mirror of https://github.com/FFmpeg/FFmpeg.git
Decoding 1080P H264 from 168fps to 170fps. Signed-off-by: Shiyou Yin <yinshiyou-hf@loongson.cn> Reviewed-by: 陈昊 <chenhao@loongson.cn> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>pull/375/head
Hao Chen
3 years ago
committed by
Michael Niedermayer
parent
afcb36b7e5
commit
024e934480
2 changed files with 142 additions and 0 deletions
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/*
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* Loongson optimized cabac |
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* |
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* Copyright (c) 2021 Loongson Technology Corporation Limited |
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* Contributed by Hao Chen <chenhao@loongson.cn> |
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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 "libavcodec/cabac.h" |
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#include "cabac.h" |
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#define decode_significance decode_significance_loongarch |
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static int decode_significance_loongarch(CABACContext *c, int max_coeff, |
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uint8_t *significant_coeff_ctx_base, int *index, int64_t last_off) |
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{ |
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void *end = significant_coeff_ctx_base + max_coeff - 1; |
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int64_t minusstart = -(int64_t)significant_coeff_ctx_base; |
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int64_t minusindex = 4 - (int64_t)index; |
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int64_t bit, tmp0, tmp1, tmp2, one = 1; |
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uint8_t *state = significant_coeff_ctx_base; |
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__asm__ volatile( |
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"3:" |
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#if UNCHECKED_BITSTREAM_READER |
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GET_CABAC_LOONGARCH_UNCBSR |
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#else |
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GET_CABAC_LOONGARCH |
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#endif |
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"blt %[bit], %[one], 4f \n\t" |
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"add.d %[state], %[state], %[last_off] \n\t" |
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#if UNCHECKED_BITSTREAM_READER |
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GET_CABAC_LOONGARCH_UNCBSR |
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#else |
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GET_CABAC_LOONGARCH |
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#endif |
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"sub.d %[state], %[state], %[last_off] \n\t" |
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"add.d %[tmp0], %[state], %[minusstart] \n\t" |
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"st.w %[tmp0], %[index], 0 \n\t" |
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"bge %[bit], %[one], 5f \n\t" |
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"addi.d %[index], %[index], 4 \n\t" |
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"4: \n\t" |
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"addi.d %[state], %[state], 1 \n\t" |
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"blt %[state], %[end], 3b \n\t" |
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"add.d %[tmp0], %[state], %[minusstart] \n\t" |
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"st.w %[tmp0], %[index], 0 \n\t" |
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"5: \n\t" |
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"add.d %[tmp0], %[index], %[minusindex] \n\t" |
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"srli.d %[tmp0], %[tmp0], 2 \n\t" |
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: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2), |
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[c_range]"+&r"(c->range), [c_low]"+&r"(c->low), [state]"+&r"(state), |
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[c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index) |
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: [tables]"r"(ff_h264_cabac_tables), [end]"r"(end), [one]"r"(one), |
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[minusstart]"r"(minusstart), [minusindex]"r"(minusindex), |
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[last_off]"r"(last_off), |
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#if !UNCHECKED_BITSTREAM_READER |
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[c_bytestream_end]"r"(c->bytestream_end), |
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#endif |
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[lps_off]"i"(H264_LPS_RANGE_OFFSET), |
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[mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128), |
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[norm_off]"i"(H264_NORM_SHIFT_OFFSET), |
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[cabac_mask]"r"(CABAC_MASK) |
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: "memory" |
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); |
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return (int)tmp0; |
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} |
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#define decode_significance_8x8 decode_significance_8x8_loongarch |
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static int decode_significance_8x8_loongarch( |
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CABACContext *c, uint8_t *significant_coeff_ctx_base, |
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int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off) |
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{ |
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int64_t minusindex = 4 - (int64_t)index; |
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int64_t bit, tmp0, tmp1, tmp2, one = 1, end = 63, last = 0; |
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uint8_t *state = 0; |
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int64_t flag_offset = H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET; |
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__asm__ volatile( |
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"3: \n\t" |
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"ldx.bu %[tmp0], %[sig_off], %[last] \n\t" |
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"add.d %[state], %[tmp0], %[significant_coeff_ctx_base] \n\t" |
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#if UNCHECKED_BITSTREAM_READER |
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GET_CABAC_LOONGARCH_UNCBSR |
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#else |
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GET_CABAC_LOONGARCH |
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#endif |
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"blt %[bit], %[one], 4f \n\t" |
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"add.d %[tmp0], %[tables], %[flag_offset] \n\t" |
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"ldx.bu %[tmp1], %[tmp0], %[last] \n\t" |
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"add.d %[state], %[tmp1], %[last_coeff_ctx_base] \n\t" |
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#if UNCHECKED_BITSTREAM_READER |
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GET_CABAC_LOONGARCH_UNCBSR |
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#else |
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GET_CABAC_LOONGARCH |
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#endif |
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"st.w %[last], %[index], 0 \n\t" |
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"bge %[bit], %[one], 5f \n\t" |
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"addi.d %[index], %[index], 4 \n\t" |
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"4: \n\t" |
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"addi.d %[last], %[last], 1 \n\t" |
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"blt %[last], %[end], 3b \n\t" |
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"st.w %[last], %[index], 0 \n\t" |
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"5: \n\t" |
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"add.d %[tmp0], %[index], %[minusindex] \n\t" |
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"srli.d %[tmp0], %[tmp0], 2 \n\t" |
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: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), |
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[tmp2]"=&r"(tmp2), [c_range]"+&r"(c->range), |
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[c_low]"+&r"(c->low), [state]"+&r"(state), [last]"+&r"(last), |
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[c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index) |
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: [tables]"r"(ff_h264_cabac_tables), [end]"r"(end), |
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[one]"r"(one), [minusindex]"r"(minusindex), |
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[last_coeff_ctx_base]"r"(last_coeff_ctx_base), |
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[flag_offset]"r"(flag_offset), |
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#if !UNCHECKED_BITSTREAM_READER |
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[c_bytestream_end]"r"(c->bytestream_end), |
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#endif |
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[lps_off]"i"(H264_LPS_RANGE_OFFSET), [sig_off]"r"(sig_off), |
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[mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128), |
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[norm_off]"i"(H264_NORM_SHIFT_OFFSET), |
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[cabac_mask]"r"(CABAC_MASK), |
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[significant_coeff_ctx_base]"r"(significant_coeff_ctx_base) |
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); |
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return (int)tmp0; |
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} |
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