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cfa3ceac7a
Add NEON-optimized implementations for HEVC angular intra prediction
modes 10 (pure horizontal) and 26 (pure vertical) at 8-bit depth.
Mode 10 (Horizontal):
- Broadcasts left[y] to fill each row using ld2r/ld4r for efficiency
- Applies edge smoothing for luma blocks smaller than 32x32
Mode 26 (Vertical):
- Copies top reference row to all output rows
- Applies edge smoothing for luma blocks smaller than 32x32
Edge smoothing uses uhsub+usqadd to compute the filtered result
directly in 8-bit, avoiding widening to 16-bit intermediates.
The C pred_angular wrappers are made non-static with ff_ prefix to
allow the NEON dispatch to fall back to C for modes not yet optimized.
This will be reverted once all angular modes are implemented.
Note: since pred_angular[] is a per-size function pointer (not
per-mode), checkasm benchmarks will show '_neon' for all 33 modes
even though only modes 10/26 are truly accelerated; unoptimized
modes show ~1.0x speedup as they pass through the NEON wrapper to
the C fallback with negligible overhead.
Speedup over C on Apple M4 (checkasm --bench, 15-run average):
Mode 10 (Horizontal):
4x4: 4.66x 8x8: 5.80x 16x16: 16.86x 32x32: 24.89x
Mode 26 (Vertical):
4x4: 1.16x 8x8: 1.83x 16x16: 2.45x 32x32: 4.50x
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
77 lines
3.3 KiB
C
77 lines
3.3 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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/* 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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