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- /*
- * 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
- */
- #ifndef AVCODEC_ARM_CABAC_H
- #define AVCODEC_ARM_CABAC_H
- #include "config.h"
- #if HAVE_ARMV6T2_INLINE
- #include "libavutil/attributes.h"
- #include "libavutil/internal.h"
- #include "libavcodec/cabac.h"
- #define get_cabac_inline get_cabac_inline_arm
- static av_always_inline int get_cabac_inline_arm(CABACContext *c,
- uint8_t *const state)
- {
- int bit;
- void *reg_b, *reg_c, *tmp;
- __asm__ volatile(
- "ldrb %[bit] , [%[state]] \n\t"
- "add %[r_b] , %[tables] , %[lps_off] \n\t"
- "mov %[tmp] , %[range] \n\t"
- "and %[range] , %[range] , #0xC0 \n\t"
- "add %[r_b] , %[r_b] , %[bit] \n\t"
- "ldrb %[range] , [%[r_b], %[range], lsl #1] \n\t"
- "add %[r_b] , %[tables] , %[norm_off] \n\t"
- "sub %[r_c] , %[tmp] , %[range] \n\t"
- "lsl %[tmp] , %[r_c] , #17 \n\t"
- "cmp %[tmp] , %[low] \n\t"
- "it gt \n\t"
- "movgt %[range] , %[r_c] \n\t"
- "itt cc \n\t"
- "mvncc %[bit] , %[bit] \n\t"
- "subcc %[low] , %[low] , %[tmp] \n\t"
- "add %[r_c] , %[tables] , %[mlps_off] \n\t"
- "ldrb %[tmp] , [%[r_b], %[range]] \n\t"
- "ldrb %[r_b] , [%[r_c], %[bit]] \n\t"
- "lsl %[low] , %[low] , %[tmp] \n\t"
- "lsl %[range] , %[range] , %[tmp] \n\t"
- "uxth %[r_c] , %[low] \n\t"
- "strb %[r_b] , [%[state]] \n\t"
- "tst %[r_c] , %[r_c] \n\t"
- "bne 2f \n\t"
- "ldr %[r_c] , [%[c], %[byte]] \n\t"
- #if UNCHECKED_BITSTREAM_READER
- "ldrh %[tmp] , [%[r_c]] \n\t"
- "add %[r_c] , %[r_c] , #2 \n\t"
- "str %[r_c] , [%[c], %[byte]] \n\t"
- #else
- "ldr %[r_b] , [%[c], %[end]] \n\t"
- "ldrh %[tmp] , [%[r_c]] \n\t"
- "cmp %[r_c] , %[r_b] \n\t"
- "itt lt \n\t"
- "addlt %[r_c] , %[r_c] , #2 \n\t"
- "strlt %[r_c] , [%[c], %[byte]] \n\t"
- #endif
- "sub %[r_c] , %[low] , #1 \n\t"
- "add %[r_b] , %[tables] , %[norm_off] \n\t"
- "eor %[r_c] , %[low] , %[r_c] \n\t"
- "rev %[tmp] , %[tmp] \n\t"
- "lsr %[r_c] , %[r_c] , #15 \n\t"
- "lsr %[tmp] , %[tmp] , #15 \n\t"
- "ldrb %[r_c] , [%[r_b], %[r_c]] \n\t"
- "movw %[r_b] , #0xFFFF \n\t"
- "sub %[tmp] , %[tmp] , %[r_b] \n\t"
- "rsb %[r_c] , %[r_c] , #7 \n\t"
- "lsl %[tmp] , %[tmp] , %[r_c] \n\t"
- "add %[low] , %[low] , %[tmp] \n\t"
- "2: \n\t"
- : [bit]"=&r"(bit),
- [low]"+&r"(c->low),
- [range]"+&r"(c->range),
- [r_b]"=&r"(reg_b),
- [r_c]"=&r"(reg_c),
- [tmp]"=&r"(tmp)
- : [c]"r"(c),
- [state]"r"(state),
- [tables]"r"(ff_h264_cabac_tables),
- [byte]"M"(offsetof(CABACContext, bytestream)),
- [end]"M"(offsetof(CABACContext, bytestream_end)),
- [norm_off]"I"(H264_NORM_SHIFT_OFFSET),
- [lps_off]"I"(H264_LPS_RANGE_OFFSET),
- [mlps_off]"I"(H264_MLPS_STATE_OFFSET + 128)
- : "memory", "cc"
- );
- return bit & 1;
- }
- #endif /* HAVE_ARMV6T2_INLINE */
- #endif /* AVCODEC_ARM_CABAC_H */
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