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105 lines
3.1 KiB
105 lines
3.1 KiB
/* 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 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 "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 void transform4x4(vec_s16 src_01, vec_s16 src_23, vec_s32 res[4], |
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const int shift, 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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add = vec_sl(vec_splat_s32(1), vec_splat_u32(shift - 1)); |
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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 void scale(vec_s32 res[4], vec_s16 res_packed[2], int shift) |
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{ |
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int i; |
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vec_u32 v_shift = vec_splat_u32(shift); |
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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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