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https://github.com/FFmpeg/FFmpeg.git
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2c64a6bcd2
The affected functions could also be changed into macros, this is the smaller change to fix it though. And avoids (probably) less readable macros The extra code should be optimized out when optimizations are done as all values are known at build after inlining. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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* SIMD-optimized IDCT functions for HEVC decoding
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* Copyright (c) Alexandra Hajkova
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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 "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "libavutil/ppc/cpu.h"
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#include "libavutil/ppc/util_altivec.h"
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#include "libavcodec/hevcdsp.h"
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#if HAVE_ALTIVEC
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static const vec_s16 trans4[4] = {
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{ 64, 64, 64, 64, 64, 64, 64, 64 },
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{ 83, 36, 83, 36, 83, 36, 83, 36 },
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{ 64, -64, 64, -64, 64, -64, 64, -64 },
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{ 36, -83, 36, -83, 36, -83, 36, -83 },
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};
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static const vec_u8 mask[2] = {
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{ 0x00, 0x01, 0x08, 0x09, 0x10, 0x11, 0x18, 0x19, 0x02, 0x03, 0x0A, 0x0B, 0x12, 0x13, 0x1A, 0x1B },
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{ 0x04, 0x05, 0x0C, 0x0D, 0x14, 0x15, 0x1C, 0x1D, 0x06, 0x07, 0x0E, 0x0F, 0x16, 0x17, 0x1E, 0x1F },
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};
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static av_always_inline void transform4x4(vec_s16 src_01, vec_s16 src_23,
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vec_s32 res[4], const int shift,
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int16_t *coeffs)
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{
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vec_s16 src_02, src_13;
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vec_s32 zero = vec_splat_s32(0);
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vec_s32 e0, o0, e1, o1;
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vec_s32 add;
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src_13 = vec_mergel(src_01, src_23);
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src_02 = vec_mergeh(src_01, src_23);
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e0 = vec_msums(src_02, trans4[0], zero);
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o0 = vec_msums(src_13, trans4[1], zero);
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e1 = vec_msums(src_02, trans4[2], zero);
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o1 = vec_msums(src_13, trans4[3], zero);
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switch(shift) {
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case 7: add = vec_sl(vec_splat_s32(1), vec_splat_u32( 7 - 1)); break;
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case 10: add = vec_sl(vec_splat_s32(1), vec_splat_u32(10 - 1)); break;
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case 12: add = vec_sl(vec_splat_s32(1), vec_splat_u32(12 - 1)); break;
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default: abort();
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}
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e0 = vec_add(e0, add);
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e1 = vec_add(e1, add);
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res[0] = vec_add(e0, o0);
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res[1] = vec_add(e1, o1);
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res[2] = vec_sub(e1, o1);
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res[3] = vec_sub(e0, o0);
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}
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static av_always_inline void scale(vec_s32 res[4], vec_s16 res_packed[2],
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const int shift)
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{
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int i;
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vec_u32 v_shift;
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switch(shift) {
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case 7: v_shift = vec_splat_u32(7) ; break;
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case 10: v_shift = vec_splat_u32(10); break;
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case 12: v_shift = vec_splat_u32(12); break;
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default: abort();
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}
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for (i = 0; i < 4; i++)
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res[i] = vec_sra(res[i], v_shift);
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// clip16
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res_packed[0] = vec_packs(res[0], res[1]);
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res_packed[1] = vec_packs(res[2], res[3]);
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}
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#define FUNCDECL(a, depth) a ## _ ## depth ## _altivec
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#define FUNC(a, b) FUNCDECL(a, b)
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#define BIT_DEPTH 8
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#include "hevcdsp_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 10
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#include "hevcdsp_template.c"
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#undef BIT_DEPTH
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_hevc_dsp_init_ppc(HEVCDSPContext *c, const int bit_depth)
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{
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#if HAVE_ALTIVEC
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if (!PPC_ALTIVEC(av_get_cpu_flags()))
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return;
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if (bit_depth == 8)
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c->idct[0] = ff_hevc_idct_4x4_8_altivec;
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if (bit_depth == 10)
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c->idct[0] = ff_hevc_idct_4x4_10_altivec;
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#endif /* HAVE_ALTIVEC */
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}
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