mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 13:28:17 +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.
79 lines
3.4 KiB
C
79 lines
3.4 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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#ifndef AVCODEC_HEVC_PRED_H
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#define AVCODEC_HEVC_PRED_H
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#include <stddef.h>
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#include <stdint.h>
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struct HEVCLocalContext;
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struct HEVCPPS;
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typedef struct HEVCPredContext {
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void (*intra_pred[4])(struct HEVCLocalContext *lc,
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const struct HEVCPPS *pps, int x0, int y0, int c_idx);
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void (*pred_planar[4])(uint8_t *src, const uint8_t *top,
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const uint8_t *left, ptrdiff_t stride);
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void (*pred_dc)(uint8_t *src, const uint8_t *top, const uint8_t *left,
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ptrdiff_t stride, int log2_size, int c_idx);
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void (*pred_angular[4])(uint8_t *src, const uint8_t *top,
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const uint8_t *left, ptrdiff_t stride,
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int c_idx, int mode);
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void (*ref_filter_3tap[3])(uint8_t *filtered_left, uint8_t *filtered_top,
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const uint8_t *left, const uint8_t *top,
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int size);
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void (*ref_filter_strong)(uint8_t *filtered_top, uint8_t *left,
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const uint8_t *top);
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} HEVCPredContext;
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void ff_hevc_pred_init(HEVCPredContext *hpc, int bit_depth);
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void ff_hevc_pred_init_mips(HEVCPredContext *hpc, int bit_depth);
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void ff_hevc_pred_init_aarch64(HEVCPredContext *hpc, int bit_depth);
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void ff_hevc_pred_init_x86(HEVCPredContext *hpc, int bit_depth);
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/* C angular prediction fallbacks (non-static for arch-specific partial override) */
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#define HEVC_PRED_ANGULAR_DECL(depth) \
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void ff_hevc_pred_angular_0_ ## depth(uint8_t *src, const uint8_t *top, \
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const uint8_t *left, ptrdiff_t stride, \
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int c_idx, int mode); \
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void ff_hevc_pred_angular_1_ ## depth(uint8_t *src, const uint8_t *top, \
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const uint8_t *left, ptrdiff_t stride, \
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int c_idx, int mode); \
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void ff_hevc_pred_angular_2_ ## depth(uint8_t *src, const uint8_t *top, \
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const uint8_t *left, ptrdiff_t stride, \
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int c_idx, int mode); \
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void ff_hevc_pred_angular_3_ ## depth(uint8_t *src, const uint8_t *top, \
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const uint8_t *left, ptrdiff_t stride, \
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int c_idx, int mode);
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HEVC_PRED_ANGULAR_DECL(8)
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HEVC_PRED_ANGULAR_DECL(9)
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HEVC_PRED_ANGULAR_DECL(10)
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HEVC_PRED_ANGULAR_DECL(12)
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#undef HEVC_PRED_ANGULAR_DECL
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#endif /* AVCODEC_HEVC_PRED_H */
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