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233 lines
6.4 KiB
233 lines
6.4 KiB
;***************************************************************************** |
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;* x86-optimized AC-3 DSP functions |
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;* Copyright (c) 2011 Justin Ruggles |
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;* |
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;* This file is part of FFmpeg. |
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;* |
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;* FFmpeg is free software; you can redistribute it and/or |
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;* modify it under the terms of the GNU Lesser General Public |
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;* License as published by the Free Software Foundation; either |
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;* version 2.1 of the License, or (at your option) any later version. |
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;* |
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;* FFmpeg is distributed in the hope that it will be useful, |
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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;* Lesser General Public License for more details. |
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;* |
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;* You should have received a copy of the GNU Lesser General Public |
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;* License along with FFmpeg; if not, write to the Free Software |
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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;****************************************************************************** |
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%include "libavutil/x86/x86util.asm" |
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SECTION_RODATA |
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; 16777216.0f - used in ff_float_to_fixed24() |
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pf_1_24: times 4 dd 0x4B800000 |
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; used in ff_ac3_compute_mantissa_size() |
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cextern ac3_bap_bits |
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pw_bap_mul1: dw 21846, 21846, 0, 32768, 21846, 21846, 0, 32768 |
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pw_bap_mul2: dw 5, 7, 0, 7, 5, 7, 0, 7 |
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; used in ff_ac3_extract_exponents() |
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cextern pd_1 |
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pd_151: times 4 dd 151 |
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SECTION .text |
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;----------------------------------------------------------------------------- |
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; void ff_ac3_exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs) |
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;----------------------------------------------------------------------------- |
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%macro AC3_EXPONENT_MIN 0 |
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cglobal ac3_exponent_min, 3, 4, 2, exp, reuse_blks, expn, offset |
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shl reuse_blksq, 8 |
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jz .end |
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LOOP_ALIGN |
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.nextexp: |
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mov offsetq, reuse_blksq |
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mova m0, [expq+offsetq] |
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sub offsetq, 256 |
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LOOP_ALIGN |
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.nextblk: |
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PMINUB m0, [expq+offsetq], m1 |
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sub offsetq, 256 |
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jae .nextblk |
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mova [expq], m0 |
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add expq, mmsize |
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sub expnq, mmsize |
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jg .nextexp |
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.end: |
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RET |
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%endmacro |
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%define LOOP_ALIGN ALIGN 16 |
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%if HAVE_SSE2_EXTERNAL |
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INIT_XMM sse2 |
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AC3_EXPONENT_MIN |
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%endif |
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%undef LOOP_ALIGN |
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;----------------------------------------------------------------------------- |
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; void ff_float_to_fixed24(int32_t *dst, const float *src, unsigned int len) |
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;----------------------------------------------------------------------------- |
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INIT_XMM sse2 |
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cglobal float_to_fixed24, 3, 3, 9, dst, src, len |
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movaps m0, [pf_1_24] |
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.loop: |
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movaps m1, [srcq ] |
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movaps m2, [srcq+16 ] |
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movaps m3, [srcq+32 ] |
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movaps m4, [srcq+48 ] |
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%ifdef m8 |
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movaps m5, [srcq+64 ] |
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movaps m6, [srcq+80 ] |
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movaps m7, [srcq+96 ] |
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movaps m8, [srcq+112] |
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%endif |
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mulps m1, m0 |
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mulps m2, m0 |
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mulps m3, m0 |
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mulps m4, m0 |
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%ifdef m8 |
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mulps m5, m0 |
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mulps m6, m0 |
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mulps m7, m0 |
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mulps m8, m0 |
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%endif |
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cvtps2dq m1, m1 |
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cvtps2dq m2, m2 |
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cvtps2dq m3, m3 |
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cvtps2dq m4, m4 |
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%ifdef m8 |
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cvtps2dq m5, m5 |
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cvtps2dq m6, m6 |
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cvtps2dq m7, m7 |
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cvtps2dq m8, m8 |
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%endif |
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movdqa [dstq ], m1 |
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movdqa [dstq+16 ], m2 |
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movdqa [dstq+32 ], m3 |
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movdqa [dstq+48 ], m4 |
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%ifdef m8 |
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movdqa [dstq+64 ], m5 |
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movdqa [dstq+80 ], m6 |
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movdqa [dstq+96 ], m7 |
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movdqa [dstq+112], m8 |
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add srcq, 128 |
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add dstq, 128 |
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sub lenq, 32 |
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%else |
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add srcq, 64 |
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add dstq, 64 |
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sub lenq, 16 |
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%endif |
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ja .loop |
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RET |
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;------------------------------------------------------------------------------ |
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; int ff_ac3_compute_mantissa_size(uint16_t mant_cnt[6][16]) |
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;------------------------------------------------------------------------------ |
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%macro PHADDD4 2 ; xmm src, xmm tmp |
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movhlps %2, %1 |
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paddd %1, %2 |
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pshufd %2, %1, 0x1 |
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paddd %1, %2 |
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%endmacro |
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INIT_XMM sse2 |
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cglobal ac3_compute_mantissa_size, 1, 2, 4, mant_cnt, sum |
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movdqa m0, [mant_cntq ] |
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movdqa m1, [mant_cntq+ 1*16] |
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paddw m0, [mant_cntq+ 2*16] |
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paddw m1, [mant_cntq+ 3*16] |
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paddw m0, [mant_cntq+ 4*16] |
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paddw m1, [mant_cntq+ 5*16] |
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paddw m0, [mant_cntq+ 6*16] |
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paddw m1, [mant_cntq+ 7*16] |
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paddw m0, [mant_cntq+ 8*16] |
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paddw m1, [mant_cntq+ 9*16] |
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paddw m0, [mant_cntq+10*16] |
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paddw m1, [mant_cntq+11*16] |
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pmaddwd m0, [ac3_bap_bits ] |
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pmaddwd m1, [ac3_bap_bits+16] |
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paddd m0, m1 |
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PHADDD4 m0, m1 |
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movd sumd, m0 |
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movdqa m3, [pw_bap_mul1] |
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movhpd m0, [mant_cntq +2] |
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movlpd m0, [mant_cntq+1*32+2] |
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movhpd m1, [mant_cntq+2*32+2] |
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movlpd m1, [mant_cntq+3*32+2] |
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movhpd m2, [mant_cntq+4*32+2] |
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movlpd m2, [mant_cntq+5*32+2] |
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pmulhuw m0, m3 |
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pmulhuw m1, m3 |
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pmulhuw m2, m3 |
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paddusw m0, m1 |
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paddusw m0, m2 |
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pmaddwd m0, [pw_bap_mul2] |
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PHADDD4 m0, m1 |
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movd eax, m0 |
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add eax, sumd |
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RET |
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;------------------------------------------------------------------------------ |
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; void ff_ac3_extract_exponents(uint8_t *exp, int32_t *coef, int nb_coefs) |
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;------------------------------------------------------------------------------ |
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%macro PABSD 1-2 ; src/dst, unused |
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%if cpuflag(ssse3) |
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pabsd %1, %1 |
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%else ; src/dst, tmp |
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pxor %2, %2 |
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pcmpgtd %2, %1 |
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pxor %1, %2 |
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psubd %1, %2 |
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%endif |
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%endmacro |
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%macro AC3_EXTRACT_EXPONENTS 0 |
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cglobal ac3_extract_exponents, 3, 3, 4, exp, coef, len |
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add expq, lenq |
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lea coefq, [coefq+4*lenq] |
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neg lenq |
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mova m2, [pd_1] |
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mova m3, [pd_151] |
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.loop: |
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; move 4 32-bit coefs to xmm0 |
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mova m0, [coefq+4*lenq] |
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; absolute value |
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PABSD m0, m1 |
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; convert to float and extract exponents |
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pslld m0, 1 |
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por m0, m2 |
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cvtdq2ps m1, m0 |
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psrld m1, 23 |
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mova m0, m3 |
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psubd m0, m1 |
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; move the lowest byte in each of 4 dwords to the low dword |
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; NOTE: We cannot just extract the low bytes with pshufb because the dword |
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; result for 16777215 is -1 due to float inaccuracy. Using packuswb |
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; clips this to 0, which is the correct exponent. |
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packssdw m0, m0 |
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packuswb m0, m0 |
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movd [expq+lenq], m0 |
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add lenq, 4 |
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jl .loop |
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RET |
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%endmacro |
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%if HAVE_SSE2_EXTERNAL |
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INIT_XMM sse2 |
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AC3_EXTRACT_EXPONENTS |
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%endif |
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%if HAVE_SSSE3_EXTERNAL |
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INIT_XMM ssse3 |
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AC3_EXTRACT_EXPONENTS |
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%endif
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