FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/rl2.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 74 84 88.1%
Branches: 33 44 75.0%

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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 "codec_internal.h"
38 #include "internal.h"
39
40
41 #define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette
42
43 typedef struct Rl2Context {
44 AVCodecContext *avctx;
45
46 uint16_t video_base; ///< initial drawing offset
47 uint32_t clr_count; ///< number of used colors (currently unused)
48 uint8_t *back_frame; ///< background frame
49 uint32_t palette[AVPALETTE_COUNT];
50 } Rl2Context;
51
52 /**
53 * Run Length Decode a single 320x200 frame
54 * @param s rl2 context
55 * @param in input buffer
56 * @param size input buffer size
57 * @param out output buffer
58 * @param stride stride of the output buffer
59 * @param video_base offset of the rle data inside the frame
60 */
61 110 static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size,
62 uint8_t *out, int stride, int video_base)
63 {
64 110 int base_x = video_base % s->avctx->width;
65 110 int base_y = video_base / s->avctx->width;
66 110 int stride_adj = stride - s->avctx->width;
67 int i;
68 110 const uint8_t *back_frame = s->back_frame;
69 110 const uint8_t *in_end = in + size;
70 110 const uint8_t *out_end = out + stride * s->avctx->height;
71 uint8_t *line_end;
72
73 /** copy start of the background frame */
74
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4000 for (i = 0; i <= base_y; i++) {
75
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3890 if (s->back_frame)
76 3888 memcpy(out, back_frame, s->avctx->width);
77 3890 out += stride;
78 3890 back_frame += s->avctx->width;
79 }
80 110 back_frame += base_x - s->avctx->width;
81 110 line_end = out - stride_adj;
82 110 out += base_x - stride;
83
84 /** decode the variable part of the frame */
85
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1296630 while (in < in_end) {
86 1296630 uint8_t val = *in++;
87 1296630 int len = 1;
88
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1296630 if (val >= 0x80) {
89
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130220 if (in >= in_end)
90 break;
91 130220 len = *in++;
92
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130220 if (!len)
93 break;
94 }
95
96
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1296630 if (len >= out_end - out)
97 110 break;
98
99
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1296520 if (s->back_frame)
100 1244528 val |= 0x80;
101 else
102 51992 val &= ~0x80;
103
104
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105
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5802447 *out++ = (val == 0x80) ? *back_frame : val;
106 5802447 back_frame++;
107
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5802447 if (out == line_end) {
108 18110 out += stride_adj;
109 18110 line_end += stride;
110
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18110 if (len >= out_end - out)
111 break;
112 }
113 }
114 }
115
116 /** copy the rest from the background frame */
117
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110 if (s->back_frame) {
118
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216 while (out < out_end) {
119 108 memcpy(out, back_frame, line_end - out);
120 108 back_frame += line_end - out;
121 108 out = line_end + stride_adj;
122 108 line_end += stride;
123 }
124 }
125 110 }
126
127
128 /**
129 * Initialize the decoder
130 * @param avctx decoder context
131 * @return 0 success, -1 on error
132 */
133 2 static av_cold int rl2_decode_init(AVCodecContext *avctx)
134 {
135 2 Rl2Context *s = avctx->priv_data;
136 int back_size;
137 int i;
138 int ret;
139
140 2 s->avctx = avctx;
141 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
142
143 2 ret = ff_set_dimensions(avctx, 320, 200);
144
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2 if (ret < 0)
145 return ret;
146
147 /** parse extra data */
148
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2 if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
149 av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
150 return AVERROR(EINVAL);
151 }
152
153 /** get frame_offset */
154 2 s->video_base = AV_RL16(&avctx->extradata[0]);
155 2 s->clr_count = AV_RL32(&avctx->extradata[2]);
156
157
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2 if (s->video_base >= avctx->width * avctx->height) {
158 av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
159 return AVERROR_INVALIDDATA;
160 }
161
162 /** initialize palette */
163
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514 for (i = 0; i < AVPALETTE_COUNT; i++)
164 512 s->palette[i] = 0xFFU << 24 | AV_RB24(&avctx->extradata[6 + i * 3]);
165
166 /** decode background frame if present */
167 2 back_size = avctx->extradata_size - EXTRADATA1_SIZE;
168
169
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2 if (back_size > 0) {
170 2 uint8_t *back_frame = av_mallocz(avctx->width*avctx->height);
171
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2 if (!back_frame)
172 return AVERROR(ENOMEM);
173 2 rl2_rle_decode(s, avctx->extradata + EXTRADATA1_SIZE, back_size,
174 back_frame, avctx->width, 0);
175 2 s->back_frame = back_frame;
176 }
177 2 return 0;
178 }
179
180
181 108 static int rl2_decode_frame(AVCodecContext *avctx, AVFrame *frame,
182 int *got_frame, AVPacket *avpkt)
183 {
184 108 const uint8_t *buf = avpkt->data;
185 108 int ret, buf_size = avpkt->size;
186 108 Rl2Context *s = avctx->priv_data;
187
188
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108 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
189 return ret;
190
191 /** run length decode */
192 108 rl2_rle_decode(s, buf, buf_size, frame->data[0], frame->linesize[0],
193 108 s->video_base);
194
195 /** make the palette available on the way out */
196 108 memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
197
198 108 *got_frame = 1;
199
200 /** report that the buffer was completely consumed */
201 108 return buf_size;
202 }
203
204
205 /**
206 * Uninit decoder
207 * @param avctx decoder context
208 * @return 0 success, -1 on error
209 */
210 2 static av_cold int rl2_decode_end(AVCodecContext *avctx)
211 {
212 2 Rl2Context *s = avctx->priv_data;
213
214 2 av_freep(&s->back_frame);
215
216 2 return 0;
217 }
218
219
220 const FFCodec ff_rl2_decoder = {
221 .p.name = "rl2",
222 .p.long_name = NULL_IF_CONFIG_SMALL("RL2 video"),
223 .p.type = AVMEDIA_TYPE_VIDEO,
224 .p.id = AV_CODEC_ID_RL2,
225 .priv_data_size = sizeof(Rl2Context),
226 .init = rl2_decode_init,
227 .close = rl2_decode_end,
228 FF_CODEC_DECODE_CB(rl2_decode_frame),
229 .p.capabilities = AV_CODEC_CAP_DR1,
230 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
231 };
232