[FFmpeg-devel] [PATCH v2 3/3] avcodec: [loongarch] Optimize decode_significance/_8x8_loongarch.
陈昊
chenhao at loongson.cn
Wed Dec 1 09:16:28 EET 2021
LGTM
"yinshiyou-hf at loongson.cn" <yinshiyou-hf at loongson.cn>写道：
> From: Hao Chen <chenhao at loongson.cn>
>
> Decoding 1080P H264 from 168fps to 170fps.
>
> Signed-off-by: Shiyou Yin <yinshiyou-hf at loongson.cn>
> ---
> libavcodec/h264_cabac.c | 2 +
> libavcodec/loongarch/h264_cabac.c | 140 ++++++++++++++++++++++++++++++
> 2 files changed, 142 insertions(+)
> create mode 100644 libavcodec/loongarch/h264_cabac.c
>
> diff --git a/libavcodec/h264_cabac.c b/libavcodec/h264_cabac.c
> index 973b3419c4..040fa0a257 100644
> --- a/libavcodec/h264_cabac.c
> +++ b/libavcodec/h264_cabac.c
> @@ -42,6 +42,8 @@
>
> #if ARCH_X86
> #include "x86/h264_cabac.c"
> +#elif ARCH_LOONGARCH64
> +#include "loongarch/h264_cabac.c"
> #endif
>
> /* Cabac pre state table */
> diff --git a/libavcodec/loongarch/h264_cabac.c b/libavcodec/loongarch/h264_cabac.c
> new file mode 100644
> index 0000000000..d88743bed7
> --- /dev/null
> +++ b/libavcodec/loongarch/h264_cabac.c
> @@ -0,0 +1,140 @@
> +/*
> + * Loongson optimized cabac
> + *
> + * Copyright (c) 2021 Loongson Technology Corporation Limited
> + * Contributed by Hao Chen <chenhao at 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;
> +}
> --
> 2.20.1
>
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