When decoding coefficients, detect whether the block is DC-only, and take advantage of this knowledge to perform DC-only inverse transform. This is achieved by: - first, changing the 108x4 element modulo_three_table into a 108 element table (kind of base4), and accessing each value using mask and shifts. - then, checking low bits for 0 (as they represent the presence of higher frequency coefficients) Also provide x86 SIMD code for the DC-only inverse transform. Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>pull/3/head
Christophe GISQUET
13 years ago
committed by
Kostya Shishkov
parent
b2ce3b998b
commit
3faa303a47
7 changed files with 200 additions and 66 deletions
@ -0,0 +1,55 @@ |
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;****************************************************************************** |
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;* MMX/SSE2-optimized functions for the RV30 and RV40 decoders |
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;* Copyright (C) 2012 Christophe Gisquet <christophe.gisquet@gmail.com> |
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;* |
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;* This file is part of Libav. |
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;* |
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;* Libav 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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;* Libav 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 Libav; 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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|
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%include "x86inc.asm" |
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%include "x86util.asm" |
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SECTION .text |
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%macro IDCT_DC_NOROUND 1 |
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imul %1, 13*13*3 |
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sar %1, 11 |
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%endmacro |
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%macro IDCT_DC_ROUND 1 |
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imul %1, 13*13 |
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add %1, 0x200 |
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sar %1, 10 |
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%endmacro |
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%macro rv34_idct_dequant4x4_dc 1 |
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cglobal rv34_idct_dequant4x4_%1_mmx2, 1, 2, 0 |
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movsx r1, word [r0] |
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IDCT_DC r1 |
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movd mm0, r1 |
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pshufw mm0, mm0, 0 |
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movq [r0+ 0], mm0 |
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movq [r0+16], mm0 |
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movq [r0+32], mm0 |
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movq [r0+48], mm0 |
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REP_RET |
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%endmacro |
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INIT_MMX |
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%define IDCT_DC IDCT_DC_ROUND |
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rv34_idct_dequant4x4_dc dc |
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%define IDCT_DC IDCT_DC_NOROUND |
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rv34_idct_dequant4x4_dc dc_noround |
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@ -0,0 +1,40 @@ |
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/*
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* RV30/40 MMX/SSE2 optimizations |
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* Copyright (C) 2012 Christophe Gisquet <christophe.gisquet@gmail.com> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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/cpu.h" |
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#include "libavutil/x86_cpu.h" |
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#include "libavcodec/dsputil.h" |
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#include "libavcodec/rv34dsp.h" |
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void ff_rv34_idct_dequant4x4_dc_mmx2(DCTELEM *block); |
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void ff_rv34_idct_dequant4x4_dc_noround_mmx2(DCTELEM *block); |
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av_cold void ff_rv34dsp_init_x86(RV34DSPContext* c, DSPContext *dsp) |
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{ |
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#if HAVE_YASM |
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int mm_flags = av_get_cpu_flags(); |
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if (mm_flags & AV_CPU_FLAG_MMX2) { |
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c->rv34_inv_transform_dc_tab[0] = ff_rv34_idct_dequant4x4_dc_mmx2; |
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c->rv34_inv_transform_dc_tab[1] = ff_rv34_idct_dequant4x4_dc_noround_mmx2; |
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} |
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#endif |
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} |
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