FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/rl2.c	Lines:	75	85	88.2 %
Date:	2021-04-14 23:45:22	Branches:	33	44	75.0 %


/*
 * RL2 Video Decoder
 * Copyright (C) 2008 Sascha Sommer (saschasommer@freenet.de)
 *
 * 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
 * RL2 Video Decoder
 * @author Sascha Sommer (saschasommer@freenet.de)
 * @see http://wiki.multimedia.cx/index.php?title=RL2
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "internal.h"


#define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette

typedef struct Rl2Context {
    AVCodecContext *avctx;

    uint16_t video_base;  ///< initial drawing offset
    uint32_t clr_count;   ///< number of used colors (currently unused)
    uint8_t *back_frame;  ///< background frame
    uint32_t palette[AVPALETTE_COUNT];
} Rl2Context;

/**
 * Run Length Decode a single 320x200 frame
 * @param s rl2 context
 * @param in input buffer
 * @param size input buffer size
 * @param out output buffer
 * @param stride stride of the output buffer
 * @param video_base offset of the rle data inside the frame
 */
static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size,
                               uint8_t *out, int stride, int video_base)
{
    int base_x = video_base % s->avctx->width;
    int base_y = video_base / s->avctx->width;
    int stride_adj = stride - s->avctx->width;
    int i;
    const uint8_t *back_frame = s->back_frame;
    const uint8_t *in_end     = in + size;
    const uint8_t *out_end    = out + stride * s->avctx->height;
    uint8_t *line_end;

    /** copy start of the background frame */
    for (i = 0; i <= base_y; i++) {
        if (s->back_frame)
            memcpy(out, back_frame, s->avctx->width);
        out        += stride;
        back_frame += s->avctx->width;
    }
    back_frame += base_x - s->avctx->width;
    line_end    = out - stride_adj;
    out        += base_x - stride;

    /** decode the variable part of the frame */
    while (in < in_end) {
        uint8_t val = *in++;
        int len     = 1;
        if (val >= 0x80) {
            if (in >= in_end)
                break;
            len = *in++;
            if (!len)
                break;
        }

        if (len >= out_end - out)
            break;

        if (s->back_frame)
            val |= 0x80;
        else
            val &= ~0x80;

        while (len--) {
            *out++ = (val == 0x80) ? *back_frame : val;
            back_frame++;
            if (out == line_end) {
                 out      += stride_adj;
                 line_end += stride;
                 if (len >= out_end - out)
                     break;
            }
        }
    }

    /** copy the rest from the background frame */
    if (s->back_frame) {
        while (out < out_end) {
            memcpy(out, back_frame, line_end - out);
            back_frame += line_end - out;
            out         = line_end + stride_adj;
            line_end   += stride;
        }
    }
}


/**
 * Initialize the decoder
 * @param avctx decoder context
 * @return 0 success, -1 on error
 */
static av_cold int rl2_decode_init(AVCodecContext *avctx)
{
    Rl2Context *s = avctx->priv_data;
    int back_size;
    int i;
    int ret;

    s->avctx       = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    ret = ff_set_dimensions(avctx, 320, 200);
    if (ret < 0)
        return ret;

    /** parse extra data */
    if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
        av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
        return AVERROR(EINVAL);
    }

    /** get frame_offset */
    s->video_base = AV_RL16(&avctx->extradata[0]);
    s->clr_count  = AV_RL32(&avctx->extradata[2]);

    if (s->video_base >= avctx->width * avctx->height) {
        av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
        return AVERROR_INVALIDDATA;
    }

    /** initialize palette */
    for (i = 0; i < AVPALETTE_COUNT; i++)
        s->palette[i] = 0xFFU << 24 | AV_RB24(&avctx->extradata[6 + i * 3]);

    /** decode background frame if present */
    back_size = avctx->extradata_size - EXTRADATA1_SIZE;

    if (back_size > 0) {
        uint8_t *back_frame = av_mallocz(avctx->width*avctx->height);
        if (!back_frame)
            return AVERROR(ENOMEM);
        rl2_rle_decode(s, avctx->extradata + EXTRADATA1_SIZE, back_size,
                       back_frame, avctx->width, 0);
        s->back_frame = back_frame;
    }
    return 0;
}


static int rl2_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_frame,
                            AVPacket *avpkt)
{
    AVFrame *frame     = data;
    const uint8_t *buf = avpkt->data;
    int ret, buf_size  = avpkt->size;
    Rl2Context *s = avctx->priv_data;

    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

    /** run length decode */
    rl2_rle_decode(s, buf, buf_size, frame->data[0], frame->linesize[0],
                   s->video_base);

    /** make the palette available on the way out */
    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);

    *got_frame = 1;

    /** report that the buffer was completely consumed */
    return buf_size;
}


/**
 * Uninit decoder
 * @param avctx decoder context
 * @return 0 success, -1 on error
 */
static av_cold int rl2_decode_end(AVCodecContext *avctx)
{
    Rl2Context *s = avctx->priv_data;

    av_freep(&s->back_frame);

    return 0;
}


AVCodec ff_rl2_decoder = {
    .name           = "rl2",
    .long_name      = NULL_IF_CONFIG_SMALL("RL2 video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_RL2,
    .priv_data_size = sizeof(Rl2Context),
    .init           = rl2_decode_init,
    .close          = rl2_decode_end,
    .decode         = rl2_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* RL2 Video Decoder
3			* Copyright (C) 2008 Sascha Sommer (saschasommer@freenet.de)
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			* RL2 Video Decoder
25			* @author Sascha Sommer (saschasommer@freenet.de)
26			* @see http://wiki.multimedia.cx/index.php?title=RL2
27			*/
28
29			#include <stdio.h>
30			#include <stdlib.h>
31			#include <string.h>
32
33			#include "libavutil/internal.h"
34			#include "libavutil/intreadwrite.h"
35			#include "libavutil/mem.h"
36			#include "avcodec.h"
37			#include "internal.h"
38
39
40			#define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette
41
42			typedef struct Rl2Context {
43			AVCodecContext *avctx;
44
45			uint16_t video_base; ///< initial drawing offset
46			uint32_t clr_count; ///< number of used colors (currently unused)
47			uint8_t *back_frame; ///< background frame
48			uint32_t palette[AVPALETTE_COUNT];
49			} Rl2Context;
50
51			/**
52			* Run Length Decode a single 320x200 frame
53			* @param s rl2 context
54			* @param in input buffer
55			* @param size input buffer size
56			* @param out output buffer
57			* @param stride stride of the output buffer
58			* @param video_base offset of the rle data inside the frame
59			*/
60		110	static void rl2_rle_decode(Rl2Context s, const uint8_t in, int size,
61			uint8_t *out, int stride, int video_base)
62			{
63		110	int base_x = video_base % s->avctx->width;
64		110	int base_y = video_base / s->avctx->width;
65		110	int stride_adj = stride - s->avctx->width;
66			int i;
67		110	const uint8_t *back_frame = s->back_frame;
68		110	const uint8_t *in_end = in + size;
69		110	const uint8_t out_end = out + stride s->avctx->height;
70			uint8_t *line_end;
71
72			/** copy start of the background frame */
73	✓✓	4000	for (i = 0; i <= base_y; i++) {
74	✓✓	3890	if (s->back_frame)
75		3888	memcpy(out, back_frame, s->avctx->width);
76		3890	out += stride;
77		3890	back_frame += s->avctx->width;
78			}
79		110	back_frame += base_x - s->avctx->width;
80		110	line_end = out - stride_adj;
81		110	out += base_x - stride;
82
83			/** decode the variable part of the frame */
84	✓✗	1296630	while (in < in_end) {
85		1296630	uint8_t val = *in++;
86		1296630	int len = 1;
87	✓✓	1296630	if (val >= 0x80) {
88	✗✓	130220	if (in >= in_end)
89			break;
90		130220	len = *in++;
91	✗✓	130220	if (!len)
92			break;
93			}
94
95	✓✓	1296630	if (len >= out_end - out)
96		110	break;
97
98	✓✓	1296520	if (s->back_frame)
99		1244528	val \|= 0x80;
100			else
101		51992	val &= ~0x80;
102
103	✓✓	7098967	while (len--) {
104	✓✓	5802447	out++ = (val == 0x80) ? back_frame : val;
105		5802447	back_frame++;
106	✓✓	5802447	if (out == line_end) {
107		18110	out += stride_adj;
108		18110	line_end += stride;
109	✗✓	18110	if (len >= out_end - out)
110			break;
111			}
112			}
113			}
114
115			/** copy the rest from the background frame */
116	✓✓	110	if (s->back_frame) {
117	✓✓	216	while (out < out_end) {
118		108	memcpy(out, back_frame, line_end - out);
119		108	back_frame += line_end - out;
120		108	out = line_end + stride_adj;
121		108	line_end += stride;
122			}
123			}
124		110	}
125
126
127			/**
128			* Initialize the decoder
129			* @param avctx decoder context
130			* @return 0 success, -1 on error
131			*/
132		2	static av_cold int rl2_decode_init(AVCodecContext *avctx)
133			{
134		2	Rl2Context *s = avctx->priv_data;
135			int back_size;
136			int i;
137			int ret;
138
139		2	s->avctx = avctx;
140		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
141
142		2	ret = ff_set_dimensions(avctx, 320, 200);
143	✗✓	2	if (ret < 0)
144			return ret;
145
146			/** parse extra data */
147	✓✗✗✓	2	if (!avctx->extradata \|\| avctx->extradata_size < EXTRADATA1_SIZE) {
148			av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
149			return AVERROR(EINVAL);
150			}
151
152			/** get frame_offset */
153		2	s->video_base = AV_RL16(&avctx->extradata[0]);
154		2	s->clr_count = AV_RL32(&avctx->extradata[2]);
155
156	✗✓	2	if (s->video_base >= avctx->width * avctx->height) {
157			av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
158			return AVERROR_INVALIDDATA;
159			}
160
161			/** initialize palette */
162	✓✓	514	for (i = 0; i < AVPALETTE_COUNT; i++)
163		512	s->palette[i] = 0xFFU << 24 \| AV_RB24(&avctx->extradata[6 + i * 3]);
164
165			/** decode background frame if present */
166		2	back_size = avctx->extradata_size - EXTRADATA1_SIZE;
167
168	✓✗	2	if (back_size > 0) {
169		2	uint8_t back_frame = av_mallocz(avctx->widthavctx->height);
170	✗✓	2	if (!back_frame)
171			return AVERROR(ENOMEM);
172		2	rl2_rle_decode(s, avctx->extradata + EXTRADATA1_SIZE, back_size,
173			back_frame, avctx->width, 0);
174		2	s->back_frame = back_frame;
175			}
176		2	return 0;
177			}
178
179
180		108	static int rl2_decode_frame(AVCodecContext *avctx,
181			void data, int got_frame,
182			AVPacket *avpkt)
183			{
184		108	AVFrame *frame = data;
185		108	const uint8_t *buf = avpkt->data;
186		108	int ret, buf_size = avpkt->size;
187		108	Rl2Context *s = avctx->priv_data;
188
189	✗✓	108	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
190			return ret;
191
192			/** run length decode */
193		108	rl2_rle_decode(s, buf, buf_size, frame->data[0], frame->linesize[0],
194		108	s->video_base);
195
196			/** make the palette available on the way out */
197		108	memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
198
199		108	*got_frame = 1;
200
201			/** report that the buffer was completely consumed */
202		108	return buf_size;
203			}
204
205
206			/**
207			* Uninit decoder
208			* @param avctx decoder context
209			* @return 0 success, -1 on error
210			*/
211		2	static av_cold int rl2_decode_end(AVCodecContext *avctx)
212			{
213		2	Rl2Context *s = avctx->priv_data;
214
215		2	av_freep(&s->back_frame);
216
217		2	return 0;
218			}
219
220
221			AVCodec ff_rl2_decoder = {
222			.name = "rl2",
223			.long_name = NULL_IF_CONFIG_SMALL("RL2 video"),
224			.type = AVMEDIA_TYPE_VIDEO,
225			.id = AV_CODEC_ID_RL2,
226			.priv_data_size = sizeof(Rl2Context),
227			.init = rl2_decode_init,
228			.close = rl2_decode_end,
229			.decode = rl2_decode_frame,
230			.capabilities = AV_CODEC_CAP_DR1,
231			};