File size: 6,184 Bytes
8ead80b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 |
/*
* Loongson optimized cabac
*
* Copyright (c) 2021 Loongson Technology Corporation Limited
* Contributed by Hao Chen <[email protected]>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/cabac.h"
#include "cabac.h"
#define decode_significance decode_significance_loongarch
static int decode_significance_loongarch(CABACContext *c, int max_coeff,
uint8_t *significant_coeff_ctx_base, int *index, int64_t last_off)
{
void *end = significant_coeff_ctx_base + max_coeff - 1;
int64_t minusstart = -(int64_t)significant_coeff_ctx_base;
int64_t minusindex = 4 - (int64_t)index;
int64_t bit, tmp0, tmp1, tmp2, one = 1;
uint8_t *state = significant_coeff_ctx_base;
__asm__ volatile(
"3:"
#if UNCHECKED_BITSTREAM_READER
GET_CABAC_LOONGARCH_UNCBSR
#else
GET_CABAC_LOONGARCH
#endif
"blt %[bit], %[one], 4f \n\t"
"add.d %[state], %[state], %[last_off] \n\t"
#if UNCHECKED_BITSTREAM_READER
GET_CABAC_LOONGARCH_UNCBSR
#else
GET_CABAC_LOONGARCH
#endif
"sub.d %[state], %[state], %[last_off] \n\t"
"add.d %[tmp0], %[state], %[minusstart] \n\t"
"st.w %[tmp0], %[index], 0 \n\t"
"bge %[bit], %[one], 5f \n\t"
"addi.d %[index], %[index], 4 \n\t"
"4: \n\t"
"addi.d %[state], %[state], 1 \n\t"
"blt %[state], %[end], 3b \n\t"
"add.d %[tmp0], %[state], %[minusstart] \n\t"
"st.w %[tmp0], %[index], 0 \n\t"
"5: \n\t"
"add.d %[tmp0], %[index], %[minusindex] \n\t"
"srli.d %[tmp0], %[tmp0], 2 \n\t"
: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1), [tmp2]"=&r"(tmp2),
[c_range]"+&r"(c->range), [c_low]"+&r"(c->low), [state]"+&r"(state),
[c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index)
: [tables]"r"(ff_h264_cabac_tables), [end]"r"(end), [one]"r"(one),
[minusstart]"r"(minusstart), [minusindex]"r"(minusindex),
[last_off]"r"(last_off),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[lps_off]"i"(H264_LPS_RANGE_OFFSET),
[mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128),
[norm_off]"i"(H264_NORM_SHIFT_OFFSET),
[cabac_mask]"r"(CABAC_MASK)
: "memory"
);
return (int)tmp0;
}
#define decode_significance_8x8 decode_significance_8x8_loongarch
static int decode_significance_8x8_loongarch(
CABACContext *c, uint8_t *significant_coeff_ctx_base,
int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off)
{
int64_t minusindex = 4 - (int64_t)index;
int64_t bit, tmp0, tmp1, tmp2, one = 1, end = 63, last = 0;
uint8_t *state = 0;
int64_t flag_offset = H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET;
__asm__ volatile(
"3: \n\t"
"ldx.bu %[tmp0], %[sig_off], %[last] \n\t"
"add.d %[state], %[tmp0], %[significant_coeff_ctx_base] \n\t"
#if UNCHECKED_BITSTREAM_READER
GET_CABAC_LOONGARCH_UNCBSR
#else
GET_CABAC_LOONGARCH
#endif
"blt %[bit], %[one], 4f \n\t"
"add.d %[tmp0], %[tables], %[flag_offset] \n\t"
"ldx.bu %[tmp1], %[tmp0], %[last] \n\t"
"add.d %[state], %[tmp1], %[last_coeff_ctx_base] \n\t"
#if UNCHECKED_BITSTREAM_READER
GET_CABAC_LOONGARCH_UNCBSR
#else
GET_CABAC_LOONGARCH
#endif
"st.w %[last], %[index], 0 \n\t"
"bge %[bit], %[one], 5f \n\t"
"addi.d %[index], %[index], 4 \n\t"
"4: \n\t"
"addi.d %[last], %[last], 1 \n\t"
"blt %[last], %[end], 3b \n\t"
"st.w %[last], %[index], 0 \n\t"
"5: \n\t"
"add.d %[tmp0], %[index], %[minusindex] \n\t"
"srli.d %[tmp0], %[tmp0], 2 \n\t"
: [bit]"=&r"(bit), [tmp0]"=&r"(tmp0), [tmp1]"=&r"(tmp1),
[tmp2]"=&r"(tmp2), [c_range]"+&r"(c->range),
[c_low]"+&r"(c->low), [state]"+&r"(state), [last]"+&r"(last),
[c_bytestream]"+&r"(c->bytestream), [index]"+&r"(index)
: [tables]"r"(ff_h264_cabac_tables), [end]"r"(end),
[one]"r"(one), [minusindex]"r"(minusindex),
[last_coeff_ctx_base]"r"(last_coeff_ctx_base),
[flag_offset]"r"(flag_offset),
#if !UNCHECKED_BITSTREAM_READER
[c_bytestream_end]"r"(c->bytestream_end),
#endif
[lps_off]"i"(H264_LPS_RANGE_OFFSET), [sig_off]"r"(sig_off),
[mlps_off]"i"(H264_MLPS_STATE_OFFSET + 128),
[norm_off]"i"(H264_NORM_SHIFT_OFFSET),
[cabac_mask]"r"(CABAC_MASK),
[significant_coeff_ctx_base]"r"(significant_coeff_ctx_base)
);
return (int)tmp0;
}
|