mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 05:17:42 +00:00
Marcos Ashton Iglesias
278eeeb16e
Implements planar intra prediction for 8 bit. x86 has no HEVC intra prediction at all; aarch64 NEON already covers planar, DC and angular. Every term except (size-1-x)*left[y] is linear in y, so for a group of eight columns they collapse into one running accumulator whose increment left[size]-top[x] is loop invariant. Running columns outermost keeps that accumulator and its delta in registers, so a row costs one pmullw and two paddw with no reload of top[]. 16x16 and 32x32 run two groups together, sharing the left[y] broadcast and writing a row with one 16 byte store. Words suffice throughout: each coefficient pair sums to size, so the largest value is 2*32*255 + 32 = 16352. SSSE3 rather than SSE2 since pshufb does the broadcasts and the byte to word widening. checkasm --bench on a Core Ultra 7 155H: hevc_pred_planar_4x4_8_c: 18.4 hevc_pred_planar_4x4_8_ssse3: 5.5 ( 3.35x) hevc_pred_planar_8x8_8_c: 83.1 hevc_pred_planar_8x8_8_ssse3: 16.3 ( 5.10x) hevc_pred_planar_16x16_8_c: 224.8 hevc_pred_planar_16x16_8_ssse3: 47.3 ( 4.75x) hevc_pred_planar_32x32_8_c: 629.5 hevc_pred_planar_32x32_8_ssse3: 196.5 ( 3.20x) Part of #23022.
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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* HEVC video Decoder
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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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 "hevcdec.h"
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#include "pred.h"
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#define BIT_DEPTH 8
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#include "libavcodec/hevc/pred_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 9
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#include "libavcodec/hevc/pred_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 10
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#include "libavcodec/hevc/pred_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 12
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#include "libavcodec/hevc/pred_template.c"
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#undef BIT_DEPTH
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void ff_hevc_pred_init(HEVCPredContext *hpc, int bit_depth)
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{
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#undef FUNC
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#define FUNC(a, depth) a ## _ ## depth
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#define HEVC_PRED(depth) \
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hpc->intra_pred[0] = FUNC(intra_pred_2, depth); \
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hpc->intra_pred[1] = FUNC(intra_pred_3, depth); \
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hpc->intra_pred[2] = FUNC(intra_pred_4, depth); \
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hpc->intra_pred[3] = FUNC(intra_pred_5, depth); \
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hpc->pred_planar[0] = FUNC(pred_planar_0, depth); \
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hpc->pred_planar[1] = FUNC(pred_planar_1, depth); \
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hpc->pred_planar[2] = FUNC(pred_planar_2, depth); \
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hpc->pred_planar[3] = FUNC(pred_planar_3, depth); \
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hpc->pred_dc = FUNC(pred_dc, depth); \
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hpc->pred_angular[0] = FUNC(ff_hevc_pred_angular_0, depth); \
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hpc->pred_angular[1] = FUNC(ff_hevc_pred_angular_1, depth); \
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hpc->pred_angular[2] = FUNC(ff_hevc_pred_angular_2, depth); \
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hpc->pred_angular[3] = FUNC(ff_hevc_pred_angular_3, depth); \
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hpc->ref_filter_3tap[0] = FUNC(ref_filter_3tap, depth); \
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hpc->ref_filter_3tap[1] = FUNC(ref_filter_3tap, depth); \
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hpc->ref_filter_3tap[2] = FUNC(ref_filter_3tap, depth); \
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hpc->ref_filter_strong = FUNC(ref_filter_strong, depth);
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switch (bit_depth) {
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case 9:
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HEVC_PRED(9);
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break;
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case 10:
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HEVC_PRED(10);
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break;
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case 12:
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HEVC_PRED(12);
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break;
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default:
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HEVC_PRED(8);
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break;
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}
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#if ARCH_AARCH64
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ff_hevc_pred_init_aarch64(hpc, bit_depth);
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#endif
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#if ARCH_MIPS
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ff_hevc_pred_init_mips(hpc, bit_depth);
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#endif
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#if ARCH_X86 && HAVE_X86ASM
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ff_hevc_pred_init_x86(hpc, bit_depth);
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#endif
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}
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