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4ad5b9c8db
The main loop processes 8 bytes in 5 instructions. For comparison, the optimal plain strnlen() requires 4 instructions per byte (6.4x worse): LBU; ADDI; BEQZ; BNE. The current libavcodec C code involves 5 instructions per byte (8x worse). Actual benchmarks may be slightly less favourable due to latency from ORC.B to BNE.
138 lines
7.0 KiB
C
138 lines
7.0 KiB
C
/*
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* Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
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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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/**
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* @file
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* H.264 DSP functions.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef AVCODEC_H264DSP_H
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#define AVCODEC_H264DSP_H
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#include <stdint.h>
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#include <stddef.h>
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typedef void (*h264_weight_func)(uint8_t *block, ptrdiff_t stride, int height,
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int log2_denom, int weight, int offset);
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typedef void (*h264_biweight_func)(uint8_t *dst, uint8_t *src,
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ptrdiff_t stride, int height, int log2_denom,
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int weightd, int weights, int offset);
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/**
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* Context for storing H.264 DSP functions
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*/
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typedef struct H264DSPContext {
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/* weighted MC */
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h264_weight_func weight_h264_pixels_tab[4];
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h264_biweight_func biweight_h264_pixels_tab[4];
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/* loop filter */
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void (*h264_v_loop_filter_luma)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
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int alpha, int beta, int8_t *tc0);
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void (*h264_h_loop_filter_luma)(uint8_t *pix /*align 4 */, ptrdiff_t stride,
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int alpha, int beta, int8_t *tc0);
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void (*h264_h_loop_filter_luma_mbaff)(uint8_t *pix /*align 16*/, ptrdiff_t stride,
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int alpha, int beta, int8_t *tc0);
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/* v/h_loop_filter_luma_intra: align 16 */
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void (*h264_v_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
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int alpha, int beta);
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void (*h264_h_loop_filter_luma_intra)(uint8_t *pix, ptrdiff_t stride,
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int alpha, int beta);
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void (*h264_h_loop_filter_luma_mbaff_intra)(uint8_t *pix /*align 16*/,
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ptrdiff_t stride, int alpha, int beta);
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void (*h264_v_loop_filter_chroma)(uint8_t *pix /*align 8*/, ptrdiff_t stride,
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int alpha, int beta, int8_t *tc0);
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void (*h264_h_loop_filter_chroma)(uint8_t *pix /*align 4*/, ptrdiff_t stride,
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int alpha, int beta, int8_t *tc0);
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void (*h264_h_loop_filter_chroma_mbaff)(uint8_t *pix /*align 8*/,
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ptrdiff_t stride, int alpha, int beta,
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int8_t *tc0);
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void (*h264_v_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
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ptrdiff_t stride, int alpha, int beta);
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void (*h264_h_loop_filter_chroma_intra)(uint8_t *pix /*align 8*/,
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ptrdiff_t stride, int alpha, int beta);
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void (*h264_h_loop_filter_chroma_mbaff_intra)(uint8_t *pix /*align 8*/,
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ptrdiff_t stride, int alpha, int beta);
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// h264_loop_filter_strength: simd only. the C version is inlined in h264_loopfilter.c
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void (*h264_loop_filter_strength)(int16_t bS[2][4][4], uint8_t nnz[40],
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int8_t ref[2][40], int16_t mv[2][40][2],
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int bidir, int edges, int step,
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int mask_mv0, int mask_mv1, int field);
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/* IDCT */
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void (*h264_idct_add)(uint8_t *dst /*align 4*/,
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int16_t *block /*align 16*/, int stride);
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void (*h264_idct8_add)(uint8_t *dst /*align 8*/,
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int16_t *block /*align 16*/, int stride);
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void (*h264_idct_dc_add)(uint8_t *dst /*align 4*/,
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int16_t *block /*align 16*/, int stride);
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void (*h264_idct8_dc_add)(uint8_t *dst /*align 8*/,
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int16_t *block /*align 16*/, int stride);
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void (*h264_idct_add16)(uint8_t *dst /*align 16*/, const int *blockoffset,
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int16_t *block /*align 16*/, int stride,
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const uint8_t nnzc[5 * 8]);
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void (*h264_idct8_add4)(uint8_t *dst /*align 16*/, const int *blockoffset,
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int16_t *block /*align 16*/, int stride,
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const uint8_t nnzc[5 * 8]);
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void (*h264_idct_add8)(uint8_t **dst /*align 16*/, const int *blockoffset,
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int16_t *block /*align 16*/, int stride,
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const uint8_t nnzc[15 * 8]);
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void (*h264_idct_add16intra)(uint8_t *dst /*align 16*/, const int *blockoffset,
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int16_t *block /*align 16*/,
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int stride, const uint8_t nnzc[5 * 8]);
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void (*h264_luma_dc_dequant_idct)(int16_t *output,
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int16_t *input /*align 16*/, int qmul);
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void (*h264_chroma_dc_dequant_idct)(int16_t *block, int qmul);
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/* bypass-transform */
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void (*h264_add_pixels8_clear)(uint8_t *dst, int16_t *block, int stride);
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void (*h264_add_pixels4_clear)(uint8_t *dst, int16_t *block, int stride);
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/**
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* Search buf from the start for up to size bytes. Return the index
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* of a zero byte, or >= size if not found. Ideally, use lookahead
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* to filter out any zero bytes that are known to not be followed by
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* one or more further zero bytes and a one byte. Better still, filter
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* out any bytes that form the trailing_zero_8bits syntax element too.
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*/
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int (*startcode_find_candidate)(const uint8_t *buf, int size);
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} H264DSPContext;
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void ff_h264dsp_init(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_aarch64(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_arm(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_ppc(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_riscv(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_x86(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_mips(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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void ff_h264dsp_init_loongarch(H264DSPContext *c, const int bit_depth,
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const int chroma_format_idc);
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#endif /* AVCODEC_H264DSP_H */
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