diff options
Diffstat (limited to 'libavcodec/bfin/idct_bfin.S')
| -rw-r--r-- | libavcodec/bfin/idct_bfin.S | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/libavcodec/bfin/idct_bfin.S b/libavcodec/bfin/idct_bfin.S new file mode 100644 index 0000000000..f6904c189b --- /dev/null +++ b/libavcodec/bfin/idct_bfin.S @@ -0,0 +1,297 @@ +/* + * idct BlackFin + * + * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +/* + This blackfin DSP code implements an 8x8 inverse type II DCT. + +Prototype : void ff_bfin_idct(DCTELEM *in) + +Registers Used : A0, A1, R0-R7, I0-I3, B0, B2, B3, M0-M2, L0-L3, P0-P5, LC0. + +Performance : + Code Size : 498 Bytes. + Cycle Count : 417 Cycles + + +----------------------------------------------------------- +FFMPEG conformance testing results +----------------------------------------------------------- + +dct-test: modified with the following + dct_error("BFINidct", 1, ff_bfin_idct, idct, test); +produces the following output + +root:/u/ffmpeg/bhead/libavcodec> ./dct-test -i +ffmpeg DCT/IDCT test + + 8 15 -2 21 24 17 0 10 + 2 -10 -5 -5 -3 7 -14 -3 + 2 -13 -10 -19 18 -6 6 -2 + 9 4 16 -3 9 12 10 15 + 15 -9 -2 10 1 16 0 -15 + -15 5 7 3 13 0 13 20 + -6 -15 24 9 -18 1 9 -22 + -8 25 23 2 -7 0 30 13 +IDCT BFINidct: err_inf=1 err2=0.01002344 syserr=0.00150000 maxout=266 blockSumErr=64 +IDCT BFINidct: 88.3 kdct/s + +*/ + +#include "config_bfin.h" + +.section .l1.data.B,"aw",@progbits + +.align 4; +coefs: +.short 0x5a82; // C4 +.short 0x5a82; // C4 +.short 0x30FC; //cos(3pi/8) C6 +.short 0x7642; //cos(pi/8) C2 +.short 0x18F9; //cos(7pi/16) +.short 0x7D8A; //cos(pi/16) +.short 0x471D; //cos(5pi/16) +.short 0x6A6E; //cos(3pi/16) +.short 0x18F9; //cos(7pi/16) +.short 0x7D8A; //cos(pi/16) + +.section .l1.data.A + +vtmp: .space 256 + +#define TMP0 FP-8 +#define TMP1 FP-12 +#define TMP2 FP-16 + + +DEFUN(idct,mL1, + (DCTELEM *block)): + +/********************** Function Prologue *********************************/ + link 16; + [--SP] = (R7:4, P5:3); // Push the registers onto the stack. + B0 = R0; // Pointer to Input matrix + R1 = [P3+coefs@GOT17M4]; // Pointer to Coefficients + R2 = [P3+vtmp@GOT17M4]; // Pointer to Temporary matrix + B3 = R1; + B2 = R2; + L3 = 20; // L3 is used for making the coefficient array + // circular. + // MUST BE RESTORED TO ZERO at function exit. + M1 = 16 (X); // All these registers are initialized for + M3 = 8(X); // modifying address offsets. + + I0 = B0; // I0 points to Input Element (0, 0). + I2 = B0; // I2 points to Input Element (0, 0). + I2 += M3 || R0.H = W[I0]; + // Element 0 is read into R0.H + I1 = I2; // I1 points to input Element (0, 6). + I1 += 4 || R0.L = W[I2++]; + // I2 points to input Element (0, 4). + // Element 4 is read into R0.L. + P2 = 8 (X); + P3 = 32 (X); + P4 = -32 (X); + P5 = 98 (X); + R7 = 0x8000(Z); + I3 = B3; // I3 points to Coefficients + P0 = B2; // P0 points to array Element (0, 0) of temp + P1 = B2; + R7 = [I3++] || [TMP2]=R7; // Coefficient C4 is read into R7.H and R7.L. + MNOP; + NOP; + + /* + * A1 = Y0 * cos(pi/4) + * A0 = Y0 * cos(pi/4) + * A1 = A1 + Y4 * cos(pi/4) + * A0 = A0 - Y4 * cos(pi/4) + * load: + * R1=(Y2,Y6) + * R7=(C2,C6) + * res: + * R3=Y0, R2=Y4 + */ + A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || I0+= 4 || R1.L=W[I1++]; + R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || R1.H=W[I0--] || R7=[I3++]; + + LSETUP (.0, .1) LC0 = P2; // perform 8 1d idcts + + P2 = 112 (X); + P1 = P1 + P2; // P1 points to element (7, 0) of temp buffer. + P2 = -94(X); + +.0: + /* + * A1 = Y2 * cos(3pi/8) + * A0 = Y2 * cos(pi/8) + * A1 = A1 - Y6 * cos(pi/8) + * A0 = A0 + Y6 * cos(3pi/8) + * R5 = (Y1,Y7) + * R7 = (C1,C7) + * res: + * R1=Y2, R0=Y6 + */ + A1=R7.L*R1.H, A0=R7.H*R1.H (IS) || I0+=4 || R5.H=W[I0]; + R1=(A1-=R7.H*R1.L), R0=(A0+=R7.L*R1.L) (IS) || R5.L=W[I1--] || R7=[I3++]; + /* + * Y0 = Y0 + Y6. + * Y4 = Y4 + Y2. + * Y2 = Y4 - Y2. + * Y6 = Y0 - Y6. + * R3 is saved + * R6.l=Y3 + * note: R3: Y0, R2: Y4, R1: Y2, R0: Y6 + */ + R3=R3+R0, R0=R3-R0; + R2=R2+R1, R1=R2-R1 || [TMP0]=R3 || R6.L=W[I0--]; + /* + * Compute the odd portion (1,3,5,7) even is done. + * + * Y1 = C7 * Y1 - C1 * Y7 + C3 * Y5 - C5 * Y3. + * Y7 = C1 * Y1 + C7 * Y7 + C5 * Y5 + C3 * Y3. + * Y5 = C5 * Y1 + C3 * Y7 + C7 * Y5 - C1 * Y3. + * Y3 = C3 * Y1 - C5 * Y7 - C1 * Y5 - C7 * Y3. + */ + // R5=(Y1,Y7) R6=(Y5,Y3) // R7=(C1,C7) + A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || [TMP1]=R2 || R6.H=W[I2--]; + A1-=R7.H*R5.L, A0+=R7.L*R5.L (IS) || I0-=4 || R7=[I3++]; + A1+=R7.H*R6.H, A0+=R7.L*R6.H (IS) || I0+=M1; // R7=(C3,C5) + R3 =(A1-=R7.L*R6.L), R2 =(A0+=R7.H*R6.L) (IS); + A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || R4=[TMP0]; + A1+=R7.H*R5.L, A0-=R7.L*R5.L (IS) || I1+=M1 || R7=[I3++]; // R7=(C1,C7) + A1+=R7.L*R6.H, A0-=R7.H*R6.H (IS); + R7 =(A1-=R7.H*R6.L), R6 =(A0-=R7.L*R6.L) (IS) || I2+=M1; + // R3=Y1, R2=Y7, R7=Y5, R6=Y3 + + /* Transpose write column. */ + R5.H=R4+R2 (RND12); // Y0=Y0+Y7 + R5.L=R4-R2 (RND12) || R4 = [TMP1]; // Y7=Y7-Y0 + R2.H=R1+R7 (RND12) || W[P0++P3]=R5.H; // Y2=Y2+Y5 st Y0 + R2.L=R1-R7 (RND12) || W[P1++P4]=R5.L || R7=[I3++]; // Y5=Y2-Y5 st Y7 + R5.H=R0-R3 (RND12) || W[P0++P3]=R2.H || R1.L=W[I1++]; // Y1=Y6-Y1 st Y2 + R5.L=R0+R3 (RND12) || W[P1++P4]=R2.L || R0.H=W[I0++]; // Y6=Y6+Y1 st Y5 + R3.H=R4-R6 (RND12) || W[P0++P3]=R5.H || R0.L=W[I2++]; // Y3=Y3-Y4 st Y1 + R3.L=R4+R6 (RND12) || W[P1++P4]=R5.L || R1.H=W[I0++]; // Y4=Y3+Y4 st Y6 + + /* pipeline loop start, + drain Y3, Y4 */ + A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || W[P0++P2]= R3.H || R1.H = W[I0--]; +.1: R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || W[P1++P5]= R3.L || R7 = [I3++]; + + + + I0 = B2; // I0 points to Input Element (0, 0) + I2 = B2; // I2 points to Input Element (0, 0) + I2 += M3 || R0.H = W[I0]; + // Y0 is read in R0.H + I1 = I2; // I1 points to input Element (0, 6) + I1 += 4 || R0.L = W[I2++]; + // I2 points to input Element (0, 4) + // Y4 is read in R0.L + P2 = 8 (X); + I3 = B3; // I3 points to Coefficients + P0 = B0; // P0 points to array Element (0, 0) for writing + // output + P1 = B0; + R7 = [I3++]; // R7.H = C4 and R7.L = C4 + NOP; + + /* + * A1 = Y0 * cos(pi/4) + * A0 = Y0 * cos(pi/4) + * A1 = A1 + Y4 * cos(pi/4) + * A0 = A0 - Y4 * cos(pi/4) + * load: + * R1=(Y2,Y6) + * R7=(C2,C6) + * res: + * R3=Y0, R2=Y4 + */ + A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || I0+=4 || R1.L=W[I1++]; + R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || R1.H=W[I0--] || R7=[I3++]; + + LSETUP (.2, .3) LC0 = P2; // peform 8 1d idcts + P2 = 112 (X); + P1 = P1 + P2; + P2 = -94(X); + +.2: + /* + * A1 = Y2 * cos(3pi/8) + * A0 = Y2 * cos(pi/8) + * A1 = A1 - Y6 * cos(pi/8) + * A0 = A0 + Y6 * cos(3pi/8) + * R5 = (Y1,Y7) + * R7 = (C1,C7) + * res: + * R1=Y2, R0=Y6 + */ + A1=R7.L*R1.H, A0=R7.H*R1.H (IS) || I0+=4 || R5.H=W[I0]; + R1=(A1-=R7.H*R1.L), R0=(A0+=R7.L*R1.L) (IS) || R5.L=W[I1--] || R7=[I3++]; + /* + * Y0 = Y0 + Y6. + * Y4 = Y4 + Y2. + * Y2 = Y4 - Y2. + * Y6 = Y0 - Y6. + * R3 is saved + * R6.l=Y3 + * note: R3: Y0, R2: Y4, R1: Y2, R0: Y6 + */ + R3=R3+R0, R0=R3-R0; + R2=R2+R1, R1=R2-R1 || [TMP0]=R3 || R6.L=W[I0--]; + /* + * Compute the odd portion (1,3,5,7) even is done. + * + * Y1 = C7 * Y1 - C1 * Y7 + C3 * Y5 - C5 * Y3. + * Y7 = C1 * Y1 + C7 * Y7 + C5 * Y5 + C3 * Y3. + * Y5 = C5 * Y1 + C3 * Y7 + C7 * Y5 - C1 * Y3. + * Y3 = C3 * Y1 - C5 * Y7 - C1 * Y5 - C7 * Y3. + */ + // R5=(Y1,Y7) R6=(Y5,Y3) // R7=(C1,C7) + A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || [TMP1]=R2 || R6.H=W[I2--]; + A1-=R7.H*R5.L, A0+=R7.L*R5.L (IS) || I0-=4 || R7=[I3++]; + A1+=R7.H*R6.H, A0+=R7.L*R6.H (IS) || I0+=M1; // R7=(C3,C5) + R3 =(A1-=R7.L*R6.L), R2 =(A0+=R7.H*R6.L) (IS); + A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || R4=[TMP0]; + A1+=R7.H*R5.L, A0-=R7.L*R5.L (IS) || I1+=M1 || R7=[I3++]; // R7=(C1,C7) + A1+=R7.L*R6.H, A0-=R7.H*R6.H (IS); + R7 =(A1-=R7.H*R6.L), R6 =(A0-=R7.L*R6.L) (IS) || I2+=M1; + // R3=Y1, R2=Y7, R7=Y5, R6=Y3 + + /* Transpose write column. */ + R5.H=R4+R2 (RND20); // Y0=Y0+Y7 + R5.L=R4-R2 (RND20) || R4 = [TMP1]; // Y7=Y7-Y0 + R2.H=R1+R7 (RND20) || W[P0++P3]=R5.H; // Y2=Y2+Y5 st Y0 + R2.L=R1-R7 (RND20) || W[P1++P4]=R5.L || R7=[I3++]; // Y5=Y2-Y5 st Y7 + R5.H=R0-R3 (RND20) || W[P0++P3]=R2.H || R1.L=W[I1++]; // Y1=Y6-Y1 st Y2 + R5.L=R0+R3 (RND20) || W[P1++P4]=R2.L || R0.H=W[I0++]; // Y6=Y6+Y1 st Y5 + R3.H=R4-R6 (RND20) || W[P0++P3]=R5.H || R0.L=W[I2++]; // Y3=Y3-Y4 st Y1 + R3.L=R4+R6 (RND20) || W[P1++P4]=R5.L || R1.H=W[I0++]; // Y4=Y3+Y4 st Y6 + + /* pipeline loop start, + drain Y3, Y4 */ + A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || W[P0++P2]= R3.H || R1.H = W[I0--]; +.3: R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || W[P1++P5]= R3.L || R7 = [I3++]; + + L3 = 0; + (R7:4,P5:3)=[SP++]; + unlink; + RTS; + + |