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106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/* 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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