Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * This file is part of FFmpeg. |
||
| 3 | * |
||
| 4 | * FFmpeg is free software; you can redistribute it and/or |
||
| 5 | * modify it under the terms of the GNU Lesser General Public |
||
| 6 | * License as published by the Free Software Foundation; either |
||
| 7 | * version 2.1 of the License, or (at your option) any later version. |
||
| 8 | * |
||
| 9 | * FFmpeg is distributed in the hope that it will be useful, |
||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
||
| 12 | * Lesser General Public License for more details. |
||
| 13 | * |
||
| 14 | * You should have received a copy of the GNU Lesser General Public |
||
| 15 | * License along with FFmpeg; if not, write to the Free Software |
||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||
| 17 | */ |
||
| 18 | |||
| 19 | #ifndef AVCODEC_AARCH64_CABAC_H |
||
| 20 | #define AVCODEC_AARCH64_CABAC_H |
||
| 21 | |||
| 22 | #include "config.h" |
||
| 23 | #if HAVE_INLINE_ASM |
||
| 24 | |||
| 25 | #include "libavutil/attributes.h" |
||
| 26 | #include "libavutil/internal.h" |
||
| 27 | #include "libavcodec/cabac.h" |
||
| 28 | |||
| 29 | #define get_cabac_inline get_cabac_inline_aarch64 |
||
| 30 | static av_always_inline int get_cabac_inline_aarch64(CABACContext *c, |
||
| 31 | uint8_t *const state) |
||
| 32 | { |
||
| 33 | int bit; |
||
| 34 | void *reg_a, *reg_b, *reg_c, *tmp; |
||
| 35 | |||
| 36 | __asm__ volatile( |
||
| 37 | "ldrb %w[bit] , [%[state]] \n\t" |
||
| 38 | "add %[r_b] , %[tables] , %[lps_off] \n\t" |
||
| 39 | "mov %w[tmp] , %w[range] \n\t" |
||
| 40 | "and %w[range] , %w[range] , #0xC0 \n\t" |
||
| 41 | "lsl %w[r_c] , %w[range] , #1 \n\t" |
||
| 42 | "add %[r_b] , %[r_b] , %w[bit], UXTW \n\t" |
||
| 43 | "ldrb %w[range] , [%[r_b], %w[r_c], SXTW] \n\t" |
||
| 44 | "sub %w[r_c] , %w[tmp] , %w[range] \n\t" |
||
| 45 | "lsl %w[tmp] , %w[r_c] , #17 \n\t" |
||
| 46 | "cmp %w[tmp] , %w[low] \n\t" |
||
| 47 | "csel %w[tmp] , %w[tmp] , wzr , cc \n\t" |
||
| 48 | "csel %w[range] , %w[r_c] , %w[range], gt \n\t" |
||
| 49 | "cinv %w[bit] , %w[bit] , cc \n\t" |
||
| 50 | "sub %w[low] , %w[low] , %w[tmp] \n\t" |
||
| 51 | "add %[r_b] , %[tables] , %[norm_off] \n\t" |
||
| 52 | "add %[r_a] , %[tables] , %[mlps_off] \n\t" |
||
| 53 | "ldrb %w[tmp] , [%[r_b], %w[range], SXTW] \n\t" |
||
| 54 | "ldrb %w[r_a] , [%[r_a], %w[bit], SXTW] \n\t" |
||
| 55 | "lsl %w[low] , %w[low] , %w[tmp] \n\t" |
||
| 56 | "lsl %w[range] , %w[range] , %w[tmp] \n\t" |
||
| 57 | "uxth %w[r_c] , %w[low] \n\t" |
||
| 58 | "strb %w[r_a] , [%[state]] \n\t" |
||
| 59 | "cbnz %w[r_c] , 2f \n\t" |
||
| 60 | "ldr %[r_c] , [%[c], %[byte]] \n\t" |
||
| 61 | "ldr %[r_a] , [%[c], %[end]] \n\t" |
||
| 62 | "ldrh %w[tmp] , [%[r_c]] \n\t" |
||
| 63 | "cmp %[r_c] , %[r_a] \n\t" |
||
| 64 | "b.ge 1f \n\t" |
||
| 65 | "add %[r_a] , %[r_c] , #2 \n\t" |
||
| 66 | "str %[r_a] , [%[c], %[byte]] \n\t" |
||
| 67 | "1: \n\t" |
||
| 68 | "sub %w[r_c] , %w[low] , #1 \n\t" |
||
| 69 | "eor %w[r_c] , %w[r_c] , %w[low] \n\t" |
||
| 70 | "rev %w[tmp] , %w[tmp] \n\t" |
||
| 71 | "lsr %w[r_c] , %w[r_c] , #15 \n\t" |
||
| 72 | "lsr %w[tmp] , %w[tmp] , #15 \n\t" |
||
| 73 | "ldrb %w[r_c] , [%[r_b], %w[r_c], SXTW] \n\t" |
||
| 74 | "mov %w[r_b] , #0xFFFF \n\t" |
||
| 75 | "mov %w[r_a] , #7 \n\t" |
||
| 76 | "sub %w[tmp] , %w[tmp] , %w[r_b] \n\t" |
||
| 77 | "sub %w[r_c] , %w[r_a] , %w[r_c] \n\t" |
||
| 78 | "lsl %w[tmp] , %w[tmp] , %w[r_c] \n\t" |
||
| 79 | "add %w[low] , %w[low] , %w[tmp] \n\t" |
||
| 80 | "2: \n\t" |
||
| 81 | : [bit]"=&r"(bit), |
||
| 82 | [low]"+&r"(c->low), |
||
| 83 | [range]"+&r"(c->range), |
||
| 84 | [r_a]"=&r"(reg_a), |
||
| 85 | [r_b]"=&r"(reg_b), |
||
| 86 | [r_c]"=&r"(reg_c), |
||
| 87 | [tmp]"=&r"(tmp) |
||
| 88 | : [c]"r"(c), |
||
| 89 | [state]"r"(state), |
||
| 90 | [tables]"r"(ff_h264_cabac_tables), |
||
| 91 | [byte]"i"(offsetof(CABACContext, bytestream)), |
||
| 92 | [end]"i"(offsetof(CABACContext, bytestream_end)), |
||
| 93 | [norm_off]"I"(H264_NORM_SHIFT_OFFSET), |
||
| 94 | [lps_off]"I"(H264_LPS_RANGE_OFFSET), |
||
| 95 | [mlps_off]"I"(H264_MLPS_STATE_OFFSET + 128) |
||
| 96 | : "memory", "cc" |
||
| 97 | ); |
||
| 98 | |||
| 99 | return bit & 1; |
||
| 100 | } |
||
| 101 | |||
| 102 | #endif /* HAVE_INLINE_ASM */ |
||
| 103 | |||
| 104 | #endif /* AVCODEC_AARCH64_CABAC_H */ |