98480775301220805936/2)
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@ -995,18 +999,6 @@ static void imdct12(int *out, int *in)
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#define C8 FIXHR(0.17364817766693034885/2)
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/* 0.5 / cos(pi*(2*i+1)/36) */
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static const int icos36[9] = {
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FIXR(0.50190991877167369479),
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FIXR(0.51763809020504152469),
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FIXR(0.55168895948124587824),
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FIXR(0.61038729438072803416),
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FIXR(0.70710678118654752439),
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FIXR(0.87172339781054900991),
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FIXR(1.18310079157624925896),
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FIXR(1.93185165257813657349),
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FIXR(5.73685662283492756461),
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};
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/* using Lee like decomposition followed by hand coded 9 points DCT */
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static void imdct36(int *out, int *buf, int *in, int *win)
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{
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@ -1092,14 +1084,14 @@ static void imdct36(int *out, int *buf, int *in, int *win)
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t0 = (s0 + s1) << 5;
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t1 = (s0 - s1) << 5;
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out[(9 + j)*SBLIMIT] = -MULH(t1, win[9 + j]) + buf[9 + j];
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out[(9 + j)*SBLIMIT] = MULH(t1, win[9 + j]) + buf[9 + j];
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out[(8 - j)*SBLIMIT] = MULH(t1, win[8 - j]) + buf[8 - j];
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buf[9 + j] = MULH(t0, win[18 + 9 + j]);
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buf[8 - j] = MULH(t0, win[18 + 8 - j]);
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t0 = (s2 + s3) << 5;
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t1 = (s2 - s3) << 5;
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out[(9 + 8 - j)*SBLIMIT] = -MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
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out[(9 + 8 - j)*SBLIMIT] = MULH(t1, win[9 + 8 - j]) + buf[9 + 8 - j];
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out[( j)*SBLIMIT] = MULH(t1, win[ j]) + buf[ j];
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buf[9 + 8 - j] = MULH(t0, win[18 + 9 + 8 - j]);
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buf[ + j] = MULH(t0, win[18 + j]);
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@ -1110,7 +1102,7 @@ static void imdct36(int *out, int *buf, int *in, int *win)
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s1 = MULL(tmp[17], icos36[4]);
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t0 = (s0 + s1) << 5;
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t1 = (s0 - s1) << 5;
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out[(9 + 4)*SBLIMIT] = -MULH(t1, win[9 + 4]) + buf[9 + 4];
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out[(9 + 4)*SBLIMIT] = MULH(t1, win[9 + 4]) + buf[9 + 4];
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out[(8 - 4)*SBLIMIT] = MULH(t1, win[8 - 4]) + buf[8 - 4];
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buf[9 + 4] = MULH(t0, win[18 + 9 + 4]);
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buf[8 - 4] = MULH(t0, win[18 + 8 - 4]);
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@ -1991,11 +1983,9 @@ static void compute_imdct(MPADecodeContext *s,
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int32_t *sb_samples,
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int32_t *mdct_buf)
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{
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int32_t *ptr, *win, *win1, *buf, *buf2, *out_ptr, *ptr1;
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int32_t in[6];
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int32_t out[36];
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int32_t *ptr, *win, *win1, *buf, *out_ptr, *ptr1;
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int32_t out2[12];
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int i, j, k, mdct_long_end, v, sblimit;
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int i, j, mdct_long_end, v, sblimit;
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/* find last non zero block */
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ptr = g->sb_hybrid + 576;
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@ -2036,36 +2026,32 @@ static void compute_imdct(MPADecodeContext *s,
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buf += 18;
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}
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for(j=mdct_long_end;j<sblimit;j++) {
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for(i=0;i<6;i++) {
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out[i] = 0;
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out[6 + i] = 0;
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out[30+i] = 0;
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}
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/* select frequency inversion */
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win = mdct_win[2] + ((4 * 36) & -(j & 1));
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buf2 = out + 6;
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for(k=0;k<3;k++) {
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/* reorder input for short mdct */
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ptr1 = ptr + k;
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for(i=0;i<6;i++) {
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in[i] = *ptr1;
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ptr1 += 3;
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}
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imdct12(out2, in);
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/* apply 12 point window and do small overlap */
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for(i=0;i<6;i++) {
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buf2[i] = MULL(out2[i], win[i]) + buf2[i];
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buf2[i + 6] = MULL(out2[i + 6], win[i + 6]);
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}
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buf2 += 6;
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}
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/* overlap */
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out_ptr = sb_samples + j;
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for(i=0;i<18;i++) {
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*out_ptr = out[i] + buf[i];
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buf[i] = out[i + 18];
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for(i=0; i<6; i++){
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*out_ptr = buf[i];
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out_ptr += SBLIMIT;
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}
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imdct12(out2, ptr + 0);
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for(i=0;i<6;i++) {
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*out_ptr = MULH(out2[i], win[i]) + buf[i + 6*1];
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buf[i + 6*2] = MULH(out2[i + 6], win[i + 6]);
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out_ptr += SBLIMIT;
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}
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imdct12(out2, ptr + 1);
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for(i=0;i<6;i++) {
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*out_ptr = MULH(out2[i], win[i]) + buf[i + 6*2];
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buf[i + 6*0] = MULH(out2[i + 6], win[i + 6]);
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out_ptr += SBLIMIT;
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}
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imdct12(out2, ptr + 2);
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for(i=0;i<6;i++) {
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buf[i + 6*0] = MULH(out2[i], win[i]) + buf[i + 6*0];
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buf[i + 6*1] = MULH(out2[i + 6], win[i + 6]);
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buf[i + 6*2] = 0;
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}
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ptr += 18;
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buf += 18;
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}
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