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Diffstat (limited to 'libavcodec/arm/vpx_arith.h')
| -rw-r--r-- | libavcodec/arm/vpx_arith.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/libavcodec/arm/vpx_arith.h b/libavcodec/arm/vpx_arith.h new file mode 100644 index 0000000000..1ead2284c3 --- /dev/null +++ b/libavcodec/arm/vpx_arith.h @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2010 Mans Rullgard <mans@mansr.com> + * + * 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_VPX_ARITH_H +#define AVCODEC_ARM_VPX_ARITH_H + +#if CONFIG_THUMB +# define A(x) +# define T(x) x +#else +# define A(x) x +# define T(x) +#endif + +#if CONFIG_THUMB || defined __clang__ +# define L(x) +# define U(x) x +#else +# define L(x) x +# define U(x) +#endif + +#if HAVE_ARMV6_INLINE + +#define vpx_rac_get_prob vp56_rac_get_prob_armv6 +static inline int vp56_rac_get_prob_armv6(VPXRangeCoder *c, int pr) +{ + unsigned shift = ff_vpx_norm_shift[c->high]; + unsigned code_word = c->code_word << shift; + unsigned high = c->high << shift; + unsigned bit; + + __asm__ ("adds %3, %3, %0 \n" + "itt cs \n" + "cmpcs %7, %4 \n" + L("ldrcsh %2, [%4], #2 \n") + U("ldrhcs %2, [%4], #2 \n") + "rsb %0, %6, #256 \n" + "smlabb %0, %5, %6, %0 \n" + T("itttt cs \n") + "rev16cs %2, %2 \n" + T("lslcs %2, %2, %3 \n") + T("orrcs %1, %1, %2 \n") + A("orrcs %1, %1, %2, lsl %3 \n") + "subcs %3, %3, #16 \n" + "lsr %0, %0, #8 \n" + "cmp %1, %0, lsl #16 \n" + "ittte ge \n" + "subge %1, %1, %0, lsl #16 \n" + "subge %0, %5, %0 \n" + "movge %2, #1 \n" + "movlt %2, #0 \n" + : "=&r"(c->high), "=&r"(c->code_word), "=&r"(bit), + "+&r"(c->bits), "+&r"(c->buffer) + : "r"(high), "r"(pr), "r"(c->end - 1), + "0"(shift), "1"(code_word) + : "cc"); + + return bit; +} + +#define vpx_rac_get_prob_branchy vp56_rac_get_prob_branchy_armv6 +static inline int vp56_rac_get_prob_branchy_armv6(VPXRangeCoder *c, int pr) +{ + unsigned shift = ff_vpx_norm_shift[c->high]; + unsigned code_word = c->code_word << shift; + unsigned high = c->high << shift; + unsigned low; + unsigned tmp; + + __asm__ ("adds %3, %3, %0 \n" + "itt cs \n" + "cmpcs %7, %4 \n" + L("ldrcsh %2, [%4], #2 \n") + U("ldrhcs %2, [%4], #2 \n") + "rsb %0, %6, #256 \n" + "smlabb %0, %5, %6, %0 \n" + T("itttt cs \n") + "rev16cs %2, %2 \n" + T("lslcs %2, %2, %3 \n") + T("orrcs %1, %1, %2 \n") + A("orrcs %1, %1, %2, lsl %3 \n") + "subcs %3, %3, #16 \n" + "lsr %0, %0, #8 \n" + "lsl %2, %0, #16 \n" + : "=&r"(low), "+&r"(code_word), "=&r"(tmp), + "+&r"(c->bits), "+&r"(c->buffer) + : "r"(high), "r"(pr), "r"(c->end - 1), "0"(shift) + : "cc"); + + if (code_word >= tmp) { + c->high = high - low; + c->code_word = code_word - tmp; + return 1; + } + + c->high = low; + c->code_word = code_word; + return 0; +} + +#endif + +#endif /* AVCODEC_ARM_VPX_ARITH_H */ |