mirror of https://git.ffmpeg.org/ffmpeg.git
141 lines
6.0 KiB
C
141 lines
6.0 KiB
C
/*
|
|
* Loongson optimized cabac
|
|
*
|
|
* Copyright (c) 2021 Loongson Technology Corporation Limited
|
|
* Contributed by Hao Chen <chenhao@loongson.cn>
|
|
*
|
|
* 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;
|
|
}
|