FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/rangecoder.h	Lines:	54	54	100.0 %
Date:	2021-04-14 23:45:22	Branches:	22	22	100.0 %


/*
 * Range coder
 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
 * Range coder.
 */

#ifndef AVCODEC_RANGECODER_H
#define AVCODEC_RANGECODER_H

#include <stdint.h>

#include "libavutil/common.h"
#include "libavutil/avassert.h"

typedef struct RangeCoder {
    int low;
    int range;
    int outstanding_count;
    int outstanding_byte;
    uint8_t zero_state[256];
    uint8_t one_state[256];
    uint8_t *bytestream_start;
    uint8_t *bytestream;
    uint8_t *bytestream_end;
    int overread;
#define MAX_OVERREAD 2
} RangeCoder;

void ff_init_range_encoder(RangeCoder *c, uint8_t *buf, int buf_size);
void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size);

/**
 * Terminates the range coder
 * @param version version 0 requires the decoder to know the data size in bytes
 *                version 1 needs about 1 bit more space but does not need to
 *                          carry the size from encoder to decoder
 */
int ff_rac_terminate(RangeCoder *c, int version);

void ff_build_rac_states(RangeCoder *c, int factor, int max_p);

static inline void renorm_encoder(RangeCoder *c)
{
    // FIXME: optimize
    while (c->range < 0x100) {
        if (c->outstanding_byte < 0) {
            c->outstanding_byte = c->low >> 8;
        } else if (c->low <= 0xFF00) {
            *c->bytestream++ = c->outstanding_byte;
            for (; c->outstanding_count; c->outstanding_count--)
                *c->bytestream++ = 0xFF;
            c->outstanding_byte = c->low >> 8;
        } else if (c->low >= 0x10000) {
            *c->bytestream++ = c->outstanding_byte + 1;
            for (; c->outstanding_count; c->outstanding_count--)
                *c->bytestream++ = 0x00;
            c->outstanding_byte = (c->low >> 8) & 0xFF;
        } else {
            c->outstanding_count++;
        }

        c->low     = (c->low & 0xFF) << 8;
        c->range <<= 8;
    }
}

static inline int get_rac_count(RangeCoder *c)
{
    int x = c->bytestream - c->bytestream_start + c->outstanding_count;
    if (c->outstanding_byte >= 0)
        x++;
    return 8 * x - av_log2(c->range);
}

static inline void put_rac(RangeCoder *c, uint8_t *const state, int bit)
{
    int range1 = (c->range * (*state)) >> 8;

    av_assert2(*state);
    av_assert2(range1 < c->range);
    av_assert2(range1 > 0);
    if (!bit) {
        c->range -= range1;
        *state    = c->zero_state[*state];
    } else {
        c->low  += c->range - range1;
        c->range = range1;
        *state   = c->one_state[*state];
    }

    renorm_encoder(c);
}

static inline void refill(RangeCoder *c)
{
    if (c->range < 0x100) {
        c->range <<= 8;
        c->low   <<= 8;
        if (c->bytestream < c->bytestream_end) {
            c->low += c->bytestream[0];
            c->bytestream++;
        } else
            c->overread ++;
    }
}

static inline int get_rac(RangeCoder *c, uint8_t *const state)
{
    int range1 = (c->range * (*state)) >> 8;

    c->range -= range1;
    if (c->low < c->range) {
        *state = c->zero_state[*state];
        refill(c);
        return 0;
    } else {
        c->low  -= c->range;
        *state   = c->one_state[*state];
        c->range = range1;
        refill(c);
        return 1;
    }
}

#endif /* AVCODEC_RANGECODER_H */


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Range coder
3			* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* Range coder.
25			*/
26
27			#ifndef AVCODEC_RANGECODER_H
28			#define AVCODEC_RANGECODER_H
29
30			#include <stdint.h>
31
32			#include "libavutil/common.h"
33			#include "libavutil/avassert.h"
34
35			typedef struct RangeCoder {
36			int low;
37			int range;
38			int outstanding_count;
39			int outstanding_byte;
40			uint8_t zero_state[256];
41			uint8_t one_state[256];
42			uint8_t *bytestream_start;
43			uint8_t *bytestream;
44			uint8_t *bytestream_end;
45			int overread;
46			#define MAX_OVERREAD 2
47			} RangeCoder;
48
49			void ff_init_range_encoder(RangeCoder c, uint8_t buf, int buf_size);
50			void ff_init_range_decoder(RangeCoder c, const uint8_t buf, int buf_size);
51
52			/**
53			* Terminates the range coder
54			* @param version version 0 requires the decoder to know the data size in bytes
55			* version 1 needs about 1 bit more space but does not need to
56			* carry the size from encoder to decoder
57			*/
58			int ff_rac_terminate(RangeCoder *c, int version);
59
60			void ff_build_rac_states(RangeCoder *c, int factor, int max_p);
61
62		1379318714	static inline void renorm_encoder(RangeCoder *c)
63			{
64			// FIXME: optimize
65	✓✓	1464958117	while (c->range < 0x100) {
66	✓✓	85639403	if (c->outstanding_byte < 0) {
67		8416	c->outstanding_byte = c->low >> 8;
68	✓✓	85630987	} else if (c->low <= 0xFF00) {
69		56057793	*c->bytestream++ = c->outstanding_byte;
70	✓✓	56625412	for (; c->outstanding_count; c->outstanding_count--)
71		567619	*c->bytestream++ = 0xFF;
72		56057793	c->outstanding_byte = c->low >> 8;
73	✓✓	29573194	} else if (c->low >= 0x10000) {
74		28893121	*c->bytestream++ = c->outstanding_byte + 1;
75	✓✓	29005490	for (; c->outstanding_count; c->outstanding_count--)
76		112369	*c->bytestream++ = 0x00;
77		28893121	c->outstanding_byte = (c->low >> 8) & 0xFF;
78			} else {
79		680073	c->outstanding_count++;
80			}
81
82		85639403	c->low = (c->low & 0xFF) << 8;
83		85639403	c->range <<= 8;
84			}
85		1379318714	}
86
87		1673460	static inline int get_rac_count(RangeCoder *c)
88			{
89		1673460	int x = c->bytestream - c->bytestream_start + c->outstanding_count;
90	✓✓	1673460	if (c->outstanding_byte >= 0)
91		1672998	x++;
92		1673460	return 8 * x - av_log2(c->range);
93			}
94
95		1379303508	static inline void put_rac(RangeCoder c, uint8_t const state, int bit)
96			{
97		1379303508	int range1 = (c->range * (*state)) >> 8;
98
99			av_assert2(*state);
100			av_assert2(range1 < c->range);
101			av_assert2(range1 > 0);
102	✓✓	1379303508	if (!bit) {
103		588075310	c->range -= range1;
104		588075310	state = c->zero_state[state];
105			} else {
106		791228198	c->low += c->range - range1;
107		791228198	c->range = range1;
108		791228198	state = c->one_state[state];
109			}
110
111		1379303508	renorm_encoder(c);
112		1379303508	}
113
114		1378588201	static inline void refill(RangeCoder *c)
115			{
116	✓✓	1378588201	if (c->range < 0x100) {
117		84279872	c->range <<= 8;
118		84279872	c->low <<= 8;
119	✓✓	84279872	if (c->bytestream < c->bytestream_end) {
120		84278207	c->low += c->bytestream[0];
121		84278207	c->bytestream++;
122			} else
123		1665	c->overread ++;
124			}
125		1378588201	}
126
127		1378588201	static inline int get_rac(RangeCoder c, uint8_t const state)
128			{
129		1378588201	int range1 = (c->range * (*state)) >> 8;
130
131		1378588201	c->range -= range1;
132	✓✓	1378588201	if (c->low < c->range) {
133		587760183	state = c->zero_state[state];
134		587760183	refill(c);
135		587760183	return 0;
136			} else {
137		790828018	c->low -= c->range;
138		790828018	state = c->one_state[state];
139		790828018	c->range = range1;
140		790828018	refill(c);
141		790828018	return 1;
142			}
143			}
144
145			#endif /* AVCODEC_RANGECODER_H */