FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/vp56.h	Lines:	79	79	100.0 %
Date:	2021-04-15 16:04:23	Branches:	28	28	100.0 %


/*
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * 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
 */

/**
 * @file
 * VP5 and VP6 compatible video decoder (common features)
 */

#ifndef AVCODEC_VP56_H
#define AVCODEC_VP56_H

#include "libavutil/mem_internal.h"

#include "avcodec.h"
#include "get_bits.h"
#include "hpeldsp.h"
#include "bytestream.h"
#include "h264chroma.h"
#include "videodsp.h"
#include "vp3dsp.h"
#include "vp56dsp.h"

typedef struct vp56_context VP56Context;

typedef enum {
    VP56_FRAME_NONE     =-1,
    VP56_FRAME_CURRENT  = 0,
    VP56_FRAME_PREVIOUS = 1,
    VP56_FRAME_GOLDEN   = 2,
    VP56_FRAME_GOLDEN2  = 3,
} VP56Frame;

typedef enum {
    VP56_MB_INTER_NOVEC_PF = 0,  /**< Inter MB, no vector, from previous frame */
    VP56_MB_INTRA          = 1,  /**< Intra MB */
    VP56_MB_INTER_DELTA_PF = 2,  /**< Inter MB, above/left vector + delta, from previous frame */
    VP56_MB_INTER_V1_PF    = 3,  /**< Inter MB, first vector, from previous frame */
    VP56_MB_INTER_V2_PF    = 4,  /**< Inter MB, second vector, from previous frame */
    VP56_MB_INTER_NOVEC_GF = 5,  /**< Inter MB, no vector, from golden frame */
    VP56_MB_INTER_DELTA_GF = 6,  /**< Inter MB, above/left vector + delta, from golden frame */
    VP56_MB_INTER_4V       = 7,  /**< Inter MB, 4 vectors, from previous frame */
    VP56_MB_INTER_V1_GF    = 8,  /**< Inter MB, first vector, from golden frame */
    VP56_MB_INTER_V2_GF    = 9,  /**< Inter MB, second vector, from golden frame */
} VP56mb;

typedef struct VP56Tree {
  int8_t val;
  int8_t prob_idx;
} VP56Tree;

typedef struct VP56mv {
    DECLARE_ALIGNED(4, int16_t, x);
    int16_t y;
} VP56mv;

#define VP56_SIZE_CHANGE 1

typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
                                          VP56mv *vect);
typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
                           int offset1, int offset2, ptrdiff_t stride,
                           VP56mv mv, int mask, int select, int luma);
typedef int  (*VP56ParseCoeff)(VP56Context *s);
typedef void (*VP56DefaultModelsInit)(VP56Context *s);
typedef void (*VP56ParseVectorModels)(VP56Context *s);
typedef int  (*VP56ParseCoeffModels)(VP56Context *s);
typedef int  (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
                                int buf_size);

typedef struct VP56RangeCoder {
    int high;
    int bits; /* stored negated (i.e. negative "bits" is a positive number of
                 bits left) in order to eliminate a negate in cache refilling */
    const uint8_t *buffer;
    const uint8_t *end;
    unsigned int code_word;
    int end_reached;
} VP56RangeCoder;

typedef struct VP56RefDc {
    uint8_t not_null_dc;
    VP56Frame ref_frame;
    int16_t dc_coeff;
} VP56RefDc;

typedef struct VP56Macroblock {
    uint8_t type;
    VP56mv mv;
} VP56Macroblock;

typedef struct VP56Model {
    uint8_t coeff_reorder[64];       /* used in vp6 only */
    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
    uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
    uint8_t vector_sig[2];           /* delta sign */
    uint8_t vector_dct[2];           /* delta coding types */
    uint8_t vector_pdi[2][2];        /* predefined delta init */
    uint8_t vector_pdv[2][7];        /* predefined delta values */
    uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
    uint8_t coeff_dccv[2][11];       /* DC coeff value */
    uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
    uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
    uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
    uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
    uint8_t mb_type[3][10][10];      /* model for decoding MB type */
    uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
} VP56Model;

struct vp56_context {
    AVCodecContext *avctx;
    H264ChromaContext h264chroma;
    HpelDSPContext hdsp;
    VideoDSPContext vdsp;
    VP3DSPContext vp3dsp;
    VP56DSPContext vp56dsp;
    uint8_t idct_scantable[64];
    AVFrame *frames[4];
    uint8_t *edge_emu_buffer_alloc;
    uint8_t *edge_emu_buffer;
    VP56RangeCoder c;
    VP56RangeCoder cc;
    VP56RangeCoder *ccp;
    int sub_version;

    /* frame info */
    int golden_frame;
    int plane_width[4];
    int plane_height[4];
    int mb_width;   /* number of horizontal MB */
    int mb_height;  /* number of vertical MB */
    int block_offset[6];

    int quantizer;
    uint16_t dequant_dc;
    uint16_t dequant_ac;

    /* DC predictors management */
    VP56RefDc *above_blocks;
    VP56RefDc left_block[4];
    int above_block_idx[6];
    int16_t prev_dc[3][3];    /* [plan][ref_frame] */

    /* blocks / macroblock */
    VP56mb mb_type;
    VP56Macroblock *macroblocks;
    DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
    int idct_selector[6];

    /* motion vectors */
    VP56mv mv[6];  /* vectors for each block in MB */
    VP56mv vector_candidate[2];
    int vector_candidate_pos;

    /* filtering hints */
    int filter_header;               /* used in vp6 only */
    int deblock_filtering;
    int filter_selection;
    int filter_mode;
    int max_vector_length;
    int sample_variance_threshold;
    DECLARE_ALIGNED(8, int, bounding_values_array)[256];

    uint8_t coeff_ctx[4][64];              /* used in vp5 only */
    uint8_t coeff_ctx_last[4];             /* used in vp5 only */

    int has_alpha;

    /* upside-down flipping hints */
    int flip;  /* are we flipping ? */
    int frbi;  /* first row block index in MB */
    int srbi;  /* second row block index in MB */
    ptrdiff_t stride[4];  /* stride for each plan */

    const uint8_t *vp56_coord_div;
    VP56ParseVectorAdjustment parse_vector_adjustment;
    VP56Filter filter;
    VP56ParseCoeff parse_coeff;
    VP56DefaultModelsInit default_models_init;
    VP56ParseVectorModels parse_vector_models;
    VP56ParseCoeffModels parse_coeff_models;
    VP56ParseHeader parse_header;

    /* for "slice" parallelism between YUV and A */
    VP56Context *alpha_context;

    VP56Model *modelp;
    VP56Model model;

    /* huffman decoding */
    int use_huffman;
    GetBitContext gb;
    VLC dccv_vlc[2];
    VLC runv_vlc[2];
    VLC ract_vlc[2][3][6];
    unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */

    int have_undamaged_frame;
    int discard_frame;
};


int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
                          int flip, int has_alpha);
int ff_vp56_free(AVCodecContext *avctx);
int ff_vp56_free_context(VP56Context *s);
void ff_vp56_init_dequant(VP56Context *s, int quantizer);
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                         AVPacket *avpkt);


/**
 * vp56 specific range coder implementation
 */

extern const uint8_t ff_vp56_norm_shift[256];
int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);

/**
 * vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
 */
static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
{
    if (c->end <= c->buffer && c->bits >= 0)
        c->end_reached ++;
    return c->end_reached > 10;
}

static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
{
    int shift = ff_vp56_norm_shift[c->high];
    int bits = c->bits;
    unsigned int code_word = c->code_word;

    c->high   <<= shift;
    code_word <<= shift;
    bits       += shift;
    if(bits >= 0 && c->buffer < c->end) {
        code_word |= bytestream_get_be16(&c->buffer) << bits;
        bits -= 16;
    }
    c->bits = bits;
    return code_word;
}

#if   ARCH_ARM
#include "arm/vp56_arith.h"
#elif ARCH_X86
#include "x86/vp56_arith.h"
#endif

#ifndef vp56_rac_get_prob
#define vp56_rac_get_prob vp56_rac_get_prob
static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
{
    unsigned int code_word = vp56_rac_renorm(c);
    unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
    unsigned int low_shift = low << 16;
    int bit = code_word >= low_shift;

    c->high = bit ? c->high - low : low;
    c->code_word = bit ? code_word - low_shift : code_word;

    return bit;
}
#endif

#ifndef vp56_rac_get_prob_branchy
// branchy variant, to be used where there's a branch based on the bit decoded
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
{
    unsigned long code_word = vp56_rac_renorm(c);
    unsigned low = 1 + (((c->high - 1) * prob) >> 8);
    unsigned low_shift = low << 16;

    if (code_word >= low_shift) {
        c->high     -= low;
        c->code_word = code_word - low_shift;
        return 1;
    }

    c->high = low;
    c->code_word = code_word;
    return 0;
}
#endif

static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
{
    unsigned int code_word = vp56_rac_renorm(c);
    /* equiprobable */
    int low = (c->high + 1) >> 1;
    unsigned int low_shift = low << 16;
    int bit = code_word >= low_shift;
    if (bit) {
        c->high   -= low;
        code_word -= low_shift;
    } else {
        c->high = low;
    }

    c->code_word = code_word;
    return bit;
}

// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
{
    return vp56_rac_get_prob(c, 128);
}

static int vp56_rac_gets(VP56RangeCoder *c, int bits)
{
    int value = 0;

    while (bits--) {
        value = (value << 1) | vp56_rac_get(c);
    }

    return value;
}

static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
{
    int value = 0;

    while (bits--) {
        value = (value << 1) | vp8_rac_get(c);
    }

    return value;
}

// fixme: add 1 bit to all the calls to this?
static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
{
    int v;

    if (!vp8_rac_get(c))
        return 0;

    v = vp8_rac_get_uint(c, bits);

    if (vp8_rac_get(c))
        v = -v;

    return v;
}

// P(7)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
{
    int v = vp56_rac_gets(c, 7) << 1;
    return v + !v;
}

static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
{
    int v = vp8_rac_get_uint(c, 7) << 1;
    return v + !v;
}

static av_always_inline
int vp56_rac_get_tree(VP56RangeCoder *c,
                      const VP56Tree *tree,
                      const uint8_t *probs)
{
    while (tree->val > 0) {
        if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
            tree += tree->val;
        else
            tree++;
    }
    return -tree->val;
}

// how probabilities are associated with decisions is different I think
// well, the new scheme fits in the old but this way has one fewer branches per decision
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
                                   const uint8_t *probs)
{
    int i = 0;

    do {
        i = tree[i][vp56_rac_get_prob(c, probs[i])];
    } while (i > 0);

    return -i;
}

// DCTextra
static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
{
    int v = 0;

    do {
        v = (v<<1) + vp56_rac_get_prob(c, *prob++);
    } while (*prob);

    return v;
}

#endif /* AVCODEC_VP56_H */


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			/**
22			* @file
23			* VP5 and VP6 compatible video decoder (common features)
24			*/
25
26			#ifndef AVCODEC_VP56_H
27			#define AVCODEC_VP56_H
28
29			#include "libavutil/mem_internal.h"
30
31			#include "avcodec.h"
32			#include "get_bits.h"
33			#include "hpeldsp.h"
34			#include "bytestream.h"
35			#include "h264chroma.h"
36			#include "videodsp.h"
37			#include "vp3dsp.h"
38			#include "vp56dsp.h"
39
40			typedef struct vp56_context VP56Context;
41
42			typedef enum {
43			VP56_FRAME_NONE =-1,
44			VP56_FRAME_CURRENT = 0,
45			VP56_FRAME_PREVIOUS = 1,
46			VP56_FRAME_GOLDEN = 2,
47			VP56_FRAME_GOLDEN2 = 3,
48			} VP56Frame;
49
50			typedef enum {
51			VP56_MB_INTER_NOVEC_PF = 0, /*< Inter MB, no vector, from previous frame /
52			VP56_MB_INTRA = 1, /*< Intra MB /
53			VP56_MB_INTER_DELTA_PF = 2, /*< Inter MB, above/left vector + delta, from previous frame /
54			VP56_MB_INTER_V1_PF = 3, /*< Inter MB, first vector, from previous frame /
55			VP56_MB_INTER_V2_PF = 4, /*< Inter MB, second vector, from previous frame /
56			VP56_MB_INTER_NOVEC_GF = 5, /*< Inter MB, no vector, from golden frame /
57			VP56_MB_INTER_DELTA_GF = 6, /*< Inter MB, above/left vector + delta, from golden frame /
58			VP56_MB_INTER_4V = 7, /*< Inter MB, 4 vectors, from previous frame /
59			VP56_MB_INTER_V1_GF = 8, /*< Inter MB, first vector, from golden frame /
60			VP56_MB_INTER_V2_GF = 9, /*< Inter MB, second vector, from golden frame /
61			} VP56mb;
62
63			typedef struct VP56Tree {
64			int8_t val;
65			int8_t prob_idx;
66			} VP56Tree;
67
68			typedef struct VP56mv {
69			DECLARE_ALIGNED(4, int16_t, x);
70			int16_t y;
71			} VP56mv;
72
73			#define VP56_SIZE_CHANGE 1
74
75			typedef void (VP56ParseVectorAdjustment)(VP56Context s,
76			VP56mv *vect);
77			typedef void (VP56Filter)(VP56Context s, uint8_t dst, uint8_t src,
78			int offset1, int offset2, ptrdiff_t stride,
79			VP56mv mv, int mask, int select, int luma);
80			typedef int (VP56ParseCoeff)(VP56Context s);
81			typedef void (VP56DefaultModelsInit)(VP56Context s);
82			typedef void (VP56ParseVectorModels)(VP56Context s);
83			typedef int (VP56ParseCoeffModels)(VP56Context s);
84			typedef int (VP56ParseHeader)(VP56Context s, const uint8_t *buf,
85			int buf_size);
86
87			typedef struct VP56RangeCoder {
88			int high;
89			int bits; /* stored negated (i.e. negative "bits" is a positive number of
90			bits left) in order to eliminate a negate in cache refilling */
91			const uint8_t *buffer;
92			const uint8_t *end;
93			unsigned int code_word;
94			int end_reached;
95			} VP56RangeCoder;
96
97			typedef struct VP56RefDc {
98			uint8_t not_null_dc;
99			VP56Frame ref_frame;
100			int16_t dc_coeff;
101			} VP56RefDc;
102
103			typedef struct VP56Macroblock {
104			uint8_t type;
105			VP56mv mv;
106			} VP56Macroblock;
107
108			typedef struct VP56Model {
109			uint8_t coeff_reorder[64]; /* used in vp6 only */
110			uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
111			uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
112			uint8_t vector_sig[2]; /* delta sign */
113			uint8_t vector_dct[2]; /* delta coding types */
114			uint8_t vector_pdi[2][2]; /* predefined delta init */
115			uint8_t vector_pdv[2][7]; /* predefined delta values */
116			uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
117			uint8_t coeff_dccv[2][11]; /* DC coeff value */
118			uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
119			uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
120			uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
121			uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
122			uint8_t mb_type[3][10][10]; /* model for decoding MB type */
123			uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
124			} VP56Model;
125
126			struct vp56_context {
127			AVCodecContext *avctx;
128			H264ChromaContext h264chroma;
129			HpelDSPContext hdsp;
130			VideoDSPContext vdsp;
131			VP3DSPContext vp3dsp;
132			VP56DSPContext vp56dsp;
133			uint8_t idct_scantable[64];
134			AVFrame *frames[4];
135			uint8_t *edge_emu_buffer_alloc;
136			uint8_t *edge_emu_buffer;
137			VP56RangeCoder c;
138			VP56RangeCoder cc;
139			VP56RangeCoder *ccp;
140			int sub_version;
141
142			/* frame info */
143			int golden_frame;
144			int plane_width[4];
145			int plane_height[4];
146			int mb_width; /* number of horizontal MB */
147			int mb_height; /* number of vertical MB */
148			int block_offset[6];
149
150			int quantizer;
151			uint16_t dequant_dc;
152			uint16_t dequant_ac;
153
154			/* DC predictors management */
155			VP56RefDc *above_blocks;
156			VP56RefDc left_block[4];
157			int above_block_idx[6];
158			int16_t prev_dc[3][3]; /* [plan][ref_frame] */
159
160			/* blocks / macroblock */
161			VP56mb mb_type;
162			VP56Macroblock *macroblocks;
163			DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
164			int idct_selector[6];
165
166			/* motion vectors */
167			VP56mv mv[6]; /* vectors for each block in MB */
168			VP56mv vector_candidate[2];
169			int vector_candidate_pos;
170
171			/* filtering hints */
172			int filter_header; /* used in vp6 only */
173			int deblock_filtering;
174			int filter_selection;
175			int filter_mode;
176			int max_vector_length;
177			int sample_variance_threshold;
178			DECLARE_ALIGNED(8, int, bounding_values_array)[256];
179
180			uint8_t coeff_ctx[4][64]; /* used in vp5 only */
181			uint8_t coeff_ctx_last[4]; /* used in vp5 only */
182
183			int has_alpha;
184
185			/* upside-down flipping hints */
186			int flip; /* are we flipping ? */
187			int frbi; /* first row block index in MB */
188			int srbi; /* second row block index in MB */
189			ptrdiff_t stride[4]; /* stride for each plan */
190
191			const uint8_t *vp56_coord_div;
192			VP56ParseVectorAdjustment parse_vector_adjustment;
193			VP56Filter filter;
194			VP56ParseCoeff parse_coeff;
195			VP56DefaultModelsInit default_models_init;
196			VP56ParseVectorModels parse_vector_models;
197			VP56ParseCoeffModels parse_coeff_models;
198			VP56ParseHeader parse_header;
199
200			/* for "slice" parallelism between YUV and A */
201			VP56Context *alpha_context;
202
203			VP56Model *modelp;
204			VP56Model model;
205
206			/* huffman decoding */
207			int use_huffman;
208			GetBitContext gb;
209			VLC dccv_vlc[2];
210			VLC runv_vlc[2];
211			VLC ract_vlc[2][3][6];
212			unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
213
214			int have_undamaged_frame;
215			int discard_frame;
216			};
217
218
219			int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
220			int ff_vp56_init_context(AVCodecContext avctx, VP56Context s,
221			int flip, int has_alpha);
222			int ff_vp56_free(AVCodecContext *avctx);
223			int ff_vp56_free_context(VP56Context *s);
224			void ff_vp56_init_dequant(VP56Context *s, int quantizer);
225			int ff_vp56_decode_frame(AVCodecContext avctx, void data, int *got_frame,
226			AVPacket *avpkt);
227
228
229			/**
230			* vp56 specific range coder implementation
231			*/
232
233			extern const uint8_t ff_vp56_norm_shift[256];
234			int ff_vp56_init_range_decoder(VP56RangeCoder c, const uint8_t buf, int buf_size);
235
236			/**
237			* vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
238			*/
239		746181	static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
240			{
241	✓✓✓✓	746181	if (c->end <= c->buffer && c->bits >= 0)
242		11	c->end_reached ++;
243		746181	return c->end_reached > 10;
244			}
245
246		97273225	static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
247			{
248		97273225	int shift = ff_vp56_norm_shift[c->high];
249		97273225	int bits = c->bits;
250		97273225	unsigned int code_word = c->code_word;
251
252		97273225	c->high <<= shift;
253		97273225	code_word <<= shift;
254		97273225	bits += shift;
255	✓✓✓✓	97273225	if(bits >= 0 && c->buffer < c->end) {
256		4198198	code_word \|= bytestream_get_be16(&c->buffer) << bits;
257		4198198	bits -= 16;
258			}
259		97273225	c->bits = bits;
260		97273225	return code_word;
261			}
262
263			#if ARCH_ARM
264			#include "arm/vp56_arith.h"
265			#elif ARCH_X86
266			#include "x86/vp56_arith.h"
267			#endif
268
269			#ifndef vp56_rac_get_prob
270			#define vp56_rac_get_prob vp56_rac_get_prob
271			static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
272			{
273			unsigned int code_word = vp56_rac_renorm(c);
274			unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
275			unsigned int low_shift = low << 16;
276			int bit = code_word >= low_shift;
277
278			c->high = bit ? c->high - low : low;
279			c->code_word = bit ? code_word - low_shift : code_word;
280
281			return bit;
282			}
283			#endif
284
285			#ifndef vp56_rac_get_prob_branchy
286			// branchy variant, to be used where there's a branch based on the bit decoded
287		66664388	static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
288			{
289		66664388	unsigned long code_word = vp56_rac_renorm(c);
290		66664388	unsigned low = 1 + (((c->high - 1) * prob) >> 8);
291		66664388	unsigned low_shift = low << 16;
292
293	✓✓	66664388	if (code_word >= low_shift) {
294		30814739	c->high -= low;
295		30814739	c->code_word = code_word - low_shift;
296		30814739	return 1;
297			}
298
299		35849649	c->high = low;
300		35849649	c->code_word = code_word;
301		35849649	return 0;
302			}
303			#endif
304
305		1303604	static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
306			{
307		1303604	unsigned int code_word = vp56_rac_renorm(c);
308			/* equiprobable */
309		1303604	int low = (c->high + 1) >> 1;
310		1303604	unsigned int low_shift = low << 16;
311		1303604	int bit = code_word >= low_shift;
312	✓✓	1303604	if (bit) {
313		651693	c->high -= low;
314		651693	code_word -= low_shift;
315			} else {
316		651911	c->high = low;
317			}
318
319		1303604	c->code_word = code_word;
320		1303604	return bit;
321			}
322
323			// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
324		10177309	static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
325			{
326		10177309	return vp56_rac_get_prob(c, 128);
327			}
328
329		52237	static int vp56_rac_gets(VP56RangeCoder *c, int bits)
330			{
331		52237	int value = 0;
332
333	✓✓	203495	while (bits--) {
334		151258	value = (value << 1) \| vp56_rac_get(c);
335			}
336
337		52237	return value;
338			}
339
340		48182	static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
341			{
342		48182	int value = 0;
343
344	✓✓	292059	while (bits--) {
345		243877	value = (value << 1) \| vp8_rac_get(c);
346			}
347
348		48182	return value;
349			}
350
351			// fixme: add 1 bit to all the calls to this?
352		6104	static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
353			{
354			int v;
355
356	✓✓	6104	if (!vp8_rac_get(c))
357		5361	return 0;
358
359		743	v = vp8_rac_get_uint(c, bits);
360
361	✓✓	743	if (vp8_rac_get(c))
362		98	v = -v;
363
364		743	return v;
365			}
366
367			// P(7)
368		8496	static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
369			{
370		8496	int v = vp56_rac_gets(c, 7) << 1;
371		8496	return v + !v;
372			}
373
374		306	static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
375			{
376		306	int v = vp8_rac_get_uint(c, 7) << 1;
377		306	return v + !v;
378			}
379
380			static av_always_inline
381		445510	int vp56_rac_get_tree(VP56RangeCoder *c,
382			const VP56Tree *tree,
383			const uint8_t *probs)
384			{
385	✓✓	1764929	while (tree->val > 0) {
386	✓✓	1319419	if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
387		450669	tree += tree->val;
388			else
389		868750	tree++;
390			}
391		445510	return -tree->val;
392			}
393
394			// how probabilities are associated with decisions is different I think
395			// well, the new scheme fits in the old but this way has one fewer branches per decision
396		4225958	static av_always_inline int vp8_rac_get_tree(VP56RangeCoder c, const int8_t (tree)[2],
397			const uint8_t *probs)
398			{
399		4225958	int i = 0;
400
401			do {
402		9419020	i = tree[i][vp56_rac_get_prob(c, probs[i])];
403	✓✓	9419020	} while (i > 0);
404
405		4225958	return -i;
406			}
407
408			// DCTextra
409		43890	static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder c, const uint8_t prob)
410			{
411		43890	int v = 0;
412
413			do {
414		163810	v = (v<<1) + vp56_rac_get_prob(c, *prob++);
415	✓✓	163810	} while (*prob);
416
417		43890	return v;
418			}
419
420			#endif /* AVCODEC_VP56_H */