| /* |
| * SIMD-optimized IDCT functions for HEVC decoding |
| * Copyright (c) Alexandra Hajkova |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "config.h" |
| |
| #include "libavutil/attributes.h" |
| #include "libavutil/cpu.h" |
| #include "libavutil/ppc/cpu.h" |
| #include "libavutil/ppc/util_altivec.h" |
| |
| #include "libavcodec/hevcdsp.h" |
| |
| #if HAVE_ALTIVEC |
| static const vec_s16 trans4[4] = { |
| { 64, 64, 64, 64, 64, 64, 64, 64 }, |
| { 83, 36, 83, 36, 83, 36, 83, 36 }, |
| { 64, -64, 64, -64, 64, -64, 64, -64 }, |
| { 36, -83, 36, -83, 36, -83, 36, -83 }, |
| }; |
| |
| static const vec_u8 mask[2] = { |
| { 0x00, 0x01, 0x08, 0x09, 0x10, 0x11, 0x18, 0x19, 0x02, 0x03, 0x0A, 0x0B, 0x12, 0x13, 0x1A, 0x1B }, |
| { 0x04, 0x05, 0x0C, 0x0D, 0x14, 0x15, 0x1C, 0x1D, 0x06, 0x07, 0x0E, 0x0F, 0x16, 0x17, 0x1E, 0x1F }, |
| }; |
| |
| static void transform4x4(vec_s16 src_01, vec_s16 src_23, vec_s32 res[4], |
| const int shift, int16_t *coeffs) |
| { |
| vec_s16 src_02, src_13; |
| vec_s32 zero = vec_splat_s32(0); |
| vec_s32 e0, o0, e1, o1; |
| vec_s32 add; |
| |
| src_13 = vec_mergel(src_01, src_23); |
| src_02 = vec_mergeh(src_01, src_23); |
| |
| e0 = vec_msums(src_02, trans4[0], zero); |
| o0 = vec_msums(src_13, trans4[1], zero); |
| e1 = vec_msums(src_02, trans4[2], zero); |
| o1 = vec_msums(src_13, trans4[3], zero); |
| |
| switch(shift) { |
| case 7: add = vec_sl(vec_splat_s32(1), vec_splat_u32( 7 - 1)); break; |
| case 10: add = vec_sl(vec_splat_s32(1), vec_splat_u32(10 - 1)); break; |
| case 12: add = vec_sl(vec_splat_s32(1), vec_splat_u32(12 - 1)); break; |
| default: abort(); |
| } |
| |
| e0 = vec_add(e0, add); |
| e1 = vec_add(e1, add); |
| |
| res[0] = vec_add(e0, o0); |
| res[1] = vec_add(e1, o1); |
| res[2] = vec_sub(e1, o1); |
| res[3] = vec_sub(e0, o0); |
| } |
| |
| static void scale(vec_s32 res[4], vec_s16 res_packed[2], int shift) |
| { |
| int i; |
| vec_u32 v_shift; |
| |
| switch(shift) { |
| case 7: v_shift = vec_splat_u32(7) ; break; |
| case 10: v_shift = vec_splat_u32(10); break; |
| case 12: v_shift = vec_splat_u32(12); break; |
| default: abort(); |
| } |
| |
| for (i = 0; i < 4; i++) |
| res[i] = vec_sra(res[i], v_shift); |
| |
| // clip16 |
| res_packed[0] = vec_packs(res[0], res[1]); |
| res_packed[1] = vec_packs(res[2], res[3]); |
| } |
| |
| #define FUNCDECL(a, depth) a ## _ ## depth ## _altivec |
| #define FUNC(a, b) FUNCDECL(a, b) |
| |
| #define BIT_DEPTH 8 |
| #include "hevcdsp_template.c" |
| #undef BIT_DEPTH |
| |
| #define BIT_DEPTH 10 |
| #include "hevcdsp_template.c" |
| #undef BIT_DEPTH |
| #endif /* HAVE_ALTIVEC */ |
| |
| av_cold void ff_hevc_dsp_init_ppc(HEVCDSPContext *c, const int bit_depth) |
| { |
| #if HAVE_ALTIVEC |
| if (!PPC_ALTIVEC(av_get_cpu_flags())) |
| return; |
| |
| if (bit_depth == 8) |
| c->idct[0] = ff_hevc_idct_4x4_8_altivec; |
| if (bit_depth == 10) |
| c->idct[0] = ff_hevc_idct_4x4_10_altivec; |
| #endif /* HAVE_ALTIVEC */ |
| } |