[deb_ffmpeg.git] / ffmpeg / libavcodec / arm / cabac.h

/*
 * 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 */
Commit	Line	Data
2ba45a60 DM	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_ARM_CABAC_H
	20	#define AVCODEC_ARM_CABAC_H
	21
	22	#include "config.h"
	23	#if HAVE_ARMV6T2_INLINE
	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_arm
	30	static av_always_inline int get_cabac_inline_arm(CABACContext *c,
	31	uint8_t *const state)
	32	{
	33	int bit;
	34	void reg_b, reg_c, *tmp;
	35
	36	__asm__ volatile(
	37	"ldrb %[bit] , [%[state]] \n\t"
	38	"add %[r_b] , %[tables] , %[lps_off] \n\t"
	39	"mov %[tmp] , %[range] \n\t"
	40	"and %[range] , %[range] , #0xC0 \n\t"
	41	"add %[r_b] , %[r_b] , %[bit] \n\t"
	42	"ldrb %[range] , [%[r_b], %[range], lsl #1] \n\t"
	43	"add %[r_b] , %[tables] , %[norm_off] \n\t"
	44	"sub %[r_c] , %[tmp] , %[range] \n\t"
	45	"lsl %[tmp] , %[r_c] , #17 \n\t"
	46	"cmp %[tmp] , %[low] \n\t"
	47	"it gt \n\t"
	48	"movgt %[range] , %[r_c] \n\t"
	49	"itt cc \n\t"
	50	"mvncc %[bit] , %[bit] \n\t"
	51	"subcc %[low] , %[low] , %[tmp] \n\t"
	52	"add %[r_c] , %[tables] , %[mlps_off] \n\t"
	53	"ldrb %[tmp] , [%[r_b], %[range]] \n\t"
	54	"ldrb %[r_b] , [%[r_c], %[bit]] \n\t"
	55	"lsl %[low] , %[low] , %[tmp] \n\t"
	56	"lsl %[range] , %[range] , %[tmp] \n\t"
	57	"uxth %[r_c] , %[low] \n\t"
	58	"strb %[r_b] , [%[state]] \n\t"
	59	"tst %[r_c] , %[r_c] \n\t"
	60	"bne 2f \n\t"
	61	"ldr %[r_c] , [%[c], %[byte]] \n\t"
	62	#if UNCHECKED_BITSTREAM_READER
	63	"ldrh %[tmp] , [%[r_c]] \n\t"
	64	"add %[r_c] , %[r_c] , #2 \n\t"
65	"str %[r_c] , [%[c], %[byte]] \n\t"
66	#else
67	"ldr %[r_b] , [%[c], %[end]] \n\t"
68	"ldrh %[tmp] , [%[r_c]] \n\t"
69	"cmp %[r_c] , %[r_b] \n\t"
70	"itt lt \n\t"
71	"addlt %[r_c] , %[r_c] , #2 \n\t"
72	"strlt %[r_c] , [%[c], %[byte]] \n\t"
73	#endif
74	"sub %[r_c] , %[low] , #1 \n\t"
75	"add %[r_b] , %[tables] , %[norm_off] \n\t"
76	"eor %[r_c] , %[low] , %[r_c] \n\t"
77	"rev %[tmp] , %[tmp] \n\t"
78	"lsr %[r_c] , %[r_c] , #15 \n\t"
79	"lsr %[tmp] , %[tmp] , #15 \n\t"
80	"ldrb %[r_c] , [%[r_b], %[r_c]] \n\t"
81	"movw %[r_b] , #0xFFFF \n\t"
82	"sub %[tmp] , %[tmp] , %[r_b] \n\t"
83	"rsb %[r_c] , %[r_c] , #7 \n\t"
84	"lsl %[tmp] , %[tmp] , %[r_c] \n\t"
85	"add %[low] , %[low] , %[tmp] \n\t"
86	"2: \n\t"
87	: [bit]"=&r"(bit),
88	[low]"+&r"(c->low),
89	[range]"+&r"(c->range),
90	[r_b]"=&r"(reg_b),
91	[r_c]"=&r"(reg_c),
92	[tmp]"=&r"(tmp)
93	: [c]"r"(c),
94	[state]"r"(state),
95	[tables]"r"(ff_h264_cabac_tables),
96	[byte]"M"(offsetof(CABACContext, bytestream)),
97	[end]"M"(offsetof(CABACContext, bytestream_end)),
98	[norm_off]"I"(H264_NORM_SHIFT_OFFSET),
99	[lps_off]"I"(H264_LPS_RANGE_OFFSET),
100	[mlps_off]"I"(H264_MLPS_STATE_OFFSET + 128)
101	: "memory", "cc"
102	);
103
104	return bit & 1;
105	}
106	#endif /* HAVE_ARMV6T2_INLINE */
107
108	#endif /* AVCODEC_ARM_CABAC_H */