FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/rangecoder.h	Lines:	54	54	100.0 %
Date:	2020-09-25 23:16:12	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);

/**
 * Check if at the current position there is a valid looking termination
 * @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
 * @returns negative AVERROR code on error or non negative.
 */
int ff_rac_check_termination(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			/**
61			* Check if at the current position there is a valid looking termination
62			* @param version version 0 requires the decoder to know the data size in bytes
63			* version 1 needs about 1 bit more space but does not need to
64			* carry the size from encoder to decoder
65			* @returns negative AVERROR code on error or non negative.
66			*/
67			int ff_rac_check_termination(RangeCoder *c, int version);
68
69			void ff_build_rac_states(RangeCoder *c, int factor, int max_p);
70
71		1362078737	static inline void renorm_encoder(RangeCoder *c)
72			{
73			// FIXME: optimize
74	✓✓	1446355023	while (c->range < 0x100) {
75	✓✓	84276286	if (c->outstanding_byte < 0) {
76		8395	c->outstanding_byte = c->low >> 8;
77	✓✓	84267891	} else if (c->low <= 0xFF00) {
78		55156256	*c->bytestream++ = c->outstanding_byte;
79	✓✓	55678641	for (; c->outstanding_count; c->outstanding_count--)
80		522385	*c->bytestream++ = 0xFF;
81		55156256	c->outstanding_byte = c->low >> 8;
82	✓✓	29111635	} else if (c->low >= 0x10000) {
83		28478363	*c->bytestream++ = c->outstanding_byte + 1;
84	✓✓	28589165	for (; c->outstanding_count; c->outstanding_count--)
85		110802	*c->bytestream++ = 0x00;
86		28478363	c->outstanding_byte = (c->low >> 8) & 0xFF;
87			} else {
88		633272	c->outstanding_count++;
89			}
90
91		84276286	c->low = (c->low & 0xFF) << 8;
92		84276286	c->range <<= 8;
93			}
94		1362078737	}
95
96		1673460	static inline int get_rac_count(RangeCoder *c)
97			{
98		1673460	int x = c->bytestream - c->bytestream_start + c->outstanding_count;
99	✓✓	1673460	if (c->outstanding_byte >= 0)
100		1672998	x++;
101		1673460	return 8 * x - av_log2(c->range);
102			}
103
104		1362063573	static inline void put_rac(RangeCoder c, uint8_t const state, int bit)
105			{
106		1362063573	int range1 = (c->range * (*state)) >> 8;
107
108			av_assert2(*state);
109			av_assert2(range1 < c->range);
110			av_assert2(range1 > 0);
111	✓✓	1362063573	if (!bit) {
112		581766013	c->range -= range1;
113		581766013	state = c->zero_state[state];
114			} else {
115		780297560	c->low += c->range - range1;
116		780297560	c->range = range1;
117		780297560	state = c->one_state[state];
118			}
119
120		1362063573	renorm_encoder(c);
121		1362063573	}
122
123		1371689831	static inline void refill(RangeCoder *c)
124			{
125	✓✓	1371689831	if (c->range < 0x100) {
126		83731125	c->range <<= 8;
127		83731125	c->low <<= 8;
128	✓✓	83731125	if (c->bytestream < c->bytestream_end) {
129		83729463	c->low += c->bytestream[0];
130		83729463	c->bytestream++;
131			} else
132		1662	c->overread ++;
133			}
134		1371689831	}
135
136		1371689831	static inline int get_rac(RangeCoder c, uint8_t const state)
137			{
138		1371689831	int range1 = (c->range * (*state)) >> 8;
139
140		1371689831	c->range -= range1;
141	✓✓	1371689831	if (c->low < c->range) {
142		585236152	state = c->zero_state[state];
143		585236152	refill(c);
144		585236152	return 0;
145			} else {
146		786453679	c->low -= c->range;
147		786453679	state = c->one_state[state];
148		786453679	c->range = range1;
149		786453679	refill(c);
150		786453679	return 1;
151			}
152			}
153
154			#endif /* AVCODEC_RANGECODER_H */